JP2017204967A - Motor drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor drive device capable of suppressing a temperature difference between positions where motor drive circuits are provided even in a case where a plurality of motor drive circuits are provided on a substrate.SOLUTION: In a motor drive device 100, on one surface of a substrate 10, a first motor drive circuit 11A for driving a first motor 1A and a third motor drive circuit 11C for driving a third motor 1C at the same timing as the first motor 1A are provided at diagonal positions, and a second motor drive circuit 11B for driving a second motor 1B at a time not overlapped with a time when the first motor 1A is driven and a fourth motor drive circuit 11D for driving a fourth motor 1D at the same timing as the second motor 1B are provided at diagonal positions. Therefore, a temperature difference between the respective regions where the motor drive circuits are provided can be suppressed.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a motor drive device in which a plurality of motor drive circuits are provided on a substrate.

  When driving one member, there are cases where it is driven by two motors. In this case, two motor drive circuits are required. Further, in order to drive other members in the same manner, two more motors are required, and a total of four motor drive circuits are required. On the other hand, a configuration in which a plurality of motor drive circuits are provided in one motor drive device has been proposed (see Patent Document 1).

JP2015-89245A

  Since the motor drive circuit includes a field effect transistor or the like, the motor drive circuit generates a large amount of heat. For this reason, when the four motor drive circuits are provided on one motor drive device, if the four motor drive circuits are configured on one substrate, temperature variations occur at the locations where the four motor drive circuits are provided. As a result, the characteristics of the four motor drive circuits vary, causing differences in the operation of the two motors that drive the common member, which hinders stable driving of the member.

  In view of the above problems, an object of the present invention is to provide a motor drive device that can suppress a temperature difference at a location where a motor drive circuit is provided even when a plurality of motor drive circuits are provided on a substrate. There is.

  In order to solve the above-described problems, a motor driving device according to the present invention includes a substrate, a first motor driving circuit that is provided on one surface of the substrate and drives the first motor, and the first motor driving circuit on one surface of the substrate. A second motor driving circuit which is provided at a position adjacent to one motor driving circuit on one side in the first direction and drives the second motor at a time not overlapping with the first motor; A third motor drive circuit provided at a position adjacent to one side of the second direction intersecting the first direction with respect to the second motor drive circuit, and driving the third motor at the same timing as the first motor; A fourth motor drive circuit which is provided at a position adjacent to one side in the second direction with respect to the first motor drive circuit on one side of the substrate and drives the fourth motor at the same timing as the second motor. , Characterized by having a.

  In the present invention, on one side of the substrate, a first motor driving circuit that drives the first motor and a third motor driving circuit that drives the third motor at the same timing as the first motor are provided at diagonal positions, A second motor driving circuit that drives the second motor during a time that does not overlap the first motor and a fourth motor driving circuit that drives the fourth motor at the same timing as the second motor are provided at diagonal positions. For this reason, even if heat generation occurs in the motor drive circuit, a temperature difference in each region where the motor drive circuit is provided can be suppressed.

In the present invention, the first motor driving circuit, the second motor driving circuit, the third motor driving circuit, and the fourth motor driving circuit are each provided with a plurality of field effect transistors. can do. In such a configuration, in the motor drive circuit,
Although the heat generated in the field effect transistor is large, even in such a case, according to the present invention, the temperature difference in each region where the motor drive circuit is provided can be suppressed.

  In the present invention, a bus bar for supplying power to the first motor driving circuit, the second motor driving circuit, the third motor driving circuit, and the fourth motor driving circuit is provided on one side of the substrate. Preferably it is. According to such a configuration, a large current can be supplied to the motor drive circuit.

  In the present invention, on one side of the substrate, as the bus bar, a first bus bar extending in the first direction and electrically connected to the first motor driving circuit and the second motor driving circuit, A potential different from that of the first bus bar is applied, and the first motor driving circuit extends in the first direction at a position adjacent to the first bus bar on one side or the other side in the second direction. A second bus bar electrically connected to the second motor driving circuit; and the third motor driving by extending in the first direction on one side of the second direction from the first bus bar and the second bus bar. A third bus bar electrically connected to the circuit and the fourth motor drive circuit, and a potential different from that of the third bus bar is applied, and the front side of the first bus bar and the second bus bar is on one side in the second direction. The third bus bar extends in the first direction at a position adjacent to one side or the other side in the second direction and is electrically connected to the third motor drive circuit and the fourth motor drive circuit. A mode in which the fourth bus bar is provided can be employed. According to this configuration, the first bus bar and the second bus bar are electrically connected to the first motor driving circuit and the second motor driving circuit, and the third bus bar and the fourth bus bar are connected to the third motor driving circuit and the fourth motor driving circuit. Although electrically connected to the motor drive circuit, the first motor drive circuit and the second motor drive circuit operate at a timing that does not overlap, and the third motor drive circuit and the fourth motor drive circuit do not overlap. Operate. For this reason, since the electric current which flows through each bus bar can be suppressed small, the heat_generation | fever in a bus bar can be suppressed.

