Define salient-pole rotor construction - synchronous machine, Electrical Engineering

Assignment Help:

Define Salient-pole Rotor Construction - Synchronous Machines?

Salient-pole rotor construction on the other hand, may be used for low to medium speed applications. The machines of this kind are normally multi-pole and have a variable air- gap width. The prime mover is usually a direct- coupled water turbine (as in the Dinorwig pumped-storage scheme previously mentioned) with several 12-pole motor/generators.

635_Define Salient-pole Rotor Construction - Synchronous Machines.png

Figure: 2-pole (a) and 4-pole (b) salient rotors

The rotor diameter is large and its length is quite short whereas the axis of rotation is often vertical to suit the water turbine. However, whatever the rotor (and machine) type, it must be wound for the same number of poles as the stator. The rotor winding carries DC current to produce constant flux per pole. It is therefore the rotation of the rotor with respect to the stator that causes the induction of voltage in the stator windings. The 3-phase stator currents themselves produce another revolving field in a manner analogous to a conventional induction machine. This field rotates at the same speed as the rotor so that it is stationary with respect to the rotor field. It is the magnetic interaction between these two fields that results in the torque production of the machine.


Related Discussions:- Define salient-pole rotor construction - synchronous machine

Explain different routing plan adopted in a network, Q. Explain different R...

Q. Explain different Routing plan adopted in a Telephone network.  Ans: Hierarchical networks are capable of handling heavy traffic where required, and at the same time us

Multiplexers, how to design a 32:1 multiplexer using two 16:1 multiplexers ...

how to design a 32:1 multiplexer using two 16:1 multiplexers and a 2:1 multiplexer?

Force between current carrying conductors, If a second current carrying con...

If a second current carrying conductor is placed near to the first and the corresponding magnetic fields drawn, we can begin to visualise why a force is created between them. If

Poly phase induction motor, Using the approximate equivalent circuit in whi...

Using the approximate equivalent circuit in which the shunt branch is moved to the stator in put terminals, show that the rotor current, torque, and electro magnetic power of a pol

Why positive feedback is used in oscillator, Q. Why positive feedback is us...

Q. Why positive feedback is used in oscillator? The main application of positive feedback is in oscillators. An oscillator generates AC output signal without any input AC signa

Determine the forced component of the voltage, Q. Consider an RL series cir...

Q. Consider an RL series circuit excited by (a) v(t) = 20e -2t V, and (b) v(t) = 20 V. Determine the forced component of the voltage across the inductor for R = 2  and L = 2H.

Determine the maximum value of the voltage induced in coil, Q. A 10-turn sq...

Q. A 10-turn square coil of side 200 mm is mounted on a cylinder 200 mm in diameter. If the cylinder rotates at 1800 r/min in a uniform 1.2-T field, determine the maximum value of

#complex frequency.., i cant imagine of something called complex frequency....

i cant imagine of something called complex frequency...i find it important for laplace transformation,but i am lacking the physical explanation,please explain this to me

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd