Patent Description:
A motor controls rotation by including a rotation position detection circuit that detects the rotation position of a rotor. It is important that a substrate on which a rotation position detection circuit is mounted has a constant positional relationship with a stator. It is available that a motor in which a substrate on which a rotation position detection circuit is mounted is fixed to a stator (see PTL <NUM>).

When a motor is used in an environment where there is charged dust, etc., a substrate on which a rotation position detection circuit is mounted may be replaced in order to suppress the influence of the environment. When the substrate is fixed to the stator as disclosed in PTL <NUM>, it is necessary to disassemble the motor so that the attachment position of the substrate is exposed when replacing the substrate, which causes a problem that the replacement work is complicated. <CIT> relates to an example of a motor and discloses subject-matter according to the preamble of claim <NUM>.

An object of the invention is to provide a motor in which a substrate can be easily replaced.

Another object of the invention is to provide a structure of an air compressor using a motor, in which a substrate can be easily replaced.

According to an aspect of the invention, there is provided a motor according to claim <NUM>, in particular including: a central shaft extending in an axial direction; a stator extending in the axial direction around the central shaft; a rotor facing an outer side in a radial direction of the stator and configured to rotate around the central shaft; a substrate which is located on one side in the axial direction with respect to the rotor and on which a rotation position detection circuit configured to detect a rotation position of the rotor is mounted; and a case located on one side in the axial direction with respect to the substrate and configured to support the stator, wherein the case includes a fixing portion configured to fix the substrate, and the substrate includes a fixed portion fixed to the fixing portion, wherein the fixing portion and the fixed portion are located on an outer side in the radial direction with respect to the rotor.

According to another aspect of the invention, there is provided an air compressor according to claim <NUM>, in particular including: a motor according to claim <NUM>, a compression mechanism configured to be driven by the motor; and a crankcase in which a part of the compression mechanism is incorporated, wherein the crankcase includes the fixing portion configured to fix the substrate.

According to an aspect of the invention, it is possible to provide the motor in which the substrate can be easily replaced.

According to another aspect of the invention, it is possible to provide the structure of the air compressor using the motor, in which the substrate can be easily replaced.

Hereinafter, a motor and an air compressor according to an embodiment of the invention will be described with reference to the drawings. Meanwhile, in the following drawings, in order to make each configuration easy to understand, the scale and number and the like in each structure may be different from those in the actual structure.

Further, in the drawings, the XYZ coordinate system is shown as a three-dimensional Cartesian coordinate system as appropriate. In the XYZ coordinate system, the Y-axis direction is defined as a direction parallel to an axial direction of a central axis J shown in <FIG>. The Z-axis direction is defined as an upper and lower direction of <FIG> in a radial direction with respect to the central axis J. The X-axis direction is defined as a direction orthogonal to both the Z-axis direction and the Y-axis direction. In any of the X-axis direction, the Y-axis direction, and the Z-axis direction, the side pointed by the arrow shown in the drawing is defined as the + side, and the opposite side is defined as the - side.

Further, in the following description, the positive side (+Y side) in the Y-axis direction is referred to as the "front side" or "one side," and the negative side (-Y side) in the Y-axis direction is referred to as the "rear side" or "the other side. " Meanwhile, the rear side (the other side) and the front side (one side) are names used only for explanation and do not limit the actual positional relationship and direction. Further, unless otherwise noted, the direction (Y-axis direction) parallel to the central axis J is simply referred to as the "axial direction," the radial direction centered on the central axis J is simply referred to as the "radial direction," and the circumferential direction centered on the central axis J, that is, the circumference (θ-direction) of the central axis J is simply referred to as the "circumferential direction. " In the radial direction, the side approaching the central axis J is referred to as the "inner side in the radial direction," and the side away from the central axis J is referred to as the "outer side in the radial direction. " In the circumferential direction, the side pointed by the arrow shown in the drawing is defined as the + side, and the opposite side is defined as the - side. The positive side (+θ side) in the circumferential direction is referred to as "one side," and the negative side (-θ side) in the circumferential direction is referred to as "the other side.

Meanwhile, as used herein, the phrase "extending in the axial direction" includes not only the case of extending strictly in the axial direction (Z-axis direction), but also the case of extending in a direction inclined in a range of less than <NUM>° with respect to the axial direction. Further, as used herein, the phrase "extending in the radial direction" includes not only the case of extending strictly in the radial direction, that is, in a direction perpendicular to the axial direction (Z-axis direction), but also the case of extending in a direction inclined in a range of less than <NUM>° with respect to the radial direction. Further, the phrase "being parallel" includes not only the case of being strictly parallel, but also the case where the angle formed by each other is inclined in a range of less than <NUM>°.

<FIG> is a perspective view showing a motor <NUM> according to a first embodiment of the invention, in which a winding is not shown.

<FIG> is a rear perspective view of the motor <NUM> shown in <FIG>, as viewed from the +Y side.

The motor <NUM> includes a shaft <NUM> extending in the axial direction, a stator <NUM>, a rotor <NUM>, a substrate <NUM>, and a case <NUM>. The motor <NUM> is an outer rotor type motor in which the rotor <NUM> is arranged on the outer side in the radial direction of the stator <NUM>.

The rotor <NUM> includes a magnet holder <NUM> on one side in the axial direction. The rotor <NUM> includes a rotor plate <NUM> on the other side in the axial direction. The rotor plate <NUM> is made of a non-magnetic material, and is, for example, an aluminum die-cast part. The rotor plate <NUM> has a through-hole <NUM> that penetrates in the axial direction. Ten through-holes <NUM> are provided at equal intervals in the circumferential direction.

Hall ICs <NUM>, <NUM>, and <NUM> (see <FIG>) and a connector <NUM> are mounted on the substrate <NUM>. The Hall ICs <NUM>, <NUM>, and <NUM> are examples of rotation position detection circuits that detect the rotation position of the rotor <NUM>. The connector <NUM> has a terminal capable of externally outputting the signal detected by the Hall ICs <NUM>, <NUM>, and <NUM>. The substrate <NUM> has through-holes <NUM>, <NUM>, and <NUM> that penetrate in the axial direction.

The case <NUM> is located on one side in the axial direction with respect to the substrate <NUM>. The case <NUM> supports the stator <NUM>. The case <NUM> may not directly support the stator <NUM>. The substrate <NUM> is fixed to the case <NUM> by being screwed into screw holes <NUM>, <NUM>, and <NUM> of the case <NUM> through the through-hole <NUM>, <NUM>, and <NUM>. The screw holes <NUM>, <NUM>, and <NUM> of the case <NUM> extend from one end in the axial direction to the other side in the axial direction. The screw holes <NUM>, <NUM>, and <NUM> of the case <NUM> are examples of fixing portions. The through-holes <NUM>, <NUM>, and <NUM> of the substrate <NUM> are examples of fixed portions. Three or more fixing portions and fixed portions are provided. Since the substrate <NUM> is fixed to the case <NUM> instead of being fixed to the stator <NUM>, the substrate <NUM> can be easily retrofitted and replaced.

