JP2012200070A - Driving control device of electric actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently reduce a height of a driving control device in a vertical direction to miniaturize the whole device and improve a degree of freedom of layout.SOLUTION: In a driving control device driving and controlling an electric motor of an electric power steering device, a power electronic circuit supplying a power to the electric motor and a filter electronic circuit removing an electromagnetic noise at energization are formed integrally to a bus bar assembly 13 molded from a resin material, and a control substrate 14 configuring a control circuit controlling to drive the electric motor is polymerized and arranged to the bus bar assembly. Six semiconductor switch elements 21 arranged to a lower surface of the bus bar assembly are held in a holding state between the bus bar assembly and a swollen part 5 of a plate-like housing main body 3 that is a heat radiation member via two heat radiation sheets 9.

Description

  The present invention relates to a drive control device for driving and controlling an electric motor used in, for example, an electric power steering device.

  As one of conventional drive control devices for an electric actuator mounted on a vehicle, a device described in Patent Document 1 below is provided.

  This prior art is a drive control device that controls the drive of an electric motor used in an electric power steering device, and this drive control device is housed between a housing body and a cover member, and includes a semiconductor switch element and a capacitor. And the like, a control board on which the microcomputer and the drive circuit are mounted, and a large current board on which a coil, a motor relay, and the like are mounted.

  A power connector, a signal connector, and a sensor connector are provided outside the housing, and a motor terminal protrudes from the housing through a through hole provided in the sensor connector.

  These configurations eliminate the need for external wiring, thereby reducing cost and weight.

JP-A-2005-304203

  However, the conventional drive control device is provided with the metal substrate separately from the control substrate and the large current substrate, and the metal substrate must be arranged in a superposed state with respect to the control substrate and the large current substrate. The size of the drive control device in the vertical direction is inevitably increased, and the drive control device cannot be sufficiently reduced in size and weight.

  The present invention has been devised in view of the technical problems of the conventional drive control device, and provides a drive control device capable of reducing the overall height of the device by reducing the vertical height of the device. The purpose is that.

  The present invention includes a power electronic circuit that supplies electric power to the electric actuator, a filter electronic circuit that removes electromagnetic noise during energization, and a control circuit that controls driving of the electric actuator, and the power electronic circuit and the filter electronic The circuit is integrally formed on a bus bar assembly molded with a resin material, and a control board constituting the control circuit is superposed on the bus bar assembly.

  According to the present invention, since the power electronic circuit and the filter electronic circuit are integrally formed in the bus bar assembly, the overall size of the apparatus can be reduced.

It is a disassembled perspective view which shows one Embodiment of the drive control apparatus which concerns on this invention. It is the perspective view which looked at the bus-bar assembly provided to this embodiment from the bottom face side before a semiconductor switch element etc. are attached. It is the perspective view seen from the bottom face side of the bus-bar assembly. It is a top view which shows the power distribution pattern inside the same bus-bar assembly. It is a top view which shows the state which assembled | attached the bus-bar assembly to the housing main body with which this embodiment is provided. It is an expanded sectional view showing a part of the bus bar assembly. It is a perspective view which shows the state which assembled | attached the control board to the same bus-bar assembly. It is a perspective view which shows the state which assembled the drive control apparatus of this embodiment.

  Hereinafter, an embodiment in which a drive control device for an electric actuator according to the present invention is applied to an electric power steering device for an automobile will be described in detail with reference to the drawings.

  First, the electric power steering device is provided at an upper end portion of an electric motor and a speed reduction mechanism (not shown) which are electric actuators that output an auxiliary torque to a steering wheel of a vehicle, and a motor casing of the electric motor. A drive control device for controlling the drive of the motor, a battery (not shown) for supplying a current for driving the electric motor, a torque sensor (not shown) for detecting the steering torque of the steering wheel, and the like are provided.

  The electric motor is a three-phase AC brushless motor, and has an armature winding and a rotational position detection sensor that detects the rotational position of the rotor.

  As shown in FIG. 1, the drive control device includes a housing 1 that is placed and fixed so as to close the upper end opening of the motor casing, and an electronic control component 2 that is held by the housing 1. .

  As shown in FIG. 1, the housing 1 includes a housing main body 3 that is a heat radiating member, and a cover member 4 that fits the electronic control component 2 assembled to the upper end of the housing main body 3 from above. ing.

