Skid prevention for EVs based on the emulation of torque characteristics of separately-wound DC Motor

It is well-known that the separately-wound DC motor has effective torque (current) reduction characteristics in response to rapid increase of the rotational speed of the motor. This characteristics has been utilized in adhesion control of electric locomotives with DC motor. In this paper, how to realize a new skid prevention method for EVs utilizing this characteristics is mentioned. In order to compensate for Back-EMF, disturbance observer is introduced. By selecting the time constant or observer gain properly, the torque (current) reduction characteristics can be adjusted freely in some range. The experimental results of the hardware skid simulator utilizing Motor-Generator setup verified the effectiveness of our proposed method.