AC rotating electric machine control method and electrical power train system

• US 7,518,331 B2
• Filed: 04/29/2005
• Issued: 04/14/2009
• Est. Priority Date: 04/30/2004
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Innami, Toshiyuki, Fujino, Shinichi, Hashimoto, Keita
• Primary Examiner(s): Benson; Walter
• Assistant Examiner(s): GLASS, ERICK DAVID
• Application Number:
  US11/117,504
• Publication Number:
  US 20050242759A1
• Time in Patent Office: 1,446 Days
• Field of Search: 318/432, 318/629, 318712-714
• US Class Current: 318/712
• CPC Class Codes: B60K 6/26 characterised by the motors or the generators
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 15/025 using field orientation; Vector control; Direct Torque Control [DTC]
• CPC Class Codes: B60L 15/2045 for optimising the use of energy
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: H02P 21/02 specially adapted for optimising the efficiency at low load
• CPC Class Codes: H02P 6/08 Arrangements for controlling the speed or torque of a single motor H02P6/10, H02P6/28 take precedence
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• 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
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

Solving Means: A field coil current and a stator current are controlled by a controller. The stator current is controlled under vector control and is controlled so that the phase keeps an efficient motor zone. In a case of rated power generation, when the motor speed is low, the phase current and field coil current are increased to reserve the generated power. And, as the speed is increased, the phase current is decreased to reduce the copper loss, while in place of decreasing the phase current, the field coil current is kept high to reserve the generated power. Thereafter, as the speed is increased more, the field coil current is decreased to reduce the iron loss, while in place of decreasing the field coil current, the phase current is increased to reserve the generated power.

Claims

1. A control method for a field wound-rotor type AC rotating electric machine including a stator having a multi-phase armature winding electrically connected to a power source via a power transducer and a rotor having a field winding, comprising the steps of:

controlling a current flowing through said field winding and

controlling said power transducer and a current flowing through said multi-phase armature winding, wherein

said control method controls variously and harmoniously both said current flowing through said field winding and said current flowing through said multi-phase armature winding.

2. An AC rotating electric machine control method according to claim 1, wherein:

said control method, according to a speed of said AC rotating electric machine, controls said current flowing through said field winding and said current flowing through said multi-phase armature winding.

3. An AC rotating electric machine control method according to claim 2, wherein:

said control method, on the basis of a torque instruction value outputted from a host controller, controls said current flowing through said field winding and said current flowing through said multi-phase armature winding.

4. An AC rotating electric machine control method according to claim 1, wherein

in response to an increase in a rotational speed of the AC rotating electric machine, the current flowing through the field winding is decreased and the current flowing through said multi-phase armature winding is increased to maintain a power output by the rotating electric machine.

5. A control method for a field wound-rotor type AC rotating electric machine including a stator having a multi-phase armature winding electrically connected to a power source via a power transducer and a rotor having a field winding, comprising the steps of:

controlling a current flowing through said field winding and

controlling said power transducer and a current flowing through said multi-phase armature winding, wherein,

when said electrical connection between said power source and said power transducer is cut, a d-axial current component of said current flowing through said multi-phase armature winding is increased in one direction.

6. An AC rotating electric machine control method according to claim 5, wherein:

a voltage increase due to said cutting is absorbed by an electrolytic capacitor electrically connected between said power source and said power transducer.

7. An electrical power train system loaded on a car having a mobile power source, comprising:

a rotating electric machine and

a controller for controlling said rotating electric machine, wherein;

said rotating electric machine is of an AC type using a field winding and includes a stator having a multi-phase armature winding and a rotor rotatably installed on said stator via air gaps,

said multi-phase armature winding is electrically connected to said mobile power source via said controller,

said rotor has the field winding, and

said controller controls a current flowing through said multi-phase armature winding and a current flowing through said field winding, wherein

said controller, according to an operation status of said car, controls variously and harmoniously both said current flowing through said multi-phase armature winding and said current flowing through said field winding.

