Patent Publication Number: US-2023155439-A1

Title: Motor

Description:
TECHNICAL FIELD 
     An embodiment relates to a motor. 
     BACKGROUND ART 
     A motor may include a rotor, a stator, a housing, and a plate. The rotor and the stator are included in the housing. The housing is a cylindrical member of which an upper portion is open. The plate covers the open upper portion of the housing. A busbar may be disposed on the stator. A terminal of the busbar may be connected to a coil wound around the stator, and the terminal of the busbar may be connected to a terminal part extending in an axial direction. The terminal part is connected to an external power source. 
     Since the terminal part extends in the axial direction, coupling between a mold of the terminal part and the plate may be degraded. In order to improve the coupling, a protruding portion of the terminal part passing through the plate may be ultrasonically welded to be coupled to the plate. 
     However, the ultrasonic welding of the protruding portion has a problem of a difficulty in managing the welding portion. In addition, there are problems that the ultrasonic welding process is complex, the terminal part is shaken during the welding process, and thus a position of the terminal part is deviated. 
     TECHNICAL PROBLEM 
     Accordingly, an embodiment is intended to solve the above problems and directed to providing a motor in which a terminal part is easily assembled. 
     Objectives to be achieved by the present invention are not limited to the above-described objective, and other objectives which are not described above will be clearly understood by those skilled in the art through the following descriptions. 
     TECHNICAL SOLUTION 
     One aspect of the present invention provides a motor including a housing, a stator disposed in the housing, a rotor disposed in the stator, a busbar disposed on the stator, a plate disposed on the busbar, and a terminal part including a body part in contact with the plate and a protruding part protruding from the body part and disposed on the plate, wherein a part of the body part is disposed between the housing and the plate in a radial direction. 
     Another aspect of the present invention provides a motor including a housing, a stator disposed in the housing, a rotor disposed in the stator, a busbar disposed on the stator, a plate disposed on the busbar, and a terminal part including a body part in contact with the plate and a protruding part protruding from the body part and protruding upward from the plate, wherein the body part includes a first region in which the body part overlaps the plate in a radial direction and a second region in which the body part overlaps the plate in an axial direction, and the first region is disposed outside the plate in the radial direction. 
     Still another aspect of the present invention provides a motor including a housing, a stator disposed in the housing, a rotor disposed in the stator, a busbar disposed on the stator, a plate disposed on the busbar, and a terminal part including a body part in contact with the plate and a protruding part protruding from the body part and protruding upward from the plate, wherein the body part includes a first body disposed on the plate, a second body disposed under the plate, and a third body connecting the first body and the second body, and the third body is disposed outside the plate. 
     The body part may include a first hole which passes from an outer side to an inner side of the body part in a first direction, and the plate may include a first protrusion which protrudes from an edge of the plate and is disposed in the first hole. 
     The body part may include a second protrusion protruding in an axial direction, the plate may include a second hole which is disposed to have a length greater than a width and at which the second protrusion is positioned, and a longitudinal direction of the second hole may be parallel to the first direction. 
     The body part may include a first surface which is disposed to face an inner circumferential surface of the housing and in which the second hole is disposed. 
     The body part may include a plurality of first ribs which protrude from the first surface in a radial direction and are in contact with the inner circumferential surface of the housing. 
     The first hole may include a second surface and a third surface which are disposed to face each other in an axial direction, a distance between the second surface and the third surface in the axial direction may be greater than a thickness of the plate and smaller than a height of the body part, and at least one of a boundary between the second surface and an inner surface of the body part and a boundary between the third surface and the inner surface of the body part may include a first inclined surface. 
     The body part may include a second rib which protrudes from at least any one of the second surface and the third surface and is in contact with the plate. 
     The terminal part may include a power terminal connected to a busbar terminal of the busbar, the plate may include a third hole disposed to correspond to a position of the power terminal, and the first protrusion may be disposed to overlap the third hole in the first direction. 
