DRIVE CIRCUIT FOR VIBRATION TYPE ACTUATOR

Japanese Patent JP3893795

B2

PROBLEM TO BE SOLVED: To control drop in drive efficiency for variation of load by providing a control circuit which generates, with a self-oscillating operation, an application voltage for which an reverse electromotive force generated in electro-magnet coil due to the reciprocal movement of rotor is positively fed back.
SOLUTION: A DC resistance R and the inductance of a stator winding 1 and reverse electromotive force are considered as a serial circuit and the other circuit except for a capacitor 13 is considered as a control circuit 10. Since a reverse electromotive force is generated, when the magnetic flux of a permanent magnet passes a stator winding 1 when a rotor moves, a sine wave signal corresponding to the number of vibrations of moving portion is generated. This signal is applied to a non-inverted input terminal of an operational amplifier 11 and is then positively fed back to generate the self-oscillating operation. Since this frequency depends on the number of vibrations of mechanical system, if the load changes, the energizing voltage of the frequency depending on the load variation is applied to the stator winding 1. A resonance system required for oscillating operation is used as the vibration type linear actuator, to provide high efficiency drive, and the resonance system can be omitted, so that the number of item parts can also be reduced.

Harry Suha
Hideaki Abe
Nakayama Satoshi
Okamoto Toyokatsu

JP11572299A

March 14, 2007

April 23, 1999

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MATSUSHITA ELECTRIC WORKS,LTD.

H02P25/06; H02K33/04; H02K33/10; H02P7/00; (IPC1-7): H02P7/00; H02K33/04; H02K33/10

JP55087122A
JP7060188A
JP9126145A
JP9195949A

Keisei Nishikawa
Atsuo Mori

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