定数推定機能を付加した誘導機のPGレスベクトル制御法

概要

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General purpose inverters have been widely used for driving induction motor. In this type of inverter, V/f ratio constant control has been utilized. However, this control does not always satisfy all sorts of the specification required from the user side. For example, deterioration of torque in low speed range or large driving speed regulation etc. are problems to be solved. Although to improving this problem, vector control without speed sensor-so-called PG-less control-has been proposed, the system needed complicated observer.In this paper, PG-less vector control system with the estimating functions of the motor parameters is proposed. If the rating parameters of the motor are given, the system automatically estimates the optimum constants for control, and the stable vector control is achieved. This system is also constructed simple control equations.In this paper, system construction, performance characteristics and the principal of estimating motor parameters are discussed. The simulation and the experimental results of the tested machine shows that this method can be expected for the general purpose inverter.