The through-holes <NUM>, <NUM>, and <NUM> of the substrate <NUM> are located on the outer side in the radial direction with respect to the rotor <NUM>. That is, the fixing portions and the fixed portions are located on the outer side in the radial direction with respect to the rotor <NUM>. In this way, the substrate <NUM> can be easily fixed and removed.

<FIG> is a side view of the motor <NUM> shown in <FIG>, as viewed from the +X side.

<FIG> is a side sectional view showing the motor <NUM> shown in <FIG>, taken along a plane orthogonal to the X-axis and passing through the central axis J.

In <FIG> and <FIG>, the parts mounted on the substrate <NUM> are not shown.

The shaft <NUM> extends along the central axis J. The stator <NUM> extends in the axial direction about the central axis J. The rotor <NUM> faces the stator <NUM> on the outer side in the radial direction and rotates about the shaft <NUM>. The rotor <NUM> includes the magnet holder <NUM>, a rotor core <NUM>, and the rotor plate <NUM> in this order from one side in the axial direction to the other side in the axial direction. The magnet holder <NUM> has a through-hole <NUM> that penetrates in the axial direction. Ten through-holes <NUM> are provided at equal intervals in the circumferential direction. The rotor core <NUM> has a through-hole <NUM> that penetrates in the axial direction. Ten through-holes <NUM> are provided at equal intervals in the circumferential direction. The rotor plate <NUM>, the rotor core <NUM>, and the magnet holder <NUM> are fixed by bolts or the like that penetrate the through-holes <NUM>, <NUM>, and <NUM>. That is, the rotor core <NUM> is fitted with the rotor plate <NUM>.

The rotor plate <NUM> includes a cylindrical portion <NUM> having a cylindrical hole that penetrates in the axial direction. The center of the cylindrical portion <NUM> is arranged along the central axis J. The shaft <NUM> penetrates the cylindrical hole of the cylindrical portion <NUM>. The motor <NUM> includes a rotor bush <NUM> between an outer peripheral surface of the shaft <NUM> and an inner peripheral surface of the cylindrical portion <NUM>. The shaft <NUM> is fixed to the rotor plate <NUM> via the rotor bush <NUM>. That is, the rotor plate <NUM> is fitted with the shaft <NUM>.

The case <NUM> has a through-hole <NUM> that penetrates in the axial direction. The case <NUM> has bearings <NUM> and <NUM> in the through-hole <NUM>. The bearing <NUM> is arranged on one side in the axial direction with respect to the bearing <NUM>. Outer peripheral surfaces of inner races of the bearings <NUM> and <NUM> are fixed to the case <NUM> in the through-hole <NUM>. The shaft <NUM> is fixed to inner peripheral surfaces of inner races of the bearings <NUM> and <NUM>. The shaft <NUM> is supported to be rotatable about the central axis J by the bearings <NUM> and <NUM>.

<FIG> is a perspective view showing a state in which the rotor plate <NUM> is removed from <FIG>.

The rotor core <NUM> is an annular member extending in the axial direction. The rotor core <NUM> is composed of, for example, a laminated steel plate formed by laminating electromagnetic steel plates in the axial direction. The rotor core <NUM> has, on the inner peripheral surface thereof, a side wall portion <NUM> protruding inward in the radial direction and extending in the axial direction. Ten side wall portions <NUM> are provided at equal intervals in the circumferential direction. The rotor <NUM> includes a rotor magnet <NUM>. The rotor magnet <NUM> is a rectangular parallelepiped. The rotor magnet <NUM> is fixed between the side wall portion <NUM> and the side wall portion <NUM> adjacent to the side wall portion <NUM>. Ten rotor magnets <NUM> are provided at equal intervals in the circumferential direction. The rotor magnets <NUM> face the stator <NUM> on the inner side in the radial direction.

<FIG> is a front view showing a state in which the rotor plate <NUM> is removed from the motor <NUM> shown in <FIG>, as viewed from the -Y side.

The inner surface in the radial direction of the rotor magnet <NUM> radially faces a claw portion <NUM> of the magnet holder <NUM>. The one side surface in the axial direction of the rotor magnet <NUM> axially faces the claw portion <NUM> of the magnet holder <NUM>. In this way, the claw portion <NUM> restricts the movement of the rotor magnet <NUM> toward one side in the axial direction and inward in the radial direction. The claw portion <NUM> is an example of a holder claw portion.

<FIG> is a rear view showing a state in which the case <NUM>, the substrate <NUM>, and the magnet holders <NUM> are removed from the motor <NUM> shown in <FIG>, as viewed from the +Y side. The inner surface in the radial direction of the rotor magnet <NUM> radially faces a claw portion <NUM> of the rotor plate <NUM>. In this way, the claw portion <NUM> restricts the movement of the rotor magnet <NUM> inward in the radial direction. The claw portion <NUM> is an example of a plate claw portion. The other side surface in the axial direction of the rotor magnet <NUM> radially faces the rotor plate <NUM>. In this way, the rotor plate <NUM> restricts the movement of the rotor magnet <NUM> toward the other side in the axial direction.

<FIG> is a perspective view showing a state in which the rotor core <NUM> and the rotor magnets <NUM> are removed from <FIG>.

The stator <NUM> includes a stator core <NUM>. The stator core <NUM> has twelve slots for accommodating the windings of the stator <NUM>. The stator core <NUM> is composed of, for example, a laminated steel plate formed by laminating electromagnetic steel plates in the axial direction. The stator <NUM> includes an insulator <NUM> that covers the stator core <NUM> from the other side in the axial direction. The stator <NUM> includes an insulator <NUM> that covers the stator core <NUM> from one side in the axial direction. The insulators <NUM> and <NUM> are fixed to the stator core <NUM>.

The magnet holder <NUM> is a member arranged on one side in the axial direction of the rotor core <NUM> and the rotor magnet <NUM>. The magnet holder <NUM> is an annular member having a flat plate surface in the axial direction and making one revolution in the circumferential direction. The magnet holder <NUM> is made of, for example, a non-magnetic material such as aluminum. Since the magnet holder <NUM> is made of a non-magnetic material, it does not affect the magnetic field generated by the rotor magnet <NUM>. The axial thickness of the magnet holder <NUM> is thicker than the axial thickness of one of the electromagnetic steel plates constituting the rotor core <NUM>. In this way, the strength of the magnet holder <NUM> can be secured.

