An electric drive is an
electromechanical device where electrical energy is converted into mechanical
energy which imparts motion to different machine parts to achieve fine process
control. The common applications of electric drives are in driving fans,
ventilators, pumps, lifting devices, compressors, conveyor belts, excavators,
escalators etc. Manual, semiautomatic and automatic controllers can be employed
for the operation of electric drives. There are three types of electric drives.
They are group electric drive, individual electric drive and mult-motor
electric drive. A single motor that drives one or more line shafts which are
supported on bearings is used in group electric drive. This drive is also known
as shaft drive where line shafts are fitted with pulleys, belts and gears. In
individual electric drive, each individual machine is driven by a separate
motor. Single spindle drilling machines and lathes are examples. Multi-motor
electric drives carry several drives, each of which serves to actuate one of
the working parts of the driven mechanism. This type of drive is used in
cranes, rolling machines, metal cutting machine tools and paper making
machines.
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