Motor control device

Abstract

To provide a motor control device that is able to prevent fluctuation in a separation distance between an electrode to be detected and a magnetic detection element.SOLUTION: A motor control device includes a base block 20, a support post portion 13A, a substrate, an electrode for energization, and a magnetic detection element. At least a part of a power control circuit is disposed in the base block 20. The support post portion 13A is provided on the base block 20 so as to project therefrom. The substrate is fixed to the base block 20 via the support post portion 13A. The electrode for energization is connected to the power control circuit. The magnetic detection element is mounted in a position close to an electrode of the substrate and detects a magnetic field caused by a current flowing through the electrode. The magnetic detection element is disposed in the vicinity of a support portion of the support post portion 13A at an end part of the substrate in an extending direction thereof.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a motor control device. [Background technology]

[0002] There is a known motor control device that converts DC power supplied from a battery into AC power and drives a motor with the converted AC power. This type of motor control device needs to accurately detect the input current value from the battery and the output current value to the motor, and control each part based on these detected current values. As a countermeasure to this, there is known a device in which a current sensor is installed around a current-carrying electrode (bus bar) connected to a power control circuit (see, for example, Patent Document 1).

[0003] The current sensor described in Patent Document 1 has a magnetic core and a Hall element (magnetic detection element) arranged around a current-carrying electrode (bus bar) connected to a power control circuit. This current sensor uses the magnetic core to amplify the magnetic field generated by the current flowing through the bus bar, and the Hall element detects the magnetic field amplified by the magnetic core. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2012-37298 A Summary of the Invention [Problem to be solved by the invention]

[0005] The current sensor described in Patent Document 1 has a structure in which a magnetic core and a Hall element are arranged around a current-carrying electrode (bus bar), so the provision of the magnetic core increases the size of the entire device and increases manufacturing costs.

[0006] As a countermeasure, in recent years, a method has been considered for detecting the magnetic field generated around the electrode using only a magnetic detection element such as a Hall element, without providing a magnetic core. However, in this case, even if the magnetic detection element is brought close enough to the electrode, the detected current value fluctuates significantly due to a slight change in the distance between the magnetic detection element and the electrode. For this reason, when the motor control device is used in equipment that is expected to be subjected to large vibration input, such as a vehicle, there is a concern that the detection accuracy of the current flowing through the electrode will decrease.

[0007] SUMMARY OF THE PRESENT EMBODIMENTS The present invention provides a motor control device that can suppress variations in the distance between the electrode, which is the detection target, and the magnetic detection element. [Means for solving the problem]

[0008] In order to solve the above problems, a motor control device according to the present invention employs the following configuration. That is, the motor control device of the first aspect of the present invention comprises a base block on which at least a part of a power control circuit is arranged, a support portion protruding from the base block, a substrate fixed to the base block via the support portion, an electrode for supplying current connected to the power control circuit, and a magnetic detection element attached to a position close to the electrode on the substrate and detecting a magnetic field caused by a current flowing through the electrode, wherein the magnetic detection element is arranged in the vicinity of a support portion provided by the support portion at an end of the substrate in the extension direction.

[0009] In the motor control device of this configuration, the end of the substrate in the extension direction is supported by the base block via the support column. When vibration is input from the outside, the amplitude of the central region of the substrate tends to become large. In contrast, the support column at the end of the substrate in the extension direction is likely to have vibrations suppressed by the support column, and does not vibrate with a large amplitude even when vibration is input from the outside. Therefore, the magnetic detection element arranged near the support column at the end of the substrate in the extension direction does not vibrate significantly in response to external vibration input. Therefore, when this configuration is adopted, fluctuations in the separation distance between the electrode and the magnetic detection element are suppressed.

[0010] A second aspect of the motor control device of the present invention is the motor control device of the first aspect, wherein the electrode is formed of a plate-shaped bus bar fixed to the base block, and a bent portion is provided in a part of the bus bar that is bent so as to be close to the magnetic detection element.

[0011] In this case, even if the distance between the fixed portion of the busbar and the substrate is large, it is possible to sufficiently narrow the distance between the busbar (electrode) that is the detection target and the magnetic detection element by bringing the bent portion of the busbar closer to the substrate.

