Rotor position estimation over entire speed range of interior permanent magnet synchronous motors

Abstract

This paper presents a method for transitioning between sensorless rotor position estimation methods for an interior permanent magnet synchronous motor (IPMSM). Through the proposed method, rotor position estimation over the entire speed range of the IPMSM is possible. Considering that each sensorless method governs a different speed range for estimating rotor position and speed with good accuracy, a strategy for transitioning between two methods is indispensable. In this study, a sensorless method based on extended back electromotive force (EMF) is used for high-speed operation. In addition, during low-speed operation, rotor position is estimated using the slope of measured current through the application of a zero-voltage vector. A weight function is applied to the position and speed information obtained from the two sensorless methods. The combined information is then used throughout the speed range of the IPMSM. To achieve smooth transitions, the weight function is altered based on the rotor speed in the transition region. The effectiveness of the proposed transition method was demonstrated via simulations and experiments.

Experimental Evaluation of Predictive Torque Control of IPMSM under Speed Sensor and Sensorless Extended EMF Method

“…A sensorless extended EMF is normally applied for the medium-and high-speed operation of IPMSMs owing to its simple calculation and can be easily applied with less complexity, considering the direct proportionality between the EMF and the rotor speed [37][38][39].…”

A Comparison Research on Sliding Mode Observation Methods for SPMSM in Sensorless Environment of Medium-to-High Speed

“…Compared with mechanical rotor position sensor system, the sensorless control technology is a breakthrough. To obtain the rotor position and speed information, it processes and calculates the sampled current, voltage and other physical quantities through software programming [3][4], which not only effectively reduces the system cost, volume and complexity of hardware design, but also improves the reliability of the control strategy of the full set of drive systems. Therefore, the sensorless control technology has attracted much attention in the industry, and the algorithm driven by sensorless has also become a research hotspot of PMSM control strategy at present.…”

Adaptive-wavelet-filtering-based Stator Current Zero-crossing Detection Method for High-Speed Micromotor

“…The motor stator current method is also a non-contact measurement method, in which the winding signal of the motor stator is collected by a current probe, and the collected current signal is analyzed spectrally to determine the motor speed. (14,15) This method can make up for the shortcomings of the traditional vibration and acoustic signal detection methods and can markedly reduce monitoring and detection costs. (16) In analog measurement, the intermediate-frequency component of the collected signal is generally obtained to calculate the motor speed.…”