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Starting of DC Motors

Starting of DC Motors: At the time of Starting of DC Motors (n = 0), the induced emf of a motor is zero such that the current drawn from rated…

EMF and Torque Equation of DC Machine

EMF and Torque Equation of DC Machine: EMF and Torque Equation of DC Machine - It was shown in Sec. 5.2 (Fig. 5.14 (a)) that in a dc machine the…

Introduction of DC Motor

Introduction of DC Motor: Introduction of DC Motor is constructed in many forms and for a variety of purposes, from the 3-mm stepper drawing a few μA at 1.5 V…

DC Motor Losses and Efficiency

DC Motor Losses and Efficiency: The Losses and Efficiency of a transformer have been studied in earlier lesson. As in the case of transformers, it is more accurate to determine…

Torque Equation of Synchronous Motor

Torque Equation of Synchronous Motor: Figure 5.36 shows a Torque Equation of Synchronous Motor with a round rotor. The rotor is initially stationary with fixed north-south poles created by dc…

Torque in Round Rotor Synchronous Machine

Torque in Round Rotor Synchronous Machine: Torque in Round Rotor Synchronous Machine - When the stator and rotor windings of a machine both carry currents, they produce their own magnetic…

Rotating Electrical Machines: We Know that electromechanical energy conversion takes place whenever a change in flux is associated with mechanical motion. Speed voltage is generated in a coil when there…

Transformer Testing Methods

Transformer Testing Methods: Two chief difficulties which do not warrant the Transformer Testing Methods by direct load test are: Large amount of energy has to be wasted in such a…