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!
Q. emf produced by windings?
The time variation of emf for a single conductor corresponds to the spatial variation of air-gap flux density. By suitable winding design, the harmonics can be reduced appreciably, and the waveform of the generated emf can be made to approach a pure sine shape.
Figure shows an elementary single-phase, two-pole synchronous machine. In almost all cases, the armature winding of a synchronous machine is on the stator and the field winding is on the rotor, because it is constructionally advantageous to have the low-power field winding on the rotating member. The field winding is excited by direct current, which is supplied by a dc source connected to carbon brushes bearing on slip rings (or collector rings). The armature windings, though distributed in the slots around the inner periphery of the stator in an actual machine, are shown in Figure (a) for simplicity as consisting of a single coil of N turns, indicated in cross section by the two sides a and -a placed in diametrically opposite narrow slots. The conductors forming these coil sides are placed inslots parallel to the machine shaft and connected in series by means of the end connections.
The coil in Figure (a) spans 180° (or a complete pole pitch, which is the peripheral distance from the centerline of a north pole to the centerline of an adjacent south pole) and is hence known as a full-pitch coil. For simplicity and convenience, Figure (a) shows only a two-pole synchronous machine with salient-pole construction; the flux paths are shown by dashed lines. Figure (b) illustrates a nonsalient-pole or cylindrical-rotor construction. The stator winding details are not shown and the flux paths are indicated by dashed lines.
What are ultrasonic sensors made of? What is a good online source to find information on a basic level about ultrasonic sensors?
Consider a 3-hp, 220-V, 1800-r/min separately excited dcmotor controlled by a single-phase fully controlled rectifierwith an ac source voltage of 230Vat 60Hz.Assume that the full-l
Calculate the approximate donor binding energy Calculate the approximate donor binding energy for Si (r = 11.7,m x n = 1.18 m 0 ) Solution: From E= m * n q 4 / 2(4 πε 0
Q. Parallel - flash converter? Parallel / flash converter. Also known as parallel A/D converter, this circuit is the simplest to understand. It's formed of a series of co
Switching Characteristics During Turn off The techniques used for turning off a thyristor is known as commutation techniques. A thyristor can be can be turn off by reducin
Explain and drive the expression for fixed bias and potential divider.
What is memory mapping? The assignment of memory addresses to several registers in a memory chip is known as memory mapping.
What are the signals involved in memory bank selection in 8086 microprocessor? The 8086 based system will have two sets of memory IC's. One set for even bank and another for od
Q. Show the Storage Layout of digital system? The IEEE floating point numbers have three basic components: the sign, the exponent, and the mantissa. A mantissa is composed of t
Determine the signal bandwidth and the amplitudes, Computer Networking
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