The universal motor is the only single-phase electric motor whose stator coils are electrically connected to the rotor by means of two sliding contacts (brushes). These two contacts in turn connect the stator and the rotor in series.
It has some characteristics regarding speed, voltage frequency, power and application.
Like all series motors, the universal motor is also subject to an unloaded speed (vacuum) that is too high. This speed must be prevented from being reached, and for this purpose a set of gears is built into the casings to produce a strong torque against rotation. This torque prevents high idle speed and high engine torque at low speed. hose reels d83075 olp
The universal electric motor is designed to operate with voltage values ranging from 250 V (volt) to 1.5 V. The corresponding values of commercial frequencies range from 60 Hz to zero frequency. This corresponds to a direct current.
A higher power universal motor can be obtained if modifications are made to the motor design so that it performs well with DC and AC.