A strange electric motor

Here there are no windings, magnetic fields, magnets, brushes,

but only two bearings connected by a conductor axis.

In this motor the current flows through the first bearing, the axis

conductor and then the second bearing. The electrical contacts

are applied to the outer rings of the bearings. PROPERTIES:

1. the engine must be started.
2. the motor rotates in either direction.
3. the engine is running both direct current and alternating current.

The power is approximately 3-5 Volts with very strong curre.

(this is basically a short circuit)

"Ball bearing Motor" the current passes through inner race of one side ball bearing , then to the shaft , outer race of other ball bearing , then to inner race , causes a temporally expansion of each ball , deforms it to elliptical and adds pressure between inner & outer race then cause a moment of rotation , for that reason , it needs a prime movement to sustain rotation , by the way it doesn't matter whether the current is DC or AC , it just used to heat up the balls.

https://youtu.be/tb2GUiV8Bf0

http://www.physics.princeton.edu/~mcdonald/examples/motor.pdf