Variable Speed Drive

A VSD is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque.

There are many and diverse reasons for using variable speed drives. Some applications, such as paper making machines, cannot run without them while others, such as centrifugal pumps, can benefit from energy savings.

The benefits of energy savings are not always fully appreciated by many users. These savings are particularly apparent with centrifugal pumps and fans, where load torque increases as the square of the speed and power consumption as the cube of the speed

In general, variable speed drives are used to:

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