JP2014161174A - Motor device - Google Patents

Abstract

Provided is a motor device capable of saving space by arranging a circuit board of an ECU in accordance with an installation space of a vehicle and improving assembling and mounting properties.
An ECU 6 includes a power board 18 and a power board 19 that are arranged to face the outer periphery of a motor rotating shaft 2 that the electric motor 1 extends, and a choke coil 14 that connects the power board 18 and the power board 19. The control board 20 is disposed between the power board 18 and the power board 19 in a U-shape. The choke coil 14 is incorporated in a resin holding member 21, and positioning pins 22 provided on the outer wall surfaces of the parallel walls at both ends of the holding member 21 are inserted through holes provided in the power supply board 18 and the power board 19. The power supply board 18 and the power board 19 are positioned and fixed. The control board 20 crosses the power board 18 and the power board 19 and is electrically connected and fixed.
[Selection] Figure 2

Description

  The present invention relates to a motor device.

  In recent years, in an electric motor used for an electric power steering device that assists steering force in accordance with a steering operation and a control device that controls driving of the electric motor, Some have integrated the control device. As this type of control device, the circuit board of the drive circuit unit that controls the rotation of the electric motor and the components of the power circuit unit that supplies power are assembled in an intersecting manner, and are arranged in a plane around the housing of the electric motor. Thus, there has been proposed a vehicle in which the installation space of the vehicle is saved (for example, see Patent Document 1).

JP 2011-83062 A

  The control device as described above is mainly composed of three parts: a power supply circuit unit, a power module of a drive circuit unit, and a control circuit. However, it is necessary to connect a connector connected to an external power supply to the power supply circuit unit, and a bus bar or the like is used. In addition, the parts of the power supply circuit unit and the drive circuit unit are large, and the component arrangement may be limited. Since the installation space for the electric motor and the control device is also limited, it is possible to mount a vehicle such as a bus bar that forms a power circuit section, a control circuit board for the drive circuit section and a power module, and a bus bar that connects the electric motor and the drive circuit section Therefore, it is necessary to design a new optimum shape according to the situation. Further, in the electric power steering device, when the control device is arranged between the electric motor and the speed reduction mechanism with respect to the axial direction of the electric motor, a control circuit board is arranged between the power supply circuit portion of the control device and the power module. Thus, the control device cannot be made small.

  The present invention has been made to solve the above-described problems, and its purpose is to reduce the space by arranging the circuit board of the control device according to the installation space of the vehicle. It is providing the motor apparatus which can improve.

  In order to solve the above-described problem, a motor device according to claim 1 includes an electric motor and a control device that is integrally assembled with the electric motor and performs drive control of the electric motor. Includes a power unit that supplies a driving current to the electric motor, and a control unit that controls the power unit, and the power unit includes a power circuit board connected to an external power source, and a plurality of switching elements. A power circuit board that supplies power to the electric motor, and a filter coil that is provided separately and that is electrically connected between the power circuit board and the power circuit board that are arranged to face each other. The gist is that it consists of three structural units.

  According to the above configuration, the power unit of the control device that drives and controls the electric motor is configured by connecting the coil for the power supply filter of the large component that is provided separately between the power circuit board and the power circuit board facing each other. can do. Thereby, the shape of the control device can be changed according to the installation space without being limited to the component arrangement in the power unit. As a result, it is possible to improve the assemblability and mountability of the motor device.

  According to a second aspect of the present invention, in the motor device according to the first aspect, the control circuit board constituting the control unit intersects the power circuit board and the power circuit board included in the power unit. The gist is that it is arranged in a substantially U-shape. According to the above configuration, the power circuit board and the power circuit board are arranged to face each other to form the power unit, and the control circuit board is arranged in a substantially U shape so as to intersect the power circuit board and the power circuit board. Can do. Thus, power can be directly supplied from the power circuit board to the power circuit board, and the control board can be arranged in series between the power circuit board and the power circuit board. As a result, it is possible to easily change the shape of the control device according to the installation space of the vehicle.

