Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1990-06-29
1991-10-01
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310316, 310328, 318116, H01L 4108
Patent
active
050536699
ABSTRACT:
An ultrasonic motor is provided in which a detector will detect the amplitude of a traveling wave generated on the stator. An oscillator approximates frequency of the travelling wave with respect to the resonance frequency of the stator while the amplitude of the traveling wave is decreased. If the oscillator approaches the frequency of the traveling wave to the resonance frequency of the stator, the amplitude of the traveling wave can be maintained against increasing pressure of the increased torque load of the ultrasonic motor.
REFERENCES:
patent: 4240141 (1980-12-01), Vasilieu et al.
patent: 4275363 (1981-06-01), Mishino et al.
patent: 4562374 (1984-05-01), Sashida
patent: 4794294 (1988-12-01), Shimizu et al.
patent: 4937488 (1990-06-01), Fujie et al.
patent: 4959579 (1990-09-01), Kuwahara et al.
Aoyama Mutsuro
Kuwabara Yasuo
Okada Shoji
Saeki Takao
Aisin Seiki Kabushiki Kaisha
Budd Mark O.
Dougherty Thomas M.
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