SU546959A1 - Magnetic system - Google Patents

Description

one

The invention relates to electrical engineering, in particular to permanent magnet shielded systems.

Magnetic systems based on permanent magnets are known, designed to create an axially symmetric strong magnetic field in the working gap between the rod or disc magnets, which are placed in a magnetically soft magnetically unsaturated screen and connected by their poles to screen 1.

However, in the known magnetic systems, to avoid strong shunting of the working magnetic flux by the screen, a large additional gap is required between the outer diameter of the magnets and the screen, which leads to a sharp increase in size and weight of the magnetic systems, since the main contribution to the weight of modern shielded systems based on high-energy magnets is made by the screen magnet system.

Reducing the size of the screen leads to an increase in its shunting effect on the working fluxes of the magnets, and consequently, the need for Dimost to increase the size (and weight) of the magnets to maintain the required level of the working magnetic field.

A magnetic system is known, which contains axially non-axial disk and holtse magnets located inside a closed magnetically unsaturated screen and connected to it by the same poles 2. In such a system, you can get a magnetic

the field is larger than in similar systems made only on the basis of rod or ring magnets, however, it is impossible to obtain a magnetic field in the working gap greater than the total one (that in the state of providing a rod magnet and axially magnetized ring magnet separately in the same screen) . In addition, there are large magnetic scattered fluxes in the system with additional soft magnetic parts connecting the same poles of magnets located in the central part of the magnetic system; The working space for placing the device is limited by the internal diameter of an axially magnetized magnet, and the axially magnetized magnet itself is, firstly, used in an unfavorable way for it due to shunting its magnetic fluxes parallel to the outer surface of its cylindrical surface ec.

wound, secondly, it must be difficult to cut open (which is laborious for modern magnet of hard materials) in order to pass the output of energy and power cables of the device.

Claims (2)

In order to increase the strength of the magnetic field in the working gap of the magnetic system, the ring magnet is magnetized radially and positioned so that there is a gap between the magnets. FIG. Figure 1 shows the vertical and horizontal sections of the simplest version of a screened magnetic system based on mutually perpendicularly magnetized dicoBoro and ring magnets; in fig. 2 - horizontal and vertical sections of the magnetic system with a symmetric, relative to the plane of the free pole of a disk magnet, a radially magnetized magnet; in fig. 3 - vertical and horizontal sections of the magnetic system with a displaceable radially magnetised magnet. The magnetic system contains a soft magnetic screen in the form of a glass 1 with an end cap 2, to the inner flat wall of which an axially magnetized disk magnet 3 is attached by one of the poles. A contact magnet is mounted around the disk magnet 3 creating a useful magnetic field in the working gap 4 An annular radial magnetised magnet 5 is screened. An air gap is provided between the axially magnetized and the radially magnetized magnets. FIG. Figure 2 shows an embodiment of the magnetic system for creating a strong field in the working gap. The ring radial magnetised magnet 6 is symmetrical with respect to the pole tip 7 of the disk magnet 3. Pole tip 7 can be used to smooth out the inhomogeneities of the magnetic field at the free pole of the magnet 3. In FIG. 3 shows an embodiment of a magnetic system with a strong adjustable magnetic field in the working gap. An annular radially magnetized magnet 8 is rigidly attached to a magnetically soft magnetically unsaturated ring 9 having a thread on the outer surface that enters the thread on the screen of the screen 1. The magnet 8 can slip relative to the axis of the system when the cover 2 is rotated the pin 10 is strengthened, passing through the small hole 11 and leading the ring 9 together with the magnet 8. If the magnetic system is symmetric, i.e., two disk magnets connected to the screen are coaxially mounted one against the other, then the radial magnets A low magnet is mounted around each of the disk magnets. Thus, the proposed magnetic system.ma is able to provide a magnetic field 20% higher than the same dimensions and weight of the magnetic system, taken as a prototype, and 30% more than the same dimensions and weight of the system analogs. In it, you can freely move the ring magnet relative to the disk and thereby regulate the magnetic field in the working gap. The magnetic system is used with magnetrons tuned by voltage, and instruments requiring a concentrated, strong axially symmetric magnetic field. In addition, behind the plane of the free pole of a disk magnet, the shielded space is free, so that it can comfortably accommodate both the generator and its high-frequency circuit. Claims Magnetic system containing disk axially magnetized and ring magnets located inside a closed magnetically unsaturated screen and connected to it with like poles, characterized in that in order to increase the magnetic field in the working gap of the magnetic system, a ring magnet magnetized radially and positioned so that there is a gap between the magnets. Sources of information taken into account in the examination: 1.Yu. A. Melnikov, “Permanent magnets for electrovacuum microwave devices, ed. “Modern Radio, Moscow, 1967, p. 149, 7, 1. 2. Author's certificate LL 274847, M. Kl.2 N 01J 23/08, 25.10.68 (prototype).