GC: n

CT: Gear motors are complete motive force systems consisting of an electric motor and a reduction gear train integrated into one easy-to-mount and -configure package. This greatly reduces the complexity and cost of designing and constructing power tools, machines and appliances calling for high torque at relatively low shaft speed or RPM. Gear motors allow the use of economical low-horsepower motors to provide great motive force at low speed such as in lifts, winches, medical tables, jacks and robotics. They can be large enough to lift a building or small enough to drive a tiny clock.

S: http://www.ehow.com/about_5313147_gear-motor.html (last access: 23 December 2014)

N: 1. gear (n): c.1200, “fighting equipment,” probably from Old Norse gervi “apparel,” related to gerr “ready,” and gerva “make ready,” from Proto-Germanic garwian- “to make, prepare, equip”. Meaning “toothed wheel in machinery” first attested 1520s.
motor (n): mid-15c., “controller, prime mover,” from Latin motor, literally “mover,” agent noun from past participle stem of movere “to move”. From 15c. as “controller, prime mover” (in reference to God); sense of “agent or force that produces mechanical motion” is first recorded 1660s; that of “machine that supplies motive power” is from 1856.
2. Most synchronous AC electric motors have output ranges of from 1,200 to 3,600 revolutions per minute. They also have both normal speed and stall-speed torque specifications. The reduction gear trains used in gear motors are designed to reduce the output speed while increasing the torque. The increase in torque is inversely proportional to the reduction in speed. Reduction gearing allows small electric motors to move large driven loads, although more slowly than larger electric motors. Reduction gears consist of a small gear driving a larger gear. There may be several sets of these reduction gear sets in a reduction gear box.

S: 1. OED – http://www.etymonline.com/index.php?allowed_in_frame=0&search=gear&searchmode=none; http://www.etymonline.com/index.php?allowed_in_frame=0&search=motor&searchmode=none (last access: 23 December 2014). 2. http://www.ehow.com/about_5313147_gear-motor.html (last access: 23 December 2014).

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CR: energy