Base Speed

Base speed is the manufacturer’s nameplate
rating where the motor will develop rated HP at
rated load and voltage. With DC drives, it is
commonly the point where full armature voltage
is applied with full rated field excitation. With
AC systems, it is commonly the point where 60
Hz is applied to the induction motor.

Bandwidth

Generally, frequency range of system input over
which the system will respond satisfactorily to a
command.

Back of a Motor

The back of a motor is the end which carries the
coupling or driving pulley (NEMA). This is
sometimes called the drive end (D.E.) or pulley
end (P.E.).

Axis

A principle direction along which movement of
the tool or workpiece occurs. The term axis also
refers to one of the reference lines of a
coordinate system.

Automatic Protection Circuit

A device which automatically (no human action
needed) disconnects power. For an example, a
circuit breaker is both a manual and automatic
device. A person can manually open a circuit
breaker or it can automatically open if it senses
an overcurrent condition.