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http://dx.doi.org/10.5762/KAIS.2018.19.3.584

Performance of Adaptive Maximum Torque Per Amp Control at Multiple Operating Points for Induction Motor Drives  

Kwon, Chun-Ki (Department of Medical IT Engineering, Soonchunhyang University)
Kong, Yong-Hae (Department of Medical IT Engineering, Soonchunhyang University)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.19, no.3, 2018 , pp. 584-593 More about this Journal
Abstract
The highly efficient operation of induction motors has been studied in the past years. Among the many attempts made to obtain highly efficient operation, Maximum Torque Per Amp (MTPA) controls in induction motor drives were proposed. This method enables induction motor drives to operate very efficiently since it achieves the desired torque with the minimal stator current. This is because the alternate qd induction motor model (AQDM) is a highly accurate mathematical model to represent the dynamic characteristics of induction motors. However, it has been shown that the variation of the rotor resistance degrades the performance of the MTPA control significantly, thus leading to its failure to satisfy the maximum torque per amp condition. To take into consideration the mismatch between the actual value of the rotor resistance and its parameter value in the design of the control strategy, an adaptive MTPA control was proposed. In this work, this adaptive MTPA control is investigated in order to achieve the desired torque with the minimum stator current at multiple operating points. The experimental study showed that (i) the desired torque was accurately achieved even though there was a deviation of the order of 5% from the commanded torque value at a torque reference of 25 Nm (tracking performance), and (ii) the minimum stator current for the desired torque (maximum torque per amp condition) was consistently satisfied at multiple operating points, as the rotor temperature increased.
Keywords
Induction motor model; maximum torque per amp (MTPA) control; maximum torque per amp condition; multiple operating points; rotor resistance variation; thermal effects;
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