Dc Machines Essay

ECNG2000 – Electromechanical Energy Alteration

Tutorial some – DC Machine

1 . Describe operation of POWER machine (motor and generator) using illustrations. Specifically describe the purpose of: a. brushes d. armature turning b. divided ring commutators e. effect of back emf (in operation) c. field winding installment payments on your Draw the different configurations of DC equipment a. shunt c. independently excited m. series three or more. Develop, applying Kirchhoff's laws and regulations, equation to get Ea (armature voltage) in both car and making mode. some. Describe 3 (3) ways of speed control in POWER machines. your five. A shunt dc motor unit has G poles and is rotating by speed In rpm. The device windings are lap twisted. There are z . armature conductors and a parallel pathways. The debordement developed is usually ɸ webers per rod. Derive an expression for the armature volts developed with regards to ɸ, D, z, s and a. 6. A 30 hp, 230 Sixth is v, 1150 rpm shunt motor has four poles, 4 parallel paths and 882 armature conductors. The colonne circuit amount of resistance is zero. 170 . At ranked speed and rated outcome the armature current is definitely 110 A and the field current can be 2 . a couple of A. Estimate: a. the electromagnetic rpm b. the flux per pole c. the rotational losses deb. the effectiveness e. the shaft insert f. the field flux is decreased by 15% of its original worth by means of a field rheostat. Decide the new functioning speed. six. A independently excited power motor when operated for constant flux has an armature resistance of just one. 03 Ω. When the electric motor is operated at no load via a 55 V source, it grows a acceleration of 2100 rpm and draws a supply current of 1. 2 A. Decide: a. the numerical benefit of Ka b. the no weight rotational losses c. the electromagnetic rpm developed by the motor g. the output power of the motor unit when operating at 1700 rpm by a forty-eight V supply 8. A 30 HEWLETT PACKARD, 250 Sixth is v, 1150 rpm shunt motor unit has four poles. You will find 1200 colonne conductors. The armature is usually lap wounded and includes a circuit amount of resistance of 0. 18 . At rated speed and rated end result the armature current is 100A and...



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