CN221379142U - Inductance assembly and filter - Google Patents

Abstract

The utility model relates to the technical field of power electronics, in particular to an inductance component and a filter. The inductance component comprises an annular magnetic core, a winding, a magnetic column, a bottom plate and pins, wherein the magnetic column is arranged at the top and the bottom of the annular magnetic core parallel to the winding, the magnetic column is divided into an upper part and a lower part, and gaps are formed between the upper part and the lower part of the magnetic column. The gap size can be adjusted through the rotating magnetic column, leakage inductance of the inductance component can be flexibly obtained, the leakage inductance can be used as differential mode inductance, differential mode inductance is omitted in a system, the structure is more compact, the winding adopts a foil winding, the capacitor is integrated into the inductance component through winding the capacitor winding, a capacitor in the system is omitted, the structure is also more compact, and the size of a filter adopting the inductance component is reduced.

Description

Inductance assembly and filter

Technical Field

The utility model relates to the technical field of power electronics, in particular to an inductance component and a filter.

Background

The common mode inductance has good inhibition effect on electromagnetic interference generated in the working process of power electronic devices in the electric energy conversion and control circuit. The motor driving system generates electromagnetic interference during operation, so that the stability of the driving system is affected, the service life of the motor is reduced, and the failure rate of the system is increased.

The filter can effectively reduce electromagnetic interference, has advantages in a full frequency range, and the inductor in the filter receives current of a main loop, so that the inductor winding is thicker, the size is larger, and the size of the passive filter is larger.

The existing filter has the advantages of large volume, heavy weight, needs further optimization, and is suitable for the development directions of high frequency, miniaturization and high efficiency.

Disclosure of utility model

The utility model mainly aims to solve the technical problems that the filter occupies large space in the existing motor driving system so as to adapt to the development directions of high frequency, miniaturization and high efficiency.

To achieve the above object, the present utility model provides an inductance assembly, a filter applied to a motor driving system, comprising: the winding is respectively wound with the mutually parallel annular magnetic cores, the magnetic columns are arranged at the top and the bottom of the annular magnetic cores parallel to the winding, the magnetic columns are an upper part and a lower part, gaps are formed between the upper part and the lower part of the magnetic columns, one end of each magnetic column is in threaded connection with the annular magnetic cores, the winding is a foil winding, the foil winding comprises a metal copper sheet, an insulating layer and a capacitor winding, and the capacitor winding is a Y capacitor winding.

Further, the annular magnetic core and the magnetic column are made of iron-aluminum alloy, iron-nickel alloy, iron-silicon-aluminum alloy, manganese-zinc ferrite, nickel-zinc ferrite, magnesium-zinc ferrite, iron-based amorphous alloy, iron-cobalt-based amorphous alloy, iron-nickel-based amorphous alloy or cobalt-based amorphous alloy;

The utility model provides a filter applied to a motor driving system, which comprises the inductance component.

According to the technical scheme, the coil winding is adopted, the magnetic column is arranged in the middle of the annular magnetic core, the gap is arranged in the middle of the magnetic column, the gap size of the magnetic column can be adjusted, leakage inductance of the inductance component can be flexibly obtained, the leakage inductance can be used as a differential mode inductance, the differential mode inductance is omitted in the system, the structure is more compact, further, the foil winding is adopted, the capacitor winding is wound, the capacitor is integrated into the inductance component, the capacitor in the system is omitted, the structure is more compact, and the size of the filter adopting the inductance component is further reduced.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a passive filter according to an embodiment of the present utility model;

fig. 2 is a perspective view of an inductance assembly according to an embodiment of the present utility model;

fig. 3 is a cross-sectional view of the inductance assembly of fig. 2;

fig. 4 is a perspective view of a foil winding of a winding in an embodiment of the utility model.

Reference numerals illustrate:

Reference numerals	Name of the name	Reference numerals	Name of the name
				1	Inductance assembly	15	Pin
11	Annular magnetic core	16	Metal copper sheet
				12	Winding	17	Insulating layer
13	Magnetic column	18	Capacitor winding
				14	Bottom plate

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, top, and bottom) are involved in the embodiment of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

The filter mainly refers to a passive filter and comprises passive elements such as an inductor, a capacitor, a resistor and the like. The inductor can be a common-mode inductor, a differential-mode inductor or a differential-mode inductor integrated into a whole. The inductor and the capacitor can be integrated to form an integrated inductor. Likewise, the integrated differential and common mode inductances are also referred to as integrated inductances.

Fig. 1 is a schematic diagram of a passive filter, including a common-mode inductance L1, a common-mode capacitance C2, a common-mode capacitance C3, a differential-mode inductance L2, and a differential-mode capacitance C1. The common-mode inductance L1 suppresses the common-mode disturbance current, and the differential-mode inductance suppresses the differential-mode disturbance current. The filter structure can effectively inhibit electromagnetic interference in a system loop, and the common-mode inductance L1 and the differential-mode inductance L2 in the loop bear current of the loop, and have larger impedance and larger volume.

