JP5712015B2 - Motor drive device - Google Patents

Description

  The present invention relates to a motor drive device that is mounted on, for example, a power steering device used in an automobile and serves to generate steering assist torque in the device.

  As a conventional motor drive device applied to a power steering device of an automobile, for example, a motor housing that houses a motor element and a substrate that is used for drive control of the motor as described in Patent Document 1 below are housed. It is known that the ECU housing is configured as a separate body, and these are joined by screws. However, in such a separate structure, a seal structure that suppresses contamination by foreign matter is provided at the joint, or the assembly is more than a predetermined amount. Since there are various technical problems such as the need to ensure high accuracy, it is desired to integrate them.

JP 2003-204654 A

  However, when the housings are integrated, it may be difficult to adjust the motor current sensor (calibration) and to inspect the motor and the control circuit.

  That is, when the housings are separate structures, the motor element and the control circuit are assembled in different housings, and an inspection instrument or the like is inserted between the motor coil and the control circuit before connecting them. In this case, the motor and control circuit can be inspected. However, when both the housings are integrated, the motor element and the control circuit are accommodated in one housing. Since it is difficult to connect the two later as in the above, it is necessary to connect the two when housing them in the housing (when assembling the motor drive device). There is a problem that it becomes difficult to interrupt the inspection instrument or the like.

  The present invention has been devised in view of such technical problems, and provides a motor drive device that can ensure workability of inspection and the like of the motor and the control circuit while integrating the housing (housing) of the motor and the control circuit. To do.

  The present invention is a motor drive device configured such that a motor element and a control circuit are accommodated in one housing, and in particular, a plurality of relay terminals are provided separately for both the motor coil side and the circuit side. The housing is provided with a coil side opening and a circuit side opening that open to each terminal connection on the motor coil side and the circuit side, and each relay terminal is connected to each other through the opening. The end portion is configured to be connected to the motor coil and the control circuit, respectively.

  At this time, it is desirable that the plurality of relay terminals are bound and held by a binding member made of an insulating material.

  Further, on the motor rotation axis direction coil side opening side of the motor housing portion, a rotation position sensor for detecting the rotation position of the rotor and a bearing housing portion for providing one end side of the motor rotation shaft to the bearing are provided, It is desirable that the motor rotation shaft is configured to be rotatably supported by a bearing held in the bearing housing portion.

  According to the present invention, since the relay terminal is configured separately for both the coil side and the circuit side, each opening portion is connected before the relay terminal is connected even after the motor element and the control circuit are accommodated in the housing. It becomes possible to connect a predetermined inspection instrument or the like to each terminal connection portion. Thereby, while adopting a structure in which the motor and the control circuit are accommodated in one housing, it is possible to ensure workability such as inspection of the both.

  At this time, by bundling and holding a plurality of relay terminals by a bundling member, there is no risk that handling of each of these terminals will be complicated when connecting the plurality of relay terminals, and the connection workability is improved. To be served.

  In addition, by arranging the relay terminal and the rotational position sensor on the same axial direction side in the motor housing portion, it is possible to efficiently perform electrical connection between them and further improve the assembling workability.

  Furthermore, at this time, the rotational position of the rotor can be detected on the side with higher axial accuracy by directly holding the bearing on the side where the rotational position sensor is disposed by the bearing housing provided in the housing. This is possible, and is also used to improve the detection accuracy.

1 is a longitudinal sectional view illustrating a configuration of a motor drive device according to a first embodiment of the present invention. It is a fragmentary sectional view showing the specific structure of the binding member shown in FIG. It is a longitudinal cross-sectional view corresponding to FIG. It is a longitudinal cross-sectional view equivalent to FIG. 1 showing the assembly work state of a relay terminal etc. after completion | finish of test | inspection etc. of a motor drive device. It is a fragmentary sectional view equivalent to Drawing 2 showing the composition of the motor drive concerning a 2nd embodiment of the present invention. It is the longitudinal cross-sectional view equivalent to FIG. 1 which showed the structure of the motor drive device which concerns on 3rd Embodiment of this invention. It is a figure which concerns on the same embodiment, Comprising: It is a principal figure showing the binding state of each terminal by a binding member. It is the longitudinal cross-sectional view equivalent to FIG. 1 which showed other embodiment of this invention.

  Hereinafter, each embodiment of the motor drive unit according to the present invention will be described in detail with reference to the drawings.

