歪波・不平衡電圧で運転される3相誘導電動機のトルク特性

概要

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In sinusoidal source induction motor generates static torque, small copper loss, shows high efficiency. Semiconductors have enabled us to change freely voltage and frequency but harmonics distorts voltage. Voltage is unbalanced in heavy load. Sometimes voltage is distorted and unbalanced simultaneously. Distorted or unbalanced source above mentioned exirts ill influence upon the characteristics of induction motor. In distorted source the same harmonics of stator and rotor current generate harmonious static torques. Different harmonics of stator and rotor current generate resultant static torques and vibrating torques whose frequences are difference between stator and rotor current multiplyed by fundamental angular frequency. In balanced source distorted wave contains zero, positive and negative phase sequence. Zero phase sequence does not generate torque. Positive phase sequence generates positive torque. Negative phase sequence generates negative torque. In unbalanced source zero phase sequence disappears. Each harmonics has positive and negative phase sequence. Second harmonics torque appears. This paper shows the following torques of induction motor in distorted and unbalanced source. 1) fundamental and harmonious static torque 2) all the vibrating torques theoritically concerned 3) the amplitute of second harmonious vibrating torque with increasing load