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FAM control of induction motor
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<h2 id="electromagnetic-transients">Electromagnetic transients</h2> <p>To obtain very quick torque control response in induction motor, it is required to suppress electromagnetic transients which might be caused by the control. Then it is necessary to investigate the electromagnetic transients of an induction motor. Within the induction motor, the largest inductance is the exciting inductance of exciting reactance. Exciting current flows there. If it is accompanied by any transient, delay time constant will be very large. it is necessary to avoid transients of exciting current. It is therefore necessary to maintain continuity of amplitude and phase of exciting current. </p> <h2 id="types-of-control">Types of control</h2> <p>FAM control of induction motor torque has two types of control namely current control and voltage control. Constant exciting current produces good linearity's between torque and slip frequency. In current control, the primary current is the control input to the induction motor whereas the primary terminal voltage is the control input in voltage control. Two transient phenomena are associated with induction motor operation. One is the mechanical transient of the dynamic system driven by induction motor and the other is the electromagnetic transient within the induction motor. In the first, speed and position of the motor shaft are state variables whereas in latter voltage, current, magnetic field are the state variables. Even though the two systems are interconnected but they can be treated separately. In numerical analysis of electromagnetic transients, it is assumed that the related dynamic state variables are constant and the instantaneous value of the motor torque is found and is fed into the analysis of transients in the dynamic system. </p> <h2 id="performance">Performance</h2> <p>In FAM control, torque can be controlled by the vector of secondary current.FAM control provides the induction motor with very superior steady state performances based on its T equivalent three circuits which behave same when viewed from primary terminals but differ due to different phenomena occurring in the secondary side. </p> <ul><li>Yamamura, S.; Yasui, M. (May 1955). "Transient torque of induction motors". <i>JIEE Japan</i>. 75: 493.</li> <li>Yamamura, S.; Nakagawa, S. (1984). "Voltage type control of induction motor". <i>Trans.BIEE Japan</i>. 104-B: 449.</li></ul>