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Electrically powered compressor

A technology of electric compressors and compression mechanisms, applied in the direction of single motor speed/torque control, electronic commutator, etc., can solve problems such as expensive

Active Publication Date: 2006-04-19
PANASONIC APPLIANCES REFRIGERATION DEVICES SINGAPORE
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

As a result, the method of applying three-phase sine wave alternating current is very expensive

Method used

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Embodiment Construction

[0036] Next, embodiments of the electric compressor of the present invention will be described with reference to the drawings.

[0037] 1 is a sectional view of an electric compressor according to an embodiment of the present invention, FIG. 2 is a top view of a motor stator of the electric compressor shown in FIG. 1 , and FIG. 3 is a top view of a motor rotor of the electric compressor shown in FIG. 1 , and FIG. 4 is a circuit diagram of a control device for an electric compressor according to an embodiment of the present invention, FIG. 5 is a block diagram of the control device shown in FIG. 7 is a characteristic diagram of the on / off timing and current waveform of the switching element in the control device of the electric compressor according to the embodiment of the present invention.

[0038] In FIG. 1 , in a sealed container 101 , a refrigerant 102 is sealed together with oil 103 . As the type of refrigerant 102, R600a is suitably used. A motor 115 including a stator...

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Abstract

A compressor includes a motor driven by a controller and having a rotor and a stator, a compressing unit driven by the motor in a hermetic container in which refrigerant is filled. Driving the motor at a low rpm, the controller practices a feedback control which determines a timing of turning on / off switching elements based on a signal detecting a position of the rotor, and when the motor is driven at a high rpm, the controller practices an open-loop control which outputs a given frequency and drives the motor synchronizing with the given frequency. This structure achieves a compressor working with a fewer noises in PWM driving.

Description

technical field [0001] The present invention relates to inverter driven electric compressors mainly used in domestic refrigerators or air conditioners. Background technique [0002] Brushless DC motors are highly efficient, and in recent years have been widely used in compressors and the like used in refrigeration systems. [0003] As a conventional electric compressor, the position of the rotor is detected by the counter electromotive force generated by the stator winding of the motor, and the motor is driven based on the position detection signal, and the switching element is turned off to perform PWM (Pulse Width Modulation) control (e.g. , Japanese Patent Application Laid-Open No. Hei 3-55478) is known. [0004] A conventional control device for an electric compressor will be described below with reference to the drawings. [0005] 8 is a plan view of a stator of a conventional electric compressor motor, FIG. 9 is a plan view of a rotor of a conventional electric compr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08H02P6/06H02P6/15H02P6/17
Inventor 浜冈孝二西原秀俊远藤胜己片山诚药师秀一饭塚辰幸佐伯雄二田中秀尚大内山智则
Owner PANASONIC APPLIANCES REFRIGERATION DEVICES SINGAPORE
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