Electric vehicle using a motor

• US 6,356,001 B1
• Filed: 04/06/2000
• Issued: 03/12/2002
• Est. Priority Date: 02/23/1996
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Nishiyama, Noriyoshi, Murakami, Hiroshi, Nakamura, Tomokazu, Ikkai, Yasufumi, Honda, Yukio, Kawano, Shinichiro
• Primary Examiner(s): Mullins, Burton S.
• Application Number:
  US09/544,065
• Time in Patent Office: 705 Days
• Field of Search: 310/156, 310/261, 310/254, 180/65.1, 186/65.5
• US Class Current: 310/156.53
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 1/276 Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
• CPC Class Codes: H02K 1/2766 having a flux concentration effect
• CPC Class Codes: H02K 21/16 having annular armature cores with salient poles with homopolar co-operation H02K21/20
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility

Abstract

The invention relates to a motor comprising a stator core having plural teeth and slots provided among the teeth, a winding applied on the teeth by a single turn, and a rotor incorporating plural permanent magnets, which is rotated and driven by utilizing reluctance torque in addition to magnet torque. By turning thus divided teeth by a single winding, the occupation rate of the winding in the slots can be raised. As a result, a motor of small size and large output can be presented.

Claims

1. An electric vehicle comprising:

an axle,

wheels supported on said axle,

a drive unit for rotating said axle,

a power supply unit for feeding electric power to said drive unit,

wherein said drive unit includes a motor,

said motor includes a stator core having a plurality of core elements and said stator core has 3n teeth, where n is a natural number, a concentrated winding applied over each tooth part of said plurality of core elements and a rotor including 2n permanent magnets.

2. The electric vehicle of claim 1, wherein said rotor includes a rotor core, said plurality of permanent magnets are disposed in said rotor core, said rotor core comprising a material of high permeability such that a magnetic flux which results from the production of a rotary magnetic field may pass through said material.

3. The motor of claim 1 wherein each of said plurality of core elements is separated from an adjacent one of said core elements at the stator inner circumference by a distance of less than 0.2 mm.

4. The motor of claim 1 wherein a center of at least one of said plurality of permanent magnets projects toward a center of said rotor.

5. The motor of claim 1 wherein a distance between a center of at least one of said plurality of permanent magnets and an outer circumference of said rotor is greater than a distance between a first end or a second end of said at least one of said plurality of permanent magnets and said outer circumference of said rotor.

6. The motor of claim 1, additionally comprising a ring-shaped stator frame which surrounds said plurality of core elements.

7. An electric vehicle of claim 1, wherein each of said plurality of permanent magnets is provided at a larger pitch than the stator coil pitch.

8. An electric vehicle comprising:

an axle,

wheels supported on said axle,

a drive unit for rotating said axle,

a power supply unit for feeding electric power to said drive unit,

wherein said drive unit includes a motor and an engine,

said motor includes a stator core having a plurality of 3n core elements which include tooth parts where n is a natural number, a concentrated winding applied over each tooth part of said plurality of core elements and a rotor including a plurality of 2n permanent magnets.

9. The motor of claim 8 wherein said concentrated winding applied over each tooth part results in a wire filling rate of greater than 30% of an air gap surrounding said tooth part.

10. The motor of claim 9 wherein said wire filling rate is greater than 60% of said air gap.

11. An electric vehicle of claim 8, wherein each of said plurality of permanent magnets is provided at a larger pitch than the stator coil pitch.

24. An electric vehicle of claim 8, wherein each of said plurality of permanent magnets is provided at a larger pitch than the stator coil pitch.

12. An electric vehicle comprising:

an axle,

wheels supported on said axle,

a drive unit for rotating said axle,

a power supply unit for feeding electric power to said drive unit,

wherein said drive unit includes a motor,

said motor includes a stator core having a plurality of 3n core elements which include tooth parts where n is a natural number, a concentrated winding applied over each tooth part of said plurality of core elements and a rotor including a plurality of 2n permanent magnets, and

said stator core is formed in an annular form by combining said plurality of core elements.

13. The electric vehicle of claim 12, wherein said plurality of core elements are arranged in said annular form by engaging a bump included on each of said core elements with a concavity included on an adjacent core element.

14. An electric vehicle of claim 12, wherein each of said plurality of permanent magnets is provided at a larger pitch than the stator coil pitch.

15. An electric vehicle comprising:

an axle,

wheels supported on said axle,

a drive unit for rotating said axle, and

a power supply unit for feeding electric power to said drive unit,

wherein said drive unit includes a motor,

said motor includes a stator core having a plurality of 3n core elements which include tooth parts where n is a natural number, a concentrated winding applied over each tooth part of said plurality of core elements and a rotor including a plurality of 2n permanent magnets,

said plurality of permanent magnets are arranged around a shaft of said motor,

at least one of said plurality of permanent magnets includes a magnet forward portion and a magnet backward portion,

wherein said magnet forward portion is angled from said stator core towards said shaft such that a first end of said magnet forward portion is closer to said stator core than a second end of said magnet forward portion, said magnet backward portion is angled from said stator core towards said shaft such that a second end of said magnet backward portion is closer to said stator core than a first end of said magnet backward portion, said second end of said magnet forward portion being coupled to said first end of said magnet backward portion.

16. The motor of claim 15 herein said magnet forward portion has a larger width than said magnet backward portion.

17. The motor of claim 15 wherein each of said plurality of permanent magnets is separated from an adjacent one of said permanent magnets by a separation of between 15% and 20% of a width of said teeth that are adjacent to two of said permanent magnets.

18. The motor of claim 15 wherein said plurality of permanent magnets are arranged around said shaft of said motor in a plurality of layers.

19. An electric vehicle of claim 15, wherein each of said plurality of permanent magnets is provided at a larger pitch than the stator coil pitch.

20. An electric vehicle comprising

an axle,

wheels supported on said axle,

a drive unit for rotating said axle, and

a portion supply unit for feeding electric power to said drive unit,

wherein said drive element includes a motor,

said motor includes a stator core having a plurality of 3n core elements which include tooth parts where n is a natural number, a concentrated winding applied over each tooth part of said plurality of core elements and a rotor including a plurality of 2n permanent magnets,

said plurality of permanent magnets are arranged around a shaft of said motor, and

at least one of said plurality of permanent magnets has a side which is angled from said stator core towards said shaft.

21. An electric vehicle of claim 20, wherein each of said plurality of permanent magnets is provided at a larger pitch than the stator coil pitch.

22. An electric vehicle comprising:

an axle,

wheels supported on said axle,

a drive unit for rotating said axle, and

a power supply unit for feeding electric power to said drive unit,

wherein said drive unit includes a motor,

said motor includes a stator core having a plurality of 3n core elements which include tooth parts where n is a natural number, a concentrated winding applied over each tooth part of said plurality of core elements and a rotor including a plurality of 2n permanent magnets, and

a first outer periphery portion of said rotor is of a different shape than a second outer periphery portion of said rotor.

23. The motor of claim 22 wherein said first outer periphery portion has the shape of an arc of a circle, and said second outer periphery portion is substantially flat.