<FIG> is a perspective view showing a state in which the magnet holder <NUM> is removed from <FIG>.

The insulator <NUM> has, on the outer peripheral side thereof, thin-walled portions 230a, 230b, and 230c having a thin radial thickness. The thin-walled portion 230a has a convex portion <NUM> on the outer surface in the radial direction thereof. The thin-walled portion 230b has a convex portion <NUM> on the outer surface in the radial direction thereof. The thin-walled portion 230c has a convex portion <NUM> the outer surface in the radial direction thereof. The convex portions <NUM>, <NUM>, and <NUM> protrude outward in the radial direction and extend in the axial direction.

The substrate <NUM> has concave portions <NUM>, <NUM>, and <NUM> having shapes corresponding to the convex portions <NUM>, <NUM>, and <NUM> at positions corresponding to the convex portions <NUM>, <NUM>, and <NUM>. The concave portions <NUM>, <NUM>, and <NUM> are recessed outward in the radial direction from the inner peripheral surface of the substrate <NUM>.

The convex portions <NUM>, <NUM>, and <NUM> are fitted into the concave portions <NUM>, <NUM>, and <NUM> to restrict the position in the circumferential direction of the substrate <NUM>. The shapes of the convex portions <NUM>, <NUM>, and <NUM>, and the concave portions <NUM>, <NUM>, and <NUM> as viewed from the axial direction may be any shape such as a circle or a square as long as it can restrict the position in the circumferential direction of the substrate <NUM>. The convex portions <NUM>, <NUM>, and <NUM> are examples of restricting portions. The concave portions <NUM>, <NUM>, and <NUM> are examples of restricted portions. A concave portion provided on the outer peripheral surface of the insulator <NUM> may be used as the restricting portion, and a convex portion provided on the substrate <NUM> may be used as the restricted portion. When the convex portions <NUM>, <NUM>, and <NUM> provided on the thin-walled portions 230a, 230b, and 230c are used as the restricting portions as in the present embodiment, the convex portions <NUM>, <NUM>, and <NUM> can serve as reinforcing ribs for the thin-walled portions 230a, 230b, and 230c, and can suppress the deformation in the radial direction of the insulator <NUM>. The deformation in the radial direction of the insulator <NUM> causes the position of the substrate <NUM> to be shifted.

<FIG> is a front view of the substrate <NUM>, as viewed from the -Y side.

The Hall ICs <NUM>, <NUM>, and <NUM> are mounted at intervals of <NUM> degrees in the circumferential direction on the substrate <NUM>. The substrate <NUM> has a length of <NUM> degrees in the circumferential direction.

The concave portions <NUM>, <NUM>, and <NUM> of the substrate <NUM> have a semicircular shape as viewed from the axial direction. Of the concave portions <NUM>, <NUM>, and <NUM>, the concave portion <NUM> is the concave portion on the one end side in the circumferential direction. Of the concave portions <NUM>, <NUM>, and <NUM>, the concave portion <NUM> is the concave portion on the other end side in the circumferential direction. A line A, which is a tangent line to one side surface in the circumferential direction of the concave portion <NUM>, is parallel to a line B, which is a tangent line to the other side surface in the circumferential direction of the concave portion <NUM>. In this way, when retrofitting the substrate <NUM>, the convex portions <NUM>, <NUM>, and <NUM> can be smoothly fitted into the concave portions <NUM>, <NUM>, and <NUM>, and the substrate <NUM> can be easily retrofitted. The convex portions <NUM>, <NUM>, and <NUM> may have a triangular shape as viewed from the axial direction. The convex portions <NUM>, <NUM>, and <NUM> may have a trapezoidal shape as viewed from the axial direction.

The concave portions <NUM>, <NUM>, and <NUM> are located in a triangle C that is a polygon having the through-holes <NUM>, <NUM>, and <NUM> of the substrate <NUM> as vertices. In this way, the positional deviation in the circumferential direction of the substrate <NUM> can be reduced. The triangle C is an example of a polygon having a fixing portion and a fixed portion as vertices.

In the present embodiment, a lead wire from the winding of the stator <NUM> is not connected to the substrate <NUM>. Therefore, the substrate <NUM> does not have a power line for driving the motor <NUM>. On the substrate <NUM>, a Hall signal component connected to a motor drive control IC is arranged, and there is no motor drive control IC or the like. Therefore, the substrate <NUM> can be easily retrofitted and replaced.

<FIG> is a rear perspective view showing a state in which the shaft <NUM>, the case <NUM>, and the substrate <NUM> are removed from <FIG>.

Ten claw portions <NUM> of the magnet holder <NUM> are provided at equal intervals in the circumferential direction.

The inner surface in the radial direction of the rotor magnet <NUM> is a flat surface. The claw portion <NUM> is located at an end portion in the circumferential direction of the rotor magnet <NUM>. Since the inner surface in the radial direction of the rotor magnet <NUM> is a flat surface, a gap between the rotor magnet <NUM> and the stator <NUM> is larger at the end portion than at the center portion in the circumferential direction of the rotor magnet <NUM>. When the claw portion <NUM> is provided at the end portion in the circumferential direction of such a rotor magnet <NUM>, the claw portion <NUM> does not interfere with the rotation of the motor <NUM> and can reliably hold the rotor magnet <NUM>.

One claw portion <NUM> of the plurality of claw portions <NUM> holds ends in the circumferential direction of both of two adjacent rotor magnets <NUM> of the plurality of rotor magnets <NUM>. Since one claw portion <NUM> holds both of the adjacent rotor magnets <NUM>, the length in the circumferential direction of the claw portion <NUM> can be increased, and the strength of the claw portion <NUM> can be increased. The rotor magnets <NUM> adjacent to each other in the circumferential direction have different poles from each other. Therefore, when the rotor magnets <NUM> face the stator <NUM>, a force outward in the radial direction acts on the other of the rotor magnets <NUM> when a force inward in the radial direction acts on one of the rotor magnets <NUM>. Therefore, one claw portion <NUM> that holds the ends in the circumferential direction of both of the adjacent rotor magnets <NUM> needs only be able to support one of the rotor magnets <NUM>.

One claw portion <NUM> of the plurality of claw portions <NUM> is located at one end in the circumferential direction of the rotor magnet <NUM>, and another claw portion <NUM> adjacent to the one claw portion <NUM> is located at the other end in the circumferential direction of the same rotor magnet <NUM>. Since one claw portion <NUM> and another claw portion <NUM> adjacent to the one claw portion <NUM> hold both ends in the circumferential direction of the rotor magnet <NUM>, it is possible to further prevent the rotor magnet <NUM> from falling off inward in the radial direction.

