Electronic control device and motor device

Abstract

An electronic control device (13) is provided with a substrate (32) and a connector assembly (31) facing the substrate. The connector assembly has: a body (41) configured to be attached to an attachment target (12); and terminals (42-45) held by the body. The body has: configured connectors (41B, 41C); a first end surface (S1) on which the connectors are provided; and a second end surface (S2) facing the substrate. The terminals have: first end parts disposed inside the connectors; and second end parts connected to the substrate in a state of penetrating the substrate. The second end surface is provided with: a plurality of fastening parts (48A-48D) to which the substrate is fixed; and ribs (51-54) that connect the plurality of fastening parts to each other.

Description

Electronic control device and motor device

[0001] The present disclosure relates to an electronic control device and a motor device.

[0002] For example, the motor device of Patent Document 1 has a control unit and a motor. The control unit is provided at the end of the motor. The control unit has a control section, a cover, and a connector section. The control section has a substrate fixed to the end of the motor with screws and various electronic components provided on the substrate. The cover covers the control section.

[0003] The connector section has a base section, a connector, and a plurality of terminals. The base section is fixed to the substrate with screws. A part of the base section is arranged outside the cover through an opening of the cover. The connector protrudes in the axial direction of the motor from the portion of the base section arranged outside the cover. The connector holds a plurality of terminals. The terminals are connected to the substrate.

[0004] An external connector of an external cable is connected to the connector section. The insertion / removal direction and the frontage direction of the connector are in the axial direction of the motor. The insertion / removal direction is the direction when inserting / removing the external connector into / from the connector, and coincides with the frontage direction of the connector. The frontage is an opening provided at the end of the connector on the side opposite to the base section.

[0005] Japanese Unexamined Patent Application Publication No. 2019 - 187078

[0006] The motor device of Patent Document 1 has the following concerns. For example, when inserting / removing the external connector into / from the connector, there is a risk that stress may concentrate on the connection portion between the terminal and the substrate. Due to such concentration of stress, there is a concern that a good connection between the terminal and the substrate may be impaired.

[0007] An electronic control device according to one aspect of the present disclosure comprises a substrate and a connector assembly facing the substrate. The connector assembly has a body made of synthetic resin configured to be attached to an object and a terminal held by the body. The body has a connector configured to mate with a mating connector, a first end face on which the connector is provided, and a second end face opposite the first end face and facing the substrate. The terminal has a first end positioned inside the connector and a second end connected to the substrate while penetrating the substrate in the thickness direction. The second end face is provided with a plurality of fastening portions to which the substrate is fixed and ribs connecting the plurality of fastening portions to each other.

[0008] Figure 1 is a perspective view showing the external appearance of a motor device according to one embodiment. Figure 2 is a perspective view of the motor device of Figure 1 in disassembled form. Figure 3 is a cross-sectional view of the connector assembly of Figure 2. Figure 4 is a perspective view of the connector assembly of Figure 2. Figure 5 is a plan view of the connector assembly of Figure 2. Figure 6 is a front view of the power terminal and ground terminal of Figure 2. Figure 7 is a partial cross-sectional view showing the main part of the connector assembly of Figure 2. Figure 8 is a cross-sectional view of the connector assembly of Figure 2. Figure 9 is a partial cross-sectional view showing the main part of the connector assembly of Figure 2. Figure 10A is a front view of the power terminal and ground terminal of Figure 2 before elastic deformation, and Figure 10B is a front view of the power terminal and ground terminal of Figure 2 after elastic deformation. Figure 11A is a cross-sectional view of the substrate before the power terminal or ground terminal according to another embodiment is connected, and Figure 11B is a cross-sectional view of the substrate after the power terminal or ground terminal according to another embodiment is connected.

[0009] A motor device 11 according to one embodiment will be described. The motor device 11 is mounted, for example, on the steering system of a vehicle. The steering system includes an electric power steering system and a steer-by-wire steering system.

[0010] <Overall Configuration> As shown in Figure 1, the motor device 11 includes a motor 12 and an electronic control device 13. The motor 12 is, for example, a three-phase brushless motor. The three phases are U-phase, V-phase, and W-phase. The motor 12 has two sets of windings. The electronic control device 13 is provided at the axial end of the motor 12. The electronic control device 13 independently controls the power supply to the two sets of windings.

[0011] <Motor 12> As shown in Figure 2, the motor 12 has a case 12A. The case 12A is a cylindrical metal body with a circular cross-section. Inside the case 12A are a stator, a busbar module, and a rotor. The stator has a core and a plurality of windings. The core is a hollow cylindrical body with a circular cross-section and is fitted to the inner surface of the case 12A. The plurality of windings are wound around the core via an insulator. The busbar module has a holder made of synthetic resin and a plurality of busbars held in the holder. The busbars correspond to each of the three phases. One end of a winding is connected to each busbar. The rotor is inserted into the stator and the busbar module without contact. The rotor has an output shaft 12B and a magnet fixed to the outer surface of the output shaft 12B. The magnet is a cylindrical body with a circular cross-section. The output shaft 12B is rotatably supported by bearings on the inner circumferential surface of the case 12A. The motor 12 has a first end on the side from which the output shaft 12B protrudes, and a second end on the opposite side from the first end.

[0012] A substrate housing section 21 is provided at the second end of the motor 12. The substrate housing section 21 is made of metal and is integrally provided with the case 12A. The substrate housing section 21 is a rectangular box-shaped body having an opening 21A. The opening 21A opens in the direction opposite to the direction in which the output shaft 12B of the motor 12 protrudes. The substrate housing section 21 has a protruding portion 21B. The protruding portion 21B is the part of the substrate housing section 21 that protrudes to the side of the motor 12. The side is perpendicular to the axial direction of the motor 12. The substrate housing section 21 has a fitting hole 21C. The fitting hole 21C is provided in the end wall of the protruding portion 21B. The fitting hole 21C penetrates the end wall of the protruding portion 21B in the axial direction of the motor 12.

[0013] A heat sink 22 is provided at the second end of the motor 12. The heat sink 22 is a cylindrical metal body with a circular cross-section. The metal is a metal with excellent thermal conductivity, such as aluminum. The heat sink 22 is positioned coaxially with respect to the axis of the motor 12. The heat sink 22 penetrates the end wall of the substrate housing 21 in the axial direction of the motor 12. A portion of the heat sink 22 is exposed inside the substrate housing 21.

