A method for measuring the saturation current of the core of an inductor, transformer, or inductor. Scheme, description

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A method for measuring the saturation current of the core of an inductor, transformer, or inductor. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur

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The way to test the inductor is extremely simple.

Two windings are wound on the core, containing an arbitrary amount of thin wire with a diameter of 0,2-0,3 mm (which will turn up under the arm), the ratio of turns should be about 10 - it doesn’t really matter either.

Method for measuring the saturation current of the core of an inductor, transformer or inductor

Example. The secondary winding is wound. Turns do not need to be counted - arbitrarily. But the primary winding - the number of turns is very important. The input voltage is adjustable from 0 to 20-25 volts. The ballast resistor is powerful and is rated in terms of power for the full current and voltage of the power source. The switching transistor is a powerful field-effect or IGBT transistor without a flyback diode. By voltage - at least 10 times must exceed the power source.

Test. We turn on the generator of rectangular pulses 2-3 Hz. When operated at such a low frequency, the turns of the primary winding will create a steady state induction in the core. Excess current is dissipated by the resistor. When the transistor closes, a pulsed voltage is induced in the secondary winding, the amplitude of which is released on the capacitor up to a certain value. The higher the induction in the core, the higher the output voltage. The inclusion of the secondary winding must be reverse, i.e. the voltage spike at the output should be when the transistor closes. the load resistor of the capacitor is a discharge resistor, it should not consume a significant current, say 10-15 mA, it is chosen arbitrarily.

Gradually increasing the input voltage from the power source (i.e. increasing the current through the primary winding) - we achieve the moment when the output voltage growth stops. All. heart was saturated. A further increase in current does not give a result. The transistor is switched briefly to the open position for 3-5 seconds and we record the ammeter readings.

Example. The primary winding is wound with 20 turns of thick wire. The current in the circuit was 22 A.

We consider 20 turns * 22 A \u440d XNUMX Amperes / turn.

Therefore, this magnetic circuit can be saturated to the limit either with one turn with a current of 440A, or 40 turns of 11 A, or 440 turns with a current of 1A. Despite the extreme simplicity of the method, it gives extremely accurate results.

This method is used to calculate magnetic amplifiers with feedback - amplistats. For ferrite chokes, the frequency can be increased.

See other articles Section Beginner radio amateur.

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