430.250--115v 3phase motor voltage rating?
- Thread starter ibew441dc
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chris kennedy
Senior Member
- Location
- Miami Fla.
- Occupation
- 60 yr old tool twisting electrician
chris kennedy
Senior Member
- Location
- Miami Fla.
- Occupation
- 60 yr old tool twisting electrician
Bump, because I would love to see that also.
ibew441dc
Senior Member
.............a link or a manufacturer would also be helpful.
I've searched a few of the major manufactures and came up with nothing (ie. Baldor and GE) I figured if anyone would have it they should. My next step was electronics , nothing there either.
ohmhead
Senior Member
- Location
- ORLANDO FLA
Well there is a motor thats three phase 120 volt .
actual voltage can be 110 volt 120 volt !
and 230 or 208 v actually any voltage in design .
Its called a STEROMOTOR this can be a multi voltage motor and its also the only motor that can be asychronus or sychronus .
application for these power plants , flow valves we had them in the navy .take care best to yas
ibew441dc
Senior Member
Who makes it, and where can I get info on it? Its harder to track down than BigFoot. I googled steromotor and theres not much help.
ohmhead
Senior Member
- Location
- ORLANDO FLA
Well I have no clue to were or how to purchase one but they are made and not you everyday off the shelf deal at the local supply house . Sorry we can not help you in that dept. There used for fluid pumps non vibration type of motor specialty application very low speed but lots of torque . take care good luck
ibew441dc
Senior Member
:-?I've looked all over the place online, and even asked some distributors ......I'm starting to think that its the NFPA's way of screwing with electricians who poke around in the code to much:-?.
Its kinda like when you have a 1st year apprentice on the job and you tell them to get you a left handed screw driver or a wire stretcher
:wink: So far they got me good......When Chris Kennedy brought up article 647, .....I thought man! now were cookin with grease........other than a claim by Ohmhead I think a 115 volt 3 phase motor is like trying to find LOch Ness.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
Darn it! If this motor exists I'm gonna find it!! Since this thread started I have already spent three hours searching and I aint giving up!!!
glene77is
Senior Member
- Location
- Memphis, TN
In 1959, my first (and best ever 'boss') sent me for a wire stretcher.
I brought back a conduit bender,
and explained how he could stretch the wire.
After that, we were on best terms.
( I had a full Ham license when I was 14,
and knew that only fence installers used 'wire stretchers',
which are hand-held winch things.
Electricians might use them for 'pulling' wire in conduits.)
:smile:
Last edited:
ohmhead
Senior Member
- Location
- ORLANDO FLA
Well they are real ,but you may never see one unless your application is gas and liquid valve regulation .position control of vent flaps stop cocks wire and cable reelers cutting machines or nuclear reactor equipment tool heads torque machine heads valves non vibration type ?
Standard Steromotors operate from single phase two phase or three phase supplies as well a dc pulsed dc supplies and can provide a stepping action or a constant low speed at high torque type motor ,both asynchronous and sycnchronous versions are made.
Electrically the steromotor is a conventional ac motor but mechanically it has an ususual design feature in that a permanent magnet rotor is free to roll round inside of the stator bore without the usual restraint of bearings on a fixed axis .
Meaning there is no metal to metal contact of the rotor and the stator as the rotor is fitted with two resilient tyres at each end which run in the annular tracks in the stator . The stationary stator coils are arranged to produce a rotating magnetic field .
This specially constructed magnet rotor having no fixed axis is allowed to roll freely in the stator bore and to align itself with instantaneous magnetic flux .
the permanent magnet field and ac rotating field in the steromotor .
As the field moves round ,so the rotor follows the rotor movement results in slow output shaft rotation which is by construction of parameters of the steromotor special rotor and stator . just a few words from a book called Electric Motor Mcgraw & Hill these are rare motors . You will not find these at the any motor supply company these are specialty motors rare .ive seen twice in my time which is lots of years in the trade . comments take care
Standard Steromotors operate from single phase two phase or three phase supplies as well a dc pulsed dc supplies and can provide a stepping action or a constant low speed at high torque type motor ,both asynchronous and sycnchronous versions are made.
Electrically the steromotor is a conventional ac motor but mechanically it has an ususual design feature in that a permanent magnet rotor is free to roll round inside of the stator bore without the usual restraint of bearings on a fixed axis .
Meaning there is no metal to metal contact of the rotor and the stator as the rotor is fitted with two resilient tyres at each end which run in the annular tracks in the stator . The stationary stator coils are arranged to produce a rotating magnetic field .
This specially constructed magnet rotor having no fixed axis is allowed to roll freely in the stator bore and to align itself with instantaneous magnetic flux .
the permanent magnet field and ac rotating field in the steromotor .
