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two main reasons for maintaining the speed of machinery by using variable speed drives are to control the process and to conserve energy. though these drives are manufactured for process control, energy conservation has become its prime objective.
many industrial processes need different speed to run different products. we can save energy by controlling the speed of these processes. since we can select the speed from the pre-set ranges, it is called the "adjustable" speed. this is also referred as variable speed because its zhongyiyepk output can be changed without undergoing any steps. these are purely mechanical variations.
some advantages of using vsd are, they give smoother operation and acceleration control and allow you to choose different speed for each process, slow down operation for setup purposes, adjust rate of production, control torque, and compensate variables in changing process.
mechanical drives: there are two types of mechanical drives. they are variable pitch drives and traction pitch drives. variable pitch drives consist of pulley and belt in which the diameter of the pulleys is adjusted. traction drives are those where power is transmitted through metal rollers. the speed ratio is adjusted by the movement of rollers and its diameter of the contact path.
hydraulic drives: there are three types of hydraulic drives. one is hydrostatic drive that consists of hydraulic motor and a pump. the revolution of the motor is related to a set of volume of fluid which is resolute the displacement despite its speed. the speed is controlled by setting a valve. in hydrodynamic drives, fluid couples are used to regulate speed and the hydroviscous drive speed is controlled by one or more discs connected to the input shaft.
electrical drives: there are three types of electrical drives. they are dc motor drives, eddy current drives and ac motor drives.
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