  1 to 4 show a first embodiment of the present invention. As shown in FIG. 1, the motor driving apparatus includes a motor element 21 and a control for driving and controlling the motor element 21 in a common housing 10. The circuit 31 is integrally accommodated, and the both 21 and 31 are electrically connected to each other via three relay terminals 41 u to 41 w provided separately from the both 21 and 31 in the housing 10. It is a connected configuration. The motor 20 is configured by housing the motor element 21 in the housing 10, and the electronic control unit (hereinafter abbreviated as “ECU”) 30 is configured by housing the control circuit 31 in the housing 10. It is configured.

  The housing 10 is integrally molded by aluminum die casting, and a substantially cylindrical motor housing portion 11 that houses the motor element 21 therein, and a Y axis positive direction side that is the radially outer side of the motor housing portion 11. A circuit housing portion 12 having a substantially rectangular tube shape that accommodates the control circuit 31, and the motor housing portion 11 and the circuit housing portion 12 are in the Y-axis that is the radial direction of the motor housing portion 11. They communicate with each other via a communication portion 13 formed so as to penetrate along the direction.

  The motor housing portion 11 is configured in a substantially bottomed cylindrical shape having an opening in the positive axial direction along the Z-axis direction, which is the motor rotation axis direction, and is a motor fitted to close the opening. A motor housing that forms the exterior of the motor 20 together with the cover 14 is configured. That is, one end side in the axial direction (Z-axis negative direction end side) of the motor element 21 is housed in the motor housing portion 11 from the motor element insertion port 11a which is the opening, and the other end side is on the inner periphery of the motor cover 14. It is to be accommodated. Further, a shaft insertion portion 15 through which a motor rotation shaft 24 to be described later is inserted is formed at the bottom center position of the motor housing portion 11, and the inner periphery of the shaft insertion portion 15 has a motor rotation shaft 24. A first bearing holding portion 15a is provided for holding a first bearing B1 used for a bearing on one end side (Z-axis negative direction end side).

  The motor cover 14 is formed by bending a thin metal plate into a substantially covered cylindrical shape, and a plurality of bolts (not shown) are attached to the opening end surface of the motor accommodating portion 11 via a flange portion 14a formed at the opening edge. ). Further, the canopy portion 14b of the motor cover 14 holds the second bearing B2 used for the bearing on the other end side of the motor rotating shaft 24 so as to face the first bearing holding portion 15a at a substantially central position thereof. For this purpose, a second bearing holding portion 14c is provided.

  On the other hand, the circuit housing portion 12 is configured in a substantially bottomed rectangular tube shape having an opening formed on the Y axis positive direction side which is the side of the housing 10, and the circuit cover 16 is fitted so as to close the opening portion. In addition, an ECU housing that forms the exterior of the ECU 30 is configured. That is, one side in the Y-axis width direction of the control circuit 31 is accommodated in the circuit accommodating portion 12 from the circuit insertion port 12a which is the opening, and the other side protruding from the opening of the circuit accommodating portion 12 is accommodated inside the circuit cover 16. It has come to be. And, it corresponds to the bottom portion of the circuit housing portion 12, and one end portion (Z-axis negative direction end portion) of the partition wall 17 that separates the motor housing portion 11 and the circuit housing portion 12 has both the housing portions 11, 12. The communicating portion 13 that communicates with each other is formed penetrating along the Y-axis direction.

  The motor element 21 is a component of a so-called three-phase alternating current surface magnet type synchronous motor, and is substantially cylindrical and fixed to the outer periphery of a motor rotating shaft 24 rotatably supported by the bearings B1 and B2. The rotor 22 and a substantially cylindrical stator 23 disposed in a non-contact state on the outer peripheral side of the rotor 22 through a minute radial gap.

  The rotor 22 mainly includes a rotor core 22a fixed to the outer periphery of the motor rotating shaft 24 and a plurality of magnets 22b bonded to the outer periphery of the rotor core 22a.

  The stator 23 has a stator core 23a on which a plurality of (three in this embodiment (u-phase, v-phase, w-phase)) stator coils 23u to 23w are mounted. Each coil-side terminal connection portion in which the respective end portions of the stator coils 23u to 23w that are press-fitted, fixed and connected to each other are constituted by conductive metal plates provided at one end (Z-axis negative direction end) of the stator 23 The control circuit 31 (control board 33 described later) is connected via the relay terminals 41u to 41w connected to and fixed to the coil side terminal connection portions 25u to 25w.

