DC motor VS AC motor?

Question

Please tell advantages & disadvantages of both?

Answer 1

In the past, DC motors were used in heavy duty operations that required precise motion control over a range of speeds. Examples are Diesel Locomotives, motors for Aerial Gondolas at ski lifts and building elevators. AC motors are better suited to constant speed continuos operation applications.

However digital control enables small dc motors to have very precise speed control via feedback. And newer AC motors have better torque characteristics to allow startup under load for applications that are not continuous running.

Answer 2

AC vs. DC

The main difference between AC motors and DC motors can be found in the name itself for, DC motors run on direct current as opposed to alternating current on which AC motors run.

With direct current, energy is obtained from batteries or cells and generates a constant voltage. This constant voltage then stimulates the steady flow of electrons in one direction. It is this constant and precise flow of energy that makes direct current most suitable for applications that require precise and stable operation, such as speed and torque control applications.

With alternating current, energy is obtained through both AC generators and mains to generate a varying voltage. It is because of this varying voltage that the electrons of an alternating current, unlike those of a direct current, continuously change direction, moving forward and backward. Also in contrast to direct current, which is unable to produce voltage capable of traveling over long distances, the voltage of alternating current is safe to transfer over long distance and provide greater power, making alternating current ideal for both home and industrial applications.

While, at first glance the difference between alternating current motors and direct current motors may appear trivial, upon further inspection, you are able to see how these seeming small differences have an enormous impact on the efficiency of your application. When choosing between AC motor and DC motors, you must thus consider where your power is generated from as well the level of precision needed for the application to operate effectively. By discussing these factors with a skilled engineer, you can rest assured that you will receive the best motor for your application.

AC power has become popular and advantageous because of easy generation, transmission with less losses to long distances due to stepping up voltage and stepping down the voltage to a desired level. In Industries 70% of the motors and drives used are Induction motors, hence ac motors in general means induction motors. Induction motors were preferred in industries due to the advantages of its rugged construction, less maintenance and can be operated in explosive atmospheres also. Therefore Induction motors ruled out all the motors in industries in every application. But DC motors were still used in certain applications where induction motors cannot fulfill the need. so, dc motors have its own significance in industries. This is because some special characteristics they possess.

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https://www.electrikals.com/

Answer 3

dc works well with batteries.
ac can be plugged in the wall.
dc is more portable (batts)
ac doesnt run your batts dead.
MIKE