Unbalanced force calculation in switched-reluctance machines

This paper presents a detailed analytical model for computing the radial ma gnetic forces that arise in switched reluctance machines (SRM's). The model is general and includes iron saturation, displacements of the rotor from i ts center location, and arbitrary angular rotor positions. The force betwee n an individual stator pole and its corresponding rotor pole is calculated. The model is used to calculate the unbalanced magnetic forces on the SRM r otor, due to the rotor being displaced from its center location, by calcula ting the difference in the radial magnetic forces on opposite stator poles. The calculation of the unbalanced magnetic rotor forces requires an especi ally accurate model for the radial magnetic forces since the unbalanced for ces are the difference between the two large radial forces on opposite side s of the rotor. The side pull created by the unbalanced forces will stress the bearings of the motor. The detailed analytical model presented here wil l simplify the bearing system design and will be especially useful if less stiff magnetic bearings are being employed. Finite-element analysis is used to validate the detailed analytical model. This same model for calculating the radial magnetic forces can be used as the input to a calculation of st ator yoke ovulation due to radial magnetic forces and of the resulting acou stical noise production.