Motor device

Abstract

A motor device (11) has a motor (12), a circuit board (32), and motor terminals (24B) that electrically connect a power source and the motor via the circuit board. The motor includes a rotor (25) and a stator (23). The stator comprises a winding (23D). The motor terminals have a winding end (24Ba) connected to the winding and a board end (24Bb) connected to the circuit board. The circuit board has: through-holes (32A); and lands (32B), each of which is provided on the circumferential edge of a respective through-hole and electrically connected, via solder (23C), to a respective board end in a state of being inserted into the respective through-hole. The motor terminal includes a low-rigidity portion (24Bc) of lower rigidity compared to other portions, including the winding end and the board end.

Description

Motor device

[0001] The present disclosure relates to a motor device.

[0002] For example, Patent Document 1 discloses a motor device having a motor and a circuit board. The circuit board supplies power to the motor through U-phase, V-phase, and W-phase motor coils. Lead wires for each phase of the motor coil are connected to bus bars corresponding to each phase. The bus bars for each phase are fixed to the circuit board by soldering or the like.

[0003] Japanese Patent Application Laid-Open No. 2018-170895

[0004] As in Patent Document 1, the time required to solder the bus bars of each phase to the circuit board is proportional to the number of bus bars. The time required for this work necessarily includes the time required to heat the portions of the circuit board where the bus bars will be soldered. Therefore, there is a need to reduce the time required to heat the portions of the circuit board where the bus bars will be soldered.

[0005] A motor device according to one aspect of the present disclosure includes a motor, a circuit board configured to supply a drive current from a power source to the motor, and a motor terminal electrically connecting the power source and the motor via the circuit board. The motor includes a rotor and a stator disposed around the rotor. The stator includes a winding. The motor terminal has a winding end electrically connected to the winding and a board end electrically connected to the circuit board. The circuit board has a through hole through which the board end is inserted, and a land disposed around the through hole and electrically connected via solder to the board end when inserted into the through hole. The motor terminal includes a low-rigidity portion that is lower in rigidity than other portions including the winding end and the board end.

[0006] Fig. 4 is a cross-sectional view of a motor device according to a first embodiment cut in the axial direction. Fig. 5 is a cross-sectional view showing a main part of the motor device of Fig. 1. Fig. 6 is an axial cross-sectional view of a solder-fixed portion of the motor terminal in Fig. 2, and is an end view taken along line III-III in Fig. 2. Fig. 7 is a diagram explaining a method for manufacturing the busbar module of Fig. 3. Fig. 8 is a diagram explaining a process for forming the solder-fixed portion of the motor terminal in Fig. 2. Fig. 9 is a diagram explaining a motor terminal according to a second embodiment.

[0007] First Embodiment A motor device according to a first embodiment will now be described with reference to the drawings. As shown in Fig. 1, the motor device 11 is a mechanically and electrically integrated motor device in which a motor 12 and a motor control device 13 are integrated. The motor 12 is, for example, a three-phase brushless motor. The three phases are U-phase, V-phase, and W-phase. The motor control device 13 is provided at an end of the motor 12. The motor control device 13 independently controls the power supply to two winding groups.

[0008] <Regarding the Motor> The motor 12 includes a case 21 , a bearing holder 22 , a stator 23 , a bus bar module 24 , and a rotor 25 .

[0009] The case 21 has a peripheral wall having a circular cross-sectional shape and an end wall that closes a first end of the peripheral wall. The second end of the peripheral wall is open to the outside. The second end is the end opposite the first end of the peripheral wall. The first end of the peripheral wall is also the first end of the case 21. The second end of the peripheral wall is also the second end of the case 21. The case 21 has a first bearing 21A. The first bearing 21A is provided on the end wall of the first end of the case 21. The case 21 is made of a metal with excellent thermal conductivity, such as aluminum.

[0010] The bearing holder 22 is attached to the second end of the case 21. The bearing holder 22 is fitted inside the second end of the case 21. The bearing holder 22 has a second bearing 22A. The second bearing 22A is provided on the inner surface of the bearing holder 22. The inner surface is the surface of the bearing holder 22 that faces the rotor 25. The bearing holder 22 is made of a metal with excellent thermal conductivity, such as aluminum. The bearing holder 22 also functions as a heat sink that promotes heat dissipation.

