JP6280773B2 - Drive control device for electric actuator - Google Patents

Description

  The present invention relates to an improved technique of a drive control device for an electric actuator that operates a drive device such as an electric power steering device of a vehicle.

  For example, in an electric power steering device for a vehicle, as described in Patent Document 1 below, the rotational driving force of an electric motor, which is an electric actuator, is used to assist the steering operation by the driver. It is used.

  The drive control device for the electric motor smoothes a disk-shaped first substrate having a switching circuit that supplies a drive signal to the electric motor in a cylindrical unit cover, and a power supply voltage that is a source of the drive signal. A disk-shaped second substrate having an electrolytic capacitor and a disk-shaped third substrate having a control circuit for controlling the switching circuit are accommodated and held.

  The opening of the unit cover is closed by a motor cover that houses the electric motor, and the first substrate, the second substrate, and the third substrate are sequentially arranged in the axial direction of the motor shaft of the electric motor. .

JP 2013-106376 A

  However, in the prior art described in the publication, since the unit cover is formed in a cylindrical shape, the first to third substrates are also formed in a disc shape according to the cylindrical inner shape of the unit cover. The housing is arranged in a state of being superposed in series in the axial direction.

  For this reason, the size in the radial direction of the first to third substrates is inevitably restricted, and a sufficient surface area cannot be obtained. As a result, the number and size of electronic components on which the board is mounted may be limited.

  The present invention has been devised in view of the above-mentioned conventional technical problems, and is a drive control device for an electric actuator capable of increasing the surface area of a circuit board as much as possible while improving the mountability to a vehicle. The purpose is to provide.

The invention according to claim 1 of the present invention is, inter alia, a cylindrical housing, an electric motor having a drive unit housed in the housing, a circuit board for driving and controlling the drive unit, and a housing in which the circuit board is housed. A control unit having a casing,
The storage casing is formed in a rectangular box shape and provided in a state extending in the axial direction from the axial end of the housing, and the circuit board is provided with a width direction along the width direction of the storage casing. And the drive unit and the circuit board are electrically connected via connection terminals provided at the ends in the longitudinal direction of the circuit board.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to enlarge the mounting area of a circuit board, improving the mounting property to a vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a first embodiment in which a drive control device for an electric actuator according to the present invention is applied to a power steering device. It is a side view which shows the electric motor and control unit which are provided to this embodiment. It is a top view of the electric motor and a control unit. It is the exploded view which looked at the control unit provided to this embodiment from the side. It is a longitudinal cross-sectional view of the control unit. It is a top view which shows the state which removed the upper casing part of the control unit. It is a top view which shows the state which removed the upper casing part and control board of the control unit. It is a disassembled perspective view of the control unit. It is a perspective view which shows the connection location of the electric motor with which this embodiment is provided, and a control unit. It is a longitudinal cross-sectional view of the connection location of the same electric motor and control unit. It is a disassembled perspective view which expands and shows a part of the rear end side of the inverter board | substrate provided to this embodiment, and the front end side of a connector. It is a perspective view which expands and shows a part of the rear-end side of the inverter board | substrate provided to this embodiment, and the front-end side of a connector. It is an enlarged view which decomposes | disassembles and shows the connection location of the accommodation casing and connector which are provided to this embodiment. It is a schematic diagram which shows 2nd Embodiment of this invention.

Embodiments of a drive control apparatus for an electric actuator according to the present invention will be described below with reference to the drawings. In the present embodiment, the drive device is applied to an electric power steering device which is a vehicle steering device.
[First Embodiment]
As shown in FIG. 1, the electric power steering apparatus includes a ferrous metal gear case in which a rack gear 03 and a pinion gear 04 are accommodated inside a steering shaft 02 having a steering shaft 01 coupled to an upper end portion. 05 is provided. An electric motor 1 that is an electric actuator that assists the rotational force of the steering shaft 02 is provided on one side of the gear case 05 via a bracket (not shown). A control unit 2 for controlling the rotation of the electric motor 1 is attached to the rear end portion of the electric motor 1, and a connector 3 having both for energization and for communication is provided on the rear end side of the control unit 2. Is assembled.

