JP6969285B2 - Motor unit - Google Patents

Description

The present invention relates to a motor unit.

As a conventional motor unit, for example, the technique described in Patent Document 1 is known. The motor unit described in Patent Document 1 includes an electric motor unit and an electronic control unit (ECU) unit. The electric motor unit includes a motor housing and an electric motor housed inside the motor housing. The electronic control unit is arranged on the side opposite to the axial output shaft of the motor housing, and the ECU housing is integrally fixed to the motor housing by fixing bolts, and the electronic control unit housed inside the ECU housing. It is composed of a solid. A lid is fixed to the end face of the ECU housing by fixing bolts. The lid is provided with a connector terminal forming portion for power supply, a connector terminal forming portion for a detection sensor, and a connector terminal forming portion for transmitting a control state.

Japanese Unexamined Patent Publication No. 2016-146702

However, the above-mentioned prior art has the following problems. That is, each connector terminal forming portion is open on the side opposite to the electric motor portion in the axial direction of the electric motor portion. Further, the connector terminal forming portion for power supply is longer in the axial direction than the connector terminal forming portion for the detection sensor and the connector terminal forming portion for sending the control state. Therefore, when the motor unit is mounted on a vehicle, a frame or the like exists on the front side of the electronic control device unit (opposite side of the electric motor unit with respect to the electronic control device unit), so that a connector for power supply is provided. When the work space for the terminal forming portion is exhausted, the power supply connector cannot be attached to or detached from the connector terminal forming portion for power supply. In this case, it is necessary to mount the motor unit on the vehicle after mounting the power supply connector on the connector terminal forming portion for power supply in advance, which leads to deterioration of workability.

An object of the present invention is to provide a motor unit capable of improving workability.

One aspect of the present invention is a motor unit including a motor and an inverter integrated with the motor and controlling the motor. The inverter is arranged in an inverter case and an inverter case, and a semiconductor element is mounted. One board, a second board arranged in parallel with the first board in the inverter case and on which electronic control components are mounted, and a motor shaft arranged between the first board and the second board in the inverter case. It has a bus bar extending to the side wall of the inverter case in a direction perpendicular to the direction, and a power input terminal to which a power cable is attached / detached in the extending direction of the bus bar is provided at the end of the side wall side of the bus bar. It is characterized by being.

In such a motor unit, the bus bar is arranged between the first substrate and the second substrate in the inverter case, and extends to the side wall of the inverter case in the direction perpendicular to the axial direction of the motor. At the end of the side wall of the bus bar, a power input terminal is provided to which the power cable is attached / detached in the extending direction of the bus bar. Therefore, the power cable is attached to and detached from the power input terminal along the direction perpendicular to the axial direction of the motor. Therefore, even if there is no work space on the front side of the inverter (opposite the motor to the inverter) after mounting the motor unit, the power cable can be attached to and detached from the power input terminal. As a result, it is not necessary to mount the motor unit after mounting the power cable to the power input terminal in advance, which improves workability. Further, since the bus bar is arranged between the first board and the second board so as to extend in the direction perpendicular to the axial direction of the motor, the space between the first board and the second board is effectively used. be able to.

The inverter has a signal line connector to which an external connector is attached and detached, and the signal line connector may be open to the motor side in the axial direction of the motor. In such a configuration, the external connector is attached to the signal line connector from the motor side toward the inverter side along the axial direction of the motor. Therefore, even if there is no work space on the front side of the inverter after mounting the motor unit, the external connector can be attached to and detached from the signal line connector. As a result, it is not necessary to mount the motor unit after mounting the external connector on the signal line connector in advance, which further improves workability.

At least one of the current sensor and the transformer may be mounted on the main surface of the second substrate on the first substrate side. Current sensors and transformers are tall components. Since such a high-height component is efficiently arranged in the space between the first substrate and the second substrate, the inverter can be miniaturized in the axial direction of the motor.

