Three-phase asynchronous motor connection

380 v with star connection,the 220 v with delta connection.The above refers to the line voltage,in the star connection www.dongfeng-motor.com of 380 v,line voltage is 380 v,the phase voltage is 220 v,namely winding voltage of 220 v.If change to delta connection,the phase line voltage is 380 v,winding voltage is 380 v,makes the motor burn,so can't delta connection.2 for 220 v delta connection,instead of star connection,the phase voltage is 220/1.73 = 127 v low voltage,start is not normal. So also not line.And under the condition of high power (> 3 kw),then you rotor balancing machine can use the above method,the step-down start,in order to reduce the starting current.In conclusion,mainly considering the strength of the 8500w gasoline generator winding.