Design of Hollow-Rotor Brushless DC Motor

Abstract

This paper discusses about design of hollow-rotor Brushless DC (BLDC) motor. A conventional BLDC motor has more leakage flux circling at the end of the permanent magnet that will limit torque. To overcome this problem, a new BLDC model known as hollow-rotor is proposed. The objective of this research is to design a hollow-rotor motor that will have higher torque density compared to conventional BLDC motor using Finite Element Method (FEM). In addition, performance analysis of the proposed hollow-rotor has also been carried out. For validation, the result of FEM is compared with the measurement result. It shows that, the simulation result has good agreement with the measurement result. For comparison, hollow-rotor shows higher torque density compared to conventional BLDC motor. As a conclusion, this paper provides guidelines and analysis in designing high torque hollow-rotor motor.

Reduction in Cogging Torque and Flux per Pole in BLDC Motor by Adapting U-Clamped Magnetic Poles

“…Further stator slots skewing [7]- [8], adapting to different combination of slot numbers and pole numbers [9] and adapting to Isodiametric and Semi-circled magnet [1], [10] are some of the other methods used. A FEA method based on a combination of electromagnetic field and circuit equation for magnetic field modelling and torque prediction is presented for decreasing the level of cogging torque for sufficient condition without skewing [11]. In their paper, some core shapes that reduce cogging torque are designed by using genetic algorithm [12].…”

A Review: Design Variables Optimization and Control Strategies of a Linear Switched Reluctance Actuator for High Precision Applications

“…Even though theoretically has proves that larger wire diameter will has lower resistance and hence larger thrust force but studied shows that further increased in the wire diameter may not satisfy the condition of thrust force [48]. R. Othman et al found that the increase in the coil size will cause the flux density of actuator to be reduced [62]. As a conclusion, optimization of the coil diameter is an important parameter in designing the electromagnetic actuator.…”