why we use dc motor instead of ac motor?

Answer Posted / john davidson

With the advancement of AC drive technology AC motors can
do just about anything a DC motor can do. They can develop
full torque at zero RPM, once the holy grail of DC,have a
wider speed range, and amost zero maintenance requirments.
And to top all that from an intial cost stand point AC
motor/drive combinations are much cheaper. As for
industrail application, in the vast majority AC is the
prefered mehtod.

Is This Answer Correct ?    5 Yes 0 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

Can anyone explain me about the capacitor calculation

1707


Does all the output contacts (N/O as well as N/C) of a Numerical relay operate when relay receives a binary input/inputs or contacts are designated to specific logic input/inputs and only these contacts operate?

1617


what is the difference between switchgear and circuit breakers and is there any difference between outdoor and indoor switchgear and circuit breakers , and how would you differentiate between switch yard and substation and grid station . thanks

1744


why 3 phase is converted into 2 phase using electronics circuit why not 2 phases are diresctly putted from the 3 phase transformer??

1682


what is two point starter?

1639






What do you mean by a voltage transformer?

682


Why phase sequence must be same in any ht motor or generator circuit?if phase sequence doesn't same whatever will be affect on circuit?

1722


what is mean by descripiency relay? & wht is its ansi code?

2618


when we have to use UPF wattmeter and LPF wattmeter? what is the difference between UPF and LPF wattmeter in terms of construction?

1925


What are the two segments of nyquist contour.

651


What types of question are done for diploma students in aptitude test

1081


what is the criteria for selection of conductor used for ehv ac electrical dischrge

1607


What is the formula to calculate the rating of a three phase air circuit breaker

1817


Mention the disadvantages of low power factor?

684


Which motor is 3.3 or 11kV more reliable, in terms of efficeancy,maintenance, reliability.

1610