SU539283A1 - Device for determining losses in cores of magnetically soft materials - Google Patents

Description

one

The invention relates to a measurement technique and can be used to monitor pulsed cores (e.g., magnetic pulse modulators).

A device is known in which a loss is judged on the product of the quantity of electricity flowing through the winding during the input pulse and the amplitude of the pulse voltage 1.

The disadvantage of this device is the need for a special generator of rectangular pulses with a very low output impedance, the complexity of measurements and calculations in factory production.

It is also known a device for measuring the loss coefficient, in which two windings are placed on a test sample; magnetizing, grounded through the resistor, the signal from which is fed to the electronic key through the mixer and amplifier, and measuring, the signal from which is also fed to the electronic key through the second mixer and pulse shaper. In this device, the peak voltage at the output of the electronic key is measured, applying to the mixers the voltage from the additional local oscillator, and to the magnetizing winding - sinusoidal voltage 2.

However, in the case of yorpoiicTBe, the presence of two windings makes it difficult to sort the cores for serial and high-volume production. In addition, this device measures the loss when the magnetizing winding is supplied with a sinusoidal voltage (i.e., when the cores are operated with a symmetrical hysteresis loop), which does not give an idea of the magnitude of the losses when operating in the pulsed peremagnetics mode.

The purpose of the invention is to simplify the process of measuring core loss.

To do this, in ycTpoiicTBO, to determine losses in cores made of magnetically soft materials, contains a test core with a magnetizing winding placed on it {one, one end, which through a cell is connected to a volt eet electron cell, and the other end to the ground cable is connected to the volt emitter, and the other end to the ground cable is connected to the volt emitter, and the other end to the ground cable is connected to the volt emitter and the other to the ground cable is connected to the voltage of the volt eet, and the other end to the ground cable is connected to the volt emitter and the other to the ground cable is connected to the voltage of the volt eet, and the other end is connected to the ground cable connected to the volt emitter and the other to the ground cable connected to the volt emitter and the other to the ground cable connected to the volt emitter and the other to the ground cable connected to the volt eet and 14 a capacitor, a catuipha bottom and a controllable key, with one capacitor plate connected to a) 1a time to the pictogram detector and the winding winding, and the second through a resistor to the voltage source. parallel to which a sequence is connected, L10 connected to the key and the bottom of the catupka. connected to the second capacitor plate.

Claims (2)

The drawing shows the device circuit diagram. The device contains a voltage source 1, a resistor 2, a discharge coil 3, a control unit 4 with an electronic key, an electronic switch 5, a capacitor 6, a test core 7, a magnetizing winding 8, a peak detector 9, an electronic voltmeter 10. When the circuit is turned on, a storage capacitor 6 is charged from the voltage source 1 through the resistor 2 and the magnetizing winding 8. When the voltage on the capacitor 6 reaches a predetermined value Le, the control unit 4 is activated with an electronic switch that starts the electronic switch 5 and the capacitor 6 is discharged is pressed through the circuit: the discharge of the coil 3 — the electronic key 5 — the magnetizing winding 8. When selecting the circuit elements, the following conditions must be met where — the resistance of the resistor 2, L — the inductance of the magnetizing winding 8, LI — the inductance of the discharge coil 3. If these conditions are met , the discharge current of the storage capacitor can be considered independent of the quality of the test core 7 and, therefore, the self-induction voltage at the ends of the magnetizing winding 8 will depend only on the magnitude of the loss resistance p. It is input to the peak detector 9 and measured with an electronic voltmeter 10. Formula for determining the loss in cores of magnetically soft materials containing a test core with a magnetizing winding placed on it, one end of which is connected to an electronic voltmeter through a peak detector and the other end to a grounded voltage source, characterized in that, in order to simplify the measurement process, a capacitor, a discharge coil and a control key, one on of capacitor is connected simultaneously to a peak detector and a field winding, a second - via a resistor to a voltage source, in parallel which are connected in series and connected to the key bit bottom coil connected to the second capacitor plate. Sources of information taken into account in the examination: 1.Avt. St. USSR 203761, M. Kl. G01R 33/12, 1969 (equivalent). 2. Avt. St. USSR number 333503, M. CL. G 01R 33/12, 1972 (prototype).