[0014] The heat sink 22 is provided with three first motor terminals 23A. The three first motor terminals 23A correspond to the three phase windings that constitute the first winding group. Each of the first motor terminals 23A is part of a busbar. Inside the case 12A, one end of the first winding of each phase is connected to the busbar of the corresponding phase. The first motor terminals 23A penetrate the heat sink 22 in the axial direction of the motor 12 via an insulating member. The three first motor terminals 23A are arranged in a line tangentially to the contour of the motor 12 when viewed from the axial direction of the motor 12.

[0015] The heat sink 22 is provided with three second motor terminals 23B. The three second motor terminals 24A correspond to the three phase windings that constitute the second winding group. Each of the second motor terminals 23B is part of a busbar. Inside the case 12A, one end of the second winding of each phase is connected to the busbar of the corresponding phase. The second motor terminals 23B penetrate the heat sink 22 in the axial direction of the motor 12 via an insulating member. The three second motor terminals 23B are arranged in a line tangentially to the contour of the motor 12 when viewed from the axial direction of the motor 12.

[0016] The ends of the heat sink 22, from which the first motor terminal 23A and the second motor terminal 23B protrude, are exposed inside the substrate housing 21. <Electronic control unit 13> As shown in Figure 2, the electronic control unit 13 includes a connector assembly 31, a substrate 32, and a cover 33.

[0017] The connector assembly 31 has a body 41 made of synthetic resin. The body 41 includes a base 41A, a first power connector 41B, a second power connector 41C, a first signal connector 41D, and a second signal connector 41E.

[0018] The base 41A is, for example, a plate-like body having a rectangular cross-sectional shape, and extends in a direction perpendicular to the axial direction of the motor 12. The rectangle includes a rectangle or a trapezoid. The base 41A has a first end face S1 facing in the opposite direction to the opening 21A of the substrate housing 21, and a second end face S2 facing in the opposite direction to the first end face S1, i.e., in the same direction as the opening 21A of the substrate housing 21. The direction opposite to the opening 21A of the substrate housing 21 is downward in Figure 2. The direction in the same direction as the opening 21A of the substrate housing 21 is upward in Figure 2. The first end face S1 of the base 41A is also the first end face S1 of the body 41, and the second end face S2 of the base 41A is also the second end face S2 of the body 41.

[0019] The first power connector 41B is provided on the first end face S1 of the base 41A. The first power connector 41B is a cylindrical body that extends from the first end face S1 of the base 41A in the axial direction of the motor 12. The first power connector 41B has an opening in the direction that the first end face S1 of the base 41A faces. The first power connector 41B is a so-called male connector.

[0020] The first power connector 41B is mated with the first mating connector, which is a so-called female connector. The first power connector 41B is mated inside the first mating connector. The first mating connector is connected via first wiring to a DC power source such as a battery located outside the motor device 11. The first power connector 41B is a first power connector for supplying power from the DC power source to the circuit board 32.

[0021] The second power connector 41C is provided on the first end face S1 of the base 41A. The second power connector 41C is a so-called male connector having the same configuration as the first power connector 41B. The first power connector 41B and the second power connector 41C are spaced apart in the direction of the long side of the base 41A. The direction of the long side is the direction in which the length of the side of the base 41A is longer.

[0022] The second power connector 41C is mated with a second mating connector, which is a so-called female connector. The second power connector 41C is mated inside the second mating connector. The second mating connector is connected via second wiring to a DC power source, such as a battery, located outside the motor device 11. The second power connector 41C is a second power connector for supplying power from the DC power source to the circuit board 32.

[0023] The first signal connector 41D is provided on the first end face S1 of the base 41A. The first signal connector 41D is positioned between the first power connector 41B and the second power connector 41C in the long-side direction of the base 41A. The first signal connector 41D is a cylindrical body that extends from the first end face S1 of the base 41A in the axial direction of the motor 12. The first signal connector 41D opens in the direction that the first end face S1 of the base 41A faces. The third connector 41C is a so-called male connector.

[0024] The first signal connector 41D is mated with a third mating connector, which is a so-called female connector. The first signal connector 41D is mated inside the third mating connector. The third mating connector is connected via a third wiring to a vehicle control device located outside the motor device 11. The first signal connector 41D is a first signal connector for sending and receiving signals between the circuit board 32 and the vehicle control device.

[0025] The second signal connector 41E is provided on the first end face S1 of the base 41A. The second signal connector 41E is a so-called male connector having the same configuration as the first signal connector 41D. The second signal connector 41E is positioned between the second power connector 41C and the first signal connector 41D in the long side direction of the base 41A.

[0026] The second signal connector 41E is mated with its mating partner, the fourth mating connector. The fourth mating connector is a so-called female connector. The second signal connector 41E is mated inside the fourth mating connector. The fourth mating connector is connected via a fourth wiring to a vehicle control device located outside the motor device 11. The second signal connector 41E is a second signal connector for sending and receiving signals between the circuit board 32 and the vehicle control device.

[0027] The connector assembly 31 has a first power terminal 42 and a first ground terminal 43. The first power terminal 42 is provided along a path that extends from inside the first power connector 41B and penetrates the base 41A in the axial direction of the motor 12. The first end of the first power terminal 42 is located inside the first power connector 41B. The second end of the first power terminal 42 is upright with respect to the second end face S2 of the base 41A. The first ground terminal 43 is provided in the same manner as the first power terminal 42. The first power terminal 42 and the first ground terminal 42 are spaced apart in the long side direction of the base 41A.

[0028] The connector assembly 31 has a second power terminal 44 and a second ground terminal 45. The second power terminal 44 is provided along a path that extends from inside the second power connector 41C and penetrates the base 41A in the axial direction of the motor 12. The first end of the second power terminal 44 is located inside the second power connector 41C. The second end of the second power terminal 44 is upright with respect to the second end face S2 of the base 41A. The second ground terminal 45 is provided in the same manner as the second power terminal 44. The second power terminal 44 and the second ground terminal 45 are spaced apart in the long side direction of the base 41A.

[0029] The connector assembly 31 has a plurality of first signal terminals 46. The first signal terminals 46 are provided along a path that extends from inside the first signal connector 41D and penetrates the base 41A in the axial direction of the motor 12. The first end of the first signal terminal 46 is located inside the first signal connector 41D. The second end of the first signal terminal 46 is upright with respect to the second end face S2 of the base 41A. The plurality of first signal terminals 46 are arranged at intervals along the long side of the base 41A.

[0030] The connector assembly 31 has a plurality of second signal terminals 47. The second signal terminals 47 are provided along a path that extends from inside the second signal connector 41E and penetrates the base 41A in the axial direction of the motor 12. The first end of the second signal terminal 47 is located inside the second signal connector 41E. The second end of the second signal terminal 47 is upright with respect to the second end face S2 of the base 41A. The plurality of second signal terminals 47 are arranged at intervals along the long side of the base 41A.

[0031] The body 41 has a first fastening portion 48A, a second fastening portion 48B, a third fastening portion 48C, and a fourth fastening portion 48D. The first to fourth fastening portions 48A to 48D are each parts of the connector assembly 31 that supports the substrate 32. The first to fourth fastening portions 48A to 48D are each cylindrical bodies having a circular cross-sectional shape and extending in the axial direction of the motor 12. The first to fourth fastening portions 48A to 48D are arranged at intervals along the periphery of the second end face S2 of the base 41A.

[0032] The first fastening portion 48A and the second fastening portion 48B are spaced apart along the first of the two long sides of the base 41A. The third fastening portion 48C and the fourth fastening portion 48D are spaced apart along the second of the two long sides of the base 41A. The distance between the third fastening portion 48C and the fourth fastening portion 48D, which are spaced along the second long side, is longer than the distance between the first fastening portion 48A and the second fastening portion 48B, which are spaced along the first long side.

[0033] The body 41 has a first positioning pin portion 49A and a second positioning pin portion 49B. The first positioning pin portion 49A is a two-tiered columnar body with a circular cross-sectional shape and extends in the axial direction of the motor 12. The first positioning pin portion 49A has a base portion and a tip portion which has a smaller diameter than the base portion. The base portion is the end of the first positioning pin portion 49A that is closer to the base 41A. The tip portion is the end of the first positioning pin portion 49A that is further away from the base 41A. The second positioning pin portion 49B has the same shape as the first positioning pin portion 49A. The first positioning pin portion 49A is positioned to correspond to the first of the two short sides of the base 41A. The second positioning pin portion 49B is positioned to correspond to the second of the two short sides of the base 41A.

[0034] The connector assembly 31 is attached to the substrate housing 21 of the motor 12. The first power connector 41B, the second power connector 41C, the first signal connector 41D, and the second signal connector 41E are inserted into the opening 21A of the substrate housing 21. The peripheral edge of the base 41A is maintained in contact with the peripheral edge of the fitting hole 21C in the end wall of the substrate housing 21 in the axial direction of the motor 12. The first power connector 41B, the second power connector 41C, the first signal connector 41D, and the second signal connector 41E protrude from the end wall of the substrate housing 21 in the direction opposite to the opening 21A of the substrate housing 21. The end of the connector assembly 31 where the first to fourth fastening portions 48A to 48D and the first and second positioning pin portions 49A and 49B are located is exposed inside the substrate housing 21.

[0035] The circuit board 32 is housed inside the circuit board housing 21. The outer contour shape of the circuit board 32 corresponds to the inner contour shape of the circuit board housing 21 when viewed from the axial direction of the motor 12. The circuit board 32 is positioned overlapping the end of the heat sink 22 exposed inside the circuit board housing 21 and the end of the connector assembly 31 exposed inside the circuit board housing 21. The circuit board 32 is fixed to the first to fourth fastening portions 48A to 48D of the connector assembly 31 by screws 50. The screws 50 pass through the circuit board 32 and are tightened into the first to fourth fastening portions 48A to 48D, respectively. The circuit board 32 is maintained in a position perpendicular to the axial direction of the motor 12.

[0036] The tips of the first and second positioning pin portions 49A and 49B are inserted into corresponding positioning holes in the substrate 32. This positions the connector assembly 31 relative to the substrate 32. The positioning holes are through holes that penetrate the substrate 32 in the thickness direction. The inner diameter of the positioning holes is approximately the same as, or slightly larger than, the outer diameter of the tips of the first and second positioning pin portions 49A and 49B. The peripheral edges of the positioning holes in the substrate 32 come into contact with the bases of the first and second positioning pin portions 49A and 49B, restricting the movement of the substrate 32 toward the base 41A. In addition, the outer circumferential surfaces of the tips of the first and second positioning pin portions 49A and 49B come into contact with the inner circumferential surface of the positioning holes, restricting movement in a direction intersecting the axial direction of the motor 12.

[0037] The second end of the first power terminal 42 is inserted into the corresponding first power terminal hole of the substrate 32. The second end of the first ground terminal 43 is inserted into the corresponding first ground terminal hole of the substrate 32. Both the first power terminal hole and the first ground terminal hole are through holes that penetrate the substrate 32 in the thickness direction. The first power terminal hole constitutes the first power terminal connection portion. The first power terminal connection portion is the part of the substrate 32 to which the first power terminal 42 is connected.

[0038] The second end of the second power terminal 44 is inserted into the corresponding second power terminal hole of the circuit board 32. The second end of the second ground terminal 45 is inserted into the corresponding second ground terminal hole of the circuit board 32. Both the second power terminal hole and the second ground terminal hole are through holes that penetrate the circuit board 32 in the thickness direction. The second power terminal hole constitutes the second power terminal connection section. The second power terminal connection section is the portion of the circuit board 32 to which the second power terminal 44 is connected.

[0039] Multiple first signal terminals 46 are each inserted into corresponding first signal terminal holes in the substrate 32. Multiple second signal terminals 47 are each inserted into corresponding second signal terminal holes in the substrate 32. Both the first and second signal terminal holes are through holes that penetrate the substrate 32 in the thickness direction. The first signal terminal holes constitute the first signal terminal connection section. The first signal terminal connection section is the portion of the substrate 32 to which the first signal terminals 46 are connected. The second signal terminal holes constitute the second signal terminal connection section. The second signal terminal connection section is the portion of the substrate 32 to which the second signal terminals 47 are connected.

[0040] Multiple first motor terminals 23A are each inserted into corresponding first motor terminal holes in the substrate 32. Multiple second motor terminals 23B are each inserted into corresponding second motor terminal holes in the substrate 32. Both the first motor terminal holes and the second motor terminal holes are through holes that penetrate the substrate 32 in the thickness direction. The first motor terminal holes constitute the first motor terminal connection portion. The first motor terminal connection portion is the part of the substrate 32 to which the first motor terminals 23A are connected. The second motor terminal holes constitute the second motor terminal connection portion. The second motor terminal connection portion is the part of the substrate 32 to which the second motor terminals 23B are connected.

