Induction Motor Unbalanced Magnetic Pull

The unbalanced magnetic pull ump in a three phase generator under no load caused by dynamic and static eccentricity is calculated theoretically. One of the most important causes that lead to fault in the case of induction motors is rotor eccentricity which causes the unbalanced magnetic pull that leads to an increase in the noise level of.

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This is called unbalanced.

Induction motor unbalanced magnetic pull. Analytical expressions of the ump for any pole pair number are obtained. However if the motor is symmetrical with a perfectly centred rotor the radial electromagnetic forces are cancelled out and the tangential ones produce a r. This is called unbalanced magnetic pull ump.

In a fourth article a new stand still frequency response ssfr test method including measurements of damper winding voltage and current is presented. The calculation of unbalanced magnetic pull in synchronous and induction motors abstract. Unbalanced magnetic pull may result in vibration at line frequency one times line frequency as well as the usual twice line frequency vibration.

In an electrical machine both radial and tangential electromagnetic forces are generated. If the rotor of an induction motor is not concentric with the stator then an electromagnetic force is generated in a direction that will increase the eccentricity. If the rotor of an induction motor is not concentric with the stator then an electromagnetic force is generated in a direction that will increase the eccentricity.

If the rotor or stator moves from side to side the point of minimum air gap may move from one side of the motor to the other. Tenhunen a finite element calculation of unbalanced magnetic pull and circulating current between parallel windings in induction motor with non uniform eccentric rotor proceedings of electromotion01 june 19 20 2001 bologna italy pp. The air gap permeance is expressed as a fourier series.

From a resulting rotating unbalanced magnetic pull it is found that the unaffected poles with the same polarity as the affected pole experience an increase in flux density. Unbalanced magnetic pull may be defined as the net sideways force between the stator and rotor of an electric machine resulting from a difference in the air gap flux densities on opposite sides of the machine.

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