| 摘要 |
A synchronous machine with 3-phase sensors set 120° apart and 90° advanced is used to provide commutation from a direct current source. A time delay circuit with an electronically implemented algorithm controls torque by delaying the 90° advance. This delay is controlled by a linear voltage, independent of frequency, and can be used to control position, speed, or acceleration. A delay beyond 90° advance causes commutation to cease, and the alternating current machine switches to a generator, indicative of motive power being applied. If motive power ceases, the alternating current machine switches to a motor. Controlled switching can be less than half of one hertz. |