The claw portion <NUM> has a first claw portion 332a extending inward in the radial direction from an inner peripheral portion of the magnet holder <NUM>, and a second claw portion 332c extending toward the other side in the axial direction from the first claw portion 332a. In the claw portion <NUM>, a bent portion 332b is formed when the first claw portion 332a is bent to the second claw portion 332c. The first claw portion 332a faces one side in the axial direction of the rotor magnet <NUM>. In this way, the first claw portion 332a restricts the movement of the rotor magnet <NUM> toward one side in the axial direction. The second claw portion 332c faces the inner side in the radial direction of the rotor magnet <NUM>. In this way, the second claw portion 332c restricts the movement of the rotor magnet <NUM> inward in the radial direction of the rotor magnet <NUM>. The radial thickness of the second claw portion 332c is thicker than the axial thickness of one of the electromagnetic steel plates constituting the rotor core <NUM>. In this way, the strength of the second claw portion 332c can be secured.

The magnet holder <NUM> holds the rotor magnets <NUM> via an adhesive. In this way, the adhesive can absorb the dimensional tolerance between the magnet holder <NUM> and the rotor magnet <NUM>. In particular, the laminated steel plates constituting the rotor core <NUM> have a large dimensional tolerance, and a structure for absorbing the dimensional differences is required.

The second claw portion 332c holds the rotor magnets <NUM> via an adhesive. In this way, the distance between the second claw portion 332c and the rotor magnet <NUM> can be adjusted with the adhesive. Therefore, even when the curvature of the bent portion 332b between the first claw portion 332a and the second claw portion 332c of the claw portion <NUM> is small (R is gentle), the rotor magnet can be held without the interference between the claw portion <NUM> and the rotor magnet <NUM> (while the rotor magnet <NUM> is not affected by the curved surface of the bent portion 332b).

<FIG> is a rear perspective view of the rotor core <NUM>.

The rotor core <NUM> has a flat surface portion <NUM> between the side wall portion <NUM> and the side wall portion <NUM> adjacent to the side wall portion <NUM>. The flat surface portion <NUM> is the inner surface in the radial direction of the rotor core <NUM>. The outer surface in the radial direction of the rotor magnet <NUM> is fixed to the flat surface portion <NUM> via an adhesive. That is, the rotor core <NUM> has an accommodating portion <NUM> formed by the side wall portion <NUM>, the side wall portion <NUM> adjacent to the side wall portion <NUM>, and the flat surface portion <NUM> between the side wall portions <NUM>. The accommodating portion <NUM> is recessed outward in the radial direction on the inner side in the radial direction of the rotor core <NUM>. The accommodating portion <NUM> accommodates the rotor magnet <NUM>.

<FIG> is a rear perspective view of the rotor plate <NUM>.

On the inner peripheral side of the rotor core <NUM>, the rotor plate <NUM> has the claw portion <NUM> extending to one side in the axial direction from the other end in the axial direction of the rotor core <NUM>. Ten claw portions <NUM> of the rotor plate <NUM> are provided at equal intervals in the circumferential direction. The claw portion <NUM> is provided at a position corresponding to the position in the circumferential direction of the claw portion <NUM> of the magnet holder <NUM>. The claw portion <NUM> holds the rotor magnet <NUM> via an adhesive.

The length in the circumferential direction of the claw portion <NUM> facing the inner surface in the radial direction of the rotor magnet <NUM> is shorter than the length in the circumferential direction of the claw portion <NUM> facing the inner surface in the radial direction of the rotor magnet <NUM>. In the facing surface between the claw portion <NUM> and the rotor magnet <NUM>, the length in the circumferential direction is longer than the length in the axial direction. In the facing surface between the claw portion <NUM> and the rotor magnet <NUM>, the length in the circumferential direction is shorter than the length in the axial direction.

The claw portion <NUM> holds the inner surface in the radial direction of the rotor magnet <NUM> mainly over the length in the circumferential direction. When the rotor plate <NUM> is an aluminum die-cast part, the rotor plate is easily bent when the claw portion <NUM> is long in the axial direction. Therefore, when the claw portion <NUM> is short in the axial direction and long in the circumferential direction, a large contact area between the claw portion <NUM> and the rotor magnet <NUM> can be secured, and the holding force can be increased. The claw portion <NUM> holds the inner surface in the radial direction of the rotor magnet <NUM> mainly over the length in the axial direction. When the magnet holder <NUM> is an aluminum plate, the magnet holder is easily bent in the axial direction when the claw portion <NUM> is long in the axial direction and short in the circumferential direction at the time of forming the claw portion <NUM>. Further, when the claw portion <NUM> is long in the axial direction and short in the circumferential direction, a large contact area between the claw portion <NUM> and the rotor magnet <NUM> can be secured, and the holding force can be increased.

Next, the operation and effect of the motor <NUM> will be described.

The invention according to the above-described embodiment provides a motor including a central shaft extending in an axial direction; a stator extending in the axial direction around the central shaft; a rotor facing the outer side in a radial direction of the stator and configured to rotate around the central shaft; a substrate which is located on one side in the axial direction with respect to the rotor and on which a rotation position detection circuit that detects the rotation position of the rotor is mounted; and a case located on one side in the axial direction with respect to the substrate and configured to support the stator. The stator has a restricting portion configured to restrict the position in a circumferential direction of the substrate, the case has a fixing portion configured to fix the substrate, and the substrate has a restricted portion whose position in the circumferential direction is restricted by the restricting portion, and a fixed portion fixed to the fixing portion.

Since the substrate is fixed to the case, the substrate can be easily retrofitted and replaced.

Further, the rotation position detection circuit has a Hall IC, and a connector configured to connect the Hall IC and the outside is mounted on the substrate.

The rotation position of the rotor can be detected by the Hall IC.

A lead wire from the winding of the stator is not connected to the substrate. Therefore, the substrate does not have a power line for driving the motor. On the substrate, a Hall signal component connected to a motor drive control IC is arranged, and there is no motor drive control IC or the like. Therefore, the substrate can be easily retrofitted and replaced.

Further, the fixing portion and the fixed portion are located on the outer side in the radial direction with respect to the rotor.

Since the fixing portions and the fixed portions are located on the outer side in the radial direction with respect to the rotor, the substrate can be easily fixed and removed.

Further, the fixing portion has a screw hole extending in the axial direction, the fixed portion has a hole facing the screw hole in the axial direction and penetrating in the axial direction, and the substrate is fixed to the case by a screw penetrating the hole being screwed into the screw hole.

Since the substrate and the case are fixed with the hole of the substrate and the screw hole of the case, the substrate can be easily fixed and removed.

Further, three or more fixing portions and fixed portions are provided, and the restricting portion and the restricted portion are located in a polygon having the three or more fixing portions and fixed portions as vertices.

