Patent Description:
<CIT> describes a motor comprising: an outer stator assembly comprising a stator core, first and second end plates made of insulating material and a winding wound onto the stator core, wherein the winding comprises input and output ends; an inner rotor assembly comprising a rotor shaft extending along a first straight line (rotation axis, shaft direction), a fan is disposed on the rotor shaft; and a terminal assembly configured to connect or fix the input and output ends; wherein the stator core comprises first-type laminations, wherein each of the first-type laminations is provided with connection arms and a special-shaped portion, the special-shaped portions are configured to form an access slot for connecting a front insulator when the first-type laminations are stacked along a direction parallel to the first straight line (rotation axis), and the access slot is disposed on an outer sidewall of the stator core.

<CIT> discloses a motor comprising: an outer stator assembly comprising a stator core, first and second end plates out of insulating material and a winding wound onto the stator core, wherein the winding comprises implicitly input and output ends; an inner rotor assembly comprising a rotor shaft extending along a first straight line (rotation axis); and a terminal assembly configured to connect and fix the input and output ends; wherein the stator core comprises first-type laminations, wherein the terminal assembly is mechanically fixed to a stator frame.

<CIT> describes a motor structure, comprising: an outer stator assembly comprising a stator core and a winding wound onto the stator core, wherein the winding comprises an input and an output end and wherein implicitly an inner rotor assembly comprising a rotor shaft extending along a first straight line (rotation axis); wherein a terminal assembly is configured to connect or fix the input end and the output end; wherein the stator core comprises implicitly first-type laminations and an insulating first end plate able to guide the winding to retain the winding connections, wherein slotted eyes are disposed on an outer sidewall of the stator core. The portions forming an access slot are portions of a stator insulation layer.

<CIT> describes a motor structure, comprising: an outer stator assembly comprising a stator core wherein a winding could be wound onto the stator core, wherein such a winding would implicitly comprise an input end and an output end and an inner rotor assembly comprising a rotor shaft extending along a first straight line (rotation axis); wherein a terminal assembly is configured to connect or fix the input end and the output end; wherein the stator core comprises implicitly first-type laminations, wherein each of the first-type laminations is provided with connection arms and a special-shaped portion, the special-shaped portions are configured to form an access slot for connecting the terminal assembly when the first-type laminations are stacked along a direction parallel to the first straight line (rotation axis), and the access slot is disposed on an outer sidewall of the stator core.

<CIT> describes a brushless electric motor includes a stator and a rotor. The stator includes a core defining a plurality of stator teeth, a first end cap proximate a first end of the core, a second end cap proximate a second end of the core, and a plurality of coils disposed on the respective stator teeth. The stator also includes a plurality of coil contact plates overmolded within one of the first end cap or the second end cap that short-circuit diagonally opposite coils on the stator.

As a power source, a motor is widely used in various power tools. Generally, the motor drives a transmission assembly or an output assembly by outputting a torque. For some power tools which have compact structures and small spaces in housings, on the one hand, the motors are required to output relatively strong power, and on the other hand, the dimensions of the motors are required to be limited within preset ranges, which require compact structures of the motors themselves. In the related art, the radial dimension and the axial dimension of the motor are increased to different degrees because of a connection relationship between an input end and an output end of a winding and the connection of an external power control wire. How to reduce the dimensions of the motor and make the motor more compact and more adaptable is technical problem to be urgently solved by those skilled in the art.

The present application provides a motor with a compact structure and high adaptability.

In the motor provided by the present application, connection terminals are provided on the stator core of the motor and connected on a side surface of the motor, thereby effectively reducing an axial dimension of the motor and making the motor more adaptable.

Although <FIG> do not depict an embodiment of the present invention, they are provided to facilitate the understanding of certain features of the present invention.

Generally, the components in embodiments of the present application, which are described and illustrated in the drawings herein, may be arranged and designed through various configurations.

It is to be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a particular item is defined in one drawing, the item needs no further definition and explanation in subsequent drawings.

