| 摘要 |
<p>Prior electrically compensated constant speed drives (ECCSD's) (10) have included a single power transmission path between a prime mover (12) and a load (14) driven thereby which handles large amounts of control power, thereby leading to inefficiencies and complexity in the controls for the drive. In order to overcome this problem, an ECCSD (10) according to the present invention includes a pair of power transmission paths (16, 18) between the prime mover (12) and a load (14) wherein each power transmission path includes a mechanical differential (20, 40) having a first input (N2, N3) coupled to the output (N1) of the prime mover (12) and an output (N4) coupled to the load. A second input (30, 50) of each of the differentials (20, 40) is coupled to a permanent magnet machine (PMM1, PMM2) and a power converter (70) interconnects the electrical power windings of the permanent magnet machines (PMM1, PMM2). In operation, one of the permanent magnet machines (PMM1) is always operated as a generator while the other permanent magnet (PMM2) is operated as a motor so that power flow through the power converter (70) is unidirectional. The ECCSD (10) of the present invention results in a substantial reduction in the maximum control power and hence efficiency is increased and complexity is reduced.</p> |
