| 摘要 |
<p>A high speed, brushless, DC motor has a rotor (10) comprising a solid rare earth magnet core (17) magnestised diametrically. The rotor (16) includes a sleeve (18) surrounding the magnet core (17) to radially constrain the core during high speed rotation thereof. The sleeve (18) extends axially in both directions from the core to form a hollow shaft for the rotor (16). The sleeve (18) is formed of non-magnetic, low electrical conductivity material. Control circuity (14) is provided including an electronic inverter of a predetermined rating, the control circuity including means to maintain substantially constant power through the range of motor speeds from a base speed to a maximum speed while maintaining a power factor close to 1.</p> |