Since the restricting portion and the restricted portion are located in the polygon having the three or more fixing portions and fixed portions as vertices, the positional deviation in the circumferential direction of the substrate can be reduced.

Further, the stator has a stator core and an insulator fixed to the stator core, the restricting portion has a plurality of convex portions protruding outward in the radial direction on the outer surface side of the insulator, the restricted portion has a plurality of concave portions recessed outward in the radial direction on the inner surface side of the substrate, and the plurality of convex portions are fitted into the plurality of concave portions to restrict the position in the circumferential direction of the substrate.

Since the convex portions are fitted into the concave portions, the substrate can be accurately positioned.

Since the convex portions are provided on the thin-walled portions on the outer side in the radial direction of the insulator, the convex portions can serve as reinforcing ribs for the thin-walled portions, and can suppress the deformation in the radial direction of the insulator. The deformation in the radial direction of the insulator causes the position of the substrate to be shifted.

Further, a tangent line to one side surface in the circumferential direction of the concave portion on one end side in the circumferential direction among the plurality of concave portions is parallel to a tangent line to the other side surface in the circumferential direction of the concave portion on the other end side in the circumferential direction among the plurality of concave portions.

Therefore, when retrofitting the substrate, the convex portions can be smoothly fitted into the concave portions, and the substrate can be easily retrofitted.

The convex portions have a semicircular shape as viewed from the axial direction. The convex portions may have a triangular shape as viewed from the axial direction. The convex portions may have a trapezoidal shape as viewed from the axial direction.

The invention according to the above-described embodiment provides a motor including a central shaft extending in an axial direction; a stator extending in the axial direction around the central shaft; and a rotor facing the outer side in a radial direction of the stator and configured to rotate around the central shaft. The rotor includes a rotor plate fitted with the central shaft, a rotor core fitted with the rotor plate and having an accommodating portion recessed outward in the radial direction on the inner side in the radial direction, a rotor magnet accommodated in the accommodating portion and facing the stator on the inner side in the radial direction, and a magnet holder having a holder claw portion that restricts the movement of the rotor magnet toward one side in the axial direction and inward in the radial direction.

Therefore, the magnet holder can prevent the rotor magnet from falling off inward in the radial direction.

Further, the holder claw portion has a first claw portion extending inward in the radial direction from the inner peripheral portion and a second claw portion extending toward the other side in the axial direction from the first claw portion. The first claw portion faces one side in the axial direction of the rotor magnet, and the second claw portion faces the inner side in the radial direction of the rotor magnet.

Therefore, the rotor core, the rotor plate, and the magnet holder can hold the rotor magnet from six directions, so that it is possible to further prevent the rotor magnet from falling off.

Further, the inner surface in the radial direction of the rotor magnet is a flat surface, and the holder claw portion is located at an end portion in the circumferential direction of the rotor magnet.

Since the inner surface in the radial direction of the rotor magnet is a flat surface, the gap between the rotor magnet and the stator is larger at the end portion than at the center portion in the circumferential direction of the rotor magnet. When the holder claw portion is provided at the end portion in the circumferential direction of such a rotor magnet, the holder claw portion does not interfere with the rotation of the motor and can reliably hold the rotor magnet.

Further, the rotor has a plurality of rotor magnets adjacent to each other in the circumferential direction, and the holder claw portion holds the ends in the circumferential direction of both of the adjacent rotor magnets.

Since the holder claw portion holds both of the adjacent rotor magnets, the length in the circumferential direction of the holder claw portion can be increased, and the strength of the holder claw portion can be increased.

The adjacent rotor magnets have different poles from each other. Therefore, when the rotor magnets face the stator, a force outward in the radial direction acts on the other of the rotor magnets when a force inward in the radial direction acts on one of the rotor magnets. Therefore, one holder claw portion that holds the ends in the circumferential direction of both of the adjacent rotor magnets needs only be able to support one of the rotor magnets.

Further, the magnet holder has a plurality of holder claw portions adjacent to each other in the circumferential direction, one of the plurality of holder claw portions is located at one end in the circumferential direction of the rotor magnet, and another one adjacent to the holder claw portion is located at the other end in the circumferential direction of the rotor magnet.

Since both ends in the circumferential direction of the rotor magnet are held, it is possible to further prevent the rotor magnet from falling off inward in the radial direction.

Further, the magnet holder is made of a non-magnetic material.

Since the magnet holder is made of a non-magnetic material, it does not affect the poles of the rotor magnet. Further, even when the poles of adjacent rotor magnets are different, the magnetic force will not be short-circuited. Moreover, there is no influence on the magnetic force toward the Hall IC.

Further, the rotor core is composed of a laminated steel plate formed by laminating a plurality of electromagnetic steel plates in the axial direction, and the axial thickness of the magnet holder is thicker than the axial thickness of one electromagnetic steel plate.

Therefore, the strength of the magnet holder can be secured.

Further, the radial thickness of the second claw portion is thicker than the axial thickness of one electromagnetic steel plate.

Further, the magnet holder holds the rotor magnet via an adhesive.

Therefore, the adhesive can absorb the dimensional tolerance between the magnet holder and the rotor magnet. In particular, the laminated steel plates have a large dimensional tolerance, and a structure for absorbing the dimensional differences is required.

Moreover, even when the curvature of the bent portion between the first claw portion and the second claw portion of the holder claw portion is small (R is gentle), the rotor magnet can be held without the interference between the holder claw portion and the rotor magnet (while the rotor magnet is not affected by the curved surface of the bent portion).

Further, the rotor plate includes a rotor plate having a plate claw portion that restricts the movement of the rotor magnet toward the other side in the axial direction and inward in the radial direction.

The rotor plate can further prevent the rotor magnet from falling off inward in the radial direction.

Further, the plate claw portion extends to one side in the axial direction from the inner peripheral portion of the rotor plate, and the plate claw portion faces the inner side in the radial direction of the rotor magnet.

The rotor core, the rotor plate, and the magnet holder can hold the rotor magnet from six directions, so that it is possible to further prevent the rotor magnet from falling off.

Further, the length in the circumferential direction of the holder claw portion facing the inner surface of the rotor magnet is shorter than the length in the circumferential direction of the plate claw portion facing the inner surface of the rotor magnet.

The plate claw portion holds the inner surface of the rotor magnet mainly over the length in the circumferential direction. The rotor plate is an aluminum die-cast part and is easily bent when it is long in the axial direction. Therefore, when the plate claw portion is short in the axial direction and long in the circumferential direction, a large contact area between the plate claw portion and the rotor magnet can be secured, and the holding force can be increased.

The holder claw portion holds the inner surface of the rotor magnet mainly over the length in the axial direction. The magnet holder is an aluminum plate and is easily bent when the holder claw portion is long in the axial direction and short in the circumferential direction. Further, when the holder claw portion is long in the axial direction and short in the circumferential direction, a large contact area between the holder claw portion and the rotor magnet can be secured, and the holding force can be increased.

