Electric Motor question
Electric Motor question
Being a confirmed EI, I have a question for you whiz kids.
I have a 1/4 hp 115V DC Motor and I'd like to use it, but with the proper "stuff" to make it variable speed.
1) What do I need and where do I get it?
2) Would it be better to trash this and get an AC motor with a VFD?
This would be used to drive a very fine wire brush used for 'carding' rust blueing, so it does not need to be very powerful.
--earlgo (Electrical Incompetant)
I have a 1/4 hp 115V DC Motor and I'd like to use it, but with the proper "stuff" to make it variable speed.
1) What do I need and where do I get it?
2) Would it be better to trash this and get an AC motor with a VFD?
This would be used to drive a very fine wire brush used for 'carding' rust blueing, so it does not need to be very powerful.
--earlgo (Electrical Incompetant)
Before you do anything, you must do something else first. - Washington's principle.
Re: Electric Motor question
Leeson, Bodine, KB, all make controllers for these motors. Look on Fleabay, should be pretty reasonable.
Bob D.
Bob D.
3/4" Juliet II 0-4-0
3/4" Purinton Mogul "Pogo"
3/4" Hall Class 10 wheeler
3/4" Evans Caribou/Buffalo 2-8-0
3/4" Sweet Violet 0-4-0
3/4" Hunslet 4-6-0
3/4" Kozo A3. Delayed construction project
1 1/2" A5 Camelback 0-4-0
3/4" Purinton Mogul "Pogo"
3/4" Hall Class 10 wheeler
3/4" Evans Caribou/Buffalo 2-8-0
3/4" Sweet Violet 0-4-0
3/4" Hunslet 4-6-0
3/4" Kozo A3. Delayed construction project
1 1/2" A5 Camelback 0-4-0
Re: Electric Motor question
Minaric and Dart are two more excellent brands, I use these.
RichD
RichD
Happy Rails !
RichD
Colorado Midland Ry Ten Wheeler U/C
Kerr Stuart Wren NG 0-4-0 U/C
www.csppry.org
Imagination is your best tool.
RichD
Colorado Midland Ry Ten Wheeler U/C
Kerr Stuart Wren NG 0-4-0 U/C
www.csppry.org
Imagination is your best tool.
Re: Electric Motor question
2 wires or are there 4 wires coming out of it? 4 wires means that it has a field, so you want a dc controller that will support a field. There are a lot of the newer ones that won't. They will only run a permanent magnet motor. Of course that is ok if you have only 2 wires coming out of the motor.
Jim B
Jim B
Re: Electric Motor question
The motor has brushes and there are 6 wires coming out.
I said I was an EI but that wasn't enough of a clue for anyone to pick up on. Giving me brand names for thingys is like having someone ask for help with transportation for around town and the answer being Ford, Chevy or Honda.
What do I need?
--earlgo (Electrical Incompetant)
I said I was an EI but that wasn't enough of a clue for anyone to pick up on. Giving me brand names for thingys is like having someone ask for help with transportation for around town and the answer being Ford, Chevy or Honda.
What do I need?
--earlgo (Electrical Incompetant)
Before you do anything, you must do something else first. - Washington's principle.
- SteveHGraham
- Posts: 7788
- Joined: Sat Jan 17, 2009 7:55 pm
- Location: Florida
Re: Electric Motor question
Sorry to hear about your ED (Electrical Dysfunction).
Every hard-fried egg began life sunny-side up.
- Bill Shields
- Posts: 10581
- Joined: Fri Dec 21, 2007 4:57 am
- Location: 39.367, -75.765
- Contact:
Re: Electric Motor question
AC with VFD can solve many problems EXCEPT good torque at very low speeds....which is why as lot of DC motors are in service.
Most AC (3 phase) motors NOT SPECIFICALLY DESIGNED to be run at very low speeds on a VFD can have problems with ET (Extreme Temperatures)
VFD / AC are not MW
(Magic Wand)...
Most AC (3 phase) motors NOT SPECIFICALLY DESIGNED to be run at very low speeds on a VFD can have problems with ET (Extreme Temperatures)
VFD / AC are not MW
(Magic Wand)...
Too many things going on to bother listing them.
Re: Electric Motor question
If the motor has brushes, you can run it through a light dimmer. A 1/4 hp motor will run on a light dimmer easily. I have a few set up that way. Cheap and easy.
Pete
Pete
Just tryin'
Re: Electric Motor question
I asked my friend the exact same question and provided the same information to him about the 110V DC motor.
He took the time to explain exactly what I needed and how to check the motor leads.
I need a Full wave rectifier 300VPPV 5 amp capacity and a dimmer switch with 300W capacity or a AC 110V Rotary Knob Voltage Speed Controller DC Motor Variable DC 0-90V. All are available on E-bay for less than $35 total.
He also explained how the bridge rectifier modified the Sinusoidal AC into a Cycloidal wave and how the dimmer switch chopped the AC into pulses.
But thanks anyway to you fellows for the helpful suggestions especially about the possible use of the dimmer switch for a speed control.
--earlgo
He took the time to explain exactly what I needed and how to check the motor leads.
I need a Full wave rectifier 300VPPV 5 amp capacity and a dimmer switch with 300W capacity or a AC 110V Rotary Knob Voltage Speed Controller DC Motor Variable DC 0-90V. All are available on E-bay for less than $35 total.
He also explained how the bridge rectifier modified the Sinusoidal AC into a Cycloidal wave and how the dimmer switch chopped the AC into pulses.
But thanks anyway to you fellows for the helpful suggestions especially about the possible use of the dimmer switch for a speed control.
--earlgo
Before you do anything, you must do something else first. - Washington's principle.
Re: Electric Motor question
I bought the AC 110V Rotary Knob Speed controller 0-90V DC. My friend figured out the motor windings and put it all together. It works better than I had hoped and now I have a variable speed carding wheel for my experiment in rust blueing.
--earlgo
--earlgo
Before you do anything, you must do something else first. - Washington's principle.
Re: Electric Motor question
In the interest of closure, this is what I ended up with in regard to the variable speed DC motor and controller.
It isn't pretty but it works. --earlgo
It isn't pretty but it works. --earlgo
Before you do anything, you must do something else first. - Washington's principle.
- neanderman
- Posts: 896
- Joined: Mon Jan 09, 2012 7:15 pm
- Location: Cincinnati, Ohio, USA
Re: Electric Motor question
Invaluable info! I'm not very good with electronics, but how to design a 'basic' DC power supply is something I do know. And it has served me very well over the years. Did he recommend a filter capacitor across the DC side of the rectifier? I've found that, even with motors, it can make a real difference in smoothing the DC output.
Ed
LeBlond Dual Drive, 15x30
US-Burke Millrite MVI
Atlas 618
Files, snips and cold chisels
Proud denizen of the former "Machine Tool Capitol of the World"
LeBlond Dual Drive, 15x30
US-Burke Millrite MVI
Atlas 618
Files, snips and cold chisels
Proud denizen of the former "Machine Tool Capitol of the World"