  The motor rotating shaft 24 is configured such that one end in the axial direction thereof faces the outside of the housing 10 through the shaft insertion portion 15, and one end of the motor rotating shaft 24 is connected to an external driven device via a predetermined shaft coupling (not shown). By being connected to (for example, a reducer), the driving torque of the motor 20 is transmitted to the driven device.

  A resolver 40 serving as a rotational position sensor for detecting the rotational position of the rotor 22 is disposed on the outer periphery on one end side of the motor rotating shaft 24. The resolver 40 is fixed to one end of the motor rotating shaft 24, and includes a resolver rotor 40a having a plurality of rotating magnetic poles corresponding to the number of pole pairs of the rotor 22, and an inner end portion (Z-axis positive direction end of the shaft insertion portion 15). Is held in a non-contact state via a minute radial gap on the outer peripheral side of the resolver rotor 40a, and a sensor coil 40c is wound around a plurality of magnetic poles. A plurality of (in this embodiment) the end portions of the sensor coil 40c mainly composed of the rotating resolver stator 40b and connected to each other are erected via a terminal block 43 adjacent to the sensor holding portion 15b. Are connected to the control circuit 31 via the six resolver output terminals 42. That is, the tip of the resolver output terminal 42 associated with each of the magnetic poles extending along the Y-axis direction faces the circuit housing portion 12 through the communication portion 13 and protrudes from the control circuit 31 (control board 33 described later). The resolver 40 and the control circuit 31 are electrically connected by welding or the like to each connection terminal 44 provided.

  The control circuit 31 is connected to a power system module 32 (hereinafter referred to as “power board”) that constitutes a power supply circuit for supplying power from a battery (not shown) to the motor 20, and is connected to the power board 32. And a control board 33 which is a printed circuit board used for driving control of the motor 20 by controlling the power board 32 via the FET 35, and the outside of the power board 32 (on the Y axis positive direction side). ), The power board 32 is housed in the circuit housing portion 12 and the control board 33 is housed in the circuit cover 16. Here, both the substrates 32 and 33 are formed wider than the axial length of the motor 20 and extend outward in the axial direction (Z-axis positive direction side) from the Z-axis positive direction end of the motor 20. Accordingly, the circuit accommodating portion 12 is also extended outward in the axial direction with respect to the positive end of the Z axis of the motor 20. Hereinafter, a portion of the housing 10 (circuit housing portion 12) that extends outward in the axial direction from the motor 20 is referred to as an “extension region EX”.

  The power board 32 includes a plurality of MOS-FETs (hereinafter simply referred to as “FETs”) 35 and electrolysis in which a bus bar 34 made of a plurality of metal plates bent into a predetermined shape is used to control the power board 32. It is configured by being connected to an aluminum capacitor 36, a coil 37, a relay 38, a connector 39 for connection to a battery (not shown), various external sensors, and the like.

  The FETs 35 are connected to the control board 33 together with the bus bars 34, and energize the power board 32 based on a control signal output from the control board 33. Furthermore, each FET 35 is arranged such that a part of the outer surface of each FET 35 abuts against the inner wall of the housing 10 via a heat-dissipating sheet (not shown), and the heat generated in each FET is absorbed by the housing 10. It has become so. That is, on one end side of the partition wall 17, a heat sink portion 18 formed thicker than other regions is configured, and the FET 35 is disposed in contact with the heat sink portion, whereby the FET 35 This heat is transmitted to the heat sink part 18 and is dissipated from the heat sink part 18 to the outside through the entire housing 10.

  Here, one end side of the partition wall 17 is formed to be relatively thick with respect to other regions, and is configured as a heat sink portion 18 that absorbs heat generated in each FET 35.

  The connector 39 is configured in a substantially linear shape, and has a hole in a connector insertion hole 19 formed so as to penetrate along the Y-axis direction in the extension region EX of the circuit accommodating portion 12 corresponding to the other end portion of the partition wall 17. A connector connecting portion 39a that is attached to the edge so as to be exposed to the outside of the housing 10 and serves to connect to a mating connector (not shown) related to the wiring drawn from the battery, the sensor, etc., and the connector connecting portion 39a A plurality of PCBs that are extended from the base end portion of the circuit board through the connector insertion hole 19 into the circuit housing portion 12 and are connected to the bus bars 34 and connected to the control board 33. Terminal (not shown).

