歪波電圧で運転される3相誘導電動機の特性

概要

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Distortive waves are well known to exert ill influences upon the characteristics of induction motor on account of harmonics in the source. Motor generates vibrating torque, excessive heat and noise. Pure sinusoidal wave does not show these phenomena. When stator and rotor current are assumed to consist of first and second amplitude in addition to fundamental, authors show how to calculate stationary and vibrating torque. Also authors show the relation between frequencies of torque and harmonics, the condition of stationary and vibrating torque. General theory leads vibrating torque. Special case of it leads stationary torque and the results identify ones seen in the textbooks. These calculations are made with simple vector analysis. Moreover, authors calculated the instantaneous current of stator and rotor, stationary torque of respective frequency, effective value of stator and rotor current, whole cupper loss. Further authors exemplify the characteristics of stationary torques, instantaneous currents and cupper loss of induction motor driven by cycloconverter in 10, 20, 30 (Hz). In each case, third harmonics are excluded because these harmonics do not generate any torque on account of zero phase sequence. Transient speeds and torques of motor driven by cycloconverter are shown, harmonics being taken into consideration.