Mitsubishi Denki Kabushiki Kaisha

Osamu Yatsuki

Sotsuo Miyoshi

Yuji Nakahara

Toshihiko Miyake

Youichi Fujita

Tetsumasa Asano

Kazuyuki Fujimoto

Harutoshi Hashimoto

A valve device comprising a stator having a predetermined number of coils arranged with substantially equal intervals in peripheral directions of a stator core, a rotor having a plurality of permanent magnet magnetic poles at positions corresponding to the coils on an outer peripheral surface of the stator a current carrying means commutating a direct current supplied from a power source through the rotor and applying the current to the coils of the stator a shaft member located in a center of the rotor and being movable in a direction of the shaft in response to rotation of the rotor and a valve member opening and closing by movement of the shaft member for providing excellent responsiveness of valve opening and closing operations.

Valve device

A speed control apparatus includes a plurality of switches disposed between a three phase AC power source and a motor, a low speed control device for feeding power having a frequency lower than the frequency of the power source to the motor under the turn-on control of the switches, and a phase shifting device for shifting the phase order for changing from high speed operation to low speed operation of the motor.

Speed control apparatus

Growing community of inventors

Tokyo, Japan

Osamu Yatsuki