8. An electrical power train system loaded in a car having a secondary battery as a mobile power source for transferring rotation driving force of an internal combustion engine as one driving source of said car to axles via a transmission and driving wheels to rotate, comprising:

a rotating electric machine mechanically connected to said internal combustion engine and

a controller for controlling said rotating electric machine, wherein;

said rotating electric machine is of an AC type using a field winding, which is a motor generator operating as a motor when power supplied from said mobile power source is supplied via said controller and operating as a generator when driven from said internal combustion engine and includes a stator having a multi-phase armature winding and a rotor rotatably installed on said stator via air gaps,

said multi-phase armature winding is electrically connected to said mobile power source via said controller,

said rotor has the field winding, and

said controller controls a current flowing through said multi-phase armature winding and a current flowing through said field winding, wherein

said controller, according to an operation status of said car, in said both operations when said rotating electric machine operates as a motor and operates as a generator, controls variously and harmoniously both said current flowing through said multi-phase armature winding and said current flowing through said field winding.

9. An electrical power train system according to claim 8, wherein:

said rotating electric machine, after said car is stopped and said internal combustion engine is stopped, when said internal combustion engine is restarted, receives said power supplied from said mobile power source via said controller, thereby operates as a motor and starts said internal combustion engine and when said mobile power source is required to be charged or said car is in a damping state, is driven by said internal combustion engine or kinetic energy of said car, thereby operates as a generator and supplies said generated power to said mobile power source via said controller.

10. An electrical power train system according to claim 8, wherein:

said rotating electric machine is installed side by side in said internal combustion engine and is mechanically connected to said internal combustion engine by a belt.

11. An electrical power train system according to claim 8, wherein:

said rotating electric machine is built in a transmission and is mechanically connected to said internal combustion engine.

12. An electrical power train system according to claim 8, wherein:

said controller includes field control means for controlling said current flowing through said field winding,

power conversion means for controlling said current flowing through said multi-phase armature winding, and

control means for controlling said field control means and said power conversion means.

13. A mobile body comprising an electrical power train system stated in claim 8.

14. An electrical power train system according to claim 8, wherein:

in response to an increase in rotational of speed said rotating electrical machine while the electrical machine operates as a generator, the controller decreases the current flowing through the field winding and increases the current flowing through said multi-phase armature winding to maintain a power output by the rotating electric machine.

15. An electrical power train system loaded in a car for driving a driving shaft of one wheel among a plurality of wheels by rotation driving force of an internal combustion engine using said internal combustion engine as one driving source of said car and driving a driving shaft of another one wheel among said plurality of wheels by motor-driven force, including a power transfer mechanism installed on said driving shaft driven by said motor-driven force and a generator driven by a secondary battery as a mobile power source and said internal combustion engine, comprising:

a rotating electric machine mechanically connected to said power transfer mechanism and

a controller for controlling said rotating electric machine, wherein;

said rotating electric machine is of an AC type using a field winding, which is a motor generator operating as a motor when power supplied from said secondary battery or said internal combustion engine is supplied via said controller and operating as a generator when driven by kinetic energy of said car and includes a stator having a multi-phase armature winding and a rotor rotatably installed on said stator via air gaps,

said multi-phase armature winding is electrically connected to said mobile power source via said controller,

said rotor has the field winding, and

said controller controls a current flowing through said multi-phase armature winding and a current flowing through said field winding, wherein

said controller, according to an operation status of said car, in said both operations when said rotating electric machine operates as a motor and operates as a generator, controls variously and harmoniously both said current flowing through said multi-phase armature winding and said current flowing through said field winding.

16. An electrical power train system according to claim 15, wherein:

said rotating electric machine, when assisting driving of said car by said internal combustion engine, receives said power supplied from said mobile power source via said controller, thereby operates as a motor, and assists driving of said car by said internal combustion engine and

when said car is in a damping state, is driven by kinetic energy of said car, thereby operates as a generator, and supplies said generated power to said secondary battery via said controller.

17. An electrical power train system according to claim 15, wherein:

said controller includes field control means for controlling said current flowing through said field winding,

power conversion means for controlling said current flowing through said multi-phase armature winding, and

control means for controlling said field control means and said power conversion means.

18. A mobile body comprising an electrical power train system stated in claim 15.