Rotor Initial Position Estimation Based on sDFT for Electrically Excited Synchronous Motors

Qing-qing Yuan; Xiao-jie Wu; Peng Dai

Rotor Initial Position Estimation Based on sDFT for Electrically Excited Synchronous Motors

Qing-qing Yuan

Xiao-jie Wu

Peng Dai

Vol. 14, No. 3, pp. 564-571, May 2014

10.6113/JPE.2014.14.3.564

Electrically excited synchronous motors

Rotor initial position

Sliding discrete Fourier transform

Quadrant identification

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Abstract

Rotor initial position is an important factor affecting the control performance of electrically excited synchronous motors. This study presents a novel method for estimating rotor initial position based on sliding discrete Fourier transform (sDFT). By injecting an ac excitation into the rotor winding, an induced voltage is generated in stator windings. Through this voltage, the stator flux can be obtained using a pure integral voltage model. Considering the influence from a dc bias and an integral initial value, we adopt the sDFT to extract the fundamental flux component. A quadrant identification model is designed to realize the accurate estimation of the rotor initial position. The sDFT and high-pass filter, DFT, are compared in detail, and the contrast between dc excitation and ac injection is determined. Simulation and experimental results verify that this type of novel method can eliminate the influence of dc bias and other adverse factors, as well as provide a basis for the control of motor drives.

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Cite this article

[IEEE Style]

Q. Yuan, X. Wu, P. Dai, "Rotor Initial Position Estimation Based on sDFT for Electrically Excited Synchronous Motors," Journal of Power Electronics, vol. 14, no. 3, pp. 564-571, 2014. DOI: 10.6113/JPE.2014.14.3.564.

[ACM Style]

Qing-qing Yuan, Xiao-jie Wu, and Peng Dai. 2014. Rotor Initial Position Estimation Based on sDFT for Electrically Excited Synchronous Motors. Journal of Power Electronics, 14, 3, (2014), 564-571. DOI: 10.6113/JPE.2014.14.3.564.