JP7735907B2 - Drive unit - Google Patents

Description

The present invention relates to a drive device.

Conventionally, drive devices with two or more boards are known that integrate a motor and a control unit.

For example, the drive device disclosed in Patent Document 1 includes a logic board (20), a first power board (30), and a second power board (30). A plurality of connector pins connected between the logic board and the first power board are bundled in a logic connector housing (71, 61), forming a logic connector (70, 60).

International Publication No. 2021/223876

Patent Document 1 does not provide detailed information about the technical significance of bundling multiple connector pins in a connector housing. The first logic connector (70), which has shorter connector pins, uses one logic connector housing (71), while the second logic connector (60), which has longer connector pins, uses two logic connector housings (61.1, 61.2). This simply means that the number of logic connector housings is adjusted according to the length of the connector pins.

Furthermore, in the drive device of Patent Document 1, the connector plate (10) on which the plug connector (11) is mounted has a body formed in a roughly circular plate shape, which is resistant to deformation or bending due to thermal expansion or contraction. Therefore, it is presumed that no consideration was given to the possibility that stress could be transmitted to the connector pins via the logic board due to deformation of the plug connector.

In contrast, in a drive device equipped with two or more circuit boards, a configuration is envisioned in which connectors for connecting external power cables and signal cables are provided in a bottomed, tubular resin part. In this specification, this bottomed, tubular resin part is referred to as a "connector housing," meaning a "casing equipped with an external connector." Confusingly, Patent Document 1 uses the term "connector housing" to refer to a part that bundles pins for electrical connection between circuit boards, so care must be taken to avoid misunderstandings.

The connector housing, a cylindrical part with a bottom made of resin, bends due to thermal expansion and contraction, and this stress is applied to the terminals connected between the boards via the connector's board. This can cause stress that exceeds the terminal's allowable load.

The present invention was made in consideration of the above-mentioned problems, and its purpose is to provide a drive device with two or more boards that alleviates stress generated in inter-board terminals due to expansion and contraction of a resin connector housing.

The drive device according to the present invention is an integral structure of a motor (80) including a stator (860) and a rotor (865), and a control unit (10) that is provided on one axial side of the motor and drives and controls the motor. The drive device includes a metal motor frame (840), two or more circular circuit boards (31, 32), a resin connector housing (50), a plurality of connector terminals (45), a plurality of inter-board terminals (43), and a plurality of resin inter-board terminal binders (61-64).

The motor frame is located at the end of the motor on the control unit side in the axial direction. Two or more boards are arranged in layers on the opposite side of the motor frame from the motor, and the electronic components that make up the control unit are mounted on them.

The connector housing is cylindrical and has a top plate portion (561) that faces the motor frame and an outer tube portion (562) that extends from the outer edge of the top plate portion toward the motor and has one end fixed to the motor or motor frame. The connector housing has one or more connectors (57, 58) attached to the top plate portion. Multiple connector terminals are fixed to the connector housing, with one end electrically connected to one of the boards and the other end exposed at the connector opening.

The plurality of inter-board terminals are arranged in an arc shape along the outer periphery of the substrates and are electrically connected between the substrates by a press-fit method. The inter-board terminal binder is divided into multiple stages in the stacking direction of the substrates and includes arc-shaped portions corresponding to the arrangement of the plurality of inter-board terminals, and holds the plurality of adjacent inter-board terminals in a bundle.

In this invention, the board-to-board terminal binder is divided into multiple stages, which blocks stress transmission at the exposed terminal portions between each stage. This reduces stress generated in the board-to-board terminals due to the expansion and contraction of the connector housing.

For example, the inter-board terminal binder is composed of two layers: a lower binder (61) on the motor frame side and an upper binder (62-64) on the top plate side. Preferably, the sum of the thicknesses of the lower and upper binders in the stacking direction of the boards (Tsum) is greater than the exposed terminal length (Lex), which is the distance between the lower and upper binders.

