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PI and Sliding Mode Speed Control of Permanent Magnet Synchronous Motor Fed from Three Phase Four Switch VSI

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Author(s): Ashok Kumar R, Dr. Balaji K
Affiliation(s): 
Department of Electrical and Electronics Engineering, St.Peter’s University, Chennai, Tamilnadu, India.
 
Cite this paper
Ashok Kumar R,  Dr. Balaji K, "PI and Sliding Mode Speed Control of Permanent Magnet Synchronous Motor Fed from Three Phase Four Switch VSI", Journal of Mechanical Engineering Research and Developments, vol. 40, no. 4, pp.716-725, 2017. DOI: 10.7508/jmerd.2017.04.019
 
Document Type: Research Article
 
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Abstract
Variable speed permanent magnet synchronous motor drives require a high performance dynamic speed controller capable of tracking reference speed even under varying load conditions. Vector control of permanent magnet synchronous motor fed from three phase four switch inverter with sliding mode controller as speed regulator is proposed. An observer is used to estimate load torque of PMSM motor which improves the performance of sliding mode controller during load variations. In the proposed PMSM drive system only four power electronic switches are used in the voltage source inverter. The use of reduced number of power switches decreases switching losses and overall cost of the drive. An appropriate vector control technique is employed in the drive which uses two PI controllers to regulate stator current and a single band hysteresis comparator to generate PWM pulse for three phase four switch inverter fed PMSM drive. The proposed vector control technique improves the overall performance of the PMSM drive and a detailed analysis is made between PI and sliding mode controller as speed regulator for the proposed system. Sliding mode controller shows excellent speed regulation performance during starting and varying load conditions in comparison with PI controller. The merits of the proposed PMSM drive system using TPFSI is verified by simulations in Simulink/MATLAB environment. 
 
Keywords
Permanent Magnet Synchronous Motor (PMSM), Proportional Integral Controller (PI), Sliding Mode Controller (SMC), Three Phase Four Switch Inverter (TPFSI), Load Torque Observer.
 
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