WO2019065338A1 - Motor - Google Patents

Abstract

In one embodiment of the motor of the present invention, the motor is equipped with: a base plate which is positioned to one side of a stator in the axial direction and is disposed such that the plate surface to which an integrated circuit is mounted faces toward the one side in the axial direction; and a heat sink which is disposed to one side of the base plate in the axial direction and is in thermal contact with the integrated circuit. The end portions of wrapped pins on one side in the axial direction and coil lead lines are fixed by solder to the surface of the base plate facing toward the one side in the axial direction. An end portion of the heat sink on the other side in the axial direction presses the integrated circuit toward the other side in the axial direction. When viewed from the axial direction, the heat sink is positioned upon a virtual straight line passing through at least one wrapped pin and the central axis of the motor shaft, and the heat sink is positioned between the wrapped pin and the central axis upon said virtual straight line.

Description

motor

The present invention relates to a motor.

In the motor of Patent Document 1, a terminal pin is described in which a winding end of a drive coil is entangled. The terminal pin protrudes from the terminal pin lead-out through portion of the power supply substrate. The end portion of the winding end is connected to the land of the feeding substrate by soldering.

JP, 2008-11650, A

There is room for improvement in maintaining the reliability of the solder for fixing the binding pin and the coil lead wire to the substrate well during the operation of the motor.

SUMMARY OF THE INVENTION In view of the above-described circumstances, the present invention has an object to provide a motor that can maintain good solder reliability.

In one aspect of the motor according to the present invention, a rotor having a motor shaft extending along a central axis, a stator facing the rotor with a gap in the radial direction, and one axial side of the stator are integrated. A substrate disposed with the surface on which the circuit is mounted facing in an axial direction, a heat sink disposed on one axial side of the substrate and in thermal contact with the integrated circuit, the rotor, the stator, A cover for receiving the substrate and the heat sink, the stator includes a stator core, a coil mounted on the stator core, an insulating portion radially opposed to the coil, and one side in the axial direction from the insulating portion And a plurality of binding pins around which the coil lead wire extending from the coil is wound and which penetrates the substrate in the axial direction, and one end of the binding pin in the axial direction The coil leader line is fixed to the surface facing the axial direction one side of the substrate by soldering, the heat sink is fixed to the cover, and the other axial end of the heat sink is an axis of the integrated circuit. The heat sink is positioned on an imaginary straight line passing through at least one of the binding pins and the central axis when viewed from the axial direction while holding the other toward the other side, and the winding pin and the center on the imaginary straight line The heat sink is located between the axis.

According to one aspect of the present invention, a motor capable of well maintaining the reliability of the solder is provided.

FIG. 1 is a perspective view showing a motor of the present embodiment. FIG. 2 is a perspective view showing the motor of the present embodiment. FIG. 3 is a plan view of the motor according to this embodiment as viewed in the other axial direction. FIG. 4 is a cross-sectional view showing the IV-IV cross section of FIG. FIG. 5 is a cross-sectional view showing a VV cross section of FIG. FIG. 6 is a front view of the heat sink as viewed from inside in the radial direction. FIG. 7 is a plan view of the inside of the motor from which the second cup body is removed, as viewed in the axial direction, and a front view of a plate surface facing the axial direction one side of the substrate. FIG. 8 is an enlarged cross-sectional view of the connection portion between the coil leader and the substrate.

As shown in FIGS. 1 to 5, the motor 1 according to this embodiment includes a rotor 5 having a cover 5, stud bolts 22, wiring members 50, and a motor shaft 3 extending along a central axis J, and a stator 4. And a pair of bearings 7, a substrate 20, a heat dissipation member 24, a heat sink 21, and a screw member 25. Among the both ends of the motor shaft 3, the first end where the output end 3 a is located is disposed outside the cover 5. The output end 3a is connected to a fan or the like (not shown) rotated by the motor 1.

In the present embodiment, the direction parallel to the central axis J is simply referred to as the “axial direction”. The direction from the first end where the output end 3a is located to the second end different from the first end among the both ends of the motor shaft 3 is referred to as one side in the axial direction. One side in the axial direction is the left side of FIGS. 4 and 5. The direction from the second end to the first end of the motor shaft 3 is referred to as the other side in the axial direction. The other axial side is the right side of FIGS. 4 and 5. The radial direction centered on the central axis J is simply referred to as "radial direction". Among the radial directions, the direction approaching the central axis J is referred to as the radially inner side, and the direction away from the central axis J is referred to as the radially outer side. The circumferential direction about the central axis J is simply referred to as "circumferential direction".

As shown in FIGS. 4 and 5, the cover 5 accommodates the rotor 2, the stator 4, the bearing 7, the substrate 20 and the heat sink 21. The cover 5 has a first cup body 6A and a second cup body 6B. The cover 5 has a bottomed cylindrical first cup body 6A and a second cup body 6B. The first cup body 6A and the second cup body 6B each have a bottomed cylindrical shape centered on the central axis J. In the example of the present embodiment, the first cup body 6A accommodates a later-described rotor magnet 2a of the rotor 2, a stator 4, and one bearing positioned on the other side in the axial direction of the pair of bearings 7. The second cup body 6B accommodates the one bearing 7, the substrate 20, the heat sink 21, and the heat dissipation member 24 located on one side in the axial direction of the pair of bearings 7.

