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Position Measurements Using Magnetic Sensors for a Shape Memory Alloy Linear Actuator.

Ricardo Cortez Vega¹, Gabriel Cubas², Marco Antonio Sandoval-Chileño³

¹Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas, Instituto Politécnico Nacional, Ciudad de México 07340, Mexico.

Sensors (Basel, Switzerland)

|October 14, 2022

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This study introduces a novel linear actuator using Nickel-Titanium (NiTi) Shape Memory Alloys. It features accurate, contactless position sensing and temperature measurement for reliable performance.

Area of Science:

Materials Science
Mechanical Engineering
Robotics

Background:

Shape Memory Alloys (SMAs) offer unique actuation capabilities.
Accurate position and temperature sensing are critical for SMA actuator control.
Contactless sensing methods can minimize friction and improve reliability.

Purpose of the Study:

To design and implement a linear actuator utilizing NiTi SMAs.
To develop a contactless position sensing system using a magnetic sensor array.
To integrate temperature measurement using thermistors for comprehensive actuator monitoring.

Main Methods:

The actuator design incorporates NiTi SMA wires for linear motion.
Position is measured contactlessly via a magnetic sensor array, processing individual sensor responses.

Keywords:

linear actuator magnetic sensor shape memory alloy temperature sensor

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Temperature is monitored using an array of thermistors.

Main Results:

The contactless magnetic sensor array provides accurate position feedback across the actuator's full range of motion.
Signal conditioning effectively selects the closest sensor for precise readings.
Experimental results demonstrate the system's competitive accuracy and reliability.

Conclusions:

The developed NiTi SMA linear actuator with magnetic sensing is a viable solution for precise motion control.
Contactless magnetic sensing effectively overcomes friction issues associated with traditional methods.
The integrated system offers accurate and reliable performance for various applications.