Effect of Frequency and Spatial-Harmonics on Rotary and Linear Induction Motor Characteristics
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Effect of Frequency and Spatial-Harmonics on Rotary and Linear Induction Motor Characteristics

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      A computer analysis is made of the effect of current and MMF airgap harmonics on the output characteristics of rotary and linear induction motors. The current harmonics accompanying thyristor-control operation are evaluated by Fourier analyzing the primary current waveforms. The agreement between the computed harmonic amplitudes and those measured on an equivalent Wye-connected rotary induction motor is reasonably good. The calculated torgue harmonics, which are generally small compared with the fundamental torque, tend to be maximum at unity motor slip and at large thyristor hold-off angles. The reduction in the output thrust of linear induction motors caused by end-effect waves is calculated for different values of circuit damping constant. The results indicate a considerable negative thrust contribution due to the end-effect waves in the region of small motor slip or synchronous speeds. A family of thrust-slip characterstics is presented for a typical linear induction motor illustrating the combined effect of frequency harmonics and spatial end-effect waves on the output perfromance of the motor.
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