I thought brushes were only for DC motors?
These are used in electric power tools, vacuum cleaners and hair dryers mostly. They are called universal motors, so named because they are AC/DC. These commutator motors go to a higher speed (for fans), and are more readily speed controlled where variable speed is needed. They are often series wound. The armature and the field are in series, so they go to a high speed with no load. Some AC motors of the past had a commutator start arrangement, particularly with refrigeration compressors. AC motors are becoming more capable of speed control with inverter style controllers. Generally they are limited to the AC supply frequency, for example a 2 pole motor (the fastest) can only go to 3000/3600rpm approx. for 50/60Hz.
Universal Motor Like series Motor gor Commutator Brushs ,which is uesed in Kitchen Machines, Mixies,Hair dryers,Vacuum Cleanerws Hand Blowers Etc.with High speed Motor.