Referring to fig. 2 and 3, fig. 2 is a perspective structural view of an inductance assembly according to the present utility model, and fig. 3 is a cross-sectional view of fig. 2. The inductance assembly comprises a toroidal core 11, windings 12, magnetic posts 13, a bottom plate 14 and pins 15.

The toroidal core 11 may be of unitary construction or may be assembled from multiple parts. Referring to fig. 2, the toroidal core has a rectangular structure, and the molding process and the mold have simple structures, so that the magnetic leakage is reduced.

The toroidal core 11 and the magnetic leg 13 may be an iron-aluminum alloy, an iron-nickel alloy, an iron-silicon-aluminum alloy, a manganese-zinc ferrite, a nickel-zinc ferrite, a magnesium-zinc ferrite, an iron-based amorphous alloy, an iron-cobalt-based amorphous alloy, an iron-nickel-based amorphous alloy, or a cobalt-based amorphous alloy.

The windings 12 are metallic copper enameled wires. The windings 12 are wound around the mutually parallel toroidal cores 11, respectively, the diameter of the windings 12 being equal to the number of turns and the winding directions being opposite.

Referring to fig. 2, the magnetic columns 13 are disposed at the top and bottom of the toroidal core 11 and parallel to the windings 12, and when current flows in from the same-name end of the inductance assembly 1, the toroidal core 11 of the inductance assembly 1 generates magnetic flux in the same direction, and leakage magnetic flux is generated in the magnetic columns 13. The magnetic column 13 is an upper part and a lower part, a gap is formed at the middle position of the magnetic column, the lower part magnetic column 13 is fixedly arranged at the bottom of the annular magnetic core 11, the upper part magnetic column 13 is arranged at the top of the annular magnetic core 11, and the connection mode of the upper part magnetic column 13 and the annular magnetic core 11 comprises threaded connection or clamping connection. The movable connection mode can adjust the size of the gap, and leakage inductance of the inductance component 1 is flexibly obtained. The leakage inductance of the inductance component 1 can be used as a differential mode inductance, a differential mode inductance element is omitted, and the whole volume is reduced.

The utility model also provides a filter, which comprises the inductance component 1, the common-mode capacitor C2, the common-mode capacitor C3 and the differential-mode capacitor C1, and referring to fig. 1 and 2, the differential-mode inductance value provided by the inductance component 1 is increased by increasing the magnetic leakage of the inductance component 1, the inductance component 1 can be used as the common-mode inductance and also can be used as the differential-mode inductance, one electric element in a system is omitted, the whole occupied space is reduced, and the miniaturization of the filter is further realized.

By way of example, the windings 12 in embodiments may be foil windings including a metallic copper sheet 16, an insulating layer 17, and a capacitive winding 18. The insulating layers 17 are arranged on two sides of the metal copper sheet 16, the thickness of the insulating layers is 0.2-2 mm, the capacitor winding 18 is a Y-shaped capacitor winding, and the material is ceramic or metal film. When foil windings are selected, the inductance assembly 1 may not include the magnetic pillar 13. The capacitor winding 18 is integrated in the foil winding, so that common-mode capacitance is omitted for common-mode inductance, and the capacitance of the capacitor can be adjusted by adjusting the area of the metal copper sheet 16 or the capacitor winding 18 in the foil winding and the material of the insulating layer 17. The structure omits a capacitor element, so that the whole structure is more compact, and the miniaturization of the filter is realized.

The foregoing description is only of the optional embodiments of the present utility model, and is not intended to limit the scope of the utility model, and all the equivalent structural changes made by the description of the present utility model and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the utility model.

Claims (3)

1. An inductance assembly for a filter of a motor drive system, comprising: annular magnetic core (11), winding (12), magnetic pillar (13), bottom plate (14) and pin (15), wherein, winding (12) twine annular magnetic core (11) that are parallel to each other respectively, magnetic pillar (13) set up in the top and the bottom of annular magnetic core (11) that are on a parallel with winding (12), magnetic pillar (13) are upper and lower two parts, upper and lower two parts of magnetic pillar (13) form the clearance, a serial communication port, the one end of magnetic pillar (13) with annular magnetic core (11) threaded connection, winding (12) are foil winding, foil winding includes metal copper sheet (16), insulating layer (17) and capacitor winding (18), capacitor winding (18) are Y capacitor winding.

2. The inductance assembly of claim 1, wherein said toroidal core (11) and said leg (13) are iron-aluminum alloy, iron-nickel alloy, iron-silicon-aluminum alloy, manganese-zinc ferrite, nickel-zinc ferrite, magnesium-zinc ferrite, iron-based amorphous alloy, iron-cobalt-based amorphous alloy, iron-nickel-based amorphous alloy, or cobalt-based amorphous alloy.

3. A filter for use in a motor drive system, comprising an inductance assembly according to any one of claims 1-2.