As shown in FIG. 4, the cover 5 is made of sheet metal. At least the second cup body 6B of the first cup body 6A and the second cup body 6B is made of sheet metal. In the example of the present embodiment, the first cup body 6A and the second cup body 6B are made of sheet metal. The first cup body 6A and the second cup body 6B are made of, for example, steel plates. The first cup body 6A and the second cup body 6B are equal in axial dimension and radial dimension. The first cup body 6A and the second cup body 6B are press-formed into a cup shape by the same mold. That is, the first cup body 6A and the second cup body 6B are press-formed products. The cover 5 is a press cover.

The first cup body 6A is located on the other side in the axial direction with respect to the second cup body 6B. The second cup body 6B is located on one side in the axial direction with respect to the first cup body 6A. The first cup body 6A is open to one side in the axial direction. The second cup body 6B opens to the other side in the axial direction. Each of the first cup body 6A and the second cup body 6B has a bottom wall portion 8, a peripheral wall portion 9, and a flange portion 10. The first cup body 6A and the second cup body 6B are disposed such that the openings of the peripheral wall 9 face each other. The first cup body 6A and the second cup body 6B are fixed to each other in a state where their respective openings face in the axial direction. The flange portion 10 of the first cup body 6A and the flange portion 10 of the second cup body 6B axially face each other and contact each other. The flange portions 10 of the first cup body 6A and the second cup body 6B are fixed to each other. In the state where the first cup body 6A and the second cup body 6B are fixed to each other, the inside of the first cup body 6A and the inside of the second cup body 6B communicate with each other.

The bottom wall portion 8 has a bearing holding portion 18, a flat portion 8c, and a connection portion 8d. The bearing holding portion 18 has a bottomed cylindrical shape. The bearing holding portion 18 has a bottomed cylindrical shape centered on the central axis J. The bearing holder 18 opens toward the inside of the cover 5. The bearing holder 18 holds the bearing 7. The bearing 7 is, for example, a ball bearing or the like. The bearing 7 is fitted and fixed in the bearing holding portion 18. In the cover 5, a pair of bearings 7 are arranged axially apart from each other. The pair of bearings 7 is disposed at both axial ends of the cover 5. The pair of bearings 7 rotatably support the motor shaft 3. The bearing 7 supports the motor shaft 3 rotatably around the central axis J.

The bottom wall portion 8 of the first cup body 6A is provided with a shaft insertion hole 19 penetrating the bottom wall portion 8 in the axial direction. The shaft insertion hole 19 is provided in the bearing holding portion 18 of the first cup body 6A. The shaft insertion hole 19 is a through hole that penetrates the bottom of the bearing holder 18. The motor shaft 3 is inserted into the shaft insertion hole 19. The motor shaft 3 projects from the inside to the outside of the cover 5 through the inside of the shaft insertion hole 19.

The flat portion 8 c is an annular shape extending in the circumferential direction. The flat portion 8 c has an annular plate shape centered on the central axis J. The plate surface of the flat portion 8c is directed in the axial direction and extends in the direction orthogonal to the central axis J. The radial position of the flat portion 8 c is disposed outside the radial position of the bearing holding portion 18. The flat portion 8 c surrounds the bearing holding portion 18 from the radially outer side. The flat portion 8 c is disposed at a position overlapping the bearing holding portion 18 when viewed from the radial direction. The flat portion 8 c is connected to the peripheral wall portion 9. The outer edge of the flat portion 8 c is connected to the end of the peripheral wall 9 opposite to the opening along the axial direction.

A through hole 23 is provided in the bottom wall portion 8 of the second cup body 6B. The second cup body 6B has a plurality of through holes 23 penetrating the bottom wall 8 in the axial direction. The through hole 23 is, for example, a circular hole. The through hole 23 is provided in the flat portion 8c of the second cup body 6B. The through hole 23 penetrates the flat portion 8c of the second cup body 6B in the axial direction. The plurality of through holes 23 are disposed in the bottom wall portion 8 at intervals in the circumferential direction. The plurality of through holes 23 are arranged in the flat portion 8c at equal intervals in the circumferential direction.

A plurality of stud bolts 22 are provided on the bottom wall portion 8 of the second cup body 6B. The stud bolt 22 projects from the bottom wall 8 of the second cup body 6B in one axial direction. The plurality of stud bolts 22 are circumferentially spaced from each other on the bottom wall 8. In the present embodiment, three or more stud bolts 22 are provided on the bottom wall portion 8 of the second cup body 6B at intervals in the circumferential direction. In the illustrated example, four stud bolts 22 are provided on the bottom wall 8 at equal intervals in the circumferential direction. The plurality of stud bolts 22 are circumferentially spaced at the flat portion 8c. The stud bolt 22 is inserted into the through hole 23 and attached to the bottom wall 8. The stud bolt 22 is pressed into the through hole 23 and fixed to the flat portion 8 c. The motor 1 is attached and fixed to a device frame (not shown), which is an object to which the motor 1 is attached, using a stud bolt 22.

