Ultrasonic motor and electronic device fitted with ultrasonic mo

Details Ultrasonic motor and electronic device fitted with ultrasonic mo Ultrasonic motor and electronic device fitted with ultrasonic mo

1998-12-07

2000-11-07

Ramirez, Nestor

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

318116, H01L 4108

Patent

active

061441406

ABSTRACT:
An ultrasonic motor has a piezoelectric element, a driver circuit for creating an excitation signal based on information about the excitation of the piezoelectric element, and a power supply for supplying a voltage to the driver circuit. This motor includes a voltage-adjusting circuit for adjusting the voltage supplied from the power supply to the driver circuit. The motor further includes a voltage comparison means for comparing the voltage detected by the voltage-detecting means with data about a preset voltage of the power supply and a circuit constant control means for controlling the voltage-adjusting circuit to optimize the voltage supplied to the driver circuit, for example, if the comparison made by the voltage-comparing means indicates that the detected voltage is not coincident with the data about the voltage of the power supply.

REFERENCES:
patent: 5087850 (1992-02-01), Suzuta
patent: 5146143 (1992-09-01), Furutsu
patent: 5461273 (1995-10-01), Kawasaki et al.
patent: 5493163 (1996-02-01), Nishikawa
patent: 5495152 (1996-02-01), Fukui
patent: 5500578 (1996-03-01), Kawamura
patent: 5619089 (1997-04-01), Suzuki et al.
patent: 5770912 (1998-06-01), Suzuki et al.

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