It has low speeds for large loads and high speeds for light loads. The starting torque is very high. Series motors are used for driving fans, electric drills, and other small appliances. Since the series ac motor has the same general characteristics as the series dc motor, a series motor has been designed that can operate both on ac and dc. It finds wide use in small electric appliances.
Universal motors operate at lower efficiency than either the ac or dc series motor.
They are built in small sizes only. Universal motors do not operate on polyphase ac power. Integrated Publishing's Official Web Page Click here for a current index of everything on this web site. All Rights Reserved.