[0011] The stator 23 is fitted into the inner circumferential surface of the case 21. The stator 23 includes a stator core 23A, a first insulator 23B, a second insulator 23C, a plurality of windings 23D, and a stator holding member 23E. The stator core 23A is a cylindrical body having a circular cross-sectional shape. The first insulator 23B is provided at a first end of the stator core 23A. The second insulator 23C is provided at a second end of the stator core 23A. The windings 23D are wound around the stator core 23A via the first insulator 23B and the second insulator 23C. The stator holding member 23E is a cylindrical body having a circular cross-sectional shape. The inner circumferential surface of the stator holding member 23E is attached to the outer circumferential surface of the stator core 23A. The stator 23 is supported inside the case 21 via a stator holding member 23E.

[0012] The busbar module 24 is disposed between the bearing holder 22 and the stator 23. The busbar module 24 is provided at an end of the stator 23. The end is the end of the stator 23 on the bearing holder 22 side. The busbar module 24 includes a plurality of metal busbars B and a resin busbar holder 24A. The busbar holder 24A is a cylindrical body with a circular cross-section. A portion of the bearing holder 22 where the second bearing 22A is provided is inserted into the busbar holder 24A without contacting the busbar holder 24A. Each busbar B is formed by plastically deforming a metal plate material punched into a predetermined shape. Each busbar B is held by the busbar holder 24A. Each busbar B corresponds to one of the three phases. Each busbar B is connected to an end of the winding 23D of the corresponding phase among the three phases.

[0013] Each bus bar B has a motor terminal 24B. The motor terminal 24B is flat. Each motor terminal 24B is part of each bus bar B and is disposed on the periphery of the bearing holder 22. Each motor terminal 24B is disposed radially outward from the outer circumferential surface of the stator 23. Each motor terminal 24B extends in the axial direction of the motor 12 and protrudes from the outer surface of the bus bar holder 24A so as to penetrate the bearing holder 22. The outer surface is the surface of the bus bar holder 24A that faces the bearing holder 22 in the axial direction. As described below, the motor terminals 24B are disposed in a row when viewed perpendicular to the axial direction of the motor 12. The tip of each motor terminal 24B penetrates the periphery of the bearing holder 22 in the axial direction without contacting the bearing holder 22. Three-phase AC power is supplied to each of the three-phase windings 23D via each motor terminal 24B, i.e., each bus bar B. The connection structure of each motor terminal 24B will be described in detail later.

[0014] The rotor 25 includes an output shaft 25A, a rotor core 25B, and a rotor magnet 25C. The output shaft 25A is rotatably supported via a first bearing 21A and a second bearing 22A. A first end of the output shaft 25A penetrates the end wall of the case 21 without contacting it and protrudes to the outside. A second end of the output shaft 25A extends toward the motor control device 13. The rotor core 25B is a cylindrical body with a circular cross section and is attached to the outer circumferential surface of the output shaft 25A. The rotor magnet 25C is a cylindrical body with a circular cross section and is attached to the outer circumferential surface of the rotor core 25B. The rotor core 25B and the rotor magnet 25C are disposed inside the stator core 23A. A small gap is formed between the outer circumferential surface of the rotor magnet 25C and the inner circumferential surface of the stator core 23A.

[0015] <Regarding the Motor Control Device> The motor control device 13 includes a control circuit board 31 , a power circuit board 32 , and a cover 33 .

[0016] The control circuit board 31 has electronic components for controlling the power supply to the motor 12. The control circuit board 31 is disposed so as to cover the outer surface of the bearing holder 22. The outer surface is the surface of the bearing holder 22 opposite to the rotor 25 side.

