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This paper is aimed at enhancing PMSM performance characteristics using the combination of vector control and model predictive control. The methods involves simulation of PMSM system in a SimulinkMatlab environment, using the system to analyze the effect of vector controller on PMSM performance characteristics based on the equivalent circuit, using the system to analyze the effect of model predictive controller on PMSM performance characteristics, using the system to analyze the effect of the combination of vector controller and MPC on PMSM performance characteristic and validation of the enhanced PMSM performance characteristics with other conventional control method. The analysis involves verifying torque production, response to speed tracking, transient current control capabilities at time intervals of 0.5s at reference speed of 1000RPM and 1500RPM. The analysis when vector controller was implemented, at reference speed of 1000 RPM, shows that vector controller has fast dynamic response as it tracks the targeted velocity but has an overshoot from 1000RPM to 1,180RPM, 18% of the reference speed. With the load disturbance of 1N to the torque at 0.5s, the velocity went down to 510 RPM which is 49% of the reference speed, the transient current amplitude control capability was 10A, and there was torque production but with ripples. When the reference speed was adjusted to 1500RPM, it tracked the targeted velocity but has an overshoot from 1500RPM to 1700RPM, 13. 3% of the reference speed, the transient current control capability was 10A, and there was torque production but with ripples. In the analysis with Model Predictive Controller using a reference speed of 1000RPM, the system tracks the reference speed faster but has an overshoot from 1000 RPM to 1020 RPM, 2% of the reference speed, there was torque production with less ripple. With the load disturbance of 1N to the torque at 0.5s, the velocity went down to 602RPM, 3.9.8% of the reference speed. The transient current amplitude control capability was 10A. When the reference speed was adjusted to 1500RPM, it did not track the targeted velocity but went down from 1500RPM to 1480RPM 1.33% less the reference speed. With the load disturbance of 1N the velocity went down to 300RPM, 80% less the reference speed. There was torque production, and the transient current control capability was 10A.The analysis when a combined vector control and MPC method were implemented, with the reference speed set at 1000 RPM shows that the PMSM has been enhanced; there was fast tracking of reference speed, and torque producing current i_q was achieved. i_q is the quadrature axis current responsible for torque production and adjustment of motor torque which directly affect the motor speed and acceleration. When i_d current (direct axis) is set to zero, maximum efficiency and torque production is achieved, hence the main source of torque production will be by the interaction between the i_q and the rotors magnetic field created by permanent magnets. The actual speed does not have overshoot, and it tracks closely to the reference speed. With a disturbance of 1N load torque at t0.5s, the speed remains constant. When the speed was adjusted to 1500RPM the information remains the same as it was when the speed was 1000RPM, hence the combination of vector control and MPC have being used to enhance PMSM performance characteristics. The comparison shows that when reference speed was 1000 RPM; vector controller has an overshoot of 180 RPM (18% of referenced speed), MPC has an overshoot of 20 RPM (2% of referenced speed), and the enhanced PMSM maintained the reference speed (1000 RPM). When the reference speed was adjusted to 1500 RPM: vector controller has an overshoot of 200 RPM which is 13.3% of referenced speed, MPC has an overshoot of 20 RPM (1.33% of the reference speed), while the enhanced method maintained 1500 RPM.. Also, the transient behavior of current control capability showed that at 0.05_s and 0.06_s, the current amplitude for vector control and MPC each was 10A, while the enhanced scheme has 8A.The research contributed in finding a faster dynamic velocity response of PMSM that solves the problem of ripple torque and helps the motor to run very close to its reference speed not minding load disturbance. Hence the enhanced PMSM is more suitable for industrial automations and robotics.

Copyright © 2024 Otor, Emmanuel. This is an open access article distributed under the Creative Commons Attribution License.