The first dimension to be determined is the height of the magnet, which will then be the entire length of the rotor, with a clearance of 2.05 mm at the end. The second dimension of the magnet is its thickness which must be pointed so that the maximum current that can be supplied by the converter will not demagnetize the magnets in the rotor 10hp 215tc motors. Induction in the air gap is directly proportional to the remaining induction and magnet area. As the remaining induction is a characteristic of the magnet, attention turns to the dimension of the magnet.
The buried magnets must take special care to avoid that the flow does not find a way to go from the north pole to the south pole without passing through the air gap of the electric motor, an axis in non-ferromagnetic material is essential. Another option to consider is the use of a ferromagnetic axis covered by a layer of non-ferromagnetic material. This second option will reduce the cost of the shaft, but it raises the manufacturing cost because it increases the number of assembly components. In order to reduce the dispersed flux, the magnets will be leaning against the non-ferromagnetic axis, there being no path in the center of the rotor for the flow to disperse.