I have seen the following patent online.
And I was wandering how that motor works. It seems that the vector of the cross sectional area of the coil is parallel to the vector of the rotation of the magnet. From a basic physical understanding that I have, it seems that the coil cross section cuts through the same amoung of flux regardless of the rotation of the magnet. If so how does the magnet keeps rotating and does not just align itself to the magnetic field of the coil?
On the left side of the picture we can see the rotor that has a magnet embedded in it. On the right side of we can see the coil windings. The rotor pin is inserted in the bore that is created through the coil in a way that the magnet can be rotated with the coil inside it remaining stationary (imagine that the coil is mounted in a bigger structure). The four plates that sandwitch the coil are iron plates but are not in contact with the coil (since the coil is electrically insulated by its plastic mount) or the magnet.