In the description of the present application, it is to be noted that orientations or position relations indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "in" and "out" are those based on the drawings or those in which products of the present application are usually placed when used. These orientations or position relations are intended only to facilitate and simplify the description of the present application and not to indicate or imply that a device or element referred to must have such particular orientations and must be configured or operated in such particular orientations. Thus, these orientations or position relations are not to be construed as limiting the present application. Moreover, terms such as "first", "second", and "third" are merely used for distinguishing the description and are not to be construed as indicating or implying relative importance. In the description of the present application, unless otherwise specified, the term "a plurality of" or "multiple" means two or more.

In the description of the present application, it is to be further noted that unless otherwise expressly specified and limited, terms "disposed" and "connected" are to be understood in a broad sense. For example, the term "connected" may refer to "securely connected", "detachably connected", or "integrated", or may refer to "mechanically connected" or "electrically connected". For those of ordinary skill in the art, specific meanings of the preceding terms in the present application may be understood based on specific situations.

In the present application, unless otherwise expressly specified and limited, when first feature is described as "on" or "below" a second feature, the first feature and the second feature may be in direct contact or be in contact via another feature between the two features instead of being in direct contact. Moreover, when the first feature is described as "on", "above", or "over" the second feature, the first feature is right on, above, or over the second feature, the first feature is obliquely on, above, or over the second feature, or the first feature is simply at a higher level than the second feature. When the first feature is described as "under", "below", or "underneath" the second feature, the first feature is right under, below, or underneath the second feature, the first feature is obliquely under, below, or underneath the second feature, or the first feature is simply at a lower level than the second feature.

Embodiments of the present application are described in detail below, and examples of the embodiments are illustrated in the drawings. The same or similar reference numerals represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are exemplary and intended to explain the present application and not to be construed as limiting the present application.

As shown in <FIG>, a motor <NUM> in a first embodiment is an inner-rotor motor and includes a stator assembly <NUM>, a rotor assembly <NUM>, a first end plate <NUM>, and a second end plate <NUM>. The rotor assembly <NUM> is at least partially disposed in the stator assembly <NUM>. In some alternative embodiments, the rotor assembly <NUM> may also be disposed on an outer side of the stator assembly <NUM> and fixed through the first endplate <NUM> and the second end plate <NUM>. Specifically, the rotor assembly <NUM> includes a rotor shaft <NUM> extending along a direction of a first straight line <NUM> (that is, an axial direction). As an implementation, the rotor shaft <NUM> is further provided with a fan <NUM> for the heat dissipation of the motor <NUM>. The stator assembly <NUM> includes a stator core <NUM> and a winding <NUM>. The winding <NUM> is wound onto the stator core <NUM>. When the winding <NUM> is powered on, a rotor of the motor <NUM> begins to rotate. As shown in <FIG>, the stator core <NUM> is provided with connection arms 111a for the winding <NUM> to be wound around. A gap exists between adjacent connection arms 111a, and the winding <NUM> is wound around the connection arms 111a and at least partially in the gap. The winding <NUM> includes an input end 112a from which the winding <NUM> is wound around the connection arms 111a and an output end 112b from which the winding <NUM> is wound out of the connection arms 111a. As an implementation, the motor <NUM> is provided with a terminal assembly <NUM> for fixing the input end 112a and the output end 112b.

The first end plate <NUM> and the second end plate <NUM> are disposed on two sides of testator core <NUM>, respectively. The fan <NUM> and the second end plate <NUM> are mounted on the same side of the stator core <NUM>.

