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capacitor-start-capacitor-run single-phase motor in this case two capacitors are used one for preliminary and other for running purpose as shown the
functions of the commutator a commutator is a device which under certain conditions changes ac into dc and vice versathe commutator is a form of
copper losses these losses occur because of ohmic resistance of the transformer windings if i1 and i2 are primary and secondary currents
core losses or iron losses these losses having of hysteresis and eddy current losses which happen due to pulsation of flux in the core these losses
the losses occurring in a transformer are-i iron lossii copper
kirchoffs voltage law determines that the algebraic sum of the products of currents and resistances in every of the conductors in any closed path in
kirchoffs current law states that in any electrical network the algebraic sum of the currents meeting at a point or junction is zero which means
battery powered vehiclesused dc series motors are the first choice recently ac motors with frequency changers are being
textile industryhigh speed drives are essential with wide range of control small amp medium motors are employedcommutator motors and synchronous
printing paper industrysynchronous motors are used in grindersdc drives are used for pumping pulp and refining
minesflame proof squirrel cage induction motors are used in coal
metallurgical industry-variable speed dc drives are being use usually now variable frequency ac drives using squirrel cage
marine application-suitably designed one or double speed squirrel cage induction motors are
selection of motors for different engg application1 for cement industry various types of motors for pumps fans conveyors crushers kilns an mills
necessity of a starterfor dc motors when motor is at rest then n0 and due to eb is directly proportional to n so at begin eb
rotor i squirrel -cage rotorii phase-wound or wound-rotor90 of induction motor are squirrel cage type due to this type of rotor has a easiest and
stator it is made up of a number of stampings which are slotted to be given windings the stator carries 3phi windings and is fed from 3phi supply
working principle of dc motora an electric motor is a machine which changes electrical energy into mechanical energyb when a current carrying
synchronous motor can work at any power factor ie lagging unity or at leading power factor synchronous motor when used to better the power factor
step to improve power factorby using static capacitorstatic capacitor is generally used to get better the power factor of the power system as the
causes of low power factorthe major causes of low power factor in the electric supply system are as follows due to reactive load most of the ac
disadvantage of low power factor we know that p v i cos phi for particular amount of power at constant voltage power p and voltage v in
shell type transformers in this type of transformer the iron core surrounds the copper windings the core is in the shape of numeral 8 the
advantages and disadvantages of three phase system over single phase systema in a single phase circuit the power delivered is pulsating in three
in a pulley system the eqn for length of inextensible string is y plus sq root of x2h2constant how to differentiate y plus sq root of x2h2constant