Compressor torque compensation method and apparatus, and air conditioner

A technology of torque compensation and compressor, which is applied in the control of electromechanical transmission, control of generator, motor generator control, etc. It can solve problems such as compressor out-of-step failure and excessive vibration of piping

Active Publication Date: 2016-10-12
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Failure to compensate for load fluctuations may result in excessive piping vibration or compressor out-of-step failure

Method used

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  • Compressor torque compensation method and apparatus, and air conditioner
  • Compressor torque compensation method and apparatus, and air conditioner
  • Compressor torque compensation method and apparatus, and air conditioner

Examples

Experimental program
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Effect test

Embodiment approach

[0106] As an implementation, for example, the fundamental wave component ω of the motor speed fluctuation can be extracted according to the following formula mb :

[0107] ω mb =A ωc *cos(θ / P+θ com )+A ωs *sin(θ / P+θ com )

[0108] A ωc =n*ω mrip cos(θ / P)*[1 / (1+T f *s)]

[0109] A ωs =n*ω mrip sin(θ / P)*[1 / (1+T f *s)]

[0110] Among them, n is the magnification; A ωc with A ωs is the estimated value of Fourier series coefficient; θ com is the phase compensation amount, θ com =arctan(T hf ω m ); T f is the time constant of the low-pass filter; s represents the Laplace transform.

[0111] On the basis of the above step a, further, the above step b obtains the acceleration corresponding to the fundamental wave component according to the extracted fundamental wave component, and calculates the peak torque compensation amount according to the obtained acceleration, including:

[0112] Acquire the acceleration corresponding to the fundamental wave component by usi...

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Abstract

The invention provides a compressor torque compensation method and apparatus, and an air conditioner. The method comprises the following steps: obtaining a motor rotation speed estimation value omega est; according to a motor rotation speed fluctuation value omega mrip, obtaining a peak torque compensation amount Tp; according to a motor rotation speed instruction value omega ref and the omega est, obtaining a speed regulation peak torque instruction T0; according to the Tp and the T0, obtaining a total peak torque instruction Tt; according to an AC input voltage phase theta g, obtaining a waveform variable Wf, modulating the Tt by use of the Wf to obtain a torque instruction Tref after modulation; according to the Tref and a motor torque coefficient Kt, obtaining a current instruction Iqref of a Q shaft; according to Idref, the Iqref, Id and Iq, obtaining a voltage instruction Vd of a D shaft and a voltage instruction of Vq of the Q shaft; and after performing coordinate transformation on the Vd and the Vq, outputting the transformed Vd and Vq to a motor so as to drive a compressor. According to the invention, fluctuations of the rotation speed of the compressor can be effectively inhibited.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of compressors, and in particular to a compressor torque compensation method, device and air conditioner. Background technique [0002] Due to the advantages of cost and efficiency, single-rotor compressors have been widely used in household inverter appliances. A single-rotor compressor is a mechanism in which the rotor of an electric motor drives an eccentric wheel. This single rotor mechanism can improve the cost performance of the compressor and reduce the manufacturing cost. During the rotation of the rotor of the motor, the load is uncertain and changes with the position of the rotor, especially in low-frequency operation, it is easy to cause large speed fluctuations, which affects the performance of the compressor. [0003] figure 1 A schematic diagram of the load characteristics of the compressor. Visible load torque T l The rotor angle presents periodic fluctuations, a...

Claims

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Application Information

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IPC IPC(8): H02P21/05H02P21/18
CPCH02P21/05
Inventor 张国柱
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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