1. Induction
Class of motors that derives its name from the fact that current is induced into
the rotor windings without any physical connection with the stator windings (which
are directly connected to an AC power supply); adaptable to many different environments
and capable of providing considerable power as well as variable speed control. Typically
there is "slip," or loss of exact speed tracking with induction motors.
2. Synchronous
Class of motors that operate at constant speed up to full load. The rotor speed
is equal to the speed of the rotating magnetic field of the stator; there is no
slip. Reluctance and permanent magnet are the two major types of synchronous motors.
A synchronous motor is often used where the exact speed of a motor must be maintained.
3. AC Servo
AC servomotors are typically permanent magnet synchronous motors that can often
have low torque-to-inertia ratios for high acceleration ratings.
4. Universal
Class of motor that can operate at approximately the same speed and output on either
DC or single-phase AC power; also known as an AC/DC motor.
5. Others - Unlisted or specialized AC motor construction.
6. Multi-speed
Motor speed can be continuously adjusted or set at discrete speeds within the operating
range.
7. Reversible
Motor can be run in both clockwise and counterclockwise directions with approximately
the same operating characteristics