Driving apparatus

• US 7,417,349 B2
• Filed: 09/26/2005
• Issued: 08/26/2008
• Est. Priority Date: 04/12/1996
• Status: Expired due to Fees

• Current Assignee: Hitachi Car Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
• Original Assignee: Hitachi Car Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
• Inventors: Shibukawa, Suetaro, Matsunobe, Yutaka, Kawamata, Shouichi, Koizumi, Osamu, Tajima, Fumio, Oda, Keijiro
• Primary Examiner(s): NGUYEN, TRAN N
• Application Number:
  US11/234,133
• Publication Number:
  US 20060017346A1
• Time in Patent Office: 1,065 Days
• Field of Search: 310/156.08, 310/156.53, 310/156.56, 310/156.57, 310/156.05, 310/216, 318/254
• US Class Current: 310/156.53
• CPC Class Codes: B60L 15/025 using field orientation; Vector control; Direct Torque Control [DTC]
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: H02K 1/246 Variable reluctance rotors
• CPC Class Codes: H02K 1/276 Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
• CPC Class Codes: H02K 19/103 Motors having windings on the stator and a variable reluctance soft-iron rotor without windings
• CPC Class Codes: H02K 21/16 having annular armature cores with salient poles with homopolar co-operation H02K21/20
• CPC Class Codes: H02K 2213/03 Machines characterised by numerical values, ranges, mathematical expressions or similar information
• CPC Class Codes: H02K 29/03 with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility

Abstract

A rotating electric machine comprises a stator having stator salient poles, three-phases windings wound around said stator salient poles, a rotor rotatable held inside the said stator, and permanent magnets inserted into said rotor and positioned opposite to said stator salient poles. The three-phase windings are concentratively wound around each of the stator salient poles, with windings of each phase wound around at more than one stator salient pole. The windings of each phase have a phase difference of voltage between at least one of the windings and the other.

Claims

1. A driving apparatus for a vehicle, comprising a rotating electric machine, wherein:

said rotating electric machine has a stator and a rotor held rotatably inside said stator;

said stator comprises a stator core and stator windings;

said stator windings comprise three-phase windings which are wound on said stator core;

said rotor comprises a rotor core and a plurality of permanent magnets held inside said rotor core;

a plurality of auxiliary magnetic pole areas are formed in said rotor core, along a radial direction of said rotor core;

said permanent magnets are arranged between said auxiliary magnetic pole areas, so that permanent magnets which are located both sides of said each of said auxiliary magnetic pole areas have different polarities;

a reluctance torque is generated at said auxiliary magnetic pole areas based on a magnetomotive force which is generated by three phase current flowing through said stator windings;

said driving apparatus further comprises an inverter; and

said three-phase current flowing through said stator windings are controlled by said inverter.

7. A driving apparatus according to claim 1, wherein:

magnetic pole piece areas are formed at said stator core and at outer side of said permanent magnets; and

magnetic circuits are formed which lead magnetic flux to a stator side through said permanent magnets and said magnetic pole piece areas.

8. A driving apparatus according to claim 7, wherein a number of poles of said rotor is eight.

9. A driving apparatus according to claim 8, wherein a number of poles of said rotor is ten.

2. A driving apparatus for a vehicle, comprising a rotating electric machine, wherein:

said rotating electric machine has a stator and a rotor held rotatably inside said stator;

said stator comprises a stator core and stator windings;

said stator windings comprise U-phase, V-phase and W-phase windings;

said rotor comprises a rotor core and a plurality of permanent magnets,

a plurality of magnet inserting holes are formed inside said rotor core;

said permanent magnets are inserted in said magnet inserting holes;

a plurality of auxiliary magnetic pole areas are formed surrounding of said rotor core;

said magnet inserting holes are arranged between said auxiliary magnetic pole areas, with permanent magnets which are located both sides of said each of said auxiliary magnetic pole areas having different polarities;

a reluctance torque is generated at said auxiliary magnetic pole areas based on a magnetomotive force which is generated by three phase current flowing through said stator windings of said U-phase, V-phase and W-phase;

said driving apparatus further comprises an inverter; and

said three-phase current flowing through said stator windings is supplied by said inverter.