  As shown in FIGS. 1 and 2, each of the relay terminals 41u to 41w is provided at one end of the motor 20 side (stator coils 23u to 23w side) to each of the coil side terminal connection portions 25u to 25w. The coil-side terminal connection portions 25u to 25w are fixed to the coil-side terminal connection portions 25u to 25w by bolts 45 screwed into the female screw holes (not shown), and the other end portion on the ECU 30 side is attached to the control board 33 together with the FETs 35. Each of the stator coils 23u to 23w and the control board 33 are electrically connected to each other by welding or the like to a part of the bus bars (hereinafter referred to as “circuit side terminal connection portions”) 46u to 46w. Yes. Here, each of the circuit side terminal connection portions 46u to 46w is bent in a substantially U shape, and one end thereof is joined to the other end of each of the relay terminals 41u to 41w, while the other end is By connecting to the control board 33 together with the lead terminal 35 a of each FET 35, the relay terminals 41 u to 41 w are connected to the control board 33.

  Here, the connection between one end of each of the relay terminals 41u to 41w and each of the coil side terminal connection portions 25u to 25w is the bottom of the motor accommodating portion 11 and is opposed to each of the coil side terminal connection portions 25u to 25w. Each of the operation windows 48u to 48w (corresponding to the coil side opening according to the present invention) is formed through each of the positions and sealed by the respective sealing plugs 47 in the figure. That is, by tightening each bolt 45 with a tool such as a hexagon wrench inserted through each working window 48u to 48w, one end of each relay terminal 41u to 41w is connected to each coil side terminal connection portion 25u to 25w. The connection will be fixed. And the coil side connection means which concerns on this invention is comprised by this bolt fastening.

  On the other hand, the connection between the other end portions of the relay terminals 41u to 41w and the circuit side terminal connection portions 46u to 46w is made through the circuit insertion port 12a and is inserted from the circuit insertion port 12a. The other end portions of the relay terminals 41u to 41w are connected and fixed to the circuit side terminal connection portions 46u to 46w via welding rods or the like. And the circuit side connection means which concerns on this invention is comprised by this welding etc.

  Each of the relay terminals 41u to 41w is bound in the circuit housing portion 12 via a binding member 50 fixed to the housing 10. As shown in FIGS. 1 and 2, the binding member 50 is integrally formed of an insulating material (for example, a resin material) and extends along the short side direction (X-axis direction in FIG. 2) of the circuit housing portion 12. And is formed in a thin shape in the peripheral area on one end side (Z-axis positive direction end side) in the short side direction, and the peripheral area on the circuit housing part 12 side of the communication part 13 (heat sink) In a state where the seat fixing part 51 seated and fixed to the part 18) and the other end side in the short side direction are formed in a thick shape, and the relay terminals 41u to 41w are respectively inserted to bind them together. And a bundling holding portion 52 that holds them integrally. The bundling member 50 thus configured has both ends in the longitudinal direction in a state in which the seating fixing portion 51 is seated on the circumference of the communication portion 13 and the bunch holding portion 52 is inserted into the communication portion 13. Each of the screws 54 inserted through a pair of screw insertion holes 53 formed through the portion is fixed to the housing 10 (heat sink portion 18) via each female screw portion 18a provided at both ends in the longitudinal direction of the communication portion 13. ing.

  Hereinafter, the characteristic operation and effect of the motor drive device will be described in detail while explaining the assembly procedure of the motor drive device according to the present embodiment based on FIG. 1, FIG. 3 and FIG.

  First, as shown in FIG. 3, after the resolver stator 40b having the first bearing B1 and the sensor coil 40c mounted thereon is assembled into the motor housing 11 from the motor element insertion port 11a, the resolver rotor 40a is disposed on the outer periphery thereof. One end of the motor rotating shaft 24 into which the rotor 22 is press-fitted is inserted into and fixed to the housing 10. Thereafter, the assembly on the motor 20 side is completed by assembling the motor cover assembly in which the stator core 23a to which the stator coils 23u to 23w are mounted and the second bearing B2 are assembled to the motor cover 14 to the housing 10.

