What's new
What's new

575v Transformer vs 3 phase line reactor?

amoniave

Aluminum
Joined
Jan 28, 2012
Location
Canada
Have a cpl side mount garage door openers I'm hoping to use.

both 575v 3 phase. I have a number of single phase to 3 phase VFD's, All 230v.

Mtr's are only 1/2hp, so like 1 amp each on 575v. (maybe 5 amp on 230v SP)

Was looking up 575v transformer and these phase line reactors keep coming up and for pretty cheap.

1. Is there a way to go from 240v single, straight to 575v 3 phase Without using a VFD? (or any phase convertor)

2. Can someone explain what a 3 phase line reactor is?

3. What is my best option here?

Thanks!
 

thermite

Diamond
3. What is my best option here?

Shed the AC motors. Fab-up for 12 V DC ones. Use a transformer and rectifier. Better-yet, batteries on light maintenance charge..

Then you can open and close the fool door in a power outage.
With jumpers off the vehicle right outside it, if need be.

Better to have a skosh of 12V for emergency LED lights, gadgetry battery charging and stuff?

Use of dirt-common auto/truck/marine/RV goods lets you do a LOT of "emergency fallback" stuff on the cheap.

Two marine/RV hybrid starting/deep(ish) discharge 12V as can be EITHER paralleled or series at-will for 24 VDC OR 12 VDC, are around a hundred bucks each, can easily last ten years. Or longer. Maintainer chargers are cheap. So are modest solar panels.

Beats all Hell out of candles, dead cell phones, dead laptops and routers, dead cordless tools, too!

With an inverter 12V or 24V DC to 120 VAC? Two is all it takes to keep the fridge-freezers cold so I don't have to run the Diesel all night.

I don't open them all that often when sound asleep, anyway.

:)
 

amoniave

Aluminum
Joined
Jan 28, 2012
Location
Canada
These openers have chains for manual opening if needed, so I'm pretty well covered there.

Looking to keep them 575v and some advice on transformers and where to place, before or after VFD, and if VFD is needed.

Thanks!
 

thermite

Diamond
These openers have chains for manual opening if needed, so I'm pretty well covered there.

Looking to keep them 575v and some advice on transformers and where to place, before or after VFD, and if VFD is needed.

Thanks!

Welll. Before I'd spring for 600 Volt-class transformer, switchgear and VFD just to open and shut a door?

I'd use the chains and go something more rewarding with the savings.

Point. I did do. 120 Volt AC 1/2 HP chain-drive opener on the eighteen-footer gave up the ghost about 20 years in? Re-balanced the torsion spring, ran it by muscle, waited five years 'til some other work was sorted.. THEN bolted-in the new 3/4 HP unit. Also 120 VAC.

You need input of a(nother) Canadian or Aussie from where they are not so paranoid about 600 Volt class goods on small garage doors.

CSA C22.1:21 Canadian Electrical Code, Part I (25th edition), Safety Standard for Electrical Installations

Yanks just class it daft and go for a piss.

Wish me luck?

Sometimes I forget the goal enroute.

:D
 

Just a Sparky

Hot Rolled
Joined
May 2, 2020
Thermite and his DC motor fetish. :rolleyes5:

Line reactors are typically used in series with non-linear loads like VFDs to normalize their current consumption. Less intense spiky pulsations of current, more of a smooth, proper sine wave. Line reactor is just a fancy term to describe an inductor intended for that particular use.

If simple enough, consider swapping the motors and control transformers for 120/240V single phase ones. Else Craigslist the 600V units and put the proceeds towards 120/240V ones. Any other solution will involve undue complexity and expense. You will not be able to obtain three phase power reliably from single phase without the use of a VFD, RPC or static phase converter, and the change in voltage will necessitate the use of a transformer. That's a lot of screwing around for a garage door opener or two.

Worth noting that VFDs, unlike static phase converters, are not intended for D.O.L. starting of motors and may not work for your application. You will also need to oversize them so as not to overload the input stage using a single phase source. Or use an external rectifier and supply it via DC link terminals if so equipped.
 

thermite

Diamond
Thermite and his DC motor fetish. :rolleyes5:

Not me. I just use what is cheap, cheerful, and proven fit for a purpose.

It's those people who actually make.. would you believe it?

"garage door openers".. of the "wall mount" persuasion, yet:

Bolt-in part swap, even?

041D1624-2 | DC Motor, 12V, RJO | Parts | LiftMaster

There are others in the Liftmaster line. And not-only:

BEMONOC Garage Door Motor 12V DC Right Angle Reversible Electric Gear Motor 45 RPM High Torque - - Amazon.com

Some makers even explain WHY DC is preferred:

Understanding AC and DC Garage Door Operators | Linear

Transformers? VFD? One VFD per door? 575 VOLTS? That's Nucking Futs!

I don't think I wanna KNOW what sort of Engineering cluster f**k you lot would create if he had asked about something complicated..

... such as a dual-mount bumfodder roll-holder for the loo...

...with afterburner ("re-heat" to you Brits..)

..and RATO.

Fat Albert "JATO" Take-Off 2009 - YouTube

:D
 

amoniave

Aluminum
Joined
Jan 28, 2012
Location
Canada
Thanks for all the input guys. I was decided on just selling these and picking up a cpl Liftmaster 8500w's, but after looking into them, the speed seems a little slow, guessing because direct drive.

So I may swap in a cpl 115v transformers and 230v single phase mtrs and make use of these, not 100% sure yet, but it will be one or the other ;)
 

thermite

Diamond
Thanks for all the input guys. I was decided on just selling these and picking up a cpl Liftmaster 8500w's, but after looking into them, the speed seems a little slow, guessing because direct drive.

So I may swap in a cpl 115v transformers and 230v single phase mtrs and make use of these, not 100% sure yet, but it will be one or the other ;)

Any major-maker will have motors for whatever you HAVE. 115-130 VAC OR 220-250 VAC, single-phase as well as more than one Voltage of 3-Phase and 12 V motors - probably 24 V DC as well.

Look around. It is all part of what they do to make the door itself easier to sell.

Can't have a slow rollup action on a door.

Got impatient and just walked ahead at one once. Caught me just above the eyebrows. Knocked me flat on my a**.

Not one to fly into a rage. Took my time. Hunted up a short-handled "hand drilling hammer".

Positioned the door to the same height. Took a swing. Put a sort of octagonal dimple in the lower edge. Door didn't seem to take any other notice. Go figure.

But I FELT better.

I mean.. given it was a manual roll-up, not powered?
I was the "too slow" opener.

Just didn't see the point of hitting myself in the head TWICE!
Bright for my age?

Well.. maybe not so much? You'd have to know 15 year-olds?

Sometimes we just flat-out MISS the chance to leave home and rule the world while we are still young enough know everything.
 








 
Top