Protection method for preventing frequency conversion compressor from demagnetization

A variable frequency compressor, compressor technology, applied in emergency protection circuit devices, electrical components and other directions, can solve the problems of reduced reliability, poor versatility, etc., and achieve the effects of long service life, simple and reasonable structure, and expanded operating range

Active Publication Date: 2013-05-29
GUANGDONG MEIZHI COMPRESSOR
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the different types of compressors, the versatility is poor and its reliability is reduced

Method used

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  • Protection method for preventing frequency conversion compressor from demagnetization
  • Protection method for preventing frequency conversion compressor from demagnetization
  • Protection method for preventing frequency conversion compressor from demagnetization

Examples

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no. 1 example

[0030] see Figure 1-Figure 4 The protection method for preventing the demagnetization of the frequency conversion compressor includes a control chip arranged on the frequency conversion compressor, and the compressor is a ferrite frequency conversion compressor. The control chip detects the motor temperature t of the compressor, and the control chip is provided with a protection current Ipt corresponding to the motor temperature t. Usually the protection current Ipt should take into account the lowest demagnetization current, but if the value is too small, it will affect the maximum cooling capacity. However, if the value is too large, the anti-magnet function of the inverter compressor cannot be realized. For ferrite variable frequency compressors, the current protection setting value is lower than the demagnetization current value at -20°C, but the general operating temperature of variable frequency compressors is 30-110°C, and the demagnetization current of ferrite magnet...

no. 2 example

[0038] see Figure 5 , the compressor is a rare earth frequency conversion compressor, and the protection method for preventing the demagnetization of the rare earth frequency conversion compressor comprises the following steps:

[0039] 1) During the start-up phase of the compressor, query the protection current Ipt corresponding to the control chip and the motor temperature t, and judge whether the maximum start-up current Isatmax of the compressor is less than the protection current Ipt. If the maximum start-up current Isatmax of the compressor is greater than the protection current Ipt, the control chip detects in real time Compressor motor temperature t. If the maximum starting current Isatmax of the compressor is less than the protection current Ipt, the compressor will run.

[0040] 2) During the compressor operation stage, the protection current Ipt is compared with the compressor operation current Irun. If the compressor operation current Irun≤protection current Ipt,...

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Abstract

A protection method for preventing a frequency conversion compressor from demagnetization comprises a control chip arranged on the frequency conversion compressor. The control chip detects motor temperature t of the compressor and is provided with protection current Ipt corresponding to the motor temperature t. The control chip detects the motor temperature t to control maximum starting current Isatmax and running current Irun of the compressor. By means of the protection method, the control chip is utilized to detect the motor temperature t to control maximum starting current Isatmax and running current Irun of the compressor by setting the relation between the motor temperature t and the protection current Ipt of the frequency conversion compressor to achieve a demagnetization-resistant function of the frequency conversion compressor. Simultaneously, running range of the compressor is enlarged. The motor temperature t can be increased by adding a temperature rise assembly to enable the protection current Ipt to be larger than the maximum starting current Isatmax of the compressor, improve demagnetization resistance of the compressor and expand magnet application range. The protection method has the advantages of being simple and reasonable in structure, long in service life, low in cost and convenient to process and produce.

Description

technical field [0001] The invention relates to a protection method for preventing demagnetization of a variable frequency compressor. Background technique [0002] The magnetic raw materials used in existing compressors are ferrite magnets, rare earth element neodymium, iron, boron compounds and other magnetic materials. When the current exceeds the maximum current that these materials can withstand, the materials will demagnetize. [0003] see Figure 6 , the ordinate in the figure is the demagnetization current of the ferrite inverter compressor, and the abscissa is its magnet temperature. In the figure, when the temperature is -20 degrees, the minimum demagnetization current is 10APK; when the temperature is 130 degrees, the maximum demagnetization current is 24.4APK, according to Figure 6 It is concluded that as the temperature rises, the anti-demagnetization current of the ferrite inverter compressor also rises. [0004] see Figure 7 , the ordinate in the figure is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/08
Inventor 伏拥军廖四清任新杰吴多更
Owner GUANGDONG MEIZHI COMPRESSOR
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