ELECTRIC DRIVE APPARATUS

• US 20150333600A1
• Filed: 10/01/2012
• Published: 11/19/2015
• Est. Priority Date: 10/01/2012
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: NAKANO, Masatsugu, AKUTSU, Satoru, SONODA, Isao, USHIO, Kohei, ASAO, Yoshihito
• Granted Patent: US 9,627,944 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H02K 11/215 Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
• CPC Class Codes: H02K 11/33 Drive circuits, e.g. power electronics H02K11/38 takes precedence
• CPC Class Codes: H02K 2211/03 Machines characterised by circuit boards, e.g. pcb
• CPC Class Codes: H02K 29/08 using magnetic effect devices, e.g. Hall-plates, magneto-resistors H02K29/12 takes precedence

Abstract

Provided is an electric drive apparatus in which a detected portion (10) of a rotation angle sensor is disposed at an end of a shaft (7) of a motor, and a sensor portion (300) as a detection portion of the rotation angle sensor is disposed coaxially with the rotating axis of the shaft. In a control unit (200), an inverter circuit portion with a drive element (SW) for driving the motor, and a control substrate (17) which is separate from the sensor portion and controls the output of the inverter circuit portion are disposed. The sensor portion and the control substrate are electrically connected, with the control substrate disposed along a plane perpendicular to the rotating axis of the shaft.

Claims

1. An electric drive apparatus equipped with a motor and a control unit serving as a drive device portion disposed on the opposite side to the output axis side of said motor, said electric drive apparatus comprising:

a detected portion of a rotation angle sensor, said detected portion being disposed at an end of a shaft on the opposite side to the output axis side of said motor; and

a sensor portion serving as a detection portion of said rotation angle sensor, said sensor portion being disposed at a position coaxially with the rotating axis of said shaft,

said control unit including;

an inverter circuit portion having a drive element which is attached to a heat sink and is for driving said motor; and

a control substrate which is separate from said sensor portion and controls the output of said inverter circuit portion; and

said sensor portion and said control substrate being electrically connected and the arrangement of said control substrate being disposed along a plane perpendicular to the rotating axis of said shaft of said motor.

2. The electric drive apparatus according to claim 1,

wherein said sensor portion has a substrate;

said substrate is mounted with a magnetic sensor;

said substrate is provided with a connection member to be electrically connected to said control substrate and said sensor portion, and a supporting member to be integrated with said connection member; and

said connection member passes through said inverter circuit portion.

3. The electric drive apparatus according to claim 1,

wherein said sensor portion is disposed on a heat sink of said inverter circuit portion and is disposed on the motor side when viewed from said heat sink.

4. The electric drive apparatus according to claim 1,

wherein said sensor portion is electrically connected to said control substrate directly.

5. The electric drive apparatus according to claim 1,

further comprising an intermediate member disposed between said heat sink and said control substrate, and

wherein electrical connection between said sensor portion and said control substrate is positioned by said intermediate member.

6. The electric drive apparatus according to claim 5,

wherein said intermediate member is configured so that a first connection member to be electrically connected to said sensor portion and a second connection member to be electrically connected to said control substrate are integrated.

7. The electric drive apparatus according to claim 1,

wherein press-fitting is used for electrical connection between said sensor portion and said control substrate.

8. The electric drive apparatus according to claim 1,

wherein said detected portion has a permanent magnet;

said sensor portion has a magnetic sensor; and

said magnetic sensor is disposed at a position facing said permanent magnet.

9. The electric drive apparatus according to claim 8,

wherein said permanent magnet is magnetized in two poles and a magnetized direction is formed on a flat plane perpendicular to the rotating axis of said shaft.

10. The electric drive apparatus according to claim 8,

wherein said sensor portion has a substrate;

and

said substrate is disposed such that at least one surface of said substrate is mounted with said magnetic sensor and the other side of said substrate is also mounted with a component.

11. The electric drive apparatus according to claim 8,

wherein said sensor portion has a substrate;

and

said substrate is disposed such that at least two magnetic sensors are mounted on both surfaces of said substrate at positions coaxially with the rotating axis of said shaft.

12. The electric drive apparatus according to claim 1,

wherein said sensor portion has a substrate;

said substrate is mounted with a magnetic sensor; and

said substrate is fixed to said heat sink by screw-fastening.

13. The electric drive apparatus according to claim 1,

further comprising a magnetic shield disposed between said sensor portion and said heat sink.

14. The electric drive apparatus according to claim 1,

wherein said detected portion of said rotation angle sensor has a protruded portion and is configured by a rotor for a sensor, said rotor having magnetism;

and

said sensor portion is a resolver which is configured by a coil composed of an excitation winding an output winding and a stator for a sensor, said stator having core.