1 is a schematic configuration diagram of an electric power steering device to which a drive device is applied; FIG. 3 is a partial cross-sectional view showing a motor unit of the drive device. FIG. 3 is a view taken in the direction of an arrow III in FIG. 2 . FIG. 2 is a schematic cross-sectional view of a control unit according to the first embodiment. FIG. 5 is an enlarged schematic cross-sectional view taken along the arrow V in FIG. 4 . FIG. 2 is a schematic side view of the board-to-board terminal module according to the first embodiment. FIG. FIG. FIG. 2 is a plan view of an inter-board terminal binder according to an embodiment. FIG. 10 is a plan view of an inter-board terminal binder according to another embodiment. FIG. 10 is a schematic side view of the board-to-board terminal module according to the second embodiment. FIG. 11 is a schematic side view of the board-to-board terminal module according to the third embodiment. FIG. 10 is a schematic side view of the board-to-board terminal module according to the fourth embodiment. FIG. 13 is a schematic side view of the board-to-board terminal module according to the fifth embodiment.

Several embodiments of the drive device according to the present invention will be described below with reference to the drawings. Substantially identical components in the various embodiments will be assigned the same reference numerals and will not be described again. The first to fifth embodiments will be collectively referred to as "the present embodiment." The drive device of this embodiment is used, for example, as a steering assist motor for an electric power steering device, and the motor and a control unit that controls the drive of the motor are integrally configured.

[Configuration of electric power steering device]
The schematic configuration of an electric power steering device 99 will be described with reference to Figure 1. Although a rack-assist type electric power steering device is shown in Figure 1, the drive unit 800 of this embodiment is also applicable to a column-assist type electric power steering device. A steering system 90 including the electric power steering device 99 includes a steering wheel 91, a steering shaft 92, a pinion gear 96, a rack shaft 97, wheels 98, and the electric power steering device 99.

A torque sensor 93 that detects steering torque is attached to a steering shaft 92 connected to a steering wheel 91. A pinion gear 96 that meshes with a rack shaft 97 is attached to the tip of the steering shaft 92. When the driver turns the steering wheel 91, the rotational motion of the steering shaft 92 is converted into linear motion of the rack shaft 97 by the pinion gear 96. A pair of wheels 98 connected to both ends of the rack shaft 97 are steered to an angle that corresponds to the amount of displacement of the rack shaft 97.

The electric power steering device 99 includes a drive unit 800 in which the motor 80 and control unit 10 are integrated, and a reduction gear 89 that reduces the rotation of the motor 80 and transmits it to the rack shaft 97. The motor 80 is a two-system three-phase brushless motor with two sets of three-phase windings. The control unit 10 has at least a "two-system drive" configuration in which two inverter circuits can supply power to the two sets of three-phase windings. The motor 80 outputs steering assist torque when supplied with three-phase AC power converted from DC power by the inverter circuit of the control unit 10.

The power supply system connector 57 of the control unit 10 receives DC power from the vehicle power supply 905 and also inputs and outputs communication signals to and from the vehicle communication network ("CAN" in the figure) 906. The signal system connector 58 receives a sensor signal detected by the torque sensor 93 via a harness 94. In this way, the power supply system connector 57 and the signal system connector 58 are configured as connectors with different opening widths.

[Configuration of driving device]
The overall configuration of the drive device 800 will be described with reference to Figures 2 and 3. The direction parallel to the rotation axis O of the motor 80 shown in Figure 2 is referred to as the "axial direction," and the view from above in Figure 2 in the axial direction is referred to as the plan view. The control unit 10 is provided on one side of the motor 80 in the axial direction. In other words, the drive device 800 has a so-called "mechanically and electrically integrated" configuration.

The motor 80 includes a motor case 830, a motor frame 840, a stator 860, and a rotor 865. The motor case 830 is formed in a generally cylindrical shape with a bottom, consisting of a bottom portion 831 and a cylindrical portion 832, with the control unit 10 provided on the open side. A thin groove-forming wall 834 is formed at the open end of the cylindrical portion 832 via a stepped portion 833.

