A controller of PMSM for elctrical bicycle with hall effect sensors
In this paper, rotor position and speed estimation method using hall-effect sensors for low-cost vector controller design is presented for Permanent Magnet Synchronous Motor (PMSM). Sensorless control and self-learning implementation was also realized based on theoretical analysis. Experimental results verified the feasibility of the proposed control strategies.
Development of in-wheel motor system using blushless DC motor of hall sensor type
In-wheel motor system using Hall sensor type BLDC motor, which is used to drive the electric vehicle, is developed. By directly attaching the electric motor in the wheel of tier, this system can eliminate the power train elements, so has a high efficiency and high performance. In this work, in-wheel motor is designed using the electromagnetic analysis with finite element method, and BLDC motor driver is designed using the digital signal processor (DSP), and driving program is designed. From the performance test, the developed in-wheel motor system has the performances such as rated output of 5700 W, rated torque of 15.0 Nm, rated velocity of 4000 rpm. Also, developed in-wheel motor system can be applicable in the electric vehicle.
Fault analysis on driving motors of lunar rover wheels
An electromagnetic simulation model of REPMM under normal state was built and the model was modified to accommodate diversified faults including converter switch fault, winding fault and hall effect position sensor fault. The faults were simulated and the performance waveforms relevant to different faults were obtained. Characteristics of faults were recognized by comparing performance waveforms under faulty states to those under normal state. Results of simulation were analyzed and the references to REPMM fault diagnosis and strategies of coordinate control for lunar rover's wheels were provided.