The first board is arranged on the motor side of the second board, the inverter is arranged between the first board and the second board in the inverter case in parallel with the first board, and a capacitor is mounted. It has a third substrate and a heat sink which is arranged on the motor side of the first substrate and dissipates heat from the first substrate, and the bus bar is arranged between the second substrate and the third substrate. May be good. In such a configuration, the space between the second substrate and the third substrate can be effectively used. Further, since the heat generated from the semiconductor element is dissipated by the heat sink, it is possible to prevent the first substrate from becoming hot.

The capacitor may be mounted on the main surface of the third substrate on the first substrate side so as to face the heat sink in the direction perpendicular to the axial direction of the motor. Capacitors are tall components. Since such a capacitor is space-efficiently arranged so as to face the heat sink in the direction perpendicular to the axial direction of the motor, the inverter can be miniaturized in the axial direction of the motor.

According to the present invention, workability can be improved.

It is a perspective view which shows the appearance of the motor unit which concerns on one Embodiment of this invention. It is a perspective view of the inverter shown in FIG. It is a rear view of the inverter shown in FIG. FIG. 3 is a sectional view taken along line IV-IV of FIG. FIG. 3 is a sectional view taken along line VV of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing the appearance of a motor unit according to an embodiment of the present invention. In FIG. 1, the motor unit 1 of the present embodiment is mounted on an industrial vehicle such as a battery-powered forklift. The motor unit 1 includes a motor 2 and an inverter 4 that is integrated with the motor 2 via a duct 3 and controls the motor 2.

The motor 2 is a three-phase AC motor. The motor 2 has a motor body 5 having a rotor and a stator, a motor case 6 accommodating the motor body 5, and motor terminals 35A to 35C (see FIG. 3) drawn from a coil wound around the stator. doing. A fan (not shown) for cooling the inverter 4 is integrally attached to the motor body 5. When the motor body 5 rotates, the fan rotates.

The duct 3 covers the portion of the motor case 6 on the inverter 4 side together with the fan. The duct 3 rectifies the flow of wind generated by the rotation of the fan.

The inverter 4 is fixed to the motor 2 via a duct 3 by a plurality of bolts (not shown). The inverter 4 converts a direct current from a battery (not shown) into an alternating current to control the rotational operation of the motor body 5 of the motor 2.

FIG. 2 is a perspective view of the inverter 4. FIG. 3 is a rear view of the inverter 4 shown in FIG. FIG. 4 is a sectional view taken along line IV-IV of FIG. FIG. 5 is a sectional view taken along line VV of FIG. In FIGS. 1 to 5, the inverter 4 includes an inverter case 7 and an inverter cover 8 that covers the inside of the inverter case 7. The inverter cover 8 is arranged on the opposite side of the motor 2 with respect to the inverter case 7. The inverter case 7 and the inverter cover 8 have a substantially rectangular shape in a plan view.

A substrate accommodating portion 10, a capacitor accommodating portion 11, and a motor terminal accommodating portion 12 are provided in the inverter case 7.

The substrate accommodating portion 10 accommodates a MOS (Metal Oxide Semiconductor) substrate 13, which is a semiconductor substrate, a control substrate 14, and a capacitor substrate 15. The MOS substrate 13 constitutes a first substrate on which a MOS element 16 which is a plurality of semiconductor elements is mounted. The MOS element 16 includes a switching element and the like. The control board 14 constitutes a second board on which a plurality of electronic control components 17 are mounted. A current sensor 18, a transformer 19, and the like are also mounted on the control board 14. The capacitor board 15 constitutes a third board on which a plurality of capacitors 20 are mounted.

The MOS substrate 13 is arranged closer to the motor 2 than the control substrate 14. The MOS substrate 13 is arranged so that the upper surface 13a and the lower surface 13b, which are the main surfaces, are perpendicular to the axial direction of the motor 2 (A direction in FIGS. 1 and 2). The MOS substrate 13 is fixed to the inverter case 7 or the heat sink 24 (described later) by a plurality of bolts 21. The MOS element 16 is mounted on the upper surface 13a (main surface on the inverter cover 8 side) of the MOS substrate 13.

