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The magnetic air gap radial force waves in a three-phase induction motor excited with a nonsinusoidal supply from a solid-state converter are investigated analytically, taking into account the interaction between the flux density waves due to the harmonic currents. A simple method for the prediction of the frequencies and origins of the magnetic force components paused by the harmonic currents is presented. Analytical results are substantiated by noise tests.
Date of Publication: Jan. 1980