Abstract
This paper addresses the issue of estimating current waveforms in a switched reluctance motor required to achieve a desired electromagnetic torque. The methodology employed exploits the recently-developed method based on the transformation from the time to the position domain. This transformation takes account of nonlinearities caused by a doubly-salient structure. Owing to this new modelling technique it is possible to solve optimization problems with reference torque, constrained voltage, and parameter sensitivity accounted for. The proposed methodology is verified against published solutions and illustrated through simulations and experiments.
Highlights
Switched reluctance motors (SRM) are widely used in various applications due to their simple design and, attractive prices
Under direct torque control (DTC), the current waveform is unknown in advance and the torque control is achieved by accelerating or decelerating the flux stator angle
It is clear that the electromagnetic part is described in terms of the resistance R and inductances Lk (θ),Mjk (θ). These parameters are available through an identification process or from modelling techniques like Finite Element Method (FEM) [12]
Summary
Switched reluctance motors (SRM) are widely used in various applications due to their simple design and, attractive prices. The doubly-salient construction, causes the motor characteristics to be nonlinear [1,2] resulting in excessive torque ripples during motion This unfavourable phenomenon is noticeable with the simplest control method where the phase currents are switched on and off in sequence. The presented approach solves the control problem only for a three phase SRM, relying on the torque profile modelled as harmonic functions. Another popular approach is to apply a torque sharing function (TSF) method. Under DTC, the current waveform is unknown in advance and the torque control is achieved by accelerating or decelerating the flux stator angle This method relies on switching voltage vectors which may result in some torque ripples. Simulation and experimental results are provided for a four-phase SRM with doubly-salient construction
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