[0041] The substrate 32 has an electric circuit for supplying power to two sets of winding groups of the motor 12. The electric circuit includes, for example, two inverter circuits and two microcomputers. The first inverter circuit converts DC power from a DC power source into three-phase AC power and generates the power to be supplied to the first set of winding groups. The second inverter circuit converts DC power from a DC power source into three-phase AC power and generates the power to be supplied to the second set of winding groups. The microcomputer is, for example, a chip-type integrated circuit. The first microcomputer controls the power supply to the first set of winding groups via the first inverter circuit. The second microcomputer controls the power supply to the second set of winding groups via the second inverter circuit.

[0042] The cover 33 is made of synthetic resin. The cover 33 is a box-shaped body having a rectangular cross-sectional shape. The cover 33 is open toward the motor 12. The cover 33 is attached to the substrate housing portion 21 so as to cover the opening 21 of the substrate housing portion 21 in a state where the connector assembly 31 and the substrate 32 are attached.

[0043] <Method of Connecting the Substrate 32 and the Terminals> Next, the method of connecting the substrate 32 and the terminals will be described. As shown in FIG. 3, the substrate 32 has a back surface and a front surface. The back surface is the surface of the substrate 32 that faces the end wall of the substrate housing portion 21 in the axial direction of the motor 12. The front surface is the surface on the opposite side of the back surface of the substrate 32.

[0044] The first power terminal 42 extends in the axial direction of the motor 12. The first end of the first power terminal 42 is disposed inside the first power connector 41B. The second end of the first power terminal 42 penetrates the substrate 32 in the axial direction of the motor 12 and protrudes from the front surface of the substrate 32. The second end of the first power terminal 42 is joined to the substrate 32 by solder 32A. Thereby, the first power terminal 42 and the pattern wiring of the substrate 32 are electrically connected.

[0045] The first ground terminal 43 extends in the axial direction of the motor 12. The first end of the first ground terminal 43 is disposed inside the first power connector 41B. The second end of the first ground terminal 43 penetrates the substrate 32 in the axial direction of the motor 12 and protrudes from the surface of the substrate 32. The second end of the first ground terminal 42 is joined to the substrate 32 by solder 32A. Thereby, the first power terminal 42 and the pattern wiring of the substrate 32 are electrically connected.

[0046] The second power terminal 44 extends in the axial direction of the motor 12. The first end of the second power terminal 44 is disposed inside the second power connector 41C. The second end of the second power terminal 44 penetrates the substrate 32 in the axial direction of the motor 12 and protrudes from the surface of the substrate 32. The second end of the second power terminal 44 is joined to the substrate 32 by solder 32A. Thereby, the second power terminal 44 and the pattern wiring of the substrate 32 are electrically connected.

[0047] The second ground terminal 45 extends in the axial direction of the motor 12. The first end of the second ground terminal 45 is disposed inside the second power connector 41C. The second end of the second ground terminal 45 penetrates the substrate 32 in the axial direction of the motor 12 and protrudes from the surface of the substrate 32. The second end of the second ground terminal 45 is joined to the substrate 32 by solder 32A. Thereby, the second ground terminal 45 and the pattern wiring of the substrate 32 are electrically connected.

[0048] For convenience of explanation, illustration is omitted, but a plurality of first signal terminals 46 and a plurality of second signal terminals 47 are electrically connected to the pattern wiring of the substrate 32 by solder 32A, respectively, in the same manner as the first power terminal 42 and the like. Also, in FIG. 3, the cover 33 is omitted.

[0049] <Reinforcement Structure of Connector Assembly 31> Next, the reinforcement structure of the connector assembly 31 will be described. As shown in Figure 4, the second end face S2 of the base 41A has two long sides facing each other and two short sides extending in a direction intersecting the long sides and facing each other. The long sides and short sides do not have to be perpendicular to each other. The first to fourth fastening parts 48A to 48D are each arranged at the four corners of the second end face S2 where the two long sides and the two short sides intersect. The first fastening part 48A and the second fastening part 48B are adjacent to each other along the first long side of the base 41A. The third fastening part 48C and the fourth fastening part 48D are adjacent to each other along the second long side of the base 41A. The distance between the first fastening part 48A and the second fastening part 48B is shorter than the distance between the third fastening part 48C and the fourth fastening part 48D. The first fastening portion 48A and the third fastening portion 48C are adjacent to each other along the first short side. The second fastening portion 48B and the fourth fastening portion 48D are adjacent to each other along the second short side. The distance between the first fastening portion 48A and the third fastening portion 48C is the same as the distance between the second fastening portion 48B and the fourth fastening portion 48D.

[0050] The body 41 has a first rib 51, a second rib 52, a third rib 53, and a fourth rib 54. The first to fourth ribs 51 to 54 are provided on the second end face S2 of the base 41A. The first rib 51 is a wall that extends continuously along the first long side of the base 41A and connects the first fastening part 48A and the second fastening part 48B. The second rib 52 is a wall that extends continuously along the second long side of the base 41A and connects the third fastening part 48C and the fourth fastening part 48D. The third rib 53 is a wall that extends continuously in a direction intersecting the long side of the base 41A and connects the first fastening part 48A and the third fastening part 48C. The fourth rib 54 is a wall that extends continuously in a direction intersecting the long side of the base 41A, and connects the second fastening portion 48B and the fourth fastening portion 48D.

[0051] The second rib 52 has a truss structure. The truss structure is a framework structure made up of triangles as a single unit. The second rib 52 has an inner wall 52A, an outer wall 52B, and a plurality of inclined walls 52C. The inner wall 52A and the outer wall 52B are walls that extend continuously along the second long side of the base 41A, and connect the third fastening part 48C and the fourth fastening part 48D. The inner wall 52A is positioned inside the outer wall 52B with a gap in between. The inclined walls 52C are walls positioned between the inner wall 52A and the outer wall 52B, and are connected to the inner wall 52A and the outer wall 52B at an inclination relative to each of them.

[0052] However, the inclination directions of two adjacent inclined walls 52C in the direction of the long side of the base 41A are opposite to each other. Two adjacent inclined walls 52C in the direction of the long side of the base 41A are alternately connected to the inner wall 52A and the outer wall 52B at the same connection point. That is, the multiple inclined walls 52C are arranged in line in the direction of the long side of the base 41A such that multiple spatial portions having a triangular cross-sectional shape are formed between the inner wall 52A and the outer wall 52B. When viewed from a direction perpendicular to the base 41A, the vertices of the triangles alternately face the inner wall 52A and the outer wall 52B.

