3相誘導電動機の瞬時トルクの推定

概要

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Since semi-conductors have been used to control motors, induction motors are more frequently used than DC motors. Usually, squirrel-cage induction motor are used because they are simple and strong in structure and require no maintenance. Analysis of static and transient characteristics requires rotor current, but in squirrelcage induction motors, rotor current cannot be directly measured. In general, sinusoidal source causes no vibrating torque. Distorted source caused by an inverter brings about vibrating torque. There are formal measurements of static torque but not of vibrating torque. Quantities of rotor cannot be directly measured in squirrel-cage induction motors. Because rotor current cannot be measured in such motors, an analysis of torque is not possible on that basis. The purpose of this paper is to analize instantaneous torque with rotor current estimated by minimal-order observer. This requires source voltage, current and motor speed. If rotor current is estimated in this way, rotor flux can also be estimated by curriculation. Analysis of rotor flux is absolutely necessary to drive an induction motor in field oriented control.
大同工業大学の論文