  In the present invention, a fifth bus bar extending in the second direction and connected to an end of the first bus bar and an end of the third bus bar, and extending in the second direction and the second bus bar. An aspect having a sixth bus bar connected to an end portion of the bus bar and an end portion of the fourth bus bar can be employed. According to this configuration, a potential can be applied to the first bus bar and the third bus bar via the fifth bus bar, and a potential can be applied to the second bus bar and the fourth bus bar via the sixth bus bar. Therefore, it is easy to supply potential to the first bus bar, the second bus bar, the third bus bar, and the fourth bus bar.

  In the present invention, the fifth bus bar is connected to end portions on the same side in the first direction of the first bus bar and the third bus bar, and the sixth bus bar is connected to the second bus bar and the fourth bus bar. The aspect connected with the edge part of the said same side in a said 1st direction is employable. According to this configuration, since the fifth bus bar and the sixth bus bar are arranged on the same side in the first direction, wiring to the fifth bus bar and the sixth bus bar is easy.

  In the present invention, the first bus bar, the second bus bar, the third bus bar, and the fourth bus bar are arranged from one side to the other side in the second direction, and the second bus bar, the first bus bar, The third bus bar and the fourth bus bar may be provided in this order, and the fifth bus bar and the sixth bus bar may be three-dimensionally crossed and extend in the second direction.

In the present invention, the first bus bar, the second bus bar, the third bus bar, and the fourth bus bar are arranged from one side to the other side in the second direction, and the second bus bar, the first bus bar, The fourth bus bar and the third bus bar may be provided in this order, and the fifth bus bar and the sixth bus bar may be arranged in parallel in the first direction and extending in the second direction.

  In the present invention, it is preferable that the first bus bar, the second bus bar, the third bus bar, and the fourth bus bar are made of metal members having the same shape and size.

  In this invention, it is preferable that the said board | substrate is accommodated in the case provided with the heat sink.

  In the present invention, on one side of the substrate, a first motor driving circuit that drives the first motor and a third motor driving circuit that drives the third motor at the same timing as the first motor are provided at diagonal positions, A second motor driving circuit that drives the second motor during a time that does not overlap the first motor and a fourth motor driving circuit that drives the fourth motor at the same timing as the second motor are provided at diagonal positions. For this reason, even if heat generation occurs in the motor drive circuit, a temperature difference in each region where the motor drive circuit is provided can be suppressed.

It is explanatory drawing which shows the circuit structure of the motor drive device to which this invention is applied. It is a disassembled perspective view of the motor drive device shown in FIG. It is a perspective view which shows the structure of the one surface side of the board | substrate of the 1st structural example of the motor drive device to which this invention is applied. It is a top view of the board | substrate shown in FIG. It is a disassembled perspective view of the state which removed the 5th bus bar and the 6th bus bar from the board | substrate shown in FIG. FIG. 4 is an exploded perspective view in a state where all bus bars are removed from the substrate shown in FIG. 3. It is the perspective view which looked at the board | substrate shown in FIG. 3 from the other side of the 1st direction. It is a perspective view which shows the structure of the one surface side of the board | substrate of the 2nd structural example of the motor drive device to which this invention is applied. It is a top view of the board | substrate shown in FIG. It is a disassembled perspective view of the state which removed the 5th bus bar and the 6th bus bar from the board | substrate shown in FIG. It is a disassembled perspective view of the state which removed all the bus bars from the board | substrate shown in FIG. It is the perspective view which looked at the board | substrate shown in FIG. 8 from the other side of the 1st direction.

  Hereinafter, a motor drive device to which the present invention is applied will be described with reference to the drawings. In the following description, one of two directions intersecting each other in the in-plane direction of the substrate 10 is a first direction X, the other is a second direction Y, and a direction perpendicular to the substrate 10 is a third direction Z. explain. Further, one side of the first direction X, the second direction Y, and the third direction Z will be described with X1, Y1, and Z1, and the other side will be described with X2, Y2, and Z2.

(Schematic configuration of motor drive device)
FIG. 1 is an explanatory diagram showing a circuit configuration of a motor drive device to which the present invention is applied. FIG. 2 is an exploded perspective view of the motor drive device shown in FIG.