[0012] A third aspect of the motor control device of the present invention is a motor control device of the first or second aspect, in which a plurality of the electrodes are provided, a plurality of the magnetic detection elements are provided in a horizontal row along one edge of the substrate in the extension direction, and the one edge of the substrate is fixed to the base block via a plurality of the support portions.

[0013] In this case, the one edge of the substrate is supported by the base block through the multiple support columns, which increases the rigidity of the one edge of the substrate. The multiple magnetic detection elements are arranged in a row horizontally along the one edge of the second substrate having increased rigidity in this manner, which effectively reduces variations in the distance between the multiple electrodes and the multiple magnetic detection elements corresponding to them.

[0014] A fourth aspect of the motor control device of the present invention is the motor control device of the third aspect, wherein the electrodes include a pair of battery side bus bars connected to a battery and three motor side bus bars connected to a three-phase power supply unit of the motor, the battery side bus bars are each arranged on the outside of the three motor side bus bars arranged horizontally in the arrangement direction, and the magnetic detection element is arranged at a position close to one of the battery side bus bars and a position close to each of the three motor side bus bars on the outside in the arrangement direction.

[0015] In this case, the input current from the battery can be detected by a magnetic detection element arranged close to one of the battery side bus bars. The output current of two phases of the motor's three-phase output current can be detected by two magnetic detection elements arranged close to the two outermost motor side bus bars in the arrangement direction. In addition, the output current of the remaining one phase of the motor's three-phase output current can be calculated based on the detection value by the two magnetic detection elements arranged close to the two outermost motor side bus bars in the arrangement direction. Therefore, when this configuration is adopted, the input current and the output current can be reliably detected by the minimum number of magnetic detection elements required. Therefore, when this configuration is adopted, the current detection unit can be made smaller and lighter.

[0016] A fifth aspect of the motor control device of the present invention is the motor control device of the fourth aspect, wherein the support portion is arranged at an approximately midpoint between one motor side bus bar on the outside in the arrangement direction and one of the battery side bus bars adjacent to the motor side bus bar, and at an approximately midpoint between another motor side bus bar on the outside in the arrangement direction and the other battery side bus bar adjacent to the motor side bus bar.

[0017] In this case, the two support columns supporting one edge of the substrate can efficiently suppress fluctuations in the magnetic detection element for detecting the input current and the magnetic detection element for detecting the output current. Therefore, when this configuration is adopted, the number of support columns protruding from the base block can be reduced while still ensuring sufficient support rigidity for the substrate, thereby making the entire device even smaller and lighter. Effect of the Invention

[0018] In the motor control device of the present invention, the magnetic detection element is positioned near the support part formed by the pillar part at the end of the extension direction of the substrate, so that fluctuations in the distance between the electrode and the magnetic detection element can be suppressed even if vibration input is applied from outside. [Brief description of the drawings]

[0019] [Figure 1] FIG. 2 is a perspective view of the motor control device according to the embodiment with the upper cover removed. [Diagram 2] 2 is a perspective view of the motor control device according to the embodiment with a second substrate removed from FIG. 1; [Diagram 3] 3 is a front view of the motor control device according to the embodiment, corresponding to the view seen from the arrow III in FIG. 1; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0021] Fig. 1 is a perspective view of the motor control device 1 of this embodiment with the upper cover removed. Fig. 2 is a perspective view of the motor control device 1 with the second board 14 (board) removed from Fig. 1. Fig. 3 is a front view of the motor control device 1 corresponding to the view of the arrow III in Fig. 1. The motor control device 1 has an inverter function that converts DC power supplied from a battery (not shown) into AC power and drives a motor (not shown) (AC motor) with the converted AC power. The motor control device 1 has a thin rectangular parallelepiped case 10 with one side open. A plurality of fins 10a for heat dissipation are protrudingly provided on the outer side of the case 10. For ease of explanation, the side of the case 10 with the opening thereon will be referred to as the "upper" side, and the opposite side will be referred to as the "lower" side.

