Method for controlling direct-current (DC) frequency conversion air condition compressor

Abstract

The invention discloses a method for controlling a direct-current (DC) frequency conversion air condition compressor. The method comprises two position estimation methods, namely a position estimation method A and a position estimation method B. The two position estimation methods are used and changed over as follows: in the process of starting and accelerating of the compressor, the position estimation method A is adopted when the compressor starts, after being started, the compressor starts to accelerate, when the revolving speed of the compressor is less than and equal to V1, the position estimation method A is still adopted, and when the revolving speed of the compressor is greater than V1, the position estimation method B is adopted; after the compressor runs at an intermediate speed or a high speed for a period of time, demands for system cooling or heating are reduced, at the moment, the compressor starts to speed down, in the process of speeding up, the revolving speed of the compressor is greater than and equal to V2, the position estimation method B is adopted, and when the revolving speed of the compressor is less than V2, the position estimation method A is adopted, wherein V1 is greater than and equal to 360 rpm (revolutions per minute), and less than and equal to 1200 rpm, and V2 is greater than and equal to 180 rpm, and less than and equal to 600 rpm. The DC frequency conversion air condition compressor has the characteristics of flexibility in operation and good comfort.

Description

technical field [0001] The invention relates to a DC frequency conversion air conditioner, in particular to a control method for a DC frequency conversion air conditioner compressor. Background technique [0002] Due to the advantages of small size, high efficiency, wide speed range and reliable operation, permanent magnet synchronous motors are widely used in fields requiring high-performance electric drive control systems. DC inverter air conditioner has occupied a dominant position in air conditioner products at present, and the motor in the compressor, its core component, is a permanent magnet synchronous motor. What we often say about compressor control is actually to control the motor inside the compressor. [0003] In order to realize the high-performance control of the permanent magnet synchronous motor system, it is essential to know the position signal of the rotor in the permanent magnet synchronous motor. The position signal of the rotor is usually detected by a...

AI Technical Summary

Problems solved by technology

[0007] The working principle of the high-frequency signal component method is to estimate the position signal of the rotor by using the spatial saliency effect of the motor rotor. When the high-frequency signal component method controls the motor, the effect will become worse or even fail.

For this reason, most of the high-frequency signal component methods used in motor control are in the stage of laboratory theoretical research, and basically have not been applied to any actual products.

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