| 摘要 |
PURPOSE:To obtain a speed controller for moving a mover stably at a specified speed, by detecting the moving speed of the moving body, and by setting a speed detecting means for generating the output of signal in proportion to a moving speed. CONSTITUTION:When a variable oscillation circuit 1 is worked and AC voltage is applied to an ultrasonic wave motor 5 via a 90 deg. phase-shifting circuit 2 and power amplifying circuits 3, 4, then a moved 14 is rotationally driven. The speed of the mover 14 is converted to the pulse signal of frequency in proportion to the speed, by a frequency generator (FG) 6, and the pulse signal is converted to DC voltage in proportion to its frequency, by an F-V converter circuit 7, and the input of this DC voltage to the circuit 1 via a compensating filter 8 is provided. The oscillatory frequency of the circuit 1 is controlled according to this veltage. Then, by the circuit 1, the oscillator frequency is changed in proportion to a speed difference between the moving speed of the mover 14 and a specified speed, and by controlling mechanical arm current, the speed of the moving body 14 is controlled to be constant. |
