Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 25, Problem 8SQ
To determine
List the two factors used to find the rotational speed of a rotating magnetic field.
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Chapter 25 Solutions
Electric Motor Control
Ch. 25 - Prob. 1SQCh. 25 - When can full-voltage starting be used?Ch. 25 - Name the simplest, most rugged, and most reliable...Ch. 25 - Define the term slip.Ch. 25 - When the voltage is reduced to start a motor, what...Ch. 25 - Why is it more advisable to start some machines at...Ch. 25 - Prob. 7SQCh. 25 - Prob. 8SQCh. 25 - Prob. 9SQCh. 25 - Prob. 10SQ
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- 4. A 4-pole, lap-wound armature has 144 slots with two coil sides per slot, each coil having two turns. If the flux per pole is 20 mWb and the armature rotates at 700 rpm, what is the induced voltage?arrow_forwardA4-Pole, duplex wave-wound de generator, has 144 slots with 2 coils per slot, each having two turns. If the flux per pole is is 20mWb and the armature rotates at 1500 rpm and the armature develops a power of 25kW, what will be the current in each path (in Amp)?arrow_forwardHow is a rotating magnetic field produced in a three-phase induction motor? Explain itwith the help of suitable diagrams.arrow_forward
- Solve it quicklyarrow_forwardA 3-phase, 6-pole, 25 Hz, Y-connected AC generator has a stator with 48 slots, each slot contains 20 conductors. The coils of each phase are connected in series. The flux density is 0.5 T. What is the speed of rotation of the stator magnetic field in RPM? Answer: The speed is: RPM.arrow_forwardA permanent magnet dc motor has rotor radius of 1.3cm,magnetic thickness of 0.25cm and gap length of 0.05cm.The magnetic flux density in the motor is.arrow_forward
- A magnetic circuit with a cross-sectional area of 20 cm? is to be operated at 50 Hz from a 120 V rms supply. The number of turns required to achieve a peak magnetic flux density of 1.8 T in the core isarrow_forwardA 4-Pole, duplex wave-wound de generator, has 144 slots with 2 coils per slot, each having two turns. If the flux per pole is is 20mWb and the armature rotates at 1500 rpm and the armature develops a power of 25kW, what will be the value of its constant "K" for this machine?arrow_forwardBriefly explain what is Ampere's circuit law in Magnetostatic Fields.arrow_forward
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