JP2023042465A - Driving unit - Google Patents

Abstract

To provide a driving unit that prevents the generation of an excessive stress at a connection of a connector terminal and an end substrate.SOLUTION: A connector housing 50 has a bottomed cylindrical shape having a top plate part 561 and an outer cylinder part 562 extending from an outer edge of the top plate part 561. The connector housing 50 has one or more connectors 57, 58 each having a frontage directed to the opposite side of an end substrate 33. Two or more connector terminals 45 are provided for one connector, and the plurality of connector terminals are connected to the end substrate 33 at one end, and inserted through terminal insertion holes 54 formed in the bottom of the frontages of the connectors 57, 58 and exposed to the frontages of the connectors at the other end. A connector terminal binder 65 holds an intermediate part of the plurality of connector terminals 45 to bind a group of connector terminals 45 corresponding to the connectors. The connector terminals 45 are inserted into the terminal insertion holes 54 to prevent a situation in which the connector terminals are brought into contact with inner walls of the terminal insertion holes 54 and deformed following the connector housing 50.SELECTED DRAWING: Figure 4

Description

The present invention relates to a driving device.

Conventionally, there is known a driving device in which a motor and a control unit are integrated.

For example, in the integrated electric power steering apparatus disclosed in Patent Document 1, the control unit includes a wiring board on which an inverter circuit and a CPU are mounted, a housing for accommodating the wiring board, and a connector provided on the housing. It is configured as a modular module. Connector terminals of a power line terminal and a signal line terminal are connected between the connector and the wiring board.

WO2017/068636

Hereinafter, in this specification, a resin housing integrally provided with a connector is referred to as a "connector housing". In the device disclosed in Patent Document 1, a portion of a crank-shaped connector terminal extending in a direction orthogonal to the motor shaft is embedded in the top plate of the connector housing, and the tip of the terminal extends from the inner wall surface of the connector housing toward the wiring board. protrudes to In other words, it can be recognized that the connector terminals are insert-molded in the connector housing.

This connector housing is a large-sized resin component having a diameter equivalent to the outer diameter of the motor. Warping and deformation are likely to occur in the central region. When the connector terminal is firmly fixed to the connector housing by insert or outsert molding, the connector terminal is displaced following the relative displacement of the connector housing caused by the difference in the coefficient of linear expansion of each member when the temperature changes. As a result, an excessive stress is applied to the connection between the connector terminal and the substrate and to the electronic components around the connection, which may cause breakage of the connection or failure of the electronic component.

In addition, in a drive device in which two or more substrates are arranged in layers within the control unit, the axial length of the outer cylindrical portion of the connector housing is long and the size becomes larger, so the displacement when the temperature changes is even more pronounced. become. In this specification, the substrate closest to the connector among the two or more substrates is called an "end substrate". In a driving device having two or more substrates, it is more important to prevent excessive stress from occurring in the connecting portions between the connector terminals and the substrates when the temperature changes.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a driving device that prevents excessive stress from being generated at the connecting portion between the connector terminal and the end substrate.

The driving device according to the present invention is integrally constructed with a motor (80) including a stator (860) and a rotor (865), and a control unit (10) provided on one axial side of the motor for driving and controlling the motor. ing. This driving device includes a motor frame (840) made of metal, one or more substrates, a connector housing (50) made of resin, a plurality of connector terminals (45), and one or more connector terminals made of resin. a binder (65);

The motor frame is provided at the end on the control unit side in the axial direction of the motor. The one or more substrates are provided on the opposite side of the motor frame from the motor and include an end substrate (33) provided on the farthest side from the motor frame. One or more substrates are mounted with electronic components constituting a control unit.

The connector housing has a top plate portion (561) facing the end board, and an outer cylinder 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. It has a cylindrical shape. The connector housing has one or more connectors (57, 58) on the top plate portion with openings facing the side opposite to the end substrate.

Two or more connector terminals are provided for one connector, one end of which is connected to the end board, and the other end of which is inserted through a terminal insertion hole (54) formed at the bottom of the frontage of the connector. exposed to.