[0017] The power circuit board 32 has electronic components for supplying power to the motor 12 through control by the control circuit board 31. The power circuit board 32 is located axially outward of the control circuit board 31. That is, the power circuit board 32 is farther from the stator 23 in the axial direction of the motor 12 than the control circuit board 31. The power circuit board 32 is disposed so as to cover the control circuit board 31 and the outer surface of the bearing holder 22. The tip of each motor terminal 24B passes through the power circuit board 32 in the axial direction and is electrically connected to the power circuit board 32 by solder 24C.

[0018] The cover 33 has a peripheral wall having a rectangular cross-sectional shape and an end wall that closes a first end of the peripheral wall. A second end of the peripheral wall is open to the outside. The second end is an end opposite the first end of the peripheral wall. The cover 33 has a power connector 33A and a signal connector 33B. The power connector 33A and the signal connector 33B extend from the first end of the cover 33 in a direction opposite the control circuit board 31 and the power circuit board 32. The cover 33 is made of, for example, resin. The cover 33 is attached to the second end of the case 21. The cover 33 covers the second end of the case 21.

[0019] The power connector 33A has a power terminal and a ground terminal. The power terminal and the ground terminal are electrically connected to the power circuit board 32 by soldering. A mating power plug is fitted into the power connector 33A. The power plug is connected to a DC power source such as a battery via a power line. Power from the DC power source supplies drive current to the control circuit board 31 and the power circuit board 32 via the power terminal and the ground terminal.

[0020] The signal connector 33B has a signal terminal. A mating signal plug is fitted into the signal connector 33B. The signal plug is connected to a higher-level control device via a signal line. Signals are exchanged between the control circuit board 31 and the higher-level control device via the signal terminal.

[0021] <Regarding the motor terminal connection structure> As shown in Figures 2 and 3, the bearing holder 22 has terminal insertion holes 22B. The terminal insertion holes 22B are stepped holes with a rectangular cross section. The terminal insertion holes 22B are arranged on the periphery of the bearing holder 22. The terminal insertion holes 22B penetrate the bearing holder 22 in the axial direction, which is the thickness direction. Three motor terminals 24B arranged in a row can be inserted through the terminal insertion holes 22B.

[0022] The bus bar holder 24A has a plurality of surrounding portions 24D. Each surrounding portion 24D at least partially surrounds a portion of the corresponding motor terminal 24B, including the winding end 24Ba. The winding end 24Ba is electrically connected to the corresponding winding 23D. The motor terminal 24B starts at the winding end 24Ba and rises from the outer surface of the bus bar holder 24A toward the bearing holder 22. Each surrounding portion 24D is a stepped columnar body with a rectangular cross section. The surrounding portion 24D is, for example, a resin portion made of resin.

[0023] Each motor terminal 24B extends from the outer surface of the bearing holder 22 toward the power circuit board 32, passing through the terminal insertion hole 22B. A board end 24Bb, which is the tip of each motor terminal 24B, passes through a through hole 32A provided in the power circuit board 32 and protrudes from the surface of the power circuit board 32 that faces the inner surface of the cover 33. The through hole 32A penetrates the power circuit board 32 in the thickness direction.

[0024] The power circuit board 32 has a land 32B. The land 32B is a portion of the power circuit board 32 that covers the portion where the through hole 32A is formed. The land 32B is, for example, copper foil and forms part of the pattern wiring of the power circuit board 32. The land 32B has a cylindrical portion 32Ba and two flange portions 32Bb. The cylindrical portion 32Ba is a cylindrical portion that covers the entire inner surface of the through hole 32A. The flange portions 32Bb are annular portions that cover the periphery of the through hole 32A on the front and back surfaces of the power circuit board 32. The flange portions 32Bb extend radially outward from both axial ends of the cylindrical portion 32Ba. The inner diameters of the cylindrical portion 32Ba and the through hole 32A are sized so that the motor terminal 24B inserted through the cylindrical portion 32Ba does not directly contact the cylindrical portion 32Ba. Of the lands 32B, a flange portion 32Bb1 on the front surface side of the power circuit board 32 is electrically connected by solder 24C to a portion including a board end 24Bb of the corresponding motor terminal 24B.

[0025] For example, as shown in Figure 3, three motor terminals 24B arranged in a row within the terminal insertion hole 22B are individually inserted into corresponding through holes 32A out of three through holes 32A arranged in a row.