  Subsequently, a board assembly (control circuit 31) formed by assembling the power board 32 and the control board 33 is assembled into the circuit housing portion 12 from the circuit insertion port 12a, and then the motor housing portion 11 side through the communication portion 13. The tip of each resolver output terminal 42 extending from the terminal is welded to each connection terminal 44, and the resolver 40 and the control board 33 are electrically connected. Thereafter, the terminals 39b and the like of the connector 39 are inserted into the circuit housing portion 12 through the connector insertion holes 19, and the terminals 39b and the like are welded from the circuit insertion port 12a side to thereby cause the bus bar 34 and the control board. Assembling on the ECU 30 side is also completed by electrically connecting to the connector 33 and fixing the connector connecting portion 39a to the housing 10.

  Next, in a state where the motor 20 and the ECU 30 are configured independently of each other, a predetermined probe 60 is interrupted between the motors 20 and 30, thereby calibrating a current sensor (not shown) related to the motor 20. Perform predetermined inspections. Specifically, one end side of the probe 60 is connected to the coil side terminal connection portions 25u to 25w via the work windows 48u to 48w, and the other end side is connected to the coil insertion port 12a. By connecting to the corresponding circuit-side terminal connection portions 46u to 46w, the predetermined inspection or the like is performed by bypassing the both 20 and 30.

  Then, after passing the predetermined inspection or the like, as shown in FIG. 4, first, the binding member 50 in which the relay terminals 41u to 41w are bound and held is inserted from the circuit insertion port 12a and each screw 54 is inserted. To the housing 10. After that, by inserting each bolt 45 through each of the working windows 48u to 48w, one end of each of the relay terminals 41u to 41w bound and held by the binding member 50 by each bolt 45 is connected to each coil side terminal. The connection terminals 25u to 25w are connected and fixed, and the other end portions of the relay terminals 41u to 41w are connected and fixed to the circuit side terminal connection parts 46u to 46w, respectively, by welding rods inserted through the circuit insertion port 12a. The motor 20 (stator coils 23u to 23w) and the ECU 30 (power board 32) are electrically connected.

  Here, when performing the connection work, each of the relay terminals 41u to 41w is positioned and fixed to the housing 10 by the binding member 50, so that one end side is passed through the work windows 48u to 48w. By simply inserting each bolt 45, and by only inserting a welding rod or the like from the circuit insertion port 12a at the other end side, the connection to each of the terminal connection portions 24u24, 46u to 46w can be performed easily and appropriately. This can improve the connection workability.

  That is, since the relay terminals 41u to 41w are integrally bundled using the binding member 50, the relay terminals 41u to 41w are not scattered during the connection work, and the connection work is complicated. Therefore, it is possible to minimize deterioration of the device assembly due to the provision of the relay terminals 41u to 41w. In addition, since the bundling member 50 is configured to be fixed to the housing 10, the trouble of performing the connection work while adjusting the position of each of the relay terminals 41u to 41w in the connection work is also eliminated. Thus, it is possible to more effectively suppress the deterioration of the device assemblability due to the provision of the relay terminals 41u to 41w.

  Further, when the stator coils 23u to 23w are connected, the coil side terminal connection portions 25u to 25w are arranged on the outer end portions of the stator coils 23u to 23w on the side accommodated in the motor accommodating portion 11. The stator coil 23u-23w side fixing which becomes one end part of each said relay terminal 41u-41w is screwed along the axial direction of the motor rotating shaft 24 with respect to each said coil side terminal connection part 25u-25w, respectively. Since the bolt is fastened, the insertion direction of the bolt 45 substantially coincides with the motor rotation axis direction, so that the bolt fastening work can be easily performed, which contributes to further improvement of the connection workability. it can.

  Finally, the sealing plugs 47 and the circuit cover 16 are assembled to the housing 10, the work windows 48 u to 48 w are sealed with the sealing plugs 47, and the circuit insertion port 12 a is closed with the circuit cover 16. Assembling of the motor driving device is completed.

  As described above, each of the working windows 48u to 48w and the circuit insertion port 12a used for the connection work are finally closed by the sealing plugs and the circuit cover 16, respectively. It is possible to suppress a problem that foreign matter is mixed into the housing 10 through the work windows 48u to 48w and the circuit insertion port 12a. Specifically, for example, when connecting a speed reducer to one end side of the motor rotating shaft 24 (the working windows 48u to 48w side), the working windows 48u to 48w are closed by the sealing plugs 47, Foreign matter mixing into the housing 10 from the reduction gear side through the work windows 48u to 48w will be suppressed.

