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Fusion of Low Resolution Encoder and Angular Velocity Estimator in Induction Motor Control
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| Author(s) |
Janne Davidsainen; Seppo J. 0vaska |
| Abstract |
During the last few years, much effort has been
put on the development of the sensorless induction motor
control. Many sophisticated methods to control the induction
motor without an explicit angular velocity feedback
have been presented in the literature. Despite of the development
of these sensorless control techniques, the angular
velocity feedback is still needed with drives requiring precise
velocity or torque control in low speeds and standstill. When
the electrical velocity of a loaded induction motor is near
zero, inaccuracies on motor parameters causes error in flux
calculation biasing the response of the sensorless control.
This paper presents the results of combining the sensorless
control techniques with a low resolution encoder for more
precise velocity control. The averaged sensorless velocity
estimate and the measured velocity are compared after each
encoder pulse registration. The velocity estimate is then
corrected by the filtered difference between the estimated
and measured velocities. Our straightforward method is
tested with a loaded 15 kW induction motor and a low cost
encoder giving only 8 or 16 pulses per revolution. The
results show that robust control over the whole velocity
range is achieved. |
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| Filename: | Unnamed file |
| Filesize: | 596 KB |
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| Type |
Members Only |
| Date |
Last modified 2006-02-20 by System |
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