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3 results on '"Mengwei Li"'

1. Speed sensorless identification of the rotor time constant in induction machines

Author

Campbell, Mengwei Li, Chiasson, John, Bodson, Marc, and Tolbert, Leon M.

Subjects
Induction electric motors -- Measurement, Induction electric motors -- Analysis, Parameter estimation -- Methods, Rotors -- Usage
Abstract

A method is proposed to estimate the rotor time constant [T.sub.R] of an induction motor without measurements of the rotor speed/position. The method consists of solving for the roots of a polynomial equation in [T.sub.R] whose coefficients depend only on the stator currents, stator voltages, and their derivatives. Experimental results are presented. Index Terms--Induction motor, parameter identification, rotor time constant. Digital Object Identifier 10.1109/TAC.2007.894548

Published
2007

2. A Differential-Algebraic Approach to Speed Estimation in an Induction Motor

Author

Marc Bodson, John Chiasson, Mengwei Li, and Leon M. Tolbert

Subjects
Electronic speed control, Polynomial, Observer (quantum physics), Stator, Angular velocity, Computer Science Applications, law.invention, Quantitative Biology::Subcellular Processes, Control and Systems Engineering, Control theory, law, Electrical and Electronic Engineering, Differential algebraic equation, Induction motor, Machine control, Mathematics
Abstract

This note considers a differential-algebraic approach to estimating the speed of an induction motor from the measured terminal voltages and currents. In particular, it is shown that the induction motor speed /spl omega/ satisfies both a second- and a third-order polynomial equation whose coefficients depend on the stator voltages, stator currents, and their derivatives. It is shown that as long as the stator electrical frequency is nonzero, the speed is uniquely determined by these polynomials. The speed so determined is then used to stabilize a dynamic (Luenberger type) observer to obtain a smoother speed estimate. With full knowledge of the machine parameters and filtering of the sensor noise, simulations indicate that this estimator has the potential to provide low speed (including zero speed) control of an induction motor under full rated load.

Published
2006

3. A Differential-Algebraic Approach to Speed Estimation in an Induction Motor.

Author

Mengwei Li, Chiasson, John, Bodson, Marc, and Tolbert, Leon M.

Subjects
*INDUCTION motors, *SPEED, *MOTION, *NUMERICAL analysis, *DIFFERENTIAL-algebraic equations, *INDUCTION machinery, *ALTERNATING current electric motors, *ELECTRIC potential, *DYNAMICS
Abstract

This note considers a differential-algebraic approach to estimating the speed of an induction motor from the measured terminal voltages and currents. In particular, it is shown that the induction motor speed w satisfies both a second- and a third-order polynomial equation whose coefficients depend on the stator voltages, stator currents, and their derivatives. It is shown that as long as the stator electrical frequency is nonzero, the speed is uniquely determined by these polynomials. The speed so determined is then used to stabilize a dynamic (Luenberger type) observer to obtain a smoother speed estimate. With full knowledge of the machine parameters and filtering of the sensor noise, simulations indicate that this estimator has the potential to provide low speed (including zero speed) control of an induction motor under full rated load. [ABSTRACT FROM AUTHOR]

Published
2006
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