The stud bolt 22 has a bolt portion 22a and a head 22b. The bolt portion 22a has a columnar shape extending in the axial direction. The bolt portion 22a is cylindrical. The bolt portion 22 a is inserted into the through hole 23. The bolt portion 22 a protrudes axially to one side through the through hole 23. The bolt portion 22 a protrudes from the bottom wall portion 8 in one axial direction. The other axial end of the bolt portion 22 a is fitted into the through hole 23. In the bolt portion 22a, at least a portion other than the end portion on the other side in the axial direction is provided with a screw portion. In the example shown in FIG. 4, the screw portion is provided along the entire axial length of the bolt portion 22 a. The threaded portion has an external thread on the outer periphery. The screw portion is exposed to the outside of the cover 5.

The head 22b is plate-shaped. The head 22 b is in the form of a disk coaxial with the bolt portion 22 a. The head 22 b has an outer diameter larger than that of the bolt portion 22 a. The head 22 b is connected to the other axial end of the bolt 22 a. The head 22 b contacts the bottom wall 8 from the other side in the axial direction. The head 22 b contacts the bottom wall 8 from inside the motor. The head 22b contacts the flat surface 8a of the flat portion 8c described later from the other side in the axial direction. The dimension in which the head 22b protrudes from the flat portion 8c to the other side in the axial direction is, for example, 1 mm or less. In the example of the present embodiment, the dimension in which the head 22b protrudes from the flat portion 8c to the other side in the axial direction is 0.3 to 0.4 mm.

The bottom wall portion 8 of the second cup body 6B is provided with a screw attachment hole (not shown). The second cup body 6B has a screw mounting hole which penetrates the bottom wall 8 in the axial direction. The screw mounting hole is, for example, a circular hole. A plurality of screw mounting holes are provided in the flat portion 8c of the second cup body 6B. The screw mounting hole axially penetrates the flat portion 8c of the second cup body 6B. The plurality of screw mounting holes are circumferentially spaced apart from each other in the bottom wall portion 8. The number of screw mounting holes is two. A screw member 25 described later is inserted into the screw mounting hole.

The connecting portion 8 d connects the bearing holding portion 18 and the flat portion 8 c. The connecting portion 8 d connects the opening of the cylindrical portion of the bearing holding portion 18 and the inner peripheral edge of the flat portion 8 c. The connecting portion 8 d is disposed between the bearing holding portion 18 and the flat portion 8 c. The connecting portion 8 d is located between the bearing holding portion 18 along the radial direction and the flat portion 8 c. In the example of the present embodiment, the connecting portion 8 d has a tapered cylindrical shape centering on the central axis J. The connecting portion 8 d extends toward the opening of the peripheral wall 9 along the axial direction along the radial inward direction from the flat portion 8 c. That is, the connecting portion 8d of the first cup body 6A extends in the axial direction toward one side in the radial direction from the flat portion 8c. The connecting portion 8d of the second cup body 6B extends from the flat portion 8c toward the other side in the axial direction as it extends radially inward.

The surface facing the other side in the axial direction of the bottom wall portion 8 of the second cup body 6B has a flat surface 8a and a connection surface 8b. The flat surface 8a is disposed on the flat portion 8c of the second cup body 6B. The flat surface 8a is a surface facing the other side in the axial direction in the flat portion 8c of the second cup body 6B. The flat surface 8 a is an annular shape perpendicular to the central axis J. The flat surface 8 a is an annular surface that extends in the direction orthogonal to the central axis J. The flat surface 8 a is disposed at a radial position outside the radial position of the bearing holder 18. The flat surface 8 a surrounds the bearing holding portion 18 from the radially outer side.

The connection surface 8b is disposed at the connection portion 8d of the second cup body 6B. The connection surface 8b is a surface facing the other side in the axial direction in the connection portion 8d of the second cup body 6B. The connection surface 8 b connects the bearing holding portion 18 and the flat surface 8 a. The connection surface 8 b connects the opening of the cylindrical portion of the bearing holding portion 18 and the inner peripheral edge of the flat surface 8 a. The connection surface 8 b is disposed between the bearing holding portion 18 and the flat surface 8 a. The connecting surface 8 b is located between the bearing holding portion 18 along the radial direction and the flat surface 8 a. In the example of the present embodiment, the connection surface 8 b is in the form of a tapered surface centered on the central axis J. The connection surface 8 b extends from the bearing holding portion 18 toward one side in the axial direction as it extends radially outward.

The peripheral wall portion 9 is cylindrical with the central axis J as a center. The peripheral wall 9 is cylindrical. The peripheral wall portion 9 extends in the axial direction from the outer peripheral edge of the bottom wall portion 8. The peripheral wall portion 9 opens on the opposite side to the bottom wall portion 8 along the axial direction. An opening is located at the end of the peripheral wall 9 opposite to the bottom wall 8 along the axial direction. The end opposite to the opening along the axial direction of the peripheral wall 9 is closed by the bottom wall 8.

A plurality of stator support claws 9a are provided on the peripheral wall portion 9 of the first cup body 6A. The stator support claws 9 a protrude from the peripheral wall 9 into the inside of the first cup body 6A. The plurality of stator support claws 9 a are arranged at equal intervals in the circumferential direction in the peripheral wall portion 9. The stator support claws 9a are in contact with the stator 4 disposed in the first cup body 6A from the other side in the axial direction. The stator support claws 9 a support the stator 4 toward one side in the axial direction.

