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Impact of speed ripple on the back-Emf waveform of permanent magnet synchronous machines

Jeroen De Kooning (UGent) , Jan Van de Vyver (UGent) , Tine Vandoorn (UGent) , Bart Meersman (UGent) and Lieven Vandevelde (UGent)
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Abstract
Permanent Magnet Synchronous Machines (PMSMs) are frequently used in industry due to their high efficiency and favorable dynamic properties. Mechanical limitations and design considerations cause several harmonics in the flux and back-emf of these machines. The back-emf harmonics can be measured on the machine terminals if no stator current is present and the neutral point is accessible. The measured harmonics can then be included in a mathematical model of the machine. This measurement is often done for a constant speed. However, when a speed ripple is present, several new harmonics are introduced in the flux and back-emf. Although the existence of this phenomenon is intuitively clear, it has not yet been investigated in detail and no method exists to calculate these additional harmonics. Nevertheless, the impact of a speed ripple on the back-emf can become significant in some applications. Therefore, in this paper, a mathematical model is presented which allows to accurately calculate the additional back-emf harmonics in the presence of speed ripples. Also, it provides more insight in the interaction between speed ripples and harmonics. The mathematical model is extensively validated by means of simulations and experiments.
Keywords
BRUSHLESS DC MOTOR, TORQUE RIPPLE, DRIVE, DESIGN, GENERATOR, WIND TURBINE, REDUCTION

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MLA
De Kooning, Jeroen et al. “Impact of Speed Ripple on the back-Emf Waveform of Permanent Magnet Synchronous Machines.” IET ELECTRIC POWER APPLICATIONS 7.5 (2013): 400–407. Print.
APA
De Kooning, Jeroen, Van de Vyver, J., Vandoorn, T., Meersman, B., & Vandevelde, L. (2013). Impact of speed ripple on the back-Emf waveform of permanent magnet synchronous machines. IET ELECTRIC POWER APPLICATIONS, 7(5), 400–407.
Chicago author-date
De Kooning, Jeroen, Jan Van de Vyver, Tine Vandoorn, Bart Meersman, and Lieven Vandevelde. 2013. “Impact of Speed Ripple on the back-Emf Waveform of Permanent Magnet Synchronous Machines.” Iet Electric Power Applications 7 (5): 400–407.
Chicago author-date (all authors)
De Kooning, Jeroen, Jan Van de Vyver, Tine Vandoorn, Bart Meersman, and Lieven Vandevelde. 2013. “Impact of Speed Ripple on the back-Emf Waveform of Permanent Magnet Synchronous Machines.” Iet Electric Power Applications 7 (5): 400–407.
Vancouver
1.
De Kooning J, Van de Vyver J, Vandoorn T, Meersman B, Vandevelde L. Impact of speed ripple on the back-Emf waveform of permanent magnet synchronous machines. IET ELECTRIC POWER APPLICATIONS. 2013;7(5):400–7.
IEEE
[1]
J. De Kooning, J. Van de Vyver, T. Vandoorn, B. Meersman, and L. Vandevelde, “Impact of speed ripple on the back-Emf waveform of permanent magnet synchronous machines,” IET ELECTRIC POWER APPLICATIONS, vol. 7, no. 5, pp. 400–407, 2013.
@article{3119287,
  abstract     = {Permanent Magnet Synchronous Machines (PMSMs) are frequently used in industry due to their high efficiency and favorable dynamic properties. Mechanical limitations and design considerations cause several harmonics in the flux and back-emf of these machines. The back-emf harmonics can be measured on the machine terminals if no stator current is present and the neutral point is accessible. The measured harmonics can then be included in a mathematical model of the machine. This measurement is often done for a constant speed. However, when a speed ripple is present, several new harmonics are introduced in the flux and back-emf. Although the existence of this phenomenon is intuitively clear, it has not yet been investigated in detail and no method exists to calculate these additional harmonics. Nevertheless, the impact of a speed ripple on the back-emf can become significant in some applications. Therefore, in this paper, a mathematical model is presented which allows to accurately calculate the additional back-emf harmonics in the presence of speed ripples. Also, it provides more insight in the interaction between speed ripples and harmonics. The mathematical model is extensively validated by means of simulations and experiments.},
  author       = {De Kooning, Jeroen and Van de Vyver, Jan and Vandoorn, Tine and Meersman, Bart and Vandevelde, Lieven},
  issn         = {1751-8660},
  journal      = {IET ELECTRIC POWER APPLICATIONS},
  keywords     = {BRUSHLESS DC MOTOR,TORQUE RIPPLE,DRIVE,DESIGN,GENERATOR,WIND TURBINE,REDUCTION},
  language     = {eng},
  number       = {5},
  pages        = {400--407},
  title        = {Impact of speed ripple on the back-Emf waveform of permanent magnet synchronous machines},
  url          = {http://dx.doi.org/10.1049/iet-epa.2012.0334},
  volume       = {7},
  year         = {2013},
}

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