A connector terminal binder holds intermediate portions of a plurality of connector terminals so as to bundle a group of connector terminals corresponding to each connector or to bundle a plurality of groups of connector terminals corresponding to a plurality of adjacent connectors.

Each connector terminal is inserted through the terminal insertion hole so as to be restrained from being displaced following the connector housing due to contact with the inner wall of the terminal insertion hole. For example, each connector terminal may be fitted with a gap so as to have a gap with the inner wall of the terminal insertion hole. Alternatively, the connector terminal may be configured to slide on the inner wall surface of the terminal insertion hole.

In addition, since the connector terminals are bundled with the connector terminal binder, the relative positional accuracy of each connector terminal is ensured. Therefore, stress generated between each connector terminal and the inner wall of the terminal insertion hole is suppressed from being propagated to the connecting portion with the end substrate. Therefore, the driving device of the present invention can prevent excessive stress from being generated at the connecting portion between the connector terminal and the end substrate when the temperature changes. Therefore, it is possible to prevent breakage of the connecting portion and failure of electronic components around the connecting portion.

1 is a schematic configuration diagram of an electric power steering device to which a driving device is applied; FIG. FIG. 2 is a partial cross-sectional view showing a motor portion of the drive device; The III direction arrow directional view of FIG. 4 is a schematic cross-sectional view of the control unit section according to the first embodiment; FIG. FIG. 4 is an enlarged cross-sectional view showing an example of a connection configuration by (a) soldering and (b) press-fit connection between a terminal and a substrate; The top view of (a) connector terminal binder of 1st Embodiment, and (b) board|substrate. FIG. 4 is a schematic cross-sectional view before assembly of the control unit portion according to the first embodiment; FIG. 4 is a schematic cross-sectional view of the control unit according to the first embodiment, which is in the process of being assembled; The figure explaining the relationship between the connector terminal and the terminal penetration hole in a comparative example. The figure explaining the relationship between the connector terminal and the terminal penetration hole in (a) one aspect of this embodiment, and (b) another aspect. FIG. 5 is a schematic cross-sectional view of a control unit section according to the second embodiment; FIG. 5 is a schematic cross-sectional view of a control unit section according to a third embodiment; FIG. 4 is a schematic cross-sectional view of the control unit portion of the reference embodiment in the middle of assembly.

A plurality of embodiments of the driving device according to the present invention will be described below with reference to the drawings. In a plurality of embodiments, substantially the same configurations are denoted by the same reference numerals, and descriptions thereof are omitted. The first to third embodiments are collectively referred to as "this embodiment". The drive device of the present embodiment is applied, for example, as a steering assist motor for an electric power steering device, and is integrally configured with a motor and a control unit that drives and controls the motor.

[Configuration of electric power steering device]
A schematic configuration of the electric power steering device 99 will be described with reference to FIG. Although FIG. 1 shows a rack-assist type electric power steering apparatus, the driving apparatus 800 of the present embodiment can also be applied to a column-assist type electric power steering apparatus. A steering system 90 including an electric power steering device 99 includes a steering wheel 91, a steering shaft 92, a pinion gear 96, a rack shaft 97, wheels 98, an electric power steering device 99, and the like.

A steering shaft 92 to which a steering wheel 91 is connected is provided with a torque sensor 93 for detecting steering torque. A pinion gear 96 that meshes with a rack shaft 97 is provided at the tip of the steering shaft 92 . When the driver rotates the steering wheel 91 , the rotary 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 corresponding to the amount of displacement of the rack shaft 97 .

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

A vehicle system connector 57 of the control unit 10 is supplied with DC power from a vehicle power source 905 and receives and inputs/outputs communication signals with a vehicle communication network (“CAN” in the figure) 906 . A sensor signal detected by the torque sensor 93 is input to the signal system connector 58 via a harness 94 . In this manner, the vehicle system connector 57 and the signal system connector 58 are configured as connectors having different frontages.

