How an induction motor works by equations and physics. The rotor will constantly be turning to align its magnetic field with that of the stator field. Induction motor equations engn1931f spring 2017 2 let. There are two types of induction motors, one with wound type rotor, also called slipring motor and another one with squirrelcage rotor. This final thesis will mostly be dedicated to induction motors but also to synchronous permanent magnet and reluctance motors. The starting current of a motor falls between the locked rotor value when the rotor begins to turn.
Winding design, modeling, and control for polephase modulation induction motors. The 3phase set of currents, each of equal magnitude and with a phase. S l r the flux in the singleturn coil on the rotor surface is. In general, the induction motor is cheaper and easier to maintain compared to other alternatives. The induction motor is made up of the stator, or stationary windings, and the rotor. The induction motor model is created according to a group of standard equations current, voltage, power, efficiency, speed 1, p 388 or 2, p 167p. For reason of economy, most houses, offices and also rural areas are supplied with single phase a. Induction motor rotor dynamic balancing case study. Pdf thermal performance analysis of induction motor. For some large induction motors with low starting voltages or with high inertia loads and long starting times, the starting time may exceed the allowable locked rotor. Therefore, the stator heating is reduced when the motor accelerates. Class b squirrelcage induction motor characterized by normal.
L r s and be the angular velocities of the magnetic field line frequency, rotor, and slip respectively. Induction motor rotor dynamic balancing case study cbm. This document is intended to provide a brief explanation of how electric motor acceptance vibration analysis tests combined with dynamic balancing jobs increase the life expectancy of rotating machinery. In fact, an induction motor can be treated as a rotating transformer i. Induction motor theory jerry bednarczyk, pe course content introduction the ac induction motor is well suited to applications requiring constant speed operation.
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