  As shown in FIG. 1, the motor drive device 100 drives a first motor drive circuit 11A that drives the first motor 1A, a second motor drive circuit 11B that drives the second motor 1B, and a third motor 1C. A third motor drive circuit 11C and a fourth motor drive circuit 11D that drives the fourth motor 1D are provided. The power source of the motor driving device 100 is a battery 1600.

  Here, the first motor 1A and the third motor 1C drive the first member 2A simultaneously, and the second motor 1B and the fourth motor 1D drive the first member 2A by the first motor 1A and the third motor 1C. The second member 2B is simultaneously driven at a timing different from the timing to perform.

  Specifically, when there is a command to drive the first member 2A, the first motor drive circuit 11A and the third motor drive circuit 11C drive the first motor 1A and the third motor 1C. Meanwhile, the second motor drive circuit 11B and the fourth motor drive circuit 11D stop driving the second motor 1B and the fourth motor 1D.

  On the other hand, when there is a command to drive the second member 2B, the second motor drive circuit 11B and the fourth motor drive circuit 11D drive the second motor 1B and the fourth motor 1D. Meanwhile, the first motor driving circuit 11A and the third motor driving circuit 11C stop driving the first motor 1A and the third motor 1C.

  Accordingly, the first motor drive circuit 11A and the third motor drive circuit 11C operate at the same timing, and the second motor drive circuit 11B and the fourth motor drive circuit 11D operate at the same timing. Further, the first motor drive circuit 11A and the second motor drive circuit 11B operate at a timing that does not overlap, and the third motor drive circuit 11C and the fourth motor drive circuit 11D operate at a timing that does not overlap.

  As shown in FIG. 2, the motor drive device 100 has a substrate 10 on which the above-described motor drive circuit and the like are mounted, and the substrate 10 is a metal case provided with a heat sink 71 made of radiating fins or the like. 70. Therefore, since the heat generated in the substrate 10 can be efficiently released through the case 70, the temperature rise of the substrate 10 can be suppressed. The substrate 10 is made of, for example, a glass-epoxy substrate.

  A cover 90 is fixed to the open end of the case 70 via a gasket 80. The cover 90 is provided with a plurality of cable glands 91, and the substrate 10 and the outside are electrically connected via the cable glands 91 via wiring (not shown).

(Detailed configuration of first configuration example of motor driving device 100)
FIG. 3 is a perspective view showing a configuration of one surface side of the substrate 10 of the first configuration example of the motor driving apparatus 100 to which the present invention is applied. 4 is a plan view of the substrate 10 shown in FIG. FIG. 5 is an exploded perspective view of the substrate 10 shown in FIG. 3 with the fifth bus bar 25 and the sixth bus bar 26 removed. FIG. 6 is an exploded perspective view showing a state where all the bus bars are removed from the substrate 10 shown in FIG. 7 is a perspective view of the substrate 10 shown in FIG. 3 as viewed from the other side X2 in the first direction X. As shown in FIG.

  As shown in FIGS. 3, 4, 5, and 6, the motor driving device 100 of this embodiment is provided with the motor driving circuit described with reference to FIG. 1 on one side of the substrate 10. In this embodiment, on one surface of the substrate 10, the first motor drive circuit 11A is configured in the other side X2 in the first direction X, and one side in the first direction X with respect to the first motor drive circuit 11A. A second motor drive circuit 11B is collectively configured at positions adjacent to each other at X1. Further, on one surface of the substrate 10, a third motor drive circuit 11C is collectively configured at a position adjacent to the second motor drive circuit 11B on one side Y1 in the second direction Y. Further, on one surface of the substrate 10, a fourth motor drive circuit 11D is collectively configured at a position adjacent to the first motor drive circuit 11A on the one side Y1 in the second direction Y, and the fourth motor drive. The circuit 11D is located on the other side X2 in the first direction X with respect to the first motor drive circuit 11A. Therefore, the first motor drive circuit 11A and the third motor drive circuit 11C are located diagonally, and the second motor drive circuit 11B and the fourth motor drive circuit 11D are located diagonally.

  Each of the first motor drive circuit 11A, the second motor drive circuit 11B, the third motor drive circuit 11C, and the fourth motor drive circuit 11D includes a plurality of field effect transistors 121, a resistance element 122, a power tap 123, and the like. Is provided.