[0053] The body 41 has a first support wall 55 and a second support wall 56. The first support wall 55 connects the first fastening portion 48A and the third fastening portion 48C via a first positioning pin portion 49A. The second support wall 56 connects the second fastening portion 48B and the fourth fastening portion 48D via a second positioning pin portion 49B.

[0054] As shown in Figure 5, the first to fourth ribs 51 to 54 are connected in a frame-like manner via the first to fourth fastening parts 48A to 48D. The first to fourth ribs are arranged to form a trapezoid when viewed from a direction perpendicular to the base 41A. For example, the first rib 51 corresponds to the top base of the trapezoid, and the second rib 52 corresponds to the bottom base of the trapezoid. The third rib 53 and the fourth rib 54 correspond to the legs of the trapezoid, respectively. The first rib 51 may be curved or bent so as to be convex toward the second rib 52 when viewed from a direction perpendicular to the base 41A. By providing the first to fourth ribs 51 to 54 on the body 41, the rigidity of the body 41 is improved.

[0055] The connector assembly 31 is symmetrical with respect to the axis of symmetry L0 when viewed from a direction perpendicular to the base 41A. The axis of symmetry L0 is a straight line that passes through the center of the connector assembly 31 and extends in the direction of the shorter side when viewed from a direction perpendicular to the base 41A. The direction of the shorter side is the direction in which the side length of the base 41A is shorter.

[0056] <Shape of Power Terminals and Ground Terminals> Next, the shapes of the first power terminal 42, the first ground terminal 43, the second power terminal 44, and the second ground terminal 45 will be described. The first power terminal 42, the first ground terminal 43, the second power terminal 44, and the second ground terminal 45 are all the same shape. For this reason, the shape of the first power terminal 42 will be described in detail, while detailed descriptions of the shapes of the first ground terminal 43, the second power terminal 44, and the second ground terminal 45 will be omitted.

[0057] As shown in Figure 6, the first power terminal 42 is a metal plate. The first power terminal 42 is formed, for example, by punching out a predetermined shape from a metal plate material such as copper, which has excellent conductivity, using a press device. The first power terminal 42 is a straight-type terminal that extends in a straight line overall. The first power terminal 42 has a connector connection portion 42A, a substrate connection portion 42B, and a meandering portion 42C. The meandering portion 42C is located between the connector connection portion 42A and the substrate connection portion 42B.

[0058] The connector connection portion 42A includes the first end of the first power terminal 42. The connector connection portion 42A is connected to the first mating connector. The width of the connector connection portion 42A is set to a length that can secure the necessary cross-sectional area according to the capacity of the current flowing through the first power terminal 42. The width is the length of the connector connection portion 42 in a direction perpendicular to the direction in which the first power terminal 42 extends. The connector connection portion 42A does not have to have a constant width along its entire length in the direction in which the first power terminal 42 extends. That is, the connector connection portion 42A may include a narrow portion and a wide portion.

[0059] The board connection portion 42B is the portion that includes the second end of the first power terminal 42. The board connection portion 42B is connected to the board 32. The meandering portion 42C connects the connector connection portion 42A and the board connection portion 42B. The meandering portion 42C is the portion of the first power terminal 42 that alternately bends in a direction perpendicular to the direction in which the first power terminal 42 extends. The meandering portion 42C meanders within the width of the connector connection portion 42A. The meandering portion 42C functions as a rigidity reduction portion to reduce the rigidity of the first power terminal 42. The rigidity of the meandering portion 42C is lower than, for example, the rigidity of the connector connection portion 42A. For this reason, the meandering portion 42C is more elastically deformable in the direction in which the first power terminal 42 extends compared to the connector connection portion 42A.

[0060] As shown in Figure 7, the end of the connector connection portion 42A opposite to the meandering portion 42C penetrates the base 41A and is located inside the first power connector 41B. The substrate connection portion 42B penetrates the substrate 32 in the thickness direction. The substrate connection portion 42B is joined to the substrate 32 by solder 32A from the side of the substrate 32 opposite to the first power connector 41B.

[0061] The first ground terminal 43, like the first power terminal 42, has a connector connection portion 43A, a board connection portion 43B, and a meandering portion 43C. Although not shown in the diagram, the end of the connector connection portion 43A opposite to the meandering portion 43C passes through the base 41A and is located inside the first power connector 41B. The board connection portion 43B penetrates the board 32 in the thickness direction. The board connection portion 43B is joined to the board 32 by solder 32A.

[0062] The second power terminal 44, like the first power terminal 42, has a connector connection portion 44A, a board connection portion 44B, and a meandering portion 44C. Although not shown in the figures, the end of the connector connection portion 44A opposite to the meandering portion 44C passes through the base 41A and is located inside the second power connector 41C. The board connection portion 44B penetrates the board 32 in the thickness direction. The board connection portion 44B is joined to the board 32 by solder 32A.

[0063] The second ground terminal 45, like the first power terminal 42, has a connector connection portion 45A, a board connection portion 45B, and a meandering portion 45C. Although not shown in the illustration, the end of the connector connection portion 45A opposite to the meandering portion 45C passes through the base 41A and is located inside the second power connector 41C. The board connection portion 45B penetrates the board 32 in the thickness direction. The board connection portion 45B is joined to the board 32 by solder 32A.

[0064] <Operation of this Embodiment> Next, the operation of this embodiment will be described. As shown in Figure 8, for example, when the first mating connector is mated with the first power connector 41B, an insertion force F1 acts on the first power terminal 42 and the first ground terminal 43. The insertion force F1 is the force required to mate the first mating connector with the first power connector 41B. Also, when the first mating connector, which is mated with the first power connector 41B, is removed from the first power connector 41B, an extraction force F2 acts on the first power terminal 42 and the first ground terminal 43. The extraction force F2 is a force in the opposite direction to the insertion force F1 and is the force required to remove the first mating connector from the first power connector 41B.

[0065] Similarly, when the second mating connector is mated to the second power connector 41C, an insertion force F1 acts on the second power terminal 44 and the second ground terminal 45. When the second mating connector, which is mated to the second power connector 41C, is removed from the second power connector 41C, an extraction force F2 acts on the second power terminal 44 and the second ground terminal 45.

