Design an‎d Optimization of a Self-Starting Disc-Type Permanent Magnet Synchronous Motor

10/20/2026 12:00:00 AM

In this thesis, a novel configuration of an axial-flux permanent magnet hysteresis motor is introduced, aiming to combine the advantages of both hysteresis an‎d permanent magnet motors together with the positive features of an axial flux structure. The proposed design delivers satisfactory torque under both starting an‎d steady state operation. To develop this structure, several topologies were proposed to improve existing axial flux hysteresis motors. These designs were analyzed using finite element simulation based on the elliptical model for hysteresis loop representation. After selec‎ting the topology providing the highest torque within comparable dimensions an‎d a simpler structure, the design equations an‎d algorithm for the proposed motor were derived, considering the torque contribution of both magnet an‎d hysteresis materials. Finite element analyses were then carried out for the starting an‎d steady state conditions using a more precise Preisach model. A sensitivity analysis method was employed to optimize the radial thickness of the magnet an‎d hysteresis materials. Subsequently, the motor performance was eva‎luated at various speeds, an‎d the influence of induced torque during startup was examined. Finally, a prototype of the proposed motor was built an‎d torque tests were conducted. The measured results were compared an‎d validated against the finite element simulations an‎d analytical method. The findings indicate a significant 35% increase in steady state torque compared to the original hysteresis motor. Although the starting torque decreased by about 12% due to magnet usage, the recorded starting torque was approximately three times higher than that of the initial hysteresis motor, attributed to the induced torque of the hysteresis material an‎d the use of an aluminum retainer. This research, by proposing a new an‎d simple topology, successfully integrates the benefits of permanent magnet an‎d hysteresis motors within an axial flux configuration, achieving desirable torque performance in both operating modes.

موتور هيسترزيس آهنرباي دائم , شار محوري , گشتاور , المان محدود , پريساج

Permanent magnet-hysteresis motor , Axial flux , Torque , Finite element , Preisach

Hashem Yousefi Javid

Dr. Abolfazl Vahedi