7. Draw the equivalent circuit of the shunt type dc motor and obtain the speed torque...
7. Draw the equivalent circuit of the shunt type dc
motor and obtain the speed torque characteristic equation.
Also explain that the dc motor operates stably at all speeds.
Homework Answers
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7. Draw the equivalent circuit of the shunt type dc
motor and obtain the speed torque...
Q1. Draw the equivalent circuits of a separately excited and a shunt DC motor. [20] Q2....
Q1. Draw the equivalent circuits of a separately excited and a shunt DC motor. [20] Q2. Derive the speed-torque relation for a DC motor: [40] 0 = VR, Kø (KØ)??ind Q3. A DC motor's speed can be controlled by either changing the field resistance, changing the armature voltage or changing the armature resistance. Of these three, which one is the best method for DC motor speed control and which is the worst? Give reasons. [40]
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 Qu...
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...
7. Compare the shunt wound de motor and, the series wound dc motor on the basis...
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
separately excited series, shunt, compound DC motor: *Describe how does decreasing the field current IF affect...
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.
HomeWork3 Deadline: Tuesday March 31st, 2019 Problem 1: [10 points] Draw the equivalent circuit o...
HomeWork3 Deadline: Tuesday March 31st, 2019 Problem 1: [10 points] Draw the equivalent circuit of separately excited, shunt, and series DC motors. Problem 2: [50 points A 50 hp, 250 V, 1200 rpm dc shunt motor shown in Figure 1 has an armature resistance of 1 Ω. Its field circuit has a total resistance Ra Rf of 60 Ω, which produces a no-load speed of 1200 rpm. There are 1500 turns per pole on the shunt field winding IL RA...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2 ohm and 2002. When the motor takes 80A rated current at rated conditions. Draw the equivalent circuit and calculate induced torque at 1200rpm. Explain the starting current limiting methods for DC motors. (30 pts) 4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and...
Which type rotor of three-phase squirrel-cage motor has low starting torque, high starting current and good...
Which type rotor of three-phase squirrel-cage motor has low starting torque, high starting current and good running torque? Туре В-Е Type F-V 8. Туре А All above А. В. С. D. Which type of motor is known as a constant speed motor? Series DC Long compound 9. В. Shunt DC А. Short Compound D. С. 10 To what a countertorque is proportional? А. Hysteresis Armature Current Eddy current Shunt Field В. D. For DC machine, what type of field winding...
A 220 V DC shunt motor has an armature resistance, Re-0.1 S2, a field resistance, Ry=100...
A 220 V DC shunt motor has an armature resistance, Re-0.1 S2, a field resistance, Ry=100 12, and negligible rotational losses. Under certain load conditions, the shunt motor runs at 1600 rpm while drawing a total current, I = 100 A. Determine: a. the output power of the motor; b. the output torque in N-m; and, c. the efficiency Without making any changes to the applied voltage or the field, the motor operates with a new M mechanical load that...
A 250-V shunt-connected DC motor runs at 1500 rpm when it is not connected to any...
A 250-V shunt-connected DC motor runs at 1500 rpm when it is not connected to any external load. When the motor is connected to an external load, it draws a line current of 40A. The motor has an armature resistance of 1 ? and a field circuit resistance of 100 ?. Assume that the rotational loss torque is 2 Nm and is independent of the speed (a) Find the line current of the motor when there is no external load....
A type of DC motor which has wide variance in speed based on the mechanical load....
A type of DC motor which has wide variance in speed based on the mechanical load. a. Series Motor. b. Parallel Motor c. Shunt Motor d. Compound Motor.
Q1. Draw the equivalent circuits of a separately excited and a shunt DC motor. [20] Q2. Derive the speed-torque relation for a DC motor: [40] 0 = VR, Kø (KØ)??ind Q3. A DC motor's speed can be controlled by either changing the field resistance, changing the armature voltage or changing the armature resistance. Of these three, which one is the best method for DC motor speed control and which is the worst? Give reasons. [40]
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...
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
HomeWork3 Deadline: Tuesday March 31st, 2019 Problem 1: [10 points] Draw the equivalent circuit of separately excited, shunt, and series DC motors. Problem 2: [50 points A 50 hp, 250 V, 1200 rpm dc shunt motor shown in Figure 1 has an armature resistance of 1 Ω. Its field circuit has a total resistance Ra Rf of 60 Ω, which produces a no-load speed of 1200 rpm. There are 1500 turns per pole on the shunt field winding IL RA...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2 ohm and 2002. When the motor takes 80A rated current at rated conditions. Draw the equivalent circuit and calculate induced torque at 1200rpm. Explain the starting current limiting methods for DC motors. (30 pts) 4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and...
Which type rotor of three-phase squirrel-cage motor has low starting torque, high starting current and good running torque? Туре В-Е Type F-V 8. Туре А All above А. В. С. D. Which type of motor is known as a constant speed motor? Series DC Long compound 9. В. Shunt DC А. Short Compound D. С. 10 To what a countertorque is proportional? А. Hysteresis Armature Current Eddy current Shunt Field В. D. For DC machine, what type of field winding...
A 220 V DC shunt motor has an armature resistance, Re-0.1 S2, a field resistance, Ry=100 12, and negligible rotational losses. Under certain load conditions, the shunt motor runs at 1600 rpm while drawing a total current, I = 100 A. Determine: a. the output power of the motor; b. the output torque in N-m; and, c. the efficiency Without making any changes to the applied voltage or the field, the motor operates with a new M mechanical load that...
A 250-V shunt-connected DC motor runs at 1500 rpm when it is not connected to any external load. When the motor is connected to an external load, it draws a line current of 40A. The motor has an armature resistance of 1 ? and a field circuit resistance of 100 ?. Assume that the rotational loss torque is 2 Nm and is independent of the speed (a) Find the line current of the motor when there is no external load....
A type of DC motor which has wide variance in speed based on the mechanical load. a. Series Motor. b. Parallel Motor c. Shunt Motor d. Compound Motor.
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