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Sensorless Vector Controlled Multi-Induction Motor Drive Using Stator-Current Based Phase-Locked Loop for Pump Application
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DOI：10.1109/TEC.2025.3630758.png)
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Abstract
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Multi-induction motor drive system wherein several induction motors are coupled together mechanically to drive a common load is becoming popular for high-power application. However, speed sensorless operation of such a drive is challenging specially at low operating frequency $(f_{s})$ primarily due to the issues related to flux estimation. This paper proposes a simple technique to improve the sensorless operation of an IM based multi-motor drive system (MMDS) at lower $f_{s}$, specifically for applications such as industrial pumps and fans, where the torque demand from the drive, is low at lower speed. For such loads, atleast one machine in the MMDS may not be required to produce any torque at low $f_{s}$. Since the accuracy of the speed ($\tilde{\omega }_{m}$) estimated using the voltage model of induction machine is poor at low $f_{s}$, the technique proposed here uses the stator current vector $(\overrightarrow{i}_{s})$ of zero torque producing machine to implement a phase-locked loop (PLL) in order to improve its accuracy. As $f_{s}$ increases, accuracy of $\tilde{\omega }_{m}$ improves and beyond a certain value of $f_{s}$, the PLL is no longer required. When that happens, all the motors in the MMDS may contribute to meet the load demand. The proposed technique is computationally less intensive and works satisfactorily upto very low speed of operation. The same is validated through experiments on an MMDS consisting of two 3.7-kW induction motors coupled together to a common shaft.
Keywords:
Induction motor drives
Phase locked loops
Sensorless control
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