Permanent Magnet for Motor 20170309-2
Permanent Magnet for Motor 20170309-2
The Smallest Motor in the World: Copper + Battery + Neodymium Permanent Magnets
When electrons move in the magnetic field, there will be a force to them that perpendicular to the field direction and the moving direction at the same time, namely Lorentz Force. And the smallest acyclic motor just lies on this force.
The red closed lines in the drawing are magnetic induction line, which describes the magnetic field distribution of neodymium permanent magnet on some cross section. Among them, the tangent line on each point represents its magnetic flux density. The blue arrow points to the direction of current that from positive to negative by copper wire. And according to Left-hand rule, it can be judged that the forced direction in the magnetic field, which showed by green marks in the drawing. The mark “⊙” shows the direction face to the reader, and the mark “×” back to the reader. Observed carefully, the left marks are all “×”, and right are “⊙”. Therefore, in this way, the copper can rotate, which is just the smallest motor.
Particularly, when put the battery or permanent magnet upside down, the copper will rotate in opposite direction. But if the battery and magnet are reversed at the same time, there will be no changes.
The Smallest Motor in the World: Copper + Battery + Neodymium Permanent Magnets
When electrons move in the magnetic field, there will be a force to them that perpendicular to the field direction and the moving direction at the same time, namely Lorentz Force. And the smallest acyclic motor just lies on this force.
The red closed lines in the drawing are magnetic induction line, which describes the magnetic field distribution of neodymium permanent magnet on some cross section. Among them, the tangent line on each point represents its magnetic flux density. The blue arrow points to the direction of current that from positive to negative by copper wire. And according to Left-hand rule, it can be judged that the forced direction in the magnetic field, which showed by green marks in the drawing. The mark “⊙” shows the direction face to the reader, and the mark “×” back to the reader. Observed carefully, the left marks are all “×”, and right are “⊙”. Therefore, in this way, the copper can rotate, which is just the smallest motor.
Particularly, when put the battery or permanent magnet upside down, the copper will rotate in opposite direction. But if the battery and magnet are reversed at the same time, there will be no changes.
