Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 40, Problem 4SQ
When the rotor and stator fields lock into step, why may the reading of the AC ammeter decrease?
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iA 4-pole, DC machine has 144
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Chapter 40 Solutions
Electric Motor Control
Ch. 40 - What are the two basic functions of synchronous...Ch. 40 - Prob. 2SQCh. 40 - If all of the control circuits are ACand DC is not...Ch. 40 - When the rotor and stator fields lock into step,...Ch. 40 - Prob. 5SQCh. 40 - Prob. 6SQCh. 40 - In Figure 402, approximately what is the...Ch. 40 - Why are the AC ammeter and DC meter necessary in...Ch. 40 - Prob. 9SQ
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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
- A 4-pole, D C machine has 144 slots in the armature with two coil-sides per slot, each coil has two turns. The flux per pole is 20 m Wb, the armature is lap wound and if rotates at 720 rpm, what is the induced emf (i) across the armature (ii) across each parallel path?arrow_forwardA 4 pole , lap wound dc shunt generator has a useful flux per pole of 0.07 Wb. The armature winding consists of 220 turns each of 0.004ohms resistance. Calculate the terminal voltage when running at 900 rpm if the armature current is 50 Aarrow_forwardwhat is the conclusion for the concepts of rotating amature and rotating field in an alternator?arrow_forward
- When the armature current of a 220 Volt DC shunt motor is 40 Amperes, when the magnetic flux suddenly decreases by 10%, armature current increases to 80 Amper, which is the armature winding resistance of the motor?arrow_forwardAn induction motor develops rated torque with a slip of 3.5% when the rotor is cold. If the rotor resistance is 20% higher when the motor is at normal running temperature, at what slip it will develop rated torque?arrow_forwardThe DC shunt generator with the terminal voltage 300 V, armature drop 8 V and the each brush drop 2 V, then the value of generated emf isarrow_forward
- A 4 pole, 500V shunt motor has 720 wave connected conductors on its armature. The full load armature current is 60A and flux per pole is 0.03Wb. The armature resistance is 0.2Ω and contact drop per brush is 1V. What is the back emf? What is the developed torque?arrow_forwardwhy the slip of induction motor is never zero.arrow_forwardThe rated frequency of squirrel cage motor is 50 Hz. The synchronous rotation speed of the magnetic field in the machine is 600 rpm. How many pole pairs does the machine have? What is the rated rotation speed if slip value is 3.33 %? Number of pole-pairs Rated rotation speed rpmarrow_forward
- Why dc motors change its direction of rotation as the sign of input voltage to it gets changed?(Can you explain it to me using the concept of Fleming's left hand rule?)arrow_forwardThe voltage induced by a 6-pole DC generator running at 600 [RPM] with 100 slots on the armature and each armature coil has 4 turns with a flux per pole of 0.01 [Wb] isarrow_forwardI need the answer as soon as possiblearrow_forward
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