A traction control method for slip suppression of electric locomotives driven by parallel-connected dual induction motors controlled by one inverter

The multiple main motor drive system for railway vehicles is more excellent than another circuit system of one inverter and one induction motor, from the viewpoint of cost and space-saving of electric equipment. On the other hand, the motors fed by one inverter are controlled collectively. As a result, when re-adhesion control is executed, the traction force and vehicle acceleration of the former system may be low in comparison with those of the latter system, the individual main motor drive system. This paper explains the development of a traction control method designed so as to increase the tractive effort of a multiple traction motor drive locomotive (main circuit systems consisting of parallel-connected induction motors). To verify the effectiveness of the control method, simulation tests and experiments were performed.