The control board 14 is arranged parallel to the MOS board 13 on the inverter cover 8 side (opposite side of the motor 2) of the MOS board 13. It should be noted that the term "parallel" here is not limited to perfect parallelism, and may be substantially parallel. The control board 14 is fixed to the inverter case 7 by a plurality of bolts 22. The electronic control component 17 is mounted on the upper surface 14a (main surface on the inverter cover 8 side) of the control board 14. High-height components such as the current sensor 18 and the transformer 19 are mounted on the lower surface 14b (main surface on the MOS board 13 side) of the control board 14.

The capacitor board 15 is arranged in parallel with the MOS board 13 between the MOS board 13 and the control board 14. It should be noted that the parallelism referred to here is not limited to perfect parallelism, and may be substantially parallel. The capacitor substrate 15 is arranged close to the MOS substrate 13. The capacitor substrate 15 is arranged so as to be offset from the MOS substrate 13 to one side of the inverter case 7. The capacitor board 15 is fixed to the inverter case 7 by a plurality of bolts 23. The capacitor 20 is mounted on the lower surface 15b (main surface on the MOS board 13 side) of the capacitor board 15.

A heat sink 24 that dissipates heat from the MOS substrate 13 is arranged on the motor 2 side of the MOS substrate 13. The heat sink 24 is attached to the inverter case 7 so as to come into contact with the lower surface 13b (main surface on the motor 2 side) of the MOS substrate 13. The heat sink 24 has a plurality of heat dissipation fins 24a. The heat generated from the MOS element 16 is dissipated by the heat sink 24 through the MOS substrate 13.

A power input extending between the control board 14 and the capacitor board 15 to the side wall 7a on one side of the inverter case 7 (the offset side of the capacitor board 15 with respect to the MOS board 13) in the direction perpendicular to the axial direction of the motor 2. Bus bars 25A and 25B are arranged. That is, the power input bus bars 25A and 25B are arranged between the MOS board 13 and the control board 14. The power input bus bars 25A and 25B are fixed to the heat sink 24 by a plurality of bolts 26 via the relay terminals 27A and 27B and the MOS substrate 13, respectively.

The power input bus bar 25A is a bus bar on the positive electrode side. The power input bus bar 25B is a bus bar on the negative electrode side. The power input bus bar 25A is electrically connected to the positive electrode patterns of the MOS board 13, the control board 14, and the capacitor board 15. The power input bus bar 25B is electrically connected to the negative electrode patterns of the MOS board 13, the control board 14, and the capacitor board 15.

As described above, the heat sink 24, the MOS board 13, the capacitor board 15, the power input bus bars 25A and 25B, and the control board 14 are arranged in order from the motor 2 side to the inverter cover 8 side in the board accommodating portion 10. It becomes.

At the tips of the power input bus bars 25A and 25B (ends on the side wall 7a side), power input terminals 30A and 30B to which the power cables 29A and 29B are attached and detached in the extending direction of the power input bus bars 25A and 25B are respectively. It is provided. The power cables 29A and 29B are cables for supplying electric power to the inverter 4.

The power input terminals 30A and 30B are integrally provided with the power input bus bars 25A and 25B, respectively. The power input terminals 30A and 30B project from the outer surface of the side wall 7a of the inverter case 7. The power input terminals 30A and 30B have bolt holes 31A and 31B into which the bolt 45 is screwed, respectively. The tips of the power cables 29A and 29B are connected to the power input terminals 30A and 30B by bolts 45, respectively. A sealing material 32 is interposed between the power input terminals 30A and 30B and the side wall 7a.

The capacitor accommodating portion 11 accommodates a plurality of capacitors 20 mounted on the lower surface 15b of the capacitor substrate 15. The capacitor accommodating portion 11 is arranged adjacent to the heat sink 24 on the motor 2 side of the substrate accommodating portion 10 in the region on the side wall 7a side (power input terminals 30A, 30B side) of the inverter case 7. Therefore, the capacitor 20 is mounted on the lower surface 15b of the capacitor substrate 15 so as to face the heat sink 24 with the inverter case 7 sandwiched in the direction perpendicular to the axial direction of the motor 2.

A heat radiating member 33 that dissipates heat from the capacitor 20 is arranged between the tip surface of the capacitor 20 and the inverter case 7. The heat generated from the capacitor 20 is dissipated by the heat sink 24 through the heat radiating member 33 and the inverter case 7.

