Electric motors and drives consume approximately 40% of the electrical energy generated worldwide. In industrial applications, electric motors account for about 70% of energy consumption. Thus, it can be said that one way to save electrical energy is to increase the efficiency of electric motors.
SynRMs have been preferred in industry for their low cost, simple structure, field weakening capability, small loss, and high torque-to-volume ratio. High efficiency, power factor and torque-to-volume ratio depend on the saliency. It is determined by the synchronization and steady state performance according to starting winding parameters and barrier dimension.
An Se Gwang, a researcher at the Faculty of Electrical Engineering, designed a line-start synchronous reluctance motor (LS-SynRM) with reference to a 1kW induction motor, and determined the optimum rotor structure parameters.
The comparison of the rotor structure of these two motors with the same stator showed that the LS-SynRM has lighter rotor structure by 27.1%.
He determined the optimum dimensions for good synchronization performance and high power factor to be as follows: the diameter of starting winding ds2=4mm, the bridge thickness H=5.5mm, the yoke thickness Y0=5mm, and the barrier thickness B0=3mm.
You can find details in his paper “Determination of Reasonable Rotor Structure Parameters of Line Start Synchronous Reluctance Motor with Round Bar” in “Proceedings of KUTIC-2025”.