Magnetic Repulsion Experiment by Norman Bollinger
or Download the movie here
Click photo for larger image !
Description of the above movie: This is like Lafonte's fixture video. But I take it a step further and show how to unbalance the magnetic scissors.
Apparatus description The magnets on the left are opposites facing therefore attracting. The magnets on the right are like poles facing thereby repelling. Thereby giving a balanced magnetic apparatus. Now we will demonstrate how to unbalance them and make them move.
I. First is shown that there are magnets that are balanced and do not attracted or repel.
II. Then I take a portion of a hacksaw blade and put it behind the left side magnet and it unbalances the scissors such that the left side now attracts its near magnet.
III. Then I place the iron behind the magnet on the right side and you see that it is off magnetically balanced and repels, pushing away from its near magnet. So magnets can have their magnetic forces changed by redirecting its forces in some way. In this case we use iron to do that. As you know horseshoe magnets are often sold with a keeper which short circuits the magnetic fields from going out into the air to going through the keeper/iron and thus having less magnetic force available through its normal air/path. If you have been studying magnets you may know about the Echlin motor/generator stuff that rotates an iron bar past magnets with coils thereby making electricity by changing the magnetic forces as we have seen in this apparatus.
Ecklin Patent number 3,879,622
A permanent magnet motor in one embodiment utilizes a spring-biased reciprocating metal member positioned between two permanent magnets. Magnetic shields in the form of rotatable shutters are located between each permanent magnet and the reciprocating member to alternately shield and expose the member to the magnetic field thereby producing reciprocating motion. A second embodiment utilizes a pair of reciprocating spring-biased permanent magnets with adjacent like magnetic poles separated by a magnetic shield which alternately exposes and shields the like poles from the repelling forces of their magnetic fields.