Driving/electric-power generating system for vehicle

• US 7,471,004 B2
• Filed: 05/07/2007
• Issued: 12/30/2008
• Est. Priority Date: 07/12/2004
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Kobayashi, Takashi, Shirakawa, Shinji, Hino, Noriaki, Kanazawa, Hiroshi, Tsuchiya, Masanori, Mashino, Keiichi
• Primary Examiner(s): GONZALEZ, JULIO C
• Application Number:
  US11/745,036
• Publication Number:
  US 20070200346A1
• Time in Patent Office: 603 Days
• Field of Search: 290/40.B, 290/40.C, 290/40.R, 363/37, 363/89, 363/97, 363/98, 363/132, 322/7, 322/24
• US Class Current: 290/40.00B
• CPC Class Codes: H02J 7/1492 by means of controlling devices between the generator output and the battery
• CPC Class Codes: H02P 25/22 Multiple windings; Windings for more than three phases
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles

Abstract

An AC generator comprises a rotor and a stator having a three-phase winding. A three-phase inverter is connected to the three-phase winding. Here, the three-phase winding comprises at least two independent three-phase windings. Switching elements for respective phases of the three-phase inverter are connected in parallel by the number of the independent three-phase windings, and in-phase windings are individually connected to their parallel switching elements.

Claims

1. A driving/electric-power generating system for vehicle comprising:

an electric rotating machine comprised of a rotor and a stator having a first three-phase winding and a second three-phase winding that are independent of each other; and

a three-phase inverter connected to the first and second three-phase windings, respectively,

wherein U-phase, V-phase and W-phase windings of the first three-phase winding are electrically displaced with respect to corresponding U-phase, V-phase and W-phase windings of the second three-phase winding, and

wherein switching elements for respective phases in the three-phase inverters are connected in parallel by the number of windings in the first and second three-phase windings, each winding of the first and second three-phase windings is individually connected to each of the parallel switching elements by phase,

wherein each of the switching elements is comprised of an upper-arm switching element and a lower-arm switching element by phase,

wherein the switching elements of the three-phase inverters are divided into six groups of U-phase upper-arm switching elements corresponding to respective U-phase of the first and second three-phase windings, V-phase upper-arm switching elements corresponding to respective V-phase of the three phase-windings, W-phase upper arm switching elements corresponding to respective W-phase of the three-phase windings, U-phase lower-arm switching elements corresponding to respective U-phases of the three phase-windings, V-phase lower-arm switching elements corresponding to respective V-phases of the three-phase windings, and W-phase lower-arm switching elements corresponding to respective W-phases of the three-phase windings, and

wherein the switching elements of each same group of the six groups are driven with a same gate signal having phase-by-phase common on-off timing.

2. The driving/electric-power generating system for vehicle according to claim 1, wherein the each gate signal of the inverter is based on a 180°

voltage-driven system.

3. The driving/electric-power generating system for vehicle according to claim 1, wherein respective one-phase coils of the independent three-phase windings are disposed so as to straddle a plurality of slots.

4. The driving/electric-power generating system for vehicle according to claim 1, wherein the switching elements of the two three-phase inverters are mounted integrally with the electric rotating machine.

5. The driving/electric-power generating system for vehicle according to claim 1,

wherein each phase winding of the first and second three-phase windings is individually connected to each switching element of the two three-phase inverters by phase,

each of the switching elements is controlled by individual gate signals and the inverter is of a 180°

voltage-driven system.