Hybrid sensorless control of IPMSM Combining high frequency injection method and back EMF method

Abstract

This paper introduces a new hybrid sensorless control of interior permanent magnet synchronous machines (IPMSM) combining high frequency injection and back EMF based method. The proposed control system realizes position, speed, and torque control in the entire speed range. Owing to the reliability and the space-saving feature, the sensorless control is applied to direct drive applications with great expectations. As successful applications, an injection molding machine and a compressor are introduced in this paper. Experimental results show the effectiveness to the required specification of the control modes.

Position Sensorless Control for IPMSM Based on Extended EMF and Voltage Injection Synchronized with Pulse‐Width Modulation Carrier

“…In order to implement sensorless control in entire speed range from zero speed through the rated speed, estimation methods are switched between estimation based on induced voltage in high speed range, and estimation using HF signal injection in low speed range [9]. However, this poses some problems, such as complication of estimation algorithms.…”

Sensorless Control of IPMSM: Past, Present, and Future

“…As mentioned in chapter 2 of this paper, because the back EMF based technique is able to estimate position and speed without acoustic and additional torque ripple above 10% of the rated speed, a hybrid method can be employed as shown in Fig. 14, where the high frequency signal injection (HFSI) technique is used at lower speed and back EMF technique at higher speed (35) . The key idea in here is the changeover which is done only based on the internal speedω cmb .…”