3. A driving apparatus for a vehicle, comprising a rotating electric machine, wherein:

said rotating electric machine has a stator and a rotor held rotatably inside said stator;

said stator comprises a stator core and stator windings wound around said stator core;

said stator windings comprise U-phase, V-phase and W-phase windings;

said rotor comprising a rotor core and a plurality of permanent magnets held in said rotor core;

a plurality of auxiliary magnetic pole areas are formed in said rotor core, along a radial direction of said rotor core;

magnet inserting holes are arranged in said rotor core, between said auxiliary magnetic pole areas;

said permanent magnets are inserted in said magnet inserting holes so that a permanent magnet which is located on one side of said auxiliary magnetic pole areas and another permanent magnet which is located on another side of said auxiliary magnetic pole areas have different polarities;

said rotor has a number of poles that is different from a number of poles of said stator;

said auxiliary magnetic pole areas generate a reluctance torque based on a magnetomotive force which is generated by said U-phase, V-phase and W-phase windings of said stator;

said driving apparatus further comprises an inverter; and

said three-phase current is flowed through said stator windings by said inverter.

4. A driving apparatus for a vehicle, comprising a rotating electric machine, wherein:

said rotating electric machine has a stator and a rotor held rotatably inside said stator;

said stator comprises a stator core and stator windings wound around said stator core;

said stator windings comprise U-phase, V-phase and W-phase windings;

said rotor comprises a rotor core and a plurality of permanent magnets held inside said rotor core;

a plurality of auxiliary magnetic pole areas are formed in said rotor core, along a radial direction of said rotor core;

magnet inserting holes are arranged in said rotor core, between said auxiliary magnetic pole areas;

said permanent magnets are arranged in said magnet inserting holes so that polarities of permanent magnets which are located both sides of said auxiliary magnetic pole areas are different;

a number of poles of said rotor is multiple of three, and differs from a number of poles of said stator;

said driving apparatus further comprises an inverter; and

said three-phase current flowing through said stator windings is supplied by said inverter.

5. A driving apparatus for a vehicle, comprising a rotating electric machine, wherein:

said rotating electric machine has a stator and a rotor held rotatably inside said stator;

said stator comprises a stator core and stator windings wound around said stator core;

said rotor comprises a rotor core and a plurality of permanent magnets held inside said rotor core;

a plurality of auxiliary magnetic pole areas are formed along the radial direction of said rotor core and in said rotor core;

magnet inserting holes are arranged in said rotor core, between said auxiliary magnetic pole areas;

said permanent magnets are arranged in said magnet inserting holes so as that polarities of permanent magnets which are located both sides of said auxiliary magnetic pole areas are different;

a number of poles of said rotor is multiple of three;

said stator windings comprise U-phase, V-phase and W-phase windings;

a three phase alternating current is supplied to said stator windings;

a reluctance torque is generated at said auxiliary magnetic pole areas;

the number of poles of said rotor is different from a number of poles of said stator;

said driving apparatus further comprises an inverter; and

said three-phase current flowing through said stator windings is supplied by said inverter.

6. A driving apparatus for a vehicle, comprising a rotating electric machine, wherein:

said rotating electric machine has a stator and a rotor held rotatably inside said stator;

said stator comprises a stator core and stator windings wound around said stator core;

said rotor comprises a rotor core and a plurality of permanent magnets held inside said rotor core;

a plurality of auxiliary magnetic pole areas are formed in said rotor core, along a radial direction of said rotor core;

magnet inserting holes are arranged in said rotor core, between said auxiliary magnetic pole areas;

said permanent magnets are arranged in said magnet inserting holes so as that polarities of permanent magnets which are located both sides of said auxiliary magnetic pole areas are different;

a number of poles of said rotor is multiple of three;

said stator windings comprise U-phase, V-phase and W-phase windings;

said U-phase, V-phase and W-phase windings are connected as a star connection;

three phase alternative current is supplied to said stator windings;

a reluctance torque is generated at said auxiliary magnetic pole areas;

the number of poles of said rotor is different from a number of poles of said stator;

said driving apparatus further comprises an inverter; and

said three-phase current is flowed through said stator windings by said inverter.