[0022] A first substrate 11 and a plurality of electrolytic capacitors 12 (see FIG. 2) are housed and arranged inside the opening of the case 10. In addition, a plurality of support pillars 13A, 13B, and 13C are protruding from the case 10 so as to protrude upward. A second substrate 14 is supported on the upper portions of the support pillars 13A, 13B, and 13C. The second substrate 14 is arranged above the first substrate 11 and the plurality of electrolytic capacitors 12 so as to be approximately parallel to the first substrate 11. As shown in FIG. 2, the first substrate 11 is housed and arranged near one side inside the case 10, which is approximately rectangular in plan view, and the plurality of electrolytic capacitors 12 are housed and arranged near the other side inside the case 10. In addition, an upper cover (not shown) is attached to the upper portion of the case 10 to cover the first substrate 11, the electrolytic capacitor 12, the second substrate 14, and the like.

[0023] The first substrate 11 is a printed circuit board (PWB) on which multiple electronic components including switching elements 15 are mounted. A plurality of switching elements 15 are combined together to form a main part of a power control circuit 16 together with the electrolytic capacitor 12. The power control circuit 16 performs ON / OFF operation by controlling the switching elements 15 by a control unit (not shown), thereby converting the DC power of the battery into three-phase AC power.

[0024] A pair of battery side bus bars 17A, 17B, which are electrodes for supplying current to the battery, and three motor side bus bars 18A, 18B, 18C, which are electrodes for supplying current to the motor, are connected to the power control circuit 16. The pair of battery side bus bars 17A, 17B can be connected to the positive and negative poles of the battery via connection cables (not shown). The three motor side bus bars 18A, 18B, 18C can be connected to the power supply parts of the U-phase, V-phase, and W-phase of the motor via connection cables (not shown).

[0025] 2, electrolytic capacitor 12 disposed near the other side within case 10 is formed in a substantially cylindrical shape. These multiple electrolytic capacitors 12 are disposed in parallel in a direction perpendicular to the longitudinal direction (axial direction). Multiple electrolytic capacitors 12 are connected to a circuit on first substrate 11 via connection bus bars 19A, 19B that are surface-mounted on first substrate 11. In this embodiment, case 10, first substrate 11 supported by case 10, and electrolytic capacitor 12 form a main portion of base block 20. Hereinafter, the direction along the longitudinal direction (axial direction) of electrolytic capacitor 12 will be referred to as the X direction. The direction in which electrolytic capacitors 12 are arranged in parallel will be referred to as the Y direction, and the direction perpendicular to the X and Y directions will be referred to as the Z direction. Arrows indicating the X direction, Y direction, and Z direction are indicated at appropriate positions in the drawings.

[0026] A positive circuit terminal and a negative circuit terminal (not shown), which are power input units from a battery, are mounted on the upper surface of the first substrate 11. These circuit terminals are disposed near both ends in the Y direction of the first substrate 11. Battery side bus bars 17A and 17B, which are electrodes for passing current, are connected to the positive circuit terminal and the negative circuit terminal on the first substrate 11, respectively.

[0027] Each of the battery side busbars 17A and 17B is formed by bending a long conductive metal plate in a hat shape in the longitudinal direction. One end of each of the battery side busbars 17A and 17B in the longitudinal direction is a terminal fixing portion 17Aa or 17Ba attached to the upper surface of one end of the case 10 in the X direction, and the other end is a circuit fixing portion 17Ab or 17Bb connected to the positive circuit terminal and the negative circuit terminal on the first board 11. The central region in the longitudinal direction of each of the battery side busbars 17A and 17B is a bent portion 17Ac or 17Bc bent upward in a substantially U-shape. The terminal fixing portions 17Aa or 17Ba and the circuit fixing portions 17Ab or 17Bb of the battery side busbars 17A and 17B are fixed to the case 10 and the first board 11 so that the longitudinal direction of the battery side busbars 17A and 17B is aligned with the X direction.

[0028] In addition, three output circuit terminals (not shown) for U-phase, V-phase, and W-phase, which are power output sections to the motor, are mounted on the upper surface of the first substrate 11. These output circuit terminals are arranged in the central region of the first substrate in the Y-direction and spaced apart approximately evenly in the Y-direction. Motor side bus bars 18A, 18B, and 18C, which are electrodes for passing current, are connected to the output circuit terminals, respectively.