(Configuration of bus bar 20 etc.)
In this embodiment, a plurality of bus bars 20 for supplying power to the first motor drive circuit 11A, the second motor drive circuit 11B, the third motor drive circuit 11C, and the fourth motor drive circuit 11D are provided on one side of the substrate 10. A plurality of field effect transistors 121 are provided along the extending direction of the bus bar 20. The bus bar 20 is made of a metal plate such as aluminum or copper, and has a thickness of 1 to 2 mm, for example.

  In the present embodiment, the plurality of bus bars 20 pass in the second direction Y between the first motor drive circuit 11A and the fourth motor drive circuit 11D and through the second motor drive circuit 11B and the third motor drive circuit 11C. Four are provided so as to extend in the first direction X.

  More specifically, in the present embodiment, the first bus bar 21 extending in the first direction X and electrically connected to the first motor drive circuit 11A and the second motor drive circuit 11B as the plurality of bus bars 20; The first bus bar 21 extends in the first direction X at a position adjacent to the first bus bar 21 on one side Y1 or the other side Y2 in the second direction Y, and is electrically connected to the first motor drive circuit 11A and the second motor drive circuit 11B. A second bus bar 22 connected to the second bus bar 22 is provided. Different potentials are applied to the first bus bar 21 and the second bus bar 22. More specifically, the first bus bar 21 is for power supply, and the second bus bar 22 is for ground.

  In the present embodiment, as the bus bar 20, a third bus bar 23 and a fourth bus bar 24 are provided on one side Y <b> 2 in the second direction Y from the first bus bar 21 and the second bus bar 22. The third bus bar 23 extends in the first direction X and is electrically connected to the third motor drive circuit 11C and the fourth motor drive circuit 11D. The fourth bus bar 24 is second with respect to the third bus bar 23. It extends in the first direction X at a position adjacent to one side Y1 or the other side Y2 in the direction Y and is electrically connected to the third motor drive circuit 11C and the fourth motor drive circuit 11D. In this embodiment, different potentials are applied to the third bus bar 23 and the fourth bus bar 24. More specifically, the third bus bar 23 is for power supply like the first bus bar 21, and the fourth bus bar 24 is for ground like the second bus bar 22.

  The first bus bar 21 and the second bus bar 22 are arranged in parallel, and the third bus bar 23 and the second bus bar 22 are arranged in parallel. In the present embodiment, a connector 126, a capacitor 127, and a capacitor 126 are provided by using a space between a portion where the first bus bar 21 and the second bus bar 22 are disposed and a portion where the third bus bar 23 and the fourth bus bar 24 are disposed. An inductor 128 and the like are arranged.

  The first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24 are made of metal members having the same shape and size. For this reason, since parts can be shared, costs can be reduced.

In this embodiment, the first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24 are respectively connected to the first plate portions 211, 221, 231, and 241 arranged perpendicular to the substrate 10. The plate-like member includes a plurality of second plate portions 212, 222, 232, and 242 that are bent from an end portion of the plate portion on the substrate 10 side and are parallel to the substrate 10. The second plate portions 212, 222, 232, and 242 protrude from the end portions of the first plate portions 211, 221, 231, and 241 to the one side Z <b> 1 in the third direction Z and then become parallel to the substrate 10. Is bent. Therefore, the first plate portions 211, 221, 231, and 241 are separated from the substrate 10 to the other side Z 2 in the third direction Z in a state where the second plate portions 212, 222, 232, and 242 are stacked on the substrate 10. Yes.

  The first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24 configured in this way are respectively connected to the first bus bar 21, the second bus bar 22, the second bus bar 24 through the through holes 101 provided in the substrate 10. The third bus bar 23 and the fourth bus bar 24 are fixed to the substrate 10 by screws 209 fixed to the second plate portions 212, 222, 232 and 242 from the opposite side. A conductive layer is formed in the through hole 101, and a first motor drive circuit 11A, a second motor drive circuit 11B, and a third motor are formed from lands (not shown) formed around the through hole. A wiring pattern (not shown) extends toward the drive circuit 11C and the fourth motor drive circuit 11D.

  In the present embodiment, the first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24 respectively have the second plate portions 212, 222, 232, and 242 in the same direction (one side Y1 in the second direction Y). Is aimed at. Therefore, as will be described later, in a plan view as viewed from the third direction Z, one of the second plate portion 212 of the first bus bar 21 and the second plate portion 222 of the second bus bar 22 is the first of the other bus bar. One of the second plate portion 232 of the third bus bar 23 and the second plate portion 242 of the fourth bus bar 24 overlaps the first plate portion of the other bus bar.

