SU1195299A1 - Arrangement for counting coil windings number - Google Patents

Description

The invention relates to measuring equipment, in particular to control devices winding products. The purpose of the invention is to improve the measurement accuracy. In the coil 3, performing the function of excitation, and the reference coil from the alternator I and the alternator 2, the current is set, under the action of which the magnetic circuit 4 is in saturation. The current set by the DC generator 5 flows through the controlled coil 7 and creates in the magnetic core 4 the magnetic field strength, the direction of which is opposite to the current strength generated by the 1 n 2 generators. The number of turns in the controlled coil 7 is determined from the ratio 21,

ω _ζ = ω, —p — t ~ 7 ~ - "where ω, ¹ 2 ¹ 2

the number of turns in the coil 3;

- current value from generators

I and 2} Ι2 - the value of the current generator 5, in which equality is performed on the outgoing section of the hysteresis loop; 1 * 2 - the value of the current generator 5, in which the equality is performed on the falling part of the hysteresis loop. 1 hp f-ly, 2 ill.

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Background

1 11

The invention relates to electrical engineering, in particular to control devices winding products, such as transformer coils and chokes used in electronic equipment.

The purpose of the invention is to improve the measurement accuracy by measuring the ratio of direct currents through the measured and reference coils, the values of which are obtained using the high steepness of the hysteresis characteristic of the magnetic circuit, and simplifying the design by using the excitation coil as a reference.

Fig. 1 shows a block diagram of a device for measuring the number of turns, in which the excitation coil and the reference coil are made as one coil; Fig. 2a-d are diagrams explaining the operation of the device; induction on the magnetic field strength (hysteresis loop); in Fig. 26 the change in time of the magnetizing force in the core under the action of the difference of currents 1 ₂ and 1 ₂ ; in Fig. 2c, the change in the AC voltage in the winding increases;

95299 ²

where H _with - the coercive force of the magnetic circuit;

β is the length of the average power line of the magnetic circuit;

five

1-1

ten

_{2, the} magnitude of the generator current 5, in which equality is performed on the outgoing section of the hysteresis loop, the magnetic field strength in the magnetic core corresponds to its maximum magnetic permeability, the alternating current of the generator X causes the maximum magnetic induction increment in the magnetic core and the maximum emf in the controlled coil 7 fixed by indicator 6.

Further increase in current 1 _? input Dit magnetic circuit in saturation. With

20 the subsequent decrease in the current magnetic permeability has a maximum when the equality

ι'Χ-ι, Μ, ^ζ ~ ^Η Λ

25

gke ts ?, - mc

2g - the same, with decreasing Ι _ζ . Number measuring device

The coil channels contains an alternating current generator 1 and a direct current generator 2, which are connected to the coil 3, which acts as an excitation coil and a reference coil, the magnetic circuit 4, the generator 5 of sufficient current and an indicator 6 connected. data to the controlled coil 7.

In coil 3, having \ ¥ ₍ coils, alternator current is set from generator 1, and direct current 1 from generator 2, under the action of which the magnetic circuit 4. is saturated. A current of 1 _g , set by generator 5 _, flows through coil 7 having coils , and creates a magnetic field magnetic field, the direction of which is opposite to the intensity created by the current I ,.

When performing equality

where 1 ₂ is the magnitude of the current of the generator 5, in which equality is performed on the falling part of the hysteresis loop.

30 The value is determined similarly. The number of turns in the controlled coil 7 is determined from the ratio

V) = \ D /.

35

_to

Claims (2)

Claim 1. A device for measuring the number of turns of coils, containing a magnetic circuit with an excitation coil and a reference coil closed during the measurement, an alternating current source, an indicator and a controlled coil that differs — in order to improve the accuracy of measurements two DC generators, one of which is connected to a reference coil, and the other to a controlled coil. 2. The device according to claim 1, characterized in that, in order to simplify the construction, the excitation and reference coil is made in as a single coil. ιΧ- ι, νν, = M 1195299 FSh.2