smith compresso runs on start when switched over to run stalls

1 ANSWERS

1. amomipais82
   

   Hi There,
   A lot of it has to do with supply and demand. The motors that are advertised "not for compressor duty' are usually cheaply built and won't withstand even normal starting duty.
   
   The trick to starts per hour is mainly in the rotor design.
   
   Amps can be tricky to, because you have to dial efficiency into the equation.
   
   So if motor A uses 8 amps FLA, and motor B uses 9 FLA, not necessarily a better motor, maybe a less efficient motor.
   
   It is a long drawn out story with motors. They come from every country in the world, the differences between brands, especially when you take one apart is amazing.
   
   But they are still rated at 2 HP or whatever HP.
   
   Open motors are not that popular with the single user, building a saw, or lathe or something.
   
   Open motors are bought by OEMs building 10,000 pitching machines.
   
   I don't know Grizzly, but like in the bearing market and other markets, there is a "GRAY" market.
   
   In the "GRAY" market, the products ARE what they say they are usually, but they are bought surplus/salvage.
   
   Somebody finds a UPS truck full of 3HP Dayton motors and sells them till they are gone.
   
   Or somebody cancels an order of open motors, they don't sell, go broke whatever, then the market has someone selling them.
   
   I didn't study the Grizzly site, but I wonder if they are a contracted dealer for anyone.
   
   It's a confusing mess and at least you have the good sense to ask questions.
   
   I rep one brand. Not two or three or four. Actually I rep two, but the other is ABB and if you want a 5000HP 4160 Volt I can get it for you.
   
   But the guys who rep three or four lines, cherry pick the pricing. Brand A TEFC is 100, open is 80  then Brand B is 102 Tefc and open is 65.
   
   So take brand A Tefc and compare to Brand B open.......big difference in price same HP.
   
   Probably more than you wanted to know.
   
   But a 2HP on a dyno should produce 2HP at rated voltage at rated current, open, Tefc, Tenv, there is a dozen classifications.
   
   When you get in the higher HP above say 25, then you have to worry with design type. Design B, standard duty, design D, sever starting, so on.
   
   For what you are doing, and it has a warranty, get the least expensive motor that will fit.
   
   NO SLEEVE BEARING MOTORS, there are some but I didn't see any on Grisly.
   
   Sleeve is really cheap and really only good for direct coupling, the axial load is not great for sleeve bearings.
   
   So that is the condensed version of motors. It makes little sense but it is a weird commodity.
   
   That is why I talked allexperts into trying a motor category.
   
   It is d**n confusing. Then of course there is the question of what to do with six motor leads marked red, blue, orange, yellow, brown and purple.
   
   Those are all chosen by the manufacturer of the equipment the motor goes on, that way you have to buy the motor from the equipment dealer, unless you know how to OHM out a motor and figure it all out. No small task when you know!
   
   Hope that helps

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