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Performance Analysis of Fast Current Loop (FCL) in Servo Drives

February 22, 2019

High performance motor drives in servo control applications are expected to provide high precision and high bandwidth control of current, speed and position loops for superior control of end applications such as robotic arm, CNC machines, and so forth. Since the current loop makes up the inner most control loop, it must have a high bandwidth to enable the outer speed or position loops to be faster. Hence, a high bandwidth FCL is needed in high performance industrial servo control applications. However, the delay due to ADC conversion and algorithm execution limit the current controller bandwidth to about a tenth of the sampling frequency.

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