Adjusting the Phase Switching-on Positions of the Traction Switched Reluctance Motor in the Low Speed Range

The paper evaluates the best-known approaches to adjusting the phase switching position of a traction switched reluctance motor (SRM) in order to reduce the current consumed from the power supply to provide a given value of average torque in the low-speed zone. Two fundamentally different variants of solving this problem were identified - offline and on-line optimization. Off-line optimization requires a considerable amount of preliminary work, and the results obtained are applicable only to a specific motor type or similar. Known analytical dependencies for application in on-line optimization are either inaccurate or cumbersome and inconvenient for practical use. The algorithm proposed by the authors is based on the known idea of automatic on-line control over the first peak of phase current and moving it by control means to the angular position of the beginning of overlapping of stator and rotor poles. The algorithm recommended by the authors in the implementation requires minimal computing resources of the software part of the control system because it includes only the simplest calculations. Modeling in MATLAB-SIMULINK environment showed that under various perturbations, the transition of the SRM phase inclusion position control system to a new steady state is completed in no more than three cycles of motor switching.