[Configuration of drive device]
The overall configuration of the driving device 800 will be described with reference to FIGS. 2 and 3. FIG. A direction parallel to the rotation axis O of the motor 80 shown in FIG. 2 is defined as an "axial direction", and a view seen from the upper side of FIG. 2 in the axial direction is called a plan view. The control unit 10 is provided on one side of the motor 80 in the axial direction. In other words, the driving device 800 has a so-called "mechanical and electrical integrated type" configuration.

The motor 80 has a motor case 830, a motor frame 840, a stator 860, a rotor 865, and the like. The motor case 830 is formed in a substantially bottomed cylindrical shape including a bottom portion 831 and a cylindrical portion 832, and the control unit 10 is provided on the opening side. A groove-forming wall 834 having a small thickness is formed at the opening-side end of the cylindrical portion 832 with a stepped portion 833 interposed therebetween.

The stator 860 is fixed inside the cylindrical portion 832 of the motor case 830 and has three-phase motor windings 880 wound thereon. A rotating magnetic field is formed in the stator 860 by controlling the energization of the motor windings 880 by the control unit 10 . The rotor 865 is provided inside the stator 50 and has a shaft 870 fixed at its center. The shaft 870 is rotatably supported by a front bearing 871 held on the bottom 831 of the motor case 830 and a rear bearing 872 held on the motor frame 840 .

The rotor 865 is provided with a plurality of permanent magnets 867 on the outer circumference of the rotor core 866 . Rotor 865 rotates around shaft 870 due to a rotating magnetic field formed in stator 860 . A sensor magnet 875 for detecting a rotation angle is provided at the end of the shaft 870 on the control unit 10 side.

The motor frame 840 is made of aluminum alloy or the like, and has a frame portion 841, a flange portion 842, a heat sink 845, and the like. The frame portion 841 is press-fitted inside the motor case 830 . A flange portion 842 formed on the outer periphery of the frame portion 841 abuts on the stepped portion 833 of the motor case 830 . A seal groove 843 filled with an adhesive is formed in an annular space defined by the outer wall of the frame portion 841, the control unit 10 side surface of the flange portion 842, and the inner wall of the groove forming wall 834 of the motor case 830. .

The connector housing 50 is made of a resin material such as PBT, and has a bottomed tubular shape having a top plate portion 561 and an outer tubular portion 562 . A convex portion 563 protruding in the axial direction is annularly formed at the tip of the outer cylindrical portion 562 . The outer cylindrical portion 562 is fixed to the motor 80 or the motor frame 840 by inserting the convex portion 563 into the seal groove 843 . The top plate portion 561 is provided with connectors 57 and 58 whose frontage faces the side opposite to the motor 80 . Since the connector housing 50 is a large resin part having a diameter corresponding to the outer diameter of the motor 80 and has a U-shaped cross section, the central region of the top plate 561 is likely to warp or deform when the temperature changes. .

FIG. 3 shows one arrangement example of the connectors 57 and 58. As shown in FIG. Although FIG. 3 is a view viewed in the direction of arrow III in FIG. 2, the scale is not the same as that of FIG. 2, but is the same as that of FIGS. shown to match.

The vehicle system connector 57 and the signal system connector 58 may be provided as one set as shown in FIG. 3, or may be redundantly provided as two sets in another arrangement example. The configuration in which two pairs of connectors 57 and 58 are provided is mainly employed in a "complete two-system" driving device in which two systems of inverter circuits are connected to separate power sources and various signals are redundantly input/output. be. On the other hand, in a "dual drive system" drive device in which two systems of inverter circuits are connected in parallel to a common power source and various signals are shared between the systems, a pair of connectors 57 and 58 are mainly provided.