  In this embodiment, the first bus bar 21 and the third bus bar 23 are located on the other side X2 in the first direction X by a predetermined distance from the second bus bar 22 and the fourth bus bar 24. However, the first bus bar 21 and the third bus bar 23 are provided at the same position in the first direction X, and the second bus bar 22 and the fourth bus bar 24 are provided at the same position in the first direction X.

(Configuration of fifth bus bar 25, sixth bus bar 26, etc.)
On one side of the substrate 10, the end 214 on the other side X <b> 2 in the first direction X of the first bus bar 21 and the other side X <b> 2 in the first direction X of the third bus bar 23 extend in the second direction Y. The fifth bus bar 25 connected to the end portion 234 by a screw 259, the end portion 224 on the other side X2 of the second bus bar 22 in the first direction X extending in the second direction Y, and the fourth bus bar 24 A sixth bus bar 26 connected to the end 244 on the other side X2 in the one direction X by a screw 269 is provided. Accordingly, the fifth bus bar 25 is connected to the end portions of the first bus bar 21 and the third bus bar 23 on the same side in the first direction X, and the sixth bus bar 26 is the first of the second bus bar 22 and the fourth bus bar 24. It is connected to the end portion on the same side in the direction X. In this embodiment, the end portion 214 of the first bus bar 21, the end portion 224 of the second bus bar 22, the end portion 234 of the third bus bar 23, and the end portion 244 of the fourth bus bar 24 are the first plate portions 211, 221, 231 and 241 are connected to the fifth bus bar 25 and the sixth bus bar 26 at the same height as the opposite edge of the substrate 10.

  Here, the first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24 are arranged in such a manner that the second bus bar 22, the first bus bar 21, The third bus bar 23 and the fourth bus bar 24 are provided in this order. For this reason, the field effect transistors 121 of the first motor driving circuit 11A and the second motor driving circuit 11B are arranged along the second bus bar 22, and the field effects of the third motor driving circuit 11C and the fourth motor driving circuit 11D. The type transistors 121 are arranged along the fourth bus bar 24.

Further, in plan view as viewed from the third direction Z, the second plate portion 222 of the second bus bar 22 overlaps the first plate portion 211 of the first bus bar 21 on the substrate 10 side, and the second plate portion of the third bus bar 23. 2
32 overlaps the first plate portion 241 of the fourth bus bar 24 on the substrate 10 side.

  Further, the second bus bar 22, the first bus bar 21, the third bus bar 23, and the fourth bus bar 24 are provided in this order from the one side Y1 to the other side Y2 in the second direction Y, and the first bus bar 21 and the third bus bar are provided. 23 is located on the other side X2 in the first direction X by a predetermined distance from the second bus bar 22 and the fourth bus bar 24. Therefore, the fifth bus bar 25 and the sixth bus bar 26 are three-dimensionally crossed and extend in the second direction Y as shown in FIGS. 3 and 7.

  In realizing such a configuration, as shown in FIG. 6, the fifth bus bar 25 is connected to the first connecting portion 251 connected to the end portion 214 of the first bus bar 21 and the end portion 234 of the third bus bar 23. Each of the second connecting portions 252 extends in the second direction Y, and the end portion of the first connecting portion 251 on the one side Y1 in the second direction Y and the other end Y2 of the second connecting portion 252 in the second direction Y. Are connected by a third connecting portion 253 extending in the first direction.

  On the other hand, in the sixth bus bar 26, the first vertical portion 262 bent toward the other side Z 2 in the third direction Z from the connecting portion 261 connected to the end portion 224 of the second bus bar 22, and the end of the fourth bus bar 24. A second vertical portion 266 that is bent from the connecting portion 267 connected to the portion 244 toward the other side Z2 in the third direction Z, and an end portion of the first vertical portion 262 on the other side Z2 in the third direction Z. And the end of the second vertical portion 266 on the other side Z2 in the third direction Z are connected via a connecting portion 268. Here, the connecting portion 268 includes a first horizontal portion 263 that extends from an end portion on the other side Z2 in the third direction Z of the first vertical portion 262 to one side Y1 in the second direction Y, and a second vertical portion 266. A second horizontal portion 265 extending from the end portion of the other side Z2 of the third direction Z to the other side Y2 of the second direction Y, and a connecting portion 264 extending in the first direction X, The first horizontal part 263 and the second horizontal part 265 are connected via a connecting part 264. In the sixth bus bar 26, since the connecting portion 268 is located on the other side Z2 in the Z direction from the fifth bus bar 25 (on the side opposite to the substrate 10), the three-dimensional intersection shown in FIGS. 2 and 7 is possible. .

