JP2011152815A - Driving device of electric power steering - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving device of electric power steering, easy in assembling. <P>SOLUTION: This driving device of the electric power steering includes a steering shaft, a motor part and a cylindrical housing 3 for storing these. In the driving device of the electric power steering, the housing 3 is constituted by connecting a cylindrical first housing 3A and a cylindrical second housing 3B, and is formed so that the steering shaft is inserted inside, and a metallic plate 4 larger than an inner diameter of the housing 3 is sandwiched between the first housing 3A and the second housing 3B, and a plurality of wiring boards 5 mounted with a switching element 51 are arranged on a main surface of the metallic plate 4, and are respectively electrically connected to the plurality of wiring boards 5, and a metallic body 64 electrically connected to a stator 22 on the side facing the stator 22, is fixed to a through-hole 41 in a state of being electrically insulated from the metallic plate 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drive device for an electric power steering device that includes a switching element in a housing that houses a steering shaft.

Conventionally, a power circuit for controlling the electric power steering of an automobile has been provided in an ECU (Engine Control Unit) that comprehensively performs electrical control. This power circuit includes a plurality of switching elements, and wirings (u, v, w) for large currents connected to the respective switching elements extend from the power circuit to the stator of the motor that drives the steering shaft. It was.

  As a specific structure of the drive device for the electric power steering, a cylindrical housing that houses the steering shaft of the electric power steering is divided into a cylindrical first housing that houses the stator of the motor, and a cylindrical second housing. Connected to the inner wall of the second housing, multiple boards equipped with a power circuit including switching elements (power elements) are attached to the steering shaft in a circular pattern, and the steering shaft has a fin shape. A projection is proposed in which a wind sent from a rotating projection is applied to a switching element (see Patent Document 1).

JP-A-6-255502

  However, the electric power steering drive device described in Patent Document 1 is attached to the first housing, although there is no specific description about what kind of wiring is used to connect the stator and the switching element. In addition, there is a problem that it is complicated to connect the stator and the switching element attached to the second housing by wiring because a fine work in the housing is forced.

  Therefore, an object of the present invention is to provide an electric power steering drive device that is easy to assemble.

  An electric power steering drive device according to the present invention includes a steering shaft, a rotor having a permanent magnet attached to a part of the steering shaft, and a plurality of stators including an electromagnet provided so as to surround the rotor. An electric power steering drive device including a motor unit, a part of the steering shaft, and a cylindrical housing for housing the motor unit, wherein the housing includes a cylindrical first housing and a cylindrical first housing. A metal plate having a plurality of through-holes and formed so that the steering shaft is inserted inside the housing is disposed in the vicinity of the motor portion. Sandwiched between the first housing and the second housing and switching A plurality of wiring boards on which a child is mounted are provided on the main surface of the metal plate, and are electrically connected to the plurality of wiring boards, respectively, and are electrically connected to the stator on the stator side. The metal body is fixed to the through hole in a state insulated from the metal plate.

  The first housing and the second housing are directly connected, and at least one of the first housing and the second housing in a portion where the first housing and the second housing are connected It is preferable that a notch is provided in the metal plate, and an end of the metal plate is accommodated in the notch and is not exposed to the outside of the housing.

  The main surface of the metal plate on which the plurality of wiring boards are provided is a main surface opposite to the stator side of the metal plate, and the connection between the plurality of wiring boards and the metal body is It is preferable to be performed on the side opposite to the stator side of the metal plate.

  It is preferable that an insulator made of an insulating resin is provided between the through hole of the metal plate and the metal body.

  According to the electric power steering driving apparatus of the present invention, a steering shaft, a rotor having a permanent magnet attached to a part of the steering shaft, and a plurality of stators including an electromagnet provided so as to surround the rotor. An electric power steering driving apparatus including a motor unit configured and a cylindrical housing for housing a part of the steering shaft and the motor unit, wherein the housing has a cylindrical first housing and a cylindrical shape. A metal plate larger than the inner diameter of the housing, the metal plate having a plurality of through holes and formed so that the steering shaft is inserted inside the second housing. It is sandwiched between the first housing and the second housing in the vicinity. A plurality of wiring boards on which the mounting elements are mounted are provided on the main surface of the metal plate, and are electrically connected to the plurality of wiring boards, respectively, and are electrically connected to the stator on the stator side. A metal body fixed to the through hole in a state of being insulated from the metal plate, the stator assembled to the first housing and the metal plate provided with the plurality of wiring boards. The electrical connection can be performed by fixing the metal body and the metal plate, and further, the metal plate can be sandwiched between the first housing and the second housing. As a result, the assembly of the drive device for the electric power steering becomes easy.

