SU1684817A1 - Device for impulse magnetization of permanent magnets - Google Patents

Abstract

The invention relates to electrical engineering and can be used to magnetize the permanent magnets of electrical machines. The purpose of the invention is to simplify the design by achieving the fact that the magnetizing unit 10 is provided with a reverse electromotive voltage (EMF) winding 11, shunted by a variable resistor 12 and inductively coupled counter to the winding of the magnetizing unit 12. 2 Il.

Description

Phie.1

The invention relates to the field of electrical engineering and can be used to magnetize the permanent magnets of electrical machines.

The purpose of the invention is to simplify the device.

FIG. 1 shows the electrical circuit of the proposed device; in fig. 2 - diagrams of electrical parameters of the device.

A device for pulsed magnetization of permanent magnets consists of a source of direct current 1 (Fig. 1), a battery of capacitors 2, a charging resistor 3, a button charge 4, a button discharge 5, a limiting resistor 6, a pulse transformer, a diode 8 , controlled valve 9, magnetizing unit with a winding 10, a compensating winding 11 and a variable resistor 12.

The device works as follows.

When the Charging button 4 is pressed, the capacitor battery 2 is charged up to the value UH (Fig. 2). At the moment of time, when the button Bit 5 is closed, a single pulse of positive polarity is generated by the pulse transformer 7, which opens a gate S by means of a diode in connection with the controllable valve, so that the charge voltage of the capacitor battery 2 is applied to the magnetizing winding 10 the magnetizing unit and in the time interval the voltage UH drops to zero and the magnetizing current 1H increases from zero to the maximum value. In this case, the voltage UH leads the load current n in phase by the angle l / 2 due to the presence of the LC circuit. In the time interval ti-t2, self-induction (negative factor) and induction (a factor used to suppress the negative influence of the self-induction process) are carried out. In this case, the self-induced EMF is applied to the battery, the capacitors 2 are inverse polarity and, as a result, at time t2, the recharge voltage reaches its maximum value, and the current n through the magnetizing winding 10 is its zero value.

At the same time, at the time ti, the induction process in the compensating winding 11 of the voltage UK begins and reaches its maximum value at time tj. Further, in the time interval, the voltage UH of the overload of the capacitor 2 unit decreases from the maximum value to zero, the reverse half-wave of the magnetizing current 1H increases from zero to the maximum value, the positive half-wave voltage of the compensation induction winding UK reaches zero, and the compensating winding current increases to 1k from zero to maximum value by means of variable resistor 12 and, finally, in the time interval ta-t, the reverse half-wave of the magnetizing current decreases to zero and the current compensates th winding 11 is also down to zero.

Thus, in the time interval, the modulation of the emission of a negative HALF-WAVE of the magnetizing current of 1 n positive half-wave compensating current of 1K is carried out, as a result of which the demagnetizing factor is excluded.

The introduction of a compensating winding into the magnetizing unit and its shunting with a variable resistor can significantly simplify the device.

Claims (1)

Invention Formula A device for pulsed magnetization of permanent magnets containing a source of direct current, a charging resistor, a capacitor battery, a charge button, a discharge button, a limiting resistor, a pulse transformer, a coupling diode, a controllable valve, and a magnetizing unit with a winding One end of the winding of the magnetizing unit is connected to the cathode of the controlled valve, the anode of which is connected to the switch of the direct current source through the charging resistor and the charge button, the controlled electrode of the controlled valve dklyuchen through the coupling diode to the second winding of the pulse transformer, and its primary winding by means of a limiting resistor and the discharge button to the positive DC source, the battery the capacitors are connected in parallel to the series-connected controllable valve and the winding of the magnetizing unit, characterized in that, in order to simplify the device, the magnetizing unit is equipped with a shunt variable resistor and a compensating winding EMF, the second end of which is inductively connected to the winding of the magnetizing unit. connected to the minus of the DC source.  AND Eo6sh t About t, (2 ъ Fi.2