| 摘要 |
1439367 Electric motors AKADEMIE DER WISSENSCHAFTEN DER DDR 9 July 1973 [21 Dec 1972] 32527/73 Heading H2A A brushless electric motor comprises rotor coils connected in series with controlled rectifiers which ensure that D.C. fields are set up by the rotor coils when currents are induced in the coils by stator coils, e.g. 52 to 55, which form part of an A.C. voltage generator, the rotor D.C. fields interacting with stator permanent magnets 51 to cause rotor rotation. The motor may be of the planar air gap type, as shown, or of the cylindrical air gap type, Fig. 14 (not shown). The stator coils are mounted on ferrite cores disposed at the boundaries between stator permanent magnet poles. The controlled rectifiers in the rotor coil circuits may be transistors, bipolar transistors or thyristors. |