  The electric motor 1 is a normal three-phase brushless AC motor, and is housed in a motor housing 4 and the motor housing 4 as shown in FIGS. 2, 3, 9, and 10. The rotational drive force of the drive unit 5 is transmitted to the pinion gear 06 via a reduction mechanism (not shown) housed in the motor housing 4, and this drive force is transmitted to the rack gear. 03 is given as assist power.

  The motor housing 4 is formed in a substantially cylindrical shape by a metal material, and four boss portions 4a to 4d are integrally formed on the outer periphery of one end portion, and are inserted into bolt insertion holes formed in the boss portions 4a to 4d. The drive shaft 6 of the speed reduction mechanism protruding from the front end opening is connected to the pinion gear 5 while being fixed to the gear case 05 by a bolt not shown.

  An annular sealing groove 4e is formed at the opening edge on the rear end side of the motor housing 4. The sealing groove 4e is formed in a substantially U shape in cross section, and the control unit 2 will be described later. The projecting portions 21 and 24 projecting from the front end portion of the housing casing 15 to be fitted are fitted, and a U-shaped groove seal is configured by pressing a sealant prefilled into the seal groove 3e. It has become.

The drive unit 5 includes a coil 7 fixed to the inner peripheral surface of the motor housing 4, a cylindrical permanent magnet 8 rotatably provided inside the coil 7, and a central axis direction of the permanent magnet 8. And a motor shaft 9 provided integrally.

  The motor shaft 9 has one end 9a extending from one end opening of the motor housing 4 toward the control unit 2 and the other end (not shown) is linked to the speed reduction mechanism via a gear.

  A switchboard 10 for supplying a control current to the coil 7 is fixed to the inner rear end side of the motor housing 4 with a plurality of screws 11. The distribution board 10 is molded with a wiring circuit 10a, and three motor terminals 12 (U-phase terminals), 13 (V-phase terminals), 14 (W-phase terminals) electrically connected to the wiring circuit 10a. ), And one end portion 9a of the motor shaft 9 is rotatably inserted through the central through hole.

  As shown in FIG. 9, each of the motor terminals 12 to 14 is formed in an elongated plate shape that extends in parallel along the axial direction of the motor shaft 9 and is electrically connected to the switchboard 10. Fixed end portions 12a to 14a, and bifurcated fork-like connecting portions 12b to 14b that protrude integrally from the front end edges of the fixed end portions 12a to 14a and have a central portion cut out in the longitudinal direction. Has been.

  The control unit 2 includes a housing casing 15 made of an aluminum alloy material, and a circuit board 16 (ECU) that is housed in the housing casing 15 and controls the drive unit 5.

  As shown in FIGS. 2 to 5, the receiving casing 15 is sufficiently close to the motor housing axis Y with the axis X bent at an angle α of about 30 ° with respect to the axis Y of the motor housing 4. It arrange | positions so that it may become a position along an axial direction. The angle α of the housing casing 15 with respect to the motor housing 4 can be set to an arbitrary angle position of 0 ° or more and 90 ° or less.

  The housing casing 15 is formed in a rectangular box shape that is long in the front-rear direction along the axial direction of the motor housing 4 and has a lateral width equal to or slightly shorter than the outer diameter of the motor housing 4. The lower casing portion 17 (first divided portion) and the upper casing portion 18 (second divided portion) are vertically divided into two.

  As shown in FIGS. 4, 6, and 7, the lower casing portion 17 is formed in a substantially rectangular shape in plan view that is long in the front-rear direction, and is formed in a substantially U-shaped cross section. A relatively thick bottom wall 17a, lower side walls 17b and 17b rising from both side portions of the bottom wall 17a, and a lower connecting portion 17c formed integrally at one end in the longitudinal direction. The other end side is formed with an opening into which the connector 3 is inserted.

