Delta connection of the motor and the difference between y connection

Under the small motor (4 kw) most using Y type connection,large motor usually adopt delta connection,star triangle decompression can also be used as electric motor cooling fan a large motor starting,when starting torque motor coil Y type runtime is only half of the delta connection,but the current is only starting about a third of the triangle. Triangle when starting current is rated current of 4 to 7 times,but the torque is big. Speed is the same,but different torque For ordinary three-phase electricity,the phase voltage 220 v,line voltage 380 v.Y connection is www.dongfeng-motor.com three-phase power to one end of each winding,the other end connect together. That each winding can gain phase voltage of 220 v.Delta connection is each winding end to end in order to form a triangle,three phase electricity in the Angle of the triangle. That each winding can gain line voltage of 380 v.If the phase voltage motor fan is 220 v,the rating of the motor is in y connection. If it is 380 v with delta connection.In particular,if the motor is belong to the rated voltage 380 v,you can use 220 v y connection step-down start,start to finish to switch to the delta connection