  According to a third aspect of the present invention, in the motor device according to the first or second aspect, the coil is integrally accommodated in a resin-made holding member, and the holding member is a wall that fixes both ends of the coil. The gist of the present invention is to provide a protrusion for positioning and fixing the power circuit board and the power circuit board on the outer surface of the part. According to the above configuration, the power supply circuit board and the power circuit board can be electrically connected to each other with the coil interposed therebetween without using the control circuit board. Further, since the power supply circuit board and the power circuit board can be easily positioned by the holding member that accommodates the coil without using a dedicated jig, the number of assembling steps can be reduced.

  According to the present invention, it is possible to provide a motor device that can save space by arranging the circuit board of the control device in accordance with the installation space of the vehicle, and can improve assembling and mounting properties.

1 is a block diagram of a motor control circuit included in a motor device according to a first embodiment of the present invention. The block diagram of the control apparatus seen from the front side of the motor rotating shaft which concerns on the 1st Embodiment of this invention. Schematic which shows the coil and holding member of FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic partial cross-sectional view of an electric motor and control device part in which a motor device according to a first embodiment of the present invention is applied to an electric power steering device. The block diagram of the control apparatus seen from the front side of the motor rotating shaft which concerns on the 2nd Embodiment of this invention.

Next, a motor device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram of a motor control circuit included in the motor device 10 according to the first embodiment of the present invention. The motor control circuit shown in FIG. 1 includes an external power connector 17, a power relay 11, a power filter capacitor 16, a choke coil 14, a smoothing capacitor 12, a control circuit 15, and a motor drive circuit 13. This motor control circuit is provided inside a control device (hereinafter referred to as ECU) 6 and is connected to a battery 100 and an electric motor 1 which are external DC power sources (for example, 12V). Note that a control voltage (for example, 12 V) + B serving as a power source for the control circuit 15 is generated from the battery 100.

  In FIG. 1, the ECU 6 has three types of circuit boards: a power board 18 on which large current power components such as relays and switching elements are mounted, a power board 19, and a control board 20 on which small current control circuit parts are mounted. It is comprised by.

  The electric motor 1 is a three-phase brushless motor having three-phase windings (U-phase winding, V-phase winding, and W-phase winding, not shown). An external power connector 17 for supplying DC power from the external battery 100 is disposed on the control board 20, and each terminal is connected and wired to the battery 100.

  The power relay 11 is a power switch that is arranged in the power section of the ECU 6 and switches whether the smoothing capacitor 12 and the motor drive circuit 13 are connected to the battery 100. The power supply relay 11 is turned on (conductive state) when the motor device 10 is operating, and is turned off (non-conductive state) when stopped.

  The motor drive circuit 13 includes six MOSFETs (not shown) as switching elements. Three circuits (arms) formed by connecting two of these six MOSFETs in series are provided in parallel between the power supply line L1 and the ground line L2. Each connection point of the MOSFET is directly connected to one end of the U-phase winding, the V-phase winding, and the W-phase winding. The other end of the three-phase winding of the electric motor 1 is connected to a common connection point (neutral point).

  The control circuit 15 is disposed in the control unit of the ECU 6 and controls six MOSFETs included in the motor drive circuit 13. More specifically, the control circuit 15 determines a target value (target current) of three-phase drive currents (U-phase current, V-phase current, and W-phase current) to be supplied to the electric motor 1, and the current sensor A PWM signal for matching the current (each phase current value) detected by the above to the target current is output. The PWM signal of each phase output from the control circuit 15 is supplied to the gate terminals of six MOSFETs included in the motor drive circuit 13.

  The smoothing capacitor 12 is provided between the power supply line L1 and the ground line L2. The smoothing capacitor 12 accumulates charges, and discharges the accumulated charges when the current flowing from the battery 100 to the motor drive circuit 13 is insufficient. Thus, the smoothing capacitor 12 functions as a capacitor that absorbs current ripple and smoothes the power supply voltage for driving the electric motor 1. Further, in the motor device 10 of the present embodiment, after the power supply relay 11 is turned off, the electric charge accumulated in the smoothing capacitor 12 is discharged by turning on a switch (for example, a MOSFET, not shown). (Not shown) or discharged through the MOSFET in which the motor drive circuit 13 is turned on.