(Main effects of this form)
As described above, in the motor drive device 100 of the present embodiment, the first motor drive circuit 11A that drives the first motor 1A and the third motor 1C on the one surface of the substrate 10 at the same timing as the first motor 1A. A third motor drive circuit 11C to be driven is provided at a diagonal position, and the second motor drive circuit 11B that drives the second motor 1B at a time that does not overlap the first motor 1A and the second motor 1B at the same timing as the second motor 1B. A fourth motor drive circuit 11D for driving the 4 motor 1D is provided at a diagonal position. For this reason, even if the field effect transistor 121 generates heat in the motor driving circuit, the first motor driving circuit 11A, the second motor driving circuit 11B, the third motor driving circuit 11C, and the fourth motor driving circuit 11D are provided. It is possible to suppress the temperature difference in each region. Accordingly, the first motor 1A and the third motor 1C can be driven in a balanced manner, and the second motor 1B and the fourth motor 1D can be driven in a balanced manner. Therefore, each of the first member 2A and the second member 2B can be driven appropriately.

The board 10 is provided with a bus bar 20 for supplying power to the first motor drive circuit 11A, the second motor drive circuit 11B, the third motor drive circuit 11C, and the fourth motor drive circuit 11D. Current can be supplied to the motor drive circuit. The bus bar 20 (the first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24) was stopped from the opposite side of the bus bar 20 through the through hole 101 provided in the substrate 10. It is fixed to the substrate 10 with screws 209. For this reason, it is not necessary to fix the bus bar 20 with solder. Therefore, the bus bar 20 can be reliably and efficiently fixed to the substrate 10 without being hindered by the heat capacity and heat dissipation of the bus bar 20. Further, the board 10 is not warped by heat when the bus bar 20 is fixed to the board 10 by soldering. Therefore, the bus bar 20 can be appropriately provided on the substrate 10.

  The first bus bar 21 and the second bus bar 22 are electrically connected to two motor drive circuits (the first motor drive circuit 11A and the second motor drive circuit 1B), and the third bus bar 23 and the fourth bus bar 24 are Although electrically connected to the two motor drive circuits (the third motor drive circuit 11C and the fourth motor drive circuit 11D), the first motor drive circuit 11A and the second motor drive circuit 11B do not overlap each other. The third motor drive circuit 11C and the fourth motor drive circuit 11D operate at a timing that does not overlap. For this reason, the electric current which flows through each bus-bar 20 can be restrained small, for example to about 50A / 2. Therefore, even when the common bus bar 20 is provided in the two drive circuits, the allowable current value of the bus bar 20 is not exceeded, and heat generation in the bus bar 20 can be suppressed.

  In addition, the first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24 are respectively provided with first plate portions 211, 221, 231, and 241 arranged perpendicular to the substrate 10, and the substrate 10. Since the second plate portions 212, 222, 232, and 242 are provided in parallel with each other, the second plate portions 212, 222, 232, and 242 can be easily fixed to the substrate 10 with the screws 209. In addition, since the first plate portions 211, 221, 231, and 241 are perpendicular to the substrate 10, the first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24 are arranged on the substrate 10. The area for this is small. In a plan view as viewed from the third direction Z, the second plate portion 222 of the second bus bar 22 overlaps the first plate portion 211 of the first bus bar 21, and the second plate portion 232 of the third bus bar 23 is It overlaps with the first plate part 241 of the four bus bars 24. For this reason, the area for arranging the first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24 on the substrate 10 can be reduced.

  Further, since a fifth bus bar 25 connected to the first bus bar 21 and the third bus bar 23 and a sixth bus bar 26 connected to the second bus bar 22 and the fourth bus bar 24 are provided, the fifth bus bar 25 is provided. A potential can be applied to the first bus bar 21 and the third bus bar 23 via the bus bar 25, and a potential can be applied to the second bus bar 22 and the fourth bus bar 24 via the sixth bus bar 26. Therefore, it is easy to supply a potential to the first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24. Moreover, the fifth bus bar 25 is connected to the end portions 214 and 234 on the same side (the other side X2) in the first direction X of the first bus bar 21 and the third bus bar 23, and the sixth bus bar 26 is connected to the second bus bar 22. The fourth bus bar 24 is connected to end portions 224 and 244 on the same side (the other side X2) in the first direction X. For this reason, wiring to the fifth bus bar 25 and the sixth bus bar 26 is easy. Further, the fifth bus bar 25 and the sixth bus bar 26 intersect three-dimensionally. For this reason, since the fifth bus bar 25 and the sixth bus bar 26 do not have to be routed long, the fifth bus bar 25 and the sixth bus bar 26 can be shortened.