  The bottom wall 17a has a female screw hole (not shown) into which the four screw portions 19 for fixing the circuit board 16 are screwed at the four corners, and functions as a heat sink for heat dissipation by being formed thick. It is supposed to be.

  The lower side walls 17b and 17b are formed thinner than the bottom wall 17a, and seal grooves 20 and 20 having a substantially U-shaped cross section are formed along the longitudinal direction at the respective upper ends. In addition, rectangular opening grooves 20a, 20a, 20b, and 20b communicating with the seal grooves 20 and 20 are formed in the front and rear end walls of the seal grooves 20 and 20 so as to penetrate in the front-rear direction.

  The connecting portion between the bottom wall 17a and both side walls 17b and 17b is formed in a circular arc shape in cross section.

  The lower connecting portion 17c rises in a bent shape at an angle of approximately 30 ° from the front end edge of the bottom wall 17a and the front end edges of the side walls 17b and 17b, and the whole is formed in the lower half of the rear end portion of the motor housing 4 It is formed in a semi-cylindrical shape along. A projecting portion 21 that fits into the seal groove 4e of the motor housing 4 is integrally formed at the center in the width direction of the front end surface of the lower connecting portion 17c. The projecting portion 21 is formed in an arc shape along the front end surface of the lower connecting portion 17c, and both end edges 21a and 21b extend to the same height as the bottom surface positions of the front end opening grooves 20a and 20a. ing.

  Further, as shown in FIG. 13, an arc-shaped projecting portion 22 is provided on the front end surface of the other end portion along the cross-sectional shape of the lower casing portion 17. 22 is formed with rectangular cutout grooves 22b and 22b facing the respective opening grooves 20b and 20b on the rear end side at both ends.

  As shown in FIGS. 4, 5, and 8, the upper casing portion 18 is provided in a fitted state from above the lower casing portion 17 and is formed in a substantially rectangular shape in plan view that is long in the front-rear direction. In addition, it is formed in a substantially U-shaped transverse cross section, and is integrated with a flat upper wall 18a, upper side walls 18b, 18b falling from both sides of the upper wall 18a, and one end in the longitudinal direction. The other end side is an opening to which the connector 3 is connected.

  The upper wall 18a is formed to have substantially the same thickness as the bottom wall 17a. The upper side walls 18b, 18b are formed with projecting portions 23, 23 fitted in the longitudinal direction at the lower ends of the upper side walls 18b, 18b, respectively, which fit into the seal grooves 20, 20 of the lower side walls 17b, 17b. The one end portions 23a and 23a and the other end portions 23b and 23b extend to the vicinity of the opening grooves 22a, 22a, 22b and 22b on the both end portions side of the lower casing portion 17.

  Each of the protrusions 23 and 23 is inserted into each of the seal grooves 20 and 20 while pushing the sealing agent previously filled in the lower seal grooves 20 and 20 into a groove seal having a long seal length. Is supposed to form.

  In addition, the sealant pushed into the seal grooves 20 and 20 by the protrusions 23 and 23 is partly the front and rear opening grooves 20a, 20a, 20b and 20b, and the front and rear notch grooves 22a, It leaks to 22a, 22b, 22b, and these parts are continuously sealed. The opening grooves 20a to 20b and the notch grooves 22a to 22b as a whole constitute a notch.

  The upper connecting portion 18c, like the lower connecting portion 17c, rises in a bent shape at an angle of about 30 ° from the front end edge of the upper wall 18a and the front end edges of both side walls 18b, 18b, and the whole motor housing 4 is formed in a semi-cylindrical shape along the upper half shape of the rear end portion. A projecting portion 24 that fits into the seal groove 4e of the motor housing 4 is integrally formed at the center in the width direction of the front end surface of the upper connecting portion 18c. The projecting portion 24 is formed in an arc shape along the front end surface of the upper connecting portion 18c, and when the both end edges 24a and 24b are assembled to the lower casing 17 from above, The both end edges 21a and 21b of the nine projecting portions 21 of the lower connecting portion 17c are in a state of being butted from above and below.