The motor terminal accommodating portion 12 accommodates the tip portions of the motor terminals 35A to 35C. The motor terminal accommodating portion 12 is arranged on the opposite side of the power input terminals 30A and 30B with respect to the substrate accommodating portion 10. The motor terminals 35A to 35C are connected to the motor output bus bars 36A to 36C, respectively. The motor output bus bars 36A to 36C extend from the motor terminal accommodating portion 12 to the substrate accommodating portion 10. The motor output bus bars 36A to 36C are fixed to the heat sink 24 by a plurality of bolts 37 in the substrate accommodating portion 10 via the relay terminals 38A to 38C and the MOS substrate 13, respectively.

A support portion 39 is provided so as to project from the outer surface of the other one side of the inverter case 7. Specifically, the support portion 39 projects from the outer surface on one side in the direction perpendicular to the facing direction between the power input terminals 30A and 30B and the motor terminals 35A to 35C in the inverter case 7.

The support portion 39 is provided with a signal line connector 41 to which the external connector 40 is attached / detached. The external connector 40 is a connector plug for communicating with an external device (not shown). The signal line connector 41 is electrically connected to the signal pattern of the control board 14. The signal line connector 41 is open to the motor 2 side in the axial direction of the motor 2.

As described above, in the present embodiment, the power input bus bars 25A and 25B are arranged between the MOS board 13 and the control board 14 in the inverter case 7 in the direction perpendicular to the axial direction of the motor 2. It extends to the side wall 7a of the inverter case 7. At the end of the power input bus bars 25A and 25B on the side wall 7a side, power input terminals 30A and 30B to which the power cables 29A and 29B are attached and detached are provided in the extending direction of the power input bus bars 25A and 25B. There is. Therefore, the power cables 29A and 29B are attached to and detached from the power input terminals 30A and 30B along the direction perpendicular to the axial direction of the motor 2. Therefore, even if there is no work space because the frame or the like is arranged on the front side of the inverter 4 (the opposite side of the motor 2 with respect to the inverter 4) after the motor unit 1 is mounted on the industrial vehicle, the power supply is supplied. The cables 29A and 29B can be attached to and detached from the power input terminals 30A and 30B. As a result, it is not necessary to mount the power cables 29A and 29B to the power input terminals 30A and 30B in advance and then mount the motor unit 1 on the industrial vehicle, so that workability is improved.

Further, since the power input bus bars 25A and 25B are arranged between the MOS board 13 and the control board 14 so as to extend in the direction perpendicular to the axial direction of the motor 2, the space between the MOS board 13 and the control board 14. Space can be used effectively.

Further, in the present embodiment, the signal line connector 41 is open to the motor 2 side in the axial direction of the motor 2. Therefore, the external connector 40 is attached to the signal line connector 41 from the motor 2 side toward the inverter 4 side along the axial direction of the motor 2. Therefore, even if there is no work space on the front side of the inverter 4 after the motor unit 1 is mounted, the external connector 40 can be attached to and detached from the signal line connector 41. As a result, it is not necessary to mount the motor unit 1 on the industrial vehicle after mounting the external connector 40 on the signal line connector 41 in advance, so that workability is further improved.

Further, in the present embodiment, the current sensor 18 and the transformer 19 are mounted on the main surface of the control board 14 on the MOS board 13 side. Therefore, since the current sensor 18 and the transformer 19 having a large height are arranged in the space between the MOS board 13 and the control board 14 with high space efficiency, the inverter 4 should be miniaturized in the axial direction of the motor 2. Can be done.

Further, in the present embodiment, the MOS substrate 13 is arranged on the motor 2 side of the control board 14, and the heat sink 24 that dissipates heat from the MOS substrate 13 is arranged on the motor 2 side of the MOS substrate 13. A capacitor board 15 is arranged between the MOS board 13 and the control board 14 in the inverter case 7, and the power input bus bars 25A and 25B are located between the control board 14 and the capacitor board 15. Is located in. Therefore, the space between the control board 14 and the capacitor board 15 can be effectively used. Further, since the heat generated from the MOS element 16 is dissipated by the heat sink 24, the MOS substrate 13 is prevented from becoming hot.

