| 摘要 |
Electrically compensated constant speed drives have been proposed in which permanent magnet machines used in the speed compensation link of the drive have been employed to start a prime mover connected to the drive. However, these machines operate over widely varying speed ranges when in the starting mode, as opposed to the normal generating mode. This in turn leads to an increase in the size and weight of the drive. In order to overcome this problem, an electrically compensated constant speed drive includes controllable gear boxes (27, 35) in the speed compensation link of the drive which permit the overall speed ranges of the permanent magnet machines (PMM1, PMM2) to be controlled, thus leading to a desirable decrease in size and weight of the machines. |
