誘導機のベクトル制御における二次抵抗補正の一方法

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As to the vector control method, the inverter slip angular frequency ω2 of an induction motor is controlled for the purpose of the output torque being proportional to the torque current. However, the correct vector control requires the precise estimating parameters. If the parameters have a error, there are many problems, i.e., the system stability is reduced or magnetic saturation of iron core occurs. Especially in all of these parameters, the secondary resistance R2 varies extremely with the rotor temperature, and the variation of this parameter has a great influence upon the system characteristics.Some countermeasure has been proposed for estimating the parameter R2 in driving induction motor, but these have many problems, for example, the system construction is complicated, needs other parameters and more correct sensors of current and voltage.This paper proposes the auto-tuning circuit to adjust phase difference between γ-δ and d-q axis due to estimating error of R2 to zero. In the circuit, only a PI compensator is needed in the loop to decide ω1.This paper describes the characteristics of the vector controlled system with the estimating error of R2 by a simulation, and emphasize the requirement of compensation of secondary resistance.The simulation and experimental results of the tested machine show that this method can adjust this difference to zero by using simple compensating circuit. This method is also available for improving characteristics of system not only in the field constant range but also field weakening range.
社団法人電気学会の論文

誘導機のベクトル制御における二次抵抗補正の一方法

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