  The choke coil 14 is a large-sized large current coil for surge absorption (noise removal) that constitutes a power supply filter unit together with the capacitor 16. The choke coil 14 has both ends of a lead wire connected to a power bar board 18 and a bus bar terminal on the board of the power board 19.

  Next, FIG. 2 is a configuration diagram of the ECU 6 viewed from the front side of the motor rotating shaft 2 according to the first embodiment of the present invention. As shown in FIG. 2, the electric motor 1 and the ECU 6 have a structure arranged on the axis with respect to the motor rotation shaft 2. A power supply board 18 and a power board 19 of the power unit are arranged opposite to each other in the axial direction with the motor rotating shaft 2 extending from the electric motor 1 interposed therebetween. An external power connector 17, a power relay 11, and a capacitor 16 are mounted on the power board 18. The power substrate 19 is mounted with a smoothing capacitor 12 and a part of a motor drive circuit 13 (see FIG. 1) for driving the electric motor 1 (for example, a switching element such as a MOSFET). The power supply board 18 and the power board 19 are made of, for example, a multilayer board made of an aluminum plate, on which circuit components are mounted on one side. A heat sink (heat radiating member) 31 made of metal (for example, an aluminum member) is disposed in surface contact with the aluminum portion on the back surface of the power substrate 19 so as to be capable of conducting heat.

  The power board 18 and the power board 19 are positioned and fixed by a holding member 21 incorporating the choke coil 14 at one end. The power supply board 18 and the power board 19 are positioned in parallel with the holding member 21 interposed therebetween. The power supply board 18 and the power board 19 are electrically connected via the choke coil 14. That is, both ends of the lead wire of the choke coil 14 are fixed by inserting through holes provided in the power supply substrate 18 and the power substrate 19 and welding or soldering to the substrate. .

  A control circuit 15 (see FIG. 1) for controlling the motor drive circuit 13 is mounted on the control board 20. The control circuit 15 includes a driver unit that controls each MOSFET of the motor drive circuit 13, a CPU (microcomputer) that controls the driver unit, and peripheral circuit elements. The control board 20 is disposed so as to intersect the power supply board 18 and the power board 19, and both ends thereof are electrically connected and fixed to the power supply board 18 and the power board 19 by bus bars (not shown) or the like. In addition, the power supply board 18, the power board 19, and the control board 20 are comprised by the board | substrate of 1 sheet (integral), and may be electrically connected.

  FIG. 3 is a schematic view showing the choke coil 14 and the holding member 21 of FIG. As shown in FIG. 3, the choke coil 14 is formed by winding a copper wire around a magnetic core (for example, a ferrite magnet), and is fitted and fixed to a resin holding member 21. In the holding member 21, the outer surface of the wall portion that fixes both ends of the lead wire of the choke coil 14 is in contact with the back surface of the power supply substrate 18 and the power substrate 19 (see FIG. 2). A positioning pin (protrusion) 22 is inserted through an insertion hole provided in the substrate 19. Note that the positioning pin 22 may not be provided.

  Next, FIG. 4 is a schematic partial cross-sectional view of the electric motor 1 and ECU 6 portion in which the motor device 10 according to the first embodiment of the present invention is applied to a column assist type electric power steering device.

  The electric motor 1 includes a motor housing 27, a rotor 25 and a stator 26 accommodated in the motor housing 27. The rotor 25 includes an annular rotor core that is attached to the outer periphery of the motor rotating shaft 2 so as to be able to rotate along with the rotor, and a rotor magnet that is attached to the outer periphery of the rotor core so as to be able to rotate along with the rotor. Yes. A plurality of magnetic poles are arranged in the circumferential direction on the rotor magnet. These magnetic poles are configured so that the N pole and the S pole are alternately switched in the circumferential direction of the rotor 25.

  The stator 26 is fixed to the inner periphery of the motor housing 27. The stator 26 includes a stator core fixed to the inner periphery of the motor housing 27 and a plurality of coils. The stator core includes an annular yoke (not shown) of the stator core and a plurality of teeth (not shown) protruding radially inward from the inner periphery of the yoke. Each motor coil is wound around a corresponding tooth.

