Motor and rotor

Patent metadata

Field	Value
Publication number	US-10756607-B2
Application number	US-201816186472-A
Country	US
Kind code	B2
Filing date	Nov 9, 2018
Priority date	Sep 24, 2013
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

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 single motor sections in three stages arranged in order of a first stage, a second stage, and a third stage in an axial direction,
each of the single motor sections includes:
a rotor section including:
a first rotor core including a plurality of claw-like magnetic poles in a circumferential direction;
a second rotor core including a plurality of claw-like magnetic poles in the circumferential direction; and
a permanent magnet arranged between the first and second rotor cores and magnetized in the axial direction; and

a stator section including:
a first stator core including a plurality of claw-like magnetic poles in the circumferential direction;
a second stator core including a plurality of claw-like magnetic poles in the circumferential direction; and
a winding wire arranged between the first and second stator cores and wound around in the circumferential direction, wherein

in at least one of the rotor section and the stator section in the single motor section of the second stage, the plurality of claw-like magnetic poles are provided at unequal intervals in the circumferential direction,
the permanent magnet in the second stage has a magnetized direction that differs in the axial direction from a magnetized direction of each of the permanent magnets in the first and third stages,
a configuration in which the claw-like magnetic poles are arranged at equal intervals in the circumferential direction in the stator section in each of the first to third stages and a phase is shifted by a same angle between the stator sections in the first stage and the second stage and between the stator sections in the second stage and the third stage is referred to as a reference configuration, and
the claw-like magnetic poles of the stator section in the second stage are arranged at unequal intervals to increase an overlapping width in the circumferential direction between the claw-like magnetic poles of the stator section in the first stage and the claw-like magnetic poles of the stator section in the second stage with respect to the reference configuration and to increase an overlapping width in the circumferential direction between the claw-like magnetic poles of the stator section in the second stage and the claw-like magnetic poles of the stator section in the third stage with respect to the reference configuration.

2. A motor comprising single motor sections in three stages arranged in order of a first stage, a second stage, and a third stage in an axial direction,
each of the single motor sections includes:
a rotor section including:
a first rotor core including a plurality of claw-like magnetic poles in a circumferential direction;
a second rotor core including a plurality of claw-like magnetic poles in the circumferential direction; and
a permanent magnet arranged between the first and second rotor cores and magnetized in the axial direction; and

a stator section including:
a first stator core including a plurality of claw-like magnetic poles in the circumferential direction;
a second stator core including a plurality of claw-like magnetic poles in the circumferential direction; and
a winding wire arranged between the first and second stator cores and wound around in the circumferential direction, wherein

in at least one of the rotor section and the stator section in the single motor section of the second stage, the plurality of claw-like magnetic poles are provided at unequal intervals in the circumferential direction,
the permanent magnet in the second stage has a magnetized direction that differs in the axial direction from a magnetized direction of each of the permanent magnets in the first and third stages,
a configuration in which the claw-like magnetic poles are arranged at equal intervals in the circumferential direction in the rotor section in each of the first to third stages and a phase is shifted by a same angle between the rotor sections in the first stage and the second stage and between the rotor sections in the second stage and the third stage is referred to as a reference configuration, and
the claw-like magnetic poles of the rotor section in the second stage are arranged at unequal intervals to reduce an overlapping width in the circumferential direction between the claw-like magnetic poles of the rotor section in the first stage and the claw-like magnetic poles of the rotor section in the second stage and to reduce an overlapping width in the circumferential direction between the claw-like magnetic poles of the rotor section in the second stage and the claw-like magnetic poles of the rotor section in the third stage.

3. A motor comprising single motor sections in three stages arranged in order of a first stage, a second stage, and a third stage in an axial direction,
each of the single motor sections includes:
a rotor section including:
a first rotor core including a plurality of claw-like magnetic poles in a circumferential direction;
a second rotor core including a plurality of claw-like magnetic poles in the circumferential direction; and
a permanent magnet arranged between the first and second rotor cores and magnetized in the axial direction; and

a stator section including:
a first stator core including a plurality of claw-like magnetic poles in the circumferential direction;
a second stator core including a plurality of claw-like magnetic poles in the circumferential direction; and
a winding wire arranged between the first and second stator cores and wound around in the circumferential direction, wherein

in at least one of the rotor section and the stator section in the single motor section of the second stage, the plurality of claw-like magnetic poles are provided at unequal intervals in the circumferential direction,
the permanent magnet in the second stage has a magnetized direction that differs in the axial direction from a magnetized direction of each of the permanent magnets in the first and third stages,
the claw-like magnetic poles of the rotor section in the single motor section in each of the stages include first rotor side claw-like magnetic poles provided at equal intervals in the circumferential direction in the first rotor core and second rotor side claw-like magnetic poles provided at equal intervals in the circumferential direction in the second rotor core,
in the single motor sections in the first stage and the third stage, the first and second rotor cores are assembled to alternately arrange the first rotor side claw-like magnetic poles and the second rotor side claw-like magnetic poles at equal intervals in the circumferential direction, and
in the single motor section in the second stage, the first and second rotor cores are assembled to alternately arrange the first rotor side claw-like magnetic poles and the second rotor side claw-like magnetic poles at unequal intervals in the circumferential.

4. The motor according to claim 1 , wherein
the claw-like magnetic poles of the stator section in the single motor section in each of the stages include first stator side claw-like magnetic poles provided at equal intervals in the circumferential direction in the first stator core and second stator side claw-like magnetic poles provided at equal intervals in the circumferential direction in the second stator core,
in the single motor sections in the first stage and the third stage, the first and second rotor cores are assembled to alternately arrange the first stator side claw-like magnetic poles and the second stator side claw-like magnetic poles at equal intervals in the circumferential direction, and
in the single motor section in the second stage, the first and second stator cores are assembled to alternately arrange the first stator side claw-like magnetic poles and the second stator side claw-like magnetic

Assignees

• Denso Corp

Inventors

• Takemoto Yoshiaki
• Matsuda Masashi
• Morimoto Yusuke

Classifications

• H02K21/044

  Rotor of the claw pole type · CPC title

• H02K1/2733

  Annular magnets · CPC title

• H02K1/145

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

• H02K1/2713

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

• H02K1/2706

  Inner rotors · CPC title