Control device for a vibration wave motor

Details Control device for a vibration wave motor Control device for a vibration wave motor

1991-06-25

1992-10-27

Ip, Paul

Electricity: motive power systems

Positional servo systems

Frequency- or phase-modulated systems

318114, 318115, 318118, 310316, 310323, 310328, H01L 4108

Patent

active

051592533

ABSTRACT:
The present invention relates to a vibration wave motor of the type in which an electro-mechanical energy conversion element is disposed on a vibration member and a frequency voltage is applied to the element to form a travelling vibration wave on the vibration member and a moving member is driven by the vibration wave. In the present invention, when the motor has assumed a resonance or the vicinity thereof when speed adjustment is being effected with the frequency of the periodic voltage changed, the change of the frequency to any frequency exceeding the then frequency is inhibited so that the drive frequency is not changed to a value exceeding the resonance frequency.

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