SPEED CONTROL CIRCUIT BY FREQUENCY CONTROL OF ULTRASONIC MOTOR

Title:

SPEED CONTROL CIRCUIT BY FREQUENCY CONTROL OF ULTRASONIC MOTOR

Document Type and Number:

Japanese Patent JPH0984370

Kind Code:

A

Abstract:

To provide a speed control circuit which can control an ultrasonic motor highly efficiently with a simple circuit.

A microcomputer 1 outputs voltage suited to control frequency corresponding to required rotational speed. Pulse control frequency is generated by a frequency generating circuit 2, and an a.c. signal whose phase is different 90 degrees is applied to an ultrasonic motor 4 by an amplifier circuit 3. The rotational speed is monitored, and a comparison is made between the actual measurements and the required values of rotational speed to correct control frequency in a control frequency range stored in a storage circuit. It is thus possible to reduce the construction of a system without determining the resonance frequency of the motor for each control or processing various factors with software calculation or the like.

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Inventors:

YOSHIKAWA SEIJI
MIYAUCHI YOICHI
TAMIZU SHINYA
OKUYA TAKESHI

Application Number:

JP25937295A

Publication Date:

March 28, 1997

Filing Date:

September 12, 1995

Export Citation:

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Assignee:

KYOCERA CORP

International Classes:

G03B3/10; G02B7/28; G03B13/34; H02N2/00; (IPC1-7): H02N2/00; G02B7/28; G03B3/10; G03B13/34

Attorney, Agent or Firm:

Toshi Inoguchi

Next Patent: SOLAR GENERATOR