LEESON Electric Corporation  

Glossary of Terms

 
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.
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