Sensorless temperature estimation and control of Peltier devices
Name
77275166-MIT.pdf
Description
Full printable version
Size
1.25 MB
Format
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Checksum (MD5)
0476f86a74667f69e5ba4f1f9321e685
Author(s)
Odhner, Lael Ulam, 1980-
Advisor(s)
H. Harry Asada.
Date Issued
2006
Publisher
Massachusetts Institute of Technology
Abstract
Peltier devices, also known as thermoelectric devices (TEDs), are solid state junctions of two dissimilar materials in which heat transfer and electrical conduction are coupled. A current running through a TED causes heat to flow; likewise, the presence of an external temperature gradient will induce an electrical potential across the TED. The former effect is known as the Peltier effect; the latter is known as the Seebeck effect. While TEDs are used primarily as heat pumps, they can also serve as temperature sensors. This thesis presents the design for a controller which uses a TED to simultaneously sense and control the temperature of a shape memory alloy (SMA) wire. The pulse width-modulating driving circuitry in the controller is capable of measuring the undriven voltage across the TED at a rate of 200 Hz between pulses. A low order ARX model is then used to estimate the SMA temperature. The SMA temperature can be controlled using this estimate. This method will enable the production of large arrays of TED-driven SMA tendon actuators, particularly for large DOF robotic systems.
Description
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2006.
Includes bibliographical references (leaf 26).
Subjects
Mechanical Engineering.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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