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Air conditioner inverter compressor frequency-domain constant torque control system and method

A variable frequency compressor and control system technology, applied in pump control, liquid variable capacity machinery, mechanical equipment, etc., can solve the problems of large difference between current peak and peak fluctuation, shutdown, etc., achieve current stability, improve reliability, Effect of Power Consumption Reduction

Active Publication Date: 2015-06-24
HAIER GRP CORP +1
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AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a full-frequency domain constant torque control method for an air-conditioning variable-frequency compressor, which solves the problem that the peak and peak fluctuations of the current in each cycle vary greatly during the high-frequency operation of the existing air-conditioning compressor. Under the current situation, the technical problem that causes the compressor current to reach the compressor demagnetization or the current protection value of the power module to stop

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  • Air conditioner inverter compressor frequency-domain constant torque control system and method
  • Air conditioner inverter compressor frequency-domain constant torque control system and method
  • Air conditioner inverter compressor frequency-domain constant torque control system and method

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Embodiment Construction

[0026] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0027] Such as image 3 As shown: the full-frequency-domain constant-torque control system of the air-conditioning variable-frequency compressor in this embodiment includes: a current vector control unit and a constant-torque control unit.

[0028] The constant torque control part includes a pulsating current calculation unit and a current compensation command generation unit. The pulsation current calculation unit calculates the pulsation current according to the motor current, and passes the difference between 0 and the pulsation current through the current compensation command generation unit to form a current command for reducing current ripple.

[0029] Wherein, the motor current is obtained by the current sampling unit sampling the bus current of the compressor through the sampling circuit, and calculating according to the bus current an...

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Abstract

The invention relates to an air conditioner inverter compressor frequency-domain constant torque control system and method. The air conditioner inverter compressor frequency-domain constant torque control system comprises a current vector control portion and a constant torque control portion; the constant torque control portion outputs a current command which is used for reducing current pulse and adds the current command which is used for reducing the current pulse and an input signal of the current vector control portion to serve as input of the current vector control portion; the current vector control portion outputs a voltage control command to control a compressor. The improved constant torque compensation control method can be applied to a full frequency domain of a compressor; the constant torque control portion compensates currents to an input end of the current vector control portion; during a high band operation process, the currents are stable, a wave crest value at every period is uniformly distributed, the compressor stably operates.

Description

technical field [0001] The invention belongs to the technical field of variable-frequency drive control of air-conditioning compressors, and in particular relates to a constant-torque control method of an air-conditioning variable-frequency compressor in the full frequency domain. Background technique [0002] Air conditioners have become a global product. However, air conditioners account for 23% of the energy consumption of household appliances. Energy-saving technology has always been a key research topic for air conditioner companies. [0003] At present, the methods for improving the efficiency of DC inverter compressors include: [0004] 1) High-performance magnets are used to increase the magnetic flux; [0005] 2) Improve the winding method of the coil, increase the slit occupancy rate, use thick copper wire, increase the number of winding turns, etc.; [0006] 3) Reduce inductance and improve motor voltage utilization; [0007] The above method of improving the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B49/06
Inventor 王友宁程永甫刘聚科许国景
Owner HAIER GRP CORP
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