The stator 860 is fixed to the inside of the cylindrical portion 832 of the motor case 830, and has three-phase motor windings 880 wound therearound. A rotating magnetic field is formed in the stator 860 by the control unit 10 controlling the supply of current to the motor windings 880. The rotor 865 is provided inside the stator 860 , and has a shaft 870 fixed to its center. The shaft 870 is rotatably supported by a front bearing 871 held by the bottom 831 of the motor case 830, and a rear bearing 872 held by the motor frame 840.

The rotor 865 has multiple permanent magnets 867 attached to the outer periphery of the rotor core 866. The rotor 865 rotates around the shaft 870 due to the rotating magnetic field formed in the stator 860. A sensor magnet 875 for detecting the rotation angle is attached to the end of the shaft 870 facing the control unit 10.

The motor frame 840 is provided at the axial end of the motor 80 on the control unit 10 side. The motor frame 840 is formed from an aluminum alloy or the like, and has a frame portion 841 and a flange portion 842. The frame portion 841 is press-fit into the inside of the motor case 830. The flange portion 842 formed on the outer periphery of the frame portion 841 abuts against a stepped portion 833 of the motor case 830. A sealing groove 843 filled with adhesive is formed in the annular space defined by the outer wall of the frame portion 841, the surface of the flange portion 842 facing the control unit 10, and the inner wall of the groove-forming wall 834 of the motor case 830. The motor frame 840 also functions as a heat sink that dissipates heat generated when power is applied to the control unit 10.

The connector housing 50 is made of a resin material such as PBT and has a bottomed cylindrical shape with a top plate portion 561 and an outer cylinder portion 562. A ring-shaped protrusion 563 that protrudes axially is formed at the tip of the outer cylinder portion 562. The protrusion 563 is inserted into the seal groove 843, thereby fixing the outer cylinder portion 562 to the motor 80 or motor frame 840. One or more connectors 57, 58 are provided on the top plate portion 561. In this embodiment, the openings of the connectors 57, 58 face away from the motor 80.

Figure 3 shows an example of the arrangement of connectors 57, 58. Note that Figure 3 is a view seen from the direction of arrow III in Figure 2, but is not drawn to the same scale as Figure 2, but is drawn to the same scale as Figures 7 and 8, which are plan views of the components inside the control unit 10. The x-axis is defined horizontally in Figure 3, and the y-axis is defined vertically. The x-axis and y-axis are referenced in Figures 9 and 10.

Two sets of power supply connectors 57 and signal connectors 58 may be provided for redundancy, as shown in Figure 3, or one set may be provided in other arrangements. A configuration with two sets of connectors 57, 58 is primarily used in "fully dual-system" drive devices, in which two inverter circuits are connected to separate power supplies and various signals are input and output redundantly. On the other hand, a "dual-drive system" drive device, in which two inverter circuits are connected in parallel to a common power supply and various signals are shared between the systems, primarily uses one set of connectors. In Figure 3, the connectors for the two systems are not distinguished by their reference numerals, and are given the same numbers "57" and "58."

The power supply connector 57 is provided with two power supply terminals 45p, including a positive power supply terminal connected to the positive pole of the vehicle power supply 905 and a ground terminal connected to ground, as well as five communication terminals 45c, for example, that connect to a vehicle communication network 906 such as a CAN. The power supply terminal 45p, through which a large current flows, has a connection portion with the harness formed in a rectangular pillar shape. The signal connector 58 is provided with six sensor terminals 45s, for example, that connect to the harness 94 from the torque sensor 93. Note that the symbols "45p," "45c," and "45c" that indicate the type of connector terminal 45 are only used in Figure 3. In Figure 4, they are all referred to as "connector terminals 45."

The connector housing 50 contains two or more circuit boards mounted with the electronic components that make up the control unit 10. The two or more circuit boards are arranged in layers on the opposite side of the motor frame 840 from the motor 80 (upper side in Figure 2). The circuit boards are electrically connected to each other by inter-board terminals.

Next, the first to fifth embodiments will be described in order. The first to fifth embodiments differ in the configuration of the "board-to-board terminal module" (described below) in a drive device equipped with two boards. The reference numeral for the board-to-board terminal module in each embodiment has the embodiment number added as the third digit following "60." Note that configurations equipped with three or more boards will be referred to as "other embodiments."

