Three-phase power supply multi-speed compressor and implementation control method

Abstract

The invention provides a three-phase power supply multi-speed compressor, and relates to a compressor motor. The compressor motor comprises a stator winding S1, a stator winding S2 and a stator winding S3, and the stator winding S1, the stator winding S2 and the stator winding S3 are respectively connected with a wiring terminal U, a wiring terminal V and a wiring terminal W and are connected to wiring terminals of a three-phase power supply R, a three-phase power supply S and a three-phase power supply T through a first switch. The compressor also comprises a wiring terminal U1, a wiring terminal V1, and a wiring terminal W1. And the middle sections of the stator winding S1, the stator winding S2 and the stator winding S3 in the same proportion position are respectively connected with a wiring terminal U1, a wiring terminal V1 and a wiring terminal W1 and are connected with wiring terminals of a three-phase power supply R, a three-phase power supply S and a three-phase power supply Tthrough a second switch. The invention further provides an implementation control method of the three-phase power supply multi-speed compressor. The input power of the compressor motor is changed by changing the effective resistance of the compressor motor winding.

Description

technical field [0001] The invention relates to the technical field of air-conditioning compressors, in particular to a multi-speed compressor with three-phase power supply and a control method thereof. Background technique [0002] The compressor is a necessary component in refrigeration and air conditioning (heat pump) equipment, and it is a device that converts the mechanical energy of the motor into fluid pressure energy. [0003] The existing three-phase power supply fixed-frequency compressor has only one gear speed, and its motor principle is as follows: figure 1 shown. Because there is only one set of terminals (U, V, W), the resistance values ​​of the three stator windings are all fixed, so that the speed of the motor cannot be changed, that is, the speed of the compressor cannot be changed. [0004] In the actual working process, because the speed of the compressor cannot be changed, the following disadvantages appear in the use of fixed-speed air conditioners: ...

AI Technical Summary

Problems solved by technology

[0005] 1) When the actual load demand of the air conditioner decreases, the fixed-speed compressor cannot be lowered and adjusted, and the actual load demand can only be met by starting and stopping with high energy consumption;

[0006] 2) When the actual load of the air conditioner has various states, the fixed speed compressor cannot meet the

Therefore, the variable frequency compressor with high power in the three-phase power supply cannot completely replace the fixed speed compressor

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