Explain the characteristics curve of i. Dc shunt motor ii. Dc series motor iii. Dc compound motor
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Explain the characteristics curve of i. Dc shunt motor ii. Dc series motor iii. Dc compound...
separately excited series, shunt, compound DC motor: *Describe how does decreasing the field current IF affect the speed versus voltage characteristic and constant K1 of a separately-excited dc motor. K1=(n2-n1)/(E2-E1) *Describe how does decreasing the field current IF affect the torque versus current characteristic and constant K2 of a separately-excited dc motor? k2=(T2-T1)/(I1-I2) *Briefly describe how the speed varies as the mechanical load applied to the series motor increases, i.e. as the motor torque increases.
7. Compare the shunt wound de motor and, the series wound dc motor on the basis of a) starting torque b) starting urrent c) efficiency d) speed regulation
1. A 300 V compound motor has armature resistance 0.18 Ω, series field resistance 0.3 Ω and shunt field resistance 100 Ω. The rotational losses are 200 W. On full load the line current is 25 A and the motor runs at 1800 rpm. Determine: (i) the developed mechanical power (ii) the output power (iii) the output torque (iv) the efficiency at full load 2. A 120 V series motor has 0.2 Ω field resistance. On full load, the line...
Question 1 (a) Briefly explain the construction and operation of a DC Shunt motor.
Question 1 (a) Briefly explain the construction and operation of a DC Shunt motor.
A 250V DC shunt machine has an armature resistance of 0.5Ω and shunt field resistance of 125Ω, when it is running as a motor, the current taken from the supply is 5A. Calculate the efficiency of the machine i) On no- load ii) As a motor when taking a current of 52A from the supply iii) As a generator when delivering a current of 35A. b) Distinguish between induction motor and synchronous motor.
A 240V DC shunt motor runs at 800rpm at no load. Determine the resistance to be placed in series with the field so that the motor runs at 950rpm when taking an armature current of 20A. The field resistance is 1600 and armature resistance is 0.40. Assume that the pole flux is proportional to the field current Additional Rf= A 240V DC shunt motor runs at 800rpm at no load. Determine the resistance to be placed in series with the...
2. Why it is dangerous to supply power to an unloaded series connected DC motor? Puerto Rico Polytechnic University Department of Electrical Engineering Electromechanical Energy Conversion Systems I Laboratory 89 3. How can you reverse the direction of rotation of a shunt DC motor? 4. Name and explain two methods to control the speed of a DC motor.
A DC Motor 24 of 25 > Part A A shunt-wound DC motor with the field coils and rotor connected in parallel (see the figure) (Figure 1)operates from a 135 V DC power line. The resistance of the field windings, Rf, is 203 2. The resistance of the rotor, R is 5.60 ? , when the motor is running, the rotor develops an emf E. The motor draws a current of 4.90 A from the line. Friction losses amount to...
QUESTIONS Question-3: Draw "speed vs. torque" curve using data in Table-1. The completed graph represents the speed vs. torque characteristics of a typical DC shunt-wound motor. Terax Question-4: Calculate the speed regulation (full load - 12 lbf.in) using the equation: 2-143) 143 (no load Regulation (full load speed) Speed regulation- % Part-II - Motor Efficiency Calculation: Set the dynamometer control knob at its full CW position (to provide the maximum starting load for the shunt-wound motor). Turn on the power...