     Advantageous Effects 
     According to an embodiment, there is an advantage that a terminal part can be easily assembled with a plate without performing an ultrasonic welding process or without using a separate fastening member. 
     According to the embodiment, there is an advantage of reducing deformation or generation of foreign substances in an assembly process of the terminal part. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG.  1    is a view illustrating a motor according to an embodiment. 
         FIG.  2    is a view illustrating a busbar, a plate, and a terminal part before coupling. 
         FIG.  3    is a perspective view of the terminal part. 
         FIG.  4    is a front view of the terminal part. 
         FIG.  5    is a view illustrating a body part of the terminal part. 
         FIG.  6    is a side cross-sectional view illustrating a state in which the terminal part and the plate are mounted on a housing, taken along line A-A of  FIG.  3   . 
         FIG.  7    is a side cross-sectional view illustrating the state in which the terminal part and the plate are mounted on the housing, taken along line B-B of  FIG.  3   . 
         FIG.  8    is a view illustrating the plate. 
         FIG.  9    is a view illustrating a state in which a first rib is in contact with an inner surface of the housing in a state in which the terminal part is mounted on the housing. 
         FIG.  10    is a set of perspective views illustrating a state in which the terminal part is assembled with the plate. 
         FIG.  11    is a set of side views illustrating the state in which the terminal part is assembled with the plate. 
     
    
    
     MODES OF THE INVENTION 
     A direction parallel to a longitudinal direction (vertical direction) of a shaft will be referred to as an axial direction, a direction perpendicular to the axial direction about the shaft will be referred to as a radial direction, and a direction along a circumference of a circle having a radius in the radial direction about the shaft will be referred to as a circumferential direction. 
       FIG.  1    is a view illustrating a motor according to an embodiment. 
     Referring to  FIG.  1   , the motor according to the embodiment may include a rotor  100 , a magnet  200 , a stator  300 , a cover  400 , a housing  500 , a busbar  600 , a plate  700 , and a terminal part  800 . Hereinafter, the term “inward” refers to a direction toward the rotor  200  in the radial direction of the motor, and the term “outward” refers to a direction opposite to “inward.” 
     The rotor  100  may be a hollow member of which one side is open. Two ends of the rotor  100  may be rotatably supported by bearings in the axial direction. The rotor  100  may be disposed so that portions having different outer diameters are divided in the axial direction. 
     The magnet  200  may be disposed on an outer circumferential surface of the rotor  100 . 
     The stator  300  is disposed outside the magnet  200 . The stator  300  may include a stator core  310 , an insulator  320  mounted on the stator core  310 , and coils  330  wound around the insulator  320 . The coils  330  generate a magnetic field. The stator core  310  may be a single member or a combination of a plurality of divided cores. In addition, the stator core  310  may be formed in the form in which a plurality of thin steel plates are stacked on each other but is not necessarily limited thereto. For example, the stator core  310  may also be formed as one single part. 
     The cover  400  fixes the magnet  200  to the rotor  100 . The cover  400  surrounds partial regions of the magnet  200  and the rotor  100 . The cover  400  may be a mold member formed in an over molding manner or a can member or adhesive member surrounding the magnet. 
     The housing  500  may be disposed outside the stator  300 . The housing  500  may be a cylindrical member of which an upper portion is open. The rotor  100 , the magnet  200 , the stator  300 , and the cover  400  are accommodated in the housing  500 . In addition, the housing  500  may accommodate the bearings supporting the rotor  100 . 
     The busbar  600  is disposed on the stator  300 . The busbar  600  connects the coils  330  wound around the stator  300 . 
     The plate  700  is disposed on the busbar  600 . Bearings  10  are accommodated inside the plate  700 . 
     The terminal part  800  is disposed on the plate  700 . 
       FIG.  2    is a view illustrating the busbar  600 , the plate  700 , and the terminal part  800  before coupling. 