[0029] The motor-side busbars 18A, 18B, 18C are formed by bending a long conductive metal plate in the longitudinal direction into a hat shape, similar to the battery-side busbars 17A, 17B. One longitudinal end of each of the motor-side busbars 18A, 18B, 18C is a terminal fixing portion 18Aa, 18Ba, 18Ca attached to the upper surface of one end in the X direction of the case 10, and the other longitudinal end is a circuit fixing portion 18Ab, 18Bb, 18Cb connected to each of the output-side circuit terminals on the first substrate 11. The longitudinal center region of each of the motor-side busbars 18A, 18B, 18C is a bending portion 18Ac, 18Bc, 18Cc bent upward into a substantially U-shape. Motor side bus bars 18A, 18B, 18C have terminal fixing portions 18Aa, 18Ba, 18Ca and circuit fixing portions 18Ab, 18Bb, 18Cb fixed to case 10 and first board 11 such that the longitudinal direction is along the X direction.

[0030] The three motor side bus bars 18A, 18B, 18C are arranged in a row side by side along the Y direction. The three motor side bus bars 18A, 18B, 18C are arranged at equal intervals in the Y direction. One battery side bus bar 17A is arranged adjacent to the outer side of one end side of the three motor side bus bars 18A, 18B, 18C in the arrangement direction, and the other battery side bus bar 17B is arranged adjacent to the outer side of the other end side of the three motor side bus bars 18A, 18B, 18C in the arrangement direction. Therefore, the pair of battery side bus bars 17A, 17B and the three motor side bus bars 18A, 18B, 18C are arranged in a row side by side along the Y direction. Terminal fixing portions 17Aa, 17Ba, 18Aa, 18Ba, 18Ca of battery side bus bars 17A, 17B and motor side bus bars 18A, 18B, 18C are arranged in a row along the Y direction at one end side of case 10 in the X direction.

[0031] The second substrate 14 is a printed circuit board (PWB) on which electronic components are mounted. The circuit printed on the second substrate 14 is connected to the circuit on the first substrate 11 via an inter-substrate connector 21 (see FIG. 2). In addition, a signal connector 22 is held between the case 10 and an upper cover (not shown). A plurality of signal terminals protruding from the signal connector 22 are also connected to the circuit on the second substrate 14.

[0032] The second substrate 14 is formed in a substantially rectangular shape as shown in FIG. 1. One edge of the second substrate 14 in the X direction is fixed to the case 10 (base block 20) ​​via a pair of support pillars 13A protruding from the case 10. The pair of support pillars 13A are disposed spaced apart in the Y direction, and each penetrates the second substrate 14 in the up-down direction. One edge of the second substrate 14 in the X direction is placed on the upper surface of each support pillar 13A. In this state, the one edge of the second substrate 14 in the X direction is fastened and fixed to the upper end of each support pillar 13A by a fixing screw 45.

[0033] The other side in the X direction of second substrate 14 is fixed to case 10 via two pairs of support columns 13B, 13C protruding from case 10. The other edge of second substrate 14 in the X direction is placed on the upper surface of the pair of support columns 13C and, in this state, is fixed to the upper end of each support column 13C by fixing screws 46. In addition, another pair of support columns 13B penetrate second substrate 14 in the up-down direction and are fitted into fitting holes 23 of second substrate 14 in this state.

[0034] Three Hall ICs 40, each of which has a built-in Hall element that is a magnetic detection element, are attached to the underside of the second substrate 14 near one side in the X direction (the end in the extending direction). One Hall IC 40 is disposed below the second substrate 14 so as to face the bent portion 17Ac of one of the battery side busbars 17A (for example, the busbar on the positive pole side). This Hall IC 40 faces the upper surface of the bent portion 17Ac of the battery side busbar 17A with a small gap therebetween. This Hall IC 40 detects a magnetic force generated due to a direct current of the battery when the current flows through the battery side busbar 17A. The detection circuit determines the value of the current flowing through the battery side busbar 17A based on the detected magnetic force.

[0035] The other Hall IC 40 is disposed below the second substrate 14 so as to face the bent portion 18Ac of the motor-side busbar 18A at one end in the arrangement direction. This Hall IC 40 faces the upper surface of the bent portion 18Ac of the motor-side busbar 18A with a small gap therebetween. When an AC current flows from the power control circuit 16 to the motor-side busbar 18A, this Hall IC 40 detects a magnetic force generated due to the current. The detection circuit determines the value of the current flowing through the motor-side busbar 18A based on the detected magnetic force.