The peripheral wall portion 9 of the second cup body 6B has a bush 9b. The bush 9 b is cylindrical. The bush 9 b is elastically deformable. The peripheral wall portion 9 of the second cup body 6B is provided with a wiring through hole (not shown) penetrating the peripheral wall portion 9 in the radial direction. The bush 9 b is inserted into the wiring through hole and fixed to the peripheral wall 9. The inside and the outside of the cover 5 communicate with each other through the inside of the bush 9b. The wiring member 50 is passed through the bush 9b. The wiring member 50 passes through the inside of the bush 9 b and extends to the outside and the inside of the cover 5. A wire outlet (not shown) is provided at the radially inner end of the bush 9b. That is, the peripheral wall portion 9 of the second cup body 6B has a wiring lead-out port. The wiring outlet is a hole opened in the cover 5. The wiring member 50 passes through the inside of the bush 9 b and protrudes into the cover 5 from the wiring outlet. Wiring member 50 is electrically connected to substrate 20.

The flange portion 10 is an annular shape extending radially outward from an end edge of the peripheral wall portion 9 opposite to the bottom wall portion 8. The flange portion 10 has an annular plate shape that extends radially outward from an end portion of the peripheral wall portion 9 along the axial direction opposite to the bottom wall portion 8. The plate surface of the flange portion 10 is directed in the axial direction and extends in the direction orthogonal to the central axis J. The plate surface facing the axial direction one side of the flange portion 10 of the first cup body 6A and the plate surface facing the other axial direction side of the flange portion 10 of the second cup body 6B contact each other. The first cup body 6A and the second cup body 6B are disposed with their flanges 10 in contact with each other in the axial direction.

The rotor 2 has a motor shaft 3 and a rotor magnet 2a. A portion of the motor shaft 3 supported by the pair of bearings 7 and a portion located between the pair of bearings 7 are disposed inside the cover 5. A portion of the motor shaft 3 located on the other axial side of the bearing 7 accommodated in the first cup body 6A is disposed outside the cover 5. The motor shaft 3 and the pair of bearings 7 are prevented from moving in the axial direction with each other by a retaining ring or the like. The rotor magnet 2a has a cylindrical shape centered on the central axis J. The rotor magnet 2a is cylindrical. The rotor magnet 2 a is fixed to the outer peripheral surface of the motor shaft 3.

The stator 4 is fitted in the cover 5. The stator 4 is fitted and fixed to the inner peripheral surface of the peripheral wall portion 9 of the first cup body 6A. The stator 4 opposes the rotor 2 with a gap in the radial direction. The stator 4 opposes the rotor 2 from the radial direction outer side. The stator 4 has a stator core 26, a coil 27, an insulating portion 28 and a binding pin 29. The stator core 26 is an annular shape that surrounds the radially outer side of the rotor 2. The stator core 26 opposes the rotor magnet 2a with a gap in the radial direction. The stator core 26 faces the rotor magnet 2a from the radial direction outer side.

The coil 27 is attached to the stator core 26. The coil 27 is attached to the stator core 26 indirectly via the insulating portion 28. Insulating portion 28 has a portion disposed between stator core 26 and coil 27. The insulating portion 28 has a portion facing the coil 27 in the radial direction. That is, the insulating portion 28 faces the coil 27 in the radial direction. The insulating portion 28 has an outer peripheral side insulating portion 28 a located on the radially outer side of the coil 27 and an inner peripheral side insulating portion 28 b located on the radial inner side of the coil 27. The outer peripheral side insulating portion 28 a is opposed to the coil 27 from the outer side in the radial direction. The inner circumferential insulating portion 28 b faces the coil 27 from the inner side in the radial direction. The substrate 20 is attached and fixed to the outer peripheral side insulating portion 28a.

As shown in FIGS. 5 and 8, the insulating portion 28 has a substrate receiving portion 31 in contact with the substrate 20 from the other side in the axial direction. The substrate receiving portion 31 has an outer peripheral side substrate receiving portion 31 a and an inner peripheral side substrate receiving portion 31 b. The outer peripheral side substrate receiving portion 31 a is in contact with the outer peripheral portion of the other surface of the substrate 20 in the axial direction. The outer peripheral side substrate receiving portion 31 a contacts the substrate 20 from the other side in the axial direction on the radially outer side of the coil 27. The outer peripheral side substrate receiving portion 31a is provided in the outer peripheral side insulating portion 28a. A plurality of outer peripheral side substrate receiving portions 31a are provided on the outer peripheral side insulating portion 28a at intervals in the circumferential direction. That is, the insulating portion 28 has a plurality of outer peripheral side substrate receiving portions 31 a.

As shown in FIG. 5, the inner peripheral side substrate receiving portion 31 b contacts the other surface of the substrate 20 in the axial direction on the inner peripheral side of the coil 27. The inner peripheral side substrate receiving portion 31 b is in contact with the substrate 20 from the other side in the axial direction on the radially inner side of the coil 27. The inner peripheral side substrate receiving portion 31 b is provided in the inner peripheral side insulating portion 28 b. A plurality of inner peripheral side substrate receiving portions 31b are provided in the inner peripheral side insulating portion 28b at intervals in the circumferential direction. That is, the insulating portion 28 has a plurality of inner peripheral side substrate receiving portions 31 b.

