Abstract

This paper proposes a sensorless control method for voice coil actuators (VCA). The position and velocity states of the VCA are estimated using a sliding mode observer (SMO). The positioning of the VCA is achieved with a sliding mode controller (SMC). A designed driver is used to control the VCA. The driver is in an H-bridge structure. Current measurement can be taken from each branch of the H- bridge. The drivers switching signals are provided by a microprocessor. Additionally, the microprocessor processes current measurements and runs the SMO/SMC algorithms. SMO is updated only with the current measured from the coil inside the VCA. Experimental studies are conducted with a constructed VCA. The critical parameters of the model used within the SMO are tuned through experiments. Experimental results show that the SMO observer can successfully perform position and velocity estimation. It is observed that the SMC, which performs positioning with the system states obtained from the estimation, can also position the VCA.

References

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