  The housing body 3 is formed of an aluminum alloy material into a rectangular thin plate shape, and a rectangular block-shaped bulging portion 5 is integrally provided at a predetermined position on the upper surface 3a, and one end side outer edge on both sides. A pair of trapezoidal protrusions 6 and 6 projecting outward are formed. Further, female screw holes 7 are respectively formed at the two corners on the other end side of each of the protrusions 6 and 6 and the both sides. Further, rectangular bracket pieces 8 and 8 are integrally projected on the outer edges of the both sides, and a fixing bolt (not shown) for fixing to the motor casing is inserted into each bracket piece 8 and 8. Bolt insertion holes 8a, 8a are formed through.

  In addition, the bulging portion 5 is further provided with a rectangular shape on both sides of the upper surface, and two rectangular insulating materials on which six semiconductor switch elements 21 (to be described later) abut on the upper surfaces of both the protruding portions 5a and 5a. The heat radiating sheets 9, 9 as members are bonded and fixed in parallel. Each heat radiating sheet 9 is formed in a plate shape by a silicon material or the like, and as shown in FIG. 6, an elongated frame portion 9a protruding upward is integrally provided on the entire outer peripheral edge.

  The cover member 4 is formed of an aluminum alloy material in a substantially rectangular box shape along the outer shape of the housing body 3, and a pair of protrusions 10 and 10 are formed on both outer edges of one end of the lower end side. Bolt insertion holes 12 through which the four fixing bolts 11 are inserted are formed through each protrusion 10 and the other end side corner of the lower end side. Note that a breathing hole 4 a that is closed by a plug 42 is formed in one side wall of the cover member 4.

  The electronic control component 2 disposed between the housing body 3 and the cover member 4 includes a power electronic circuit for supplying power to the stator of the electric motor and a filter electronic circuit for removing radio (electromagnetic) noise. And a control board 14 for controlling the drive of the electric motor.

  The bus bar assembly 13 is integrally formed in a block plate shape by molding with a synthetic resin material, and its outer shape is substantially rectangular along the outer peripheral shape of the housing body 3 and the cover member 4 as shown in FIGS. In addition to being formed in a shape, the bottom surface 13a side is formed in a concave shape and has a substantially U-shaped cross section. Therefore, when the bus bar assembly 13 is placed on the upper portion of the housing main body 3, a gap between the flat upper surface 3 a excluding the bulging portion 5 of the housing main body 3 and the bottom surface 13 a of the bus bar assembly 13 is illustrated. As shown in FIG. 1, a space 15 is formed.

  The bus bar assembly 13 has a pair of projecting portions 16 and 16 integrally projecting at the same position as the projecting portions 6 and 6 of the housing main body 3 on both sides. The four bolt insertion holes 17 through which the four fixing bolts 11 are inserted are formed in the corners of the upper and lower sides.

  The concave bottom surface 13a is formed with six rectangular fitting grooves 13b for holding six semiconductor switch elements 21 to be described later, and three aluminum members to be described later are formed at corners of the bottom surface 13a. A trefoil-shaped cylindrical portion 13c that holds the upper end portion of the electrolytic capacitor 22 is integrally formed. Further, a normal coil holding portion 43 and a common coil holding portion 44 formed adjacent to the cylindrical portion 13c are formed.

  Further, a power connector 18 connected to a battery, a motor connector 19 for supplying electric power to the electric motor, and various kinds of torque sensors, resolvers, CAN communication, I / O, and the like are provided at the front end of the bus bar assembly 13. A signal connector 20 serving as a signal transmission path is integrally provided.

  Further, on the concave bottom surface 13a of the bus bar assembly 13, as shown in FIG. 3, there are six semiconductor switch elements 21 (MOS-FETs) which are components of the power electronic circuit and components of the filter electronic circuit. Three aluminum electrolytic capacitors 22, a normal coil 23, a common coil 24, a plurality of ceramic capacitors 25, a shunt resistor 26 for detecting a power supply current, a motor driving current detection U phase, and a shunt resistor 27 for detecting a V phase, respectively. Is provided. Similarly, on the bottom surface 13a side, there are provided a motor relay 28 and a power supply relay 29 which are turned on and off by turning on and off the ignition switch of the internal vehicle. The motor relay 28 is FS compatible when the motor is abnormal. It is possible to turn it off. On the other hand, the power relay 29 can be turned off in response to FS when the control circuit is abnormal.

  Further, as shown in FIGS. 4 and 5, power distribution patterns such as a power source negative side bus bar 30 connected to the power source connector 18 and a power source positive side bus bar 31 are formed on the upper surface of the bus bar assembly 13. . Further, in the bus bar assembly 13, many power distribution patterns such as an output bus bar 32 for power supply to the motor and a power supply positive side bus bar 33 are embedded.