(First embodiment)
The configuration of the board-to-board terminal module 601 of the first embodiment will be described with reference to Figures 4 to 10. Figure 4 shows a schematic cross-sectional view of the entire control unit 10, and Figure 5 shows an enlarged schematic cross-section of the area surrounded by the two-dot chain line in Figure 4, as viewed in the direction of the arrow V. Figure 6 shows a schematic side view of the board-to-board terminal module 601. Figures 7 and 8 show plan views of the motor-side board 31 and the connector-side board 32. Figures 9 and 10 show plan views of the board-to-board terminal (lower) binder 61 of one embodiment and another embodiment.

As shown in Figure 4, the resin connector housing 50 has a bottomed, cylindrical shape with an outer tube portion 562 extending from the outer edge of a top plate portion 561 facing the motor frame 840 toward the motor 80. A convex portion 563 formed at the tip of the outer tube portion 562 is inserted into an annular seal groove 843 filled with adhesive. When the connector housing 50 is assembled, a load-receiving portion 564 provided at the end of the outer tube portion 562 abuts against the frame outer edge portion 844 of the motor frame 840. As described above, connectors 57 and 58 are provided on the top plate portion 561.

Two boards, a motor-side board 31 and a connector-side board 32, are provided in layers between the motor frame 840 and the top plate 561 of the connector housing 50. An inverter circuit that energizes the motor windings 880 is mounted on the motor-side board 31. Components such as a filter circuit and a communication driver are mounted on the connector-side board 32.

As shown in Figure 7, the motor-side board 31 has screw holes 341 and motor terminal holes 342. The motor-side board 31 is fixed to the motor frame 840 with screws 41, and motor terminals 42 that are connected to the motor windings 880 are connected to it.

As shown in Figures 7 and 8, the motor-side board 31 and the connector-side board 32 have inter-board terminal holes 343 formed along their outer peripheries. A plurality of inter-board terminals 43 are electrically connected between the motor-side board 31 and the connector-side board 32 using a press-fit method. Of the many inter-board terminals 43, Figure 4 shows only three inter-board terminals 43 on each side of the figure. Furthermore, as shown in Figure 8, the connector-side board 32 has connector terminal holes 345 formed near the center that correspond to the four connectors 57 and 58.

In other words, when projected in the axial direction of the motor 80, the multiple board-to-board terminals 43 are arranged in a region radially outward from the multiple connector terminals 45. Because the connectors 57 and 58 are provided near the center of the top plate portion 561 of the connector housing 50, the multiple connector terminals 45 are necessarily arranged in the central region. Therefore, by arranging the multiple board-to-board terminals 43 in a region radially outward, the mounting space for the boards 31 and 32 can be used effectively.

The connector terminals 45 are fixed to the connector housing 50, for example, by insert or outsert molding. One end of the connector terminals 45 is electrically connected to the connector side board 32, which is the board on the top panel portion 561 side. Therefore, when the connector housing 50 expands or contracts, stress is transmitted to the connector side board 32 via the connector terminals 45.

The other ends of the connector terminals 45 are exposed at the openings of connectors 57 and 58. Figure 4 shows five connector terminals 45 in power connector 57 and two in signal connector 58, following the cross-sectional lines in Figure 3.

Figure 5 shows an example of the configuration of a press-fit electrical connection between the board-to-board terminal 43 and the motor-side board 31 and connector-side board 32. In the following specification, when it is clear that "connection between the terminal and board" means electrical connection, the word "electrical" will be omitted as appropriate. The terminal holes 343 of the motor-side board 31 and connector-side board 32 are provided with connection portions 38 such as via holes. The connection portions 38 are electrically connected to electronic components or the connection portions of other terminals via conductive patterns, bus bars, etc. (not shown).