As shown in FIGS. 7 and 8, the binding pin 29 extends from the insulating portion 28 in the axial direction to penetrate the substrate 20 in the axial direction. The binding pin 29 is provided on the outer peripheral side insulating portion 28a. A plurality of binding pins 29 are provided in the outer circumferential side insulating portion 28a in the circumferential direction at intervals. The binding pin 29 is disposed between the outer peripheral side substrate receiving portions 31a adjacent in the circumferential direction. A coil lead wire 27 a extending from the coil 27 is wound around the binding pin 29. The number of coil leader lines 27a is four. The four coil leads 27a are used for the U phase, the V phase, the W phase, and the neutral point. The number of binding pins 29 is four. The number of binding pins 29 is the same as the number of coil lead wires 27a. That is, four sets of the coil lead wire 27a and the binding pin 29 are provided.

As shown in FIGS. 4 and 5, the substrate 20 is located on one side in the axial direction of the stator 4. The substrate 20 has a disk shape. The substrate 20 is in the form of an annular plate centered on the central axis J. The plate surface of the substrate 20 is directed in the axial direction and spreads in a direction orthogonal to the central axis J. The motor shaft 3 extends in the axial direction radially inward of the substrate 20. As shown in FIG. 8, the substrate 20 is provided with a pin insertion hole 20 b penetrating the substrate 20 in the axial direction. The pin insertion holes 20 b are disposed at the outer peripheral edge of the substrate 20. A plurality of pin insertion holes 20 b are provided at intervals in the circumferential direction at the outer peripheral edge portion of the substrate 20. The number of pin insertion holes 20 b is the same as the number of binding pins 29. The binding pin 29 and the coil lead wire 27a are passed through the pin insertion hole 20b. The binding pin 29 and the coil lead wire 27a are inserted into the pin insertion hole 20b and protrude from a plate surface facing the axial direction one side of the substrate 20. The axial one end of the binding pin 29 and the coil lead wire 27 a are fixed to the surface of the substrate 20 facing the one axial side by the solder 30. As shown in FIG. 7, the solder 30 is disposed at the outer peripheral edge portion of the plate surface facing the axial direction one side of the substrate 20.

The substrate 20 is electrically connected to the stator 4. The substrate 20 is electrically connected to the coil leader 27 a of the coil 27. The substrate 20 is connected to the coil lead-out wire 27 a at the outer peripheral edge portion of the plate surface facing the axial direction one side of the substrate 20. That is, the connection portion between the substrate 20 and the coil lead wire 27 a is located at the outer peripheral edge of the substrate 20. As shown in FIGS. 4 and 5, the substrate 20 is located on one side in the axial direction of the rotor magnet 2a. The substrate 20 is disposed at a position overlapping the stator 4 and the rotor magnet 2 a when viewed from the axial direction. The substrate 20 is surrounded from the outer side in the radial direction by the outer peripheral side insulating portion 28 a. The substrate 20 is disposed at a position overlapping the outer circumferential insulating portion 28 a as viewed in the radial direction. In the example of the present embodiment, the substrate 20 is disposed at a position overlapping the flange portion 10 of the second cup body 6B as viewed in the radial direction.

As shown in FIG. 5, an integrated circuit 20 a and a capacitor (not shown) are mounted on the surface of the substrate 20. The substrate 20 is disposed so that the surface on which the integrated circuit 20a is mounted is directed to one side in the axial direction. As shown in FIG. 7, the integrated circuit 20a has a rectangular plate shape. The integrated circuit 20a has a rectangular plate shape whose circumferential length is larger than its radial length. The plate surface of the integrated circuit 20a faces in the axial direction. The plate surface of the integrated circuit 20a has a rectangular shape whose circumferential length is larger than its radial length. The integrated circuit 20 a is disposed radially inward from the outer peripheral edge of the substrate 20. The integrated circuit 20a is disposed radially inward of the connection portion (that is, the solder 30) of the substrate 20 and the coil lead wire 27a.

As shown in FIG. 7, the binding pin 29, the coil lead wire 27a (not shown) and the solder 30 are disposed between the integrated circuit 20a and the outer peripheral edge of the substrate 20 along the radial direction. As shown in FIG. 7, the heat sink 21 is positioned on a virtual straight line VL passing through at least one of the binding pins 29 and the central axis J when viewed from the axial direction, and on the virtual straight line VL The heat sink 21 is positioned between the central axis J and the central axis J. That is, viewed from the axial direction, the virtual straight line VL and the heat sink 21 intersect. Further, the heat sink 21 is disposed between the binding pin 29 and the central axis J along the radial direction. The at least one binding pin 29 and the heat sink 21 are arranged in the radial direction. At least one binding pin 29 and the heat sink 21 are radially opposed.

In the present embodiment, when viewed from the axial direction, the heat sinks 21 are positioned on a plurality of virtual straight lines VL respectively extending from the plurality of binding pins 29 to the central axis J, and on each virtual straight line VL. The heat sink 21 is located between the center axis J and the central axis J. In the example shown in FIG. 7, the heat sinks 21 are located on three imaginary straight lines VL extending from the three binding pins 29 to the central axis J, respectively, as viewed in the axial direction. As described later, since the heat sink 21 presses the integrated circuit 20a toward the other side in the axial direction, the integrated circuit 20a is also positioned on the virtual straight line VL.

The capacitor is mounted on a plate surface facing the axial direction one side of the substrate 20. The capacitor is cylindrical. The capacitor extends in the axial direction. The surface facing the axial direction one side of the capacitor axially opposes the bottom wall portion 8 of the second cup body 6B. The surface facing the axial direction one side of the capacitor is disposed with a gap between it and the surface facing the other axial direction side of the bottom wall portion 8.