  Further, as shown in FIGS. 4 and 5, an arc-shaped projecting portion 25 is provided on the front end surface of the other end portion along the cross-sectional shape of the upper casing portion 18. Both end edges 25a and 25b of the shape portion 25 are also in a state of abutting against both end surfaces of the lower protrusion portions 22 and 22 from the vertical direction.

  As shown in FIGS. 5 to 8, the circuit board 16 includes an inverter board 26 that is a lower metal board disposed and fixed on the upper surface of the bottom wall 17 a of the lower casing portion 17, and an upper position of the inverter board 26. And an upper control board 27 disposed on the upper side.

  The inverter board 26 is formed in a substantially rectangular shape in accordance with the shape of the housing casing 15, the entire lower surface is in contact with the upper surface of the bottom wall 17 a, and the control board 27 is formed by the four screw portions 19. And screwed to the bottom wall 17a. In addition, a wiring circuit is molded with a resin material on the upper surface of the inverter board 26, and five aluminum electrolytic capacitors 28a to 28e and a U-phase upper arm as a plurality of MOS-FETs which are driving semiconductors for each layer. The MOS 29a, the V-phase upper arm MOS 29b, the W-phase upper arm MOS 29c, the U-phase lower arm MOS 30a, the V-phase lower arm MOS 30b, and the W-phase lower arm MOS 30c are mounted, and the UVW MOSs 29a to 29c and 30a to 30c are respectively mounted. Phase relays 31a to 31c are mounted. Further, electronic components such as a coil 32, power supply relays 33a and 33b, a power supply female terminal 34, and a GND female terminal 35 are mounted.

  As shown in FIGS. 5 and 12, the power supply female terminal 34 and the GND female terminal 35 are bent into a rectangular ring shape, and the opposing piece at the front end on the connector 3 side is folded inward. The power supply male terminal 55 and the GND male terminal 56 of the connector 3 which will be described later are press-fitted into and connected to a minute gap between the opposing bent portions.

  Further, as shown in FIG. 9, three motor connection terminals 36, 37, and 38 connected to the UVW phase motor terminals 12 to 14 are erected on the motor side front end portion of the inverter board 26. ing. The motor connection terminals 36 to 38 are provided in parallel to the equally spaced positions along the width direction of the inverter board 26, and the front end portions 36 a to 38 a penetrating the control board 27 from the up and down direction. The motor terminals 12 to 14 are bent in the direction of the connector 3 so as to be perpendicular to the extension line direction. The tip portions 36a to 38a are formed with a pair of connection holes 36b, 37b and 38b through which the bifurcated tip portions 12b to 14b of the motor terminals 12 to 14 are inserted.

  Note that a plurality of terminal groups 39 connected to the electronic components and the like are projected upward at a predetermined position of the inverter board 26.

  The control board 27 is formed in a rectangular shape that is substantially the same as the shape of the inverter board 26, and a frame-shaped aluminum alloy holding frame 40 is fixed to the outer periphery of the lower surface. The four cylindrical support portions 41 through which the screw portions 19 are inserted are arranged and fixed above the inverter board 26 with a predetermined gap. The control board 27 is resin-molded with a wiring circuit that is electrically connected to each electronic component or the like via the terminal group 39, and an electric motor as shown in FIGS. Opening windows 42a to 42c through which the front end portions 36a to 38a of the motor connection terminals 36 to 38 are inserted from below are formed at the front end portion on the one side.

  In addition, a block 43 having an inclined front surface 43a is fixed to the outer surface of the front end portion of the holding frame 40, and a sensor unit 44 for detecting the rotational speed of the motor shaft 9 is provided on the front surface 43a of the block 43. ing. The sensor unit 44 is disposed so as to be opposed to the front end surface of the front end portion 9 a of the motor shaft 0 by using the inclination of the front surface 43 a of the block 43.

