7. Movable loads equipped with annular magnets

Consider the Fig. 6

Rotor with 

movable loads
Fig. 6

Here two disks with cylindrical loads are rotated so that the observer sees only those loads which have been shifted along the inclined paths to the minimum possible distance from the axis of rotation of disks, i.e., sees the loads which are located into the space that corresponds to the sectors a12 - O - a16 and a1 - O - a3 (Fig. 2). The loads are equipped with radially magnetized ring shaped magnets, the outer surface of which conditionally painted in one colour (red) to show the coincidence of the poles of the magnetization of these surfaces.

The cylindrical loads are performed in two alternating varieties. “The working length” of the cylindrical load is constructively restricted by the accepted distance between two disks. As can be seen in Fig. 6, the annular magnets utilize such length of the load only partially. The disposition of the annular magnets along the whole “Working length” of each cylindrical load, that is, the use only of identical loads is impossible, because, in such case, the annular magnets of the loads would be too close to each other, during their moving into the sectors a12 - O - a16 and a1 - O - a3 (Fig. 2). In such a state they must repel each other. It would cause decrease in engine efficiency and, under certain conditions, would reduce the duration of preservation the magnetization of the annular magnets. The number of magnetic rings on the “Working length” of the adjacent cylindrical loads can be greater: 3 and 2, 4 and 3, 5 and 4, and so on. It is only important that the rings must be placed in each of the varieties of loads symmetrically with respect to the conditional plane located midway between the disks and perpendicular to the axis of rotation of the disks, i.e., that the force impact of each load on rotation of each of the disks, which form a pair, must be equally distributed between the disks. However, increasing the number of rings is not desirable, because with a decrease in the lengths of the magnetic rings relative to the size of their outside diameters the distortions of fields at the ends of the ring magnets will have more affect.

The design of the cylindrical load with two annular magnets is shown in Figure 7.

Movable loads
Fig. 7

Here you can see that each cylindrical load includes in addition of ring magnets a “filler”, a metal rod that holds the entire device, and two wheels. Magnetic properties of the "filler" must be very weak, in particular, it can be made from materials that are characterized as weak diamagnetic[8]. The load with a single ring magnet (of double length) has a similar structure. Since the torque generated by each individual load, due to impact of gravitation, is directly proportional to its weight, it is desirable that all components incoming into the load were manufactured from the materials having the highest specific weights.

In Figure 7 the ring magnets conditionally painted in two colours to show the difference between the poles of the magnets on their inner and outer surfaces. The possibility of radial magnetization of the ring magnets is confirmed by the advertising messages of numerous companies which produce permanent magnets. Perhaps it will be possible applying of the ring magnets, such as “Halbach cylinder”[9], [10], which are already utilized in practice. “Halbach cylinder” is a magnetized cylinder composed of ferromagnetic materials in such a way[11], that it may produce (in the idealized case) an intense magnetic field confined entirely by chosen direction of magnetization. Cylinders of this type can be magnetized such that the magnetic field will be entirely outside the cylinder, with zero field inside. Thereto, the external magnetic field formed by ring magnets of this type may be much stronger than the field due to the usual ring magnets with radial magnetization.

This page was last modified on 18 September 2014