(Detailed configuration of second configuration example of motor driving device 100)
FIG. 8 is a perspective view showing a configuration of one surface side of the substrate 10 of the second configuration example of the motor driving apparatus 100 to which the present invention is applied. FIG. 9 is a plan view of the substrate 10 shown in FIG. FIG. 10 is an exploded perspective view of the substrate 10 shown in FIG. 8 with the fifth bus bar 25 and the sixth bus bar 26 removed. FIG. 11 is an exploded perspective view in a state where all the bus bars are removed from the substrate 10 shown in FIG. 12 is a perspective view of the substrate 10 shown in FIG. 8 as viewed from the other side X2 in the first direction X. As shown in FIG. In addition, since the basic structure of this form is common with the form demonstrated with reference to FIGS. 3-7, the same code | symbol is attached | subjected about a common part and those detailed description is abbreviate | omitted.

As shown in FIGS. 8, 9, 10, 11, and 12, the motor driving device 100 of this embodiment is also described on one side of the substrate 10 with reference to FIG. A motor drive circuit is provided. Here, on one side of the substrate 10, the first motor drive circuit 11A and the third
The motor drive circuit 11C is positioned diagonally, and the second motor drive circuit 11B and the fourth motor drive circuit 11D are positioned diagonally. A plurality of bus bars 20 (first bus bars) for supplying power to the first motor drive circuit 11A, the second motor drive circuit 11B, the third motor drive circuit 11C, and the fourth motor drive circuit 11D are provided on one side of the substrate 10. 21, second bus bar 22, third bus bar 23 and fourth bus bar 24). Also in this embodiment, as in the configuration example 1, the first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24 are made of metal members having the same shape and size. The first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24 are respectively provided with first plate portions 211, 221, 231, and 241 arranged perpendicular to the substrate 10, and the plate portions. This is a plate-like member provided with a plurality of second plate portions 212, 222, 232, and 242 that are bent at the end of the plate and parallel to the substrate 10. The first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24 are respectively connected to the first bus bar 21, the second bus bar 22, and the third bus bar through through holes (not shown) provided in the substrate 10. The bus bar 23 and the fourth bus bar 24 are fixed to the substrate 10 by screws (not shown) fixed to the second plate portions 212, 222, 232, and 242 from the opposite side.

  The first bus bar 21 and the third bus bar 23 are located on the other side X2 in the first direction X by a predetermined distance from the second bus bar 22 and the fourth bus bar 24. However, the first bus bar 21 and the third bus bar 23 are provided at the same position in the first direction X, and the second bus bar 22 and the fourth bus bar 24 are provided at the same position in the first direction X.

  On one side of the substrate 10, the end 214 on the other side X <b> 2 in the first direction X of the first bus bar 21 and the other side X <b> 2 in the first direction X of the third bus bar 23 extend in the second direction Y. The fifth bus bar 25 connected to the end portion 234 by a screw 259, the end portion 224 on the other side X2 of the second bus bar 22 in the first direction X extending in the second direction Y, and the fourth bus bar 24 A sixth bus bar 26 connected to the end 244 on the other side X2 in the one direction X by a screw 269 is provided.

  Here, the first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24 are arranged in such a manner that the second bus bar 22, the first bus bar 21, The fourth bus bar 24 and the third bus bar 23 are provided in this order. For this reason, the fifth bus bar 25 and the sixth bus bar 26 extend in the second direction Y in parallel in the first direction X. For this reason, the fifth bus bar 25 is a plate extending linearly in the second direction Y, and the sixth bus bar 26 is a plate extending linearly in the second direction Y, similarly to the fifth bus bar 25. Is.

  In this embodiment, the fuse 19 is provided between the power taps 27 and 28, and the power tap 27 and the fifth bus bar 25 are connected by the bus bar 29. Accordingly, power is supplied to the first bus bar 21 and the third bus bar 23 via the fuse 19.

  Even in the motor drive device 100 configured as described above, similarly to the configuration example 1, even if the field effect transistor generates heat in the motor drive circuit described above, the first motor drive circuit 11A, the second motor drive circuit 11B, and the third motor The temperature difference in each region where the drive circuit 11C and the fourth motor drive circuit 11D are provided can be suppressed. Further, since the bus bar 20 (the first bus bar 21, the second bus bar 22, the third bus bar 23, and the fourth bus bar 24) is fixed to the substrate 10 with screws, it is not necessary to fix the bus bar 20 with solder. Therefore, the same effect as that of the configuration example 1 can be obtained, for example, the bus bar 20 can be reliably and efficiently fixed to the substrate 10 without being hindered by the heat capacity and heat dissipation of the bus bar 20.

