Dear all,
I have seen a type of variable speed three phase wound rotor induction motor with a small induction motor mounted on that big wound rotor motor and when the operator press a button for speed increase or decrease that small motor rotate and hence move the big motor brush position.
But i need to understand the principle of this speed control mechanism
I have seen a type of variable speed three phase wound rotor induction motor with a small induction motor mounted on that big wound rotor motor and when the operator press a button for speed increase or decrease that small motor rotate and hence move the big motor brush position.
But i need to understand the principle of this speed control mechanism