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Influence of modified rotor geometry on torque ripple and average torque of a 6/4 Switched Reluctance Motor

Influence of modified rotor geometry on torque ripple and average torque of a 6/4 Switched Reluctance Motor,Torsten WICHERT

Influence of modified rotor geometry on torque ripple and average torque of a 6/4 Switched Reluctance Motor  
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Among others, high torque output over wide speed range, robustness, less maintenance and little manufacture costs are main advantages of Switched Reluctance Machines (SRM). On the other hand, high torque ripple, acoustic noise and rotor sensor requirements are the mainly cited drawbacks. There are two reasons of torque ripple. The first is saturation of the iron and the second is phase commutation. Saturation reduces the torque since torque will not be a function of square of phase current. Concerning phase commutation, improper transfer of torque production duty between phases causes torque ripple. Given the sources of torque ripple, two different groups of methods can be applied to reduce, either separately or together. These are the methods applied during the SRM magnetic design stage and methods applied during the SRM control technique. This paper proposes both methods combined. In the first section the rotor pole geometry of an existing 6/4 SRM will be modified to reduce torque ripple and increase average torque by means of an associated finite element model in complementation with self-prepared analytical design and calculation software (6). The second part of this paper investigates by means of a new SIMPLORER simulation model of the SRM how the modified rotor construction affects the operational behaviour with a usual angle control strategy, regarding average torque and torque ripple. The results show that an increased average torque and reduced torque ripple can be obtained by a favourable shift in the torque vs. angle characteristic due to relatively simple changes in rotor pole profile.
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