What does a variable speed drive do?

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A variable speed drive is a device used in electromechanical drives to control the speed and torque of an AC motor by adjusting the motor’s input frequency and voltage. Variable speed drives may be either electric, hydraulic, mechanical or even electronic. They control the speed at which a motor operates in a precise and constant manner. Otherwise, the machines that use these mechanisms and motors would work as per their own characteristics and power supply, which would be highly ineffective.

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