Driving/electric-power generating system for vehicle

• US 20060006655A1
• Filed: 07/11/2005
• Published: 01/12/2006
• Est. Priority Date: 07/12/2004
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Hino, Noriaki, Kobayashi, Takashi, Shirakawa, Shinji, Kanazawa, Hiroshi, Mashino, Keiichi, Tsuchiya, Masanori
• Granted Patent: US 7,224,079 B2
• Time in Patent Office: Days
• US Class Current: 290/40.B
• 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 three-phase winding; and

a three-phase inverter connected to the three-phase winding,

wherein the three-phase winding is comprised of at least two independent three-phase windings, and

wherein switching elements for respective phases in the three-phase inverter are connected in parallel by the number of windings in the independent three-phase windings, and in-phase windings are individually connected to the respective parallel switching elements.

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

wherein the windings small in phase difference, of the independent three-phase windings are divided into groups corresponding to three phases, and

the switching elements of the inverter, which are connected to the windings belonging to the same groups, are driven by the same gate signal.

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

voltage-driven system.

4. The driving/electric-power generating system for vehicle according to claim 2, wherein respective one-phase coils of the independent three-phase windings are disposed so as to straddle a plurality of slots.

5. The driving/electric-power generating system for vehicle according to claim 2, wherein an on-off timing of the three-phase inverter corresponds to a phase center of induced voltages of plural windings driven simultaneously.

6. The driving/electric-power generating system for vehicle according to claim 2, wherein the switching elements are MOS-FETs and

a timing provided to perform switching to MOS rectification upon an electric power generating operation of the electric rotating machine is produced based on a coil current delayed in phase, of the same phase coils of the independent three-phase windings.

7. The driving/electric-power generating system for vehicle according to claim 6, wherein the coil current delayed in phase is detected from a current of a diode disposed in parallel with each of the MOS-FETS.

8. The driving/electric-power generating system for vehicle according to claim 6, wherein upon the electric power generating operation of the electric rotating machine, diode rectification is taken when the current that flows through the electric rotating machine is of a low current, and MOS rectification is taken when the current is of a high current.

9. The driving/electric-power generating system for vehicle according to claim 1, wherein the switching elements of the inverter are mounted integrally with the electric rotating machine.

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

wherein the windings small in phase difference, of the independent three-phase windings are divided into groups corresponding to three phases, and

the switching elements of the inverter, which are connected to the windings, are respectively controlled by independent gate signals and the inverter is of a 180°

voltage-driven system.

11. The driving/electric-power generating system for vehicle according to claim 10, wherein the switching elements are MOS-FETS, and

upon the electric power generating operation of the electric rotating machine, the gate signals that drive the MOS-FETs are produced by converting diode currents flowing through individual diodes to voltages, and a reference voltage for producing an on-signal of the gate signals and a reference voltage for producing an off-signal of the gate signals are different from each other in voltage.

12. The driving/electric-power generating system for vehicle according to claim 11, wherein upon the electric power generating operation of the electric rotating machine, the reference voltage for the off signal of the gate signals is higher than that for the on-signal of the gate signals.

13. The driving/electric-power generating system for vehicle according to claim 11, wherein the independent three-phase windings are constituted of at least a pair of a Y-connection and a Δ

-connection, and the respective windings are set identical in the number of turns, and one three-phase winding is used for driving and generation of electric power and the other three-phase winding is used only for generation of electric power.

14. The driving/electric-power generating system for vehicle according to claim 13, wherein the Y-connection and Δ

-connection are respectively connected to an inverter.