a magnetic circuit structure

Abstract

The invention relates to a magnetic circuit structure, including a coil frame and a laminated iron core inserted into the coil frame, characterized in that: the laminated iron core is formed by stacking several laminations up and down, and each stack The sheets are rings formed by butt jointing of the first laminated monomer and the second laminated monomer, and one end of the first laminated monomer is closely attached to one end of the second laminated monomer, while the first An air gap capable of setting a Hall element is formed between the other end of the laminated sheet and the other end of the second laminated sheet, and the air gaps between adjacent laminated sheets are aligned, but the closely abutting parts are mutually stagger. Compared with the prior art, the present invention has the advantages that: such a magnetic circuit structure makes the upper and lower laminations more tightly bonded and the shape of the laminations is regular after assembly, avoiding stress, and at the same time the magnetic circuit is more balanced. In addition, by Laminated iron cores are inserted into the bobbin of the wound coil, which makes winding the coil easier.

Description

technical field [0001] The invention relates to a magnetic circuit structure, in particular to a magnetic circuit structure applied to a Hall sensor. Background technique [0002] The Hall sensor is a magnetic field sensor made according to the Hall effect. In order to improve the performance of the sensor, a compensation winding is used to generate a magnetic field. Through closed-loop control, it is equal to the magnetic field generated by the measured current, and the direction is opposite, so as to achieve the effect of mutual cancellation. The current in the compensation winding is proportional to the size of the measured current. , this kind of sensor is called a closed-loop or magnetic balance Hall current sensor. Since the magnetic flux generated by the primary winding and the secondary winding cancels each other out, the magnetic flux in the iron core of the Hall current sensor is zero from a macro point of view. Therefore, the closed-loop Hall current sensor is al...

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Problems solved by technology

[0003] like figure 1 and 2 In the magnetic circuit structure shown in the prior art, when the iron cores of this magnetic circuit structure are interlaced with each other, a large gap will be generated on both sides of the magnetic circuit structure, and magnetic flux leakage will easily occur, making the air gap The thickness of the iron core laminations on one side is half that of the other side, and there is a large difference between the two sides, resulting in an uneven distribution of magnetic circuits on the iron cores on both sides of the sensor

At the same time, the shape is irregular after insertion, which will easily cause stress on the iron core and affect the performance of the product.

On the other hand, since the laminated iron core is fan-shaped, it is not conducive to the structural design of the coil and the skeleton that cooperate with the iron core, and the iron cores on both sides will obviously tilt after the laminated iron core is inserted, which is horizontal compared to the middle The iron core at the position will produce a certain stress, and the insertion of the iron cores on both sides is more difficult, which will affect the efficiency of the iron core insertion and reduce the production efficiency of the product.

In addition, the inner aperture of the coil bobbin without air gap is twice the inner aperture of the coil bobbin with air gap, resulting in the internal resistance of the coil being greater than that of the coil with air gap, thus affecting the circuit measurement range and linearity of the sensor

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