Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 53, Problem 5SQ
To determine
Explain the reason for usage of larger shaft on a gear reduction motor than the shaft of a standard motor.
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1 - why does the speed fall slightly when the d.c. shunt motor is loaded?
2- What is the effect of armature reaction in on the speed of the motor?
3- Discuss the behavior of the efficiency output power curve?
4 - Enumerate different losses which take place in a loaded shunt motor ؟
A DC shunt motor has full load rating of 30 Hp, 230 Volts, 57.1 Amperes, 1,400
rpm. The armature circuit resistance is 0.15 Ohm and the field circuit resistance is
120 Ohms. Neglecting the effect of armature reaction, determine the no-load
speed.
Armature resistance of a 230V shunt motor is 0.6 Ω and no load current is 2.5A. When the rotor is loaded it is taking armature current of 60A. The speed is 1200rpm.Estimate the back emf for loaded conditions.
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Electric Motor Control
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- Why is the starting torque per A of starting current of a wound-rotor motor higher than that of a squirrel-cage motor although the starting current is less?arrow_forwardExplain: a). Speed characteristics of dc series motor along with suitable diagram. b). Speed characteristics of dc shunt motor along with suitable diagram.arrow_forwardWhy is the starting torque of a wound-rotor motor higher per ampere of starting current than that of a squirrel-cage motorarrow_forward
- The input current to a 220 V, short-shunt compound motor at no-load is 6 A. The shunt field resistance is 220 ohms, the armature resistance is 0.10 ohm and the series field resistance is 0.08 ohm. What is the stray power loss?arrow_forwardA 200-V, 5 kW 1800 rpm, self-excited, long-shunt generator is operating at rated condition. The generator parameters expressed in ohms are: armature = 0.15, series = 0.10, and shunt = 250. Assuming 2 V as total brush drop, determine the armature current in amperes at full load.arrow_forwardArmature resistance of a 230V shunt motor is 0.6 Ω and no load current is 2.5A. When the rotor is loaded it is taking armature current of 60A. The speed is 1200rpm.Estimate the noload speed of a motor.arrow_forward
- 1-D.C. shunt motor maintains a more constant speed under varying load. (True or False) 2-Dc shunt motor is best suited where low starting torque is required. (True or False) 3-The speed of d.c series motor is increased if the armature current is increased. (True or False)arrow_forwardWhat is the function of starter for medium and large size Induction Motors?arrow_forwardCan you solve? If the Applied Voltage of a DC Shunt motor is halved with the load torque doubled, the armature current will be calculate ?arrow_forward
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