Authors : Manzar Hussain; Tian Bing; Bian Zeyu; Ali Abbas

Volume/Issue : Volume 11 - 2026, Issue 4 - April

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Google Scholar : https://tinyurl.com/2mx6psh6

Scribd : https://tinyurl.com/6s9hsn9c

DOI : https://doi.org/10.38124/ijisrt/26apr418

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Abstract : Traditional sensorless control systems of Permanent Magnet Synchronous Motors (PMSM) are based on PhaseLocked Loop (PLL) algorithms for speed and position estimation but possess the problem of the accuracy and stability under varying load conditions. The paper proposed a sensor less control system based on PLL⁺ algorithm when improved with a random frequency PWM approach to reduce noise and electromagnetic interference (EMI). The proposed system improves the accuracy of estimation and smoothness in torque operations without mechanical sensors. Simulation and FFT analysis have shown that the PLL⁺ based system has better performance and greater reliability than conventional PLL-based control systems, thus offering a cost effective and efficient solution for PMSM drives.

Keywords : Sensor less Control, PMSM, PLL+, Speed Estimation, Position Estimation.

References :

1. Kim, J., et al., "Sensor less Control of PMSM Using PLL," IEEE Transactions on Industrial Electronics, vol. 56, no. 8, pp. 2723–2732, 2009.
2. Zhang, H., et al., "Sensor less Motor Control Based on Extended Kalman Filter," IEEE Transactions on Power Electronics, vol. 35, no. 5, pp. 1234–1245, 2011.
3. Liu, Y., et al., "Phase-Locked Loop Techniques for Sensor less PMSM Drives," IEEE Transactions on Industrial Applications, vol. 52, no. 3, pp. 2267–2276, 2015.
4. Tanaka, T., et al., "Sensor less Control of PMSM Using PLL," IEEE Transactions on Industrial Electronics, vol. 45, no. 9, pp. 892–900, 2013.
5. Gupta, R., et al., "Challenges in Sensor less Control for PMSM," IEEE Transactions on Power Electronics, vol. 28, no. 6, pp. 2258–2269, 2017.
6. Huang, Z., et al., "PLL-Based Sensor less Control for PMSM with Load Torque Estimation," IEEE Transactions on Industrial Electronics, vol. 59, no. 10, pp. 4071–4080, 2018.
7. Hosseini, M., et al., "Phase-Locked Loop for Speed Estimation in PMSM Drives," IEEE Transactions on Power Electronics, vol. 63, no. 7, pp. 1474–1483, 2016.
8. Zhang, Q., et al., "Electromagnetic Interference Reduction in PMSM," IEEE Transactions on Industrial Electronics, vol. 64, no. 11, pp. 8881–8890, 2018.
9. Zhang, Y., et al., "Dynamic Response Improvement in PMSM Using PLL," IEEE Transactions on Industrial Applications, vol. 54, no. 12, pp. 4221–4230, 2019.
10. Zhao, P., et al., "Three-Level NPC Inverter and Its Applications," IEEE Transactions on Industrial Electronics, vol. 59, no. 4, pp. 2321–2332, 2020.
11. Li, Y., et al., "Sensor less Control and Inverter for PMSM," IEEE Transactions on Energy Conversion, vol. 37, no. 1, pp. 134–144, 2022.
12. Wang, H., et al., "Cost-Effective Sensor less Control System for PMSM," IEEE Transactions on Industrial Electronics, vol. 66, no. 5, pp. 1234–1246, 2021.
13. 13] ZHAO Wenxiang, LI Liang, JI Jinghua, et al. Sawtooth carrier double random SVPWM strategy for dual three-phase PMSM[J]. Proceedings of the CSEE，2022，42 (09)：3412-22.
14. MA Baohui, LI Ning, TIAN Bowen, et al. Three-level NPC converter ripple current and EMI optimized modulation strategy[J]. Journal of Power Supply，2022，1-12.
15. ZHAO Wenxiang, LI Liang, JI Jinghua, et al. Sawtooth carrier double random SVPWM strategy for dual three-phase PMSM [J]. Proceedings of the CSEE，2022，42 (09)：3412-22.