Method and device for driving compressor for variable-frequency air conditioner

Abstract

The invention provides a method and device for driving a compressor for a variable-frequency air conditioner. The method comprises the steps that when the compressor operates at a low speed, a torque compensation instruction value used for restraining vibration is acquired according to an actual rotating speed value of a motor in the single-rotor compressor; when the compressor operates at an intermediate speed, a q-axis voltage compensation instruction value and a d-axis voltage compensation instruction value reduce current fluctuation and are acquired according to an actual q-axis current value and an actual d-axis current value; when the compressor operates at a high speed, the step-up ratio of a power-factor adjustment circuit is automatically adjusted according to the d-axis current instruction value output through flux-weakening control; the step-up ratio is used by the power-factor adjustment circuit for increasing an output direct-current bus voltage value. According to the method and device for driving the compressor for the variable-frequency air conditioner, vibration generated when the motor operates at the low speed and current fluctuation generated when the motor operates at the intermediate speed can be reduced, the direct-current voltage can be automatically adjusted when the motor operates at the high speed, meanwhile, an optimal voltage is provided for a system, and accordingly overall efficiency of the system is improved.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a driving method and device for a compressor used in an inverter air conditioner. Background technique [0002] At present, a single-rotor mechanism is commonly used in compressors of household inverter air conditioners, that 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. In addition, with the improvement of pipeline sealing technology, ineffective refrigerant leakage is reduced to a minimum. But this has brought a kind of difficulty to the driving of the motor in the compressor: in the process of the rotor of the motor rotating one circle, the load is uncertain and changes with the change of the rotor position, and because of the aforementioned pipeline sealing technology The improvement of the refrigerant leakage reduces, wh...

AI Technical Summary

Problems solved by technology

However, the power supply voltage of the frequency conversion device used to drive this motor has not been increased proportionally

If the traditional single-phase power supply power factor correction method is still used, since the DC bus voltage is a fixed value, it cannot change with the change of the working condition of the motor, which will lead to a decrease in the overall efficiency of the actual frequency conversion control system

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