The vehicle system connector 57 is connected to two power supply terminals 45p including a positive power supply terminal connected to the positive terminal of the vehicle power supply 905 and a ground terminal connected to the ground, and a vehicle communication network 906 such as CAN. For example, seven communication terminals 45c are provided. The power supply terminal 45p through which a large current flows has a connection portion with the harness formed in a prism shape, and the substrate side is divided into, for example, three columnar shapes. The signal system connector 58 is provided with, for example, eight sensor terminals 45 s connected to the harness 94 from the torque sensor 93 . The symbols "45p", "45c", and "45c" indicating the types of the connector terminals 45 are used only in FIG. In the figures after FIG. 4 , they are uniformly referred to as “connector terminals 45 ” without distinguishing their uses.

One or more substrates on which electronic components constituting the control unit 10 are mounted are housed inside the connector housing 50 . One or more substrates are provided on the side of the motor frame 840 opposite to the motor 80 (upper side in FIG. 2). The one or more boards also include an “end board” provided on the farthest side from the motor frame 840 .

Next, the configuration of the control unit of each embodiment will be described in order. As for the reference numerals of the control units of the first to third embodiments, the embodiment number is attached to the third digit following "10". The first and second embodiments comprise a single substrate. In this case, one substrate is the "end substrate". The third embodiment comprises two substrates, including one “general substrate” and one “end substrate”, arranged in layers. In addition, as another embodiment, a configuration including three or more substrates will be mentioned.

(First embodiment)
The configuration of the control unit 101 of the first embodiment will be described with reference to FIGS. 4 to 6. FIG. FIG. 4 shows a schematic cross-sectional view of the whole, and FIGS. 6A and 6B show plan views of the connector terminal binder 65 and the substrate 33, respectively.

As shown in FIG. 4, the control unit 101 is provided with one board 33 . A single substrate 33 is a substrate attached to the motor frame 840 and corresponds to an “end substrate” closest to the motor frame 840 .

As shown in FIG. 6B, connector terminal holes 345 corresponding to the two connectors 57 and 58 are formed in the substrate 33 near the center. Two or more connector terminals 45 are provided for one connector, and one end thereof is connected to the substrate 33 . The other ends of the connector terminals 45 are exposed at the openings of the connectors 57 and 58 through terminal insertion holes 54 formed at the bottom of the openings of the connectors 57 and 58 .

Unlike the device disclosed in Patent Document 1 (International Publication No. 2017/068636), this embodiment does not have a configuration in which crank-shaped connector terminals are insert-molded on the top plate portion of the connector housing. The plurality of connector terminals 45 of this embodiment are linear, and are connected so as to connect the frontages of the connectors 57 and 58 and the board 33 with straight lines in the axial direction of the motor 80 .

4 shows two connector terminals 45 including a communication terminal and a power supply terminal in the vehicle system connector 57 and two sensor terminals in the signal system connector 58 according to the sectional line of FIG. However, in this embodiment, it is meaningful that there are two or more connector terminals 45 corresponding to each of the connectors 57 and 58, and the types and number of the connector terminals 45 are not considered. A plurality of connector terminals 45 corresponding to each of the connectors 57 and 58 are called "a group of connector terminals".

FIGS. 5A and 5B show an example of the electrical connection between the connector terminal 45 and the substrate 33, taking as an example the connection point between the connector terminal 45 and the substrate 33. FIG. Regarding "connection between a terminal and a substrate" in the following specification, if it is obvious that it means an electrical connection, the description of "electrically" will be omitted as appropriate. A connection portion 38 such as a via hole is provided in the terminal hole 345 of the substrate 33 . The connection portion 38 is electrically connected to connection portions of electronic components and other terminals via conductive patterns, bus bars, and the like (not shown).

As shown in FIG. 5A, the terminal 45 and the connecting portion 38 of the substrate 33 may be soldered by solder WD. As shown in FIG. 5B, the press-fit connection may be made by press-fitting a press-fit portion 48 elastically deformable at the end of the terminal 45 into the terminal hole 345 .

As shown in FIG. 6( a ), a connector terminal binder 65 made of resin binds a plurality of groups of connector terminals 45 corresponding to adjacent vehicle connectors 57 and signal connectors 58 together. hold part. In addition, a meat steal 649 may be provided in the lean portion. By bundling the plurality of connector terminals 45 with the connector terminal binder 65, the relative positional accuracy of the plurality of connector terminals 45 is ensured.

