DOI:
https://doi.org/10.14483/22484728.15180Publicado:
2019-07-30Número:
Vol. 13 Núm. 2 (2019)Sección:
Visión InvestigadoraDesign of a magnetic encoder using Hall effect
Diseño de un encoder magnético usando efecto Hall
Palabras clave:
Hall effect, Magnetic encoder, Position control, Position sensor (en).Palabras clave:
Efecto Hall, Encoder magnético, Control de posición, Sensor de posición (es).Descargas
Resumen (en)
We present the design of a magnetic encoder to measure angular position. The proposed encoder includes two Hall sensors in quadrature in a fixed platform. In addition, and over the sensors, there are two permanent magnets in a shaft. The relative motion between the fixed and the movable components generate a voltage variation in the sensors, which serve to generate the approximation of the angular position. We detail the acquisition process and the linearization method, because we consider that these are the most important contributions of this work. Lastly, we show the application of the encoder in the position control of a direct current motor to show the performance of the encoder estimating fast and slow angular position changes.
Resumen (es)
En este artículo se presenta el diseño de un encoder magnético para la medición de la posición angular. El encoder está compuesto por dos sensores de efecto Hall en cuadratura en una plataforma fija. Además, sobre los sensores, y en el eje a medir se ubican dos imanes permanentes con magnetización axial. El movimiento relativo entre el componente fijo y el móvil del encoder genera una variación de voltaje en los sensores. Esta variación da lugar a la aproximación de la posición angular. Se detallan los procesos de adquisición y linealización de los datos, dado que son los aportes más importantes de esta propuesta. Para finalizar se muestra la aplicación del encoder en el control de posición angular del eje de un motor de corriente directa, con lo que se muestra el trabajo del encoder ante cambios lentos y rápidos de posición.
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