(Other configuration examples)
In the configuration examples 1 and 2 described above, the field effect transistor 121 and the bus bar 20 are separated from each other. However, the heat dissipation plate of the field effect transistor 121 may be in contact with the bus bar 20. According to this configuration, the heat generated in the field effect transistor 121 can be released via the bus bar 20.

DESCRIPTION OF SYMBOLS 1A ... 1st motor, 1B ... 2nd motor, 1C ... 3rd motor, 1D ... 4th motor, 2A ... 1st member, 2B ... 2nd member, 10 ... Board | substrate, 11A ... 1st motor drive circuit, 11B ... 2nd motor drive circuit, 11C ... 3rd motor drive circuit, 11D ... 4th motor drive circuit, 20 ... Bus bar, 21 ... 1st bus bar, 22 ... 2nd bus bar, 23 ... 3rd bus bar, 24 ... 4th bus bar, 25 ... 5th bus bar, 26 ... 6th bus bar, 70 ... case, 71 ... heat sink, 100 ... motor drive device, 101 ... through hole, 121 ... field effect transistor, 211,221, 231,241 ... first plate part , 212, 222, 232, 242 ... second plate portion

Claims (10)

A substrate,
A first motor driving circuit which is provided on one surface of the substrate and drives the first motor;
A second motor driving circuit which is provided at a position adjacent to the first motor driving circuit on one side in the first direction on one side of the substrate and which drives the second motor at a time not overlapping with the first motor; ,
Provided on one side of the substrate adjacent to the second motor drive circuit on one side in the second direction intersecting the first direction, and drives the third motor at the same timing as the first motor. A third motor drive circuit;
A fourth motor driving circuit provided at a position adjacent to one side of the second direction with respect to the first motor driving circuit on one side of the substrate and driving the fourth motor at the same timing as the second motor; ,
A motor drive device comprising:   The plurality of field effect transistors are provided in each of the first motor drive circuit, the second motor drive circuit, the third motor drive circuit, and the fourth motor drive circuit. The motor drive device according to 1.   A bus bar for supplying power to the first motor drive circuit, the second motor drive circuit, the third motor drive circuit, and the fourth motor drive circuit is provided on one surface side of the substrate. The motor drive device according to claim 1 or 2. On one side of the substrate, as the bus bar,
A first bus bar extending in the first direction and electrically connected to the first motor drive circuit and the second motor drive circuit;
A potential different from that of the first bus bar is applied, and extends in the first direction at a position adjacent to the first bus bar on one side or the other side in the second direction. A second bus bar electrically connected to the second motor drive circuit;
A third bus bar extending in the first direction on one side in the second direction from the first bus bar and the second bus bar and electrically connected to the third motor drive circuit and the fourth motor drive circuit When,
A position to which a potential different from that of the third bus bar is applied and is adjacent to the third bus bar on one side or the other side in the second direction from the first bus bar and the second bus bar on the one side in the second direction. A fourth bus bar extending in the first direction and electrically connected to the third motor driving circuit and the fourth motor driving circuit;
The motor drive device according to claim 3, wherein the motor drive device is provided. A fifth bus bar extending in the second direction and connected to an end of the first bus bar and an end of the third bus bar;
A sixth bus bar extending in the second direction and connected to an end of the second bus bar and an end of the fourth bus bar;
The motor drive device according to claim 4, wherein The fifth bus bar is connected to end portions on the same side in the first direction of the first bus bar and the third bus bar,
6. The motor drive device according to claim 5, wherein the sixth bus bar is connected to end portions on the same side in the first direction of the second bus bar and the fourth bus bar. The first bus bar, the second bus bar, the third bus bar, and the fourth bus bar are arranged from one side of the second direction to the other side, the second bus bar, the first bus bar, the third bus bar, and Provided in the order of the fourth bus bar,
The motor driving device according to claim 6, wherein the fifth bus bar and the sixth bus bar cross in a three-dimensional manner and extend in the second direction. The first bus bar, the second bus bar, the third bus bar, and the fourth bus bar are arranged from one side of the second direction to the other side, the second bus bar, the first bus bar, the fourth bus bar, and Provided in the order of the third bus bar,
The motor drive device according to claim 6, wherein the fifth bus bar and the sixth bus bar extend in the second direction in parallel in the first direction.   The motor according to any one of claims 4 to 8, wherein the first bus bar, the second bus bar, the third bus bar, and the fourth bus bar are made of metal members having the same shape and size. Drive device.   The motor driving device according to claim 1, wherein the substrate is accommodated in a case having a heat sink.

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