| 摘要 |
PURPOSE:To increase the gain of a speed system by employing a phase frequency comparator as a speed control circuit. CONSTITUTION:A signal from a frequency generator 14 provided at a motor 13 is inputted through an FG amp, a frequency comparator 17 to a speed system phase comparator 18, thereby producing an error signal of the speed system and speed system phase error signal. The output of the comparator 17 is used as an error signal until the motor 13 reaches the prescribed speed, and when the motor 13 reaches the prescribed speed, the output signal of the comparator 18 is used as an error signal of a speed controller 16. After the error signal of the phase system in response to the phase of the motor 13 form the phase control circuit 21 and the error signal from the speed controller 16 are mixed by a mixer 23, it is inputted to a motor drive circuit 24, thereby controlling the rotation of the motor 13. |
