Starting control method and control device of direct-current variable frequency air-conditioning compressor

Abstract

The invention discloses a starting control method and a control device of a direct-current variable frequency air-conditioning compressor. The control method comprises the following steps that: step 10, a controller carries out positioning control on a compressor stator so as to enable the rotor to rotate to a preset position; step 20, the controller carries out stable control on the position of the rotor, the controller controls the phase and the amplitude of the three-phase current flowing into the compressor, so as to keep the phase and the amplitude accordant with the values of the phase and the amplitude of the three-phase current when the step 10 is ended, and a preset time is lasted; and within the preset time, the magnetic field generated by the three-phase current is kept unchanged, the rotor stops vibrating and enters into the static state; step 30, the positioning is ended, the controller carries out asynchronous operation control on the rotor, so as to enable the rotor to rotate in a preset speed; and step 40, after the compressor rotor rotates in the preset speed, the controller starts to carry out closed-loop control on the position of the rotor. According to the method, the successful starting of the compressor is ensured, and the power semiconductor device damage or the demagnetization of permanent magnets in the compressor caused by current distortion is avoided.

Description

technical field [0001] The present invention relates to a start-up control method of a compressor and a control device thereof, and more specifically, to a start-up control method of a DC variable frequency air conditioner compressor and a control device thereof. Background technique [0002] At present, with the advancement of technology, more and more air conditioners begin to use DC inverter compressors. The DC inverter compressor uses a rotor with built-in permanent magnets, and does not require additional excitation current during operation. Therefore, compared with traditional fixed-speed compressors and AC inverter compressors, it has higher efficiency and makes the air conditioner more energy-efficient. [0003] In the driving process of the DC inverter compressor, in order to obtain higher reliability and efficiency, the controller of the air conditioner needs to accurately calculate the rotational position of the compressor rotor and perform closed-loop control on ...

AI Technical Summary

Problems solved by technology

This kind of distortion will cause the compressor to fail to start if it is light, and if the current is too large, it will cause damage to the power semiconductor device driving the compressor in the controller or demagnetization of the permanent magnet in the compressor, which needs to be avoided.

The existing technology is to adjust the length of time required for the positioning phase and the size of the target current value at the end of the positioning, so that the positioning action occurs during the positioning process, but the implementation effect is not ideal

[0012] Based on the above description, there is an urgent need for an effective start-up control method and control device for DC inverter air conditioner compressors. This method can be used to ensure stable and reliable start-up of the compressor, and to eliminate power semiconductor device damage or compressor damage caused by current distortion. Disadvantages of medium permanent magnet demagnetization

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