     Referring to  FIGS.  2  and  3   , the busbar  600  may be disposed under the plate  700 . The busbar  600  may include a busbar body  610  and busbar terminals  620 . The busbar body  610  may be an annular mold member. The busbar terminals  620  may be connected to end portions of the coils  330 . In addition, first terminals  621  of the busbar terminals  620  are in contact with the terminal part  800 . The first terminals  621  are disposed to extend upward. Three first terminals  621  may be respectively connected to U-phase, V-phase, and W-phase power sources. 
     The plate  700  is disposed on the busbar  600 . The plate  700  may be an annular member. The bearing supporting the rotor  100  may be disposed inside the plate  700 . 
     The terminal part  800  may include a body part  810 , power terminals  820 , and a protruding part  830 . 
     The body part  810  is fixed to the plate  700  and the housing  500 . 
     The power terminals  820  are connected to an external power source or terminals of a housing cover connected to an external power source. The power terminals  820  are fixed to the protruding part  830 . Second terminals  821  of the power terminals  820  are in contact with the first terminals  621  of the busbar  600 . 
     The protruding part  830  surrounds the power terminals  820 . The protruding part  830  protrudes from the body part  810  and is disposed on the plate  700 . The protruding part  830  is disposed to extend so that the power terminals  820  are connected to the external power source or the terminals of the housing cover connected to the external power source. 
     The terminal part  800  is a unit separate from the busbar  600 . 
       FIG.  3    is a perspective view of the terminal part, and  FIG.  4    is a front view of the terminal part. 
     Referring to  FIGS.  2  to  4   , the protruding part  830  protrudes from the body part  810 . The protruding part  830  serves to support the power terminals  820  disposed to extend in a longitudinal direction and guide the power terminals  820  to the external power source or the terminals of the housing cover connected to the external power source. 
     A part of each of the power terminals  820  is exposed from a front end of the protruding part  830 . In addition, the protruding part  830  includes openings  831 . The openings  831  are for exposing the second power terminals  821  of the power terminals  820  to the outside for fusing. In the state in which the power terminals  820  are fixed to the plate  700 , when the plate  700  is fixed to the housing  500 , the first power terminals  621  of the busbar  600  and the second power terminals  821  of the terminal part  800  are disposed to overlap so as to be in surface contact with each other in the openings  831 . 
       FIG.  5    is a view illustrating the body part  810  of the terminal part  800 . 
     Referring to  FIG.  5   , the body part  810  is fixed to the housing  500  and the plate  700  and structurally supports the power terminals  820  disposed on the protruding part  830  together with the protruding part  830 . The body part  810  may include a first body  811 , a second body  812 , and a third body  813 . 
     The first body  811  is positioned on the plate  700 . The protruding part  830  protrudes from the first body  811 . The second body  812  is positioned under the plate  700 . The third body  813  connects the first body  811  and the second body  812 . The third body  813  may be provided as a plurality of third bodies  813 . The plurality of third bodies  813  may be disposed apart from each other. A first hole  814  passing through inner and outer sides of the body part  810  may be disposed between the third bodies  813 . The first hole  814  is a hole into which a first protrusion  710  of the plate  700  is inserted. 
     A first rib  815  may be disposed on a first surface  801  of the body part  810  to protrude in the radial direction. The first surface  801  is a surface facing an inner circumferential surface of the housing  500 . The first rib  815  are portions in contact with an inner surface  520  of the housing  500  in a process of mounting the terminal part  800  on the housing  500 . The first rib  815  may be disposed to extend in the axial direction. In addition, the first rib  815  may be disposed as a plurality of first ribs. For example, some of the plurality of first ribs  815  may be disposed at one side of the first hole  814 , and others may be disposed at the other side of the first hole  814 . In addition, some of the plurality of first ribs  815  may be disposed to cross the first hole  814 . A second rib  814   c  may be disposed to protrude from an inner surface of the body part  810  in which the first hole  814  is formed. The second rib  814   c  is in contact with the first protrusion  710  of the plate  700  inserted into the first hole  814 . 
