The Study On Test Platform And Rotor Position Identification Of Permanent Magnet DC Motor

Because of the advantages of high power density, high efficiency, stable performance, high torque output, and so on, the application of permanent magnet DC motor has been widely used. The performance test of the motor, the detection of the fault parameters and the rotor position detection method have important value for the improvement of the motor control method, the verification of the control performance, and the research of the fault tolerant control method.In this paper, the LabVIEW and USB data acquisition card and a variety of sensors are used to design a permanent magnet DC motor test platform. The acquisition and spectrum analysis of the signal of motor speed, torque, current, noise, vibration and voltage are realized. At the same time, the rotor position signal is identified by the method of zero-crossing of line back EMF. The main research work of this paper is as follows:A novel scheme of zero-crossing of line back EMF sensing rotor position is presented. The new algorithm is simulated by Matlab. The simulation result proves than the method is correct.The current signal control circuit is designed. The hardware of the test platform is constructed by USB5935 data acquisition card, the acceleration vibration sensor, sound sensor, torque sensor, the current signal control circuit and a computer. The software is based on the function of LabVIEW. The function of the signal acquisition system is written to realize the collection, filtering, analysis, curve fitting and rotor position identification of the signal acquisition system.Finally, the armature current, vibration, noise, torque, rotating speed of the permanent magnet DC motor, and back EMF signal are collected. The correlation signal is analyzed in time domain and frequency domain. The rotor position signal is estimated by using back EMF. The feasibility of the platform and the algorithm is verified.Simulation analysis and experiments show that the acquisition system can be used to detect the on-line performance of permanent magnet DC motor. The test platform of permanent magnet DC motor provides services for the control and fault diagnosis of permanent magnet DC motor.