Electrical Engineering ⇒ Topic : Universal motors
Like all series motors, the no-load speed of the universal motor is universally high. Quite frequently, gears trains are built into the motor housing of some universal motors to provide exceedingly high torque at low speeds.
When these motors are used in commercial appliances such as electric shavers, sewing machines, office machines, and small hand hair diyers or vacuum cleaners, they are always directly loaded with little danger of motor run away
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