  Furthermore, a plurality of connecting terminals 34 including a plurality of DC terminals connected to the power connector 18, the motor connector 19 and the signal connector 20, a plurality of AC terminals for outputting AC power generated from DC power, and the like. A plurality of connection terminals such as 35 protrude from the upper surface of the bus bar assembly 13.

  As shown in FIGS. 3 and 6, the six semiconductor switch elements 21 are fitted and held in the respective fitting grooves 13b formed on the bottom surface 13a that is the outer surface side of the bus bar assembly 13. Each of the connection terminals 21 a protruding from the side surface is bent upward and extends upward through a terminal connection hole 13 d formed through the bus bar assembly 13. Each semiconductor switch element 21 has an upper end portion on the upper surface 21b side fitted in each fitting groove 13b, and a lower surface 21c (electrode surface) side having a larger surface area than the upper surface 21b has each heat radiation sheet 9, 9. The upper surface of the frame and the inner surfaces of the frame portions 8a and 8a are held in a fitted state while abutting. Therefore, since the heat radiating sheet 9 is pressed not on the lower surface 21c and the upper surface of the heat radiating sheet 9 but on the lower surface 21c side of the semiconductor switch element 21, the adhesion between the semiconductor switch element 21 and the heat radiating sheet 9 is improved. To improve heat dissipation.

  In addition, around the fitting grooves 13b of the bus bar assembly 13, a cylindrical bush 37 into which seven screws 36 for connecting and fixing the bus bar assembly 13 to the housing body 3 are inserted from above and below. Is fixed through.

  Further, on the upper surface of both sides of the bus bar assembly 13, four locking pieces 38 having a snap-fit structure for supporting the control board 14 are erected at predetermined intervals. Each locking piece 38 is formed in the shape of an elongated plate by the same resin material as that of the bus bar assembly 13, and locking claws 38a for elastically locking both side edges of the control board 14 are provided inside the upper end portion. Is formed.

  The control board 14 is formed in a substantially square thin plate shape by a synthetic resin material, and when both side edges are elastically locked and fixed by the locking claws 38a, the control board 14 is connected to the upper surface of the bus bar assembly 13. There is a slight gap between them so that each electronic component does not interfere.

  A control circuit including a microcomputer is attached to the control board 14, and a control signal for controlling the drive of the inverter (semiconductor switch element 21) that is a drive circuit of the electric motor is generated by the control board 14. . The connection terminals 21a, 34, 35,... Of the bus bar assembly 13 are connected to a plurality of connection terminal holes 14a formed on one side and the other side of the control board 14 by soldering.

  Seal fittings for fitting and fixing two first and second seal members 39 and 40 at the contact positions of the housing body 3 and the cover member 4 are respectively provided on the upper and lower surfaces of the outer peripheral portion of the bus bar assembly 13. The landing groove 41 is formed continuously along the circumferential direction.

[Assembly procedure]
Hereinafter, the assembly procedure of the drive control device will be described. First, the component parts and power distribution patterns of the power electronic circuit and the filter electronic circuit are modularized to form the bus bar assembly 13 integrally, and the control circuit of the control board 14 is formed in advance.

  Next, as shown in FIG. 3, the common coil 24 and the like are fixed to the bus bar assembly 13 by a welding technique such as TIG welding, and each aluminum electrolytic capacitor 22 is attached to the cylindrical shape via an adhesive. The semiconductor switch element 21 is fitted and held in the fitting groove 13b.

  Thereafter, the bus bar assembly 13 is disposed on the upper portion of the housing body 3 via the first seal member 40. At this time, the semiconductor switch element 21 side of the bus bar assembly 13 is fitted and brought into contact with the heat dissipating sheet 9 while the aluminum electrolytic capacitor 22 and the power relay 29 are bulged out of the housing body 3. The space 15 other than the portion 5 is used to be opposed to the flat upper surface 3a with a predetermined gap. Accordingly, the bus bar assembly 13 is positioned.

  After that, as shown in FIG. 5, the bus bar assembly 13 is fixed to the housing body 3 with seven fixing screws 36. As a result, the bus bar assembly 13 can be assembled liquid-tightly to the housing body 3 via the first seal member 39. Further, since each semiconductor switch element 21 can be held between the bottom surface of the fitting groove 13b of the bus bar assembly 13 and the heat radiating sheet 9, the heat generated by the semiconductor switch element 2 is transferred via the heat radiating sheet 9. The bulging portion 5 can dissipate heat.

