The worldwide
organization that promotes international unification of standards or norms.
Its formal decisions on technical matters express, as nearly as possible, an
international consensus.
IGBT:
Stands for isolated gate bipolar transistor. The most common and
fastest-acting semiconductor switch used in pulse width modulated (PWM)
AC drives.
Impedance:
The total opposition in an electric circuit to the flow of an
alternating current. Expressed in ohms.
Induction Motor:
The simplest and most rugged electric motor, it
consists of a wound stator and a rotor assembly. The AC induction motor
is named because the electric current flowing in its secondary member (the
rotor) is induced by the alternating current flowing in its primary member
(the stator). The power supply is connected only to the stator. The
combined electromagnetic effects of the two currents produce the force to
create rotation.
Insulation:
In motors, classified by maximum allowable operating temperature.
NEMA classifications include: Class A = 105°C, Class B = 130°C,
Class F = 155°C and Class H = 180°C.
Input Horsepower:
The power applied to the input shaft of a gear
reducer. The input horsepower rating of a reducer is the maximum horsepower
the reducer can safely handle.
Integral Horsepower Motor:
A motor rated one horsepower or larger
at 1800 RPM. By NEMA definitions, this is any motor having a three digit
frame number, for example, 143T.
Inverter:
An electronic device that changes direct current to alternating
current; in common usage, an AC drive.
