| 摘要 |
<p>A motor rotor (22) of the invention is constituted by a motor shaft (30), a permanent magnet (319 surrounding the motor shaft (30) around an axis, a pair of end rings (32, 32) surrounding the motor shaft (30) around the axis and sandwiching the permanent magnet (32) from both sides in an axial direction, and a hollow cylindrical outer sleeve (33) fitted to the permanent magnet (31) and a pair of end rings (32) in accordance with a stationary fit. A longitudinal elastic modulus of the end ring (32) is larger than a longitudinal elastic modulus of the permanent magnet (32). A thickness of the outer sleeve (33) is different in correspondence to a position in the axial direction in such a manner as to uniformize a circumferential stress applied to the outer sleeve (33) fitted to the permanent magnet (32) and a pair of end rings (32) in the axial direction.</p> |
