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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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
- Is true that the DC supply is applied to the rotor windings of a synchronous motor?arrow_forwardA 10kW, 4-pole lap wound, dc shunt generator has a useful flux per pole of0.075 Wb. The armature consist a total of 500 conductors. Calculate theterminal voltage when running at 900 rpm if the armature current and shuntfield resistances are 0.5 ohms and 50 ohms.arrow_forwardA 10kW, 4-pole lap wound, dc shunt generator has a useful flux per pole of0.075 Wb. The armature consist a total of 500 conductors. Calculate theterminal voltage when running at 900 rpm if the armature current and shuntfield resistances are 0.5 and 50 .arrow_forward
- An 8-Pole, simplex lap wound, shunt generator has 800conductors and a flux per pole of 0.025Wb. The armature and shunt field resistances are 1ohms and 45ohms respectively. If a resistance of 11.25ohms is connected as load and the machine is running at 800rpm. Calculate the terminal voltage (in Volts).arrow_forwardSquirrel-cage asynchronous motor, which has never been used before, as a generator in its first use will be run. Does the machine work as a generator? Explain.arrow_forwardWhy small voltage is built up immediately in rotating shunt machine eve without field excitation?arrow_forward
- A 3 phase, 4 pole, 60 Hz induction motor is running at a speed of 1720 rpm. Input power to the motor is 15 kW. Assuming stator loss to be zero, what is the value of rotor copper loss?arrow_forwardWhen 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_forwardThe armature of a 4-pole, 130 slots shunt generator is lap wound with four conductors per slot. The flux per pole is 80 mWb. The armature and shunt field resistances are 0.04 Ω and 50 Ω respectively. Determine the speed of the machine when supplying 400 A at a terminal voltage of 250 V.arrow_forward
- Explain No load test or rotational loss test and Blocked rotor test.arrow_forwardAn 8-Pole, simplex lap wound, shunt generator has 800conductors and a flux per pole of 0.025Wb. The armature and shunt field resistances are 1ohms and 45ohms respectively. If a resistance of 11.25ohms is connected as load and the machine is running at 800rpm. Calculate the terminal voltage (in Watts)arrow_forwardWhy must a synchronous motor never be started when DC excitation is applied to the rotatorarrow_forward
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