| 摘要 |
<p>In a rotor (7) of a brushless motor having permanent magnets, a yoke (21) is formed with plural laminated silicon steel plates (22), and, at least four, an even number of magnetic poles are provided on the outer surface of the yoke (21). For these magnetic poles, slots (25), (25) for installing field permanent magnets (30), (31) therein, are provided at equal distances from the center of the rotor every other magnetic pole. In the slots (25), (25), the field permanent magnets (30), (31) are so installed that the like magnetic poles face a rotary shaft (8). Thereby, the rotor (7) of the brushless motor can be reduced in size and has high efficiency, and the field permanent magnets (30), (31) do not break nor fly, even when the motor rotates at a high speed.</p> |
