VSD Basics: How AC Motors & Variable Speed Drives Work

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This document provides an overview of variable speed drives (VSDs), including how they work to vary the speed of AC motors, their applications, and information needed to size a VSD to a motor. VSDs work by rectifying AC input to DC, then switching the DC using IGBTs to produce a simulated AC waveform at varying frequencies to change motor speed. Common VSD applications include water pumps, fans, conveyors and lifts. Sizing a VSD requires motor data like kW rating, voltage, current and RPM from the motor nameplate.

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Inverter Training Level 1 Variable Speed Drives The Very Basics………

What is a Variable Speed Drive (VSD)? ,[object Object],In its most basic form a VSD is a device used to alter the speed of a standard 3 phase AC motor. Before the introduction of the VSD voltage to AC motors was switched directly from the supply (Direct on Line), this would allow the motor to run only at a fixed speed, 50Hz for example. This is fine, however in an application that required a variation in speed while maintaining torque other methods were required to change the pace of the motor. AC motor with Gearbox. DC motor with DC speed control. These methods are still used but can be expensive and require ongoing maintenance.

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