A press-fit connection is achieved by press-fitting a press-fit portion 48, which is elastically formed at the end of the inter-board terminal 43, into the terminal hole 345. The shape of the press-fit portion 48, which has a through-hole formed at the end of the terminal, is disclosed, for example, in Figures 6 and 7 of Japanese Patent No. 6,443,055 (corresponding US publication: US10,424,991B2).

The resin inter-board terminal binders 61, 62 are divided into multiple tiers and provided between the boards 31, 32 in the stacking direction of the boards 31, 32. In the first embodiment, the inter-board terminal binder is composed of two tiers: a lower tier binder 61 on the motor frame 840 side and an upper tier binder 62 on the top plate portion 561 side. The inter-board terminal binders 61, 62 bundle and hold multiple adjacent inter-board terminals 43. By bundling the multiple inter-board terminals 43 with the inter-board terminal binders 61, 62, the relative positional accuracy of the multiple inter-board terminals 43 is ensured.

Here, multiple inter-board terminals 43 that are adjacent to each other within a specific range are defined as a "group of inter-board terminals." For example, in Figures 7 and 8, multiple inter-board terminals 43 connected to terminal holes 343 formed along the left periphery of the motor-side board 31 and connector-side board 32 constitute a "certain group of inter-board terminals." Also, in Figures 7 and 8, multiple inter-board terminals 43 connected to terminal holes 343 formed along the right periphery of the motor-side board 31 and connector-side board 32 constitute a "different group of inter-board terminals."

In one embodiment shown in Figure 9, the lower binder 61R is formed as a single ring and bundles two groups of inter-board terminals 43. In another embodiment shown in Figure 10, the lower binders 61A and 61B are formed by dividing them into two parts in the circumferential direction, each bundling one group of inter-board terminals 43. The direction in which the inter-board terminal binders 61 and 62 bundle the multiple inter-board terminals 43 is referred to as the "binding direction." In the example shown in Figures 9 and 10, the circumferential direction of the boards 31 and 32 is the binding direction.

A structure in which multiple inter-board terminals 43 are bundled together using inter-board terminal binders 61, 62 is called an "inter-board terminal module." Figure 6 shows a schematic side view of the inter-board terminal module 601 of the first embodiment. For simplicity, the detailed shape and number of inter-board terminals 43 are omitted from the schematic side view. Furthermore, as shown in Figures 9 and 10, when viewed from above, Figure 6 has an arc shape, and in detail, Figure 6 corresponds to a schematic exploded side view. The same is true for Figures 11 to 14 of the second to fifth embodiments.

As shown in Figures 5 and 6, the thickness of the lower binder 61 in the stacking direction of the substrates 31, 32 is T1, and the thickness of the upper binder 62 is T2. The distance between the lower binder 61 and the upper binder 62 is the exposed terminal length Lex. The sum of the thicknesses of the lower binder 61 and the upper binder 62, Tsum (= T1 + T2), is greater than the exposed terminal length Lex. In other words, the inter-board terminals 43 are bound by the inter-board terminal binders 61, 62 over a range of more than half the distance between the substrates 31, 32.

As shown in Figures 4 and 6, insertion guides 67 are provided on both ends of the lower binder 61 in the binding direction, protruding outward in the stacking direction, i.e., opposite the upper binder 62. The insertion guides 67 pass through insertion holes 317 formed in the motor-side board 31 and fit into guide holes 847 formed in the motor frame 840. This allows the board-to-board terminal module 601 to be positioned properly during the process of assembling the board-to-board terminal module 601 to the motor frame 840 after the motor-side board 31 is attached to the motor frame 840, improving assembly workability.

(effect)
In this embodiment, the resin connector housing 50 is a large component that covers the entire inter-board terminal module 601, and therefore undergoes relatively large deformation and deflection due to thermal expansion and contraction when the ambient temperature changes. Stress caused by the deformation and deflection of the connector housing 50 is applied to the inter-board terminals 43 via the connector terminals 45 and the connector-side board 32. At this time, stress exceeding the allowable load of the inter-board terminals 43 may be generated.

In this embodiment, the inter-board terminal binders 61, 62 are divided into two upper and lower stages, which blocks stress transmission at the exposed terminal portions between the stages. This reduces stress generated in the inter-board terminals 43 due to expansion and contraction of the connector housing 50.