Further, in the present embodiment, the capacitor 20 is mounted on the main surface of the capacitor board 15 on the MOS board 13 side so as to face the heat sink 24 in the direction perpendicular to the axial direction of the motor 2. Therefore, the capacitor 20 having a large height is arranged in a space-efficient manner so as to face the heat sink 24 in the direction perpendicular to the axial direction of the motor 2, so that the inverter 4 is further miniaturized in the axial direction of the motor 2. be able to.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the current sensor 18 and the transformer 19 having a large height are mounted on the lower surface 14b of the control board 14, but the present invention is not particularly limited to that form, and only one of the current sensor 18 and the transformer 19 is mounted. May be mounted on the lower surface 14b of the control board 14. Further, a component having a large height other than the current sensor 18 and the transformer 19 may be mounted on the lower surface 14b of the control board 14.

Further, in the above embodiment, the capacitor board 15 is arranged between the MOS board 13 and the control board 14 in the inverter case 7, and the power input bus bars 25A and 25B are arranged between the control board 14 and the capacitor board 15. However, the form is not particularly limited. For example, the MOS board 13 and the capacitor board 15 are arranged side by side at the same position in the axial direction of the motor 2, and the power input bus bars 25A and 25B are arranged between the control board 14 and the MOS board 13 and the capacitor board 15. It may have been done. Further, the MOS element 16 and the capacitor 20 may be mounted on one common board, and the power input bus bars 25A and 25B may be arranged between the control board 14 and the common board.

1 ... motor unit, 2 ... motor, 4 ... inverter, 7 ... inverter case, 7a ... side wall, 13 ... MOS board (first board), 14 ... control board (second board), 14b ... bottom surface (main surface), 15 ... Capacitor substrate (third substrate), 15b ... Bottom surface (main surface), 16 ... MOS element (semiconductor element), 17 ... Electronic control component, 18 ... Current sensor, 19 ... Transformer, 20 ... Capacitor, 24 ... Heat sink, 25A, 25B ... Power input bus bar (bus bar), 29A, 29B ... Power cable, 30A, 30B ... Power input terminal, 40 ... External connector, 41 ... Signal line connector.

Claims (4)

In a motor unit including a motor and an inverter integrated with the motor and controlling the motor.
The inverter
Inverter case and
A first substrate arranged in the inverter case and on which a semiconductor element is mounted, and
A second board arranged in the inverter case in parallel with the first board and on which electronic control components are mounted,
A third board arranged in parallel with the first board between the first board and the second board in the inverter case and on which a capacitor is mounted.
A bus bar arranged between the first board and the second board in the inverter case and extending to the side wall of the inverter case in a direction perpendicular to the axial direction of the motor.
A heat sink that dissipates heat from the first substrate,
Have,
The first board is arranged on the motor side of the second board.
The heat sink is arranged on the motor side of the first substrate.
The bus bar is arranged between the second substrate and the third substrate.
At the end of the bus bar on the side wall side, a power input terminal to which a power cable is attached / detached in the extending direction of the bus bar is provided .
The capacitor is mounted on the main surface of the third substrate on the first substrate side so as to face the heat sink in a direction perpendicular to the axial direction of the motor, and the capacitor is mounted on the main surface of the third substrate on the first substrate side in the axial direction of the motor. A motor unit characterized by not overlapping. The inverter has a signal line connector to which an external connector is attached and detached.
The motor unit according to claim 1, wherein the signal line connector is open to the motor side in the axial direction of the motor. The motor unit according to claim 1 or 2, wherein at least one of a current sensor and a transformer is mounted on the main surface of the second substrate on the first substrate side. The third board is arranged so as to be offset to one side of the inverter case in a direction perpendicular to the axial direction of the motor with respect to the first board.
The bus bar extends to the side wall of the inverter case on the deviation side of the third board with respect to the first board.
Any of claims 1 to 3, wherein the capacitor is mounted on the main surface of the third substrate on the first substrate side so as to face the heat sink in the extending direction of the bus bar. The motor unit described in item 1 .

Images