| 摘要 |
PURPOSE:To control the speed of a motor without using a rotation sensor by controlling in response to a deviation signal obtained by butting a rotating speed command signal and an inducting electromotive force. CONSTITUTION:Voltage component detectors 9, 10 respectively detect the 2-axis components et', em' of the voltage of a motor 2. The signal em' is applied together with an output command signal 100 from a rotating speed instructing circuit 3 to an adder 11, and input to an oscillator 12, thereby controlling a frequency f1. An amplifier 13 controls a current command im' in response to a deviation between the output signal of the amplifier 11 and the signal et' to maintain the magnetic component phim' at the prescribed value. Further, the output signal from the circuit 3 and the signal et' are butted, the effective current command l* is varied in response to the deviation, thereby controlling the rotating speed in response to the command value. |