[0036] The remaining Hall IC 40 is disposed below the second substrate 14 so as to face the bent portion 18Cc of the motor-side busbar 18C at the other end in the arrangement direction. This Hall IC 40 faces the upper surface of the bent portion 18Cc of the motor-side busbar 18C with a small gap therebetween. When an AC current flows from the power control circuit 16 to the motor-side busbar 18C, this Hall IC 40 detects a magnetic force generated due to the current. The detection circuit determines the value of the current flowing through the motor-side busbar 18C based on the detected magnetic force.

[0037] In this embodiment, there is no Hall IC 40 for detecting the current flowing through the central motor-side bus bar 18B. The current value of the current flowing through the central motor-side bus bar 18B is calculated based on the detection values ​​of the currents flowing through the motor-side bus bars 18A and 18C on both sides. In addition, a magnetic shield member 50 such as permalloy is attached around the bent portion 18Bc of the central motor-side bus bar 18B. This magnetic shield member 50 is intended to prevent the detection result of the Hall IC 40 from being affected by the magnetic field caused by the current flowing through the central motor-side bus bar 18B.

[0038] In this embodiment, the Hall IC 40 in which the Hall element and the amplifier circuit are packaged is used, but the Hall element and the amplifier circuit may be configured separately. In this case, at least the Hall element is disposed close to the corresponding bus bar. The magnetic detection element is not limited to the Hall element. The magnetic detection element may be any other element that can detect a magnetic field caused by a current flowing through the corresponding bus bar (electrode).

[0039] Here, the installation portions of the three Hall ICs 40 are all disposed near the support portions 14a of the support pillars 13A on the edge (end in the extension direction) of the second substrate 14. In the present embodiment, the support portions 14a on the edge of the second substrate 14 are formed by clamping portions between the upper end faces of the support pillars 13A and the heads of the fixing screws 45. The three Hall ICs 40 disposed on the edge of the second substrate 14 are disposed in a row horizontally along the edge (along the Y direction).

[0040] The positional relationship of each support portion 13A with respect to the bus bar is as follows. One of the support pillars 13A is disposed at a substantially midpoint between the motor-side busbar 18A at one end in the arrangement direction and one of the battery-side busbars 17A adjacent to the motor-side busbar 18A. Therefore, the Hall IC 40 disposed facing the upper surface of the bent portion 18Ac of the motor-side busbar 18A and the Hall IC 40 disposed facing the upper surface of the bent portion 17Ac of the battery-side busbar 17A are located at substantially the same distance from the support portion 14a of the one of the support pillars 13A.

[0041] The other support column 13A is disposed at a substantially midway position between the motor-side busbar 18C at the other end in the arrangement direction and the other battery-side busbar 17B adjacent to the motor-side busbar 18C. The distance from the Hall IC 40 disposed opposite to the upper surface of the bent portion 18Cc of the motor-side busbar 18C to the support portion 14a of the other support column 13A is substantially equal to the distance from the Hall IC 40 on the motor-side busbar 18A side to the support portion 14a of the one support column 13A.

[0042] These distances (the distance from each support portion 14a to the adjacent Hall IC 40) are set so that the vibration amplitude of the installation portion of the Hall IC 40 falls within an allowable range when vibration is input from the outside. Here, the "allowable range" means that the detection value of the magnetic field (current) by the Hall IC 40 falls within an allowable error range. In this embodiment, the input vibration from the outside is assumed to be input vibration when the motor control device 1 is mounted on a vehicle.

[0043] (Effects of the embodiment) As described above, in the motor control device 1 of this embodiment, the Hall IC 40 (magnetic detection element) is disposed near the support portion 14a formed by the support portion 13A at the end portion in the extension direction of the second substrate 14. Therefore, in the motor control device 1 of this embodiment, even if there is an external vibration input, it is possible to suppress fluctuations in the separation distance between the current-carrying electrodes (battery-side bus bar 17A and motor-side bus bars 18A, 18C) and the Hall IC 40 (magnetic detection element).

[0044] That is, the amplitude of the second substrate 14 in the central region is likely to become large when vibration is input from the outside, but the end portion in the extension direction of the second substrate 14 supported by the support portion 13A does not vibrate with a large amplitude even when vibration is input from the outside. Therefore, the Hall IC 40 (magnetic detection element) arranged near the support portion 14a by the support portion 13A at the end portion in the extension direction of the second substrate 14 does not vibrate greatly when vibration is input from the outside. Therefore, the motor control device 1 of this embodiment can suppress the fluctuation of the separation distance between the current-carrying electrode (bus bar) and the Hall IC 40 (magnetic detection element) even when vibration is input from the outside.