[0066] Although not shown in the diagram, when the third mating connector is attached to or detached from the first signal connector 41D, an insertion force F1 or an extraction force F2 acts on the first signal terminal 46. Similarly, when the fourth mating connector is attached to or detached from the second signal connector 41E, an insertion force F1 or an extraction force F2 acts on the second signal terminal 47.

[0067] However, the first signal connector 41D and the second signal connector 41E are smaller in size than the first power connector 41B and the second power connector 41C. Therefore, the insertion force F1 and extraction force F2 acting on the first signal terminal 46 and the second signal terminal 47 are smaller than the insertion force F1 and extraction force F2 acting on the first power terminal 42 and the first ground terminal 43, and the second power terminal 44 and the second ground terminal 45. Accordingly, in the following description, we will focus on the insertion force F1 and extraction force F2 acting on the first power terminal 42 and the first ground terminal 43, and the second power terminal 44 and the second ground terminal 45.

[0068] The insertion force F1 and the extraction force F2 are transmitted to the body 41 via the first power terminal 42 and the first ground terminal 43, or the second power terminal 44 and the second ground terminal 45. The insertion force F1 and the extraction force F2 act to cause the body 41 to bend in the axial direction of the motor 12, with the first to fourth fastening portions 48A to 48D as fulcrums. However, the body 41 has first to fourth ribs 51 to 54 as a reinforcing structure. This reinforcing structure improves the rigidity of the body 41 in the axial direction of the motor 12. The axial direction of the motor 12 is the direction in which the insertion force F1 and the extraction force F2 act. Therefore, the bending of the body 41 in the axial direction of the motor 12, with the first to fourth fastening portions 48A to 48D as fulcrums, is suppressed.

[0069] If the body 41 does not have a reinforcing structure, the body 41 may elastically bend in the axial direction of the motor 12, with the first to fourth fastening portions 48A to 48D as fulcrums. The direction in which the body 41 bends includes a first direction D1 and a second direction D2. The first direction D1 is the direction in which the body 41 moves toward the substrate 32. The second direction D2 is the opposite direction to the first direction and is the direction in which the body 41 moves toward the substrate 32.

[0070] When the body 41 bends in the axial direction of the motor 12 with the first to fourth fastening portions 48A to 48D as fulcrums, the elastic deformation of the body 41 is transmitted to the solder 32A via the first power terminal 42 and the first ground terminal 43, or the second power terminal 44 and the second ground terminal 45. The elastic deformation of the body 41 includes, for example, elastic deformation that is convex in the first direction D1 and elastic deformation that is convex in the second direction.

[0071] The second ends of each terminal (42, 43, 44, 45) are connected to the substrate 32 by solder 32A. Therefore, when the body 41 bends, each terminal receives a moment corresponding to the bending of the body 41. The moment is a force that rotates each terminal. For example, the part of the terminal supported by the body 41 becomes the point of force application P1, and the part of the terminal joined to the substrate 32 by solder 32A becomes the point of application P2. The point of force application P1 is the part of the terminal to which the force is applied. The point of application P2 is the part of the terminal that becomes the center of rotation. As each terminal receives a moment, there is a risk of stress concentration in the solder 32A. Stress concentration is one of the causes of solder 32A failure.

[0072] Therefore, in order to maintain a good connection between each terminal and the substrate 32, it is effective to provide a reinforcing structure to the body 41, as in this embodiment. As the rigidity of the body 41 is improved, the elastic deformation of the body 41 when the insertion force F1 and the extraction force F2 are applied to the body 41 is suppressed. This suppresses the moment that each terminal receives. Consequently, the concentration of stress on the solder 32A is suppressed.

[0073] Furthermore, as shown in Figure 9, in order to further suppress the concentration of stress on the solder 32A, it is conceivable to use a bent terminal 61 instead of the straight terminals (42, 43, 44, 45). The bent terminal 61 has a crank shape when viewed from the radial direction of the motor 12. The crank shape is a shape in which two right-angle curves are alternately connected. The bent terminal 61 has a portion that extends in the direction in which the insertion force F1 and the extraction force F2 act, and a portion that extends in a direction perpendicular to the direction in which the insertion force F1 and the extraction force F2 act.

[0074] Therefore, when an insertion force F1 or extraction force F2 acts on the bendable terminal 61, the bendable terminal 61 is easily elastically deformed in the direction in which the insertion force F1 or extraction force F2 acts. Also, because the bendable terminal 61 has a bendable portion, it is easy to ensure a length that follows the shape of the terminal. In particular, the longer the length of the portion of the bendable terminal 61 that extends in a direction perpendicular to the direction in which the insertion force F1 and extraction force F2 act, the easier the bendable terminal 61 is to deform. Since the deformation of the body 41 due to the insertion force F1 and extraction force F2 is absorbed by the deformation of the bendable terminal 61, the concentration of stress on the solder 32A is suppressed.

[0075] However, the body 41 needs to have space to accommodate the bendable terminal 61, particularly the portion of the bendable terminal 61 that extends in a direction perpendicular to the direction in which the insertion force F1 and the extraction force F2 act. This may cause the body 41, and consequently the motor device 11, to become larger. For example, if the portion of the bendable terminal 61 that extends in a direction perpendicular to the direction in which the insertion force F1 and the extraction force F2 act is aligned with the protrusion direction D3 of the protruding portion 21B, the size of the body 41, and consequently the motor device 11, may increase in the protrusion direction D3.

[0076] In contrast, each terminal (42, 43, 44, 45) in this embodiment extends linearly in the direction in which the insertion force F1 and the extraction force F2 act. Therefore, unlike when a bent terminal 61 is used, there is no need to provide space to accommodate the portion of the terminal that extends in a direction perpendicular to the direction in which the insertion force F1 and the extraction force F2 act. As a result, it is possible to miniaturize the body 41 and, consequently, the motor device 11.

[0077] Furthermore, as shown in Figure 10A, for example, the first power terminal 42 has a meandering portion 42C. The meandering portion 42C has lower rigidity than the other parts of the first power terminal 42. Therefore, as shown in Figure 10B, when the body 41 is elastically deformed so that it becomes convex in the first direction D1, the meandering portion 42C is elastically compressed in proportion to the amount of deformation of the body 41. After the meandering portion 42C is compressed, the length L2 of the first power terminal 42 becomes shorter than the original length L1 by the amount of compression δ. Although not shown in the figure, when the body 41 is elastically deformed so that it becomes convex in the second direction D2, the meandering portion 42C elastically elongates in proportion to the amount of deformation of the body 41. After the meandering portion 42C is elongated, the length of the first power terminal 42 becomes longer than the original length by the amount of elongation.

