Due to the potential of the DC traction motor, we need to reduce the value of the reactance electromotive force. In order to obtain a good commutation, when designing the traction motor, it is desirable to have the value of the electromotive force as small as possible, thus offsetting the commutation electromotive force required for the electromotive force. It will be smaller. When the absolute values of the two electromotive forces are reduced, their residual electromotive force is also reduced accordingly, thus reforming the commutation condition of the motor. Due to the reduction, the corresponding reduction is also made. In the case where the commutating pole air gap is small, the magnetic circuit is also ensured to be in a low saturation state, so that the load can be better offset within the load variation range.