  Further, the control board 27 has two sub-connectors 45 and 45 for communication fixed on the upper surface of the rear end portion, and the lower surface of the control board 27 has a female terminal for power supply 34 on the inverter board 26 and a female mold for GND. Two support blocks 46 and 46 that respectively support the rear end surfaces of the terminals 35 are fixed.

  The sub-connectors 45, 45 have a plurality of female terminals inside.

  Each of the support blocks 46, 46 fits the connector 3 to the rear end of the housing casing 15, and connects the power supply male terminal 55 and the GND male terminal 56 of the connector 3 to the power supply female terminal 34. Further, when press-fitting into a minute gap formed in the female terminal for GND 35, the rear end surfaces of the female terminal for power supply 34 and the female terminal for GND 35 are supported and peeled off from the upper surface of the inverter board 26, etc. It suppresses.

  The connector 3 is integrally formed of a synthetic resin material, and as shown in FIGS. 2 to 7, as shown in FIGS. 2 to 7, an exterior member 50 fitted into the rear end portion of the housing casing 15 from the longitudinal direction, and the rear of the exterior member 50 An elliptical cylindrical power connector portion 51 and two communication connector portions 52 and 53 integrally connected to the end portion are provided.

  The exterior member 50 includes an outer peripheral portion 50a and an end wall 50b separated from the outer peripheral portion 50a. The outer shape of the outer peripheral portion 50a is the same shape as the elliptical cross section of the rear end portion of the housing casing 15. The entire structure including the end wall 50b is formed in a cap shape. Further, the front end surface of the outer peripheral portion 50a has a U-shaped seal groove 54 fitted to the upper and lower protruding portions 22 and 25 provided on the rear end surface of the housing casing 15 over the entire circumference. Is formed. Securing the groove seal by pushing the seal agent prefilled into the seal groove 54 by the projecting portions 22 and 25 is the same as when obtaining a groove seal by connecting the motor housing 4 and the housing casing 15. It is.

  The power connector 51 protrudes from the outer surface of the end wall 50b, and a power male terminal 55 and a GND male terminal 56 are fixed in the inner axial direction. The male terminal 55 for power supply and the male terminal 56 for GND have one end portions 55a and 56a facing the inside of the connector portion 51, but the other end portions 55b and 56b bent in a crank shape It penetrates the end wall 50b and is press-fitted into a minute gap between the power supply female terminal 34 and the GND female terminal 35 of the inverter board 26.

  The communication connector parts 52 and 53 protrude from the outer surface of the end wall 50b, and a plurality of communication male terminals 57 and 58 are fixed in the inner axial direction. One end portions 57a and 58a face the inside of the connector portions 52 and 53, but the other end portions 57b and 58b penetrate the end wall 50b and are female in the sub-connectors 45 and 45 of the control board 27. Connected by pushing into the terminal.

Each of the connector portions 51 to 53 is connected to a female connector from the outside so that a current and a communication signal from a battery power source are input.
[Effects of this embodiment]
Hereinafter, the operation of the present embodiment will be described. The driver rotates the steering wheel 01 while driving the vehicle, drives the electric motor 1 to rotate through the control current from the control unit 2, and decelerates. A normal assist drive for steering operation is performed by the pinion gear 06 through a mechanism.

  And in this embodiment, since the said housing casing 15 was attached not to the side part of the motor housing 4, but to the rear end part side at the angle position of about 30 degrees, and was arrange | positioned along an axial direction, it is an apparatus. It is possible to sufficiently suppress the overall enlargement in the radial direction, that is, the device can be slimmed. As a result, the mountability of the drive control device in an engine room or the like is improved.

  In particular, since the control unit 1 can be arranged at an arbitrary angle α position of, for example, about 30 ° to less than 90 ° with respect to the axis Y of the motor housing 4, the degree of freedom of layout in the engine room is improved. Thus, interference with other parts in the engine room can be suppressed.

