| 摘要 |
<p>PURPOSE:To eliminate the phase offset by fixing the phase control voltage at a voltage level where a controlled system works at a prescribed speed and with a prescribed phase while the speed offset is corrected automatically. CONSTITUTION:A controller for speed and phase of a motor 1 is provided with a rotary phase detector 2, a frequency motor 3, a pulse generating circuit 4, a trapezoidal wave generating circuit 5, a sample and hold circuit 6, a reference phase generating circuit 7, a speed control circuit 8, a D/A converter 9, a phase compensating circuit 10, an addition amplifier 11 and a motor driving circuit 12. Then a switch 25 and a voltage source 26 are added, and the switch 25 is controlled by the speed correction signal ST given from the circuit 8. Then the switch 25 is closed by the signal ST through a starting speed switching action, etc. Thus the phase control voltage VP' serving as the input to be given to the amplifier 11 is fixed at 1/2 power supply voltage by the voltage of the source 26. While the circuit 8 performs an automatic correcting action of the speed offset so that the speed offset of a speed control loop is set at zero.</p> |
