Three-phase common-mode inductor

Abstract

The utility model discloses a three-phase common-mode inductor, which belongs to the technical field of common-mode inductors, and comprises a magnetic ring, a first winding, a second winding and a third winding, the first winding adopts an insulated enameled wire and comprises two sections of windings which are connected in series, the two sections of windings are oppositely wound on the magnetic ring, and the third winding is wound on the magnetic ring. The second winding and the third winding are oppositely wound on the magnetic ring by adopting enameled wires; and the second winding and the third winding are isolated by the two sections of first windings. According to the utility model, one winding (the first winding) is divided into two parts and is formed by winding the completely insulated enamelled wires, the other two windings wound by the common enamelled wires are isolated, the completely insulated enamelled wires can bear higher withstand voltage, and the paint film is not easy to damage, so that the short-circuit risk is low even if the windings are in contact with each other, and the service life of the transformer is prolonged. According to the utility model, the volume increase of a product caused by an electrical gap existing in the winding of a common enameled wire can be reduced, and under the same specification of magnetic rings, the structure can be used for winding a larger wire diameter and passing a larger current.

Description

Technical Field

[0001] This utility model relates to a three-phase common-mode inductor and belongs to the field of common-mode inductor technology. Background Technology

[0002] A three-phase common-mode inductor consists of three inductor coils, each corresponding to one of the three phases of the power supply. It effectively suppresses common-mode interference in a three-phase power supply. Current three-phase common-mode filter inductors are made by winding three identical turns of conventional enameled wire (P180 polyurethane enameled wire) onto a magnetic ring in the same direction. To ensure the product operates under high voltage conditions, a certain electrical clearance must be maintained between the different windings; the higher the voltage, the larger the clearance, which means the product size will also increase. With the increasing miniaturization and lightweighting of electronic products in recent years, conventional three-phase common-mode inductors are no longer suitable for market demands. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a three-phase common-mode inductor that can be miniaturized.

[0004] The technical solution adopted by this utility model is as follows: a three-phase common mode inductor, including a magnetic ring, a first winding, a second winding and a third winding. The first winding is made of insulated enameled wire and includes two winding segments connected in series. The two winding segments are wound on the magnetic ring relative to each other. The second winding and the third winding are both made of enameled wire and wound on the magnetic ring relative to each other. The two first winding segments isolate the second winding and the third winding.

[0005] Furthermore, the insulating enameled wire of the first winding is FIW wire, and the enameled wire of the second and third windings is P180 polyurethane enameled wire.

[0006] Furthermore, the aforementioned magnetic ring is an iron powder core magnetic ring, a manganese-zinc magnetic ring, or an amorphous magnetic ring.

[0007] The beneficial effects of this utility model are as follows: Compared with the prior art, this utility model divides one of the windings (the first winding) into two parts and uses fully insulated enameled wire to wind it, while isolating the other two windings wound with ordinary enameled wire. The fully insulated wire (FIW wire) can withstand higher withstand voltage and the enamel film is not easily damaged. In this way, even if the windings come into contact with each other, the risk of short circuit is low. It can reduce the increase in product size caused by the electrical clearance of ordinary enameled wire winding. Under the same specification magnetic ring, the structure of this utility model can wind a larger wire diameter and carry a larger current. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a three-phase common-mode inductor. Detailed Implementation

[0009] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0010] Example 1: As Figure 1 As shown, a three-phase common-mode inductor includes a magnetic ring 1, a first winding 2, a second winding 3, and a third winding 4.

[0011] Among them, magnetic ring 1 is an iron powder core magnetic ring, a manganese zinc magnetic ring, or an amorphous magnetic ring;

[0012] The first winding 2 uses insulated enameled wire and includes two winding segments connected in series, namely, the first half-turn enameled wire 201 and the first half-turn enameled wire 202. These two winding segments are wound relative to each other on the magnetic ring 1. The second winding 3 and the third winding 4 are also made of enameled wire and wound relative to each other on the magnetic ring 1. The two first winding segments isolate the second winding 3 and the third winding 4. The insulated enameled wire of the first winding 2 is FIW wire, and the enameled wire of the second winding 3 and the third winding 4 is P180 polyurethane enameled wire.

[0013] As shown in Table 1-2, the breakdown voltages of FIW wire and P180 polyurethane enameled wire are compared. It can be seen from the figure that the breakdown voltage in Table 2 is much higher than that in Table 1, indicating greater high voltage resistance (e.g., for the same 0.05mm wire, the breakdown voltage of FIW is much higher). This ensures that our products can achieve higher operating voltages and work in higher voltage environments, while also meeting the requirements of high current and high inductance three-phase common-mode filter inductors for toroidal common-mode inductors, thus satisfying the current market demand for miniaturization and lightweight electronic components.

[0014] The process of winding the coils on the magnetic ring is as follows: A first winding, a second winding, and a third winding are wound on the magnetic ring 1. The magnetic ring 1 is an iron powder core magnetic ring, a manganese zinc magnetic ring, an amorphous magnetic ring, or a magnetic ring made of other materials. After the second winding 3 is wound on the magnetic ring in a clockwise direction using ordinary enameled wire (P180 polyurethane enameled wire), the first half-turn of the first winding 2 is wound on the magnetic ring 1 using fully insulated enameled wire (FIW wire). Then, the copper wire is pulled to the other side of the first winding 2 and the second half-turn of the enameled wire 202 is wound on the magnetic ring 1. Finally, the third winding 4 is wound in a clockwise direction on the remaining part of the magnetic ring 1 using ordinary enameled wire (P180 polyurethane enameled wire).

[0015] Table 1. Breakdown voltage of ordinary P180 enameled wire and

[0016]

[0017] Table 2 Comparison of breakdown voltages of different FIW fully insulated enameled wires

[0018]

[0019] In summary, this invention divides one of the windings (the first winding) into two parts and uses fully insulated enameled wire to wind them, while isolating the other two windings wound with ordinary enameled wire. The fully insulated wire (FIW wire) can withstand higher withstand voltage and the enamel film is not easily damaged. In this way, even if the windings come into contact with each other, the risk of short circuit is low. It can reduce the increase in product size caused by the electrical clearance of ordinary enameled wire winding. Under the same specification magnetic ring, the structure of this invention can wind a larger wire diameter and carry a larger current.

[0020] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A three-phase common-mode inductor, characterized in that, It includes a magnetic ring, a first winding, a second winding, and a third winding. The first winding is made of insulated enameled wire and includes two winding segments connected in series. These two winding segments are wound relative to each other on the magnetic ring. The second and third windings are also made of enameled wire and wound relative to each other on the magnetic ring. The two first winding segments isolate the second and third windings.

2. A three-phase common-mode inductor according to claim 1, characterized in that, The first winding uses FIW wire for insulation, while the second and third windings use P180 polyurethane enameled wire.

3. A three-phase common-mode inductor according to claim 1, characterized in that, The magnetic ring is an iron powder core magnetic ring, a manganese-zinc magnetic ring, or an amorphous magnetic ring.

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