Incidentally, Figs. 1 and 2 of Patent Document 1 (WO 2021/223876) show a diagram in which components (61.1, 61.2) equivalent to terminal binders that bundle inter-board terminals are divided into two stages. However, in the drive device of Patent Document 1, the connector plate (10) is not a cylindrical resin component with a bottom, so there is no premise for the issue of stress generation due to thermal expansion or thermal contraction. The fact that the components equivalent to terminal binders (61.1, 61.2) are divided into two stages is simply to adjust the number of binders according to the length of the terminals.

In contrast, in this embodiment, there is no aim to change the number of stages of the inter-board terminal binder depending on the length of the inter-board terminals 43. In this embodiment, the purpose is to reduce the stress applied to the inter-board terminals 43 by dividing the inter-board terminal binder into multiple stages instead of one stage, regardless of the length of the inter-board terminals 43. Therefore, the two-stage inter-board terminal binders 61 and 62 of this embodiment are completely different from the components (61.1 and 61.2) disclosed in Patent Document 1.

Furthermore, in this embodiment, the sum Tsum of the thicknesses of the lower binder 61 and the upper binder 62 in the stacking direction of the substrates 31 and 32 is greater than the terminal exposed length Lex, which is the distance between the lower binder 61 and the upper binder 62.

By bundling and holding multiple inter-board terminals 43 within a range of more than half the distance between the boards 31 and 32 using resin inter-board terminal binders 61 and 62, the effects of bundling, such as ensuring the relative positional accuracy of the multiple terminals 43, are effectively demonstrated without being diminished.

Second Embodiment
An inter-board terminal module 602 according to a second embodiment will be described with reference to Fig. 11. In the second embodiment, the upper binder is divided into multiple parts for one lower binder in the binding direction. In the example shown in Fig. 11, two upper binders 63 and 64 are provided for one lower binder 61.

When an annular, one-piece lower binder 61R as shown in Figure 9 is used, if the upper binders located on the left and right sides of the figure relative to the rotation axis O are each split into two, the upper binder will be split into four parts for each lower binder 61R. When split-type lower binders 61A, 61B as shown in Figure 10 are used, the upper binder will be split into two parts for each lower binder 61A, 61B, for example, on the left and right sides of the figure relative to the rotation axis O.

The lower binder 61, which is fixed to the motor frame 840, undergoes little dimensional change in the binding direction, while the upper binder, which is affected by the expansion and contraction of the connector housing 50, is subjected to stress that causes it to expand and contract in the binding direction. Therefore, by dividing the upper binder into multiple parts 63 and 64 in the binding direction to give it flexibility, stress can be alleviated.

(Third embodiment)
12, a third embodiment of the inter-board terminal module 603 includes a plurality of damper members 66 that are expandable in height and disposed between a lower binder 61 and an upper binder 62 that are adjacent to each other in the stacking direction of the boards 31 and 32. For example, the damper members 66 are formed by folding a strip of spring metal in an accordion-like manner. This arrangement further reduces the stress applied to the inter-board terminals 43 due to the expansion and contraction of the connector housing 50.

(Fourth embodiment)
13 is a combination of the third and fourth embodiments, and includes a plurality of damper members 66 between the separable upper binders 63, 64 and the lower binder 61. The fourth embodiment has the same effects as the second and third embodiments.

Fifth Embodiment
In the board-to-board terminal module 605 of the fifth embodiment shown in Fig. 14, compared to the board-to-board terminal module 601 of the first embodiment, an insertion guide 68 is also provided on the upper binder 62, protruding outward in the stacking direction, i.e., on the opposite side from the lower binder 61. As can be inferred from Fig. 4, the insertion guide 68 passes through a hole formed in the connector-side board 32 and fits into a guide hole formed in the top plate portion 561 of the connector housing 50. This improves the ease of assembly in the process of covering the inter-board terminal module 605 with the connector housing 50.

