- Ball bearing motor
A ball bearing motor is an unusual
electric motorthat consists of two ball-bearing-type bearings, with the inner races mounted on a common conductive shaft, and the outer races connected to a high current, low voltage power supply. An alternative construction fits the outer races inside a metal tube, while the inner races are mounted on a shaft with a non-conductive section (e.g. two sleeves on an insulating rod). This method has the advantage that the tube will act as a flywheel. The direction of rotation is determined by the initial spin which is usually required to get it going.
S. Marinov suggests that the device produces motion from electricity without magnetism being involved, operating purely by thermal means.cite web | url=http://www.electricstuff.co.uk/Bbmotor.Html| author=Mike Harrison|title=The Ball-Bearing electric motor| accessdate=2006-10-08] The same explanation is given by Watson, Patel and Sedcole for rotating cylinders (instead of balls).D. B. Watson, S. M. Patel, N. P. Sedcole. Ball-bearing motor effect with rolling cylinders. IEE Proc.-Sci. M eas. Technol., Vol. 146, No. 2, March 1999. [http://forseti.grainger.uiuc.edu/~iee/SMT/146_02/990289/99028900.pdf] ] However, H. Gruenberg has given a thorough theoretical explanation based on pure electromagnetism (and neglecting the thermal effects completely).H. Gruenberg. The ball bearing as a motor. American Journal of Physics, Dec. 1978, Vol. 46, Issue 12, pp. 1213-1219. [http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=AJPIAS000046000012001213000001&idtype=cvips&gifs=yes] ] Also, P. Hatzikonstantinou and P. G. Moyssides claim to have found an excellent agreement between the results from the electromagnetic theory and the experiments measuring the total power and efficiency of the motor.P. Hatzikonstantinou, P. G. Moyssides. Explanation of the ball bearing motor and exact solutions of the related Maxwell equations. Journal of Physics A: Mathematical and General, Volume 23, Issue 14, pp. 3183-3197 (1990). [http://www.iop.org/EJ/abstract/0305-4470/23/14/017] [http://adsabs.harvard.edu/abs/1990JPhA...23.3183H] ]
This motor could also be described as a concentric rail gun.
Other similar effects:
Homopolar generator Homopolar motor Faraday Paradox
* [http://www.electricstuff.co.uk/Bbmotor.Html The Ball-Bearing electric motor]
Wikimedia Foundation. 2010.
Look at other dictionaries:
Bearing (mechanical) — A bearing is a device to allow constrained relative motion between two or more parts, typically rotation or linear movement. Bearings may be classified broadly according to the motions they allow and according to their principle of operation as… … Wikipedia
Ball screw — A ball screw is a mechanical device for translating rotational motion to linear motion. A threaded shaft provides a spiral raceway for ball bearings which act as a precision screw. As well as being able to apply or withstand high thrust loads… … Wikipedia
Motor controller — A motor controller is a device or group of devices that serves to govern in some predetermined manner the performance of an electric motor. A motor controller might include a manual or automatic means for starting and stopping the motor,… … Wikipedia
DC motor — A DC motor is an electric motor that runs on direct current (DC) electricity. Contents 1 Brush 2 Brushless 3 Uncommutated 4 Connection types … Wikipedia
Electric motor — For other kinds of motors, see motor (disambiguation). For a railroad electric engine, see electric locomotive. Various electric motors. A 9 volt PP3 transistor battery is in the center foreground for size comparison. An electric motor converts… … Wikipedia
Thrust bearing — A thrust bearing is a particular type of rotary bearing. Like other rotary bearings they permit rotation between parts, but they are designed to support a high axial load while doing this.Thrust bearings come in several varieties. * Ball thrust… … Wikipedia
Fluid bearing — Fluid bearings are bearings which solely support the bearing s loads on a thin layer of liquid or gas.They can be broadly classified as fluid dynamic bearings, hydrostatic or gas bearings. They are frequently used in high load, high speed or high … Wikipedia
Mendocino motor — The Mendocino motor is a solar powered magnetically levitated electric motor. Contents 1 Description … Wikipedia
Rod end bearing — A rod end bearing, also known as a heim joint (N. America) or rose joint (U.K. and elsewhere), is a mechanical articulating joint. Such joints are used on the ends of control rods, steering links, tie rods, or anywhere a precision articulating… … Wikipedia
Brushless DC electric motor — A microprocessor controlled BLDC motor powering a micro remote controlled airplane. This external rotor motor weighs 5 grams, consumes approximately 11 watts (15 millihorsepower) and produces thrust of more than twice the weight of the plane … Wikipedia