10% off filters when purchased with a drive

Shipping & Returns

We understand that very often inverter drives are required quickly and hence, delivery is of the essence.

UK mainland deliveries: For items indicated as being available on next working day delivery, then orders received before 1:00 p.m. will usually be delivered by courier the next working day at no extra charge*.

Saturday deliveries can be organised at extra charge, please call our sales office.

Items not held on UK stock will be generally be delivered in 5 to 10 days, again free of charge*.

*Note a charge may be levied for some of the extended area postcodes of the UK mainland

Non UK mainland deliveries: Please contact +44 (0) 151 334 4555 for delivery price.

Returns: Please contact +44 (0) 151 334 4555 to arrange the return of a part. If the part is not used and in a resalable condition then we will refund the cost less a small restocking charge.

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VIPA - the art of automation

How does an inverter work?

An inverter when used in the context of motor speed control can also be known as a variable frequency drive (VFD). It essentially generates a varying frequency three phase AC voltage to effect a change in the speed of a motor. It achieves this by converting the incoming power supply into a DC voltage and then generating a three phase AC voltage from this DC supply. The development of electronics since the manufacture of the first semiconductors has seen the speed and processing power increase enormously which has made it possible to, not only digitally synthesise the required AC frequency for any given speed of the motor but to also analyse the motor current and rotor position.

Why is it called an inverter?

The term inverter only relates to the final part of the VFD's electronic architecture, the part that converts DC voltage to AC. There is no clear technical reason for the use of the term 'inverter' as it is generally believed to refer to the inversion of the early mechanical process of converting AC voltage to DC, sometimes referred to as an 'inverting converter'.

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