Rotor and motor
AssigneeMitsubishi Electric Corporation
InventorsYuichiro Nakamura, Koji Shimomura, Yu Hirotani, Kenta Setaka
Life of this patent
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Abstract
A rotor includes a rotor core, first magnetic poles that respectively include a plurality of permanent magnets and have a first polarity provided by the permanent magnets, and second magnetic poles that are each formed between the permanent magnets adjacent to one another and are salient poles having a polarity different from the first polarity. θim and θis satisfy the relation θim>θis. θom and θos satisfy the relation (θom×1.1)≥θos≥(θom×0.9). The rotor thus obtained can suppress increase in cogging torque while suppressing decrease in torque.
Claims8
A rotor comprising:
- a rotor core;
- first magnetic poles disposed on the rotor core in spaced relation to one another in a circumferential direction along a periphery of the rotor core, each of the first magnetic poles including a permanent magnet and having a first polarity provided by the permanent magnets;
- and
- second magnetic poles formed in a circumferential direction spaced apart along the periphery in the rotor core, each of the second magnetic poles being between the permanent magnets that are adjacent to one another, the second magnetic poles being salient poles having a polarity different from the first polarity, wherein
- a radial center of the rotor core is a center,
- a line connecting the center and a first edge of a radially outer side of each of the permanent magnets and a line connecting the center and a second edge of the radially outer side of each of the permanent magnets form an angle θom,
- a line connecting the center and a first edge of a radially inner side of each of the permanent magnets and a line connecting the center and a second edge of the radially inner side of each of the permanent magnets form an angle θim,
- a line connecting the center and a first edge of a radially outer side of each of the salient poles and a line connecting the center and a second edge of the radially outer side of each of the salient poles form an angle θos,
- a line connecting the center and a first edge of a radially inner side of each of the salient poles and a line connecting the center and second edge of the radially inner side of each of the salient poles form an angle θis,
- the angle θim and the angle θis satisfy the relation θim>θis, and
- the angle θom and the angle θos satisfy the relation (θom×1.1)≥θos≥(θom×0.9) that includes a value in which cogging torque is minimized.
Dependencies are inferred from the claim text.