If you’re in the market for variable-speed
drives, you’ll have noticed that they’re also sometimes referred to as
variable-frequency drives or inverters. 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.
Inverter can be a
confusing term as it’s also a shortened version of power inverter, which means
a device that converts a supply voltage from DC to AC (such as a phone charger
connected to a car’s battery). However, in the case of electric motor speed
control, an inverter refers to a VSD or VFD.
Just to further confuse matters, drives are often referred
to as ‘adjustable-speed drives’, ‘adjustable-frequency drives’, ‘AC drives’ or
‘inverter drives’. But 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 Paul Scott a call on 01621 868138 or email paul@gibbonsgroup.co.uk with any
questions you may have.
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