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What is an universal motor?
February 07, 2015 5:23PM
A universal type motor has carbon brushes to supply the voltage source to the armature. The universal refers to the ability of the motor to operate on both AC and DC voltages. A good example of use of a universal motor is on hand tools. Drills, grinders, are two examples. You can tell the type of motor by the two brush holders on the back end of the motor. These are usually black and have a screw cap. Removing this cap will expose the carbon brushes. Welders like the fact that they can operate their hand tools from the outlet on their welding machines that has a DC voltage output.