[0045] Therefore, when the motor control device of this embodiment is adopted, it is possible to stably improve the detection accuracy of the current flowing through the electrodes (busbars). This makes it possible to contribute to Goal 7 "Ensure access to affordable, reliable, sustainable and modern energy for all" and Goal 8 "Promote sustained, inclusive and sustainable economic growth, full productive employment and decent work for all" of the Sustainable Development Goals (SDGs) led by the United Nations.

[0046] Furthermore, in the motor control device 1 of this embodiment, the busbars (battery side busbar 17A, motor side busbars 18A, 18C) that are electrodes for current flow are provided with bent portions 17Ac, 18Ac, 18Cc so as to be close to the Hall IC 40 on the second substrate 14 side. Therefore, even if the distance between the fixed portion of the busbar and the second substrate 14 is large, the distance between the busbar (electrode) to be detected and the Hall IC 40 can be sufficiently narrowed by bringing the bent portions 17Ac, 18Ac, 18Cc provided on the busbars close to the second substrate 14 side. Therefore, when this configuration is adopted, the detection accuracy of the Hall IC 40 can be further improved.

[0047] Furthermore, in the motor control device 1 of this embodiment, the multiple Hall ICs 40 are arranged side by side along one edge of the second substrate 14 in the extension direction, and that edge of the second substrate 14 is fixed to the case 10 (base block 20) ​​via the multiple support pillars 13A. Therefore, the multiple Hall ICs 40 are arranged along one edge of the second substrate 14, the rigidity of which is increased by the multiple support pillars 13A. Therefore, when this configuration is adopted, it is possible to efficiently suppress fluctuations in the separation distance between the multiple Hall ICs 40 and the bus bars (battery side bus bar 17A, motor side bus bars 18A, 18C) facing them.

[0048] Furthermore, in the motor control device 1 of this embodiment, the battery side bus bars 17A and 17B are disposed on the outer side of the three motor side bus bars 18A, 18B, and 18C arranged side by side in the arrangement direction. The Hall ICs 40 are disposed in a position close to one of the battery side bus bars 17A and in a position close to each of the motor side bus bars 18A and 18C on the outer side of the arrangement direction among the three motor side bus bars 18A, 18B, and 18C. Therefore, the input current from the battery can be detected by the Hall IC 40 disposed close to one of the battery side bus bars 17A, and the output current of two phases of the output current of the three phases of the motor can be detected by two Hall ICs 40 disposed close to the two outer side of the arrangement direction of the motor side bus bars 18A, 18B, and 18C. The output current of the remaining one phase of the motor can be calculated based on the detection value by the two Hall ICs 40 disposed close to the two outer motor side bus bars 18A and 18C in the arrangement direction. Therefore, when the motor control device 1 having this configuration is employed, the input current and the output current can be reliably detected by the minimum number of Hall ICs 40. This makes it possible to reduce the size and weight of the current detection section.

[0049] In addition, in the motor control device 1 of this embodiment, one of the support columns 13A is disposed at a substantially intermediate position between one of the motor side bus bars 18A on the outer side in the arrangement direction and one of the battery side bus bars 17A adjacent to the motor side bus bar 18A. The other support column 13A is disposed at a substantially intermediate position between another of the motor side bus bars 18C on the outer side in the arrangement direction and another of the battery side bus bars 17B adjacent to the motor side bus bar 18C. Therefore, the two support columns 13A supporting one edge of the second substrate 14 can efficiently suppress the fluctuations of the Hall IC 40 for detecting the input current and the Hall IC 40 for detecting the output current. Therefore, when this configuration is adopted, the number of support columns 13A protruding from the base block 20 can be reduced while sufficiently securing the support rigidity of the second substrate 14, and the entire device can be further reduced in size and weight.

[0050] The present invention is not limited to the above embodiment, and various design modifications are possible without departing from the spirit of the present invention. For example, in the above embodiment, the magnetic detection elements (Hall ICs 40) are arranged at positions facing the two motor-side bus bars 18A and 18C, respectively, but the magnetic detection elements (Hall ICs 40) may be arranged at positions facing the three motor-side bus bars 18A, 18B, and 18C, respectively.

