Initial rotor position and inductance estimation of PMSMs utilizing zero‑current‑clamping effect

Jing Wang; Jianhu Yan; Zhanfeng Ying

Initial rotor position and inductance estimation of PMSMs utilizing zero‑current‑clamping effect

Jing Wang

Jianhu Yan

Zhanfeng Ying

Vol. 22, No. 1, pp. 50-60, Jan. 2022

10.1007/s43236-021-00340-7

Dead-time

High-frequency voltage signal injection

Inductance estimation

Initial rotor position estimation

Zero-current-clamping

Abstract

The high-frequency (HF) signal injection method can be used for estimating the initial rotor position and the d-q axis inductances of a permanent magnet synchronous machine (PMSM). Low amplitude signal injection is beneficial to keep the rotor stationary and to reduce HF noise. However, it seriously suffers from dead-time. In this paper, the influence of dead-time on the injected signal is analyzed, and a method for estimating the initial rotor position and d-q axis inductances of a PMSM is proposed by utilizing the zero-current-clamping (ZCC) effect. Signal injection is carried out in the three-phase stationary reference frame. Therefore, the analysis of the dead-time effect can be simplified, and the initial rotor position and the d-q axis inductances can be simultaneously estimated. First, the ZCC effect is analyzed in detail when two-phase power switches operate at the same duty ratio. A linear relationship is then built between the injected HF voltage and the current variation. Based on this, the algorithms of the parameter estimations are derived. Moreover, to improve the estimation accuracy, the least square method is used to reduce the influence of the measured errors caused by current sensors. Finally, a PMSM driven experimental system is built and tested to verify the proposed method.

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Cite this article

[IEEE Style]

J. Wang, J. Yan, Z. Ying, "Initial rotor position and inductance estimation of PMSMs utilizing zero‑current‑clamping effect," Journal of Power Electronics, vol. 22, no. 1, pp. 50-60, 2022. DOI: 10.1007/s43236-021-00340-7.

[ACM Style]

Jing Wang, Jianhu Yan, and Zhanfeng Ying. 2022. Initial rotor position and inductance estimation of PMSMs utilizing zero‑current‑clamping effect. Journal of Power Electronics, 22, 1, (2022), 50-60. DOI: 10.1007/s43236-021-00340-7.