[0078] Therefore, if an insertion force F1 or withdrawal force F2 is applied to the first power terminal 42, even if the body 41 is slightly curved in the axial direction of the motor 12 with the first to fourth fastening portions 48A to 48D as fulcrums, the elastic deformation of the body 41 is absorbed by the elastic deformation of the meandering portion 42C. This relieves the stress generated at the joint between the first power terminal 42 and the substrate 32.

[0079] As shown in Figure 10A, the first ground terminal 43, the second power terminal 44, and the second ground terminal 45, like the first power terminal 42, have meandering portions 43C, 44C, and 45C. Therefore, when an insertion force F1 or withdrawal force F2 is applied to the first ground terminal 43, the second power terminal 44, and the second ground terminal 45, the elastic deformation of the body 41 is absorbed by the elastic deformation of the meandering portions 43C, 44C, and 45C. Consequently, the stress generated at the joint between the first ground terminal 43 and the substrate 32, the joint between the second power terminal 44 and the substrate 32, and the joint between the second ground terminal 45 and the substrate 32 is relieved.

[0080] <Effects of the Embodiment> This embodiment provides the following effects: (1) The electronic control device 13 comprises a substrate 32 and a connector assembly 31 facing the substrate 32. The connector assembly 31 has a synthetic resin body 41 that is attached to an object to be mounted, and terminals held by the body 41. The object to be mounted is, for example, a motor 12. The terminals include a first power terminal 42, a first ground terminal 43, a second power terminal 44, and a second ground terminal 45. The body 41 has a first end face S1 on which a connector configured to mate with a mating connector is provided, and a second end face S2 facing the substrate 32 on the opposite side of the first end face S1. The connector includes a first power connector 41B and a second power connector 41C. The terminals have a first end located inside the connector and a second end connected to the substrate 32 while penetrating the substrate 32 in the thickness direction.

[0081] The second end face S2 of the body 41 is provided with a plurality of fastening portions to which the substrate 32 is fixed, and ribs that connect the plurality of fastening portions to each other. The plurality of fastening portions include first to fourth fastening portions 48A to 48D. The ribs include first to fourth ribs 51 to 54. With this configuration, the rigidity of the body 41 is improved because the plurality of fastening portions are connected to each other by the ribs. That is, for example, when attaching or detaching a mating connector to a connector, the body 41 becomes less prone to elastic deformation. As a result, stress concentration at the connection portion between the terminal and the substrate 42 caused by the elastic deformation of the body 41 is suppressed. Therefore, a good connection state between the terminal and the substrate 32 can be maintained.

[0082] (2) The connectors (41B, 41C) are arranged so as to overlap with the substrate 32 when viewed from a direction perpendicular to the substrate 32. With this configuration, for example, when attaching or detaching a mating connector to the other connector, stress tends to concentrate at the connection point between the terminals and the substrate 32 due to the elastic deformation of the body 41. For this reason, it is preferable to improve the rigidity of the body 41 by connecting multiple fastening parts with ribs.

[0083] (3) The second end face S2 of the body 41 has two long sides facing each other and two short sides extending in a direction intersecting the long sides and facing each other. The first to fourth fastening parts 48A to 48D are respectively located at the four corners of the second end face S2 where the two long sides and the two short sides intersect. The ribs include the first to fourth ribs 51 to 54. The first rib 51 connects the first fastening part 48A and the second fastening part 48B, which are adjacent to each other along the first long side of the two long sides. The second rib 52 connects the third fastening part 48C and the fourth fastening part 48D, which are adjacent to each other along the second long side of the two long sides. The third rib 53 connects the first fastening part 48A and the third fastening part 48C, which are adjacent to each other along the first short side of the two short sides. The fourth rib 54 connects the second fastening portion 48B and the fourth fastening portion 48D, which are adjacent to each other along the second short side of the two short sides.

[0084] In this configuration, the first to fourth ribs 51 to 54 are connected in a frame-like manner via the first to fourth fastening portions 48A to 48D. As a result, the rigidity of the body 41 can be appropriately improved.

[0085] (4) At least one of the first rib 51 and the second rib 52 has a truss structure. The distance between two fastenings adjacent to each other in the long-side direction is longer than the distance between two fastenings adjacent to each other in the short-side direction. For this reason, the first rib 51 and the second rib 52 extending in the long-side direction are more elastically deformable than the third rib 53 and the fourth rib 54 extending in the short-side direction. For this reason, having at least one of the first rib 51 and the second rib 52 have a truss structure allows for adequate rigidity of the body 41.

[0086] (5) The first to fourth ribs 51 to 54 are arranged to form a trapezoid when viewed from a direction perpendicular to the substrate 32. Of the first to fourth ribs 51 to 54, the longest rib has a truss structure. The longest rib is, for example, the second rib 52. The longest rib is more elastically deformable than the other three ribs. Therefore, by having the longest rib have a truss structure, the rigidity of the body 41 can be appropriately ensured.

[0087] (6) The terminals (42-45) have meandering portions (42C, 43C, 44C, 45C). The meandering portions are the parts of the terminal that are bent alternately in a direction perpendicular to the direction in which the terminal extends. With this configuration, the meandering portions have lower rigidity than the other parts of the terminal. Therefore, when the body 41 is elastically deformed in a direction perpendicular to the substrate 32, for example, the meandering portions expand and contract elastically in accordance with the amount of deformation of the body 41. Since the elastic deformation of the body 41 is absorbed by the elastic deformation of the meandering portions, the stress generated at the joint between the terminal and the substrate 32 is relieved.

[0088] (7) The terminals (42-45) are straight terminals that extend in a straight line. For this reason, the material cost of the terminals can be reduced compared to, for example, the bent terminal 61 which has a large bent portion. Also, bending is not required to bend the terminals. For this reason, the product cost of the terminals can be reduced. Furthermore, the body 41 and, consequently the motor device 11 can be made smaller compared to when using the bent terminal 61.

[0089] (8) The motor device 11 includes an electronic control unit 13. The electronic control unit 13 can maintain a good connection between the terminals (42-45) and the circuit board 32. For this reason, the electronic control unit 13 is suitable for the motor device 11.

