Fast Torque Optimization Technology of Brushless Motor Using ANSYS Finite Element Software and Maxwell2D

In recent years, due to the large-scale research and development of brushless DC motor and the gradually mature technology, the distribution range of its drive system in industrial production has also expanded, and has gradually become the development mainstream [1] in the field of industrial automation. With the continuous development of industry, the motor control has also emerged more and more ways [2]. The operation principle of external rotor brushless motor is studied, a typical 12-slot 14 extremely concentrated winding UAV motor is described, and the optimization design of tooth groove torque and torque pulse is analyzed. Using ANSYS finite element software and Maxwell2D magnetic field, Optislang compares the sensitivity of different pole arc coefficients, negative length, and the simulation results show the effectiveness of the optimization method to provide effective basis for motor optimization design.

Design of External Rotor Ferrite-Assisted Synchronous Reluctance Motor for High Power Density

The rare-earth (RE) permanent magnets (PM) have been increasingly adopted in traction motor application. However, the RE PM is expensive, less abundant, and has cost uncertainties due to limited market suppliers. This paper presents a new design of a RE-free five-phase ferrite permanent magnet-assisted synchronous reluctance motor (Fe-PMaSynRM) with the external rotor architecture with a high saliency ratio. In such architecture, the low magnetic coercivity and demagnetization risk of the ferrite PM is the challenge. This limits the number of flux barriers, saliency ratio, and reluctance torque. A precise analytical design procedure of rotor and stator configuration is presented with differential evolution numerical optimizations by utilizing a lumped parameter model. A 3.7 kW prototype is fabricated to validate the proposed idea.