| 摘要 |
An alternating current electric motor or generator has a single stator, with two or more sets of single-phase, or multi-phase main field windings, together with appropriate control windings, providing interactive magnetic field systems whose effects are summated by a single rotor to produce, in one variant, a brushless equivalent of the d.c. motor and, in another variant, a brushless,functional equivalent of the three-machine, Ward-Leonard, drive system, which can be controlled by voltage adjustment alone and is suited to system enhancement by operation with associated variable-frequency inverters. Various alternative arrangements are described, having specific benefit to particular applications including those involving directly cooled or super-cooled machines; wavepower generators; industrial, direct-on-line, soft-started machines for single or multiphase supplies and high performance requirements. |
