| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotor capable of reducing usage of permanent magnets composing a sensor magnet.SOLUTION: A rotor 21 includes: a first rotor core 31 in which a plurality of first claw-like magnetic poles 31b are formed on an outer peripheral part of a first core base 31a; a second rotor core 32 in which a plurality of second claw-like magnetic poles 32b are formed on an outer peripheral part of a second core base; an annular magnet 33 arranged between the first and second core bases and magnetized in an axial direction to allow the first claw-like magnetic poles 31b to function as first magnetic poles and allow the second pawl-like magnetic poles 32b to function as second magnetic poles; and a sensor magnet 42 arranged on the opposite side of the second core base to the first core base 31a, magnetized in the axial direction and having magnetic poles alternately different in a peripheral direction. The sensor magnet 42 is configured so that a plurality of permanent magnets 45 of one magnetic pole are arranged in a peripheral direction of a core member 44 to form permanent magnet magnetic pole parts, and that an iron core part 46 of the core member 44 between respective permanent magnet magnetic pole parts functions as the other magnetic pole. |
