Motor and rotor

Patent metadata

Field	Value
Publication number	US-10141821-B2
Application number	US-201414490016-A
Country	US
Kind code	B2
Filing date	Sep 18, 2014
Priority date	Sep 24, 2013
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A motor includes a rotor and a stator. The rotor includes a first rotor core including a plurality of first claw-like magnetic poles, a second rotor core including a plurality of second claw-like magnetic poles, and a magnetic field magnet arranged between the first and second rotor cores. The first and second claw-like magnetic poles are alternately arranged in a circumferential direction. The magnetic field magnet causes the first and second claw-like magnetic poles to function as magnetic poles different from each other. The stator includes a first stator core including a plurality of first claw-like magnetic poles, a second stator core including a plurality of second claw-like magnetic poles, and a coil section arranged between the first and second stator cores. The stator is configured to cause the first and second claw-like magnetic poles of the stator to function as magnetic poles different from each other and switch polarities of the magnetic poles on the basis of energization to the coil section. At least ones of the claw-like magnetic poles of the rotor and the claw-like magnetic poles of the stator are formed in a shape in which circumferential centers of distal end portions are shifted in the circumferential direction with respect to circumferential centers of proximal end portions.

First claim

What is claimed is:

1. A motor comprising:
a rotor including:
a first rotor core including a plurality of first claw-like magnetic poles projecting in an axial direction;
a second rotor core including a plurality of second claw-like magnetic poles projecting in the axial direction; and
a permanent magnet arranged between the first and second rotor cores in the axial direction,

the first and second claw-like magnetic poles being alternately arranged in a circumferential direction, and
the permanent magnet causing the first and second claw-like magnetic poles to function as magnetic poles different from each other; and
a stator including:
a first stator core including a plurality of first claw-like magnetic poles projecting in the axial direction;
a second stator core including a plurality of second claw-like magnetic poles projecting in the axial direction; and
a coil section arranged between the first and second stator cores and wound around in the circumferential direction,

the first and second claw-like magnetic poles of the stator being alternately arranged in the circumferential direction and being opposed to the first and second claw-like magnetic poles of the rotor, and
the stator is configured to cause the first and second claw-like magnetic poles of the stator to function as magnetic poles different from each other and switch polarities of the magnetic poles on the basis of energization to the coil section, wherein
the claw-like magnetic poles of the stator are formed in a shape in which circumferential centers of distal end portions are shifted in a rotating direction of the rotor with respect to circumferential centers of proximal end portions, and
the claw-like magnetic poles of the rotor are formed in a shape in which a circumferential centers of distal end portions are shifted in a counter rotating direction of the rotor with respect to circumferential centers of proximal end portions.

2. A motor comprising:
a rotor including:
a first rotor core including a plurality of first rotor side claw-like magnetic poles projecting in an axial direction;
a second rotor core including a plurality of second rotor side claw-like magnetic poles projecting in the axial direction; and
a magnetic field magnet arranged between the first and second rotor cores in the axial direction,

the first and second rotor side claw-like magnetic poles being alternately arranged in a circumferential direction, and
the magnetic field magnet causing the first and second rotor side claw-like magnetic poles to function as magnetic poles different from each other; and
a stator including:
a first stator core including a plurality of first stator side claw-like magnetic poles projecting in the axial direction;
a second stator core including a plurality of second stator side claw-like magnetic poles projecting in the axial direction; and
a coil section arranged between the first and second stator cores and wound around in the circumferential direction,

the first and second stator side claw-like magnetic poles being alternately arranged in the circumferential direction and being opposed to the first and second rotor side claw-like magnetic poles, and
the stator is configured to cause the first and second stator side claw-like magnetic poles to function as magnetic poles different from each other and switch polarities of the magnetic poles on the basis of energization to the coil section, wherein
the first and second rotor cores include a plurality of extending sections extending in a radial direction from base sections that sandwich the magnetic field magnet in the axial direction,
the first rotor side claw-like magnetic poles are provided at radially distal end portions of the extending sections of the first rotor core,
the second rotor side claw-like magnetic poles are provided at radially distal end portions of the extending sections of the second rotor core,
the first and second stator cores include a plurality of extending sections extending in the radial direction from base sections,
the first stator side claw-like magnetic poles are provided at radially distal end portions of the extending sections of the first stator core,
the second stator side claw-like magnetic poles are provided at radially distal end portions of the extending sections of the second stator core,
the extending sections of the rotor are formed in a shape in which circumferential centers of the radially distal end portions are shifted in a counter rotating direction of the rotor with respect to circumferential centers of radially proximal end portions, and
the extending sections of the stator are formed in a shape in which circumferential centers of the radially distal end portions are shifted in a rotating direction of the rotor with respect to circumferential centers of radially proximal end portions.

Assignees

• Asmo Co Ltd
• Denso Corp

Inventors

• Takemoto Yoshiaki
• Matsuda Masashi
• Morimoto Yusuke

Classifications

• H02K1/2733

  Annular magnets · CPC title

• H02K1/226

  Electricity · mapped topic

• H02K1/145

  having an annular coil, e.g. of the claw-pole type · CPC title

• H02K21/145 Primary

  having an annular armature coil (with homopolar co-operation H02K21/20) · CPC title

• H02K1/2713

  the magnetisation axis of the magnets being axial, e.g. claw-pole type · CPC title