Explain about direct-current machines, Electrical Engineering

Assignment Help:

Q. Explain about Direct-current machines?

Generally speaking, conventional dc generators are becoming obsolete and increasingly often are being replaced by solid-state rectifiers in most applications for which an ac supply is available. The same is not true for dc motors. The torque-speed characteristics of dc motors are what makes them extremely valuable in many industrial applications. The significant features of the dc drives include adjustable motor speed over wide ranges, constant mechanical power output or torque, rapid acceleration or deceleration, and responsiveness to feedback signals.

The dc commutator machines are built in a wide range of sizes, from small control devices with a 1-W power rating up to the enormous motors of 10,000 hp or more used in rolling-mill applications. The dcmachines today are principally applied as industrial drivemotors, particularly when high degrees of flexibility in controlling speed and torque are required. Such motors are used in steel and aluminumrollingmills, tractionmotors, overhead cranes, forklift trucks, electric trains, and golf carts.Commutatormachines are also used in portable tools supplied frombatteries, in automobiles as starter motors, in blower motors, and in control applications as actuators and speed-sensing or position-sensing devices.


Related Discussions:- Explain about direct-current machines

Banking system , banking system is the collection of financial entities, in...

banking system is the collection of financial entities, infrastructure and practices which support financial transactions . system tech is a software system to handle their transa

Combination of uni-selectors and two motion selectors, Q Using a combinatio...

Q Using a combination of Uni-selectors and two motion selectors, draw a diagram of thousand line exchange and illustrate its working. Ans: The diagram for such an exchange i

Electric discharge machining process, Describe the following in Electric di...

Describe the following in Electric discharge Machining Process(EDM). a) Dielectric fluids & their characteristic b) Electrodo feed Control c) Flushing System

Public and extrn assembler directive, What do you understand by PUBLIC ...

What do you understand by PUBLIC assembler directive?   The PUBLIC and EXTRN directives are very significant to modular programming. PUBLIC used to state that labels of

Obtain the value of rs, Consider and obtain the values for R S , R 2 , R 1 ...

Consider and obtain the values for R S , R 2 , R 1 , and R D . Apply the rule-of-thumb dc design procedure outlined in this section for a JFET with V P = 3V, I DSS = 20 mA, and a

Discuss all the five software interrupt instructions, Discuss all the five ...

Discuss all the five software interrupt instructions. The INTEL family microprocessor consist of software interrupts INT, INT0, INT3 and BOUND and IRET. Out of all these five

Dc machince, what ''s part of dcmotor or dc generator

what ''s part of dcmotor or dc generator

Use of computers in power systems, Q. Use of Computers in Power Systems? ...

Q. Use of Computers in Power Systems? The control and stability of any electric power system is indeed extremely important, in particular when a system is expected to maintain

Show how emitter amplifier work as a buffer amplifier, Q. Due to what speci...

Q. Due to what special property does an emitter amplifier work as a buffer amplifier?  The circuit design of the emitter follower is such that it has a high input impedance and

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