  The first housing and the second housing are directly connected, and at least one of the first housing and the second housing in a portion where the first housing and the second housing are connected When the end of the metal plate is accommodated in the notch and is not exposed to the outside of the housing, entry of moisture, foreign matter, and the like from the outside can be suppressed.

  The main surface of the metal plate on which the plurality of wiring boards are provided is a main surface opposite to the stator side of the metal plate, and the connection between the plurality of wiring boards and the metal body is When it is performed on the side opposite to the stator side of the metal plate, the fluctuation of the electromagnetic field generated by the motor is reduced by the metal plate, so that the operation of the switching element is stabilized, and consequently the electric power steering. The behavior is stable.

  When an insulator made of an insulating resin is provided between the through hole of the metal plate and the metal body, even when vibration is applied or when the temperature rises due to heat generated by the switching element, This can be achieved by maintaining insulation between the metal plate and the metal body.

It is explanatory drawing of one Embodiment of the drive device of the electric power steering of this invention. It is explanatory drawing of the motor part shown in FIG. It is explanatory drawing of the stator bus bar in the drive device of the electric power steering of this invention. It is explanatory drawing of one Embodiment of the drive device of the electric power steering of this invention. It is the front view which looked at the main surface on the opposite side to the side which faces the stator of the metal plate shown in FIG. FIG. 6 is a cross-sectional view taken along line AA shown in FIG. 5. It is explanatory drawing of the state which removed the stator bus bar shown in FIG. It is explanatory drawing of the switching element in the drive device of the electric power steering of this invention. It is explanatory drawing of other embodiment of the drive device of the electric power steering of this invention. It is explanatory drawing of other embodiment of the drive device of the electric power steering of this invention. It is explanatory drawing of other embodiment of the drive device of the electric power steering of this invention. It is explanatory drawing of other embodiment of the drive device of the electric power steering of this invention.

  An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory view of an embodiment of a drive device for an electric power steering according to the present invention. The drive device for an electric power steering according to the present invention includes a steering shaft 1 and a permanent magnet attached to a part of the steering shaft 1. And a motor unit 2 composed of a plurality of stators 22 made of an electromagnet provided so as to surround the rotor 21 and a cylindrical housing 3 that houses a part of the steering shaft 1 and the motor unit 2. Contains. The housing 3 is formed by connecting a cylindrical first housing 3A and a cylindrical second housing 3B. The cylindrical first housing 3A and the cylindrical second housing 3B may be directly connected or may be connected via a metal plate 4 described later.

  The steering shaft 1 is for adjusting the direction of the tire by moving left and right. A rack gear 11 is formed on a part of the steering shaft 1, and the rack gear 11 meshes with a pinion gear (not shown) formed on a shaft 10 extending from a handle (not shown), and the rotation of the handle causes the steering shaft to rotate. 1 is transmitted. Further, a screw shaft 12 is formed on the other part of the steering shaft 1, and is constituted by the screw shaft 12 and a nut (not shown) fixed to a rotor 21 of the motor unit 2 described later. Power from a motor unit 2 described later is transmitted to the steering shaft 1 by a ball screw.

  The motor unit 2 includes a rotor 21 and a plurality of stators 22. As shown in FIG. 2, the rotor 21 is formed of a permanent magnet in a cylindrical shape, is attached to a part of the steering shaft 1, and when viewed in cross section, N poles and S poles are alternately arranged in the circumferential direction. It is an arranged configuration. Further, the stator 22 is made of an electromagnet, and the u-phase, the v-phase, the w-phase, the u-phase, the v-phase, the w-phase, the u-phase, the v-phase, the w-phase, the u-phase in the circumferential direction as viewed in a cross section on the inner wall of the housing. , V-phase, and w-phase are arranged once, and a total of 12 u-phase stators 22A, v-phase stators 22B, and w-phase stators 22C are provided.

One end of the coil constituting the four u-phase stators 22A is electrically connected to each other, and similarly constitutes one end of the coil constituting the four v-phase stators 22B and the four w-phase stators 22C. One end of each coil is electrically connected to each other, and all the stators 2
2 (the u-phase stator 22A, the v-phase stator 22B, and the w-phase stator 22C) are electrically connected to each other through a common bus bar 94.

