Motor, motor state detection device, and motor state determination device
AssigneeMINEBEA MITSUMI Inc.
InventorsYuma Ohno, Toshihiro Tamitsuji, Yuya Hisatomi
Life of this patent
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Abstract
A motor includes a rotor having a rotation shaft, a stator arranged oppositely in a circumferential direction of the rotor, and a pair of bearing portions rotatably supporting the rotation shaft, the pair of bearing portions each include a first bearing being rotatable together with the rotation shaft and a second bearing being rotatable together with the first bearing, the first bearing rotates together with the rotation shaft when the first bearing is normal, and the second bearing as well as the first bearing rotates together with the rotation shaft when the first bearing is abnormal.
Claims12
A motor comprising:
- a rotor having a rotation shaft;
- a stator arranged oppositely in a circumferential direction of the rotor;
- and
- a pair of bearing portions rotatably supporting the rotation shaft, wherein
- the pair of bearing portions each comprise:
- a first bearing being rotatable together with the rotation shaft;
- and
- a second bearing being rotatable together with the first bearing, and
- the first bearing rotates together with the rotation shaft when the first bearing is normal, and the second bearing as well as the first bearing rotates together with the rotation shaft when the first bearing is abnormal,
- wherein
- each bearing portion of the pair of bearing portions comprise a coupling portion coupling the first bearing and the second bearing to rotate in conjunction, and
- the coupling portions respectively comprised in the pair of bearing portions are coupled to rotate in conjunction.
A motor comprising:
- a rotor having a rotation shaft;
- a stator arranged oppositely in a circumferential direction of the rotor;
- and
- a pair of bearing portions rotatably supporting the rotation shaft, wherein
- the pair of bearing portions each comprise:
- a first bearing being rotatable together with the rotation shaft;
- and
- a second bearing being rotatable together with the first bearing, and
- the first bearing rotates together with the rotation shaft when the first bearing is normal, and the second bearing as well as the first bearing rotates together with the rotation shaft when the first bearing is abnormal,
- wherein the first bearing has a kinetic viscosity lower than a kinetic viscosity of the second bearing.
A motor comprising:
- a rotor having a rotation shaft;
- a stator arranged oppositely in a circumferential direction of the rotor;
- and
- a pair of bearing portions rotatably supporting the rotation shaft, wherein
- the pair of bearing portions each comprise:
- a first bearing being rotatable together with the rotation shaft;
- and
- a second bearing being rotatable together with the first bearing, and
- the first bearing rotates together with the rotation shaft when the first bearing is normal, and the second bearing as well as the first bearing rotates together with the rotation shaft when the first bearing is abnormal,
- further comprising a bearing operation detecting unit detecting operation of the bearing portions, wherein
- the first bearing comprises a first inner race being rotatable together with the rotation shaft, a first outer race provided on an outer periphery side of the first inner race, and a first rolling element arranged between the first inner race and the first outer race,
- the second bearing comprises a second inner race being rotatable together with the first outer race, a second outer race provided on an outer periphery side of the second inner race, and a second rolling element arranged between the second inner race and the second outer race, and
- the bearing operation detecting unit outputs bearing operation information according to rotational operation of the first outer race.
Dependencies are inferred from the claim text.