As the field moves round ,so the rotor follows the rotor movement results in slow output shaft rotation which is by construction of parameters of the steromotor special rotor and stator . just a few words from a book called Electric Motor Mcgraw & Hill these are rare motors . You will not find these at the any motor supply company these are specialty motors rare .ive seen twice in my time which is lots of years in the trade . comments take care
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Ohm, it almost sounds like you're describing an electromagnetic version of an automotive torque converter.
ohmhead
Senior Member
- Location
- ORLANDO FLA
Well they have a list of characteristics
1) high torque at low speed without gears
2)no commutator ,slip rings or brushes
3)no high speed bearings and no lubrication
4)continuous operation under stalled conditions
5)negligible rotor inertia
6)reversibility of rotation in seconds
7)high positional accuracy in synchronous operation
8)inherent braking torque without energization there is no overun .
This type of motor is also referred to as a hypocycloidal motor so named because a point on the rotor surface moves along hypocycloidal trajectoies . it can also have a dc field in the rotor hence a permanet magnet rotor is not required at times or types of steromotors .
This maybe common in other types of motors Larry iam not a expert on this just at little from a page in my motor books on this type . iam trying to find a picture of one but none to be found in this book just lots of motor theory . best to yas
1) high torque at low speed without gears
2)no commutator ,slip rings or brushes
3)no high speed bearings and no lubrication
4)continuous operation under stalled conditions
5)negligible rotor inertia
6)reversibility of rotation in seconds
7)high positional accuracy in synchronous operation
8)inherent braking torque without energization there is no overun .
This type of motor is also referred to as a hypocycloidal motor so named because a point on the rotor surface moves along hypocycloidal trajectoies . it can also have a dc field in the rotor hence a permanet magnet rotor is not required at times or types of steromotors .
This maybe common in other types of motors Larry iam not a expert on this just at little from a page in my motor books on this type . iam trying to find a picture of one but none to be found in this book just lots of motor theory . best to yas
ibew441dc
Senior Member
I am amazed that there is not a single person on this forum that can provide a real life picture, referral, and/or part # of a 115 volt 3 phase motor.
Some may be wondering.....Whats the big deal? Who cares about a 115 volt 3 phase motor?
Well I do , and I think many here are curious also. What the heck is it doing on that table? Ohmhead gives a plausible example.....but I want to see it.
The cool thing about this is that I've dug through all kinds of cool motor stuff that I may not have(NEMA stuff,misc catalogs,distributors).
I hope this thread does not fade away. The NEC has it in a table, NEMA recognizes it as a motor rating...........It's gotta be out there somewhere.
What is the code panel that covers motors? Who knows somebody on it?
Some may be wondering.....Whats the big deal? Who cares about a 115 volt 3 phase motor?
Well I do , and I think many here are curious also. What the heck is it doing on that table? Ohmhead gives a plausible example.....but I want to see it.
The cool thing about this is that I've dug through all kinds of cool motor stuff that I may not have(NEMA stuff,misc catalogs,distributors).
I hope this thread does not fade away. The NEC has it in a table, NEMA recognizes it as a motor rating...........It's gotta be out there somewhere.
What is the code panel that covers motors? Who knows somebody on it?
ohmhead
Senior Member
- Location
- ORLANDO FLA
Well ill find a picture just need to be able to download it from the us patent office now older patents are hard to locate and download stuff .
But in the book the Steromotor was invented by two french engineers the first of these motors at the Paris Messutcora exhibition 1961 and production in 1962. there names were M. C. Rosarn & M. G. Stcherbetcheff
If they have a patent in the us ill find it ?
Well be able to find it if not its the French patent process which is lots of fun to find or locate .
The book iam looking at is a McGarw -Hill book company called ELECTRIC MOTOR HANDBOOK it is not a electricians type book its for electrical engineers design and construction of motors copyright 1978 its from the UK and printed in Great Britain .take care best to ya
But in the book the Steromotor was invented by two french engineers the first of these motors at the Paris Messutcora exhibition 1961 and production in 1962. there names were M. C. Rosarn & M. G. Stcherbetcheff
If they have a patent in the us ill find it ?
Well be able to find it if not its the French patent process which is lots of fun to find or locate .
The book iam looking at is a McGarw -Hill book company called ELECTRIC MOTOR HANDBOOK it is not a electricians type book its for electrical engineers design and construction of motors copyright 1978 its from the UK and printed in Great Britain .take care best to ya
mivey
Senior Member
I would think it is not so much identifying a specific 115v 3-ph system, but rather the general range 110 to 120 volts (like the 230 volt column for 220-240v, the 460v column for 440-480v, and the 575v column for 550-600v).
We have seen 110 & 220, 115 & 230, 120 & 240, etc, volt references over the years.
We have seen 110 & 220, 115 & 230, 120 & 240, etc, volt references over the years.
ibew441dc
Senior Member
Nobody is trying to find the 3 phase system.....that's the easy part (one spot is in section 647.5)
mivey
Senior Member
I guess I'm just not following the thread. I'll check in later and see if it makes more sense. Maybe I need a lunch break.
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