(Other embodiments)
(a) In a configuration in which three or more substrates are provided in layers, a plurality of inter-board terminals are electrically connected between the substrates by a press-fit method. Furthermore, a plurality of inter-board terminal binders for bundling the plurality of inter-board terminals are provided in multiple stages between the substrates. Similar to the third and fourth embodiments, a plurality of damper members 66 may be provided between the inter-board terminal binders in each stage.

(b) The inter-board terminal binder is not limited to two layers, but may be divided into three or more layers in the stacking direction of the boards.

(c) The number, size, shape, etc. of the connectors provided on the top plate portion 561 of the connector housing 50 are not limited to those exemplified in the above embodiment. The number of connectors may be one or more .

(d) In the example shown in Figure 4, the connector terminals 45 are electrically connected to the connector side substrate 32 using a press-fit method, but the connector terminals 45 may also be soldered to the connector side substrate 32.

(e) The press-fit connection shape is not limited to the example shown in the figures of the above embodiment. For example, as disclosed in Figures 10 to 12 of Japanese Patent No. 6,443,055 (corresponding US publication: US 10,424,991 B2), a shape in which a pair of opposing tabs elastically contact the side surfaces of the terminal may also be used.

(f) The drive unit 800 of the present invention is not limited to being used as a steering assist motor in an electric power steering device, but may also be used as a reaction motor or steering motor in a steer-by-wire system, or as a drive unit for any other motor.

As mentioned above, the present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the spirit of the invention.

10...Control unit,
31: Motor side board, 32: Connector side board,
43 ... inter-board terminal, 45 ... connector terminal,
50...Connector housing,
561: Top plate portion, 562: Outer cylinder portion,
57, 58...Connector,
61: Lower binder (inter-board terminal binder)
62: Upper binder (inter-board terminal binder),
63, 64...(separable type) upper binder (inter-board terminal binder),
80...Motor, 860...Stator, 865...Rotor.

Claims (4)

A drive device in which a motor (80) including a stator (860) and a rotor (865) and a control unit (10) that is provided on one side of the motor in the axial direction and drives and controls the motor are integrally configured,
a metal motor frame (840) provided at an end of the motor on the control unit side in the axial direction;
two or more circular substrates (31, 32) on which electronic components constituting the control unit are mounted, the substrates being arranged in layers on the opposite side of the motor from the motor frame;
a resin connector housing (50) having a bottomed cylindrical shape including a top plate portion (561) facing the motor frame and an outer tubular portion (562) extending from the outer edge of the top plate portion toward the motor and having an end fixed to the motor or the motor frame, the connector housing (50) being made of resin and having one or more connectors (57, 58) provided on the top plate portion;
a plurality of connector terminals (45) fixed to the connector housing, one end of which is electrically connected to the board on the top plate portion side, and the other end of which is exposed at the opening of the connector;
a plurality of inter-board terminals (43) arranged in an arc shape along the outer periphery of the substrates and electrically connected between the substrates by a press-fit method;
a plurality of resin inter- board terminal binders (61-64) that are provided between the substrates in a stacking direction of the substrates and divided into a plurality of stages, each binder including an arc-shaped portion corresponding to the arrangement of the plurality of inter-board terminals, and that bundle and hold the plurality of adjacent inter-board terminals;
A drive unit comprising: The board-to-board terminal binder is composed of two layers: a lower layer binder (61) on the motor frame side and an upper layer binder (62-64) on the top plate side,
The drive device according to claim 1 , wherein the sum (Tsum) of the thicknesses of the lower binder and the upper binder in the stacking direction of the substrate is greater than the terminal exposed length (Lex), which is the distance between the lower binder and the upper binder. The inter-board terminal binder is composed of two stages: a lower stage binder (61) on the motor frame side and an upper stage binder (63, 64) on the top plate side,
3. The drive device according to claim 1, wherein the upper binder is divided into a plurality of parts for one lower binder in a bundling direction in which the plurality of inter-board terminals are bundled. A drive unit as described in any one of claims 1 to 3, wherein multiple damper members (66) whose height is adjustable are provided between adjacent inter-board terminal binders in the stacking direction of the boards.