Three-phase asynchronous motor actiyator and its speed regulation method, air conditioner using the same

Abstract

The invention relates to three-phase asynchronous motor speed regulation controller comprised a heavy-current detection and output motor drive board and a weak-current control board and used in control system of electromechanical device with a system master control board. Wherein, the said drive board communicates with said weak-current control board that also communicates with said master control board; the drive board can detect three-phase power over zero point and output variable voltage, the control board can control dual-direction silicon controlled conductive angle. This invention can reduce motor rotation speed for low load to save power.

Description

【Technical field】 [0001] The invention relates to the field of motor speed regulation control, in particular to a three-phase asynchronous motor speed regulation controller and a speed regulation method thereof. The invention also relates to an air conditioner using a speed-regulating controller of a three-phase asynchronous motor. 【Background technique】 [0002] Three-phase asynchronous motors are widely used, including air conditioners, washing machines, etc. in daily life, and cranes, injection molding machines, etc. in industrial fields. The existing three-phase asynchronous motors generally cannot be adjusted in speed, so that the speed range is small, which is not convenient for reasonable control equipment; for example, in the existing air-conditioning system, the wind speed of the external fan is fixed in several gears, and the speed range is small. The load of the unit and the required load of the indoor unit, and the heat transfer capacity of the outdoor heat exch...

AI Technical Summary

Problems solved by technology

The existing three-phase asynchronous motors generally cannot be adjusted in speed, so that the speed range is small, which is not convenient for reasonable control equipment; for example, in the existing air-conditioning system, the wind speed of the external fan is fixed in several gears, and the speed range is small. The load of the unit and the required load of the indoor unit, the heat transfer capacity of the outdoor heat exchanger and the heat transfer capacity of the indoor unit heat exchanger cannot be well matched, which affects the reliability and stability of the unit operation

The speed that can be adjusted is also adjusted by the frequency converter, because the cost of the frequency converter is relatively high, which makes the cost of the entire control system that controls these devices too high

As we all know, the chopper circuit voltage regulator applied to the single-phase motor is a low-cost governor, but because the operating characteristics of the three-phase induction motor are greatly affected by the load, the chopper circuit regulator has not yet been used. Mature application in speed regulation of three-phase induction motors

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