Squirrel-cage asynchronous motor step-down starting method control circuit

Squirrel-cage asynchronous motor step-down starting way has a string of stator winding resistance ( Or reactance) Step-down start, star a triangle step-down start, since the lotus root transformer step-down start and use the soft starter, etc. Stator winding resistance concatenated step-down starting on the resistance of heat loss, such as reactor volume, cost and larger, so the method is seldom used. The characteristics of the autotransformer step-down starting way: autotransformer step-down started the advantage is that can allow the starting current and starting torque required for to choose from different coupling transformer tap achieve step-down start, and regardless of the stator winding of the motor or delta Y method can be used. Faults are bulky equipment, invest in more expensive. A triangle star step-down start the biggest advantage is simple equipment, low prices, thus obtains the widespread application. Defect is only for normal run time for delta connection, buck than fixed, sometimes can not meet the requirement of the launch.