LEESON Electric Corporation  

Glossary of Terms

Duty Cycle:
The relationship between the operating time and the resting time of an electric motor. Motor ratings according to duty are:
  • Continuous duty, the operation of loads for over one hour.
  • Intermittent duty, the operation during alternate periods of load and rest.
Intermittent duty is usually expressed as 5 minutes, 30 minutes or one hour.
A ratio of the input power compared to the output, usually expressed as a percentage.
The term used to describe the motor housing. The most common industrial types are: Open Drip Proof (ODP), Totally Enclosed Fan Cooled (TEFC), Totally Enclosed Non-Ventilated (TENV), Totally
Enclosed Air Over (TEAO). (See Chapter IV for additional information).
The part of a motor that houses the bearing supporting the rotor and acts as a protective guard to the internal parts of the motor; sometimes called endbell, endplate or end bracket.
The act of creating magnetic lines of force from a motor winding by applying voltage.
Explosion-Proof Motors:
These motors meet Underwriters Laboratories and Canadian Standards Association standards for use in hazardous (explosive) locations, as indicated by the UL label affixed to the motor. Locations are considered hazardous because the atmosphere does or may contain gas, vapor, or dust in explosive quantities.
General Info
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