As shown in FIG. 5, the heat dissipation member 24 is sandwiched between a heat sink 21 described later and the integrated circuit 20a. The heat dissipation member 24 is elastically deformable. The heat radiating member 24 is plate-shaped. The heat dissipating member 24 has a rectangular plate shape. The heat radiating member 24 is a rectangular plate having a circumferential length larger than a radial length. The plate surface of the heat dissipation member 24 is directed in the axial direction and spreads in a direction perpendicular to the central axis J. The plate surface of the heat dissipating member 24 has a rectangular shape whose circumferential length is larger than its radial length.

A plate surface facing the other side in the axial direction of the heat dissipation member 24 contacts the integrated circuit 20 a. A plate surface facing the other axial direction side of the heat radiation member 24 contacts a plate surface facing the one axial direction side of the integrated circuit 20a. The surface area of the plate surface facing the other axial direction side of the heat dissipation member 24 is larger than the surface area of the plate surface facing the one axial direction side of the integrated circuit 20 a. The plate surface facing the other axial direction side of the heat radiation member 24 covers the plate surface facing the one axial direction side of the integrated circuit 20 a. A plate surface facing the axial direction one side of the heat dissipation member 24 contacts the heat sink 21. A plate surface facing the axial direction one side of the heat dissipation member 24 contacts an end surface 21 a facing the other axial direction side of the heat sink 21. The surface area of the plate surface facing the axial direction one side of the heat dissipation member 24 is larger than the surface area of the end face 21 a. A plate surface facing the axial direction one side of the heat dissipation member 24 covers the end face 21 a.

The heat sink 21 is disposed on one side in the axial direction of the substrate 20. The heat sink 21 is in thermal contact with the integrated circuit 20a. The heat sink 21 is in thermal contact with the integrated circuit 20 a via the heat dissipation member 24. The heat sink 21 is fixed to the cover 5. The heat sink 21 is attached and fixed to the second cup body 6B. The heat sink 21 is fixed to the bottom wall 8 of the second cup body 6B.

As shown in FIGS. 5 and 6, the heat sink 21 has a first end 21c, a second end 21d, and a bent portion 21e. The first end 21 c is the other end of the heat sink 21 in the axial direction. The first end 21c is in thermal contact with the integrated circuit 20a. The first end 21 c presses the integrated circuit 20 a toward the other side in the axial direction. The first end 21 c has a rectangular parallelepiped shape. The first end 21 c has a circumferential length greater than the radial length.

The first end 21 c has an end face 21 a facing the other side in the axial direction, a face 21 h facing inward in the radial direction, and a face 21 j facing outward in the radial direction. That is, the heat sink 21 has an end face 21 a facing the other side in the axial direction. The end face 21a is rectangular. The end face 21a is rectangular. The end face 21a has a circumferential length greater than the radial length. The end face 21 a contacts the heat dissipation member 24 from one side in the axial direction. The surface area of the end face 21a is substantially the same as the surface area of the plate surface facing the axial direction one side of the integrated circuit 20a. The end face 21 a is disposed at a position overlapping the heat dissipation member 24 and the integrated circuit 20 a when viewed in the axial direction. The peripheral edge portion of the end face 21a is disposed at a position substantially overlapping the peripheral edge portion of the integrated circuit 20a when viewed in the axial direction.

The surface 21 h is rectangular. The surface 21 h is rectangular. The surface 21 h has a circumferential length greater than the axial length. The surface 21 j is rectangular. The surface 21 j is rectangular. The surface 21 j has a circumferential length greater than the axial length.

The second end 21 d is an end on one side in the axial direction of the heat sink 21. The second end 21 d has a rectangular parallelepiped shape. The second end 21 d has a circumferential length greater than the radial length. The second end 21 d contacts the bottom wall 8 of the second cup body 6B. The second end 21 d contacts the flat portion 8 c of the bottom wall 8 from the other side in the axial direction. The second end 21 d contacts the flat surface 8 a.

The second end 21 d is disposed at a radial position outside the radial position of the first end 21 c. That is, the radial center position of the second end 21 d is disposed radially outward of the radial center position of the first end 21 c. The radially inner end of the second end 21 d is located radially outward of the radially inner end of the first end 21 c. The radially outer end of the second end 21 d is located radially outward of the radially outer end of the first end 21 c.

The second end 21 d has an end face 21 b facing in one axial direction, a face 21 i facing inward in the radial direction, and a face 21 k facing outward in the radial direction. That is, the heat sink 21 has an end face 21 b facing in the axial direction. The end face 21 b is rectangular. The end face 21 b is rectangular. The end face 21b has a circumferential length greater than the radial length. The size of the surface area of the end face 21b is the same as or larger than the size of the surface area of the end face 21a. That is, the surface area of the end surface 21b is equal to or larger than that of the end surface 21a.

The end face 21b contacts the bottom wall portion 8 of the second cup body 6B from the other side in the axial direction. As shown in FIG. 3, the end face 21 b contacts a portion of the other surface of the bottom wall portion 8 of the second cup body 6 </ b> B located between the stud bolts 22 adjacent in the circumferential direction. The end face 21b contacts a portion of the other surface of the bottom wall 8 of the second cup body 6B in the axial direction, which is located between the head portions 22b adjacent in the circumferential direction (see FIGS. 4 and 5). ). As shown in FIG. 5, the end face 21b contacts the flat surface 8a of the flat portion 8c. That is, the second end 21d contacts the flat surface 8a. The second end 21 d is disposed at a position overlapping the flat surface 8 a when viewed in the axial direction.

