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Maximum torque-per-Amp control for traction IM drives: theory and experimental results

Bozhko, Serhiy; Dymko, Serhii; Kovbasa, Serhii; Peresada, Sergei


Professor of Aircraft Electric Power Systems

Serhii Dymko

Serhii Kovbasa

Sergei Peresada


A novel maximum torque per Ampere (MTPA) controller for induction motor (IM) drives is presented. It is shown to be highly suited to applications that do not demand an extremely fast dynamic response, for example electric vehicle drives. The proposed MTPA field oriented controller guarantees asymptotic torque (speed) tracking of smooth reference trajectories and maximises the torque per Ampere ratio when the developed torque is constant or slow varying. An output-feedback linearizing concept is employed for the design of torque and flux subsystems to compensate for the torque-dependent flux variations required to satisfy the MTPA condition. As a first step, a linear approximation of the IM magnetic system is considered. Then, based on a standard saturated IM model, the nonlinear static MTPA relationships for the rotor flux are derived as a function of the desired torque, and a modified torque-flux controller for the saturated machine is developed. The flux reference calculation method to achieve simultaneously an asymptotic field orientation, torque-flux decoupling and MTPA optimization in steady state is proposed. The method guarantees singularity-free operation and can be used as means to improve stator current transients. Experimental tests prove the accuracy of the control over a full torque range and show successful compensation of the magnetizing inductance variations caused by saturation. The proposed MTPA control algorithm also demonstrates a decoupling of the torque (speed) and flux dynamics to ensure asymptotic torque tracking. In addition, a higher torque per Ampere ratio is achieved together with an improved efficiency of electromechanical energy conversion.


Bozhko, S., Dymko, S., Kovbasa, S., & Peresada, S. (2017). Maximum torque-per-Amp control for traction IM drives: theory and experimental results. IEEE Transactions on Industry Applications, 53(1), 181-193.

Journal Article Type Article
Acceptance Date Aug 26, 2016
Online Publication Date Sep 13, 2016
Publication Date Feb 1, 2017
Deposit Date Jun 28, 2017
Publicly Available Date Jun 28, 2017
Journal IEEE Transactions on Industry Applications
Print ISSN 0093-9994
Electronic ISSN 0093-9994
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 53
Issue 1
Pages 181-193
Keywords induction motor, torque, control, tracking, saturation
Public URL
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Additional Information 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.


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