Stefan Marinov ball bearing DC/AC motor.MOV

How does it work ?
When current passes from the outer ring of the ballrace to the inner ring via each ball, heat is generated at the point of contact due to the increased resistance. This localised heating causes the ball to expand in the hot area, causing a slight elongation of the ball, pushing against the inner and outer rings of the race. If the ball were stationary, this would cause the bearing to stiffen and sieze up, but when it's rotating (from the initial spin), this elongation causes the ball to push itself further round in the direction of rotation, sustaining the movement. This action happens as a continuous process on all the balls which are in electrical contact with the inner and outer rings.
How do I run it?
To run the motor, first ensure the shaft rotates freely and smoothly. Arrange the electrical connections so you can connect and (especially) disconnect the supply very quickly. Holding one of the wires onto the transformer/battery terminal satisfies the quick-disconnect criterion, but be VERY careful not to burn yourself - holding the connection in pliers is a good move.
Give the motor a hand-spin, then connect the supply while the shaft is still turning. You should see (and hear) the shaft accelerate as soon as power is applied, possibly accompanied by a few sparks, and almost certainly a smell of 'hot metal'. Don't run the motor for more than a few seconds at a time, and if it doesn't start immediately, remove the power quickly to prevent siezing. The motor will reach its maximum speed fairly quickly (depending on the flywheel size), and then start to slow as the bearings heat up and start to sieze..

Category:

Science & Technology

Tags:

• Stefan
• Marinov

[theonethatgoofs]

did you know that if you put 1 bearing on each end of a bolt and put power to the bearings the bolt will spin in the bearings no copper windings no magnet.magnets and copper windings are not needed in a electric motor

[madsatbg]

@theonethatgoofs

yes, you're right



[madsatbg]

Hi,

I do not know whether there an industrial model, Stefan Marinov but has produced several models. More can be found here:

electricstuff-co-uk/bbmotor-ht­­ml

replace minus with points

[ZincFold]

Very interesting. What practical uses does a motor like this have? Is this concept already being used else where? Thanks for sharing. Cheers