It I not possible to make a permanent magnet bearing that is completely stable so they use electromagnets for active damping. Most of the work is done with normal magnets tho.
@Jack Saami thanks for the link. The concept I was talking about is called earnshaws theorem and it's a little bit complicated. If you go to the end of the video you'll notice that the shaft bounces around and never reaches a perfectly stable equilibrium. When modeling magnets we draw out a plane and for each point in that plane we calculate the magnitude and direction of the force exerted by the magnet. This is called a vector field. when a magnetic object (ie. the shaft of our bearing) is put into this vector field, it gets pushed by the vector in it's location. A couple features of vector fields: A "sink" is a place where the vectors all point to one place. Think of it as a drain in a bathtub -- the flow of water from all directions points in. This is the only way to have a perfectly stable system. All the force vectors keep the object in the same place. A "source" is a point where all of the surrounding vectors point away from it. Think of dumping a bucket of water out into your bathtub. At The point where the water lands, water flows away in every direction. A "saddle" is where some vectors point in to a point and other vectors point out of it. Think of the slope on a saddle. From the sides the surface is sloped down but from the front and back it is sloped up. Finally: Magnetic fields have the property that the field lines start at one pole and do not cross before reaching the other pole. They also never end before reaching the other pole. (The magnetic field lines are the lines you see when you Google a diagram of a magnet. They follow the vectors in the vector field of forces.) This means that magnets have a source at one pole and a sink at the other pole. Since the field lines cannot cross or end, the vectors cannot make a new sink (a stable position), only saddles (some forces pointing in, some forces pointing out). Saddles cannot make a stable position because they have a force vector pointing out that dislodges the object. What we see with the video you sent is the object moving between several saddles. It is almost stable at one saddle, then it drifts off and gains momentum, then it moves to another saddle, then another, then another. We know it will never be completely stable because it is impossible to make a sink. The only sink is at the pole of the permanent magnet ( which means stuck to it). The way active magnetic bearings work is they sense when the shaft starts moving out of a saddle and then an electromagnet is turned on that pushes the shaft back into the saddle. This is very efficient because the forces near saddles are usually very small. There are a lot of exceptions to this rule, but none of them apply to household magnets. The Wikipedia page is pretty cool, I suggest reading it. en.m.wikipedia.org/wiki/Earnshaw%27s_theorem
Magnetic bearings are the frictionless bearing but using newer Technologies with neodymium magnets and electromagnets and #ferrofluid is what I've been looking for.
What exactly are you looking for? And why? I think you might be anticipating or predicting something. Either way, my interest is peaked especially as I notice there were 26 comments on this video.
@@marshmoreland8365 I modified my magnetic bearing by removing every other coil and replacing it with neodymium bar magnets and using #ferrofluid to dampens wobble and straightens driveshaft so it generates electricity instead of using electricity & still functions the same. On my (#Teslaturbine) there's two magnetic bearings now the one I modified Powers the other magnetic bearing. The Tesla turbine parts are Nano reinforced with aluminum oxide powder and graphite powder that has been sitting in ultrasonic bath with chemical to doped graphite a single carbon atom sprayed out of powder coating gun & then pressure oven-baked creating a hard transparent aluminum diamond coating.
@@marshmoreland8365 me too right now I've got a 3D model I've been AI testing and tweaking in the meantime I have the rest of the part out to powder coat and I been to purchasing some more material. soon.
Bei kleinen maschinen kostet die wartung eh nichts, weswegen ich mir diese lager eher nur in der großindustrie vorstellen kann. Und in der großindustrie findet man nun eben mal größere wellen, deswegen mich echt mal interessieren würde wie viel kw/kg diese magneten für das tragen einer welle benötigen. In deutschland würde allein ein 1kw magnet der 24h jeden tag läuft bei 0,35€/kWh 3000€ im jahr kosten. Bin mir sicher dass wartung günstiger ist. Wofür werden diese magnetic bearings denn eingesetzt?
Please, I am from Egypt and have been searching for a long time for a ball bearing or something similar to install it for a handmade body that rotates at a speed of one million revolutions per minute without being subjected to corrosion or something that works with electromagnetism. Please, is it possible for me to find something like this? Thank you
Search for "air bearing". I am not a mechanical engineer but I think it is the only feasible option for that kind of speed. Though I am sure that it would be super hard to somehow find and integrate your "handmade" system.
Did you ever figure this out? I would need to know more specifications like the weight introduced on the drive shaft and the load introduced on driveshaft.
@@eaatgmbh6952 Let's say for a small vehicle like the old Geo Metro hatchback cars. In the mid 1990s, those cars had v3 engines. Would that be possible? I wonder.
