Title:
ROTATION CONTROLLER FOR ULTRASONIC MOTOR
Document Type and Number:
Japanese Patent JP3150730
Kind Code:
B2
Abstract:
PURPOSE: To accurately and stably control the speed of an ultrasonic motor with respect to variation in a load of a wide range.
CONSTITUTION: A speed command circuit 41 varies a reference DC voltage from a reference voltage generator 39 by a converted DC voltage from an amplifier 45 and outputs a DC speed command voltage. A voltage/frequency converter 47 coverts the speed command voltage into a frequency signal according to its level, and outputs it to a driving circuit 49. The circuit 49 forms a driving voltage from the frequency signal to drive an ultrasonic motor 43. A rotary encoder 59 coupled to the motor 43 generates a frequency signal according to the speed, and outputs it through a waveform shaping circuit 61. A frequency/voltage converter 63 converts the frequency signal into a DC voltage corresponding to the frequency, and the amplifier 45 feeds back the converted DC voltage to the circuit 41.
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Inventors:
Sueo Ozawa
Application Number:
JP27636691A
Publication Date:
March 26, 2001
Filing Date:
September 30, 1991
Export Citation:
Assignee:
Fukoku Co., Ltd.
International Classes:
H02N2/00; (IPC1-7): H02N2/00
Domestic Patent References:
| JP191678A | ||||
| JP1255482A | ||||
| JP1234069A |
Attorney, Agent or Firm:
Miharu Saito