Some single phase ac motor with a capacitor,capacitance is started.And some of the single phase ac motor has two capacitance,A startup capacitor,running capacitor.Starting and capacitance of the generally fall into two kinds of operation.Used for mechanical capacitor start simply. Small blower fan and also is single phase motors,they are running capacitor.Only one winding electric fan motor parts single-phase ac motor,the rotor is rat The cage.Single phase electricity does not produce a rotating magnetic field.In order to make the single phase electric function automatically spin,we can add a starter in the stator winding Groups,starting with the main windings in space acmotortrading.blogspot.com by 90 degrees,starting winding to concatenate a suitable capacitance,made with the main current in winding In the phase approximation is 90 degrees,namely so-called split-phase principle.
These two differ 90 degrees of electricity flow in time into the two differ in space Winding of 90 degrees,stator winding machine will be produced in the space (two-phase) rotating magnetic field,under the effect of the rotating magnetic field,the rotor can be automatic starting,up Move after the operation of single-phase capacitance in circuit according to the capacitance motor.With two big motor capacitor,start low capacitance pressure can reduce the cost. Start up large capacitor is out of work,it won't burned because of low pressure,with a large capacity of high voltage and large capacitance increases Higher capacitance pressure big cost,but the capacity is small,it is hard to start small motor don't need a lot of capacitor,so only a circuit Jane to do so The bill.Whatever the capacity,at the beginning of the motor starting has a starting role.But when the motor reaches about 75% of the rated speed,the starter Didn't automatically disconnect by centrifugal switch capacitance,and continue to work with motor running capacitor.
