Induction Motor

An induction or a synchronous motor is a type of AC motor where power is supplied to the rotor by means of electromagnetic induction, rather than a commutator or slip rings as in other types of motor. These motors are widely used in industrial drives, particularly poly-phase induction motors, because they are rugged and have no brushes. Single-phase versions are used in small appliances. Their speed is determined by the frequency of the supply current, so they are most widely used in constant-speed applications, although variable speed versions, using variable frequency drives are becoming more common. The most common type is the squirrel cage motor

TYPES OF DC MOTORS

                Stepper Motor

                Brushed DC Motor

                Brushless DC Motor (BLDC)

                Permanent Magnet Synchronous Motor

Stepper Motor:

              A stepper motor (or step motor) is a brushless DC electric motor that divides a full rotation into a number of equal steps.

              The motor's position can then be commanded to move and hold at one of these steps without any feedback sensor (an open-loop controller), as long as the motor is carefully sized to the application.

             Switched reluctance motors are very large stepping motors with a reduced pole count, and generally are closed-loop commutated.