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Machine Shop and Tool Talk Shop Equipment, fabrication, repairs, how to fix it, which tool to use for the job. Machinist shop talk, straight to the point.

Machine Shop and Tool Talk

1 Horsepower VFD Quandary

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Old 03-15-2018, 10:39:51 PM
Pete Spaco Pete Spaco is offline
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Default Re: 1 Horsepower VFD Quandary

Well, in my case, it's torque that turns my drill bit, it just takes longer than if I had more horsepower. Good point about the possible need for an external motor cooling fan.

I have heard that the peak pulse voltage of the VFD may be hard on older motors that don't have the insulation the newer motors do. I won't be totally surprised if something happens to this one. But, as many of you know, used 3 phase motors are about one dollar per horsepower, since many are replaced on a fixed time in service rotation.

We will see.

Pete Stanaitis
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