Low-Cost Servomotor Driver for PFM Control

Sensors
David Aragon-JuradoFernando Perez-Peña

Abstract

Servomotors have already been around for some decades and they are extremely popular among roboticists due to their simple control technique, reliability and low-cost. They are usually controlled by using Pulse Width Modulation (PWM) and this paper aims to keep the idea of simplicity and low-cost, while introducing a new control technique: Pulse Frequency Modulation (PFM). The objective of this paper is to focus on our development of a low-cost servomotor controller which will allow the research community to use them with PFM. A low-cost commercial servomotor is used as the base system for the development: a small PCB that fits inside the case and allocates all the electronic components to control the motor has been designed to replace the original. The potentiometer is retained as the feedback sensor and a microcontroller is responsible for controlling the position of the motor. The paper compares the performance of a PWM and a PFM controlled servomotor. The comparison shows that the servomotor with our controller achieves a faster mechanism for switching targets and a lower latency. This controller can be used with neuromorphic systems to remove the conversion from events to PWM.

References

Apr 18, 2007·IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society·Jake J Abbott, Sanford G Meek
Jun 6, 2012·Sensors·Angel Jimenez-FernandezAnton Civit-Balcells
Aug 13, 2013·IEEE Transactions on Biomedical Circuits and Systems·Juan Antonio Lenero-BardalloPhilipp Hafliger

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