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AC motor speed controller
Posted on 10/2/16 at 2:01 pm
Posted on 10/2/16 at 2:01 pm
I have a motor off of this broken drill press that I want to use for something (no idea what yet). The thing is....I want to put a speed controller on it. Reading around online, half of the people say I need to spend $200+, and then looking at specs for some speed controllers that match, they only run like $20. Any advice? Some words that I've picked up from looking around (and don't understand) are VFD, induction vs brushed vs universal motors, triac, why it's easy with 3-phase and not single
Motor specs:
120v 60Hz single phase
6A
1/3hp
1720rpm
These are examples of what I was looking at as far as speed controllers:
LINK
LINK
LINK
Original speed control on drill press was done via sheave pulleys and tension
Motor specs:
120v 60Hz single phase
6A
1/3hp
1720rpm
These are examples of what I was looking at as far as speed controllers:
LINK
LINK
LINK
Original speed control on drill press was done via sheave pulleys and tension
This post was edited on 10/2/16 at 2:17 pm
2
Posted on 10/2/16 at 6:04 pm to Hammertime
VFD = Variable Frequency Drive. Checkout Direct.com
Posted on 10/2/16 at 6:07 pm to LsuFan_1955
A VFD can regulate the frequency of the AC current to speed up or slow down the AC motor. Typical AC frequency is 60 hertz.
Posted on 10/2/16 at 7:08 pm to LsuFan_1955
I read around and got that. The part I'm unsure on is if I can vary the output of what I believe is an induction motor. Don't know how to tell the difference between that and a brushed motor, and even if I could do it with a brushed motor. I can see the brushes in drills and shite, but not this.
I'm guessing the problem is it'll lose power output linearly if I reduce the speed since it is built to run at 1720 (and they overheat for some reason)
I'm guessing the problem is it'll lose power output linearly if I reduce the speed since it is built to run at 1720 (and they overheat for some reason)
Posted on 10/2/16 at 8:24 pm to Hammertime
Typically a brushed motor and universal motor are the same. These are the motors that scream or high rpm. Drills, vacuums, side grinders, routers, dremels. The router controller (first link) works with these. This controller will not work with an induction motor or the one you describe.
The other two links (fan controllers) work by reducing the voltage which causes a loss of power which reduces the blade speed. I am not sure how these will work on applications other than fans.
To keep the full power at less than full speed you would need to get something that changes the frequency or VFD. This gets into more money for controller. I have never seen one for single phase. There are some cheap 3 phase fractional horsepower VFDs ($100).
I would figure out something to do with the motor that allows it to run full speed.
The other two links (fan controllers) work by reducing the voltage which causes a loss of power which reduces the blade speed. I am not sure how these will work on applications other than fans.
To keep the full power at less than full speed you would need to get something that changes the frequency or VFD. This gets into more money for controller. I have never seen one for single phase. There are some cheap 3 phase fractional horsepower VFDs ($100).
I would figure out something to do with the motor that allows it to run full speed.
Posted on 10/2/16 at 10:04 pm to wt9
quote:Thanks for that info. There is just so much BS online, it is hard to decipher if you don't know the jist of things.
I would figure out something to do with the motor that allows it to run full speed.
Hmm....I already have a bench grinder. Any ideas? It would have to be something semi-stationary because it weighs about 30lbs
Posted on 10/2/16 at 10:24 pm to Hammertime
Yeah a single phase motor can't do what I think you want. To do multiple speeds (like a ceiling fan) they are just switching through different spots on the windings to get the varying voltages that change the speeds (low, med, high). Some cheaper fans are single tap and use a back box that varies capacitance to change the speed.
If you want to be able to infinitely vary the speed then you would need a 3 phase motor and a controller that changes the frequency of the power to vary the motor speed.
The controllers you linked are just variable capacitors but they seem like they have some pretty bad reviews. Under load I would bet they would fail in a short period of time.
If you want to play with a variable speed setup a lot of people rob the motor and controls off of a used treadmill. You can get those super cheap at garage sales and craigslist.
If you want to be able to infinitely vary the speed then you would need a 3 phase motor and a controller that changes the frequency of the power to vary the motor speed.
The controllers you linked are just variable capacitors but they seem like they have some pretty bad reviews. Under load I would bet they would fail in a short period of time.
If you want to play with a variable speed setup a lot of people rob the motor and controls off of a used treadmill. You can get those super cheap at garage sales and craigslist.
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