How the axial flux of an induction motor can be used?

Author:

Petryna Janusz1

Affiliation:

1. Cracow University of Technology

Abstract

The article contains the results of research within the project to apply unipolar (axial) flux to obtain diagnostic signals carrying the information of: electrical asymmetries of machinery (inter-turn stator short-circuits, cage damages); rotational speed of the rotor and load torque. Inter-turn stator short-circuits can be detected both at starting process time (when they appear most often), as well as in steady states. Detection of rotor cage defects in steady states has a character of a comparative study, and over time, as the defects develop. For standard drives that are powered from the network and work in open systems, by measuring the voltage following a unipolar flux, it is possible to make measurement and recording of motor speed, which usually is almost never provided under industrial conditions. The study shows that a simple in its construction, cheap coil can be a very useful diagnostic tool. The measurements were carried out at the laboratory and motor workplace in the power plant, while in the test station, during the loading, characteristics illustrating the dependence of the torque on the axial flux and on the rotational speed were obtained. A way of using a single measurement to estimate the torque has been proposed. The method is relatively simple to implement and allows for a fully non-invasive determination of the load torque.

Publisher

University of Applied Sciences in Tarnow, Poland

Reference20 articles.

1. Ewert P. Use of Axial Flux in the Detection of Electrical Faults in Induction Motors. IEEE International Symposium on Electrical Machines (SME), 2017, 1-6.

2. Dorrell DG, Thomson WT, Roach S. Analysis of airgap flux, current, and vibration signals as a function of the combination of static and dynamic air-gap eccentricity in 3-phase induction motors. IEEE Transactions on Industry Applications. 1997; 33(1): 24-34.

3. Kokko V. Condition monitoring of squirrel-cage motors by axial magnetic flux measurements. Academic Dissertation. University of Oulu. 2003, Finland.

4. Gołebiowski L, Gołebiowski M, Noga M, Skwarczynski J. Axial flow in 3D FEM model of induction machine. Elektrotechnika i Elektronika. 2006;25(2):147-152.

5. Chmelík K, Foldyna J, Mišák S. Magnetické pole vokolí asynchronního stroje, jeho zjišťování a využití. Electroscope, č. 2. Západočeská univerzita v Plzni. Fakulta elektrotechnická. 2007.

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