find SR •A DC Series Motor with RA=0.3Ω and Rf=0.4Ω draws 35A and runs at 600rad/s...
220 v dc shunt motor has Ra= 0.25 ohms and Rf=120 ohms . At no-load the motor draws a current It=6A. And runs at 1500 rpm. At full-load the motor draws 62 A. the armature reaction at full load reduces the flux by 10%. Determine the rotational losses , motor speed at full-load, the shaft torque and efficiency.
electric machinery chapter dc motor qus= 200V DC series motor has Ra=0.5Ω and Rf=0.2Ω. the current input is 20 A, and the speed is 1000 r/min. if a resistor 0.2 Ω is joined in parallel with the filed winding, find the new speed of the motor for an input current of 20 A. Assume linear magnetization curve
i. The speed of a separately excited dc motor is controlled by a one-phase full-wave converter. The field circuit is also controlled by a full-wave converter, see V supply) Vs pk-150V Ra-0.310 L Rf 152O E-63V α. 1-35A Figure 3 The AC supply voltage to the armature and field converters is one-phase, 150Vpeak, 50Hz. The armature resistance Ra-0.31Ω, the field circuit resistance Rf-152Ω, and the motor voltage constant is Kv-1.3V/A. The armature current corresponding to the load demand la-35A The...
A DC permanent magnet motor draws 5A from a 200V DC source, under no-load conditions, and draws 50A from the same source, and has a speed of 2500rpm at full load. Ra = 1.4Ω. Determine: a) the rotation loss* (W) b) the no-load speed (rpm) c) the output torque (Nm) d) the efficiency of the motor at full load. (*Assume the rotational loss is proportional to speed!)
A DC permanent magnet motor draws 5A from a 200V DC source, under no-load conditions, and draws 50A from the same source, and has a speed of 2500rpm at full load. Ra = 1.4Ω. Determine: a) the rotation loss* (W) b) the no-load speed (rpm) c) the output torque (Nm) d) the efficiency of the motor at full load. (*Assume the rotational loss is proportional to speed!)
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...
P4-17) A 240 V separately exited dc motor has an armature resistance of Ra = 006 Ω, when it is connected to a 240 V supply, it draws 90 A from the supply and rotates at 1200 rpm. Find the torque developed by the motor at this operating condition. If the torque developed is 280 Nm for the same excitation and same supply voltage, then find the speed and armature current. a) b)
A DC motor supplied from 12 V draws 1.25 amps and turns at 1200 RPM when the load torque is 0.1 N.m. What is the efficiency in percent?
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 separately-excited DC traction motor of a metro train is in series connection, i.e., the armature and the field windings are connected in series with a common DC power source. The voltage of the DC power source is I (a) Please show that the angular velocity of the rotor is KT K where o is the is the angular velocity of the rotor, Ra is the resistance of the armature, Rris the resistance of the field windings, T is the...