Permanent magnet rotating electric machine and electrically driven vehicle employing same

• US 6,034,460 A
• Filed: 04/11/1997
• Issued: 03/07/2000
• Est. Priority Date: 04/12/1996
• Status: Expired due to Term

• 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, Oda, Keiji, Matsunobe, Yutaka, Kawamata, Shouichi, Koizumi, Osamu, Tajima, Fumio
• Primary Examiner(s): Ramirez, Nestor
• Assistant Examiner(s): Nguyen, Tran N.
• Application Number:
  US08/838,745
• Time in Patent Office: 1,061 Days
• Field of Search: 310/156, 310/162, 310/261, 310/166, 310/179, 310/180, 310/185, 310/269, 310/51, 310/184, 310/198, 310/152
• US Class Current: 310/179
• 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, wherein said three-phase windings are concentratively wound around each of said stator salient poles, said windings of each phase are wound around at more than one stator salient pole, and said windings of each phase have a phase difference of voltage between at least one of the windings and the other.

Claims

1. A permanent magnet rotating electric machine comprising:

a stator having stator salient poles;

three-phase windings wound around said stator salient poles;

a rotor which is supported rotatably inside said stator; and

permanent magnets inserted into said rotor and positioned opposite to said stator salient, wherein

said three-phase windings are concentratively wound on said stator salient poles;

each of said stator salient poles is concentratively wound by a single phase winding of the three-phase windings; and

windings within each particular phase of said three phase windings have a voltage phase difference between one winding of said particular phase and at least one other windings of the same particular phase.

2. A permanent magnet rotating electric machine according to claim 1, wherein M:

P=6n;

6n±

2 is satisfied where M is the number of said stator salient poles, P is the number of said permanent magnets, and n is a positive integer.

3. A permanent magnet rotating electric machine according to claim 1, wherein M:

P=3n;

3n±

1 is satisfied where M is the number of said stator salient poles, P is the number of said permanent magnets of said rotor, and n is a positive integer.

4. A permanent magnet rotating electric machine according to claim 1, wherein the number of poles of said permanent magnets is eight or more.

5. A permanent magnet rotating electric machine according to claim 1, wherein a magnetic pole piece area of said rotor is projected toward said stator.

6. The machine according to claim 1 wherein said rotor is an internal magnet rotor.

7. An electrically driven vehicle comprising:

a permanent magnet rotating electric machine being coupled to drive wheels comprising;

a stator having stator salient poles;

three-phase windings wound around said stator salient poles;

a rotor which is supported rotatably inside the said stator;

permanent magnets inserted into said rotor and positioned opposite to said stator salient poles; and

control means for supplying a voltage to said three-phase windings, wherein

said three-phase windings are concentratively wound around each of said stator salient poles;

each of said stator salient poles is concentratively wound by a single phase winding of the three-phase windings; and

windings within each particular phase of said three phase windings have a voltage phase difference between one winding of said particular phase and at least one other windings of the same particular phase.

8. The machine according to claim 7 wherein said rotor is an internal magnet rotor.