As shown in <FIG>, the stator core <NUM> is provided with an access slot 111b configured to connect the terminal assembly <NUM>. Specifically, the stator core <NUM> is composed of multiple laminations. As an implementation, the laminations include first- type laminations 111c and second-type laminations 111e. The first-type laminations 111c and the second-type laminations 111e are integrally connected through their own riveting fasteners. The first-type lamination 111c is formed with the connection arms 111a and a special-shaped portion 111d. The second-type lamination 111e is formed with the connection arms 111a. Multiple first-type laminations 111c are stacked along the direction of the first straight line <NUM>, and special-shaped portions 111d of the first- type laminations 111c form the preceding access slot 111b. The access slot 111b is disposed on an outer wall <NUM> of the stator core <NUM>. The access slot 111b is formed with a bayonet for the terminal assembly <NUM> to be inserted into and capable of fixing the terminal assembly <NUM>. To enable the access slot 111b to effectively fix the terminal assembly <NUM>, the access slot 111b has a preset length L along the direction of the first straight line <NUM>, where L is greater than or equal to <NUM> and less than or equal to <NUM>. More specifically, L is greater than or equal to <NUM> and less than or equal to <NUM>. When the terminal assembly <NUM> is connected to the access slot 111b, a bonding member may also be disposed on the access slot 111b, thereby further increasing reliability of the connection between the access slot 111b and the terminal assembly. In fact, the length L defines the length or number of the first-type laminations 111calong the direction of the first straight line <NUM>, that is, the length of the first-type laminations 111c along the direction of the first straight line <NUM> is limited within a preset length range or a preset number range. It is to be explained here that a length of the terminal assembly <NUM> along the direction of the first straight line <NUM> is substantially configured to be within a preset range as long as the input end 112a and the output end 112b of the winding <NUM> can be effectively wound. With such a setting, the length of the terminal assembly <NUM> along the direction of the first straight line <NUM> determines the length or number of the first-type laminations 111c along the direction of the first straight line <NUM>. The length of the access slot 111b formed by the first-type laminations 111c along the direction of the first straight line <NUM> is greater than or equal to a length of a guide rail portion of the terminal assembly <NUM> along the direction of the first straight-line <NUM>.

To adjust the dimension of the motor <NUM>, the number of the second-type laminations 111e may also be adjusted so that a length of the stator core <NUM> along the direction of the first straight line <NUM> is adjusted, thereby controlling a space occupied by the motor along the direction of the first straight line <NUM>. For a power tool having relatively large power output, the number of the second-type laminations 111e may be increased so that the dimension and output power of the motor <NUM> are adaptable to a requirement for high power. Under such a premise, the input end 112a and the output end 112b of the winding <NUM> are disposed on the access slot 111b so that the space occupied by the motor <NUM> along the direction of the first straight line <NUM> can be effectively controlled and the dimension of the entire motor can be controlled. For power tool that outputs relatively low power and occupies a relatively small space, the number of the second-type laminations 111e is adjusted so that the dimension of the motor <NUM> along the direction of the first straight line <NUM> may also be controlled. The input end 112a and the output end 112b of the winding <NUM> are disposed on the access slot so that the dimension of the motor <NUM> along the direction of the first straight lineman be further reduced. Thus, a driving portion of the power tool occupies a relatively small space, thereby facilitating the reduction of the dimension of the power tool and optimizing operation experience of a user.

As shown in <FIG>, the terminal assembly <NUM> includes an insertion member <NUM> and a wire hooking rack <NUM> configured to hook a wire. The insertion member <NUM> includes a guide rail portion 161a which can be inserted into the access slot 111b and an insertion slot 161b for the wire hooking rack <NUM> to be inserted into. The insertion member <NUM> is made of an insulation material and extends substantially along direction parallel to the first straight line <NUM>. The length of the access slot 111b formed by the first-type laminations 111c along the direction of the first straight line <NUM> is greater than or equal to the length of the guide rail portion 161a of the terminal assembly <NUM> along the direction of the first straight line <NUM>. The wire hooking rack <NUM> is inserted into the insertion slot 161b. The wire hooking rack <NUM> is specifically an arc segment 162d deviating from the direction of the first straight line <NUM>. With such design, the wire hooking rack <NUM> can further deviate from the stator core <NUM>. The wire hooking rack <NUM> further includes a first end and a second end. The first end is formed with a wire hooking portion 162a which is hook-shaped. The wire hooking portion 162a can easily hook the input end 112a and the output end 112b of the winding <NUM> so that the input end 112a and the output end 112b are fixed to the wire hooking portion 162a. The second end of the wire hooking rack <NUM> is formed with a connection portion 162b configured to connect a power control wire. The power control wire can supply electric power to the winding <NUM>. As an implementation, the connection portion is provided as a circular through hole which can facilitate the welding of the power control wire onto the wire hooking rack <NUM>. The wire hooking rack <NUM> is further provided with a limiting protrusion 162c connected to the insertion slot 161b. The limiting protrusion 162c can be inserted into the insertion slot 161b, thereby facilitating the positioning between the wire hooking rack <NUM> and the insertion member <NUM> and further facilitating the engagement between the wire hooking rack <NUM> and the insertion member <NUM>. Multiple wire hooking racks <NUM> are disposed. In a plane extending along the insertion member, an included angle between the multiple wire hooking racks is configured to be an acute angle. A gap 162e between two adjacent wire hooking racks <NUM> gradually increases along the direction of the first straight line <NUM>.

