Motor 120V 3-Phase

[Tony Hwang]

Hi, If he can see it as 220V winding with center tap.(Edison circuit). No phase involved here. Tony

[volts500]

Yes, usually in Canada.

Sure it is. The FLA (Full Load Amps) is only 1.4 amps. 1.4 amps x 125% =

1.75 amps The 16 gauge wire is sufficient for 1.75 amps, as long as the wire is rated for 600 volts.

Don't bother, it's not going to work.

Sorry, but you still have a $5 boat anchor. You may be able to find a 575 volt 3 phase converter, but if you can, I suspect that it will cost as much as a new 1 HP (120 volt or 240 volt single-phase) motor. Keep trying, you should be able to find a used motor out there..........except this time don't buy it unless it is a 120 volt or 240 volt _single-phase_(PH-1) 1 HP motor.

[j j]

the problem is the lack of 3 phase power, not the voltage itself... how did you connect it to an ordinary house plug? an ordinary 3-prong house plug has 1 ground, 1 neutral and one hot. you need at least 3 hots for this motor...

[Dean Hoffman]

No. What you actually have is 240 volts single phase. It's the tap in the center that gives you the 2 120 volt hot legs. That tap could be moved to change the output to, say, one line at 216 volts and the second line at 24 volts. The total voltage would still be 240. The transformer is just taking 7200 volts single phase and cutting it down to 240 single phase. Here are a couple links that might help. There are 2 or 3 pages at the first one. There's a next button way at the bottom to change pages.

The second one is an old military training manual. There are some explanations for generators and transformers.

As someone mentioned the degrees out of phase refers to the rotation of the generator making the power. One phase would be X degrees out of phase with another. That's not possible if only one of the power company's lines is being used. Look at the differences between a single phase generator and a three phase generator at those links. Dean

[j j]

look, I know this already.

you have 3 wires, one neutral (the reference) and two phases or legs or whatever you want to call them.

take an oscilloscope and measure the two voltages taken with respect to the neutral. Are the two sinusoidal signals in phase or out of phase by 180?

[volts500]

They are "in-phase", only the _polarity_ has changed. Do they cross the zero line at the same time? Do they peak at the same time? You're referencing the _same_ waveform with respect to polarity _only_. How can a single waveform be "out-of-phase" with itself?

[HA HA Budys Here]

You can lead a horse to water, but you, JJ, will probably die from dehydration.

The almighty HaHa has spoken.

[Tony Hwang]

Hi, JJ is funny guy for sure. Don't think he really has practical experience. like climbing poles or wiring up transformers, hooking up motors, power distribution, etc. Tony

[j j]

well, I don't know what your definition of phase is. where I live, the two waveforms are out of phase by 180. in a shorted transmission line, for example, the reflecting wave is out of phase by 180 while in an open transmission line, the reflection is in phase. I didn't hear anyone say that the reflection in a shorted TL is in phase, but reversed polarity.

Do they cross the

but there's 2 waveforms. I get 2 hot wires, and the waveform is not in phase.

take a generator with 4 (separate) poles. the 4 waveforms are out of phase by 90, so the third is out of phase by 180 with respect to the first, and the fourth with respect to the second.

same goes for any even fraction of PI.

[HA HA Budys Here]

That's all fine and good. One doesn't need hands-on experience in power distribution to comprehend, or rather in this case, *accept* that there's a difference between a "phase" and a "leg", or that you don't have 2 "phases" in a home just because you've been calling the legs phases for years.

Many electricians, even utility workers will use the term phase when making a distinction between the 2 legs of a single-phase 240v service. The trouble starts when one tries to apply practical electrical theory to this misnomer.

[hawthornerobert90]

It's a railway motor.. 110 volt 3 phase.. Railway is exempt from the NEC code.. Source from a 110volt 3 phase generator.

[Taxed and Spent]

Wow - what kind of a washing machine are you running there, bud?

[bob haller]

the OP asked about this in 2003. i assume hehas solved the problem by now

[Taxed and Spent]

I only see today's date. Where do you see the 2003?

[Tony944]

Check operating Frequency???

It's a railway motor.. 110 volt 3 phase.. Railway is exempt from the NEC code.. Source from a 110volt 3 phase generator.

[keith20mm]

With all due respect, you can find a 120V 3 phase motor in many Carrier and Payne brand furnace boxes. The fan blower motor is 120v ECM, electronically commutated motor, which is a 3-phase motor with an attached speed controller. These were originally built by GE. GE then sold off the motor design.

The motor model number is:

5SME39SL0122 or 5SME39SL0310 or HD52AE120

Remove the rear section of the motor, retained by two screws, then disconnect the 3-wire connector between the motor and the speed controller.

This leaves the front section of the motor, which is a 1HP 3-phase 120v motor

Connect a Reliance Electric SP500 VFD model 1SU11001 (120VAC input, single or 3-phase), 120VAC output 3-phase.

Connect a regular grounded line cord to the RS inputs (black and white), green to the grounding screw, and the motor's 3 wires connect to the RST output terminals.

Plug in the controller, let it run its self-test, then press start. The motor will immediate spin up. Press stop, then Reverse, then Start. The motor will follow, and reverse rotation

Pressing the up or down buttons will vary the motor speed up to about 1800RPM.

You can provide a 5k pot for speed variable, or use 0-10VDC speed control, or 0-20ma speed control.

Long and short of it, the variable speed fan blower motors in the Carrier and Payne (high efficiency) furnace units are 3-phase... just remove the rear speed control section that comes on the motors.

These motors run around $800 retail, new, yes, horrendous, but find a replaced unit and grab the blower motor.

The furnace inducer is also variable speed, 1/5hp, and the outdoor compressor fan unit contains a variable speed 1/3 hp 3-phase motor, both having similar speed controls on rear end.

The outdoor fan is 240v, however, and the inducer fan motor is 120v 3-phase.

[keith20mm]

Sorry, meant to write 'connect notor to UVW terminals'

[bighungry3535]

You can use a vfd to get 3 phase from single phase. You child technically use this in your home. I have seen these motors on boats with delta systems for their 120vac service.

[bruce2bowser]

There are inverters (3 phase)