Product Manual

Reactance: The opposition to a flow of current other than pure
resistance. Inductive reactance is the opposition to change of current
in an inductance (coil of wire). Capacitive reactance is the opposition to
change of voltage in a capacitor.
Rectifier: A device or circuit for changing alternating current (AC) to
direct current (DC).
Regenerative Drive: A drive that allows a motor to provide both
motoring and braking torque. Most common with DC drives.
Relay: A device having two separate circuits, it is constructed so that a
small current in one of the circuits controls a large current in the other
circuit. A motor starting relay opens or closes the starting circuit under
predetermined electrical conditions in the main circuit (run winding).
Reluctance: The characteristics of a magnetic field which resist the flow
of magnetic lines of force through it.
Resistor: A device that resists the flow of electrical current for the
purpose of operation, protection or control. There are two types of
resistors - fixed and variable. A fixed resistor has a fixed value of ohms
while a variable resistor is adjustable.
Rotation: The direction in which a shaft turns is either clockwise (CW) or
counter clockwise (CCW). When specifying rotation, also state if viewed
from the shaft or opposite shaft end of motor.
Rotor: The rotating component of an induction AC motor. It is
typically constructed of a laminated, cylindrical iron core with slots for
cast-aluminum conductors. Short-circuiting end rings complete the
“squirrel cage,” which rotates when the moving magnetic field induces
a current in the shorted conductors.
SCR Drive: Named after the silicon controlled rectifiers that are at
the heart of these controls, an SCR drive is the most common type of
general-purpose drive for direct current motors.
Self-Locking: The inability of a gear reducer to be driven backwards by
its load. Most general purpose reducers are not self-locking.
Service Factor for Gearing: A method of adjusting a reducer’s load
carrying characteristics to reflect the application’s load characteristics.
AGMA (American Gear Manufacturers Association) has established
standardized service factor information.
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