Inverter-driven rotating machine system, rotating machine and inverter used in the same and electric vehicle using the same

• US 7,764,042 B2
• Filed: 06/25/2007
• Issued: 07/27/2010
• Est. Priority Date: 06/26/2006
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Yasuhara, Takashi, Obata, Koji, Matsunobu, Yutaka, Koizumi, Takayuki
• Primary Examiner(s): IP, SHIK LUEN PAUL
• Application Number:
  US11/819,131
• Publication Number:
  US 20080007197A1
• Time in Patent Office: 1,128 Days
• Field of Search: 318/400.24, 318/458, 318/800, 318/801, 361/23, 361/42, 361/47
• US Class Current: 318/801
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 3/0061 relating to electrical machines
• CPC Class Codes: B60L 50/13 using AC generators and AC motors
• CPC Class Codes: H02K 11/05 Rectifiers associated with casings, enclosures or brackets
• CPC Class Codes: H02K 11/26 Devices for sensing voltage, or actuated thereby, e.g. overvoltage protection devices
• CPC Class Codes: H02K 5/225 Terminal boxes or connection arrangements specially adapted for submersible motors H02K5/132
• CPC Class Codes: H02M 1/126 using passive filters
• CPC Class Codes: H02P 27/08 with pulse width modulation
• CPC Class Codes: H02P 29/0241 the fault being an overvoltage
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

Abstract

An inverter-driven rotating machine system is provided in which three-phase AC electric power of the inverter is supplied to a rear motor generator by using a cable. One end of an additional cable is connected to rotating machine terminals, namely motor input terminals of a motor case. The other end is connected to fixed voltage terminals, namely inverter additional terminals on an outer case of the inverter via resistors.

Claims

1. An inverter-driven rotating machine system comprising:

an inverter for outputting three-phase AC electric power;

a rotating machine driven by the output of said inverter;

a cable used to supply the output of said inverter to said rotating machine; and

an additional cable having one end connected to a terminal of said rotating machine and the other end connected to a fixed voltage terminal.

2. The inverter-driven rotating machine system according to claim 1,

wherein the other end of said additional cable is connected to said fixed voltage terminal via a resistor or a circuit formed by combining a resistor with a capacitor.

3. The inverter-driven rotating machine system according to claim 1,

wherein said additional cable greatly attenuates a high frequency;

and

the other end of said additional cable is directly connected to said fixed voltage terminal.

4. The inverter-driven rotating machine system according to claim 1,

wherein said fixed voltage terminal is any one of:

a corresponding phase voltage output terminal of said inverter to a voltage input terminal of said rotating machine, the corresponding phase voltage output terminal being connected with the voltage input terminal of said rotating machine by using said additional cable;

a corresponding phase voltage input terminal of said rotating machine;

the ground;

a DC smoothing capacitor terminal placed inside said inverter;

a battery terminal;

an input power source line of said inverter;

or the neutral point of the input power source line.

5. An inverter which outputs three-phase AC electric power and is used in an inverter-driven rotating machine system comprising:

the inverter;

a rotating machine which is driven by the output of the inverter; and

a cable which is used to supply the output of the inverter to said rotating machine, the inverter comprising;

a first terminal to which said cable is connected; and

a second terminal to which an additional cable is connected.

6. The inverter according to claim 5, further comprising:

a resistor or a circuit formed by combining a resistor with a capacitor, said resistor or said circuit being connected to said second terminal.

7. A rotating machine which is driven by the output of an inverter and is used in an inverter-driven rotating machine system comprising:

an inverter which outputs three-phase AC electric power;

the rotating machine; and

a cable which is used to supply the output of said inverter to the rotating machine, the rotating machine comprising

a first terminal to which said cable is connected and a second terminal to which an additional cable is connected.

8. An electric vehicle comprising an inverter-driven rotating machine system including:

an inverter which outputs three-phase AC electric power;

a rotating machine which is driven by the output of said inverter; and

a cable which is used to supply the output of said inverter to said rotating machine;

wherein an additional cable having one end connected to a terminal of said rotating machine and the other end connected to a fixed voltage terminal.