Several home appliances, usually kitchen appliances and various portable tools use a single-phase, universal type of motor whose operating principle is totally different from the induction motor. They are usually manufactured for powers up to 3/4 hp and for powers above a few hp, these motors do not work very well in alternating current, as a great friction in the brushes happens which results in a decrease in performance and power factor.
The designation given to the universal motor comes from the fact that it can operate both under alternating current and DC power enerpac ze3420mb. In fact it is a series direct current motor. It is a variable speed motor, with low speeds for large torque and high speeds for small loads. The stator of this type of motor is a set of protruding poles with coils wound on them and the rotor is composed of a winding distributed in grooves and connected in series with the coils of the stator (armature). The starting torque is high and for this reason they are often used in small appliances, such as electric drills and sanders, which require high torque, and in blenders, vacuum cleaners and centrifugal pumps, which require high speed.