  As described above, according to the motor drive device of the present embodiment, the relay terminals 41u to 41w are configured separately for both the motor 20 side and the ECU 30 side (hereinafter, this configuration is referred to as “relay terminal”). Therefore, even after the motor element 21 and the control circuit 31 are housed in the housing 10 as described above, the probe 60 is inserted through each of the working windows 48u to 48w and the circuit insertion port 12a. By this, the motor 20 and the ECU 30 can be bypassed, and the predetermined inspection or the like can be performed. Thereby, while adopting a structure in which the motor element 21 and the control circuit 31 are accommodated in one housing 10, workability such as inspection of the both 21 and 31 can be ensured.

  In addition, as described above, since the motor element 21 and the control circuit 31 are accommodated in the housing 10 and are connected to each other by the relay terminals 41u to 41w, the motor element insertion port 11a is connected to the motor element 21 and the control circuit 31. On the other hand, it is possible to employ a configuration in which the connector 39 overlaps the motor 20 so as to be orthogonal to the motor 20 in the opening-side axial direction of the insertion port 11a, which is used to suppress an increase in size in both the axial and radial directions of the apparatus. In addition, since the connector 39 is provided in the extension area EX of the housing 10, the axial range in the vicinity of the opening of the motor element insertion port 11a, which is a so-called dead space, is effectively used, and the apparatus is configured most compactly. can do.

  In other words, conventionally, in order to accommodate the motor element and the control circuit in one housing, it is necessary to accommodate the motor element and the control circuit in a state where both of them including the connector are connected. Although it is difficult to adopt the configuration in which the connector 39 overlaps in the axial direction on the opening side of the motor element insertion port 11a, the use of the separate relay terminal structure allows the motor element 21 to Since the connector 39 can be assembled after the assembly, the layout as in the present embodiment can be adopted.

  Further, in adopting the separate relay terminal structure as described above, since each of the relay terminals 41u to 41w is integrally bound by the binding member 50, the connection operation of the relay terminals 41u to 41w is performed. In addition, the relay terminals 41u to 41w are not separated, and there is no possibility that the connection work becomes complicated. Thereby, the connection workability of the relay terminals 41u to 41w can be improved. In other words, the assembly work burden due to the provision of the relay terminals 41u to 41w can be minimized.

  In addition, since the binding member 50 is fixed to the housing 10, the connection work is performed while adjusting the positions of the relay terminals 41u to 41w in the connection work of the relay terminals 41u to 41w. It is also possible to eliminate the complexity of the above, and it is possible to more effectively suppress the assembly work burden due to the provision of the relay terminals 41u to 41w.

  In the case of the present embodiment, each of the relay terminals 41u to 41w and the resolver 40 are disposed on the same axial direction side (one end side of the motor rotating shaft 24) in the motor accommodating portion 11, so It becomes possible to efficiently perform connection work to the circuit side terminal connection portions 46u to 46w and the connection terminals 44 related to the relay terminals 41u to 41w and the resolver output terminals 42. Further improvement can be achieved.

  Further, at this time, the resolver 40 and a bearing (first bearing) B1 on the side where the resolver 40 is disposed are a sensor holding portion 15b provided integrally with the housing 10 and a first provided adjacent thereto. Since it is configured to be directly held by the bearing holding portions 15a, it becomes possible to detect the rotational position of the rotor 22 on the side with higher axial accuracy, and also to improve the detection accuracy. .

  FIG. 5 shows a second embodiment of the motor drive device according to the present invention. The fixing means for the bundling member 50 is fixed to the housing 10 with a so-called snap-fit structure instead of screwing as described above. It is comprised as follows.

  That is, in the present embodiment, a pair of locking and fixing portions 55 and 55 that can be tilted in the X-axis direction are provided at both ends in the longitudinal direction of the binding member 50, and both the locking and fixing portions 55 and 55 are connected to each other. Via the opening inner edge 13a provided at both ends of the communication portion 13 in the longitudinal direction. More specifically, the locking and fixing portions 55 and 55 can be tilted in the X-axis direction using the base end portions 55a and 55a as fulcrums as the base end portions 55a and 55a are formed thin. The leg portions 55b and 55b extending from the respective base end portions 55a and 55a to the Z-axis negative direction side are formed on the basis of the elasticity of the base end portions 55a and 55. The binding members 50 communicate with each other when the substantially hook-like locking projections 55c and 55c provided so as to protrude elastically at the front end portion of the inner surface 13b are locked to the inner edge 13a of the opening. It is fixed to the part 13.

