Abstract :
This paper describes the use of electrical machines as the prime mover in railway locomotives and vehicles. First, the loading of traction machines is examined from knowledge of vehicle movement dynamics within the traction duty cycle. Then the operation of the principal types of traction machine - DC, synchronous and induction (asynchronous) motors - is described, and their steady-state torque-speed characteristics are explained by means of electrical circuit models. Finally, the various machines are compared electrically, mechanically and economically