In addition, one or more convex stopper portions 656 are formed on the substrate 33 side of the connector terminal binder 65 to regulate the distance from the substrate 33 . Although the position of the stopper portion 656 is illustrated in FIG. 6(a), it may be provided at any well-balanced position. 4, the stopper portion 656 is shown regardless of the position of the cross-sectional line in FIG. 3 for the sake of convenience.

A plurality of connector terminals 45 are formed with flanges 46 that contact the surface of the connector terminal binder 95 on the substrate 33 side. The flange portion 46 determines the position of the connector terminal 45 in the height direction with respect to the connector terminal binder 95 . Therefore, the connector terminal 45 is positioned in the axial direction of the motor 80 via the connector terminal binder 65 whose distance from the board 33 is restricted by the stopper portion 656 .

Also, unlike the connector housing 50 exposed to the external environment, the connector terminal binder 65 is housed inside the connector housing 50 . Therefore, the connector terminal binder 65 is made of a resin material that does not require consideration of weather resistance as compared to the connector housing 50, that is, a resin material with low weather resistance. For example, the connector housing 50 is made of weatherproof grade PBT, while the connector terminal binder 65 is made of non-weatherproof grade PBT. Thereby, material cost can be reduced.

Returning to FIG. 4 , the resin connector housing 50 has a bottomed tubular shape in which an outer tubular portion 562 extends from the outer edge of a top plate portion 561 facing the substrate 33 toward the motor 80 . A convex portion 563 formed at the tip of the outer cylindrical portion 562 is inserted into an annular seal groove 843 filled with an adhesive. When the connector housing 50 is assembled, the load receiving portion 564 provided at the end of the outer cylindrical portion 562 contacts the frame outer edge portion 844 of the motor frame 840 .

As described above with reference to FIG. 3 , the top plate portion 561 is provided with the connectors 57 and 58 whose frontage faces the side opposite to the end substrate 33 . A terminal insertion hole 54 through which each connector terminal 45 can be inserted is formed at the bottom of the frontage of the connectors 57 and 58 .

In a typical embodiment, the center positions of the terminal insertion holes 54 and the connector terminals 45 are aligned, and the inner diameter of the terminal insertion holes 54 or the inner dimension of the square hole is set larger than the outer diameter of the connector terminals 45 or the outer dimension of the prism. ing. That is, each connector terminal 45 is fitted to the inner wall of the terminal insertion hole 54 with clearance so as to have a clearance. Even if there is a gap around the outer periphery of the connector terminal 45, there is no risk of water or foreign matter entering when the harness is inserted into the connectors 57 and 58. FIG.

Next, with reference to FIGS. 7 and 8, the procedure for assembling the control unit will be described. As shown in FIG. 7, first, the board 33 is fixed to the motor frame 840 with screws 41, and the motor terminals 42 connected to the motor windings 880 are connected. Next, a bundle of a plurality of connector terminals 45 bundled with a connector terminal binder 65 is attached to the board 33 . At this time, the positional accuracy of the connector terminal 45 in the height direction is ensured by the stopper portion 656 of the connector terminal binder 65 and the flange portion 46 of the connector terminal 45 .

FIG. 8 shows the assembled state thus far. In FIG. 8, the control unit 101 of this embodiment has a structure in which a bundle of a plurality of connector terminals 45 assembled integrally with the motor 80 and a connector housing 50 made of resin are separated. In the final assembly process, the connector housing 50 is placed over the substrate 33 to which one ends of the connector terminals 45 are connected, and the other ends of the connector terminals 45 are inserted through the terminal insertion holes 54 and exposed to the openings of the connectors 57 and 58. .

At the same time, the convex portion 563 of the connector housing 50 is inserted into the seal groove 843 filled with adhesive, and the outer cylindrical portion 562 is fixed to the motor frame 840 . In addition, since the motor frame 840 is fixed to the motor 80 , it may be expressed that the outer tube portion 562 is fixed to the motor 80 .

