SU437134A1 - DC solenoid - Google Patents

Description

one

Basically auth. St. No. 259274 describes a direct current electromagnet containing a magnetic conductor and a permanent magnet with pole pieces, a magnetically soft sleeve located at a distance from the permanent magnet, and a coil with a source of direct current and used to control the magnitude the intensity of the magnetic field in the working gap.

The purpose of the invention is a more policy to use the energy of a permanent magnet.

For this, the magnet bushing is fixed on the magnetic conductor with the possibility of movement, it has guide slots and adjustment screws.

FIG. 1 shows the proposed electromagnet; in fig. 2 is a working diagram of the magnet.

The proposed electromagnet consists of a magnetic conductor 1, a permanent magnet 2 and a pole 3 to tips 3, a magnetising coil 4, a working gap 5, a movable split magnetic soft sleeve 6 fixed on the magnet duct with the help of a driving screw 7 and guide slots 8 .

The meaning of moving the magnetically soft sleeve is to prevent the working point of the magnet from being shifted to a position other than optimal.

This is achieved in the following ways.

In the normal position of the electromagnet, when the sleeve 6 is retracted from the permanent magnet 2, the coil 4 is de-energized, in the working gap 5 the nominal value of the field strength (in the optimal designed electromagnet - the maximum possible). In this case, the operating point A of magnet 2 after its magnetization together with the reinforcement lies on the demagnetization curve B, JJc (see

FIG. 2).

For a field tension, the field in the working gap 5 should, and gradually increase the current of the magnetizing coil 4 connected to the direct current source so that its flow was directed against the flow of the constant magnet with the help of screw 7 along the guides cut m 8 in the axial direction by an amount, which is proportional to the current change (nanometer, to the position indicated in dotted line in Fig. 1).

The flux of the magnetizing coil (and since it is directed against the flux of a constant. Magnet) would have to be demagnetized

The magnet, i.e., the operating point A (see Fig. 2) of the magnet would have to descend lower along the demagnetization curve. However, demagnetization does not occur due to the fact that the magnet bushing has approached the magnet,

increasing the total magnetic conductivity n

thereby initiating a tendency to raise the working point of the magnet along a direct AK.

The increment of the current of the magnetizing coil is consistent with the displacement of the sleeve so that the demagnetizing action of the coil is compensated for by an increase in the magnetic conductivity of the system, and then the operating point A of the magnet will remain in the same position. The flux, and hence the intensity of the floor in the working gap of the electromagnet, is reduced due to the oncoming flux of the biasing coil.

In order to increase the voltage in the working gap 5 of the electromagnet, the polarity of the direct current in the coil 4 is changed, and the magnet bushing 6 is retracted from the permanent magnet by means of a driving screw 7 along the guide slots 8.

An increase in the flow in the working gap of the electromagnet will occur due to the "return of a part of the flow previously bridged by the sleeve and the flow of the bias coil, in this case according to the direction of the flow of the permanent magnet.

As follows from the description, the operating point A of the magnet never drops below the initial (optimal) position. This means that the magnet is not demagnetized.

Subject invention

DC solenoid auth. swith No. 259274, characterized in that, in order to more fully utilize the energy of the permanent magnetite, the magnetic sleeve is fixed on the magnetic core with the possibility of movement, has guide slots and adjustment screws.

Nka / m

Bb

B, m.ff

FIG. 2