Control system for pole-changing-motor-driven compressor
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsJiro Yuda, Hiroshi Morokoshi, Michimasa Hori, Mitsuhiro Ikoma, Takeshi Aizawa
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Abstract
A control system for a compressor driven by a pole-changing motor comprises a pole changer for the motor, a contactor for stopping the motor for a predetermined time in case of the pole changing, and a switch responsive to the variation in a physical quantity which occurs in the compressor every time when the latter is stopped, whereby the motor is stopped in case of the pole changing and then is started again in response to the actuation of the switch. This control system is especially adapted for use in a pole-changing-motor-driven compressor used in a refrigeration cycle of an air conditioner.
Claims18
A control system for a motor-driven compressor, comprising:
- a. a two-speed motor capable of driving said compressor, at a high speed and at a low speed,
- b. first control means for changing the speed of said motor and for temporarily interrupting the power supply to said motor during said speed changing, thereby stopping said compressor,
- c. electrical switching means coupled to said compressor, said switching means having a first position for a predetermined time interval after said compressor has stopped, and a second position after said predetermined time interval has expired,
- d. second control means including a self-latching circuit actuable in response to an electrical signal from said switching means to couple said power supply to said motor,
- said motor remaining stopped during said speed changing, being enabled to start again after said predetermined time interval of said switching means, and being supplied with power regardless of the position of said switching means once said motor is started again.
A control system for a two-speed motor-driven compressor, comprising:
- a. first solenoid operated relay means for causing speed changing of a two-speed motor for driving said compressor,
- b. first switching means for stopping said motor for a predetermined time interval during said speed changing,
- c. second switching means actuable in response to the variation in a physical parameter caused by the stoppage of said compressor, and
- d. second solenoid operated relay means actuable in response to the actuation of said second switching means for establishing a self-latching circuit, said first solenoid operated relay means interrupting the power supply to said motor for said predetermined time interval during said speed changing and thereafter causing said motor to be driven again in response to the actuation of said second switching means.
Dependencies are inferred from the claim text.