Measurement of tractive force during acceleration and deceleration periods

The acceleration and deceleration ability of the train depend on the tractive force. When the wheels of the train slip on the rails, the electric torque is decreased to avoid the continuous slipping. This reason is that the tractive coefficient between the wheels and the rails has a peak at a certain slip speed. But this adhesive phenomenon is not clearly examined or analyzed. Thus we have developed a new tractive test equipment. We measured the tractive force with this equipment, and clarified the adhesive phenomenon. In this paper, the measurement results of the tractive coefficient (during the acceleration and the deceleration periods) and a discussion on the experimental results of the maximum tractive force control are reported.