What is the difference between star and delta connection for

What is the difference between star and delta connection for rotor of ring slip motor?
Revolving joints motors have stator with star connection and star or delta connection in rotor, and the resistance starter in star connection? waht is the difference?
I know that if I connect star Iline= I phase, but when I connect delta I line= 1.7 I phase, so why I connect delta for rotor, and for carbon brushes and resistance starter, what is the difference, if the rotor connected delta or star? through bore slip rings
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