PLL 方式을 利用한 三相誘導 電動機의 速度制御 = Speed Control of Three-Phase Induction Motor by Emploging PLL System

다국어 초록 (Multilingual Abstract)

The study of the speed control of induction motor driveusing digital phase locked loop is discussed.
The inherent limitation of low circuit commutated (dv/dt), which makes the triac circuit somewhat unreliable, hase been overcome by suitably designing the sunbber circuit. The closed loop speed regulation of the system is then investigated by employing digital phase-locked loop scheme. Compared to the conventional method with antiparallel SCR's and analog servo, the present scheme is somewhat simpler, more economical, and extreme precision in speed control is possible. A complete model of the speed control system bas been designed and experimentally evaluated in the laboratory.