| 摘要 |
PCT No. PCT/CH93/00274 Sec. 371 Date Aug. 23, 1994 Sec. 102(e) Date Aug. 23, 1994 PCT Filed Dec. 7, 1993 PCT Pub. No. WO94/14219 PCT Pub. Date Jun. 23, 1994In the device, an electric motor is designed as a brushless, electronically commutated pancake motor (201) with permanent magnets arranged on the rotor and coreless windings arranged on the stator. Each winding is provided with a pair of terminals which can be connected in each case via a controllable switch at least to each phase conductor of the alternating power supply and to each other via a further controllable switch. In a device with pick-ups, the instantaneous voltage between one phase conductor each and a neutral conductor or another phase conductor of the alternating power supply, the instantaneous voltage between the two terminals of at least one pair of terminals, and also the instantaneous current in one winding each are repeatedly sampled. The sampled instantaneous voltages or currents are compared with one another and with corresponding threshold values in order to control the switches in dependence on the instantaneous result of the comparisons. The device allows a reversible conversion and storage of electric energy from an a.c. power supply into kinetic energy of an electric motor. |
