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The primary function of any variable rate drive system would be to control torque, the rate, acceleration, deceleration and direction of a machine.
Many multipurpose machines can reap the benefits of this because their rates should be often altered to optimize the machine procedure or empower it to perform various other jobs which enables production rate, improved product quality and security.
Machine tools like milling machines and lathes may run work pieces at low speeds and high rates to optimize the feed speed of the cutting tool. For example; it empowers a printing press to be controlled at the speed that makes the highest quality merchandise, and may fluctuate extensively with coating and weight of the paper, and any features of the ink which is being used. Additionally using a variable speed drive system can the acceleration controlled which enables the press to hasten easily so preventing breakage of the web paper.
You can find still earlier or older kinds of variable speed drive in use now which are based upon mechanical and hydraulic rules; yet the most famous choice now for industrial uses is the electric variable speed drive. Hydraulic and mechanical systems only cannot offer the exact same advantages of versatility, high efficacy, low care, high performance and average initial cost, which the electric variable speed drive is capable of.