[0090] <Other Embodiments> This embodiment may be implemented with the following modifications: The method of connecting each terminal (42, 43, 44, 45) to the substrate 32 is not limited to soldering. For example, each terminal may be connected to the substrate 32 by a press-fit method. The press-fit method is a method of connecting to the substrate 32 by simply pressing an elastic terminal into a through-hole in the substrate 32. A through-hole is a through-hole that penetrates the substrate 32 in the thickness direction. The press-fit method eliminates the need for soldering by simultaneously achieving the functions of electrical connection and mechanical retention between the terminal and the substrate 32.

[0091] As shown in Figure 11A, the substrate 32 has a plurality of through-holes 32B. However, for the sake of explanation, only one through-hole 32B is shown in Figure 11A. For example, the second end of the first power terminal 42 has a widened portion 71. The second end is the end of the first power terminal 42 connected to the substrate 32. The width of the widened portion 71 is wider than the width of the remaining part of the second end excluding the widened portion 71. Also, the width of the widened portion 71 is wider than the width of the through-hole 32B corresponding to the first power terminal 42. The widened portion 71 has a hole 71A. The hole 71A penetrates the widened portion 71 in the thickness direction. By providing a hole 71A in the widened portion 71, the widened portion 71 becomes more elastically deformable in the direction that reduces the diameter of the hole 71A.

[0092] As shown in Figure 11B, the widened portion 71 is press-fitted into the through-hole 32B corresponding to the first power terminal 42 in the thickness direction of the substrate 32. When the widened portion 71 is press-fitted into the through-hole 32B, the widened portion 71 elastically deforms in a direction that reduces the diameter of the hole 71A. The elastic force of the widened portion 71 maintains contact between the widened portion 71 and the through-hole 32. The first ground terminal 43, the second power terminal 44, and the second ground terminal 45 each have the same configuration as the first power terminal 42.

[0093] Thus, even when each terminal (42, 43, 44, 45) is connected to the substrate 32 by a press-fit method, the body 41 curves in the axial direction of the motor 12 with the first to fourth fastening portions 48A to 48D as fulcrums, which may cause stress to concentrate at the connection points between each terminal and the substrate 32. For this reason, it is effective to provide the body 41 with first to fourth ribs 51 to 54 as a reinforcing structure, and to provide meandering portions (42C, 43C, 44C, 45C) at each terminal.

[0094] The orientation of the connector assembly 31 can be changed as appropriate. For example, the connector assembly 31 may be positioned on the opposite side of the circuit board 32 from the motor 12. In this case, the orientation of the connector assembly 31 is the opposite of the orientation shown in Figure 2 in the axial direction of the motor 12. The first power connector 41B, the second power connector 41C, the first signal connector 41D, and the second signal connector 41E penetrate the end wall of the cover 33 and protrude to the outside of the cover 33.

[0095] - If the strength of the connector assembly 31 can be ensured, the first rib 51 may have a truss structure instead of the second rib 52. Also, neither the first rib 52 nor the second rib 52 has to have a truss structure. Conversely, if it is necessary to further increase the strength of the connector assembly 31, at least one of the first rib 51, the third rib 53, and the fourth rib 54 may have a truss structure in addition to the second rib 52.

[0096] As used herein, the expression "at least one" means "one or more" of the desired options. For example, as used herein, if there are two options, the expression "at least one" means "only one option" or "both of the two options." As another example, as used herein, the expression "at least one" means "only one option" or "any combination of two or more options" if there are three or more options.

[0097] The first to fourth ribs 51 to 54 do not necessarily have to be assembled to form a trapezoid when viewed from a direction perpendicular to the substrate 32. The first to fourth ribs 51 to 54 may be assembled to form, for example, a rectangle when viewed from a direction perpendicular to the substrate 32.

[0098] The number of fastening points supporting the substrate 32 is not limited to four. The number of fastening points can be any number as long as the substrate 32 can be stably supported. The number of fastening points can be appropriately changed, for example, depending on the size of the substrate 32 or the connector assembly 31. However, the number of fastening points should be two or more.

[0099] The number of ribs constituting the reinforcing structure of body 41 is not limited to four. The number of ribs can be any number as long as the required strength of body 41 is ensured. Whether or not the ribs are made into a truss structure can be determined by whether the required strength of body 41 is ensured. However, the number of ribs must be one or more.

[0100] - The motor 12 may have one set of windings, and the control system and power supply system of the motor 12 may each be one set. In this case, the connector assembly 31 may omit the first power connector 41B and the first signal connector 41D, or the second power connector 41C and the second signal connector 41E.

[0101] The electronic control device 13 may be applied to electrical equipment other than the motor 12.

Claims

1. An electronic control device comprising a substrate and a connector assembly facing the substrate, wherein the connector assembly has a body made of synthetic resin configured to be attached to an object and a terminal held by the body, the body has a connector configured to mate with a mating connector, a first end face on which the connector is provided and a second end face on the opposite side of the first end face that faces the substrate, the terminal has a first end positioned inside the connector and a second end that is connected to the substrate while penetrating the substrate in the thickness direction, and the second end face is provided with a plurality of fastening portions to which the substrate is fixed and ribs connecting the plurality of fastening portions to each other.

2. The electronic control device according to claim 1, wherein the connector is arranged to overlap with the substrate when viewed from a direction perpendicular to the substrate.

3. The electronic control device according to claim 1, wherein the second end face has two opposing long sides and two opposing short sides extending in a direction intersecting the long sides, the fastening portions are arranged at the four corners of the second end face where the two long sides and the two short sides intersect, and the ribs include a first rib connecting two adjacent fastening portions along the first long side of the two long sides, a second rib connecting two adjacent fastening portions along the second long side of the two long sides, a third rib connecting two adjacent fastening portions along the first short side of the two short sides, and a fourth rib connecting two adjacent fastening portions along the second short side of the two short sides.

4. The electronic control device according to claim 3, wherein at least one of the first rib and the second rib has a truss structure.

5. The electronic control device according to claim 3, wherein the first to fourth ribs are arranged to form a trapezoid when viewed from a direction perpendicular to the substrate, and the longest of the first to fourth ribs has a truss structure.

6. The electronic control device according to claim 1, wherein the terminal has a meandering portion which is a part that is bent alternately in a direction perpendicular to the direction in which the terminal extends.

7. A motor device comprising an electronic control device as described in any one of claims 1 to 6.

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