  The motor coil wound around each tooth is connected to a bus bar (not shown). The bus bar is a conductive connecting material used for a connection portion between each motor coil and a current application line, and functions as a power distribution member for distributing power from a power supply source to each motor coil.

  An ECU housing portion for housing the ECU 6 is formed in the gear housing 28 by first and second housings 29 and 30 extending upward in the axial direction. The motor rotating shaft 2 is rotatably supported by a bearing held by the motor housing 27 and a bearing held by the gear housing 28. All the bearings are constituted by sealed bearings.

  With the above configuration, the motor rotating shaft 2 is accommodated in the gear housing 28 as the housing, the first and second housings 29 and 30, and the motor housing 27, and is supported via corresponding bearings.

  A power supply board 18, a power board 19, and a control board 20 that constitute a part of the ECU 6 are accommodated and held in the ECU accommodation portion. Here, the wall portion of the second housing 30 functions as a heat sink. Further, the outer wall surface of the wall portion is in contact with the gear housing 28. The bus bar connected to each coil is connected to the power board 19 via a bus bar terminal by, for example, screwing. The axial bottom portion of the heat sink 31 (see FIG. 2) is disposed in surface contact with the axial upper surface of the second housing 30 so as to allow heat conduction. The bottom surface of the heat sink 31 in the axial direction is in contact with the upper end surface of the gear housing 28 to form a heat dissipation path. Further, the heat sink 31 is fixed to the gear housing 28 by, for example, screwing in a state where there is no gap on the contact surface with the gear housing 28.

  Next, the operation and effect of the motor apparatus 10 according to the embodiment of the present invention configured as described above will be described.

  According to the above configuration, the ECU 6 includes the power board 18 and the power board 19 of the power unit disposed to face the outer periphery of the motor rotating shaft 2 from which the electric motor 1 extends, and the power board 18 separated from the outside. The choke coil 14 provided between the power board 19 and the control board 20 of the control unit disposed between the power board 18 and the power board 19 in a U-shape. An external power connector 17, a power relay 11, and a power filter capacitor 16 are mounted on the power substrate 18. The power substrate 19 is mounted with a smoothing capacitor 12 and a part of a motor drive circuit 13 for driving the electric motor 1 (for example, MOSFET). A choke coil 14 for a large-sized, large-current power supply filter is incorporated and fixed in a resin-made holding member 21, and positioning pins 22 are provided on parallel outer wall surfaces on both sides of the holding member 21. The holding member 21 positions and fixes the power supply board 18 and the power board 19 in parallel by the wall portions on both sides. The wall portion of the holding member 21 is not limited to being parallel, and may be formed with an angle (inclination).

  The choke coil 14 housed in the holding member 21 and provided separately is disposed between the opposing power supply board 18 and power board 19 to electrically connect and fix the power supply board 18 and power board 19. Both ends of the lead wire of the choke coil 14 are inserted into insertion holes provided in the power supply substrate 18 and the power substrate 19 and welded to the substrate or soldered to the substrate. As a result, direct-current power is directly supplied from the power supply board 18 to the power board 19. A control circuit 15 that controls the motor drive circuit 13 is mounted on the control board 20. The control circuit 15 includes a driver unit that controls each MOSFET of the motor drive circuit 13, a CPU that controls the driver unit, and peripheral circuit elements thereof. The control board 20 is disposed in a U shape so as to intersect the power board 18 and the power board 19 and is electrically connected and fixed to the power board 18 and the power board 19 by a bus bar or the like. As described above, the ECU 6 can be disposed adjacent to the power supply board 18, the control board 20, and the power board 19 in this order.

  Thereby, it is not limited to arrangement | positioning of the large sized parts (a coil, a capacitor | condenser, etc.) which comprise a power part, The shape change of ECU6 can be carried out according to installation space, such as a vehicle. Further, the power supply board 18 and the power board 19 can be electrically connected to each other with the choke coil 14 interposed therebetween without using the control board 20. Further, since the power supply board 18 and the power board 19 can be easily positioned by the choke coil 14 and the holding member 21 that accommodates the choke coil 14 without requiring a dedicated jig, the number of assembling steps of the ECU 6 can be reduced. As a result, it is possible to improve the assembling property and mounting property of the motor device 10.

