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I scooped this up for free. Can I use it to control a electric motor to make it variable speed. Thinking of making my own belt grinder. Attachment 193039
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I scooped this up for free. Can I use it to control a electric motor to make it variable speed. Thinking of making my own belt grinder. Attachment 193039
It depends on the Motor
Then I guess the question is what motor to put with it.? I have someone on Craigslist locally with tons of electric motors for sale
Variable-frequency drive - Wikipedia, the free encyclopedia
It just isn't as cheap or easy as you would think :)
Brad/Undream has a really good thread on here about his Grinder build that you will want to read also.. He goes through the issues the he had to deal with as he home built a grinder...
I have heard that. But got something for nothing so just researching now
http://straightrazorpalace.com/forge...r-project.html
That is a good read
It has to do with the eventual application of the motor you're trying to control. A lot of motor controls are rheostats which control the rpms of the motor by (really basically) cutting the power to the motor. For a grinder, you need to keep the power or else you'll stall your wheel out at the lower levels. I have heard that you can use the controls off a treadmill though! Other than that, VFD is the only way to go.
VFDs are good, but if you don't know how to use them, you should get a professional to do the electric work on it. You can fry a motor pretty fast if you don't know what you are doing, it is really easy to screw up, trust me :)
well, by the looks of this and my thinking . it's onto a pulley system to control speed . OR take the major plunge into a kmg grinder . my sister has a ton of scrap metal . and 2 welders and i have nephews who know how to weld . the plans for the grinder on this site look good so who knows what a weekend can bring :)
That can be used depending on it's specs. What is it's input? What is the output? What is it's nominal load/hp rating? What little I know, I know that there are a lot of variables and you need to talk to a person who is skilled in that trade. A normal electrician may not know, may take someone working in an mfg environment as a line electrician to answer your questions.
If you ever "let the smoke out" of electrical stuff, you can't ever get it back and it's toast. If you figure out how to put the smoke back into electrical oop's, please patent it and you will become an overnight billionaire!
Would not the OP's controller be for a DC motor? Reason I ask is I have a setup I hope to use with a controller and a DC motor salvaged from some old printing equipment. Plugs into 110 AC, but has a box with a rheostat and other electronics and is quite variable by turning a dial inside the box.
Just guessing can "let the smoke out" & be dangerous. Mine has a rheostat and is 220v single phase in, 220v 3 phase out:
Attachment 193194Attachment 193195
I can wire a house any day, but that stuff you have to be specific about. You can have 110v in w/ dc out, 220v single phase in w/ dc out, and of course like mine. Other variables are what size motor the controller can handle...mine will handle a 3 hp motor and I have a 2 hp motor on it. Nothing gets much past warm to the hand after running at 25% of 100% (severe load) for several hours with my set-up.
I will send a picture of the back of the unit that details input and output in a few. My sister has tons of metal and I have a nephew who can and has a welder so putting together a 2 by 72 grinder is possible so we will see . pics to come .
Attachment 193213 so here is the unit's label. Will it work ? What motor will it work with ? with the motor loose power as speed is decreased with this motor ? Since I know nada about such things , any help is awesome .
This product is by "leeson" and I will call them directly, maybe they can tell me what electric motor to use with it and if it will loose power while lessoning the speed ? IF so , maybe, just maybe it will work. also, I found a pdf manual for this item .
Hey, more info . here are the specs . NOTE: Heat sink is required on this model for the following applications
3/4 and 1 HP 90 Volts
All 1.5 and 2 HP
Catalog Number: 174307.00
Description: DC SCR CONTROL - NEMA1 ENCLOSED
Input Voltage: 115/230VAC
Output Voltage: 90/180VDC
Output Current: 10 Amps
HP Range: 90V (1/8-1) / 180V (1/4-2)
Direction: NON Reversing
Enclosure: NEMA 1
Ship Weight: 6 lbs.
and here are the features .
LEESON Speedmaster DC control is a general purpose drive designed for use with permanent magnet type direct current motors. NEMA 1 enclosed drives are suitable for most industrial applications. Most controls have a dual voltage switch allowing the control to be used on 115 or 230 volt, single phase, 50/60 Hertz service. However, the proper voltage motor should be selected for use with the power supply input, i.e., 90 volt DC motors for 115 volt input or 180 volt motors for 230 volt input service. Installation and adjustment instructions are included.
thoughts ?
And there you have it! Controller for a DC motor!
and what do I have . you said And there you have it! Controller for a DC motor! I am not sure what that means. pardon my ignorance .
AFAIK Taking AC and converting to variable DC current allows for use of a DC motor which can be run at a desired speed versus an AC motor which relys on internals to determine speed. That! Here is my setup.
