Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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How can the speed of a shunt DC motor be controlled
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- An 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_forwardwhy the slip of induction motor is never zero.arrow_forwardA 15 HP 220 V shunt motor has an armature resistance of 0.07 ohm and shunt a shunt resistance of 200 ohms. The overall efficiency at rated output is 89 %, What is the rotational loss?arrow_forward
- A 240 V, DC series motor takes 44 A, the armature and field resistances are 0.8 Q and 0.05 Q respectively, the back e.m.f of the motor is ..arrow_forwardIn your opinion, what happens to the rotor speed and current when mechanical load on an induction motor increases? Barrow_forwardQ4/B/ What are the principal characteristics of a series DC motor? What are its uses? Core Mcarrow_forward
- Sketch the torque versus speed characteristic for a series-connected dc motor.arrow_forwardA 220 V shunt motor driving its normal load draws an armature current of 50 A from a 220 V dc source. The armature resistance of this motor including brushes is 0.25 ohms. How much armature current (minimum) Will this motor draw from a 200 V DC source when driving the same load with the field adjusted to maintain the same speed.arrow_forwarddiscuss how the dc motor is used in washing machinearrow_forward
- Explain in detail the braking of Induction Motorsarrow_forwardWhat is the relationship between slip s) and load (Pa) in an induction motor? Please explain.arrow_forwardWhat is the use of commutating poles in a DC machine? To stabilise the speed To increase the starting torque To increase the counter emf To eliminate sparking at brushesarrow_forward
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Single Phase Induction Motor, How it works ?; Author: Lesics;https://www.youtube.com/watch?v=awrUxv7B-a8;License: Standard Youtube License