  Specifically, a stator bus bar 91 connected to the u-phase stator 22A shown in FIGS. 3 and 4 and formed in an annular shape and arranged coaxially so as not to be in electrical contact with each other; A stator bus bar 92 connected to the stator 22B and a stator bus bar 93 connected to the w-phase stator 22C are provided. In FIG. 3, the stator bus bar 92 and the stator bus bar 93 are omitted. Here, the bus bar means an elongated metal plate-like wiring, and is formed of a low resistance material such as copper.

  Also, as shown in FIG. 3, four terminals 91A are provided so as to protrude from the outer periphery of the stator bus bar 91. As shown in FIG. 4, the terminals 91A constitute a corresponding u-phase stator 22A. One end of the coil is connected by a method such as welding. Although not shown in FIG. 3, terminals are provided so as to protrude from the outer periphery of the stator bus bar 92 and the stator bus bar 93, and one end of the coil constituting the corresponding v-phase stator 22B and the corresponding u-phase are provided. Each of the coils constituting the stator 22C is connected to one end of the coil by a method such as welding. Further, as shown in FIG. 4, a common bus bar 94 is provided which is formed in an annular shape like the stator bus bars 91, 92, 93 and arranged coaxially so as not to be in electrical contact with each other. Terminals (not shown) are provided so as to protrude from the outer periphery of the coils, and are connected to the other ends of the coils constituting all the stators 22 by a method such as welding.

  The housing 3 has a cylindrical shape that houses a part of the steering shaft 1 and the motor unit 2 and is made of a metal such as aluminum or stainless steel.

  As shown in FIGS. 3 to 6, the drive device for the electric power steering according to the present invention includes a metal plate 4 that has a plurality of through holes 41 and is formed so that the steering shaft 1 is inserted inside. ing.

  The metal plate 4 is made of a metal such as aluminum and has a thickness of, for example, about 4.5 to 5.5 mm, preferably 4.9 to 5.1 mm. The outer shape of the main surface of the metal plate 4 is larger than the inner diameter of the portion of the housing 3 where the first housing 3A and the second housing 3B are connected, and is connected in the vicinity of the motor unit 2. It is sandwiched between the first housing 3A and the second housing 3B. With this configuration, the heat generated in the switching element 51 is transmitted through the metal plate 4 to the first housing 3A and the second housing 3B sandwiching the metal plate 4, and is released to the outside. Therefore, it is possible to suppress the temperature of the switching element 51 from increasing. Further, if the size of the metal plate 4 is made larger than that of the housing 3 and the main surface of the metal plate 4 is exposed to the outside of the housing 3 to dissipate heat, the efficiency of waste heat is further increased. In that case, it is preferable to increase the area by attaching fins or the like to the main surface exposed to the outside.

  In the drawing, the first housing 3A and the second housing 3B have the same diameter, but the diameters may be different. In that case, the metal plate 4 being larger than the inner diameter of the housing 3 means that the inner diameter of the first housing 3A and the second housing 3B at the portion where the first housing 3A and the second housing 3B are connected. It is larger than the smaller one. In that case, when there is also a difference in the outer diameters of the first housing 3A and the second housing 3B, a part of the main surface of the metal plate 4 is exposed to the outside to absorb the difference in outer shape. Good.

It is preferable that the ratio of the portion where the metal plate 4 is sandwiched between the first housing 3A and the second housing 3B in the outer periphery of the metal plate 4 is high because the waste heat efficiency becomes high. The angle of the portion sandwiched between the first housing 3A and the second housing 3B as viewed from the steering shaft 1 is preferably 270 degrees (3/4 round) or more. It is particularly preferable that the entire outer periphery is sandwiched, and as shown in FIG. 3, it is preferable that only the center has a shape that is hollowed out so that the steering shaft 1 can be inserted. However, as shown in FIG. 9, which will be described later, a part of the disk may be cut out in correspondence with the connector portion 31 serving as an entrance for the power supply wiring and the ground wiring supplied from the external control unit. . Further, as shown in FIG. 12, a hole other than the passage through which the steering shaft 1 passes may be formed so that an electric wiring or the like passes.