  Further, the angle of the housing casing 15 can be arbitrarily changed with respect to the motor casing 3 and can be arranged parallel to the axial direction of the rack gear 03 as shown in FIG. It becomes possible.

  Moreover, in the control unit 2, the housing casing 15 is formed in a flat rectangular thin box, and the inverter board 26 and the control board 27 housed in the housing casing 15 are also rectangular according to the shape of the housing casing 15. Can be formed. For this reason, the surface area on which the electronic component is mounted can be sufficiently increased with respect to a structure in which each substrate must be formed in a disk shape as in the prior art. As a result, it is not necessary to provide a large number of substrates as in the conventional case where the surface area is small, so that the manufacturing cost can be reduced.

  Further, since the bottom surface of the inverter board 26 on which many heat generating electronic components are mounted is in contact with the top surface of the thick bottom wall 17a of the lower casing portion 17, heat from the heat generating components is efficiently radiated. can do. As a result, the cooling effect of the circuit board 16 is increased.

  Furthermore, by thickening the bottom wall 17a, the inverter board 26 can be arranged at a position with a large width area in the central portion of the lower casing portion 17 in the vertical direction. That is, the lower casing 17 has an arcuate outer surface at the joint between the bottom wall 17a and both side walls 17b, 17b. Therefore, when the bottom wall 17a is formed thin, this inverter board 26 The width length must be reduced. However, since the thickness of the bottom wall 17a is large, the inverter board 26 can be arranged on the center side avoiding the arc portion, so that the width of the inverter board 26 can be made sufficiently large. Therefore, it is possible to increase the mounting area of the electronic component.

  Further, since the motor terminals 12 to 14 on the electric motor 1 side are inserted and connected to the motor connection terminals 36 to 38 on the control unit 2 side from the orthogonal direction, this insertion work is easy. At the same time, the insertion stress acts on the fixed end side of the motor connection terminals 36 to 38, not in the lateral direction, so that the fixed pressure side of the motor connection terminals 36 to 38 is not easily peeled off from the inverter board 26 by the insertion pressure. .

  Further, since the bending angle of the motor connection terminals 36 to 38 is the same as the mounting angle of the housing casing 15 with respect to the motor housing 4, the assembling workability of the housing casing 15 is improved.

  Further, when the connector 3 is assembled to the rear end portion of the housing casing 15, the tip end portions of the power supply and GND male terminals 55 and 56 are press-fitted into the power supply and GND female terminals 34 and 35. Since the pressure input is received by the support blocks 46 and 46, deformation of the power supply and GND female terminals 34 and 35, peeling from the inverter board 26, and the like can be suppressed by the pressure input.

  It is also possible to form a slight gap between the rear surfaces of the power supply and GND female terminals 34 and 35 and the opposed front surfaces of the support blocks 46 and 46. Even if the dimensional variation of the GND female terminals 34 and 35, thermal deformation, etc. occur, the gap absorbs them, so that the assembly of the inverter board 26 and the control board 27 to the lower casing part 17 is good. become.

  Since the lower surface of the control board 27 is held by the holding frame 40, warpage and deformation due to thermal expansion and reduction can be sufficiently suppressed, and durability can be improved.

  The sensor portion 44 is fixed to the inclined surface of the block 43 having the same angle as the inclination angle of the motor housing 4 and the housing casing 15 and is disposed to face the distal end surface of the distal end portion 9 a of the motor shaft 9. As a result, the rotation detection accuracy of the motor shaft 9 can be improved.

  Further, by providing the sensor portion 44 on the inclined surface of the block 43, the angle of the motor shaft 9 with respect to the component mounting surface of the circuit board 16 can be freely set. In other words. When the planar direction of the component mounting surface is 0 ° and the vertical direction is 90 °, the angle of the motor shaft 9 (motor housing 4) can be appropriately set in the range of 0 ° to 90 °. As a result, it is easy to lay out in a position avoiding other components in the engine room, and the mountability to the vehicle can be improved.

