A linear and a rotational switched reluctance drive with a large airgap are developed and manufactured for a test track of autonomous railway vehicles. The motor design, a coupled model and the results of finite-elementsimulations are presented, along with the test bed structure and measurements. The design and control objectives are to maximize the efficiency and to minimize the acoustic noise at the given motor dimensions and the output power. Index Terms–linear and rotational switched reluctance drives, propulsion, torque and efficiency maximisation
The RailCabs can group automatically as a convoy. The feasibility of such a system was demonstrated on the NBP test track. Due to the autonomous driving, convoy operation generates high demands on the propulsion system. For building convoys, thrust and braking forces have to be carefully controlled independently of the weather conditions. That is why a linear doubly-fed motor (LDFM) was chosen for the test track. Nevertheless, both technical characteristics and costs are of equal importance for a future-oriented transportation system. Two further types of linear electric motors have been considered: the linear induction motor (LIM) and the linear switched reluctance motor (LSRM). Unlike the LIM , the LSRM has not been investigated as a railway propulsion system so far. Switched reluctance motors generally offer a very simple and robust design. Thus, they are very suitable for highly reliable and faulttolerant applications. That is why the LSRM is discussed in this contribution as an alternative concept.