Method of testing rotor bars in a squirrel cage electric motor

Details Method of testing rotor bars in a squirrel cage electric motor Method of testing rotor bars in a squirrel cage electric motor

G - Physics

01

R

G01R 31/34 (2006.01)

Patent

CA 2292341

A method of testing rotor bars in a squirrel cage electric motor. An electric current is passed through a rotor cage, so that current flows through the rotor bars being tested. A relative strength of flux generated by the electric current passing through the rotor bars is compared. A marked difference in flux strength indicates a broken rotor bar. The method is of sufficient resolution as to leave no doubt as to when a rotor bar is damaged. By way of example, in one test a broken rotor bar recorded a reading of 25 millivolts, as compared with readings of 140 millivolts for all of the other rotor bars.

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