As shown in <FIG>, <FIG>, and <FIG>, the first end plate <NUM> includes a first fixing end <NUM> fixed to the stator core <NUM> and limiting portions for the winding <NUM> to be wound around. The first fixing end <NUM> is configured to be capable of being mounted in the preceding gap between the connection arms 111a of the stator core <NUM>. The second end plate <NUM> includes a second fixing end <NUM> fixed to the stator core <NUM>, and the second fixing end <NUM> can be configured to be mounted in the preceding gap between the connection arms 111a of the stator core <NUM>. The limiting portions of the first end plate <NUM> include first limiting portion <NUM> and second limiting portions <NUM>. The first limiting portion <NUM> is provided as a protrusion extending along a direction perpendicular to the first straight line <NUM> and can prevent part of the winding <NUM> wound onto the first end plate from being detached from the first end plate <NUM> along the direction of the first straight-line <NUM>. In other embodiments, the first limiting portion may also be configured to extend along a direction obliquely intersecting with the first straight line <NUM> and can prevent part of the winding <NUM> wound onto the first end plate <NUM> from being detached from the first end plate <NUM> along the direction obliquely intersecting with the first straight line <NUM>. In fact, a main body of the first end plate <NUM> together with the first limiting portion <NUM> forms a limiting slot <NUM> into which the winding <NUM> may be wound. With such a design, both the input end 112a and the output end 112b of the winding <NUM> can be wound onto the first end plate <NUM>, and a winding mode of the winding <NUM> is optimized so that the input end 112a or the output end 112b of the winding <NUM> is prevented from being separately disposed on the first end plate <NUM> and the second endplate <NUM>, thereby effectively reducing the dimension of the motor <NUM> along the direction of the first straight line <NUM>. As an optional embodiment, the first limiting portion <NUM> is disposed on the first end plate <NUM>, thereby effectively integrating the input end 112a and the output end 112b of the winding <NUM>. The second limiting portions <NUM> of the first end plate <NUM> are provided as protrusions distributed substantially along the direction of the first straight line <NUM> and can cooperate with the wire hooking racks <NUM> to isolate wires of the windings <NUM> during the arrangement of the wires. Multiple second limiting portions <NUM> are disposed so that multiple channels can be formed to facilitate the isolation between the input end 112a and the output end 112b of the winding <NUM>.

As shown in <FIG> and <FIG>, the wire hooking rack <NUM> is mounted to the insertion member <NUM>. The limiting protrusion 162c disposed on the wire hooking rack <NUM> is inserted into the insertion slot of the insertion member <NUM> so that the wire hooking rack <NUM> and the insertion member <NUM> are connected integrally. In this case, the insertion member <NUM> and the wire hooking rack <NUM> are configured to be the terminal assembly <NUM> which can be mounted into the access slot 111b of the stator core <NUM>. In this process, the guide rail portion disposed on the insertion member <NUM> can guide the entire terminal assembly <NUM> into the access slot 111b, thereby greatly facilitating the assembly and positioning of the terminal assembly <NUM>. In this case, when the first end plate <NUM> and the second end plate <NUM> are fixed to the stator core <NUM>, one end of the terminal assembly <NUM> farther from the second-type laminations 111e has a preset distance H from the first end plate <NUM>, where H is greater than <NUM> and less than or equal to <NUM>. That is, a gap 13a exists between the terminal assembly <NUM> and the first end plate <NUM>. As an alternative implementation, H may also be configured to be greater than <NUM> and less than or equal to <NUM>. It is to be explained here that the preset distance H is for any position of the terminal assembly <NUM> away from the second-type laminations 111e. With such a configuration, when the winding <NUM> is wound around the wire hooking rack <NUM> through the channels formed by the preceding second limiting portions <NUM>, on the one hand, the input end 112a and the output end of the winding <NUM> can be away from the stator core <NUM> when connected to the wire hooking portion 162a of the wire hooking rack <NUM>, thereby providing a better insulation effect. On the other hand, it is also possible to provide a space between the input end 112a and the output end 112b of the winding <NUM> and the terminal assembly <NUM> for fixing members to be received so that the winding <NUM> can be disposed in a relatively fixed position and prevented from vibrating with the rotor during the high-speed operation of the motor <NUM>, thereby avoiding damages to the input end 112a or the output end 112b of the winding <NUM> due to resonance.