[0026] The winding end 24Ba is surrounded by an enclosing portion 24D and is partially exposed from the enclosing portion 24D. The board end 24Bb is inserted through the through-hole 32A and fixed to the land 32B with solder 24C. A low-rigidity portion 24Bc is provided between the winding end 24Ba and the board end 24Bb. The winding end 24Ba and the board end 24Bb are connected via the low-rigidity portion 24Bc. The thickness of the motor terminal 24B is uniform along the axial direction. The width of the motor terminal 24B varies depending on the location. The width Wa of the winding end 24Ba and the width Wb of the board end 24Bb are equal to each other. The width Wc of the low-rigidity portion 24Bc is smaller than the widths Wa and Wb of the winding end 24Ba and the board end 24Bb. The low-rigidity portion 24Bc is a portion whose width is smaller than the winding end 24Ba and the substrate end 24Bb by being recessed on both sides in the width direction relative to the winding end 24Ba and the substrate end 24Bb.

[0027] Therefore, the low-rigidity portion 24Bc has lower rigidity than other portions, including the winding end 24Ba and the board end 24Bb. In particular, the low-rigidity portion 24Bc has low rigidity against deformation in the thickness direction. As a result, in the case of FIG. 2, the motor terminal 24B is configured to be easily tilted in the thickness direction starting from the low-rigidity portion 24Bc. The width of the low-rigidity portion 24Bc is within a range experimentally determined, taking into account the overall rigidity and electrical resistance of the motor terminal 24B, so that the overall rigidity is not too low and the electrical resistance is not too high. The cross-sectional area of ​​the low-rigidity portion 24Bc is smaller than the cross-sectional area of ​​other portions, including the winding end 24Ba and the board end 24Bb.

[0028] Between the low-rigidity portion 24Bc and the surrounding portion 24D, there is the winding end 24Ba, specifically, the portion of the winding end 24Ba that is not surrounded by the surrounding portion 24D. The low-rigidity portion 24Bc is closer to the winding end 24Ba than the power circuit board 32. That is, the axial distance La of the first portion from the surrounding portion 24D to the low-rigidity portion 24Bc is shorter than the axial distance Lb of the second portion from the power circuit board 32 to the low-rigidity portion 24Bc. The axial length Lc of the low-rigidity portion 24Bc is greater than both the distances La and Lb.

[0029] For example, as shown in FIG. 4 , a bus bar module 24 is manufactured by inserting a bus bar B. The mold M has a motor terminal molding portion Ma and a holder molding portion Mb. The motor terminal molding portion Ma forms a space extending in one direction while maintaining constant dimensions in the thickness direction, which is the front-to-back direction of the paper in FIG. 4 , and the width direction, which is the left-to-right direction in FIG. 4 . The thickness direction dimension of the motor terminal molding portion Ma is approximately the same as the thickness of the bus bar B. The width direction dimension of the motor terminal molding portion Ma is approximately the same as the width of the bus bar B, i.e., widths Wa and Wb. The holder molding portion Mb forms a space that expands so that its dimensions in the thickness direction and width direction are larger than those of the motor terminal molding portion Ma.

[0030] The bus bar B is inserted into the mold M from the second end Bb, which becomes the board end 24Bb of the motor terminal 24B. The bus bar B is inserted so that the first end Ba, which becomes the winding end 24Ba of the motor terminal 24B, is positioned in the holder molding portion Mb. In this case, the entire connecting portion Bc, which becomes the low-rigidity portion 24Bc of the motor terminal 24B, is present within the space formed by the motor terminal molding portion Ma. Furthermore, the portion of the first end Ba of the bus bar B that is present within the space formed by the motor terminal molding portion Ma is within a range of a distance La in the axial direction of the second portion. Therefore, when the bus bar B is inserted into the mold M, the space formed by the motor terminal molding portion Ma is sealed by the first end Ba.

