Current Control Scheme of High Speed SRM Using Low Resolution Encoder

Huynh Khac Minh Khoi; Jin-Woo Ahn; Dong-Hee Lee

Current Control Scheme of High Speed SRM Using Low Resolution Encoder

Huynh Khac Minh Khoi

Jin-Woo Ahn

Dong-Hee Lee

Vol. 11, No. 4, pp. 520-526, Jul. 2011

10.6113/JPE.2011.11.4.520

4/2 SRM

Current controller

High Speed

Low resolution encoder

Non-uniform air-gap

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Abstract

This paper presents a balanced soft-chopping circuit and a modified PI controller for a high speed 4/2 Switched Reluctance Motor (SRM) with a 16 pulse per revolution encoder. The proposed balanced soft-chopping circuit can supply double the switching frequency in the fixed switching frequency of power devices to reduce current ripple. The modified PI controller uses maximum voltage, back-emf voltage and PI control modes to overcome the over-shoot current due to the time delay effect of current sensing. The maximum voltage mode can supply a fast excitation current with consideration of the hardware time delay. Then the back-emf voltage mode can suppress the current over-shoot with consideration of the feedback signal delay. Finally, the PI control mode can adjust the phase current to a desired value with a fast switching frequency due to the proposed balanced soft-chopping technology.

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Cite this article

[IEEE Style]

H. K. M. Khoi, J. Ahn, D. Lee, "Current Control Scheme of High Speed SRM Using Low Resolution Encoder," Journal of Power Electronics, vol. 11, no. 4, pp. 520-526, 2011. DOI: 10.6113/JPE.2011.11.4.520.

[ACM Style]

Huynh Khac Minh Khoi, Jin-Woo Ahn, and Dong-Hee Lee. 2011. Current Control Scheme of High Speed SRM Using Low Resolution Encoder. Journal of Power Electronics, 11, 4, (2011), 520-526. DOI: 10.6113/JPE.2011.11.4.520.