Controlling speed of electric motor

  • Profile photo of James HolstJames Holst
    Keymaster
    SE Minnesota
    Posts: 16,355
    #1264271

    Guys

    I’m looking for suggestions on the best way to control the speed of an electric motor. I know, I know… I could reduce the final speed through gears / pulleys… I REALLY don’t want to go that route due to space limitations. This motor will be required to turn a very light load. Is there a quick / clean way to have variable speed control on a motor like this one?

    web page

    Thanks in advance.

    avatarjon_jordan
    Participant
    St. Paul, Mn
    Posts: 10,928
    #803239

    I’d go to Menards and get a variable control switch used for a cieling fan. Looks and works like a dimmer switch.

    -J.

    Profile photo of brad0383brad0383
    Participant
    Farmington, MN
    Posts: 354
    #803242

    Quote:


    I’d go to Menards and get a variable control switch used for a cieling fan. Looks and works like a dimmer switch.

    -J.


    Be careful, make sure that it can handle the power requirements. The motor in that link you posted was 828 watts.

    Profile photo of jesse-krookjesse-krook
    Participant
    Hudson,WI / St.Croix River USA
    Posts: 5,907
    #803243

    Quote:


    I’d go to Menards and get a variable control switch used for a cieling fan. Looks and works like a dimmer switch.

    -J.


    I dont think that a ceiling fan switch is recommended click on the link I pasted above got some good info for the same question

    avatarfrancisco4
    Participant
    Holmen, WI
    Posts: 2,814
    #803244

    I got a call into my Dad. We use to have one with an adjustable speed for roasting pigs. I will see if he can dig it up and get you some specifics.

    FDR

    Profile photo of James HolstJames Holst
    Keymaster
    SE Minnesota
    Posts: 16,355
    #803245

    Quote:


    Quote:

    I’d go to Menards and get a variable control switch used for a cieling fan. Looks and works like a dimmer switch.

    -J.


    Be careful, make sure that it can handle the power requirements. The motor in that link you posted was 828 watts.


    I can downsize the motor, too. In all honesty I could get by with a 1/8 hp motor… or maybe even smaller. The load on the motor will be very small.

    Profile photo of nic-habecknic-habeck
    Participant
    Lake Mills, WI
    Posts: 831
    #803246

    Looking for steps in speed or to have full adjustability from off to full rpm?

    What are you using it for?

    Profile photo of James HolstJames Holst
    Keymaster
    SE Minnesota
    Posts: 16,355
    #803247

    Quote:


    Looking for steps in speed or to have full adjustability from off to full rpm?

    What are you using it for?


    I would prefer to have full adjustability but if I could get speed steps that went from off to slow with SUPER SLOW somewhere in between I’d be a happy guy.

    I’m building a turn table for an upcoming studio shoot. We need 360 shots for a particular project we’re working on and a SLOWLY rotating turn table would be the ideal solution.

    Profile photo of James HolstJames Holst
    Keymaster
    SE Minnesota
    Posts: 16,355
    #803248

    As long as I have your guy’s attention has anyone seen a place where you can buy electric motors smaller than 1/4 hp?

    Profile photo of chris-tucknerchris-tuckner
    Participant
    Hastings/Isle MN
    Posts: 12,243
    #803249

    Go to or call Grangers and tell them what you need. They can hook you up with a rheostat or a geared down motor for the job.

    Profile photo of ottomaticaottomatica
    Participant
    Lino Lakes, MN
    Posts: 1,262
    #803250

    For a cheap solution I think you want a Rheostat. Here’s one that can handle up to 3 amps:

    Rheostat

    PM me, I do motor control for a living (unfortunately not AC motor control) but I should be able to get you where you want to go and have a couple other options that may work for you.

    Profile photo of ottomaticaottomatica
    Participant
    Lino Lakes, MN
    Posts: 1,262
    #803252

    Quote:


    As long as I have your guy’s attention has anyone seen a place where you can buy electric motors smaller than 1/4 hp?


    Axman will have these pretty cheap. I have a few on hand but they’re not AC motors.