Although not shown, screw holes are provided on the end face 21b. That is, the second end 21 d has a screw hole. The screw hole opens in the end face 21 b and extends in the axial direction. The screw hole has an internal thread on its inner periphery. A plurality of screw holes are provided in the second end 21 d. The plurality of screw holes are spaced apart from one another in the second end 21d in the circumferential direction. The number of screw holes is two. A screw member 25 described later is inserted into the screw hole portion and fixed.

As shown in FIGS. 5 and 6, the surface 21i has a square shape. The surface 21i is rectangular. The surface 21i has a circumferential length greater than the axial length. The radial position of the surface 21i is disposed outside the radial position of the surface 21h. The surface 21k is rectangular. The surface 21k is rectangular. The surface 21 k has a circumferential length greater than the axial length. The radial position of the surface 21 k is disposed outside the radial position of the surface 21 j.

The bent portion 21 e is a portion located between the axially opposite end portions 21 c and 21 d of the heat sink 21. The bent portion 21 e is an intermediate portion located between the axially opposite end portions 21 c and 21 d of the heat sink 21. That is, the bending portion 21e is disposed at an intermediate position between the first end 21c and the second end 21d in the axial direction. The bending portion 21 e connects the first end 21 c and the second end 21 d.

The bent portion 21e has a first step surface 21f and a second step surface 21g. That is, the heat sink 21 has the first step surface 21 f and the second step surface 21 g. The first step surface 21 f connects the surface 21 h and the surface 21 i. The first step surface 21 f faces one side in the axial direction. The first step surface 21f has a rectangular shape. The first step surface 21 f has a rectangular shape. The first step surface 21 f has a circumferential length greater than the radial length. The second step surface 21g connects the surface 21j and the surface 21k. The second step surface 21g faces the other side in the axial direction. The second step surface 21g has a rectangular shape. The second step surface 21g has a rectangular shape. The second step surface 21g has a circumferential length greater than the radial length. The axial position of the second step surface 21g is disposed on the other side in the axial direction relative to the axial position of the first step surface 21f.

In the example of the present embodiment, the circumferential length of the heat sink 21 is substantially constant over the entire axial length. A pair of side surfaces facing the circumferential direction of the heat sink 21 is in the form of a plane parallel to the central axis J. The pair of side surfaces are parallel to each other. The side surface is flush with the first end 21c, the bent portion 21e and the second end 21d.

The radial length of the heat sink 21 is larger at the bending portion 21 e than at the first end 21 c and the second end 21 d. The radial length of the heat sink 21 is maximized at the bending portion 21 e. The radial length of the second end 21 d is the same as or larger than the radial length of the first end 21 c. That is, the length in the radial direction of the second end 21 d is equal to or greater than the length in the radial direction of the first end 21 c.

As shown in FIGS. 2, 3 and 5, the screw member 25 fastens the bottom wall 8 of the second cup body 6 </ b> B and the heat sink 21. The screw member 25 fastens and fixes the flat portion 8c of the second cup body 6B and the second end 21d of the heat sink 21. A plurality of screw members 25 are provided. The plurality of screw members 25 are circumferentially spaced apart from each other on the bottom wall 8. The number of screw members 25 is two.

As shown in FIG. 3, the screw member 25 is disposed at a radial position outside the radial position of the stud bolt 22 in the bottom wall portion 8. The screw member 25 is disposed at a radial position outside the polygon having the respective stud bolts 22 at the top of the bottom wall portion 8. In the example of the present embodiment, the screw members 25 are disposed radially outward of a quadrangle having four stud bolts 22 as apexes.

The screw member 25 has a screw portion (not shown) and a head. The screw portion has a cylindrical shape extending in the axial direction. The threaded portion has an external thread on the outer periphery. The screw portion is inserted into the screw attachment hole of the bottom wall portion 8 and attached to the screw hole portion of the second end 21 d. That is, the screw member 25 is fixed to the second end 21 d. The head has a larger outer diameter than the threaded portion. The head is connected to one axial end of the screw portion. The head contacts the bottom wall 8 from one side in the axial direction. The head contacts the bottom wall 8 from the outside of the motor. The head contacts the flat portion 8c from one side in the axial direction. The head protrudes from the bottom wall 8 to one side in the axial direction.

According to the present embodiment, during operation of the motor 1, the first end 21 c of the heat sink 21 holds the substrate 20 near the binding pin 29. Thereby, the vibration in the vicinity of the binding pin 29 of the substrate 20 is suppressed, and the reliability of the solder 30 is well maintained.

In the present embodiment, the insulating portion 28 includes the substrate receiving portion 31 in contact with the substrate 20 from the other side in the axial direction. Since the heat sink 21 presses the substrate 20 from one side in the axial direction and the substrate receiving portion 31 of the insulating portion 28 presses the substrate 20 from the other side in the axial direction, vibration in the axial direction at the position of the binding pin 29 of the substrate 20 It is suppressed more.

