MOTOR AND ROTOR 2015-04-29


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.

Claims:

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 magnetic field 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 magnetic field 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 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. 
2. The motor according to claim 1, 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. 
3. The motor according to claim 2, wherein 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. 
4. 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 cores, and at least one of the extending sections of the rotor 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 the circumferential direction with respect to circumferential centers of radially proximal end portions. 
5. The motor according to claim 4, wherein 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. 
6. The motor according to claim 5, wherein 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. 
7. 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. 
8. The motor according to claim 7, wherein 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. 
9. The motor according to claim 7, wherein 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. 
10. The motor according to claim 7, wherein 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. 
11. The motor according to claim 7, 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 poles at unequal intervals in the circumferential direction. 
12. A motor comprising single motor sections in a plurality of stages arranged in an axial direction, each of the single motor sections including: a rotor section including: a first rotor core including a plurality of first rotor side claw-like magnetic poles in a circumferential direction; a second rotor core including a plurality of second rotor side claw-like magnetic poles in the circumferential direction; and a magnetic field magnet arranged between the first and second rotor cores assembled to each other, the rotor section causing the first and second rotor side claw-like magnetic poles to alternately function as different magnetic poles; and a stator section including: a first stator core including a plurality of first stator side claw-like magnetic poles in the circumferential direction; a second stator core including a plurality of second stator side claw-like magnetic poles in the circumferential direction; and a coil section arranged between the first and second stator cores assembled to each other, the stator section being capable of switching polarities of the first and second stator side claw-like magnetic poles on the basis of energization to the coil section, wherein the single motor sections in the plurality of stages include (n+1) single motor sections for a U phase, n single motor sections for a V phase, and n single motor sections for a W phase, and the single motor sections for the U phase are arranged in stages located at axial two ends. 
13. The motor according to claim 12, wherein the single motor section for the U phase and the single motor section for the W phase are respectively arranged on axial two sides of the single motor section for the V phase, and the single motor section for the U phase and the single motor section for the V phase are respectively arranged on axial two sides of the single motor section for the W phase. 
14. The motor according to claim 13, wherein the single motor sections are arranged in four stages of the single motor section for the U phase, the single motor section for the V phase, the single motor section for the W phase, and the single motor section for the U phase in this order in the axial direction. 
15. A rotor comprising: a magnetic field magnet magnetized in an axial direction; a first rotor core including: a first rotor core base arranged on one side in the axial direction of the magnetic field magnet; and a plurality of first claw-like magnetic poles located at equal intervals in an outer circumferential section of the first rotor core base and respectively bent to extend to the magnetic field magnet side in the axial direction; and a second rotor core including: a second rotor core base arranged on the other side in the axial direction of the magnetic field magnet; and a plurality of second claw-like magnetic poles located at equal intervals in an outer circumferential section of the second rotor core base and respectively bent to extend to the magnetic field magnet side in the axial direction, the second claw-like magnetic poles being respectively arranged between corresponding ones of the first claw-like magnetic poles of the first rotor core, wherein the magnetic field magnet causes the first claw-like magnetic poles to function as first magnetic poles and causes the second claw-like magnetic poles to function as second magnetic poles, the first claw-like magnetic poles of the first rotor core are coupled to each other by a ring-like first annular auxiliary magnet including a plurality of first magnet sections that control leakage fluxes from the first claw-like magnetic poles to the second claw-like magnetic poles adjacent thereto in the circumferential direction, and the second claw-like magnetic poles of the second rotor core are coupled to each other by a ring-like second annular auxiliary magnet including a plurality of second magnet sections that control leakage fluxes from the second claw-like magnetic poles to the first claw-like magnetic poles adjacent thereto in the circumferential direction. 
16. The rotor according to claim 15, wherein the first annular auxiliary magnet is bonded and fixed to surfaces of the first claw-like magnetic poles that are formed by cutting out outer side corner sections of bent portions of the first claw-like magnetic poles, the first annular auxiliary magnet is set to contact with distal end portions of the second claw-like magnetic poles of the second rotor core that are relatively arranged between corresponding ones of the first claw-like magnetic poles adjacent to one another, the second annular auxiliary magnet is bonded and fixed to surfaces of the second claw-like magnetic poles that are formed by cutting out outer side corner sections of bent portions of the second claw-like magnetic poles, and the second annular auxiliary magnet is set to contact with distal end portions of the first claw-like magnetic poles of the first rotor core that are relatively arranged between corresponding ones of the second claw-like magnetic poles adjacent to one another. 
17. The rotor according to claim 15, wherein the first annular auxiliary magnet includes the first magnet sections divided in the circumferential direction so that the number of the first magnet sections equals to the number of the first claw-like magnetic poles and the second claw-like magnetic poles, and the second annular auxiliary magnet includes the second magnet sections divided in the circumferential direction so that the number of the second magnet sections equals to the number of the first claw-like magnetic poles and the second claw-like magnetic poles.

Read more: http://www.faqs.org/patents/app/20150084470#ixzz3kE22KBUk
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