Lin Mingyao

Effect of rotor position error on commutation in sensorless BLDC motor drives

In this paper, two kinds of commutation modes of the brushless DC(BLDC) motor drives, the delaying commutation and the leading commutation, are discussed in detail. The current of the unexcited phase is calculated under an ideal operation condition, and the condition of circulating current occurring is analyzed. The result with the compensated commutation is provided. The theoretical analysis is confirmed by the experiment results.

Design and analysis of linear rotary permanent magnet generator for wind-wave combined power generation system

A Linear Rotary Permanent Magnet Generator(LRPMG) is proposed for wind-wave combined power generation system(WWCPGS). The rotary unit and linear unit of the LRPMG can be used to generate electricity by wind energy and wave energy, respectively. Compared with rotary generator by single wind power and linear generator by single wave power, the LRPMG can improve the utilization rate of the material and improve the power density of the motor. The characteristics, including three-phase back electromotive force (EMF), terminal voltage, air-gap flux density and external characteristic of the LRPMG are analyzed by the finite-element method (FEM).