Hyung-Woo Lee, Dae-Hyun Cho, and Kyo-Beum Lee, "Rotor Position Estimation over Entire Speed Range of Interior Permanent Magnet Synchronous Motors," Journal of Power Electronics, in press. -SCIE > Paper

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International Journals Hyung-Woo Lee, Dae-Hyun Cho, and Kyo-Beum Lee, "Rotor Position Estimation over Entire Speed Range of Interior Permanent Magnet Synchronous Motors," Journal of Power Electronics, in press. -SCIE

2021

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This paper presents a method for transitioning between sensorless rotor position estimation methods for an interior permanent magnet synchronous

motor (IPMSM); through the proposed method, rotor position estimation over the entire speed range of the IPMSM is possible. Considering that each

sensorless method governs a different speed range for estimating rotor position and speed with good accuracy, a strategy for transitioning between

two methods is indispensable. In this study, the sensorless method based on extended back electromotive force (EMF) is used for high-speed

operation. In contrast, during low-speed operation, rotor position is estimated using the slope of measured current through the application of the

zero-voltage vector. A weight function is applied to the position and speed information obtained from the two sensorless methods. The combined

information is then used throughout the speed range of the IPMSM. To achieve smooth transition, the weight function is altered based on rotor speed

in the transition region. The effectiveness of the proposed transition method was demonstrated via simulations and experiments.

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