| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor rotor which brings a distribution waveform of magnetic pole magnetomotive forces closer to a sine wave without causing a dragging loss or a windage loss. SOLUTION: Each of a plurality of core plates 32 making up the rotor core 31 of a rotor 30 has: a plurality of magnet holding portions 33 each formed to hold a permanent magnet 50; and a plurality of caulking portions 35 for temporary fixing overlapping core plates 32 together. At least a pair of two caulking portions 35 is formed on the rotor outer periphery side of each set of magnet holding portions 33 each corresponding to one magnetic pole. As a result, on the outer peripheral side of each magnetic pole of the rotor 30, a permeability is made different between the vicinity of an area where the caulking portions 35 formed at least two spots overlap each other and an area except that area. Hence the distribution waveform of magnetic pole magnetomotive forces is brought closer to a sine wave. COPYRIGHT: (C)2011,JPO&INPIT |
