EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Textbook Question
Chapter 27, Problem 3SQ
Which of the following applies to an autotransformer starter with a five-pole starting contactor: open transition or closed transition? Locate in Figure 27–3.
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An automatic starter circuit is to be designed for a shunt motor rated at 20 hp, 240 V, and 75 A. The armature resistance of the motor is 0.12 W, and the shunt field resistance is 40 W. The motor is to start with no more than 250 percent of its rated armature current, and as soon as the current falls to rated value, a starting resistor stage is to be cut out. How many stages of starting resistance are needed, and how big should each one be?
53. A 200 W, 230 V, 50 Hz capacitor-start mo-
tor has the following winding parameters:
Main winding: R = 4·5 Q2 ; X₁ = 3·7 Q
What should be the angle between input
voltage and starting winding current to give
maximum starting torque?
(1) 38.2⁰
(iii) 50-4⁰
(ii) 24-6°
(iv) 32.7°
Chapter 27 Solutions
EBK ELECTRIC MOTOR CONTROL
Ch. 27 - Why is it desirable to remove the autotransformers...Ch. 27 - What is meant by an open transition from start to...Ch. 27 - Which of the following applies to an...Ch. 27 - How are reduced voltages obtained from...Ch. 27 - Prob. 5SQCh. 27 - What is a disadvantage of starting with...Ch. 27 - What is one advantage of using an autotransformer...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 17.A. The arrangement which can NOT be used to control the speed of a universal motor operating from a dc circuit isA. an adjustable external resistance.B. a tapped field winding.C. a solid-state controller. 17.B. A single-phase a-c motor which has both a squirrel-cage winding and regular windings but lacks a shortcircuiter is called aA. conductively compensated repulsion motor.B. repulsion-start motor.C. straight repulsion motor.arrow_forwardDraw an electrical diagram for a Star Delta starter with a forward rotation and reverse rotation switch.arrow_forwardDC Motor Speed Regulation A shunt DC motor Armature resistance is 1 ohm and field coil resistance is 100 ohms. Back emf constant is 9 volts for 100 RPM. The DC supply Voltage is 100 V and it is running with a speed 1000 RPM. What is DC supply current?arrow_forward
- A three-terminal manual starting rheostat has a resistance of 5.2 ohms in its starting resistor. The holding coil resistance is 10 ohms. This starting rheostat is connected to a shunt motor. The resistance of the armature is 0.22 ohm; the resistance of the shunt field is 100 ohms. The line voltage is 220VDC. a. What is the starting surge current taken by the motor? b. What is the current in the holding coil with the moveablew arm in the run position? c. What is the CEMF with the movable arm in the on position if the armature current is 20 amps?arrow_forward2. The nameplate rating of a shunt motor is 150 hp, 600 volts, 205 amp, 1700 rpm. The resistance of the shunt field is 240 ohms and the total armature resistance is 0.15 ohm. Calculate the counter emf.arrow_forwardI need the answer as soon as possiblearrow_forward
- How to avoid the effect of the high current at starting of the Motor? a. variable resistor is connected in series with Armature circuit b. variable resistor is connected in parallel with Armature circuit c. variable resistor is connected in series with field circuit d. None of the above Clear my choicearrow_forwardWhich of the following option are correct for speed control of 3-phase induction motor below the rated speed without decreasing maximum torque capability of the motor? O a only voltage is controlled O b. Only frequency is controlled keeping voltage constant at rated value Oc Both voltage and frequency are controlled Od. All the options are correctarrow_forwardQ/ When a series dc motor is operated without a load, which of the following conditions occurs? * Ans 1- The armature draws excessive current 2- The armature speeds out of control 3- The armature will not turn 4-The voltage requirement increasesarrow_forward
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