Variable speed for grinding motor

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Phatz75

Joined
Aug 6, 2015
Messages
7
Hello,

I need some input on what to buy for a variable speed control for my homemade belt grinder. Im posting a pic of the nameplate of the motor im using. Any suggestionsof where and what to buy for a variable speed for this motor would be greatly appreciated.

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Thank you
Mark
 
To many amps to do the ceiling fan trick... that motor should run the crap out of a belt ! You got to find a speed con. that can handle the amps and why aren't you running 220 v...it would be cheaper to run.


2 Panther
 
Phatz75, to vary the speed of an AC motor, you have to vary the frequency, not the volts or amperage. BTW, I forgot to mention I'm an industrial electrician. Don't want you to think I'm some jackleg bullsh*tter. Some AC motors are made to change speeds, like ceiling fan motors. This is because they are factory built that way. I'll spare you the useless details about how they do that. You have a single phase AC induction motor which requires a device called a Variable Frequency Drive (VFD) to make it run anything less than 3450 RPM's. Just google search for a VFD for a single phase motor. That motor is dual tapped to run 115 or 230 Volts. Just follow the wiring diagram on the motor.
 
Ive read that itwas impossible to used a VFD on a single phase motor. They suggesteda VFD with a 3 phase motor. Is this still true? It was info from 6 years ago.
 
Is your motor TEFC? For grinding metal it should be. Also, you can run a multiple pulley system or get a 3 ph motor for AC VFD. Others have reported other methods but these are the best. The knifemakers forum has a lot of threads on this subject.
 
You definitely want a 3 ph. mtr. If this is for a long term plan/project, start with pro grade gear.

here's the rig I put together

KBDA-27D 2HP NEMA 4X VFD 115/230VAC 1PH INPUT
st_KBDA-2_1.jpg


paired with this motor.
2HP LEESON 1725RPM 56H TEFC 3PH MOTOR

st_2308.jpg


finished rig.

DSC_0004.JPG


The VFD takes either 115 or 230. hooking it up in 230 mode gives better efficiency & gives the option to drive higher amp mtrs.
 
There are a few vendors out there who supply a VFD for a single phase motor. I'll post one when I find it.
 
bengler said:
There are a few vendors out there who supply a VFD for a single phase motor. I'll post one when I find it.
Click to expand...

Interesting. The drive seems to be a little more expensive than the KBDA - 27. How does the system work under load?
 
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