This embodiment further provides a power tool including the preceding motor <NUM>. The power tool may be a circular saw <NUM> shown in <FIG>, a reciprocating saw <NUM> shown in <FIG>, or another power tool with the motor. The power tool provided in this embodiment uses the preceding motor <NUM> and thus has the advantage of high operation stability.

A motor <NUM> according to the present application may have some features shown in <FIG> and <FIG>. The motor <NUM> differs from the motor <NUM> in embodiment one in that a terminal assembly <NUM> is disposed in a different mode and has a different structure. The same points as those in embodiment one are all applied to this embodiment. Technical solutions in this embodiment are described below in detail.

As shown in <FIG>, the motor <NUM> includes a first end plate <NUM> and a second end plate (not shown in the figures) which are configured for insulation and to fix a winding <NUM>. The first end plate <NUM> includes a first side surface and a second side surface (not shown in the figures). The first side surface is used for an input end and an output end of the winding <NUM> to be wound on; and the second side surface is configured to close and fix a stator assembly <NUM> and a rotor assembly. Specifically, the first side surface is formed with a first protrusion <NUM> for fixing the winding <NUM>. The winding <NUM> is fixed at the first protrusion <NUM> and starts to be wound into wire slots <NUM> on the first side surface. Then the winding <NUM> is wound around connection arms of a stator core and wound out of the connection arms, passes through the terminal assembly <NUM>, and is wound into the next group of connection arms after passing through the terminal assembly <NUM>. The terminal assembly <NUM> can divide the wire slot <NUM> into multiple layers. When the winding <NUM> is wound into the wire slot <NUM> and divided into different layers by the terminal assembly <NUM>, a dimension of the winding <NUM> in a circumferential direction around a direction of a first straight line <NUM> can be effectively reduced so that the winding <NUM> is prevented from protruding from a radial position of the first end plate <NUM>. On the one hand, the radial dimension of the motor <NUM> can be reduced, and on the other hand, the probability of the winding <NUM> being worn under an external action can be reduced.

As shown in <FIG>, the motor <NUM> further includes a housing <NUM> of the motor which encloses at least part of the stator assembly <NUM>. The housing <NUM> of the motor is mounted on an outer circumference of the stator assembly <NUM>. A limiting protrusion <NUM> is provided on the first end plate <NUM> and configured to fix the housing <NUM> of the motor along a circumferential direction of a rotor shaft <NUM> so as to avoid the relative rotation in the circumferential direction between the stator assembly <NUM> and the housing <NUM> of the motor during the operation of the motor <NUM>, thereby improving operation stability of the motor <NUM>.

Optionally, the motor <NUM> further includes a limiting member <NUM>. A first limiting groove 214a is disposed on an outer sidewall of the limiting protrusion <NUM> along the direction of the first straight line <NUM>. A second limiting groove <NUM> communicating with the first limiting groove 214a is disposed on an outer sidewall of the stator assembly <NUM> along the direction of the first straight line <NUM>. A third limiting groove 201a is disposed on an inner circumferential wall of the housing <NUM> of the motor along the direction of the first straight line <NUM>. The first limiting groove 214a and the second limiting groove <NUM> directly face and are buckled with the third limiting groove 201a to form a limiting cavity. The limiting member <NUM> is at least partially connected in the limiting cavity. The limiting member <NUM> is disposed in the limiting cavity to avoid the relative rotation in the circumferential direction between the housing <NUM> of the motor and the stator assembly <NUM>, thereby improving mounting stability of the housing <NUM> of the motor.

Optionally, two ends of the first limiting groove 214a respectively communicate with two ends of the limiting protrusion <NUM> along the direction of the first straight line <NUM>,and two ends of the second limiting groove <NUM> respectively communicate with two ends of the outer sidewall of the stator assembly <NUM> along the direction of the first straight line <NUM>. Such a structure enlarges the space in the limiting cavity, thereby increasing the contact area between the limiting member <NUM> and the limiting cavity and further ensuring the functions of limitation and anti-rotation.