[0031] Resin material is then poured into the holder molding portion Mb. The space formed by the motor terminal molding portion Ma is sealed by the first end portion Ba, preventing the resin material from flowing in. As a result, the portions of the motor terminal 24B that are not covered by resin material, i.e., a part of the winding end 24Ba, the board end 24Bb, and the low-rigidity portion 24Bc, are formed in the space formed by the motor terminal molding portion Ma. Additionally, the resin material forms an enclosure portion 24D in the space formed by the holder molding portion Mb.

[0032] <Operation of the Present Embodiment> When manufacturing the motor device 11, a process for fixing the motor terminals 24B to the power circuit board 32 with solder 24C is essential. The more motor terminals 24B there are and the more winding groups there are, the longer this process takes. However, there is a limit to the time required to manufacture the motor device 11. Therefore, during the manufacture of the motor device 11, the time that can be spent on the process for fixing the motor terminals 24B to the power circuit board 32 with solder 24C is very short, for example, on the order of several tens of seconds.

[0033] 5, the process of fixing the motor terminal 24B can be performed after the board end 24Bb of the motor terminal 24B is inserted into the through-hole 32A of the power circuit board 32. Then, a soldering iron T is used to heat the land 32B where the board end 24Bb is fixed with solder 24C. The soldering iron T is pressed against the board end 24Bb.

[0034] 5, in this embodiment, the motor terminal 24B has a low-rigidity portion 24Bc, which makes it easy to deform through the low-rigidity portion 24Bc. When the motor terminal 24B is fixed to the power circuit board 32 with solder 24C, the board end 24Bb is inserted into the through-hole 32A, and the motor terminal 24B is pressed down by the soldering iron T against the land 32B.

[0035] In this case, the soldering iron T can be brought into direct contact with a portion of the land 32B, and can also be brought into indirect contact with the remaining portion of the land 32B via the board edge 24Bb pressed against it. This allows the land 32B to be heated simultaneously from multiple locations, including the portion that the soldering iron T comes into direct contact with and the portion that the soldering iron T comes into indirect contact with via the board edge 24Bb. Heat can be transferred to the entire land 32B in a shorter time than when the land 32B is heated only from the portion that the soldering iron T comes into direct contact with. In other words, the time required to heat the land 32B can be shortened.

[0036] Thereafter, the board end 24Bb is fixed to the heated land 32B by the solder 24C. In this case, the motor terminal 24B is fixed in place as it is by releasing the pressure applied by the soldering iron T.

[0037] <Effects of this embodiment> (1-1) The time required to heat the lands 32B can be reduced, which reduces the time required for the process of fixing the motor terminals 24B to the power circuit board 32 with solder 24C. Therefore, the motor device 11 can be manufactured efficiently within a limited time frame.

[0038] (1-2) In the flat motor terminal 24B, the width Wc of the low-rigidity portion 24Bc is smaller than the widths Wa and Wb of other portions, including the winding end 24Ba and the board end 24Bb, which makes it easier to form the low-rigidity portion 24Bc.

[0039] (1-3) The low-rigidity portion 24Bc can be visually distinguished from other portions. This makes it easy to identify the portion of the motor terminal 24B where the low-rigidity portion 24Bc is located. In other words, since it is easy to identify the portion of the motor terminal 24B that serves as the starting point for deformation, it is easy to imagine the manner in which the deformation will occur.

[0040] (1-4) The low-rigidity portion 24Bc is formed so that the winding end 24Ba is interposed between the low-rigidity portion 24Bc and the surrounding portion 24D. For example, when insert-molding the busbar module 24, the space formed by the motor terminal molding portion Ma can be sealed with the first end Ba, which becomes the winding end 24Ba. This makes it possible to easily form the portions of the motor terminal 24B that are not covered by resin material, i.e., part of the winding end 24Ba, the board end 24Bb, and the low-rigidity portion 24Bc, when insert-molding the busbar module 24. This is therefore effective in facilitating the process of manufacturing the busbar module 24, i.e., insert-molding.