Attachment 193249
Ok, I know nada about ac , dc and such so . Looks like its getting complicated for me . So , I am not sure if i am supposed to be encouraged by your response ? Are you saying , yes , you can use the variable control with this variable dc thing to make it all work and save money in the long run ? :)
Well, DC motors and controls like this are quite expensive I am certain. To save money and get it done simply, an interchangable pulley setup to change speeds and a regular,common AC motor would be the way to go, I expect. This setup was salvaged by a friend and given to me and it works. In that regard, it is more efficient for me to use it. Otherwise, I would be going with the former!
What I believe to be true from asking a billion times is,,,
Direct Current motors can be variable. As said , it is because they are made to handle all levels of current on the inside. If the horse power is too low, then you may loose the torque needed to do the work at lower speeds.
Alternating Current motors are made to handle 1 level of current on the inside. Changing that level creates heat in the motor. Enough heat to melt copper :<0)
Mine is AC and is variable speed...
Keep in mind that my motor is 3 phase though...
No. A variable speed AC motor and a fixed speed AC motor are the same. The difference is the drive needed.
AC engines are controlled by changing the frequency of the input signal. For this, a frequency convertor is needed, and decent ones cost money. Sometimes as much or more than the motor itself.
Got TWO 1HP DC motors in my shop and no controller. :/ Found one on craigslist the other day for $200...... It was more than I needed as it had a tach and some other crud I don't need for a belt grinder so I passed.
Tom, my motors came off bulk mail machines. Probably the same as the ones you refer to.
I have a similar lesson drive controlling a variable speed sander I built.
The input plugs into your wall @ 110 vac.
The output will drive either a 90, or 180 vdc motor. You can wire the output either way as its a two wire output plus ground set up. It will run both directions depending on how you wire it, white to white, or white to black wire.
You can get a used dc motor all over, just find the hp, and shaft size you want and you can build from there. Lots of threads from folks on ideas and such.
Just need to verify input and output connections by removing the cover. Make sure any jumpers are set to the desired voltages and voila.. Now, if you are not comfortable wiring a household lamp, get a bud to help. Ideally with a multi meter to verify everything before you connect your motor.
Cheers.
We need to find an electrical engineer and get him hooked on a straight razor and the forum :<0) Mine is a woman that is 150 years old ,ex navy, and passed on being the first woman astronaut. She takes the time to explain all the yada french yada yada Swahili, yada plain english and I forget it all as I walk away. Now I just ask " can I do this or not ? "
Mikeb52. Thanks for the input about the leeson drive I have. I got it from a electric exhaust fan system that my work place got rid of. They upgraded so I figured if it could control the speed on the fan system st my work then it should certainly work on a motor for a grinder.provided it is the right motor. So your saying I need a 90 or 180 vdc motor ? I just want to be sure of what to buy before I look into it further. I don't know how to wire squat. But one of my nephews does so he would help for sure. Anyone else chime in to help when you can. I am patient and have months to work on this though I would like to get it done sooner :)
I spoke with a person from Leeson directly and he pointed me in the direction of what motor to get with the controller I have. that being said, the motor he showed me was 2000 dollars. so, that aint gonna happen. now to a vfd and motor combo . cheapest and best route I can see as suggested previously by you all. thanks,
I won't say how much I spent on my vfd and leeson combo for my belt sander, but those prices are about right.
Used 90 vdc motors in the 1750 RPM range can go for under a couple hun and usually just need replacement carbon brushes.
That being said, a premade, bundled solution might be best for your application and electrical experience. An old wood lathe with belt drive speed control could be converted to your drive side. Were you in Ontario I would give you some older swag.
Good luck with your project.
I added a pic of my set up below to maybe help with ideas. I have a pair of dc motors powered off a common leeson drive running a buffing wheel and sanding belt set up. I added a couple of switches so I can run either unit in Frwd or reverse.
Attachment 193670
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so , can anyone answer this for me . will my leeson speed control work on the above treadmill motor ?
Or maybe this one on the BAY
Treadmill DC Permanent Magent Motor Wind Turbine Gen | eBay
I was wondering about this one sice it is an 90 vdc
Your first link doesn't work.
Need to know the voltage rating of the treadmill motor to be able to answer.
If it's a dc motor, @ either 90 or 180 volts DC it will. The leeson output goes to the treadmill motor input, you could mount the drive on your grab bar with tie wraps to change speeds on the fly.
Pics of motor, and wiring connection choices will help give a more specific answer.
Good luck.
edit; that motor in the ebay link, if 90 vdc will work. shaft size may matter for a direct fit on a treadmill.
If you are considering a treadmill motor, cannibalize the whole thing...they have their own controllers. One of our members here has done that and just has the controller off to the side of his grinder.
Yeah rethinking it all. Thinking back to vfd and motor