  Next, the control board 14 is pushed downward along the bus bar assembly 13 while positioning the control board 14 on the locking pieces 38. As a result, each locking piece 38 is elastically deformed outward, and when both side edges of the control board 14 are locked to the respective locking claws 38a, the locking pieces 38 are elastically returned to their original positions and locked to each other. The assembly 13 is placed in a polymerized state.

  At this time, the connection terminals 34, 35... Of the bus bar assembly 13 are inserted into the terminal connection holes 14 a of the control board 14. Thereafter, the connection terminals 21a, 34, 35... Protruding from the terminal connection holes 14a are connected to the terminal connection holes 14a by soldering.

  Subsequently, the cover member 4 is placed on the upper surface of the outer peripheral portion of the bus bar assembly 13 through the second seal member 40 while being positioned, and the four fixing bolts 11 are connected to the bolt insertion holes 12 of the cover member 4 and the bus bar. The bolts are inserted into the bolt insertion holes 17 of the assembly 13 and fixed together through the female screw holes 7 of the housing body 3.

  As a result, as shown in FIG. 8, the bus bar assembly 13 is fixed between the housing body 3 and the cover member 4 while the control board 14 is housed therein, so that the unit body of the drive control device is secured. Assembling is completed.

  Next, when the unit body of the drive control device is assembled and fixed to the upper end portion of the motor casing by two bolts not shown through the bolt insertion holes 8a of the bracket pieces 8 of the housing body 3, the entire body The assembly work is finished.

  As described above, in the present embodiment, the power electronic circuit and the filter electronic circuit are not formed separately from each other in the upper and lower parts and arranged vertically with a gap therebetween, but both are integrated into a module. Thus, the thin bus bar assembly 13 was configured.

  More specifically, the bottom surface 13a side, which is the outer surface side, is formed in a concave shape, the bus bar assembly 13 is formed by molding with a substantially U-shaped cross section, and the semiconductor switch element 21 is held on the bottom surface 13a side. A cylindrical portion 13c that holds the upper end portion of the aluminum electrolytic capacitor 22 that is a component part of the groove 13b and the filter electronic circuit, a normal mode coil holding portion 43 that holds the normal mode coil 23, and a common coil that holds the common coil 24 A holding portion 44 was formed.

  Therefore, by mounting the semiconductor switch element 21 which is a component of the power electronic circuit and the aluminum electrolytic capacitor 22 and the normal mode capacitor 23 which are the components of the filter electronic circuit on the bus bar assembly, the power electronic circuit and the filter electronic circuit are mounted. Modularized and integrated.

  For this reason, it is possible to make the height of the drive control device in the vertical direction sufficiently smaller than that of the prior art, so that the entire device can be reduced in size (thinned) and reduced in weight. Further, along with the downsizing of the apparatus, the degree of freedom of layout in the engine room is improved, and interference with other equipment and piping can be avoided.

  That is, in the engine room in which the electric motor and the drive control device for controlling the electric motor are mounted, other operating devices and various pipes are disposed around the mounting position. In order to avoid this, the mounting space of the drive control device is limited.

  Therefore, in the drive control device of the present embodiment, as described above, the overall size of the device can be reduced (thinned), so that the degree of freedom of layout in the engine room can be improved.

  Further, since the aluminum electrolytic capacitor 22 or the like that is long in the axial direction is disposed on the bottom surface 13a side of the bus bar assembly 13, it is accommodated in the space portion 15 formed through the bulging portion 5 of the housing body 3. Thinning of the device can be further promoted.

  In addition, since the power electronic circuit and the filter electronic circuit are integrated into a module by the bus bar assembly 13, the manufacturing cost can be reduced as compared with the case where they are separately manufactured, and the assembly operation described above is performed. Efficiency can be improved.

  Further, since each semiconductor switch element 21 is in close contact with each heat radiating sheet 9 by being sandwiched, the generated heat can be effectively transmitted to the housing body 3 side through each heat radiating sheet 9. become. In particular, each semiconductor switch element 21 is held in the heat-dissipating sheet 9 and the frame portion 9a so as to have a large contact area, so that the heat transfer is improved and the heat dissipation effect is increased.

  Moreover, since each said connectors 18-20 are integrally formed in the bus-bar assembly 13, these manufacturing operations become easy compared with the case where it forms separately, and these assembly work Can be reduced, so the assembly cost can be reduced.

  In addition, since the shape of the bus bar assembly 13 and the control board 14 is a simple rectangular shape, and the housing body 3 and the cover member 4 are also relatively simple shapes, the number of fixing steps with a small number of fixing bolts 11 can be reduced. The fixing work is also facilitated.

  Since the control board 14 can be locked to the bus bar assembly 13 through the locking pieces 38 with one touch, this assembling operation is also easy.

