7. Compare the shunt wound de motor and, the series wound dc motor on the basis...
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. 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.
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.
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...
A shunt de motor is rated at 6kW, 120V and 1200 r/min has a magnetization curve as shown in Figure 1. The armature resistance is 0.189 and the field resistance is 2002 with and adjustable field resistance of 0 to 4002. The shunt de motor has rated line current of 50A when supplying rated voltage. (a) Determine the value of the adjustable field resistance so that the motor operates at no- load speed of 1200 r/min. [5 marks] (b) Assuming...
A 30 hp, 240 V, 1150 rpm de shunt motor operating at rated conditions has an efficiency of 88.5%. The armature circuit resistance and field circuit resistance are 0.096 Ω and 936 Ω respectively. Calculate the following: (a) the armature current; b) the output torque (c) the mechanical developed power (d) the mechanical developed torque; and, e) the external resistance required in series with the armature to limit the starting torque to 200 % of rated torque. If the load...
Explain the characteristics curve of i. Dc shunt motor ii. Dc series motor iii. Dc compound motor
In a shunt-wound dc motor with the field coils and rotor connected in parallel (see the figure (Figure 1)), the resistance Rf of the field coils is Rf = 103 Ω and the resistance Rr of the rotor is Rr = 5.5 Ω. When a potential difference of V = 120 V is applied to the brushes and the motor is running at full speed delivering mechanical power, the current supplied to it is 4.90 A. Part A.) What is...
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, 10 KW, 1200 rpm dc shunt motor has a full load efficiency of 80 percent. Its field and armature resistances are 110 ohms and .25 ohm respectively. Calculate the value of the resistance to be inserted in series with the armature and the power lost in the armature circuit to reduce the speed to 80 percent when the load torque is constant regardless of the speed.