Rotating electric machine

• US 7,196,447 B2
• Filed: 09/26/2005
• Issued: 03/27/2007
• 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:
  US11/234,113
• Publication Number:
  US 20060017344A1
• Time in Patent Office: 547 Days
• Field of Search: 310/156.53, 310/156.56, 310/216, 310/261
• 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 the stator salient poles, a rotor rotatable held inside the stator, and permanent magnets inserted into the rotor and positioned opposite to the stator salient poles. Three-phase windings, which are concentratively wound around each of the stator salient poles, are wound around 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 rotating electric machine for a vehicle, comprising:

a stator;

a rotor held rotatably inside said stator;

wherein,

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 embedded beneath the surface of said rotor core;

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

said permanent magnets are arranged between said auxiliary magnetic pole areas, with permanent magnets which are located on circumferentially opposite sides of said auxiliary magnetic pole areas having different polarities; and

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.

7. The rotating electric machine according to claim 1, wherein

magnetic pole piece areas are formed at said stator core and at an 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.

2. A rotating electric machine for an automobile, comprising:

a stator; and

a rotor held rotatably inside said stator;

wherein,

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, with a plurality of magnet inserting holes being formed inside said rotor core;

said permanent magnets are embedded beneath the surface of said rotor care, inserted in said magnet inserting holes;

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

said magnetic inserting holes are arranged between said auxiliary magnetic pole areas in a circumferential direction of said rotor, with permanent magnets which are located at circumferentially opposite sides of said each of said auxiliary magnetic pole areas having different polarities; and

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

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

a stator; and

a rotor held rotatably inside said stator;

wherein,

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 embedded beneath the surface of said rotor core;

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

magnet inserting holes are arranged inside 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 at one side of each particular auxiliary magnetic pole area and another permanent magnet which is located at a circumferentially opposite side of said particular auxiliary magnetic pole areas have different polarities;

said rotor has a number of poles that differs from a number of poles of said stator; and

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.

4. A rotating electric machine for an automobile, comprising:

a stator; and

a rotor held rotatably inside said stator;

wherein,

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 embedded beneath the surface of said rotor core;

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

magnet inserting holes are arranged inside 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 at circumferentially opposite sides of said auxiliary magnetic pole areas are different; and

a number of poles of said stator is a multiple of three, and a number of poles of said rotor is different from a number of poles of said stator.

8. A rotating electric machine according to claim 4, wherein said number of poles of said rotor is eight.

9. A rotating electric machine according to claim 4, wherein said number of poles of said rotor is ten.

5. A rotating electric machine for an automobile, comprising:

a stator; and

a rotor held rotatably inside said stator;

wherein,

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 embedded beneath the surface of said rotor core;

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

magnet inserting holes are arranged inside 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 at circumferentially opposite sides of said auxiliary magnetic pole areas are different;

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

three phase alternating current is supplied to said stator windings;

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

a number of poles of said rotor is different from a number of poles of said stator.

6. A rotating electric machine for an automobile, comprising:

a stator; and

a rotor held rotatably inside said stator;

wherein,

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 embedded beneath the surface of said rotor core;

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

magnet inserting holes are arranged inside 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 on circumferentially opposite sides of said auxiliary magnetic pole areas are different;

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

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

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

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

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