Matsushita Electric Industrial Co., Ltd.

Nobukazu Sugano

Ritsuo Inaba

Hiromi Tanoue

Toru Kishi

Yukihiro Matsuyama

Horiyuki Harao

Ken-ichiroh Takahashi

In a driving apparatus for ultrasonic motor, a variable oscillator (44) varies oscillating frequency responding to current level of detected current which flows to a piezoelectric member (1, 2) and is in proportion to mechanical vibration of the piezoelectric member (1, 2) when mechanical resonance frequency varies by change of environmental condition.

Driving apparatus for ultrasonic motor

An improved clutch motor arrangement to be used, for example, for driving industrial sewing machines and the like, which is provided with a detection device for detecting functioning of a clutch mechanism and a control device for controlling voltages to be applied to the motor, and arranged to lower the impressed voltage during non-load operation of the motor to a minimum necessary value required for the motor to rotate at a speed in the vicinity of synchronous speed for reducing power consumption during the non-load operation.

Clutch motor arrangement

Growing community of inventors

Toyonaka, Japan

Nobukazu Sugano