Performance and Harmonic Analysis of a Three-Phase Induction Motor with Various Coil Pitch Configurations
Öz
In this work, analyses of the effect of full-, under-, and over-pitched stator winding configurations on the efficiency, output power, torque characteristics, and current and voltage harmonic components are carried out on a three-phase, squirrel cage induction motor. Performance analyses have been performed both via Ansys/RMxprt and Maxwell/2D software by modelling the stator winding with coil pitches of 100°, 120°, 140°, 160°, 180°, 200°, 220°, 240°, and 260°. Current and voltage harmonics analyses have been performed in Matlab using the data obtained from Maxwell/2D simulations. Maxwell/2D results showed that the maximum efficiency is attained at 200° over-pitched configuration, which is 0.73% higher than the efficiency when the motor is full-pitched. The maximum output power and torque are attained at 240° over-pitched configuration, which is 7.96% and 7.45% more than the power and torque obtained when the motor is full-pitched, respectively. Harmonic analysis results showed that both under-pitched and over-pitched coils can be used to eliminate harmonics in the current and voltage waveforms. However, over-pitched coils performed better in eliminating the phase current harmonics. The minimum total harmonic distortion (THD) of the phase current and induced voltage are reached at 260° over-pitched and 120° under-pitched configurations, which is 52.39% and 74.36% lower than the THD when the motor is full-pitched, respectively. Over-pitched coils provide slightly higher efficiency, output power, and torque than the under-pitched coils. There is no unique coil pitch configuration to eliminate all harmonic components. Therefore, in order to eliminate a specific harmonic component, a specific coil-pitch must be applied.
Anahtar Kelimeler
Coil pitch, Finite element analysis, Harmonics, Induction motor, Stator winding
Kaynakça
- Arish, N., & Yaghobi, H. (2021). Effect of winding arrangement on the electromagnetic performance of HTS squirrel cage induction motor. 2021 29th Iranian Conference on Electrical Engineering (ICEE), Theran, Iran. doi:10.1109/ICEE52715.2021.9544360
- Birbir, Y., & Nogay, H. S. (2007). Voltage and current harmonic variations in three-phase induction motors with different stator coil pitches. International Journal of Energy, 1(4).
- Chapman, S. J. (2012). Electric machinery fundamentals (5th Ed.). New York, USA: Mcgraw-Hill.
- Deshmukh, R., Moses, A. J., & Anayi, F. (2006a). Behavior of three-phase induction motors with variable stator coil winding pitch. Journal of Applied Physics, 99(8), 08R310. doi:10.1063/1.2170062
- Deshmukh, R., Moses, A. J., & Anayi, F. (2006b). Voltage harmonic variation in three-phase induction motors with different coil pitches. Journal of Magnetism and Magnetic Materials, 304(2), e810–e812. doi:10.1016/j.jmmm.2006.03.005
- Deshmukh, R. R. R. (2006). Voltage Harmonics Analysis and Efficiency of Three-phase Induction Motor with Change in Coil Pitch of the Stator Winding. UK: Cardiff University.
- Deshmukh, R., Kumar, K. S., Joshi, P., & Subrahmanyam, K. (2020). Effect of chording on the efficiency of induction motor supplied by PWM inverter. IOP Conference Series: Materials Science and Engineering, 981(4), 42058. doi:10.1088/1757-899X/981/4/042058
- Di, C., Petrov, I., & Pyrhönen, J. J. (2019). Design of a high-speed solid-rotor induction machine with an asymmetric winding and suppression of the current unbalance by special coil arrangements. IEEE Access, 7, 83175-83186. doi:10.1109/ACCESS.2019.2925131
- Fitzgerald, A. E., Kingsley, C., & Umans, S. D. (2013). Electric machinery (6th Ed.). New York, USA: Mcgraw-Hill.
- Gundogdu, T., Zhu, Z., & Mipo, J. (2020). Analysis of coil pitch in induction machines for electric vehicle applications. IET Electric Power Applications, 14(12), 2525–2536. doi:10.1049/iet-epa.2019.0980