  Moreover, in this embodiment, since the heat radiating sheet 9 is used without filling the upper surface of the bulging portion 5 of the housing body 3 with the heat radiating grease, these bonding operations are easy.

  Further, the power electronic circuit and the filter electronic circuit are integrated into a module, so that the semiconductor switch element 21 and the aluminum electrolytic capacitor 22, the normal mode coil 23, and the common coil 24, which are components of the filter electronic circuit, are brought closer to each other. Since it can arrange | position, the radio noise which generate | occur | produces by the action | operation of the semiconductor switch element 21 can be suppressed with a filter electronic circuit, and it can suppress that noise leaks outside the cover member 4. FIG.

  The present invention is not limited to the configuration of the above embodiment, and for example, the shape and structure of the housing 1 and the bus bar assembly 13 can be arbitrarily changed. Also, the present invention can be applied to drive control devices for drive devices other than the electric power steering device.

The technical ideas of the invention other than the claims ascertained from the embodiment will be described below.
[Claim a]
The said bus-bar assembly and a control board are accommodated and arrange | positioned in the polymerization state between the housing main body and cover member of the aluminum alloy material, The said housing main body was comprised as the said heat radiating member, The said heat dissipation member is characterized by the above-mentioned. Drive controller for electric actuators.

According to the present invention, it is possible to further promote downsizing of the apparatus by being in a superposed state, and since the housing body itself is a heat radiating member, there is no need to provide a heat radiating mechanism, so that the manufacturing cost can be reduced. Can be reduced.
[Claim b]
A convex bulge is formed on the upper surface of the housing body so that the semiconductor switch element abuts via a heat dissipation sheet, and the semiconductor switch element is formed by the upper surface of the bulge and the bottom surface of the bus bar assembly. The drive control device for an electric actuator according to claim 2, wherein the drive control device is held in a sandwiched state.

According to the present invention, by holding the semiconductor switch element in a sandwiched state, each semiconductor switch element can be securely fixed, and the contact force with the heat radiating sheet is increased to transfer heat from the semiconductor switch element to the housing body. Efficiency is improved.
[Claim c]
The frame part is erected on the outer peripheral edge of the heat radiation sheet, and the outer surface of the semiconductor switch element is held in a fitted state between the upper surface of the heat radiation sheet and the frame part. The drive control apparatus of the described electric actuator.

According to the present invention, since the contact area between the semiconductor switch element and the heat dissipation sheet is increased, the heat dissipation effect is increased.
[Claim d]
A space is formed between an upper surface other than the bulging portion of the housing body and a bottom surface of the bus bar assembly, and electronic components assembled to the lower surface of the bus bar assembly are accommodated through the space. An electric actuator drive control device according to claim b.

  Since a relatively large electronic component such as an aluminum electrolytic capacitor can be accommodated using the space between the housing main body and the bus bar assembly, the overall thickness of the apparatus can be further promoted.

DESCRIPTION OF SYMBOLS 1 ... Housing 2 ... Electronic circuit 3 ... Housing main body 3a ... Upper surface 4 ... Cover member 5 ... Projection part 9 ... Heat dissipation sheet (insulating member)
DESCRIPTION OF SYMBOLS 11 ... Fixing bolt 13 ... Bus-bar assembly 13a ... Bottom surface 13b ... Fitting groove 14 ... Control board (control circuit)
DESCRIPTION OF SYMBOLS 15 ... Space part 18 ... Power supply connector 19 ... Motor connector 20 ... Signal connector 21 ... Semiconductor switch element 22 ... Aluminum electrolytic capacitor

Claims (3)

A drive control device for driving and controlling an electric actuator,
A power electronic circuit for supplying electric power to the electric actuator, a filter electronic circuit for removing electromagnetic noise during energization, and a control circuit for controlling the driving of the electric actuator,
The power electronic circuit and the filter electronic circuit are integrally formed on a bus bar assembly molded with a resin material, and a control board constituting the control circuit is superposed on the bus bar assembly. A drive control device for an electric actuator.   The power electronic circuit includes a semiconductor switch element that switches the current according to the magnitude and direction of the torque of the electric actuator, and the semiconductor switch element is disposed on the outer surface side of the bus bar assembly, and the lower surface of the semiconductor switch element The drive control device for an electric actuator according to claim 1, wherein the heat release member is brought into contact with the heat dissipation member via an insulating member.   3. The drive control of the electric actuator according to claim 2, wherein a tip of a terminal projecting from each of the semiconductor switch elements is connected to a terminal connection hole of the bus bar assembly through the bus bar assembly. apparatus.

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