Advice needed for powering universal motor
Advice needed for powering universal motor
(OP)
The equipment has a brushed motor running on fully rectified and unfiltered 120 VAC. The motor is rated at 13 Amperes. There is no nameplate. I do not know the RPM.
The goal is to either operate the motor on batteries or replace the motor with one which will run on 24 VDC (two 12 volt batteries) at the lowest possible cost. I really don't want to spend $400 on an inverter and waste all that power in the conversion.
I know that I could measure the RPM and find a motor, but I suspect that the cost would be considerable.
The goal is to either operate the motor on batteries or replace the motor with one which will run on 24 VDC (two 12 volt batteries) at the lowest possible cost. I really don't want to spend $400 on an inverter and waste all that power in the conversion.
I know that I could measure the RPM and find a motor, but I suspect that the cost would be considerable.
RE: Advice needed for powering universal motor
RE: Advice needed for powering universal motor
Back in the day, trailer mounted, engine driven welding sets typically had a 90 Volt DC receptacle to run heavy duty 120 Volt AC angle grinders. Some of those grinders would be in the 13 Amp range.
at 24 Volts it may run too slow to be useful.
By the way, both Tug and I are giving you WAGs (Wild Ass Guesses) because you don't include enough information for a proper answer.
If you tell us what the equipment is, it will save a lot of time and someone may have direct experience with your device.
Bill
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Ohm's law
Not just a good idea;
It's the LAW!
RE: Advice needed for powering universal motor
Thank you Bill and Tugboateng.
The application is a remote controlled electric mower.
Starting with a 120 VAC corded mower. Adding a 24VDC wheelchair. Trying to eliminate the power cord for the mower. It takes an hour to mow the lawn with the mower by hand. The mower not only cuts the grass, it sucks grass up and mulches it as well so there is a lot of air being pushed around. The mower has a simple full bridge diode between the switch and the motor leads.
I don't think that there is an inexpensive solution, except to leave the mower corded and make an umbilical cord for the chair control. Hopefully, interference will not become a problem.
If this turns out to work reasonably well, I will post instructions on https://www.instructables.com/ so that others who want to mow their own lawns in the heat and humidity can join me. (The last time I mowed it took far too many sessions to complete.)
Thanks again!
RE: Advice needed for powering universal motor
But good luck, let us know how it comes out.
" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
RE: Advice needed for powering universal motor
Anecdotally, a sharp blade is also key to finding errant rocks which a dull blade will never hit.
RE: Advice needed for powering universal motor
RE: Advice needed for powering universal motor
https://www.youtube.com/watch?v=q2bP7j7kLBI
" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
RE: Advice needed for powering universal motor
That's just nuts.
Muthu
www.edison.co.in
RE: Advice needed for powering universal motor
RE: Advice needed for powering universal motor
Keith Cress
kcress - http://www.flaminsystems.com
RE: Advice needed for powering universal motor
Perimeter barrier system:
No need for expensive and time consuming burial.
Easily moved.
Easy recall of grass cutters after use.
Edit: I forgot to mention the free fertilizer as an added benefit.
Bill
--------------------
Ohm's law
Not just a good idea;
It's the LAW!
RE: Advice needed for powering universal motor
If only. My wife is anti-dog because she doesn’t want to care for it and she knows I will eventually forget (which is true). Our new neighbors next door have a miniature Australian Shepherd, cutest thing in the world, they have no ground squirrels. I am thinking of cutting a hole in our fence so she can patrol our yard too.
In the mean time, my wife is “emulating” a dog by spraying ammonia around the yard every day, it seems to be having an effect. Way more work than caring for a dog if you ask me, but I know better than to bring it up…
" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden
RE: Advice needed for powering universal motor
I don't understand forgetting to care for a dog though. Mine used to bring me his bowl when it was time.
RE: Advice needed for powering universal motor
I'd make a deal with the neighbor - working dogs enjoy being useful. I've read of owners taking herding dogs to playgrounds and soon realizing that all the 3-5 year olds are in a tight group, not a nip or bark required, just getting in the way when a child is going away from the desired group.