@@tempstep4058 In principle it is possible, but the internal combustion engine is certainly not suitable for this. In addition, this solution is currently becoming unaffordable. For a magnetic bearing you need an additional electrical energy source and the associated controller unit, as well as a corresponding electrical energy source. The main question, however, is where the bearing is to be installed, the installation space of the mechanical bearings will not be enough.
@@eaatgmbh6952 I see. It's probably more for an engine design of its own, who knows. If we manage a way to fit it in a more usable environment and places, who knows, the affordability might change. I was thinking where the shaft meets the block at the two ends, I'd replace the bearings with magnetic, but perhaps for a compressed air powered vehicle than one that has to deal with oil too much.
@@tempstep4058 It is both not practical or needed in a crankshaft application. Hydraulic bearing technology has been around for at least 70 years. The curved pieces of different metal [bearings] only touch the crankshaft surfaces on a film of oil when the engine is not running. Once the engine is started and develops oil pressure, a hydraulic cushion of oil pushes the bearing away from from the crankshaft surfaces. The engine oil actually acts as a liquid bearing.
NEW ERA : MAGNET = MOTOR SEM : BEARINGS ; NEW PROJET ; NEW MODEL ; OF FUTURE ; HOJE : APLICAÇÕES !!!! MÚLTIPLAS !!! INOVAÇÃO ; TECNOLOGY ; FUTURE DESCOBERTA ; INOVADORA ; REVOLÚCIONÁRIA ; PROJET ; LAY-OUT ; FUTURE ; APLICAÇÕES : FUNCIONAMENTOS !!!??? 😯😲🤔😯😲🤔😲🤔😄😀😮😄😀👍👍🌏🌎🌍👏👏👏👏👏👏👏👏👏👏👏👏
"Get to the choppa!"
man the levitation of magnets is so cool
So do you use non metalic shafts or in confused. There might not be friction but there would be lorenz forces
This is electromagnetic bearing, not magnetic bearing.
It I not possible to make a permanent magnet bearing that is completely stable so they use electromagnets for active damping. Most of the work is done with normal magnets tho.
@Jack Saami thanks for the link.
The concept I was talking about is called earnshaws theorem and it's a little bit complicated. If you go to the end of the video you'll notice that the shaft bounces around and never reaches a perfectly stable equilibrium.
When modeling magnets we draw out a plane and for each point in that plane we calculate the magnitude and direction of the force exerted by the magnet. This is called a vector field. when a magnetic object (ie. the shaft of our bearing) is put into this vector field, it gets pushed by the vector in it's location.
A couple features of vector fields:
A "sink" is a place where the vectors all point to one place. Think of it as a drain in a bathtub -- the flow of water from all directions points in. This is the only way to have a perfectly stable system. All the force vectors keep the object in the same place.
A "source" is a point where all of the surrounding vectors point away from it. Think of dumping a bucket of water out into your bathtub. At The point where the water lands, water flows away in every direction.
A "saddle" is where some vectors point in to a point and other vectors point out of it. Think of the slope on a saddle. From the sides the surface is sloped down but from the front and back it is sloped up.
Finally:
Magnetic fields have the property that the field lines start at one pole and do not cross before reaching the other pole. They also never end before reaching the other pole. (The magnetic field lines are the lines you see when you Google a diagram of a magnet. They follow the vectors in the vector field of forces.) This means that magnets have a source at one pole and a sink at the other pole. Since the field lines cannot cross or end, the vectors cannot make a new sink (a stable position), only saddles (some forces pointing in, some forces pointing out).
Saddles cannot make a stable position because they have a force vector pointing out that dislodges the object. What we see with the video you sent is the object moving between several saddles. It is almost stable at one saddle, then it drifts off and gains momentum, then it moves to another saddle, then another, then another. We know it will never be completely stable because it is impossible to make a sink. The only sink is at the pole of the permanent magnet ( which means stuck to it).
The way active magnetic bearings work is they sense when the shaft starts moving out of a saddle and then an electromagnet is turned on that pushes the shaft back into the saddle. This is very efficient because the forces near saddles are usually very small.
There are a lot of exceptions to this rule, but none of them apply to household magnets.
The Wikipedia page is pretty cool, I suggest reading it.
en.m.wikipedia.org/wiki/Earnshaw%27s_theorem
전기를 어떻게 넣어야 하는거죠?
Could you make a rotary engine out if magnetic bearings?
Magnetic bearings are the frictionless bearing but using newer Technologies with neodymium magnets and electromagnets and #ferrofluid is what I've been looking for.
What exactly are you looking for? And why? I think you might be anticipating or predicting something. Either way, my interest is peaked especially as I notice there were 26 comments on this video.