  Further, as shown in FIG. 5, a plurality of wiring boards 5 on which switching elements 51 are mounted are provided on the main surface of the metal plate 4. Thereby, heat is transmitted from the switching element 51 to the metal plate 4. If the switching element 51 is provided on the main surface opposite to the side facing the stator 22, the fluctuation of the electromagnetic field generated by the motor unit 2 is reduced by the metal plate 4, so that the operation of the switching element 51 is stabilized. .

  In addition, a recess is provided in at least one of the surfaces where the first housing 3A and the metal plate 4 are connected so that entry of moisture and foreign matter from the outside of the housing 3 can be suppressed, and rubber or resin O is provided in the recess. You may make it insert a ring. The same is true between the second housing 3B and the metal plate 4.

  Further, as shown in FIG. 6, the metal bodies 61, 62, 63 (the metal bodies 61, 62 are the second ones) are inserted into the plurality of through holes 41 formed in the metal plate 4. May be referred to as a metal body). The metal bodies 61, 62 and 63 are electrically connected to the wiring board 5 on which the switching element 51 is mounted. The metal bodies 61, 62, 63 are fixed to the metal plate 4, but are insulated. In FIG. 6, the metal bodies 61, 62, 63 are connected on the side opposite to the side facing the stator 22, but may be connected on the opposite side. The metal body 63 is electrically connected to the stator 22 on the side facing the stator 22.

  With such a configuration, the current supplied from the external control unit is supplied to the stator 22 through the switching element 51 and the metal body 63. When the metal plate 4 is assembled to the rotor 22, the stator bus bars 91, 92, 93 and the common bus bar 94 are connected to the rotor 22, and the metal plate 4 provided with the metal body 63 and the wiring board 5 is sequentially connected. And the whole can be easily integrated by fixing the metal body 63 to the metal plate 4. Actually, if the rotor 22 is first attached to the first housing, the operation is further facilitated.

  Furthermore, if the metal bodies 61, 62, 63 are bolts and the stator bus bars 91, 92, 93 and the metal plate 4 are fixed, the assembly becomes easier.

Further, as shown in FIG. 7, on the side of the metal plate 4 facing the stator 22 (the side closer to the stator 22 than the metal plate), the power bus bar 71 connected to the power supply wiring extending from the external controller. And a grounding bus bar 72 connected to a grounding wire extending from the external control unit is provided insulated from the metal plate 4. Then, as shown in FIG. 6, the power bus bar 71 is a side facing the stator 22 of the metal plate 4 by the second metal body 61 arranged so as to pass through the through hole 41 formed in the metal plate 4. It is electrically connected to the switching element 51 mounted on the wiring board 5 through a wiring conductor 53 formed on the wiring board 5 on the opposite side. The grounding bus bar 72 is connected to the wiring board 5 on the side opposite to the side facing the stator 22 of the metal plate 4 by the second metal body 62 arranged so as to pass through the through hole 41 formed in the metal plate 4. It is electrically connected to the mounted switching element 51 and electrically connected to the metal plate 4. Further, the switching element 51 has a through hole 41 formed in the metal plate 4.
Are electrically connected to the stator bus bars 91, 92, 93 on the side of the metal plate 4 facing the stator 22.

  The wiring substrate 5 is made of ceramics such as silicon nitride or aluminum nitride, and is fixed to the metal plate 4 with an adhesive. The wiring board 5 is also formed with a through-hole 41 through which the metal bodies 61, 62, 63 are inserted. Here, the metal bodies 61, 62, and 63 are formed in a bolt shape, and are electrically connected to the wiring provided on the wiring board 5 using, for example, a washer.

  The metal bodies 61 and 63 need to be insulated from the metal plate 4 in order to prevent short-circuiting due to vibrations of the vehicle body and the like, and are exposed to high-temperature heat. Between the bodies 61, 62, 63 and the through hole 41, an insulator 42 made of an insulating resin having a heat resistant temperature of 170 ° C. or higher, such as polyether ether ketone, is interposed. Therefore, the metal bodies 61, 62, and 63 are held in the through hole 41 through the insulator 42, so that even if vibration or the like occurs, the metal bodies 61, 62, and 63 do not come into contact with the metal plate 4 and are short-circuited. In addition, the housing 3 becomes hot due to heat generated by the switching element 51 and the like, but by using a resin having a heat-resistant temperature of 170 ° C. or more, the metal bodies 61, 62, 63 are made to remain insulated in the through hole 41. Can be held.

