The winding limit of the transit motor can be 2-3 times. In actual wiring, the rated current, rated voltage, load characteristics and other factors of the motor should be comprehensively considered, and the appropriate number of windings should be selected. Generally speaking, 2-3 turns of the middle line can meet the protection requirements of most motors. If higher protection sensitivity is needed, the number of windings can be appropriately increased, but care should be taken not to excessively increase it, so as not to affect the normal operation of the motor.