Further, in the facing surface between the plate claw portion and the rotor magnet, the length in the circumferential direction is longer than the length in the axial direction.

Moreover, in the facing surface between the holder claw portion and the rotor magnet, the length in the circumferential direction is longer than the length in the axial direction.

Next, a second embodiment of the invention will be described. Since a basic configuration of the motor <NUM> in the present embodiment is not different from that in the first embodiment, a duplicate description will be omitted, and only the different parts will be described. In other words, unless otherwise noted in the present embodiment, the configuration of the motor <NUM> is the same as that in the first embodiment.

<FIG> shows an air compressor <NUM> according to a second embodiment of the invention. <FIG> is a plan view showing a state in which a cover (not shown) covering an upper surface of the air compressor <NUM> is removed. The air compressor <NUM> is a portable compressor, and is used in a state of being mounted on the ground with the +Z direction as the upward direction and the -Z direction as the downward direction.

As shown in <FIG>, the air compressor <NUM> according to the present embodiment includes two tanks <NUM> and a mechanism part arranged above the tanks <NUM>. The mechanism part includes the motor <NUM>, a fan <NUM>, a compression mechanism, a control board, and the like.

The fan <NUM> is provided for introducing cooling air into the mechanism part to cool heat-generating parts such as the motor <NUM> and the control board. The fan <NUM> is fixed to the shaft <NUM> of the motor <NUM>, and is configured to integrally rotate when the motor <NUM> is driven.

The compression mechanism is driven by the motor <NUM> to generate compressed air, and compresses the air introduced into a cylinder by reciprocating a piston. The air compressor <NUM> according to the present embodiment is a multi-stage compressor having two compression mechanisms of a primary compression mechanism <NUM> and a secondary compression mechanism <NUM>.

As shown in <FIG>, the primary compression mechanism <NUM> includes a primary cylinder 610a and a primary piston 610b reciprocally arranged in the primary cylinder 610a, and the air in the primary cylinder 610a can be compressed by reciprocating the primary piston 610b with the driving force of the motor <NUM>. Further, the secondary compression mechanism <NUM> includes a secondary cylinder 611a and a secondary piston 611b reciprocally arranged in the secondary cylinder 611a, and the air in the secondary cylinder 611a can be compressed by reciprocating the secondary piston 611b with the driving force of the motor <NUM>. The air supplied form the outside is first compressed by the primary compression mechanism <NUM>. The air compressed by the primary compression mechanism <NUM> is introduced into the secondary compression mechanism <NUM> and further compressed by the secondary compression mechanism <NUM>. The air compressed in two stages in this way is sent and stored in the tank <NUM>.

The tank <NUM> is provided for storing the compressed air generated by the compression mechanism. The air compressor <NUM> according to the present embodiment includes two tanks <NUM>. The two tanks <NUM> are arranged parallel to each other along the longitudinal direction of the air compressor <NUM>.

The compressed air stored in the tank <NUM> is depressurized to an arbitrary pressure by passing through a pressure reducing valve <NUM>, and can be taken out from an air outlet to the outside. In the present embodiment, an air coupler <NUM> is provided at the air outlet, and an air hose can be attached and detached with one touch. By connecting the air hose to the air outlet in this way, the compressed air in the tank <NUM> can be taken out and used.

Meanwhile, although not particularly shown, a control board that controls the entire operation of the air compressor <NUM> is provided between the compression mechanism and the tank <NUM>. This control board is arranged on the lower surface side of the compression mechanism so as to be substantially horizontal to the ground. This control board is mainly composed of a CPU, and includes a ROM, a RAM, and an I/O, and the like. Further, the CPU is configured to control various input devices and output devices by reading a program stored in the ROM.

Examples of the input device of this control board include various operation switches, pressure sensors, Hall ICs (rotation position detection circuit), thermistors, and the like. Meanwhile, the input device is not limited to these input devices, and other input devices may be provided.

The operation switch refers to various switches that can be operated by a user. Although not described in detail herein, for example, a plurality types of operation switches such as a switch for turning the power on and off and a switch for switching the operation mode may be provided. This operation switch is arranged on an operation panel provided on the surface of a cover (not shown).

The pressure sensor is provided for measuring the internal pressure of the tank <NUM>. The control board controls the start or stop of the driving of the motor <NUM> based on the pressure value detected by the pressure sensor. Specifically, the ON pressure, which is a pressure value for starting the driving of the compression mechanism, and the OFF pressure, which is a pressure value for stopping the driving of the compression mechanism, are preset. For example, when the internal pressure of the tank <NUM> drops due to the use of compressed air and the internal pressure of the tank <NUM> drops to the preset ON pressure, the motor <NUM> is driven to fill the compressed air. Further, when the internal pressure of the tank <NUM> reaches the preset OFF pressure while the motor <NUM> is being driven, the driving of the motor <NUM> is stopped.

As already described in the first embodiment, the Hall IC (rotation position detection circuit) is provided for detecting the rotation position of the motor <NUM>. The control board can calculate the rotation speed (rpm) of the motor <NUM> by analyzing the signal from the Hall IC.

The thermistor is provided for detecting the temperature of the motor <NUM>. The temperature detected by this thermistor is used to correct the control of the motor <NUM>.

Further, as the output device of this control board, the motor <NUM> is provided. That is, the control board is configured to control the rotation of the motor <NUM> based on the input signal from the input device described above.

Subsequently, a specific aspect of the compression mechanism and the motor <NUM> according to the present embodiment will be described.

<FIG> is a perspective view of the compression mechanism and the motor <NUM>.

<FIG> is a front view of the compression mechanism and the motor <NUM> shown in <FIG>, as viewed from the -Y side.

<FIG> is a front view showing a state in which the rotor plate <NUM> is removed from the compression mechanism and the motor <NUM> shown in <FIG>, as viewed from the -Y side.

The compression mechanism and the motor <NUM> according to the present embodiment include the shaft <NUM> extending in the axial direction, the stator <NUM>, the rotor <NUM>, a substrate <NUM>, and a case <NUM>.

The motor <NUM> is an outer rotor type motor in which the rotor <NUM> is arranged on the outer side in the radial direction of the stator <NUM>. Basic aspects of the stator <NUM> and the rotor <NUM> are the same as those in the first embodiment.