  The second metal body 61 and the power bus bar 71, the second metal body 62 and the ground bus bar 72, and the metal body 63 and the stator bus bars 91, 92, 93 are connected by the power bus bar 71 and the ground bus bar 71. This is screwing due to the thread formed on the bus bar 72 and the stator bus bars 91, 92, 93. In this way, after the stator bus bars 91, 92, 93 and the common bus bar 94 are attached to the stator 22, the metal plate provided with the wiring board 5 is placed, and the metal body 63 is inserted into the through hole 41 of the metal plate 4. Thus, it can be easily assembled by screwing to the stator bus bars 91, 92, 93. As another embodiment, the stator bus bars 91, 92, 93 and the metal body 63 are integrated in advance, and the end of the metal body 63 on the metal plate 4 side is formed with a thread. You may fix with a nut in the edge of the side.

  Further, as shown in FIG. 4, the stator bus bars 91, 92, 93, the common bus bar 94, the power bus bar 71 and the ground bus bar 72 are preferably embedded in the heat resistant resin 8. In FIG. 4, the stator bus bars 91, 92, 93, the common bus bar 94, the power bus bar 71, and the ground bus bar 72 embedded in the heat resistant resin 8 are indicated by dotted lines.

  In this example, as shown in FIG. 5, three wiring boards 5 are attached to the main surface opposite to the side facing the stator 22 of the metal plate 4, and two wiring boards 5 are attached to each wiring board 5. A total of six switching elements 51 are mounted, and two switching elements 51 are assigned to correspond to the u-phase, the v-phase, and the w-phase, respectively.

  As shown in FIG. 8, the switching element 51 is formed of a field effect transistor and is connected to the power supply bus bar 71, the ground bus bar 72, and the stator bus bars 91, 92, 93 in a combination of the two switching elements 51, A control signal is supplied. Here, this control signal is a signal generated in response to the rotation of the steering wheel detected by a torque sensor (not shown), and each switching element 51 is connected via the lead wire 9 shown in FIGS. Input to the gate.

Then, by supplying current to the desired stator 22 selected by the plurality of switching elements 51, the desired stator 22 is changed to the N pole or the S pole. Specifically, for example, when current is supplied from the stator bus bar 91 to one end of the coil constituting the u-phase stator 22A by the plurality of switching elements 51, the common bus bar is connected from the other end of the coil constituting the u-phase stator 22A. The current is supplied to the other end of the coil constituting the v-phase stator 22B via 94, and flows from one end of the coil constituting the v-phase stator 22B to the ground via the stator bus bar 92. At this time, if the u-phase stator 22A has an N pole, the v-phase stator 22B has an S pole. The stator 22 functions as a motor by switching between the N pole and the S pole so as to apply a rotational force to the rotor 21.

  According to the above configuration, an electric power steering drive device in which the switching element 51 is hardly affected by the magnetic field generated from the stator 22 can be obtained. Further, the drive device for the electric power steering according to the present invention can be easily manufactured.

  In the embodiment described so far, the stator bus bars 91, 92, 93 and the switching element 51 are connected via the metal body 63, but the present invention is not limited to this embodiment. For example, as shown in FIG. 9, by using the u-phase bus bar 73, the v-phase bus bar 74, and the w-phase bus bar 75, the end portions of the respective bus bars are integrated into one place, and then the stator bus bars 91, 92 are combined. , 93 may be connected.

  However, when connected to the stator bus bars 91, 92, 93 via the u-phase bus bar 73, the v-phase bus bar 74, and the w-phase bus bar 75, the u-phase bus bar 73, the v-phase bus bar 74, and The length of the w-phase bus bar 75 will be different, and the voltage drop between the wiring board 5 and each of the stator bus bars 91, 92, 93 may vary to cause unevenness in the rotation of the motor 2. FIG. As shown in FIG. 4 and FIG. 4, when the metal body 63 is directly connected to each stator bus bar 91, 92, 93, the distance between the wiring board 5 and each stator bus bar 91, 92, 93 is substantially the same. And the voltage drop can be substantially the same. Therefore, the rotation of the motor 2 can be made smooth, and unevenness in operation feeling when the handle is operated can be eliminated.

