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In underground mining a hoist or winder[1] is used to raise and lower conveyances within the mine shaft. Modern hoists are normally powered using electric motors, historically with direct current drives utilizing Ward Leonard control machines and later solid-state converters (thyristors), however modern large hoists use alternating current drives that are variable frequency controlled.[1] There are three principal types of hoists used in mining applications:

process of manufacturing or inventing something is known as Mechanical Fabrication

A Generator is a device which converts mechanical energy into electrical energy. WORKING PRINCIPLE. A.C Generator works on the principle of electromagnetic induction (motional emf). In generator an induced emf is produced by rotating a coil in a magnetic field.