In the present embodiment, as shown in <FIG> and <FIG>, the motor <NUM> is arranged on the front side (-Y side) of the compression mechanism. As shown in <FIG>, the shaft <NUM> of the motor <NUM> penetrates the inside of the compression mechanism, and cylinders of the compression mechanism protrude on both the left and right sides of the shaft <NUM>. Specifically, the primary compression mechanism <NUM> is arranged on the -X side of the shaft <NUM>, and the secondary compression mechanism <NUM> is arranged on the + X side of the shaft <NUM>. The shaft <NUM> of the motor <NUM> serves as a crankshaft of the compression mechanism. The crankshaft and crank mechanism are well known structures. That is, a crank arm is attached to the shaft <NUM> (crankshaft), and a connecting rod is attached to the crank arm via a crank pin. A piston is attached to the tip of the connecting rod. When the shaft <NUM> rotates, the crank arm attached to the shaft <NUM> (crankshaft) rotates, and thus, the connecting rod reciprocates while swinging. With such an action, the rotation motion of the shaft <NUM> is converted into the reciprocating motion of the piston, and the compression mechanisms arranged on both sides of the shaft <NUM> are activated.

As shown in <FIG> and <FIG>, the substrate <NUM> has an arcuate shape with a central angle of about <NUM> degrees and has a length of <NUM> degrees in the circumferential direction. Similar to the first embodiment, on this substrate <NUM>, the Hall ICs (not shown) are mounted at intervals of <NUM> degrees in the circumferential direction. The Hall IC is an example of a rotation position detection circuit that detects the rotation position of the rotor <NUM>. Meanwhile, although not particularly shown, the Hall IC according to the present embodiment is a Hall IC for surface mounting and is surface-mounted on the substrate <NUM>. When the Hall IC for surface mounting is used, the thickness in the axial direction can be suppressed.

This substrate <NUM> includes a connector arrangement portion <NUM> in which a connector to which an electric wire <NUM> can be connected is arranged. As shown in <FIG> and the like, this connector arrangement portion <NUM> is provided to protrude outward in the radial direction and located on the outer side in the radial direction with respect to the rotor <NUM>. In the present embodiment, a plurality of connectors are arranged on either the front or back surface of this connector arrangement portion <NUM>. Specifically, as shown in <FIG> and <FIG>, a control board connector <NUM> for connecting the control board and a thermistor connector <NUM> are arranged on the surface of the connector arrangement portion <NUM> on the side of the compression mechanism. A lead type thermistor is connected to the thermistor connector <NUM>. The control board connector <NUM> has a terminal capable of externally outputting the signal detected by the Hall IC and the signal of the thermistor inputted to the substrate <NUM> via the thermistor connector <NUM>. As the substrate <NUM> and the control board are connected by the electric wire <NUM> via these connectors, a signal can be outputted from the substrate <NUM> to the control board and used for feedback control.

Meanwhile, in the present embodiment, an axis of the motor <NUM> is arranged in a horizontal direction, and a control board having a control circuit for the motor <NUM> is arranged below the motor <NUM>. Further, as shown in <FIG> and the like, the connector arrangement portion <NUM> described above is arranged below the rotor <NUM>. Therefore, the electric wire <NUM> connected to the connector of the substrate <NUM> can be routed downward as it is and connected to the control board. In this way, the structure is such that the electric wire <NUM> can be easily handled. Further, since the connector arrangement portion <NUM> is not exposed on the upper surface, the structure is such that the substrate <NUM> is not easily damaged.

Further, this substrate <NUM> has protrusions <NUM>, <NUM>, and <NUM> protruding outward in the radial direction. These protrusions <NUM>, <NUM>, and <NUM> are provided at intervals of <NUM> degrees in the circumferential direction. Through-holes <NUM>, <NUM>, and <NUM> penetrating in the axial direction are formed in the protrusions <NUM>, <NUM>, and <NUM>, respectively.

The case <NUM> is a crankcase in which a part of the compression mechanism is incorporated. The case <NUM> according to the present embodiment incorporates a crank part that is a part of the compression mechanism. The crank part is a part of the compression mechanism and is a mechanism part around the crankshaft including the crank arm described above. This case <NUM> is located on one side in the axial direction with respect to the substrate <NUM>. This case <NUM> has four leg portions <NUM> protruding downward and is secured above the tank <NUM> by the four leg portions <NUM>. Meanwhile, of the four leg portions <NUM>, the pair of leg portions <NUM> arranged on the front side (-Y side) are arranged on the outer side in the radial direction of the substrate <NUM>.

The case <NUM> supports the stator <NUM>. The case <NUM> may not directly support the stator <NUM>. The substrate <NUM> is fixed to the case <NUM> by being screwed into screw holes <NUM>, <NUM>, and <NUM> of the case <NUM> through the through-holes <NUM>, <NUM>, and <NUM>. The screw holes <NUM>, <NUM>, and <NUM> of the case <NUM> extend from one end in the axial direction to the other side in the axial direction. The screw holes <NUM>, <NUM>, and <NUM> of the case <NUM> are examples of the fixing portions. The through-holes <NUM>, <NUM>, and <NUM> of the substrate <NUM> are examples of the fixed portions. Three or more fixing portions and fixed portions are provided. Since the substrate <NUM> is fixed to the case <NUM> instead of being fixed to the stator <NUM>, the substrate <NUM> can be easily retrofitted and replaced.

Further, this case <NUM> rotatably supports the crankshaft (the shaft <NUM>) of the compression mechanism. The case <NUM> may not directly support the crankshaft.

The case <NUM> described above has a support portion protruding outward in the radial direction from the substrate <NUM>. Specifically, as shown in <FIG> and <FIG>, the case <NUM> has a first support portion <NUM> protruding downward (-Z side) from the protrusion <NUM> of the substrate <NUM>, and a second support portion <NUM> protruding downward (-Z side) from the connector arrangement portion <NUM> of the substrate <NUM>. Since the support portion protruding outward in the radial direction from the substrate <NUM> in this way, the substrate <NUM> does not hit against the floor surface when the case <NUM> is placed on the floor surface.

By the way, the insulator <NUM> according to the present embodiment does not have the convex portions <NUM>, <NUM>, and <NUM> described in the first embodiment, and the substrate <NUM> according to the present embodiment does not have the concave portions <NUM>, <NUM>, and <NUM> described in the first embodiment. Therefore, the present embodiment is not configured such that the position in the circumferential direction of the substrate <NUM> is restricted by fitting the convex portions <NUM>, <NUM>, and <NUM> into the concave portions <NUM>, <NUM>, and <NUM>. The substrate <NUM> according to the present embodiment is attached to the case <NUM> so as not to come into contact with the insulator <NUM>.

Further, as shown in <FIG>, as viewed in the axial direction, a gap G larger than a thickness T of the substrate <NUM> is provided between the insulator <NUM> and the fixing portion of the case <NUM>. Therefore, even when the substrate <NUM> is slid horizontally in the X-axis direction or the Y-axis direction, the substrate <NUM> does not come into contact with the insulator <NUM>. By setting in this manner, the substrate <NUM> can be moved inward to overlap the insulator <NUM>, so that the substrate <NUM> can be moved relatively freely.