  FIG. 10 is an explanatory diagram of another embodiment of the drive device for the electric power steering according to the present invention. In FIG. 10, the housing 103 is formed by connecting a cylindrical first housing 103A and a cylindrical second housing 103B, and the metal plate 104 includes a first housing 103A and a second housing 103B. The metal plate 104 is not exposed to the outside of the housing 103, and is housed between the cutout portions 103A1 and 103B1 provided in the connected portions. With such a configuration, it becomes difficult for moisture and foreign matter to enter the housing 103 from the outside. In the figure, both the first housing 103A and the second housing 103B are provided with notches 103A1 and 103B1, respectively, but may be provided only in one of them.

  In FIG. 10, the wiring board 105 on which the switching element 151 is mounted is provided on the side facing the stator 22.

FIG. 11 is an explanatory diagram of still another embodiment of the drive device for the electric power steering according to the present invention. In FIG. 11, the housing 203 is formed by connecting a cylindrical first housing 203A and a cylindrical second housing 203B, and the metal plate 204 includes a first housing 203A and a second housing 203B. It is housed in a notch 203A1 provided in the connected portion, and is sandwiched between the first housing 203A and the second housing 203B. Furthermore, the notch 203B1 is provided in the second housing 203B, and a portion that is bent in the middle of the path from the metal plate 204 to the housing 203 through the first housing 203A and the second housing 203B. Is provided, it becomes more difficult for moisture and foreign matter to enter the housing 203 from the outside.

  10 and 11, a recess is provided in at least one of the surfaces where the first housing 103A, 203A and the second housing 203B, 203B metal plate 4 are connected, and rubber or If a resin O-ring is inserted, it is possible to further suppress the entry of moisture and foreign matter from the outside.

  FIG. 12 is a modification of the configuration shown in FIG. 9. In FIG. 9, the ground wiring uses a metal plate as a conductor. In FIG. 12, the ground bus bar 872 is insulated from the metal plate. Has been.

DESCRIPTION OF SYMBOLS 1 ... Steering shaft 10 ... Shaft 11 ... Rack gear 12 ... Screw shaft 2 ... Motor part 21 ... Rotor 22 ... Stator 22A ... u-phase stator 22B ... v-phase stator 22C... w-phase stator 91, 92, 93, 191, 192, 293, 391, 392, 393, ... stator bus bar 91A ... stator bus bar terminals 94, 194, 294, ... Common bus bars 3, 103, 203... Housing 3A, 103A, 203A... First housing 3B, 103B, 203B... Second housing 103A1, 103B1, 203A1. 131, 231... Connector portions 4, 104, 204, 804... Metal plates 41, 141, 241,. 2,142,242 ... insulator 5, 105, 205 ... wiring board 51,151,251 ... switching element 61,162,162 ... metal body (second metal member)
63, 163, 263 ... metal bodies 71, 171, 271 ... bus bars for power supply 72, 172, 272 ... bus bars for grounding 73, 873 ... bus bars for u phase 74, 873 ... v phase Bus bar 75, 874 ... w-phase bus bar 8, 108, 208 ... heat resistant resin 9, 109, 209 ... lead wire

Claims (4)

  A steering shaft, a motor unit that is attached to a part of the steering shaft and includes a rotor having a permanent magnet and a plurality of stators that are provided so as to surround the rotor, and a part of the steering shaft And an electric power steering drive device including a cylindrical housing that houses the motor unit, wherein the housing is configured by connecting a cylindrical first housing and a cylindrical second housing, A metal plate having a plurality of through holes and having an inner diameter through which the steering shaft is inserted is larger than the inner diameter of the housing. The first housing and the second housing are adjacent to the motor portion. And a plurality of wiring boards on which switching elements are mounted are formed on the metal plate. A metal body that is provided on the surface and is electrically connected to each of the plurality of wiring boards and electrically connected to the stator on the stator side is insulated from the metal plate in the through hole. An electric power steering drive device characterized by being fixed by   The first housing and the second housing are directly connected, and at least one of the first housing and the second housing in a portion where the first housing and the second housing are connected 2. The electric power steering according to claim 1, wherein a notch is provided in the metal plate, and an end of the metal plate is accommodated in the notch and is not exposed to the outside of the housing. Drive device.   The main surface of the metal plate on which the plurality of wiring boards are provided is a main surface opposite to the stator side of the metal plate, and the connection between the plurality of wiring boards and the metal body is The drive device for an electric power steering according to claim 1 or 2, wherein the drive is performed on a side opposite to the stator side of the metal plate.   4. The electric power steering drive according to claim 1, wherein an insulator made of an insulating resin is provided between the through hole of the metal plate and the metal body. 5. apparatus.

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