g) Explain the differences between shunt-winding and repulsion-start type universal motors.
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Q: (B) / Explain the speed control methods of DC shunt motor.
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Q: 28/ How can the speed of a shunt dc motor be ontrolled? Explain in detail.
A:
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- Explain the construction and working principle of armature-controlled DC servomotor. Draw block diagram also.Describe the merits of buckhholz relayA 200V long-shunt generator delivers 100A, has an armature resistance of 0.050, a series field resistance of 0.250 and a shunt field resistance of 2000. If a brush contact drop of 2.5V IS considered, what will be the developed power inside the armature of the machine?
- A shunt generator delivers full-load current of 200A at 240V, the shunt field resistance 60Ω and full load efficiency of 90%. Determine the armature resistance.A non–salient pole, Y-connected, three-phase,two-pole synchronous machine has a synchronousreactance of 7Ω and negligible resistance androtational losses. One point on the open-circuitcharacteristic is given by Vo = 400 V (phase voltage)for a field current of 3.32 A. The machine is to beoperated as a motor, with a terminal voltage of 400 V(phase voltage). The armature current is 50 A, withpower factor 0.85, leading. Determine Eb, fieldcurrent, torque developed, and power angle δ.What should the parameters K and K1 be in order for the following (finite value) steady-state errors of the closed loop control systems to be ess = 0.02?
- The armature, series field and shunt field resistances of a 125kW, 250V long shunt cumulative compound dc generator are 0.025-ohm, 0.01 ohm and 30 ohms, respectively. If the stray power loss at rated load is 5kW, determine the motor brake horsepower required to drive this machine. Assume a brush drop of 2V and a stray load loss of 1% of the output.Describe the main advantage of GTO over thyristor.Manual Control: Design a dc motor circuit to drive an assembly line consisting of a conveyor belt moving horizontally. The load on the belt varies depending on the number of goods being moved. The load torque seen by the motor varies from a maximum of 20 Nm to a minimum of 5 Nm. At all loading conditions, the speed of the motor must be maintained constant and equal to 150 rpm. a. To achieve the required operation, the armature voltage of the motor is adjusted by a single-phase, full-wave, ac/dc converter. The input voltage and frequency to the converter are 240 V (rms) and 50 Hz. (Hint: Motor type, Motor rating, α range, Supply voltage, and frequency...etc) Automatic Control: Modify the design to automatically adjust the voltage to maintain the speed equal to 200 rpm within the specified torque range. (Hint: control variable, controller type, connection, controller weights..etc)
- Answer what you have learned.a. Define and give the construction of a synchronous motor.b. Discuss the working principle of a synchronous motor.c. Give the characteristic feature and the application of SM.In the closed loop control system shown in the figure, the maximum overshoot is M <10%, the rise time tr <0.4 s and the settlement time ts <1s. Design a PD controller to meet these criteria.A 200V shunt generators has an armature resistance of 0.020 and a shunt resistance of 500. At rated load, the driving engine develops 62.25Hp. If the SPL amount to 1600W, determine the load power (in watts).