Aspects of design optimisation for switched reluctance motors

Existing papers about suitable switched reluctance motor (SRM) airgap dimensions, which give optimum performance for doubly-salient structure motors, are reviewed and their deficiencies are mentioned. The recommendations of these papers cover a wide range of t/λ (tooth width/tooth pitch), which can optimise the performance of the SRM. Although some parts of these results are supported by the present work, some other parts may not be correct. A developed software package has been applied to the design of a single-tooth peg stator pole SRM. It is concluded that the optimum ratio of t/λ is between 0.33 and 0.40. Using the design constraints considered, the optimum split ratios (defined as the ratio of rotor diameter to stator outer core diameter) are estimated at between 0.57 and 0.63. The ratio between the back of core width and half of tooth width in the motor is estimated and it is found that the best range of this ratio is from 1.1 to 1.3