Capacitor Start/Run Motors: Good? Bad? OK?

P.Brewster

P.Brewster

Joined
Jul 25, 2007
Messages
1,380
I'm shopping for a motor for my new-born KMG clone.

I'm going to do 3-speed, so I need a 1.5 HP single-phase, 120 or 220 V, 17XX rpm.

I see a lot of capacitor start and/or run motors. Whats the deal with these? Should they be avoided? I don't have a problem with the wiring, but I've noticed that most of the capacitor motors are the cheap ones.

thanks
 
I am using a 1.5hp capaciter start 1750rpm tefc motor that cost me locally $130. I am using a 3 step pulley and its working fine. I dont beleive they are anything to avoid.
PS I would do a 2hp if I were building another KMG clone.
Chris
 
We use these type motors in our machines that produce gutter. Never had a problem, every once in a while, when some one uses a extension cord that is too long and too small a gauge the capacitor will burn out. But if wired properly. I see no problem at all.
Jim
 
I saw this thread, so I thought I'd ask a question, that may have an answer to help with your question:

Can you use old washer/dryer motors to make these things? I've seen a fair amount of free ones on craigslist, that claim to be working.
 
go mike
Depends on its speed, Spindle size, and hp.
What I would tell most is getting a good or great grinder with a weak motor is better than a weak grinder that can not be improved after you sell a few knives.
Chris
 
Well, I plan to upgrade to VFD by the end of the summer. So I'm looking for an El Cheapo as a temporary motor.
 
Capacitor start improves the start-up conditions of the motor; gives high torque with smaller starting current. So this type of motor is ideal for a grinder.
 
T. Hendrickson said:
Capacitor start improves the start-up conditions of the motor; gives high torque with smaller starting current. So this type of motor is ideal for a grinder.
Click to expand...

what he said. Most single phase industrial motors are capacitor start. The capacitor stores energy for starting,which is when a motor needs the most current

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