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D.C wound field motors are constructed with brushes and a commutator, which add to the maintenance, limit the speed and usually reduce the life expectancy of brushed D.C. motors. A.C. induction motors do not use brushes; they are very rugged and have long life expectancies. The final basic difference is speed control.
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Direct current or DC electric motors work for situations where speed needs to be controlled.DC motors have a stable and continuous current.They were the first and earliest motors used.They were found , however as not good at producing power for long lengths.Electric companies found using DC motors did not work efficiently to generate electricity because the power was lost as the electric was transmitted. Brush DC motors use rings that conduct the current and form the magnetic drive that powers motor.DC motors are often found in appliances around home.

Alternating current or AC electric motors are used differently based on what type of AC motor it is.Single phase AC motors are known as general purpose motor.They work well in many different situations.These motors work great for systems that are hard to start because they need a lot of power.Three phase , also called polyphase  AC motors are usually found in industrial settings.These motors also have high starting power built to transmit lower levels of overall power.It gets its name from the fact that it alternates power.
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