350 Electrical Power Systems Technology
Motor Reversal
Dynamotor
Brushless DC Motor
DC Stepping Motor
Single-Phase Alternating Current (AC) Motors
Universal Motors
Split-Phase Induction Motors
Capacitor Motors
Shaded Pole Motor
Repulsion Motors
Synchronous Motors
Synchronous Speed
Slip
Rotor Frequency
Three-Phase AC Motors
Three-Phase AC Induction Motor
Three-Phase AC Synchronous Motor
Three-Phase Wound-Rotor Induction Motor
Damper Windings
Auxiliary Starting Machine
Synchro System
Servo System
Efficiency
BASIC MOTOR PRINCIPLES
The function of a motor is to convert electrical energy into mechani-
cal energy in the form of a rotary motion. To produce a rotary motion, a
motor must have an electrical power input. Generator action is brought
about by a magnetic field, a set of conductors within the magnetic field,
and relative motion between the two. Motion is similarly produced in a
motor through the interaction of a magnetic field and a set of conductors.
All motors, regardless of whether they operate from an AC or a DC
power line, have several basic characteristics in common. Their basic parts
include (1) a stator, which is the frame and other stationary components,
(2) a rotor, which is the rotating shaft and its associated parts, and (3) aux-
iliary equipment, such as a brush/commutator assembly for DC motors,
or a starting circuit for single-phase AC motors. The basic parts of a DC