What's the use of two copper rings externally connected by the two poles of the motor?
According to the starting mode of the motor, there is basically a capacitor, phase shift start, there are two "copper ring" (short circuit ring) start.Three phase motor, serial motor without starting device.
That's the starting coil. Without it, the motor won't turn.
It is a pole coil, and its function is the same as that of the starting winding: starting action.
That is called a cover machine, only a small power single-phase motor is used, rather the starting winding, you can save the capacitor