    Profile photo of mrwalleyemrwalleye
    Participant
    MN
    Posts: 963
    #803256

    I have just the thing you need for that
    motor with 0-400rpm and a pully on the end for a v-belt.
    its a ZERO-MAX
    model=E2 power block
    12-lbs torque
    0-400 rpm
    shoot me a PM if you need it

    Profile photo of James HolstJames Holst
    Keymaster
    SE Minnesota
    Posts: 16,355
    #803257

    Thanks guys…. you’ve all been a huge help!

    Profile photo of joe-scegurajoe-scegura
    Participant
    Central MN
    Posts: 890
    #803260

    I finally get to use my engineering knowledge on IDO. James, chucker is close but I don’t think you can get just any old variable switch. You’ll need a variable solid state switch that’s rated for 10 amps and 120 volts. Also you shouldn’t run this motor at less than 40% of its rated RPM’s or it will generate too much heat. I have a local expert I deal with, he sells all types of motors and motor controls. I can hook you up with him if you have more questions.

    Profile photo of kootykooty
    Keymaster
    1 hour 15 mins to the Pond
    Posts: 16,519
    #803261

    Can’t you just get Bk to lay under the table and spin it?

    avatarjerry b
    Participant
    western WI
    Posts: 1,381
    #803262

    I’m the furthest from an electrician you’ll ever find, but somewhere, sometime back I was in the exact situation. I was told in order to control a motor with a rheostat, your motor needs to be a “shaded pole” motor. Don’t ask me what it is, but that’s the info I got jerr

    Profile photo of Steve RootSteve Root
    Participant
    South St. Paul, MN
    Posts: 3,289
    #803271
    Quote:

    As long as I have your guy’s attention has anyone seen a place where you can buy electric motors smaller than 1/4 hp?


    James, here’s a link to a surplus place out in California I’ve dealt with. They have different sized gear motors both AC and DC, maybe they’ll have something that will work for you. I’ve had pretty good luck with these guys on all kinds of stuff including head lamps and flashlights.

    Rootski

    All Electronics

    Profile photo of nic-habecknic-habeck
    Participant
    Lake Mills, WI
    Posts: 831
    #803272

    Your going to need some sort of reducer or drive train to mechanically alter RPM. It will not be safe to run that sort of motor for any period of time at the type of speeds you are looking for.

    Profile photo of chris-tucknerchris-tuckner
    Participant
    Hastings/Isle MN
    Posts: 12,243
    #803278

    Quote:


    Can’t you just get Bk to lay under the table and spin it?


    Correct me if I’m wrong, but I think that is what he was trying to replace.

    Profile photo of KirtHKirtH
    Participant
    Lakeville
    Posts: 3,852
    #803290

    Quote:


    Quote:

    Can’t you just get Bk to lay under the table and spin it?


    Correct me if I’m wrong, but I think that is what he was trying to replace.


    Hey hey hey, you guys leave poor BK alone , he is inocent in this post

    Profile photo of t-ellist-ellis
    Participant
    Colorado Springs, CO
    Posts: 1,316
    #803292

    James,

    Why not look into an electric turntable: Turn Table

    It costs $160 and is a complete setup that rotates 2-9 rpm’s, can rotate left or right, and supports 125 lbs. It also has variable speeds control and doesn’t look too bad.

    Profile photo of James HolstJames Holst
    Keymaster
    SE Minnesota
    Posts: 16,355
    #803304

    Quote:


    James,

    Why not look into an electric turntable: Turn Table

    It costs $160 and is a complete setup that rotates 2-9 rpm’s, can rotate left or right, and supports 125 lbs. It also has variable speeds control and doesn’t look too bad.


    Tim

    I looked on Ebay for something like that and all I found was record players. I ordered that turntable. It will be here in 3 – 5 biz days. What a huge time saver.

    Profile photo of t-ellist-ellis
    Participant
    Colorado Springs, CO
    Posts: 1,316
    #803307

    Actually Google gets the credit on this one. I thought that might fit the application and the price seemed good. Got to keep that valuable time open for fishing.

    avatar2jranch
    Participant
    Arcadia, WI
    Posts: 851
    #803423

    I don’t think you can use a regular motor as a variable speed motor. You have to have a motor that is capable of being a variable speed and I think that is what is called a “shaded pole” motor. Some one correct me if I’m wrong.

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