  Since each of the sub-connectors 45 and 45 is mounted on the upper surface of the control board 27 in advance, the sub-connector 3 is attached to the rear end portion of the housing casing 15 while the entire circuit board 16 is assembled to the control unit 2. Since the male male terminals 57 and 58 for communication can be connected to the connectors 45 and 45, the assembling workability is improved, and the product cost and the assembling man-hour can be reduced.

  Further, as described above, when the sealing agent previously filled in each sealing groove 20 is pushed from each projecting portion 23, the housing casing 15 leaks the sealing agent leaked from each opening groove 20a or each It enters the cutout groove 23 a and flows into the entire coupling surface of the lower casing portion 17 and the upper casing portion 18, the coupling end portion of the housing casing 15 and the motor casing 4, and the coupling end portion of the housing casing 15 and the exterior member 50. For this reason, it is possible to continuously seal all the joint portions.

  As a result, the sealing performance between the housing casing 15 and the motor housing 4 and the connector 3 is improved.

  Furthermore, since the motor connection terminals 36 to 38 provided on the inverter board 26 are arranged adjacent to each other along the width direction of the housing casing 15, the U-phase upper arm MOS 29a including the phase relays 31a to 31c. The energization lines from the V-phase upper arm MOS 29 b and the W-phase upper arm MOS 29 c to the motor connection terminals 36 to 38 are arranged in three rows toward the electric motor 1. This makes it possible to achieve equal length between phases and shorten the wiring distance. As a result, the wiring inductance can be reduced to reduce noise, and the drive efficiency of the electric motor 1 can be improved.

Further, by making the bottom wall 17a of the lower casing portion 17 thick, as described above, the heat acceptance amount of the heat transmitted from the inverter board 26 is increased, and the heat radiation efficiency can be improved.
[Second Embodiment]
FIG. 14 shows a second embodiment, in which the control unit 2 is arranged on the same axis as the axis Y of the electric motor 1, that is, the unit axis Y with respect to the motor axis X of both 1 and 2 is shown. The angle is set to 0 °.

  Therefore, since the control unit 2 is within the axial projection of the electric motor 1 and does not protrude in the radial direction, it is possible to further suppress interference with other components adjacent in the radial direction.

  In addition, since the other structure is the same as that of 1st Embodiment, the same effect is obtained.

  The present invention is not limited to the configuration of the above-described embodiment. For example, by arbitrarily setting the angle of the axis X of the control unit 2 with respect to the axis Y of the electric motor 1, according to the size and shape of the engine room. Since the layout can be changed, mounting on a vehicle is improved.

DESCRIPTION OF SYMBOLS 1 ... Electric motor 2 ... Control unit 3 ... Connector 4 ... Motor housing 5 ... Drive part 6 ... Drive shaft 9 ... Motor shaft 9a ... Tip part 10 ... Distribution board 12-14 ... UVW phase motor terminal 12a-14a ... Fixed end part 12b -14b ... bifurcated tip 15 ... housing casing 16 ... circuit board 17 ... lower casing part 17a ... bottom wall 18 ... upper casing part 20 ... seal groove 20a ... opening groove 21 ... projecting part 22 ... projecting part 22a ... Notch groove 23-25 ... Projection part 26 ... Inverter board 27 ... Control board 28a-30a ... Aluminum electrolytic capacitor 31 ... Relay 34/35 ... Female terminal for power supply, GND 36-38 ... Motor connection terminal 36a-38a ... Tip 40 ... Holding frame 43 ... Block 44 ... Sensor 50 ... Exterior member 51 ... Power connector 52/53 ... Communication connector Kuta part

Claims (11)