9, 10(a) and 10(b), the effects of this embodiment will be described in comparison with a comparative example. 9, 10(a) and 10(b) schematically show the relationship between the connector terminals 45 and the terminal insertion holes 54 in the bottom plate portion 540 of the frontage of the connector 57. FIG. The frontage of the connector 58 is the same.

In the comparative example shown in FIG. 9, a connector terminal 45 is insert-molded or outsert-molded in a connector housing 50 made of resin. In other words, the connector terminals 45 are rigidly fixed to the connector housing 50 . When the connector housing 50 is displaced relative to the connector terminals 45 due to the difference in coefficient of linear expansion between resin and metal in expansion and contraction due to temperature change, the connector terminals 45 are displaced following the connector housing 50 . Due to this displacement, excessive stress is applied to the connecting portion 38 between the connector terminal 45 and the substrate 33 and to the electronic component ED soldered around the connecting portion 38, as indicated by the dashed arrow, causing the connecting portion 38 to break and the electronic components to malfunction. Failure or the like of the component ED may occur.

On the other hand, in one aspect of the present embodiment shown in FIG. 10A, the connector terminal 45 is fitted with a clearance fit so as to have a clearance between it and the inner wall of the terminal insertion hole 54 . Therefore, even if the connector housing 50 is displaced relative to the connector terminals 45 when the temperature changes, the connector terminals 45 remain in their original positions without following. That is, the displacement of the connector terminal 45 following the connector housing 50 due to contact with the inner wall of the terminal insertion hole 45 is suppressed to zero level.

In another aspect of the present embodiment shown in FIG. 10(b), there is no visible gap between the connector terminal 45 and the inner wall of the terminal insertion hole 54. As shown in FIG. However, the connector terminal 45 is configured to slide on the inner wall surface of the terminal insertion hole 54 without being dragged by friction with the inner wall of the terminal insertion hole. For example, the outer wall of the connector terminal 45 is subjected to a lubricating surface treatment LB, and the portion of the terminal insertion hole 54 is formed of a highly self-lubricating resin material. Therefore, the connector terminal 45 is restrained from being displaced following the connector housing 50 due to contact with the inner wall of the terminal insertion hole 45 . In this case, even if the follow-up displacement of the connector terminal 45 does not become zero, it should be attenuated to a certain ratio or less with respect to the displacement of the connector housing 50 .

In one aspect or another aspect of the present embodiment, the displacement of the connector terminal 45 following the relative displacement of the connector housing 50 due to the difference in the coefficient of linear expansion of each member when the temperature changes is suppressed. Therefore, due to the follow-up displacement of the connector terminal 45, excessive stress is prevented from being applied to the connection portion 38 with the substrate 33 and the electronic components soldered around the connection portion 38. FIG. Therefore, the durability of the connecting portion 38 with the substrate 33 and the peripheral solder joint portion can be ensured.

(Action and effect of the present embodiment)
(1) In this embodiment, the bundle of the connector terminals 45 bound by the connector terminal binder 65 and the resin connector housing 50 are separated. Each connector terminal 45 is inserted through the terminal insertion hole 54 so as to be restrained from being displaced following the connector housing 50 due to contact with the inner wall of the terminal insertion hole 54 . Therefore, it is avoided that the connection portion 38 with the substrate 33 is affected by the relative displacement of the connector housing 50 when the temperature changes through the connector terminal 45 .

(2) By holding the intermediate portions of the plurality of connector terminals 45 so that the connector terminal binder 65 bundles the plurality of connector terminals 45, the relative positional accuracy of the connector terminals 45 is ensured. Further, the connector terminal 45 is positioned in the axial direction of the motor 80 by the stopper portion 656 of the connector terminal binder 65 and the flange portion 46 of the connector terminal 45 . Therefore, connector fitting failure can be prevented.

