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What's the difference between variable-speed drives and variable-frequency drives?

If you’re in the market for variable-speed drives, you’ll have noticed that they’re sometimes referred to as variable-frequency drives. So what’s the difference?

Variable-speed drives (VSDs) relate to both AC and DC drives, and a VSD connected to a DC electric motor will vary the speed and torque of the motor by controlling the voltage and current. Variable-frequency drives (VFDs) refer to AC drives only and control voltage and input frequency.

So there you have it. But just to make matters more confusing, drives are often referred to as ‘adjustable-speed drives’, ‘adjustable-frequency drives’, ‘AC drives’, ‘inverter drives’ or just plain ‘inverters’.

Whatever you call them, variable-speed drives are a great choice for increasing productivity, improving energy efficiency and cutting costs in a huge number of applications. As an Authorised Value Provider of ABB drives, there isn’t much our team of expert engineers don’t know about these indispensable devices, so give us a call on 01621 868138 or email info@gibbonsgroup.co.uk with any questions you may have.

Variable-Speed Drives

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