In a drive control device for an electric actuator that operates a drive device mounted on a vehicle,
An electric motor having a cylindrical housing and a drive unit housed in the housing;
A motor shaft provided at the center of the electric motor;
A control unit having a circuit board that drives and controls the drive unit, and a housing casing that houses the circuit board;
With
The housing casing is formed in a rectangular box shape, houses the circuit board therein, and is provided at an axial end of the housing in an inclined state with respect to the motor shaft ,
Drive control device of the electric actuator, wherein the circuit board and the driving unit via a connection terminal provided on the longitudinal end portion of the circuit board are electrically connected. In the drive control apparatus of the electric actuator according to claim 1,
The drive control device for an electric actuator, wherein the housing casing attached to the axial end of the housing is attached to a position within an angle range of 0 ° to 90 ° with respect to the axis of the housing. In the drive control apparatus of the electric actuator according to claim 1,
The drive device is a power steering device that applies a steering force to a rack gear that steers wheels,
The power steering device has a pinion gear that transmits the rotational torque of the drive unit to the rack gear,
The drive control apparatus for an electric actuator, wherein the control unit is disposed along the axial direction of the rack gear via the electric motor. In the drive control apparatus of the electric actuator according to claim 1,
The housing casing of the control unit is formed in two parts in a lower casing part and an upper casing part ,
A drive control device for an electric actuator, characterized in that a bottom wall of the lower casing portion made of a metal material is formed thick, and the circuit board is brought into contact with an inner bottom surface of the bottom wall. In the drive control apparatus of the electric actuator according to claim 1,
The circuit board has a connection terminal rising from a mounting surface on which an electronic component is mounted, and a drive terminal protruding from the drive unit side is connected to a front end portion of the connection terminal from a predetermined angle direction. A drive control device for an electric actuator. In the drive control apparatus of the electric actuator according to claim 5,
A connecting portion to which the drive terminal is connected is formed at a tip portion of the connecting terminal, and a predetermined angle corresponding to an attachment angle of the housing casing with respect to the housing with respect to an angle at which the connecting portion rises vertically from the circuit board. Bend at an angle,
The drive control device for an electric actuator, wherein the drive terminal is connected from a direction substantially perpendicular to the connection portion. In the drive control apparatus of the electric actuator according to claim 1,
While providing a power supply terminal for power supply or grounding at a position opposite to the connection terminal connected to the drive unit side of the circuit board,
The control unit has a connector terminal electrically connected to the power supply terminal,
A drive control device for an electric actuator, wherein a support portion for supporting a rear end surface of the power supply terminal is provided in a direction orthogonal to a connection direction of the connector terminal and the power supply terminal. In the drive control device of the electric actuator according to claim 4,
The circuit board includes an inverter board on which an electronic component and an inverter circuit for driving the driving unit are mounted, and a control board that generates a control signal for the inverter circuit.
The inverter board is fixed in the housing casing while being in contact with the bottom wall of the lower casing portion , and the control board is disposed on the electronic component mounting surface side of the inverter board,
The drive control apparatus for an electric actuator, wherein the control board is fixed to a holding frame and fixed in the housing casing. In the drive control apparatus of the electric actuator according to claim 8,
The control board includes a block having an inclined surface in which a wiring circuit is molded and a part thereof is inclined,
A drive unit for an electric actuator, wherein a sensor unit for detecting an operating state of the drive unit is provided on an inclined surface of the block, and a tip end surface of a rotation shaft of the drive unit is disposed facing the sensor unit. Control device. In the drive control apparatus of the electric actuator according to claim 1,
The control unit includes, at a position opposite to the connection terminal, an exterior member including a second connector that is connected to an external device and performs communication, and a sub-connector provided at an end of the circuit board. ,
A drive control device for an electric actuator, wherein the second connector and the sub-connector are electrically connected when the exterior member is coupled to the housing casing. In the drive control device of the electric actuator according to claim 10,
The housing casing is divided into two in the radial direction, and two first seal grooves filled with a sealant are formed on the upper surfaces of both side walls extending in the drive unit direction of one of the divided portions. In addition, a coupling portion to which the housing or the exterior member is coupled is provided on an end portion side in the longitudinal direction of each first seal groove, and a notch portion is provided between the coupling portion and the end portion of each first seal groove. A drive control device for an electric actuator, comprising:

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