In the present embodiment, the insulating portion 28 has a plurality of outer peripheral side substrate receiving portions 31 a in contact with the outer peripheral portion of the surface on the other side in the axial direction of the substrate 20. Therefore, the vibration at the outer peripheral portion of the substrate 20 can be suppressed. Further, the insulating portion 28 has a plurality of inner peripheral side substrate receiving portions 31 b that contact the other surface of the substrate 20 in the axial direction on the inner peripheral side of the coil 27. Thus, the vibration of the substrate 20 can be further suppressed.

The present invention is not limited to the above-described embodiment. For example, as described below, changes in configuration and the like are possible without departing from the spirit of the present invention.

In the above-mentioned embodiment, although 1st cup body 6A and 2nd cup body 6B presupposed that it is sheet metal, it is not limited to this composition. The first cup body 6A and the second cup body 6B may be, for example, an aluminum die-cast other than the sheet metal.

In FIG. 4, the rotor magnet 2a and the stator 4 may be accommodated in the first cup 6A and the second cup 6B instead of being accommodated in the first cup 6A. However, when the rotor magnet 2a and the stator 4 are accommodated in the first cup body 6A as in the above-described embodiment, the arrangement space of the capacitor mounted on the plate surface facing the axial direction one side of the substrate 20 It is more preferable because the motor 1 can be miniaturized in the axial direction while securing the Further, the substrate 20, the heat dissipation member 24, and a part of the heat sink 21 may be located in the first cup body 6A.

Instead of fixing the heat sink 21 to the bottom wall portion 8 of the second cup body 6B using the screw member 25, it may be fixed using an adhesive or the like. However, since the screw member 25 is used, the manufacturing time is shortened and the productivity is improved as compared with the case of using an adhesive or the like. The heat dissipating member 24 may not be provided. For example, a heat dissipation grease or the like may be provided instead of the heat dissipation member 24.

The shape of the heat sink 21 is not limited to the configuration described in the above embodiment. The heat sink 21 may have, for example, a simple rectangular shape. The heat sink 21 may have a polygonal columnar shape, a cylindrical shape, or the like. The heat sink 21 may have a plurality of fins on the outer peripheral surface facing in the direction orthogonal to the axial direction.

In the embodiment described above, the heat sinks 21 are located on three virtual straight lines VL extending from the three binding pins 29 to the central axis J, as viewed in the axial direction. In the present invention, the heat sink 21 may be positioned on an imaginary straight line VL passing through at least one binding pin 29 and the central axis J when viewed from the axial direction. Therefore, the heat sink 21 may be located on one virtual straight line VL passing through one binding pin 29 and the central axis J. The heat sink 21 may be positioned on two imaginary straight lines VL extending from the two binding pins 29 to the central axis J respectively. The heat sink 21 may be positioned on four imaginary straight lines VL extending from the four binding pins 29 to the central axis J, respectively.

In addition, without departing from the spirit of the present invention, each configuration (component) described in the above-described embodiment, modification, and note may be combined, and addition, omission, replacement, and other configurations can be made. Changes are possible. Moreover, this invention is not limited by embodiment mentioned above, It is limited only by the claim.

DESCRIPTION OF SYMBOLS 1 ... motor, 2 ... rotor, 3 ... motor shaft, 4 ... stator, 5 ... cover, 20 ... board | substrate, 20a ... integrated circuit, 21 ... heat sink, 26 ... stator core, 27 ... coil, 27a ... coil leader line, 28 ... Insulating part, 29: binding pin, 30: solder, 31: board receiving part, 31a: outer peripheral side board receiving part, 31b: inner peripheral side board receiving part, J: central axis, VL: virtual straight line

Claims (5)

A rotor having a motor shaft extending along a central axis;
A stator which faces the rotor in a radial direction with a gap therebetween;
A substrate located on one side in the axial direction of the stator and disposed with the plate surface on which the integrated circuit is mounted facing the one side in the axial direction;
A heat sink disposed on one axial side of the substrate and in thermal contact with the integrated circuit;
A cover that accommodates the rotor, the stator, the substrate, and the heat sink;
The stator is
Stator core,
A coil attached to the stator core;
An insulating portion radially opposed to the coil;
A plurality of binding pins extending axially from the insulating portion to one side and penetrating the substrate in the axial direction, and a coil leader wire extending from the coil is wound;
The axial one end of the binding pin and the coil lead wire are fixed to the surface facing the one axial side of the substrate by soldering.
The heat sink is fixed to the cover,
The other axial end of the heat sink presses the integrated circuit toward the other axial side;
When viewed from the axial direction, the heat sink is located on an imaginary straight line passing through at least one of the binding pins and the central axis, and the heat sink is between the binding pin and the central axis on the imaginary straight line Positioned, motor. The motor according to claim 1, wherein
The motor according to the present invention, wherein the insulating portion has a substrate receiving portion that contacts the substrate from the other side in the axial direction. The motor according to claim 2, wherein
The motor includes a plurality of outer peripheral substrate receiving portions that contact an outer peripheral portion of a surface on the other side in the axial direction of the substrate. A motor according to claim 2 or 3, wherein
The motor includes a plurality of inner peripheral substrate receiving portions that contact the other surface of the substrate in the axial direction on the inner peripheral side with respect to the coil. The motor according to any one of claims 1 to 4, wherein
The number of coil leads of the coil is four,
The number of binding pins is four, a motor.

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