Title page for ETD etd-02052004-221451

Type of Document Master's Thesis
Author Lepple, Charles
Author's Email Address clepple+thesis@ghz.cc
URN etd-02052004-221451
Title Implementation of a High-speed Sinusoidal Encoder Interpolation System
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Kachroo, Pushkin Committee Chair
Abbott, A. Lynn Committee Member
VanLandingham, Hugh F. Committee Member
  • brushless motor control
  • velocity observer
  • ellipse-fitting
  • sinusoidal encoder feedback
Date of Defense 2004-01-23
Availability unrestricted
In order to meet higher performance demands on brushless motor controllers, motor feedback signals must meet correspondingly higher standards. Brushless motor controllers require angular feedback for motor commutation, and generally for one or more of the following: torque, velocity or position regulation. These feedback categories impose different requirements on the control system. In many brushless motor applications, sinusoidal encoders have significant advantages over square-wave encoders. Signal processing techniques for sinusoidal encoder feedback signals are considered in the context of a brushless motor positioning system. In particular, a method is presented for correcting gain and offset measurement errors based on ellipse-fitting techniques.
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