  In order to assemble the binding member 50 to the housing 10, the tapered tapered surfaces 55 d, 55 d formed on the outer portions of the respective locking projections 55 c, 55 c are opened outer edges at both ends in the longitudinal direction of the communication portion 13. When the bundling member 50 is pushed in the negative direction of the Z direction while being in contact with 13c, the locking fixing portions 55, 55 are brought into contact with the outer edge 13c of the opening based on the tapered surfaces 55d, 55d. It tilts inward so as to be pressed, and when the base ends of the respective locking projections 55c and 55c pass the inner edge 13a of the opening, they are released from the pressing force by the communicating portion 13, and the respective locking fixings When the portions 55 and 55 are restored outward, the locking protrusions 55c and 55c are locked to the opening inner edge 13a.

  Thus, according to the motor drive device according to the present embodiment, the bundling member 50 can be fixed to the housing 10 with one touch by the so-called snap-fit structure as described above, and the relay terminals 41u to 41w can be fixed. It is used for further improvement of connection workability (equipment workability of the device).

  6 and 7 show a third embodiment of the motor drive device according to the present invention. Not only the relay terminals 41u to 41w but also the resolver output terminals 42 are combined by the binding member 50. It is configured to bind.

  That is, in the present embodiment, the width in the Z-axis direction of the binding holding portion 52 of the binding member 50 is set to be wide, and the binding holding portion 52 is almost fitted to the communication portion 13 with this Z-axis direction width. The relay terminal holding parts 52u to 52w pass through the positions corresponding to the passage of the relay terminals 41u to 41w, and the sensor terminal holding parts 52a pass through the positions corresponding to the passage of the resolver output terminals 42, respectively. Thus, both the terminals 52u to 52w, 52a are integrally held together.

  Further, in adopting such a configuration, the connection form of each resolver output terminal 42 to the resolver 40 side also includes each terminal 42 bent substantially in an L shape as in each of the above embodiments, in the terminal block 43. It is desirable to connect to the sensor coil 40c via a connector 56 formed by bending each resolver output terminal 42 formed in a straight line into a substantially crank shape.

  As described above, according to the motor drive device according to the present embodiment, not only the relay terminals 41u to 41w but also the resolver output terminals 42 are bundled together by the binding member 50. Similarly to the relay terminals 41u to 41w, the resolver output terminals 42 are also provided for facilitating the connection work, and can contribute to further improvement in device assembly.

  Further, at this time, by adopting a configuration in which each resolver output terminal 42 is connected to the sensor coil 40c via the connector 39, the configuration in which each resolver output terminal 42 is bound by the binding member 50, that is, In adopting a configuration in which each resolver output terminal 42 is assembled later together with each of the relay terminals 41u to 41w after the motor element 21, the resolver 40 and the control circuit 31 are assembled, each of the resolver output terminals 42 is connected to the circuit insertion port 12a. These resolver output terminals 42 can be connected to the sensor coil 40c simply by inserting them from the Y axis negative direction side. This facilitates the connection work of each resolver output terminal 42 with the sensor coil 40c side. In other words, it is possible to reduce the work burden associated with adopting the structure in which the resolver output terminals 42 including the resolver output terminals 42 are bound by the binding member 50 as much as possible.

  The present invention is not limited to the configuration of each of the above-described embodiments. For example, the relay terminals 41u to 41w are separated from the motor element 21 and the control circuit 31 except for a specific configuration. The configuration and the like can be arbitrarily changed.

  For example, with respect to the connection form between each resolver output terminal 42 and the control board 33, each resolver output terminal 42 is indirectly connected to the control board 33 via each connection terminal 44 as in the above embodiments. In addition, as shown in FIG. 8, each resolver output terminal 42 may be directly connected to the control board 33 by extending the control board 33. In this case, since the number of parts for each connection terminal 44 can be reduced, the assembly workability of the apparatus can be further improved.

  Technical ideas other than those described in the scope of claims understood from each of the embodiments will be described below.

