why we use star delta connection in motor

dol starter). When we connect dol starter to above 10hp
starting time approx 6-7 times of rated current. If we using Vl=Vph/1. 732 so that in starting time it take less voltage is 1/route3rd or 1/1. 732 time so that current also less by 1/route3rd or 1/1. 732 times. After getting speed it will connecting into the delta position. current. insulation of motor also damage or burn. For star stater,the connection must have 6 cables from control panel and 6 terminals at induction ( U1,U2,V1,V2,W1,W3). To wiring the motor connection for star starter,the important thing that we must fully understand is about the basic of STAR DELTA MAGIC TRIANGLE. For detail about please read my last post about it.


From this triangle diagram,we can determine the correct phase, termination for right terminal and the rotation. As we know,the star delta stater is so tricky if we not fully understand the concept and their method. This time i want share my technique when perform wiring task and connected toPthe star delta stater for induction motor. Don`t worry,it simple and easy if we understand the basic concepts.


I explains detail step by step how to do it :D What is Star Delta connection? When we refer to this diagram,We can see correct terminal for the winding for each phase : *CAUTION : Please refer to the name plate of motor to confirm the winding numbering ( U1,U2,V1,V2,W1,W2 ) and the motor connection of winding. Why it very important?? Because each manufacturing have their own style for numbering and winding motor connection. RED PHASE : U1 and W2 YELLOW PHASE : U2 and V1 BLUE PHASE : V2 and W1 So. from this formula,we must wiring the motor follow the phase code.


We can refer the complete wiring for star delta starter diagram below. If you want change their rotation for clock-wise or anti clock-wise,you need change two of phase ( RED or BLUE) at delta contactor. I share the technique in my next post. If you want motor rotation for clock-wise,the phase colors are RED,YELLOW,BLUE. But if you want anti clock-wise rotation,the phase colors are BLUE,YELLOW,RED. For star delta control wiring diagram,please refer to my post about

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