     The body part  810  may include a second protrusion  816 . The second protrusion  816  may protrude from a lower surface of the first body  811  in the axial direction. The second protrusion  816  is for guiding an assembly direction of the terminal part  800  in a process of assembling the terminal part  800  with the plate  700 . 
       FIG.  6    is a side cross-sectional view illustrating a state in which the terminal part  800  and the plate  700  are mounted on the housing  500 , taken along line A-A of  FIG.  3   . 
     Referring to  FIGS.  5  and  6   , after the terminal part  800  is assembled with the plate  700 , the terminal part  800  and the plate  700  may be mounted on the housing  500 . The terminal part  800  and the plate  700  may be mechanically coupled without performing an ultrasonic welding process or without using a separate fastening member 
     In the axial direction, a space between the lower surface of the first body  811  and an upper surface of the second body  812  is formed like a slot, and the terminal part  800  and the plate  700  may be mechanically assembled in a form in which a part of the plate  700  is inserted into the space. In addition, in a state in which the terminal part  800  is coupled to the plate  700 , the terminal part  800  is mounted on a step  510  disposed on the inner surface  520  of the housing  500  to be additionally coupled to the housing  500 . Accordingly, a part of the body part  810  is disposed between the housing  500  and the plate  700  in the radial direction. 
     The body part  810  includes a first region S 1  that overlaps the plate  700  in the radial direction and a second region S 2  that overlaps the plate  700  in the axial direction. The first region S 1  is disposed in the third body  813  and disposed outside the plate  700 . The second region S 2  is disposed in the first body  811  and the second body  812 , and disposed at upper and lower sides from the plate  700  on the basis of the plate  700 . The third body  813  may be in contact with the inner surface  520  of the housing  500 . The second body  812  may be disposed under the plate  700  and in contact with the step  510  of the housing  500 . 
       FIG.  7    is a side cross-sectional view illustrating the state in which the terminal part  800  and the plate  700  are mounted on the housing  500 , taken along line B-B of  FIG.  3   . 
     Referring to  FIG.  7   , when the plate  700  is assembled with the terminal part  800 , the first protrusion  710  of the plate  700  is disposed in the first hole  814  of the body part  810 . The first hole  814  may include a second surface  814   a  and a third surface  814   b  disposed to face each other in the axial direction. A distance d between the second surface  814   a  and the third surface  814   b  in the axial direction may be greater than a thickness t of the plate  700  and smaller than a height h of the body part  810 . 
     A first inclined surface  812   a  may be disposed on at least one of a boundary between the second surface  814   a  and the inner surface  520  of the body part  810  and a boundary between the third surface  814   b  and the inner surface  520  of the body part  810 . The first inclined surface  812   a  expands an entrance of the first hole  814  to guide the first protrusion  710  of the plate  700  to be easily slid and inserted into the first hole  814 . 
     A second inclined surface  813   b  may also be disposed at a corner around a boundary of a lower surface and an outer surface of the body part  810 . The second inclined surface  813   b  serves to reduce interference between the body part  810  and the housing  500  when the terminal part  800  is mounted on the housing  500  in a state in which the terminal part  800  is fixed to the plate  700 . 
       FIG.  8    is a view illustrating the plate  700 . 
     Referring to  FIG.  8   , the plate  700  may include the first protrusion  710 , a second hole  720 , and a third hole  730 . 
     The first protrusion  710  protrudes outward from an edge of the plate  700  in a first direction F. In this case, the first direction F is a direction in which the terminal part  800  slides to be assembled with the plate  700 . The first hole  814  of the body part  810  is also formed in the first direction F to correspond to the protruding direction of the first protrusion  710 . An edge  711  of the first protrusion  710  may have a curved surface. In this case, a curvature center of the edge  711  of the first protrusion  710  may be the same as a center C of the plate  700 . 
     The second hole  720  is a hole which passes through the plate  700  in the axial direction and in which the first protrusion  710  of the terminal part  800  is disposed. While the body part  810  is inserted into the plate  700 , the second protrusion  816  moves along the second hole  720  to guide movement of the body part  810 . The second hole  720  may be concavely formed inward from the edge of the plate  700 . 
