Electric Power Tools
Description
VFD manufacturers’ installation recommendations aside, how much voltage can a motor’s winding insulation really tolerate? The winding insulation system on existing general purpose motors may generally withstand pulses of 1000 V, which is totally inadequate for IGBT drives on 480 V systems. If the ac input voltage to the VFD is 240 V or less, the dc bus voltage is kept low and the magnitude of these “reflected waves” generally is not an issue.
Single phase to three phase VFDs are used to replace three phase service when only single phase is available. But VFDs can do lots more than just get you three-phase. There are cases where you will need three phase input to a VFD but these are super advanced and I will not get into these here.
The only problem is the small VFDs are only rated for about 3 HP, but check the amp draw on the motor, you might be able to squeak by on the amp rating, and it would also give you a lot more speed control. You might want to look at the insulation rating on the motor. Also, with heavy use, it needs to be an F rated insulation on the windings. The rating will be on the data plate.
Variable frequency drive (VFD) systems make use of a motor, operator interface and drive controller assembly. Motors used in VFD systems are normally three-phase induction styles. Single phase motors or synchronous may be used.
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1HP VFD...
VFDS LLC
2HP VFD, 5HP VFD, variable frequency drive, 7.5HP VFD
Address: 8235 W. Sunset Boulevard,
Los angeles, California
United States, 90001
Tel: +1-310-6421125
Fax: +1-310-6421375