Optionally, the first limiting groove 214a, the second limiting groove <NUM>, and the third limiting groove 201a are arc-shaped grooves, thereby facilitating machining. No sharp angle exists, thereby avoiding a limiting failure caused by stress concentration. Optionally, the first limiting groove 214a, the second limiting groove <NUM>, and the third limiting groove 201a have an equal opening width. With this structure, the limiting cavity is cylindrical, thereby facilitating the arrangement of a cylindrical limiting member <NUM>.

As an implementation, the limiting member <NUM> is in an interference connection to an inner wall of the limiting cavity so as to implement the function of anti-rotation. Optionally, the limiting member <NUM> may be a cylindrical pin having a diameter greater than an inner diameter of the limiting cavity so as to implement the interference connection to the inner wall of the limiting cavity.

As another implementation, the limiting member <NUM> is a screw, and an internal thread is disposed on part of the inner wall of the limiting cavity. For example, the internal thread may be disposed on the first limiting groove 214a and the third limiting groove 201a opposite to the first limiting groove 214a. Alternatively, the internal thread may be disposed on the second limiting groove <NUM> and the third limiting groove 201a opposite to the second limiting groove <NUM>. A specific position where the internal thread is disposed is not limited.

The housing <NUM> of the motor is further provided with a positioning boss 201b. An end surface of the limiting protrusion <NUM> abuts against an end surface of the positioning boss 201b along the direction of the first straight line <NUM> so as to limit a limiting boss in an axial direction.

Optionally, one or more limiting protrusions <NUM> may be provided. Optionally, multiple limiting protrusions <NUM> may be provided to ensure a limiting effect, and the multiple limiting protrusions <NUM> are uniformly distributed along the circumferential direction. Two limiting protrusions <NUM> are symmetrically disposed on the first end plate <NUM>. Correspondingly, two third limiting grooves 201a are disposed on the housing <NUM> of the motor <NUM>. To facilitate the assembly of the first end plate <NUM> and the stator assembly <NUM>, an even number of second limiting grooves <NUM> are disposed on the outer sidewall of the stator assembly <NUM>. Thus, when the first end plate <NUM> is mounted, the two limiting protrusions <NUM> only need to correspond to two of the second limiting grooves <NUM>, respectively. Optionally, six second limiting grooves <NUM> are provided.

The terminal assembly <NUM> includes multiple connection terminals distributed in circumferential positions of the first end plate <NUM> around the first straight line <NUM>. Multiple mounting slots <NUM> are disposed on the first end plate <NUM> for the mounting of the connection terminals <NUM>. As shown in <FIG>, the connection terminal <NUM> includes a connection portion 241a, a wire hooking portion 241b, and aware connection portion 241c. The connection portion 241a is configured to mate with the mounting slot <NUM> and can fix the connection terminal <NUM> to the first end plate <NUM>. A limiting protrusion is formed on or connected to the connection portion 241a and can prevent the connection terminal <NUM> from being detached from the mounting slot <NUM>. The wire hooking portion 241b has a hook-shaped structure and can divide the wire slot <NUM> on the first end plate <NUM>. Thus, the direction in which the winding <NUM> runs is divided so that a wiring portion of the winding <NUM> is isolated from a wire connection portion of the winding <NUM>, thereby avoiding interference between the wiring portion of the winding <NUM> and the wire connection portion of the winding <NUM> and preventing the interference from affecting the insulation effect. The wire connection portion 241c of the connection terminal <NUM> is also specifically hook-shaped and extends out from again body of the connection terminal <NUM> so that a control power control wire connected to the wire connection portion 241c can be away from the winding <NUM>, the stator core, or other components. In addition, the wire connection portion 241c is also disposed within a circumferential range formed by the first end plate <NUM> around the first straight line <NUM>. Thus, after the wire connection portion 241c is connected to the power control wire, the radial dimension of the wire connection portion 241c can be effectively controlled within a preset range. For some power tools each using two halves of a housing, when the motor <NUM> having a relatively small radial dimension is mounted in the housing, the dimension of a portion of the housing <NUM> of the motor for mounting the motor <NUM> can be effectively reduced so that the entire power tool is more compact and convenient for an operator to operate.

