An Analysis of Steady State Characteristics of Induction Motor Controlled by Thyristors

Recently thyristors, used for the control of induction motor, not only expand the range of application to the motor but also improve operating efficiency and continuous control. However they cause a few problems; ripples of torque and angular velocity due to a lot of harmonics. Therefore we need to grasp their exact amounts and to produce a generalized equation that we can handle easily. In connection with the former necessity, we have been able to analyze the model simulating induction motor by means of digital computer. On the other hand, having been already proposed in response to the latter one, some approximate equations are not satisfactory considering the ease of treatment, accuracy and range of application. Accordingly in this paper, analytic equations for induction motor controlled by thyristors are obtained by transformation of three phase quantities into a vector and its characteristics are indicated for studying approximate equations