ABSTRACT
Single-phase induction motors are less efficient than three-phase induction motors, developed primarily for domestic and light-industrial applications where three-phase supplies are generally not available. With a three-phase induction motor, a single-phase induction motor requires a rotating magnetic field, to start and run in the desired direction. A variation in single-phase 'capacitor-start' induction motor is a starting torque that provides a large capacitance and a running torque which improves the rotating field. Also, the variation of the capacitor-start induction motor is the split-phase induction motor. The shaded-pole induction motor is a self-starting squirrel-cage motor that uses inefficient method of creating a rotating magnetic field through the use shaded pole. This term refers to a short-circuited turn of thick copper wire which is placed around a small auxiliary pole. Universal motors are motors that work on either AC or DC. These are machines that is used to separate excited rotor windings which requires commutators and brushes to supply current to their rotors.