Here, in the present embodiment, as shown in <FIG>, the leg portions <NUM> are arranged on the outer side in the radial direction of the substrate <NUM>. Therefore, the substrate <NUM> cannot be slid outward in the radial direction as it is. Further, the leg portion <NUM> is arranged between the protrusions <NUM>, <NUM> of the substrate <NUM>. Therefore, when the substrate <NUM> is slid in the circumferential direction as it is, the protrusions <NUM>, <NUM> interfere with the leg portion <NUM>. In such an arrangement, when the convex portions <NUM>, <NUM>, and <NUM> are fitted into the concave portions <NUM>, <NUM>, and <NUM> as in the first embodiment, the leg portions <NUM> may become an obstacle and the substrate <NUM> may not be replaced. In this regard, in the present embodiment, the gap G larger than the thickness T of the substrate <NUM> is provided between the insulator <NUM> and the fixing portion of the case <NUM>. Therefore, the substrate <NUM> can be rotated in the circumferential direction, and the substrate <NUM> can be replaced while avoiding the leg portions <NUM>. Meanwhile, in the present embodiment, the fixing portion of the case <NUM> is formed to protrude toward the motor <NUM> as viewed in the axial direction. Therefore, a recessed portion <NUM> that is recessed to the side opposite to the motor <NUM> from the fixing portion as viewed in the axial direction is provided on the inner side in the radial direction of the fixing portion (see <FIG>). This recessed portion <NUM> extends in the circumferential direction so as to face the stator <NUM>. Therefore, when the substrate <NUM> is rotated in the circumferential direction at the time of replacement, the substrate <NUM> can be rotated using the recessed portion <NUM> of the case <NUM>, making it difficult for the substrate <NUM> to come into contact with the insulator <NUM>.

Meanwhile, the inner corner of the substrate <NUM> according to the present embodiment has a chamfered shape <NUM> (C surface in the present embodiment). Therefore, even when the inner corner of the substrate <NUM> comes into contact with the insulator <NUM> and the like at the time of sliding and replacing the substrate <NUM>, breakage or damage is less likely to occur.

Next, the operation and effect of the air compressor <NUM> will be described.

The invention according to the above-described embodiment provides an air compressor including a motor; a compression mechanism configured to be driven by the motor; and a crankcase in which a part of the compression mechanism is incorporated. The motor includes a central shaft extending in an axial direction; a stator extending in the axial direction around the central shaft; a rotor facing the outer side in a radial direction of the stator and configured to rotate around the central shaft; and a substrate which is located on one side in the axial direction with respect to the rotor and on which a rotation position detection circuit that detects the rotation position of the rotor is mounted. The crankcase has a fixing portion configured to fix the substrate, and the substrate has a fixed portion fixed to the fixing portion.

Since the substrate is fixed to the crankcase, the substrate can be easily retrofitted and replaced.

Further, the stator has a stator core and an insulator fixed to the stator core, and as viewed in the axial direction, a gap larger than the thickness of the substrate is provided between the insulator and the fixing portion.

Since the gap larger than the thickness of the substrate is provided between the insulator and the fixing portion, the substrate and the insulator are less likely to interfere with each other, and thus, the substrate can be easily retrofitted and replaced.

Further, the rotation position detection circuit is surface-mounted on the substrate.

When the rotation position detection circuit is surface-mounted on the substrate, the axial thickness can be reduced. Therefore, the substrate and the insulator are less likely to interfere with each other, and thus, the substrate can be easily retrofitted and replaced.

Further, the substrate has a connector arrangement portion in which a connector to which an electric wire can be connected is arranged, and the connector arrangement portion is located on the outer side in the radial direction with respect to the rotor.

Since the connector arrangement portion is located on the outer side in the radial direction with respect to the rotor, the electric wire can be easily attached to and detached from the connector, and thus, the substrate can be easily retrofitted and replaced.

Further, a plurality of connectors are arranged in the connector arrangement portion. Since a plurality of connectors are arranged in one connector arrangement portion in this way, the electric wire can be easily attached to and detached from the connector, and thus, the substrate can be easily retrofitted and replaced.

Further, an axis of the motor is arranged in a horizontal direction, a control board having a control circuit for the motor is arranged below the motor, and the connector arrangement portion is arranged below the rotor. Since the control board is arranged below the motor and the connector arrangement portion is arranged below the rotor, the control board and the connector arrangement portion are close to each other. Therefore, the electric wire connecting both members can be easily handled, and thus, the substrate can be easily retrofitted and replaced.

Further, the crankcase has a support portion that protrudes outward in the radial direction from the substrate. Since the support portion that protrudes outward in the radial direction from the substrate is provided, the substrate does not hit against the floor when the motor <NUM> and the compression mechanism are placed on the floor, and the damage of the substrate can be prevented.

Meanwhile, in the second embodiment described above, the aspect in which the insulator <NUM> does not have the convex portions <NUM>, <NUM>, and <NUM>, and the substrate <NUM> does not have the concave portions <NUM>, <NUM>, and <NUM> has been described. However, the invention is not limited thereto. The same convex portions <NUM>, <NUM>, and <NUM> as those in the first embodiment may be provided on the insulator <NUM>, and the same concave portions <NUM>, <NUM>, and <NUM> as those in the first embodiment may be provided on the substrate <NUM>. Further, the position in the circumferential direction of the substrate <NUM> may be restricted by fitting the convex portions <NUM>, <NUM>, and <NUM> into the concave portions <NUM>, <NUM>, and <NUM>. That is, the stator may have a restricting portion that restricts the position in the circumferential direction of the substrate, and the substrate may have a restricted portion whose position in the circumferential direction is restricted by the restricting portion.

Claim 1:
A motor (<NUM>) comprising:
a central shaft extending in an axial direction;
a stator (<NUM>) extending in the axial direction around the central shaft;
a rotor (<NUM>) facing an outer side in a radial direction of the stator (<NUM>) and configured to rotate around the central shaft;
a substrate (<NUM>) which is located on one side in the axial direction with respect to the rotor (<NUM>) and on which a rotation position detection circuit configured to detect a rotation position of the rotor (<NUM>) is mounted; and
a case (<NUM>) located on one side in the axial direction with respect to the substrate (<NUM>) and configured to support the stator (<NUM>), wherein
the case (<NUM>) includes a fixing portion configured to fix the substrate (<NUM>), and
the substrate (<NUM>) includes a fixed portion fixed to the fixing portion,
characterized in that
the fixing portion and the fixed portion are located on an outer side in the radial direction with respect to the rotor (<NUM>).