Single Current Sensor-Based Speed Sensorless Vector Controlled PMSM Drive

Abstract

Single current sensor-based speed sensorless vector controlled PMSM ("Permanent Magnet Synchronous Motor") drive is presented in this paper. Speed, position, and currents are estimated using single current sensor information of 3-Ф PMSM drive. 2-Ф currents in the 𝑑𝑞 − 𝑎𝑥𝑒𝑠 are calculated and closed in the loop using 𝑖 * and a phase current information obtained from the single current sensor. The proposed method applies to all types of 3-Ф PMSM; current estimation is independent of machine parameters and inverter switching states. Drive is made speed and position sensorless by estimating using Y-MRAS (Model Reference Adaptive System). Y-MRAS is developed using reference voltages and estimated currents. The speed estimator depends on stator resistance; any variation in it will affect the drive performance. So, stator resistance needs to be estimated online and compensated in the speed estimation technique. Modified P-MRAS technique is used for stator resistance estimation. Here, the drive performance is also validated under stator resistance variation and its compensation. The proposed drive is independent of switching states, integrator terms, and differentiator terms. The single sensor drive reduces the overall cost of the drive and can be implemented into the existing system for sensor condition monitoring and to make the drive fault tolerant against the sensor failure without any extra hardware. The proposed single sensor-based drive is theoretically-modeled and simulated in the MATLAB/SIMULINK platform. The stability of the proposed drive is verified through a stability analysis. It is experimentally validated using a laboratory-developed PMSM drive prototype with a dSPACE-1104 controller board.

Analysis and Compensation of Phase Current Measuring Error Caused by Sensing Resistor in PMSM Application

“…The current sensor plays a crucial role in the PMSM drive control system; it feeds the sampled phase current information back to the current loop, and the accuracy of phase current sampling directly affects the stability of the PMSM drive control system [ 31 , 32 ]. During long term operation, the performance of PMSM can be affected by various environmental factors such as vibration impact, high and low temperature, humidity, and dust.…”