[0051] In addition, in the above embodiment, the power control circuit 16 is configured by the mounted components and the electrolytic capacitor 12 on the first substrate 11, but a part of the power control circuit 16 may be provided on the second substrate 14.

[0052] In the above embodiment, the current-carrying electrodes are configured by bus bars, but the current-carrying electrodes are not limited to bus bars. The current-carrying electrodes may be, for example, linear or block-shaped, as long as they are capable of conducting electricity.

[0053] Furthermore, in the above embodiment, a pair of support pillars 13A are provided to support the end of the second substrate 14 (substrate) on the side where the Hall IC (magnetic detection element) is provided, but the number of support pillars 13A is not limited to two. The number of support pillars 13A may be three or more, or may be one.

[0054] In the above embodiment, the Hall IC (magnetic detection element) is arranged only at one end (end in the X direction) of the second substrate 14 (substrate) in the extending direction, but the Hall IC (magnetic detection element) can also be arranged at the other end of the second substrate 14 (substrate) in the extending direction. In this case, the Hall IC (magnetic detection element) arranged at the other end of the second substrate 14 (substrate) in the extending direction may be arranged near a support part supported by any of the pillar parts.

[0055] In the above embodiment, the battery side bus bars 17A, 17B and the motor side bus bars 18A, 18B, 18C are provided with the bent portions 17Ac, 17Bc, 18Ac, 18Bc, and 18Cc, respectively. However, if each bus bar can be brought sufficiently close to the corresponding Hall IC (magnetic detection element), the bent portions 17Ac, 17Bc, 18Ac, 18Bc, and 18Cc are not necessarily provided. [Explanation of symbols]

[0056] 1...motor control device, 10...case, 10a...fin, 11...first board, 12...electrolytic capacitor, 12...capacitor, 13A, 13B, 13C...support portion, 14...second board (board), 14a...support portion, 15...switching element, 16...power control circuit, 17A, 17B...battery side bus bar, 17Aa, 17Ba...terminal fixing portion, 17Ab, 17Bb...circuit fixing portion, 17Ac, 17Bc...flexure part, 18A, 18B, 18C...motor side bus bars, 18Aa, 18Ba, 18Ca...terminal fixing parts, 18Ab, 18Bb, 18Cb...circuit fixing parts, 18Ac, 18Bc, 18Cc...flexed parts, 19A, 19B...connection bus bars, 20...base block, 21...inter-board connector, 22...signal connector, 23...mating hole, 40...Hall IC, 45, 46...fixing screws, 50...magnetic shielding member.

Claims

1. a base block on which at least a portion of the power control circuit is disposed; A support portion protruding from the base block; a substrate fixed to the base block via the support; A current-carrying electrode connected to the power control circuit; a magnetic detection element attached to the substrate at a position close to the electrode and configured to detect a magnetic field caused by a current flowing through the electrode; The motor control device according to claim 1, wherein the magnetic detection element is disposed in the vicinity of a support portion supported by the support column at an end portion in an extending direction of the substrate.

2. the electrodes are formed by bus bars fixed to the base block; 2. The motor control device according to claim 1, wherein a bent portion is provided at a portion of the bus bar so as to be adjacent to the magnetic detection element.

3. A plurality of the electrodes are provided, The magnetic detection elements are provided in a row along one edge of the substrate in an extending direction, 3. The motor control device according to claim 1, wherein the one edge of the substrate is fixed to the base block via a plurality of the support columns.

4. The electrode is A pair of battery side bus bars connected to the battery; three motor side bus bars connected to a three-phase power supply of the motor; The battery side bus bars are respectively arranged on the outer sides of the three motor side bus bars arranged side by side in an arrangement direction, 4. The motor control device according to claim 3, wherein the magnetic detection elements are arranged at a position adjacent to one of the battery side bus bars and at a position adjacent to each of the three motor side bus bars on the outer sides in the arrangement direction.

5. The motor control device according to claim 4, characterized in that the support pillars are respectively arranged at approximately midpoints between one motor side bus bar on the outside in the arrangement direction and one of the battery side bus bars adjacent to the motor side bus bar, and at approximately midpoints between another motor side bus bar on the outside in the arrangement direction and the other battery side bus bar adjacent to the motor side bus bar.

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