Variable speed motor setup

C L Wilkins

C L Wilkins

Joined
Mar 18, 1999
Messages
2,114
What are some of the variable speed motor setups that you guys are using? My Hard-Core has a 1 1/2 horse Baldor. What else is out there? Leeson? GE? A friend of mine is looking.

C Wilkins
 
i dont think the motor is nearly as important as the control set up....also, make sure you get a 1725 rpm motor (you probably already know that) cause you will want mostly slow speed 80% of the time...and you will get more power with 20% of 1725 than 10% of 3600...right???!!!

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i'm making a grinder and using a 1 1/2hp leeson variable speed motor, with leeson controls with reverse. top speed is 1725, because you get more torque at 1725 than at 3450.
 
I just set my Square Wheel up with a variable speed setup from K&G Supplies. I got the 1hp Leeson setup with controler & heat sink for $535.00. So far I am extremely pleased with it.

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As long as it is realized and accepted that warriors must comprehend right and wrong, and strive to do right and avoid wrong, then the way of the warriors is alive.
 
Most everyone is using dc motors and controllers for variable speed, at least it seems. I have found through my job a way to take a 3ph ac motor and controll it using a variable frequency drive. You can get higher torque than with DC at lower rpm's. The company that sells the controllers ays that you can even use 1ph power but it will require a higher capacity inverter. They seem to cost around $250. for a 1hp conversion then the cost of the 3ph motor but I think the extra torque would be worth it. A standard 2x72 could probab;y be run with a 1hp 3ph rather than a 2hp dc. I do not remember the CO. name right off and will find it out and post it when I do. Let me know if anyone is interested.
 
sounds like a great idea..unfortunately all of us are working out of our home with single phase, so in addition to the cost of the above we would also have to get a phase converter.....when i get a machine with a 3 phase motor I always throw it away and go get a single phase....dont know if thats the smart thing to do or not.

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I don't believe alot has been said about this type of motor control has been so I'm putting in my $.02-- I put an ac freqency inverter variable speed controller on my surface grinder. It not only gives me reversing and breaking capabilities, but it has a digital panel with 15 speeds, remote operation and ACCEPTS SINGLE PH.230v INPUT. Power is derated by 40% if single phase input is used just as with normal static converters. I've put a static converter inline with the variable speed drive to trick it into a true roto-phase. It also allowed me to stuff a motor double the size of the original motor inside the casting because there is no longer a capacitor on the motor. one last fact about these controllers is that only "vector" models will give full torque throughout the speed range. the cheaper controllers will give noticable torque failures at the lower speeds just the same as if you use a shunt wound motor vs. a PM in the DC application

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