Electricity: motive power systems – Impact – mechanical shock – or vibration-producing motors
Patent
1996-12-06
1998-07-07
Stephan, Steven L.
Electricity: motive power systems
Impact, mechanical shock, or vibration-producing motors
310317, H02N 200
Patent
active
057774455
ABSTRACT:
A drive device of a vibration actuator to cause stable driving of a vibration actuator without causing the occurrence of a cogging phenomenon. In a drive device of a vibration actuator using mechanical vibrating motion of an electromechanical energy converting element which converts electrical energy into mechanical energy, the drive device includes a control circuit to output a control signal of a frequency to drive the electromechanical conversion element, a drive circuit to impress on the electromechanical conversion element an alternating voltage of the same frequency as the drive signal, and a direct current power supply to supply electric power to the drive circuit. The drive circuit has an inductive element connected in series or in parallel with the electromechanical conversion element, and a switching element to open and close at the same frequency as the control signal, connected such that the voltage of the direct current power supply is impressed thereon. The control circuit limits the range of variation of the frequency of the control signal, based on the current value which flows in the switching element.
Jones Judson H.
Nikon Corporation
Stephan Steven L.
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