Control circuit for a vibration wave motor

Details Control circuit for a vibration wave motor Control circuit for a vibration wave motor

1989-10-10

1990-09-04

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310317, H01L 4108

Patent

active

049547410

ABSTRACT:
In a speed control circuit for a vibration wave motor, when a level of a periodic signal applied to the motor is of first level, a frequency of the periodic signal is changed between a first frequency and a second frequency to change a speed between a first velocity and a second velocity, and when the frequency reaches the second frequency, the signal level is switched from the first level to the second level and the frequency is shifted by a predetermined amount toward the first frequency and then toward the second frequency so that the speed is changed from the second velocity to a third velocity.

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patent: 4658172 (1987-04-01), Izukawa
patent: 4692649 (1987-09-01), Isukawa et al.
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patent: 4713571 (1987-12-01), Suzuki et al.
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patent: 4749896 (1988-06-01), Suzuki et al.
patent: 4794294 (1988-12-01), Shimizu et al.
patent: 4833358 (1989-05-01), Suzuki et al.

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