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Keywords
(8)
Acoustic Noise
Control Strategy
Finite Element Model
Iron
Simulation Model
Switched Reluctance Motor
Torque Control
Switched Reluctance Machine
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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
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Influence of modified rotor geometry on torque ripple and average torque of a 6/4 Switched Reluctance Motor
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Torsten WICHERT
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 selfprepared 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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References
(1)
Effect of rotor profiles on the torque of a switchedreluctance motor
(
Citations: 20
)
Mehdi Moallem
,
CheeMun Ong
,
Lewis E. Unnewehr
Journal:
IEEE Transactions on Industry Applications  IEEE TRANS IND APPL
, vol. 28, no. 2, pp. 364369, 1992