[0041] (1-5) The cross-sectional area of ​​the low-rigidity portion 24Bc is smaller than the cross-sectional areas of other portions, including the winding end 24Ba and the board end 24Bb. Considering that thermal resistance in heat conduction is proportional to the length of an object and inversely proportional to the cross-sectional area of ​​the object, the thermal resistance of the low-rigidity portion 24Bc is higher than that of the winding end 24Ba and the board end 24Bb. Based on this premise, the low-rigidity portion 24Bc is a portion between the winding end 24Ba and the board end 24Bb, and the distance La from the enclosure 24D to the low-rigidity portion 24Bc is smaller than the distance Lb from the power circuit board 32 to the low-rigidity portion 24Bc. In other words, the low-rigidity portion 24Bc is formed so as to be closer to the winding end 24Ba than the power circuit board 32. As a result, heat from the motor terminal 24B is dissipated through the low-rigidity portion 24Bc and the enclosure 24D by bringing the portion with high thermal resistance closer to the resin enclosure 24D. Therefore, when the motor device 11 is driven, the motor terminal 24B can be effectively prevented from becoming too hot.

[0042] Second Embodiment A motor device according to a second embodiment will be described below with reference to the drawings, focusing on the differences from the first embodiment. For ease of explanation, the same components as those in the first embodiment will be assigned the same reference numerals as those in the first embodiment, and their description will be omitted.

[0043] As shown in Fig. 6, the motor terminal 24B of this embodiment is configured to have a low-rigidity portion 24Bd instead of a low-rigidity portion 24Bc. Specifically, the thickness of the motor terminal 24B is constant along the axial direction, and the width of the motor terminal 24B is constant along the axial direction. The widths of the winding end 24Ba, the board end 24Bb, and the low-rigidity portion 24Bd are all the same.

[0044] The low-rigidity portion 24Bd has a slit S. The slit S is a portion cut out of the motor terminal 24B. In other words, the slit S is a long hole that penetrates the low-rigidity portion 24Bd in the thickness direction and extends axially at the center of the low-rigidity portion 24Bd in the width direction. The axial length Ld of the low-rigidity portion 24Bd is greater than both the distances La and Lb. As a result, the cross-sectional area of ​​the low-rigidity portion 24Bd in the axial direction of the motor terminal 24B is smaller than the cross-sectional area of ​​other portions, including the winding end 24Ba and the board end 24Bb. The width and axial length of the slit S are within a range experimentally determined from the viewpoint of not excessively reducing the overall rigidity and not excessively increasing the electrical resistance, taking into account the overall rigidity and electrical resistance of the motor terminal 24B.

[0045] As described above, the low-rigidity portion 24Bd has lower rigidity than other portions including the winding end 24Ba and the board end 24Bb, as in the first embodiment, which makes the motor terminal 24B more likely to tilt in the thickness direction starting from the low-rigidity portion 24Bd.

[0046] <Effects of this embodiment> According to the second embodiment described above, the effects of the first embodiment and effects equivalent to (1-1), (1-3) to (1-5) can be obtained, and further the effects described below can be obtained.

[0047] (2-1) In the flat motor terminal 24B, the low-rigidity portion 24Bd is a portion having a slit S formed by cutting out a part of the motor terminal 24B. This makes it possible to easily form the low-rigidity portion 24Bc.

[0048] Other Embodiments The above-described embodiments may be modified as follows: The following other embodiments may be combined with each other within the scope of technical inconsistency.

[0049] In the first embodiment, the low-rigidity portion 24Bc may be closer to the power circuit board 32 than the winding end 24Ba. That is, the axial distance La of the first portion from the surrounding portion 24D to the low-rigidity portion 24Bc may be greater than the axial distance Lb of the second portion from the power circuit board 32 to the low-rigidity portion 24Bc. The other embodiments described herein are also applicable to the second embodiment.

[0050] In the first embodiment, the low-rigidity portion 24Bc may be formed to reach the through-hole 32A of the power circuit board 32. The other embodiments described herein are also applicable to the second embodiment.

[0051] In the first embodiment, the surrounding portion 24D may be configured to surround the entire winding end 24Ba. That is, the axial distance Lb of the first portion from the surrounding portion 24D to the low-rigidity portion 24Bc may be zero, and the low-rigidity portion 24Bc may be disposed adjacent to the surrounding portion 24D. The other embodiments described herein are also applicable to the second embodiment.