*only 26 comments! Unbelievable
@@marshmoreland8365 I modified my magnetic bearing by removing every other coil and replacing it with neodymium bar magnets and using #ferrofluid to dampens wobble and straightens driveshaft so it generates electricity instead of using electricity & still functions the same. On my (#Teslaturbine) there's two magnetic bearings now the one I modified Powers the other magnetic bearing. The Tesla turbine parts are Nano reinforced with aluminum oxide powder and graphite powder that has been sitting in ultrasonic bath with chemical to doped graphite a single carbon atom sprayed out of powder coating gun & then pressure oven-baked creating a hard transparent aluminum diamond coating.
@@travman2863 I'd like to see that
@@marshmoreland8365 me too right now I've got a 3D model I've been AI testing and tweaking in the meantime I have the rest of the part out to powder coat and I been to purchasing some more material. soon.
can we use this on jet engines?
NASA has a report about their possible use in gas turbine engines.
ntrs.nasa.gov/api/citations/20040110826/downloads/20040110826.pdf
You ever find out?
Bei kleinen maschinen kostet die wartung eh nichts, weswegen ich mir diese lager eher nur in der großindustrie vorstellen kann. Und in der großindustrie findet man nun eben mal größere wellen, deswegen mich echt mal interessieren würde wie viel kw/kg diese magneten für das tragen einer welle benötigen. In deutschland würde allein ein 1kw magnet der 24h jeden tag läuft bei 0,35€/kWh 3000€ im jahr kosten. Bin mir sicher dass wartung günstiger ist.
Wofür werden diese magnetic bearings denn eingesetzt?
This video did not follow the title
It implies we should see more of how they are made, Not an advertisement as exactly what you did
yeah I wonder how they keep the inner bearing in place so that it's not shifting to the right and left
Please, I am from Egypt and have been searching for a long time for a ball bearing or something similar to install it for a handmade body that rotates at a speed of one million revolutions per minute without being subjected to corrosion or something that works with electromagnetism. Please, is it possible for me to find something like this? Thank you
Search for "air bearing". I am not a mechanical engineer but I think it is the only feasible option for that kind of speed. Though I am sure that it would be super hard to somehow find and integrate your "handmade" system.
@@isgadam شكرا لك أخي علي اضافتك
nothing solid can rotate at 1 million rpm without disintegrating.
Did you ever figure this out? I would need to know more specifications like the weight introduced on the drive shaft and the load introduced on driveshaft.
Do you make magnetic bearings for crankshafts?
Hey. It is theoretical possible, depends on the specifications.
@@eaatgmbh6952
Let's say for a small vehicle like the old Geo Metro hatchback cars. In the mid 1990s, those cars had v3 engines. Would that be possible? I wonder.
@@tempstep4058 In principle it is possible, but the internal combustion engine is certainly not suitable for this. In addition, this solution is currently becoming unaffordable.
For a magnetic bearing you need an additional electrical energy source and the associated controller unit, as well as a corresponding electrical energy source.
The main question, however, is where the bearing is to be installed, the installation space of the mechanical bearings will not be enough.
@@eaatgmbh6952
I see. It's probably more for an engine design of its own, who knows. If we manage a way to fit it in a more usable environment and places, who knows, the affordability might change. I was thinking where the shaft meets the block at the two ends, I'd replace the bearings with magnetic, but perhaps for a compressed air powered vehicle than one that has to deal with oil too much.
@@tempstep4058 It is both not practical or needed in a crankshaft application. Hydraulic bearing technology has been around for at least 70 years. The curved pieces of different metal [bearings] only touch the crankshaft surfaces on a film of oil when the engine is not running. Once the engine is started and develops oil pressure, a hydraulic cushion of oil pushes the bearing away from from the crankshaft surfaces. The engine oil actually acts as a liquid bearing.
skateboard?
Cost of m.b. image in thumb
Good!
Building better best bearing boldly
It slows the shaft minutely.
Attire
NEW ERA : MAGNET = MOTOR
SEM : BEARINGS ; NEW PROJET ;
NEW MODEL ; OF FUTURE ;
HOJE : APLICAÇÕES !!!! MÚLTIPLAS !!!
INOVAÇÃO ; TECNOLOGY ; FUTURE
DESCOBERTA ; INOVADORA ;
REVOLÚCIONÁRIA ; PROJET ; LAY-OUT ; FUTURE ; APLICAÇÕES :
FUNCIONAMENTOS !!!??? 😯😲🤔😯😲🤔😲🤔😄😀😮😄😀👍👍🌏🌎🌍👏👏👏👏👏👏👏👏👏👏👏👏
Das funktioniert so nicht.🤔👎