Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1989-05-03
1990-05-15
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310323, H01L 4108
Patent
active
049260847
ABSTRACT:
Disclosed is a driving apparatus for a vibration wave motor in which monitor means is provided for detecting the vibrating state of the vibration wave motor and the difference between the resonance frequency and the frequency of a driving AC signal is detected on the basis of the phase difference between the output signal from the monitor means and the driving AC signal and when the frequency difference is great during the change of the number of revolutions of the motor, the vibration rate of the frequency of the driving AC signal is made greater to improve the responsiveness while, on the other hand, when the frequency difference is small, the variation rate of the frequency of the driving AC signal is made smaller to thereby prevent the occurrence of an unstable operation in which the frequency of the driving AC signal exceeds the resonance frequency to cause sudden stoppage of the motor.
REFERENCES:
patent: 4510411 (1985-04-01), Hakamata et al.
patent: 4713571 (1987-12-01), Suzuki et al.
patent: 4727276 (1988-02-01), Izukawa et al.
patent: 4743788 (1988-05-01), Takagi et al.
patent: 4748365 (1988-05-01), Poupaert et al.
patent: 4812699 (1989-03-01), Ogawa et al.
patent: 4833358 (1989-05-01), Suzuki et al.
patent: 4853579 (1989-08-01), Kawasaki et al.
Furutsu Etsuro
Izukawa Kazuhiro
Budd Mark O.
Canon Kabushiki Kaisha
LandOfFree
Driving apparatus for a vibration wave motor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Driving apparatus for a vibration wave motor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Driving apparatus for a vibration wave motor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-623198