在电力排灌中,普通结构的鼠笼式异步电动机不采取任何措施而直接投入电网启动时,由于启动电流大,而启动转矩不大,不能满足电网要求,通常均采用补偿启动器自耦减压来启动。为了使电动机能够转动起来,并很快地达到额定转速而正常工作,要求电动机具有足够大的启动转矩,但又希望启动电流不要太大。我们知道,启动电流与外加电压成正比,经过自耦变压器降压,启动电流可以减 In the power irrigation and drainage, ordinary squirrel-cage induction motor without any measures and directly into the grid startup, due to the large starting current, and the starting torque is not large, can not meet the power grid requirements are usually compensated starter auto-subtraction Press to start. In order for the motor to rotate, and quickly reach the rated speed and work properly, the motor requires a large enough starting torque, but also want to start the current should not be too large. We know that the start-up current is proportional to the applied voltage. After the autotransformer buck-down, the start-up current can be reduced