(A) In the motor drive device according to claim 2,
The motor drive device according to claim 1, wherein the bundling member has a fixing portion for fixing to the housing.

  By adopting such a configuration, it is possible to position each relay terminal by fixing the bundling member to the housing before connecting each relay terminal, and the connection work of these relay terminals can be facilitated. At this time, by using a so-called snap-fit structure for the fixing portion, it is possible to facilitate the fixing operation of the binding member and to reduce the number of parts related to the binding member.

(B) In the motor drive device according to claim 1,
The coil side terminal connection portion is provided on the axial end portion side of the coil,
The coil side connecting means is connected to a motor rotating shaft and is connected to the motor drive device.

  Thus, the connection work can be easily performed by adopting a configuration in which the connection work is performed in the axial direction with respect to the coil side terminal connection portion provided on the axial end portion side of the coil. For example, when the coil side connection means is fastened with screws, the fastening operation can be easily performed by making the longitudinal direction of the screws substantially coincide with the axial direction.

(C) In the motor drive device according to claim 1,
The motor accommodating portion is provided with a motor element insertion port for accommodating the motor element on the opposite side of the coil side opening in the motor rotation axis direction,
The circuit housing portion is formed to extend outward in the axial direction from the motor element insertion port in the motor rotation axis direction,
The housing is provided with a connector for connecting the wiring for supplying power from the battery and the control circuit,
The connector is formed on a surface that is axially outer than the motor element insertion port in the circuit housing portion and configured to be substantially parallel to the motor rotation shaft, and the motor element insertion port in the radial direction of the motor rotation shaft. A motor drive device characterized by being provided to overlap.

  Thus, by arranging the connector so as to protrude in the radial direction with respect to the motor rotation axis direction, the axial dimension of the apparatus can be reduced. At this time, by arranging the connector so as to overlap the motor element insertion port, it is possible to reduce the size of the apparatus in the radial direction.

(D) In the motor drive device according to claim 1,
The motor drive device according to claim 1, wherein a lid member that closes the coil side opening and the circuit side opening is provided.

  By adopting such a configuration, for example, even when a speed reducer is connected to the coil-side opening, the contamination from the housing from the speed reducer side can be suppressed.

DESCRIPTION OF SYMBOLS 10 ... Housing 11 ... Motor accommodating part 12 ... Circuit accommodating part 12a ... Circuit insertion port (circuit side opening part)
31 ... Control circuits 23u to 23w ... Stator coil (coil)
24 ... motor rotating shafts 25u to 25w ... coil side terminal connecting portions 41u to 41w ... relay terminal 45 ... bolts (coil side connecting means)
46u-46w ... Circuit side terminal connection part 48u-48w ... Work window (coil side opening part)

Claims (2)

A motor element comprising a rotor that rotates integrally with a motor rotation shaft, and a stator that is disposed on the outer peripheral side of the rotor and has a plurality of phase coils;
A control circuit for performing power supply and energization control to the coil;
A motor housing portion for housing the motor element; and a circuit housing portion disposed on a radially outer side of the motor housing portion for housing the control circuit, the inner spaces of the housing portions being configured to communicate with each other. Housing
A coil-side terminal connection provided in the motor housing and electrically connected to the coil;
A circuit-side terminal connecting portion provided in a circuit housing portion and electrically connected to a power supply circuit that supplies power to the coil in the control circuit;
A coil side opening formed in the housing so as to face the coil side terminal connection part to the outside;
A circuit side opening formed in the housing so as to face the circuit side terminal connection part to the outside;
A plurality of relay terminals for supplying power from the power supply circuit to the coil by electrically connecting the coil side terminal connection portion and the circuit side terminal connection portion;
Coil side connection means for connecting the coil side terminal connection part and one end side of the relay terminal;
Circuit side connection means for connecting the circuit side terminal connection portion and the other end side of the relay terminal ,
A rotation position sensor for detecting the rotation position of the rotor is disposed in the motor housing portion on the coil side opening side in the motor rotation axis direction, and
The motor driving device is characterized in that the motor rotating shaft is rotatably supported by a bearing that is housed and held in a bearing holding portion provided on the coil side opening in the motor rotating shaft direction of the motor housing portion. .   The motor driving apparatus according to claim 1, wherein the plurality of relay terminals are bound and held by a binding member made of an insulating material.

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