LEESON Electric Corporation  

Glossary of Terms

 
IEC (International Electrotechnical Commission):
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.
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