i have a motor rated for 120vdc and i dont know how to power it?

Question

it is 2.5 HP @5600 rpm the only thing I can think of would be to use 10 12vdc bateries. is there any way i can power it from a 120vac 15amp outlet.

when i say power it from the outlet, i mean with some sort of converter

i have seen those universal motors. they have elecromagnets, bushings, and a wound core, so they can run off of ac or dc. this is a permanant magnet dc motor

Answer 1

Firstly, most motors which run on ac can run on dc as well. A lot of hand tools, for example; also, kitchen blenders, and the like. These motors get their magnetic field from wound coils, not magnets. If your motor has magnets inside, then it can't run on ac. However, all you need to power this motor is a full-wave rectifier, which you can even buy on line. There are four terminals on it. Two are ac inputs, marked "~"; a third is marked "+", the other "−"; needless to say, they deliver dc current, according the polarity shown.

Somewhere on the motor you should find a metal plate with some data: manufacturer, operating voltage, frequency, rpm, power, AND current consumption. This value probably exeeds 15 A. But as long as it is under 20 A, you may safely use a rectifier rated 25A @ 200 V, such as the IR 26MB20A. $6.64 apiece in Newark in One. There´s nothing wrong using a larger unit, 30 or 40 A -except for price, of course. You'll need a fairly-sized heatsink, as well.

Although outlets rated up to 50 A are not uncommon, you may prefer to "hard-wire" this rig, doing without an outlet. Whatever the case, a dedicated breaker should be assigned to this circuit at your service panel. Just be sure the wire -and breaker- can stand motor rated current, plus an additional 25%.

Greetings.

Oh, by the way, I found your question about the check incorrectly paid by the cashier; regrettably, it was too late to answer. Anyway, the exact amount is $31.63.

Jan. 8th update:
Oops. I certainly made a blunder in the first paragraph. I wrote dc when I intended to put ac. It is corrected now. Thanks to J C. If it weren't for him, its unlikely I would spotted the error. However, I also wish to make clear I NEVER suggested filtering the dc waveform. In fact, an ordinary (average value reading) voltmeter connected across the -unfiltered- rectifier output terminals would indicate 108 V. This is the AVERAGE value of a full-wave rectified waveform whose RMS value is 120 V (170 V peak value).

Answer 2

Watch out. IF YOU DO NOT KNOW WHAT YOU ARE DOING THEN DO NOT DO IT.
(You might consider wearing rubber gloves for safety's sake.)
If you rectify and filter AC you will end up with 160-170 volts (the peak voltage) and not the 120 volts AC you feed in. Measure it before hooking it up.
I do not know why a permanent magnet motor could not be run on DC, I thought it was only AC they could not run on. As long as the motor has brushes and a commutator (not slip rings) it should work.
The best efficiency I have seen for a rare-earth magnet motor was 76% but I am no expert.
I suggest you start out slow. Put a toaster or hot plate in series with your motor. Then try both (in parallel) in series with the motor etc..
The suggestion of using the two phases of 240V as a centre-tapped supply to two-diode full wave rectifier is a good one as it solves the 15 amp limit problem. (Although many electric motors are over-rated. The number of 2.5 hp shop vacs out there with an 18 gauge power cable is astounding.) 743 Watts in a hp.
Many kitchens have double wired outlets. Check yours with a 240 V. ac voltmeter.
Make sure your motor is clamped down well as 5600 rpm can generate a lot of counter torque.

Answer 3

I did a little math, and assuming a typical efficiency of 80% your motor is going to require just about 20 Amps. If you have an outlet that can supply that, a simple bridge rectifier can handle the AC to DC conversion. A rating of 200 V @ 50 A should be sufficient to absorb any surges.
If you have a 230 V line you could use that by treating it as a 230V transformer with a center tap (neutral); thereby creating a Full-Wave center tap rectifier. Use the neutral as the Negative(-) motor connection. Connect the Cathode ends of two 50A 400V diodes together, that is your Positive(+) motor connection. Now take one of the diodes, connect its' anode to one side of the 230 V line. Take the other diode, connect its' anode to the other side of the 230 V line.
This will give you 120 VDC and all the current you need.
But be careful! You are working with voltages that can be lethal. If your not sure of what you are doing ask for help.

Answer 4

It is possible to get 120 volts DC off the wall outlet, but the most you can get is 15-20 amps and I think you will find a 2.5 hp motor takes more amps than that. Workshop appliances like an air compressor with 2.5 amp motors require high capacity circuits or 220 volt circuits. Worse, if the motor stalls, it draws even more current.

Answer 5

2.5 horsepower is 1856 watts, or 15.5 amps at 120v. You can't run this motor at full load from a 120v 15 amp outlet.
Universal motors are commonly made in this power range although they are usually marked for ac/dc voltage. This is probably what you have, and you could run it from a 120vac output rated 20 amps. If you have a different type of motor, it won't run and/or it will pop the circuit breaker, but it won't do any other damage in a few seconds of no-load testing.

Answer 6

This Site Might Help You.

RE:
i have a motor rated for 120vdc and i dont know how to power it?
it is 2.5 HP @5600 rpm the only thing I can think of would be to use 10 12vdc bateries. is there any way i can power it from a 120vac 15amp outlet.

Answer 7

You can not use a DC (direct current) motor with AC(alternating current). You may get a power convertor (expensive) or the 10 12 volt batterys sounds good.

Answer 8

in an electrical shop u can get a small transformer (it will not cost much) and ask the shopper to convert into ur desired ratings by using suitable capacitors(shopkeeper must be knowing it)
i had done exactly same for 24 vdc motor requiring 10 amp

Answer 9

120v Dc Motor

Answer 10

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