SU898518A1 - Device for thermomagnetic processing and magnetizing of multipole permanent magnets - Google Patents

Description

(54) DEVICE FOR HEAT-TREATMENT

And magnetization of multipolar permanent magnets

The invention relates to electrical engineering, and more specifically, to technological equipment used in the manufacture of permanent magnets, and can be used primarily in the manufacture of multi-pole rotors of electric micromachines to create a magnetic field during their thermomagnetic treatment, testing and magnetization in those cases when these rotors have a center hole. Devices are known for creating a magnetic field during their thermomagnetic processing, testing and magnetization, which are made in the form of an electromagnet or a magnetic system with permanent magnets and have pole pieces concentrating the magnetic flux 1. However, these devices do not provide the required magnetic field strength when processing small-sized magnets, which leads to poor-quality magnetization. The purpose of the invention is to increase the quality of magnetization. This goal is achieved by the fact that in a device containing a multipole magnetic field source, located on the outer side of the processed permanent magnet, which can be fulfilled, for example, in the form of an electromagnet, it additionally contains a rod of conductive material located along the axis of the multipole source a magnetic field, covered from the outside by an insulating material and cut into identical conductors by plates of insulating material located in planes of symmetry along The external field of the multipole source contains a field, and these conductors are connected to each other with a direct current source in an electrical circuit so that the direction of the current in adjacent conductors is opposite, and the field created by these conductors strengthens the field in the working volume, generated by an external source. FIG. 1 shows the device, a general view; in fig. 2 - rod sketch.

As an example, the case is considered when the device has four voltages and is intended for round permanent magnets.

The device consists of an external four-pole source (not shown) with polar tips 1, into which is placed the machined magnet 2, which has a central opening. Through this hole, a rod of conductive material (Fig. 2) is passed, insulated from the magnet by a gasket 3 and dissected by plates 4 of an insulating material located in the symmetry planes of the poles 1 into identical conductors 5. The conductors 5 are connected at the ends by jumpers 6 and connected to to a direct current source with the help of current leads 7. With such a connection, the direction of the currents in the conductors adjacent to each other is opposite, and if the polarity of the direct current source is properly selected, the field produced by ikami 5, increases in the magnet body (in the working volume device) vneschnego four-pole field source (see. FIG. 1).

The device works as follows. When magnetizing the magnet before installing it into the product.

A cylindrical magnet to be magnetized and having a central hole is mounted on a rod (Fig. 2), an external four-pole magnetic field source fixed to the center of the working gap. An unipolar current pulse is applied to the coils of the electromagnet. Simultaneously, the unipolar current pulse is podzets and into the rod (Fig. 2) through the current leads 7. The polarity of the pulse fed to the rod must be such that the field strength vector from the external source and the field created by the rod inside the magnet on the equipotentials (line AB, CD of Fig. 1) coincided in direction. Thereafter, the magnetized magnet is removed from the device. With thermomagnetic treatment (TMO) of the magnet.

The magnet to be processed is heated to the required temperature. Then, the heated magnet is removed from the furnace and is put on the rod (Fig. 2), reinforced in the center of the working gap of an external four-pole magnetic field source. A constant current is applied to the electromagnet windings and the rod for the time required for the TMT. The polarity of the current in the rod and the coils of the electromagnet is selected as in paragraph a. After passing the TMO

The magnet is removed from the device.

The use of the device allows to increase the magnetic properties of multipole rotors by increasing the efficiency of their thermomagnetic treatment, to provide better

magnetization of multi-pole magnets during testing and magnetization before placing into the product, which ultimately will increase the parameters of electrical microscopes.

Claims (1)

Invention Formula A device for thermomagnetic treatment and magnetization of multi-pole permanent magnets having a central hole containing a multi-pole magnetic field source located on the outside of the magnet, characterized in that, in order to improve the quality of magnetization, the device further comprises a rod of conductive material located along the axis of the multi-pole source of a magnetic field, covered from the outside with an insulating material and cut along the axis into identical conductors by plates and insulating material disposed in planes of symmetry of the pole vneschnego mnogopolgosnogo source floor, wherein the conductors are connected at the ends mezh0 a row so that the direction of current in the adjacent conductors to each other oppositely. Sources of information taken into account during the examination 1. Dovgalevsky Ya. M. Permanent magstas from magnico alloys. Mechanical Engineering M., 1964 (prototype).