The selection of contactor electric control system design

 Is used to contact with a load of main circuit connected or cut off automatically. acmotortrading.blogspot.com Points and two types of ac and dc, ac contactor is most used in machine tool. Choose contactor mainly consider the following technical data: (1) the types of power supply: ac or dc. squirrel cage induction motor (2) the main contact 3 phase induction motor rated voltage, rated current; (3) the auxiliary contact type, number and contact of rated current; (4) the power of electric motor parts the electromagnetic coil type, frequency and rated 3 phase induction motor voltage; (5) the rated operating frequency (b/h), which allowed through to the most single phase induction motor times per hour. Main contact rated current, generally calculate according to the motor capacity Pd three phase induction motor contact permanent magnet generator generator current Ic, namely: the electrical control system design - the conversation of the heart - the heart of the dialogue. Type: constant K experience, usually take 1 ~ 1.4; Pd motor generator power (kW); Ud motor rated line voltage (V); ac motors Ic contactor main contact current (A);