Improvement in Control Performance of a Servo System Compensating Bandwidth Variations at Low Speed

Young-Eun Ji; Je-Wook Park; Seon-Hwan Hwang; Kwang-Ryul Baek; Jang-Mok Kim

Improvement in Control Performance of a Servo System Compensating Bandwidth Variations at Low Speed

Vol. 10, No. 4, pp. 382-387, Jul. 2010

10.6113/JPE.2010.10.4.382

Bandwidth variation

Low speed

PID gains

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Abstract

This paper presents a novel design method for determining the PID gains of a speed controller for a servo system compensating variations in bandwidth at a low speed. The variations in bandwidth of a speed controller are measured at a low speed and the relationship between the bandwidth and the damping ratio are verified by determining the location of the closed loop pole. The proposed algorithm uses the z-transform of a plant and speed controller and applies the time-varying sampling method for determining the PID gains of the speed controller at low speed. The magnitude and the phase condition are considered for finding a suitable control gain. The usefulness and effectiveness of the proposed method is demonstrated through experimental results such as low speed control and robust disturbance responses.

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Cite this article

[IEEE Style]

Y. Ji, J. Park, S. Hwang, K. Baek, J. Kim, "Improvement in Control Performance of a Servo System Compensating Bandwidth Variations at Low Speed," Journal of Power Electronics, vol. 10, no. 4, pp. 382-387, 2010. DOI: 10.6113/JPE.2010.10.4.382.

[ACM Style]

Young-Eun Ji, Je-Wook Park, Seon-Hwan Hwang, Kwang-Ryul Baek, and Jang-Mok Kim. 2010. Improvement in Control Performance of a Servo System Compensating Bandwidth Variations at Low Speed. Journal of Power Electronics, 10, 4, (2010), 382-387. DOI: 10.6113/JPE.2010.10.4.382.