Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
The Three-phase alternator
In this case, three separate sets of coils are wound on the stator and connected to produce three separate outputs. Because of the physical displacement of the coils around the stator, the outputs will have different phases with respect to each other. Three-phase systems are common even when DC outputs are required (e.g. electric alternators to charge a car battery) because of the torque reaction problem mentioned above. The AC output is rectified with a set of six diodes mounted in a single pack (two diodes are needed to rectify each phase).
A two-pole, three-phase alternator is shown in the diagram below. Stator coils AB belong to phase 1, coils CD to phase 2 and coils EF to phase 3. Each pair of coils are connected in series and their outputs add (e.g. A and B are connected in series to produce phase 1 output). Notice it is two-pole because there are only two poles (i.e. one pole pair) on the rotor. The frequency of each phase output is therefore equal to the rotational speed of the rotor.
Unlike the single-phase alternator, it turns out that the torque required to drive a three-phase alternator is constant, with no pulsating component. This is an important advantage.The figure below shows the arrangement for a multipole three-phase alternator. Again, coils A&B, C&D and E&F are connected in series to three differnet outputs, each with a phase shift of 120° apart (because of the physical arrangement of the coils on the stator).
Q. In an AM transmitter that transmits a total power of 1 kW, the unmodulated carrier power is 850 W. Compute the required value of (S i /N i )AM at a receiver, if (S 0 /N 0 )AM
Q. What is error-rate control? A system is said to possess error-rate damping when the generation of the output in some way depends upon the rate of change of the actuating sig
What are the application specific instruction processors? Single purpose processor or ASIP (Application Specific Instruction processor) a. Floating point Coprocessor and Gra
hi can you help with newton raphson?
I need help with some circuits.
Q. If it is desired to store English-language writing with 1 byte representing each letter, find the minimum number of bits per byte that could be used. Ans. For the 26 le
left child right sibling datd
1. (a) Consider a sinusoidal signal m(t) = A cos(2 Π f m t) applied to a delta modulator with step size . Determine the range of the step size so that slope overload will be avoide
hi there, i have to write a program for seven segments counter with three buttons to make it counting up and down from 00 to 99 so i''m looking for someone can write it..........th
Two byte Instructions In these instruction the first byte specifies the operations code and the second byte specifies the operand. To identify two byte instructions o
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd