Hitachi, Ltd.

Yoshihisa Uneyama

Shigeru Machida

Masahiro Takebayashi

Yozo Nakamura

Hiroaki Hata

Masahiko Sugiyama

Akira Arai

Hiroshi Iwata

Hideo Uzuhashi

Tunehiro Endo

Naoyuki Tanaka

Kenichi Iizuka

Kazuo Sekigami

Shigetaro Tagawa

Akihiko Ishiyama

Kazuo Ikeda

Akio Sakazume

Minoru Kobayashi

Michiya Matuda

Masatsune Sutou

Takeoshi Katoh

A motor-driven compressor used as a compressor or high-pressure gas generator for a refrigerating cycle, in which the output torque of the electric motor for driving the compressor is controlled so as to make the output torque agree with the load torque required for performing compression in any revolutional angular position of the driving main shaft to thereby reduce revolutional torsional vibrations caused by disagreement between the load torque and the output torque.

Motor-driven compressor provided with torque control device

A torque control apparatus for enclosed compressors wherein a load torque, applied to an enclosed compressor, is detected by a position detector provided on the rotating portion of the compressor and a temperature detector provided in a refrigeration cycle. A voltage or current supplied to the compressor is controlled in accordance with the load torque to control the motor output torque of the compressor.

Torque control apparatus for enclosed compressors

A novel refrigerator control system is disclosed which comprises an inverter for driving a motor for a compressor, and a change-over device for driving the compressor directly with a commercial power supply when the compressor motor is not driven by the inverter.

Refrigerator control system

A horizontal compressor including an electric motor and a compressor element mounted in a case serving concurrently as an oil sump. The compressor element includes a cylinder, a shaft having a crank, a roller fitted to the crank for eccentric rotation along inner side surfaces of the cylinder, a vane moving in reciprocatory movement in a bore of the cylinder while abutting against the roller, two side plates located on opposite sides of the cylinder, one of the two side plates being formed with a suction port for a lubricant and the other side plate being formed with a discharge port for the lubricant, and a pump chamber defined by a back of the vane, the bore of the cylinder and the two side plates. The suction port is in the form of a tapering port including a small diameter portion directly adjacent the pump chamber and a large diameter portion directly adjacent the case; the discharge port is in the form of a tapering port including a small diameter portion directly adjacent the lubricant feed passage and a large diameter portion directly adjacent the pump chamber; and a space is provided at least to the suction port in a position in which the space is in communication with the small diameter portion of the suction port.

Rotary compressor with tapered valve ports for lubricating pump

Growing community of inventors

Tochigi, Japan

Yoshihisa Uneyama