Control apparatus for electric motor of inverter system and control apparatus for electro mechanical brake

• US 20050189890A1
• Filed: 02/09/2005
• Published: 09/01/2005
• Est. Priority Date: 02/27/2004
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Kuramochi, Yuichi, Manaka, Toshio
• Granted Patent: US 7,215,090 B2
• Time in Patent Office: Days
• US Class Current: 318/139
• CPC Class Codes: H02P 3/04 Means for stopping or slowing by a separate brake, e.g. friction brake, eddy-current brake brakes F16D, H02K49/00

Abstract

A relay switch for selectively connecting a power supply line of an inverter to a ground line is inserted between the inverter and a power source, and a power consumption unit such as a resistor element is inserted between the relay switch and ground line.

Claims

1. A control apparatus for an electric motor to be controlled by an inverter, comprising:

switching means for selectively switching a power supply line of said inverter to a ground line, said switching means being inserted between said inverter and a power source; and

power consumption means inserted between said switching means and said ground line.

2. The control apparatus for an electric motor according to claim 1, wherein a motor control is performed through a feedback control, and said switching means is closed upon occurrence of an abnormal state that a control deviation of the feedback control takes a predetermined value or larger.

3. The control apparatus for an electric motor according to claim 1, wherein said inverter is of a microcomputer control type, two microcomputers execute a same calculation process, and if calculation results by two microcomputers are not coincident, said switching means is closed.

4. The control apparatus for an electric motor according to claim 2, wherein said inverter is of a microcomputer control type, two microcomputers execute a same calculation process, and if calculation results by two microcomputers are not coincident, said switching means is closed.

5. The control apparatus for an electric motor according to claim 1, wherein said electric motor is a drive source for an electro mechanical brake.

6. The control apparatus for an electric motor according to claim 2, wherein said electric motor is a drive source for an electro mechanical brake.

7. The control apparatus for an electric motor according to claim 3, wherein said electric motor is a drive source for an electro mechanical brake.

8. A control apparatus for an electro mechanical brake for generating a thrust force by making an electric motor to be controlled by an inverter push brake pads against a brake disk, comprising:

switching means for selectively switching a power supply line of said inverter to a ground line, said switching means being inserted between said inverter and a power source; and

power consumption means inserted between said switching means and said ground line.

9. The control apparatus for an electro mechanical brake according to claim 8, further comprising thrust force detecting means for detecting a thrust force applied to said brake pads, wherein a feedback control is performed for the thrust force detected with said thrust force detecting means, and said switching means is closed upon occurrence of an abnormal state that a control deviation of the feedback control takes a predetermined value or larger.

10. The control apparatus for an electro mechanical brake according to claim 8, wherein said inverter is of a microcomputer control type, two microcomputers execute a same calculation process, and if calculation results by two microcomputers are not coincident, said switching means is closed.

11. The control apparatus for an electro mechanical brake according to claim 9, wherein said inverter is of a microcomputer control type, two microcomputers execute a same calculation process, and if calculation results by two microcomputers are not coincident, said switching means is closed.