  As described above, according to the embodiment of the present invention, it is possible to provide a motor device that can save space by arranging the circuit board of the ECU according to the installation space of the vehicle, and can improve the assembling property and the mounting property. .

  As mentioned above, although embodiment which concerns on this invention was described, this invention can also be implemented with another form.

  In the above embodiment, the control board 20 is arranged on the outer periphery of the motor rotation shaft 2 so as to intersect the power supply board 18 and the power board 19 facing each other at the right angle with the same board length in the direction perpendicular to the axial direction. However, the present invention is not limited to this, and when the board lengths are different, the mounting angles of the power board 18 and the power board 19 and the control board 20 are arbitrarily changed, for example, the control board 20 is disposed obliquely. You may do it.

  FIG. 5 is a configuration diagram of the ECU 6 as seen from the front side of the motor rotating shaft 2 according to the second embodiment of the present invention. As shown in FIG. 5, the power supply board 18 and the power board 19 having different lengths constituting the ECU 6 are arranged in parallel so as to be in contact with an arbitrary circumference (substrate placement circle) C indicating a board mounting range. A holding member 21 containing the choke coil 14 is disposed between the power board 18 and the power board 19 in the circumference C, and the power board 18 and the power board 19 are electrically connected by the choke coil 14. Yes. Further, the control board 20 is disposed in a substantially U-shape obliquely intersecting the power supply board 18 and the power board 19, and both ends of the control board 20 and one end of the power supply board 18 and the power board 19 are electrically connected. It is connected to the. Thereby, even when the power board 18 and the power board 19 of the power section are different in length, the shortest distance between the power board 18 and the power board 19 can be easily set. Further, the power board 18 and the power board 19 can be positioned by changing the length and shape of the choke coil 14 and the holding member 21.

  In the above embodiment, an example in which the power supply board 18 and the power board 19 are connected using the choke coil 14 and the holding member 21 has been described. However, the present invention is not limited to this, and the board and other components such as a bus bar are fixed. You may make it connect using components.

  In the above-described embodiment, an example in which the power supply board 18, the power board 19, and the control board 20 divided into three pieces are arranged and connected has been described. However, the present invention is not limited to this. You may apply to (a power part and a control part are included).

  In the above embodiment, the power supply board 18, the power board 19, and the control board 20 are not limited to board members, and for example, an insulating board made of glass epoxy resin may be used.

  In the above embodiment, a so-called column assist type has been described as an example of the electric power steering device. Moreover, you may apply to the motor apparatus 10 of the other use which drive-controls the electric motor 1. FIG.

1: electric motor, 2: motor rotating shaft, 6: ECU, 10: motor device, 11: power relay, 12: smoothing capacitor, 13: motor drive circuit, 14: choke coil, 15: control circuit, 16: capacitor, 17: External power connector, 18: Power board, 19: Power board,
20: control board, 21: coil holding member, 22: positioning pin, 25: stator, 26: rotor, 27: motor housing, 28: gear housing, 29, 30: first and second housings, 31: heat sink, 100: battery, L1: power supply line, L2: ground line, C: board placement circle

Claims (3)

An electric motor;
A controller that is integrally assembled with the electric motor and performs drive control of the electric motor,
The controller is
A power unit for supplying a driving current to the electric motor;
A control unit for controlling the power unit,
The power unit includes a power circuit board connected to an external power source, a power circuit board that includes a plurality of switching elements and supplies power to the electric motor, and is provided separately from the power source disposed opposite to the power circuit board. A motor device comprising three structural units of a filter coil for electrically connecting a circuit board and the power circuit board. The motor device according to claim 1,
The control circuit board constituting the control unit is arranged in a substantially U shape so as to intersect the power circuit board and the power circuit board included in the power unit. The motor device according to claim 1 or 2,
The coil is integrally accommodated in a resin-made holding member, and the holding member includes a protruding portion that positions and fixes the power circuit board and the power circuit board on an outer wall surface that fixes both ends of the coil. A motor device characterized by the above.

Images