| 摘要 |
<p>A synchronous motor comprising a permanent-magnet rotor (18) and a stator (12) which, at start-up, uses rectifiers (48,52) for supplying the stator coil (10) with rectified current and a commutator (26) comprising a rotary member (22) and fixed elements (28,30,32), the rotary member (22) being axially displaceable (70) under the action of a centrifugal mechanism against a spring to disengage it from the fixed elements (28,30,32) when the rotor approaches synchronous speed and thereby connect the stator coil (10) directly with the AC supply (44).</p> |
