ELECTRONIC EXPANSION VALVE AND CONTROL METHOD THEREOF

摘要

An electronic expansion valve of an air-conditioning system, comprising a valve body (1) and an expansion valve controller; the valve body (1) comprises a refrigerant channel, a valve pin (14), and a stepping motor; the stepping motor controls the movement of the valve pin (14) to adjust the size of the opening of the refrigerant channel; the expansion valve controller outputs different control signals according to different operation conditions of the electronic expansion valve; inputting different current to the stepping motor so as to drive the stepping motor to rotate; and controlling the movement of the valve pin (14) to adjust the size of the refrigerant channel. The electronic expansion valve employs different current to drive a stepping motor according to different operation conditions, thus reducing system energy consumption, overcoming abnormal fault of the motor, and extending the service life of the electronic expansion valve.