Air conditioner, compressor, and closed-loop zero-speed start method and system for compressor

Abstract

The invention discloses an air conditioner, a compressor, and a closed-loop zero-speed start method and system for the compressor. The method comprises the following steps: injecting a high-frequency voltage signal to the compressor when the compressor is started, so as to estimate the initial position of a compressor rotor; carrying out the initialization of a magnetic flux observer and a phase locking ring of the compressor according to the initial position of the compressor rotor; estimating the real-time position of the compressor rotor through the initialized magnetic flux observer and phase locking ring after the compressor enters a closed-loop control state, so as to carry out the vector control of the compressor. The method can achieve the full-process position closed-loop start of the compressor, can reduce the amplitude of the start current of the compressor, and achieves an effect of energy consumption reduction.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a closed-loop zero-speed startup method for a compressor, a closed-loop zero-speed startup system for a compressor, a compressor and an air conditioner. Background technique [0002] Due to the advantages of energy saving and comfort, inverter air conditioners driven by permanent magnet synchronous motors have gradually become the mainstream of the market. Through vector control technology, permanent magnet synchronous motor can achieve good driving efficiency and noise level. Vector control needs to use the rotor position information of the permanent magnet synchronous motor. Considering the cost and reliability, the compressor cannot be equipped with a position sensor, and its rotor position is generally obtained by position estimation algorithms such as the extended back EMF method and the flux linkage observation method. Moreover, the position estimation method adopted ...

AI Technical Summary

Problems solved by technology

Although this method can make the compressor start reliably, because the rotor position of the compressor is unknown during the positioning and open-loop start-up process, it is impossible to accurately give the motor current command

On the one hand, this will lead to a relatively large starting current of the compressor, which will increase the power consumption of the compressor; on the other hand, there will be obvious vibration and noise during the starting process of the compressor.

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