The motor <NUM> further includes a circuit board <NUM> for control. The circuit board <NUM> is disposed at one end of the motor <NUM>. Specifically, the circuit board <NUM> is disposed at an end of the motor <NUM> where a control power wire <NUM> is connected. As an implementation, the circuit board <NUM> is formed with a through hole <NUM> for the rotor shaft to pass through and a connection hole connected to the first end plate <NUM>. On a plane perpendicular to the direction of the first straight line <NUM>, a projection of the circuit board <NUM> on the plane along the direction of the first straight line <NUM> is configured to be triangular. Thus, on the one hand, the circuit board <NUM> has a relatively high structural strength so that the circuit board <NUM> is not damaged by vibration generated when the motor <NUM> rotates at a high speed. On the other hand, with such a configuration, after the circuit board <NUM> is connected to the first end plate <NUM>, there are still more connection channels between the winding <NUM> and the outside so that the winding <NUM> can be better cooled.

A power tool may include the preceding motor <NUM>. The power tool may be a circular saw <NUM> shown in <FIG>, a reciprocating saw <NUM> shown in <FIG>, or another power tool with the motor. The power tool provided in this embodiment uses the preceding motor <NUM> and thus has the advantage of high operation stability.

A motor <NUM> is shown in FIG. The motor <NUM> differs from the motor <NUM> in embodiment one in that a circuit board <NUM> is disposed in a different mode and has a different structure. The same points as those in embodiment one are all applied to this embodiment. Technical solutions in this embodiment are described below in detail.

The circuit board <NUM> is disposed at one end of the motor <NUM> and detachably connected to a first end plate or a second end plate of the motor <NUM>. As an implementation, the circuit board <NUM> is provided with a through hole 311a for a rotor shaft <NUM> to pass through and an integration portion <NUM> for circuit integration. The integration portion <NUM> is disposed on one side of the circuit board <NUM>. In fact, the integration portion <NUM> is configured for the installation of all electrical elements. A special-shaped hole <NUM> is formed on an inner side of the circuit board <NUM>. Specifically, the special-shaped hole <NUM> includes the through hole 311a for the rotor shaft <NUM> to pass through and a notch 311b distributed around the rotor shaft <NUM>. The special-shaped hole <NUM> makes part of a space around the rotor shaft <NUM> be hollowed out so that the rotor assembly has a larger communication space with the outside and the heat dissipation of the rotor assembly is facilitated.

Claim 1:
An inner-rotor motor (<NUM>), comprising:
a stator assembly (<NUM>) comprising a stator core (<NUM>) and a winding (<NUM>) wound onto the stator core (<NUM>), wherein the winding (<NUM>) comprises an input end (112a) and an output end (112b);
a first end plate (<NUM>) and a second end plate (<NUM>) disposed on two sides of the stator core (<NUM>), respectively;
a rotor assembly (<NUM>) disposed in the stator assembly (<NUM>), the rotor assembly (<NUM>) comprising a rotor shaft (<NUM>) extending along a first straight line (<NUM>);
and
a terminal assembly (<NUM>) configured to connect or fix the input end (112a) and the output end (112b); wherein the terminal assembly (<NUM>) includes an insertion member (<NUM>) made of an insulation material and at least one wire hooking rack (<NUM>) configured to hook a wire;
wherein the stator core (<NUM>) comprises first-type laminations (111c), wherein each of the first-type laminations (111c) is provided with connection arms (111a) and a special-shaped portion (111d), wherein the special-shaped portion (111d) is configured to form an access slot (111b) for connecting the terminal assembly (<NUM>) when the first-type laminations (111c) are stacked along a direction parallel to the first straight line (<NUM>), or an axial direction of the motor, wherein the access slot (111b) is disposed on an outer sidewall of the stator core (<NUM>);
wherein said access slot (111b) of said first laminations (111c) further forms a slot for inserting and fixing said terminal assembly (<NUM>), and therefore said access slot (111b) has a preset length (L) along the direction of the first straight line (<NUM>);
wherein the access slot (111b) has a preset length (L) along the direction of the first straight line (<NUM>) to enable the access slot (111b) to effectively fix the terminal assembly (<NUM>); wherein the insertion member (<NUM>) includes two guide rail portions (161a) which can be inserted into the access slot (111b)
and an insertion slot (161b) for the wire hooking rack (<NUM>) to be inserted into.