(3) Each connector terminal 45 is connected between the openings of the connectors 57 and 58 and the substrate 33 so as to be connected in a straight line in the axial direction of the motor 80 . Minimizing the length of the connector terminal 45 contributes to miniaturization of the control unit 10 and prevents sliding wear at the contact portion with the harness-side female connector.

(4) The load receiving portion 564 provided at the end of the outer cylindrical portion 562 of the connector housing 50 is in contact with the motor frame 840 . As a result, when an excessive insertion load is generated when the harness-side female connector is inserted into the connectors 57 and 58, concentration of stress on the fitting portion and the contact portion is prevented.

(5) In molding the connector housing 50, which is a large resin part, the number of molding steps is reduced by eliminating insert molding of metal parts such as connector terminals. In addition, the component cost can be reduced by making the connector terminal 45 simple and short and linear.

(6) Since the bundle of a plurality of connector terminals 45 and the resin connector housing 50 are separated, it is possible to flexibly adapt to design changes of the frontages of the connectors 57 and 58 and the terminals of the connector terminals 45 .

(Second embodiment)
Next, with reference to FIG. 11, the control unit 102 of the second embodiment will be described. In the second embodiment, two connector terminal binders 65 are individually provided for the connectors 57 and 58 . Each connector terminal binder 65 holds intermediate portions of a plurality of connector terminals 45 so as to bundle a group of connector terminals 45 corresponding to each connector 57 , 58 .

Each connector terminal binder 65 is provided with a stopper portion 656 , and each connector terminal 45 is formed with a collar portion 46 . Therefore, the positional accuracy of the connector terminals 45 in the height direction is ensured for each of the connectors 57 and 58 .

When the number of frontages of the connectors 57 and 58 is large or when the distance between the connectors 57 and 58 is wide, providing one connector terminal binder 65 in common increases the size. Therefore, due to expansion and contraction of the connector terminal binder 65 itself, it becomes difficult to secure the relative positional accuracy of the plurality of connector terminals 45 . Therefore, by dividing the connector terminal binder 65 into relatively small connector terminal binders 65 , it is advantageous to ensure the relative positional accuracy of the plurality of connector terminals 45 .

(Third embodiment)
A control unit 103 according to the third embodiment will be described with reference to FIG. The control unit 103 of the third embodiment includes two substrates, a general substrate 31 and an end substrate 33, which are arranged in layers. Regardless of the functions of the electronic components mounted on the board, the board provided on the farthest side from the motor frame 840, that is, on the side closest to the connectors 57 and 58 is called an "end board". is called a “general substrate”.

The general board 31 is fixed to the motor frame 840 with screws 41 and connected to the motor terminals 42 connected to the motor windings 880 . A plurality of connector terminals 45 are connected to the end substrate 33 corresponding to the substrate 33 of the first embodiment. For example, an inverter circuit that energizes the motor windings 42 is mounted on the general board 31 . Components such as a filter circuit and a communication driver are mounted on the end substrate 33 .

A plurality of inter-board terminals 43 are connected between the general board 31 and the end board 33 . The plurality of inter-board terminals 43 are arranged in a radially outer region with respect to the central region where the connector terminals 45 are arranged. Further, the resin-made inter-board terminal binder 63 holds the intermediate portions of the plurality of inter-board terminals 43 so as to bundle the plurality of inter-board terminals 43 adjacent to each other. However, the inter-board terminal binder 63 may not be provided.

As in the first embodiment, each connector terminal 45 is inserted through the terminal insertion hole 54 so as to be restrained from being displaced following the connector housing 50 due to contact with the inner wall of the terminal insertion hole 54 . .

In the two-board configuration, the axial length of the outer cylindrical portion 562 of the connector housing 50 is longer than that in the one-board configuration, and the size becomes larger, so the displacement when the temperature changes becomes more pronounced. Therefore, the following effect of the connector terminal 45 is suppressed, and the effect of preventing excessive stress from being generated in the connecting portion 38 between the connector terminal 45 and the end substrate 33 is exhibited more effectively.