     The second hole  720  is also disposed in the first direction F. The second hole  720  may be disposed as a plurality of second holes  720 . For example, the second holes  720  may include a 2-1 hole  721  and a 2-2 hole  722 , the 2-1 hole  721  may be disposed at one side of the first protrusion  710 , and the 2-2 hole  722  may be disposed at the other side of the second protrusion  816 . Each of a longitudinal direction of the 2-1 hole  721  and a longitudinal direction of the 2-2 hole  722  is a direction parallel to the first direction F. 
     The third hole  730  is a hole which passes through the plate  700  in the axial direction and through which the power terminal  820  of the busbar  600  passes. When the terminal part  800  is assembled with the plate  700 , a position of the third hole  730  corresponds to a position of the power terminal  820  of the terminal part  800 . The first protrusion  710  may be disposed to overlap the third hole  730  in the first direction F. 
       FIG.  9    is a view illustrating a state in which the first rib  815  is in contact with the inner surface  520  of the housing  500  in a state in which the terminal part  800  is mounted on the housing  500 . 
     Referring to  FIG.  9   , when the terminal part  800  is mounted on the housing  500 , the first rib  815  is in contact with the inner surface  520  of the housing  500 . When the first surface  801  of the body part  810  is in direct contact with the inner surface  520  of the housing  500 , a gap is generated between the body part  810  and the inner surface  520  of the housing  500 , and thus there is a risk that the terminal part  800  is moved or separated, but when the plurality of first ribs  815  are in contact with the inner surface  520  of the housing  500 , the movement of the terminal part  800  is prevented.  FIG.  10    is a set of perspective views illustrating a state in which the terminal part  800  is assembled with the plate  700 , and  FIG.  11    is a set of side views illustrating the state in which the terminal part  800  is assembled with the plate  700 . 
       FIGS.  10 A and  11 A  are views illustrating the terminal part  800  and the plate  700  before assembly is performed and showing a state in which the first hole  814  of the terminal part  800  is aligned with the first protrusion  710  of the plate  700 .  FIGS.  10 B and  11 A  are views illustrating a state in which the terminal part  800  is pushed and fixed to the plate  700  in the first direction F. When the terminal part  800  is pushed in the first direction F, the first protrusion  710  is inserted into the first hole  814 , and thus the terminal part  800  is coupled to the plate  700 . In this case, the first protrusion  710  of the terminal part  800  moves along the first hole  814  of the plate  700  to guide movement of the terminal part  800 . When the first protrusion  710  is inserted into the first hole  814 , the first protrusion  710  is in contact with the second rib  814   c . Accordingly, movement of the plate  700  which may occur between the first hole  814  and the first protrusion  710  may be reduced when compared to a state in which the first protrusion  710  is in direct contact with the second surface  814   a  or the third surface  814   b.    
     As described above, since the terminal part  800  is pushed from the outside to the inside of the plate  700  in the radial direction to assemble the terminal part  800  and the plate  700 , there is an advantage that an assembly process is very simply and quickly performed. In addition, since the first body  811  and the second body  812  of the terminal part  800  fix the plate  700  from the upper and lower sides of the plate  700  in the axial direction, and the third body  813  of the terminal part  800  restricts the plate  700  in the radial direction at the same time, the terminal part  800  can be firmly coupled to the plate  700  without using a separate fastening member or without performing a welding process. 
     In addition, in a state in which the terminal part  800  is mounted on the housing  500 , since the inner surface  520  of the housing  500  restricts the body part  810  of the terminal part  800  so as not to allow separation of the body part  810  of the terminal part  800  in the radial direction, and particularly, the outer surface of the body part  810  is in contact with the inner surface  520  of the housing  500 , structural stability is much higher when compared to a case in which the terminal part  800  is assembled using a fastening member or through a welding process. 
     The above-described embodiment can be used for various devices for vehicles, home appliances, or the like.