Among those electrical drives, a drive concept with switched reluctance machine appears to be a promising solution for traction applications due to its numerous advantages such as robust structure, simple construction, low maintenance requirement etc. However, up to now, the utilization of switched reluctance drives in traction applications is still limited in comparison to the other types of electrical drives, because the current technology of switched reluctance drive controllers is not able to offer satisfying control quality and the performance of the same standard obtained from rotating field machines with field oriented control. In order to allow switched reluctance machine to come up with the other electrical drive concepts, a new control concept to improve the control quality and drive performance is required. This paper presents a switched reluctance machine torque controller for vehicle propulsion applications based on a novel control strategy called Direct Instantaneous Torque Control (DITC). Using DITC, the direct controllability of instantaneous torque is achieved, which leads to torque ripple minimization and good control accuracy. Control quality and drive performance are, therefore, significantly improved in comparison to the torque controller using classical hysteresis current control. DITC means that the torque is directly applied as control variable instead of phase currents. The actual instantaneous torque is calculated by an observer based on the machine characteristic. The torque command and the actual instantaneous torque are compared by a hysteresis torque controller, which generates the corresponding switching signals to deliver the desired torque. Furthermore, this paper describes and discusses the detailed functionality of DITC by using simulation and experimental results. An additional control scheme for maintaining the control linearity at high speeds is proposed at the end of this paper.
Instantaneous torque controller for switched reluctance vehicle propulsion drives
Permaneter Drehmomentregler für geschaltete Reluktanzantriebe im Fahrzeug
2003
10 Seiten, 10 Bilder, 9 Quellen
Conference paper
Storage medium
English
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