(Reference form)
The control unit 108 of the reference form will be described with reference to FIG. 13 . In the control unit 108 of the reference embodiment, the connector terminals 45 are insert-molded or outsert-molded in the connector housing 504 . A commercially available movable socket connector 72 is surface-mounted on the substrate 33 . When assembling the connector housing 504 to the motor 80 , the plurality of connector terminals 45 are connected to respective terminals of the socket connector 72 .

When the connector housing 504 is displaced due to expansion/contraction or warping due to temperature changes, the terminal connection positions of the movable socket connector 72 move flexibly, thereby preventing excessive stress from occurring. Therefore, the influence of displacement of the connector housing 504 is alleviated.

(Other embodiments)
(a) Unlike the third embodiment, the number of general substrates is not limited to one, and may be two or more. INDUSTRIAL APPLICABILITY The present invention can be widely applied to a driving device provided with two or more substrates in which one or more general substrates and one end substrate are layered.

(b) One or more connectors may be provided on the top plate portion 561 of the connector housing 50 . The number of connectors and the use of each connector terminal are not limited to the example of the above embodiment, and may be appropriately set according to needs.

(c) The driving device 800 of the present invention is not limited to a steering assist motor for an electric power steering device, but can be used as a reaction force motor or steering motor for a steer-by-wire system, or any other motor driving device. good too.

As described above, the present invention is by no means limited to the above embodiments, and can be embodied in various forms without departing from the spirit of the present invention.

10 (101-103) ... control unit,
33 ... substrate (end substrate),
45 ... connector terminal,
50 ... connector housing, 54 ... terminal insertion hole,
561 ... top plate portion, 562 ... outer cylinder portion,
57, 58 ... connectors,
65 ... connector terminal binder,
80... Motor, 860... Stator, 865... Rotor.

Claims (6)

A driving device in which a motor (80) including a stator (860) and a rotor (865) and a control unit (10) provided on one axial side of the motor and controlling the driving of the motor are integrally constructed. hand,
a metal motor frame (840) provided at the end on the control unit side in the axial direction of the motor;
One board provided on the opposite side of the motor frame to the motor, including an end board (33) provided on the farthest side from the motor frame, on which electronic components constituting the control unit are mounted. the above substrates;
It has a top plate portion (561) facing the end substrate, and an outer cylindrical 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. a resin-made connector housing (50) having a cylindrical shape with a bottom and having one or more connectors (57, 58) on the top plate portion with frontages facing the side opposite to the substrate;
Two or more are provided for one connector, one end is connected to the end board, and the other end is inserted through a terminal insertion hole (54) formed in the bottom of the frontage of the connector and exposed to the frontage of the connector. a plurality of connector terminals (45) for
One or more holding intermediate portions of the plurality of connector terminals so as to bundle a group of the connector terminals corresponding to each connector, or to bundle a plurality of groups of the connector terminals corresponding to a plurality of adjacent connectors. a connector terminal binder (65) made of resin;
with
Each of the connector terminals is inserted through the terminal insertion hole so as to be restrained from being displaced following the connector housing due to contact with an inner wall of the terminal insertion hole. 2. The driving device according to claim 1, wherein the connector terminal is connected between the frontage of the connector and the end board so as to be connected by a straight line in the axial direction of the motor. The connector terminal binder is formed on the end substrate side with one or more convex stopper portions (656) for regulating the distance from the end substrate,
3. The driving device according to claim 1, wherein the connector terminal is formed with a collar portion (46) that abuts on the surface of the connector terminal binder on the side of the end board, and is positioned in the axial direction of the motor. The driving device according to any one of claims 1 to 3, wherein the connector housing is provided with a load receiving portion (564) contacting the motor frame at the end of the outer cylindrical portion. The driving device according to any one of claims 1 to 4, wherein the connector terminal binder is made of a resin material having lower weather resistance than the connector housing. The driving device according to any one of claims 1 to 5, further comprising two or more substrates (31) other than the end substrate and provided in layers.

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