[0052] In the first embodiment, the length Lc of the low-rigidity portion 24Bc in the axial direction may be equal to or smaller than the distance La. Furthermore, the length Lc of the low-rigidity portion 24Bc in the axial direction may be equal to or smaller than the distance Lb.

[0053] In the first embodiment, the low-rigidity portion 24Bc may be formed so as to be recessed only on one side in the width direction relative to the winding end 24Ba and the board end 24Bb. In the first embodiment, the low-rigidity portion 24Bc may be a portion where the thickness of the motor terminal 24B is smaller than other portions. In this case, the width of the motor terminal 24B may be constant along the axial direction. In other words, the thickness of the low-rigidity portion 24Bc may be smaller than the thickness of the winding end 24Ba and the board end 24Bb.

[0054] In the second embodiment, the length Ld of the low-rigidity portion 24Bd in the axial direction may be equal to or smaller than the distance La. Furthermore, the length Lc of the low-rigidity portion 24Bd in the axial direction may be equal to or smaller than the distance Lb.

[0055] In the second embodiment, for example, a plurality of holes arranged in a line along the axial direction may be provided instead of the slits S. Also, for example, a mesh formed by a collection of a plurality of holes may be provided instead of the slits S.

[0056] In each embodiment, the land 32B may be a type that does not have the cylindrical portion 32Ba. In this case, the land 32B may be provided only on the surface of the power circuit board 32 to which the motor terminal 24B is fixed by the solder 24C.

[0057] The embodiments are not limited to fixing the motor terminal 24B to the power circuit board 32 with solder 24C, and may be applied to fixing a predetermined terminal to a predetermined circuit board. In the embodiments, the motor 12 may have two or more winding groups.

[0058] In each embodiment, if the components mounted on the control circuit board 31 can be mounted on the power circuit board 32, the control circuit board 31 may be omitted. In each embodiment, the motor device 11 may be used, for example, as a drive source for an electric power steering device. In this case, the motor 12 functions as an assist motor that generates a steering assist force. The motor control device 13 controls the motor 12 as an assist motor.

[0059] In each embodiment, motor device 11 may be used, for example, as a drive source for a reaction mechanism or a steering mechanism in a steer-by-wire steering device. In this case, motor 12 functions as a reaction motor that generates a steering reaction force, or a steering motor that generates a steering force for steering the steered wheels of the vehicle. Motor control device 13 controls motor 12 as a reaction motor or a steering motor.

[0060] In each embodiment, the motor device 11 is not limited to being used in a vehicle. Each embodiment is effective regardless of the use of the motor device 11 in that it allows the motor device 11 to be suitably manufactured within a limited time.

Claims

1. A motor device having a motor, a circuit board configured to supply a drive current from a power source to the motor, and a motor terminal electrically connecting the power source and the motor via the circuit board, wherein the motor includes a rotor and a stator arranged around the rotor, the stator has a winding, the motor terminal has a winding end electrically connected to the winding and a board end electrically connected to the circuit board, the circuit board has a through hole through which the board end is inserted, and a land arranged on the periphery of the through hole and electrically connected via solder to the board end while inserted into the through hole, and the motor terminal includes a low-rigidity portion that is lower in rigidity than other portions including the winding end and the board end.

2. The motor device according to claim 1, wherein the motor terminal is flat, and the low-rigidity portion is a portion having a smaller width than the other portions.

3. A motor device according to claim 1, wherein the motor terminal is flat, and the low-rigidity portion has the same width as the other portions and is a portion cut out midway in the width direction.

4. A motor device according to any one of claims 1 to 3, wherein the winding end further comprises a resin portion that partially surrounds the winding end, and a portion of the winding end is interposed between the low-rigidity portion and the resin portion.

5. A motor device as described in claim 4, wherein the low-rigidity portion is disposed between the winding end and the board end, and the distance from the resin portion to the low-rigidity portion is shorter than the distance from the circuit board to the low-rigidity portion.

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