| 摘要 |
PCT No. PCT/FR88/00198 Sec. 371 Date Oct. 20, 1989 Sec. 102(e) Date Oct. 20, 1989 PCT Filed Apr. 22, 1988 PCT Pub. No. WO88/08477 PCT Pub. Date Nov. 3, 1988.Regulation of the speed of an electric motor is accomplished by counting the number of periods of AC current and modulating the pulses supplied to the motor. The speed of the motor is regulated according to a speed reference curve. The technique is especially suitable for operating a motor which controls a door. |
