A4 Conference proceedings

Accuracy Study of Frequency Converter Estimates Used in the Sensorless Diagnostics of Induction-Motor-Driven Systems


Publication Details
Authors: Ahonen Tero, Tamminen Jussi, Ahola Jero, Niemelä Markku
Publication year: 2011
Language: English
Related Journal or Series Information: European Conference On Power Electronics And Applications
ISSN: 2325-0313
JUFO-Level of this publication: 1
Open Access: Not an Open Access publication

Abstract
Modern frequency converters allow energy efficient operation of induction-motor-driven systems such as pumps and fans. In addition, they can be used as a sensorless monitoring unit for the pump and fan systems, as shown by previous studies. Sensorless diagnostics of induction-motor-driven systems relies on the accurate estimation of the rotational speed, shaft torque and shaft power of the motor, which is why all frequency converters are not suitable for this use.

In this paper, accuracy of the rotational speed, shaft torque and shaft power estimates is studied by laboratory tests for two different frequency converters. Using the test results, estimation accuracy of a vector- and a direct-torque-controlled frequency converter are compared with each other. The effect of erroneous motor estimates on the pump flow rate estimation is also demonstrated in the paper.

Last updated on 2017-22-03 at 14:15