Electricity: motive power systems – Impact – mechanical shock – or vibration-producing motors
Patent
1996-12-27
1998-07-07
Stephan, Steven L.
Electricity: motive power systems
Impact, mechanical shock, or vibration-producing motors
310317, H02N 200
Patent
active
057774447
ABSTRACT:
A drive device for a vibration actuator which stably drives the vibration actuator and prevents the occurrence of the cogging phenomenon. The vibration actuator provides a drive force by supplying a voltage to an electromechanical energy converting element which converts electrical energy into mechanical energy to produce mechanical vibratory motion. The drive device for the vibration actuator includes a voltage generating device to generate an alternating voltage which is impressed on the electromechanical energy converting element, and a voltage control device to control the alternating voltage of the voltage generating device such that the current supplied to the electromechanical energy converting element from the voltage generating device becomes constant. The voltage control device changes the output voltage value of the voltage generating device according to the excitation state of the electromechanical conversion element. The voltage control device controls the alternating voltage such that amplitude value, the effective value, or the average value of current supplied from the electromechanical energy converting element is constant. The drive device for the vibration actuator may also include a direct current power supply, a direct current-alternating current converter to convert the direct current voltage to an alternating voltage and to impress the alternating voltage on the electromechanical energy conversion element.
REFERENCES:
patent: 4811835 (1989-03-01), Bullivant et al.
patent: 4823054 (1989-04-01), Millauer
patent: 5136199 (1992-08-01), Kawai
patent: 5304905 (1994-04-01), Iwasaki
patent: 5432424 (1995-07-01), Takahashi
Jones Judson H.
Nikon Corporation
Stephan Steven L.
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