CN110739807B

CN110739807B - Device for filtering output line of motor

Info

Publication number: CN110739807B
Application number: CN201910972252.3A
Authority: CN
Inventors: 刘劭政
Original assignee: Jiangxi Tsinghua Taihao Sanbo Motor Co Ltd
Current assignee: Jiangxi Tsinghua Taihao Sanbo Motor Co Ltd
Priority date: 2019-10-14
Filing date: 2019-10-14
Publication date: 2021-06-25
Anticipated expiration: 2039-10-14
Also published as: CN110739807A

Abstract

The invention discloses a device for filtering an output line of a motor, which comprises an electric connector (1), a shielding box body (2), a filter (3), a screw component (4), a conductive rubber strip (5), a cover plate (6) and a connecting cable (7), and is characterized in that: the two electric connectors are respectively connected to two ends of the shielding box body, the filter is arranged in the shielding box body through screw components, the shielding box body is connected with a cover plate, the cover plate is connected to the upper end of the shielding box body through a plurality of countersunk screws, a conductive rubber strip is arranged between the cover plate and the upper end face of the shielding box body, and one or a plurality of connecting cables are connected with the electric connectors through plug-in type connectors. The problem that the on-line transmission cannot be processed due to insufficient consideration of the electromagnetic compatibility of the early product is solved, the environmental adaptability of the early product is improved, and the electromagnetic interference transmitted through the cable can be well reduced.

Description

Device for filtering output line of motor

Technical Field

The invention relates to the technical field of electromagnetic compatibility of electronic equipment, in particular to a device for filtering an output line of a motor.

Background

At present, due to the development and wide application of electronic equipment, a complex electromagnetic environment is caused, and the interference is increasingly serious. This has led to the emergence and rapid development of electromagnetic compatibility (EMC) technology, and many products have certain requirements on whether the products can pass EMC tests, wherein EMC is mainly divided into two parts, electromagnetic interference (EMI) and electromagnetic interference resistance (EMS). In the practical application process, a device which generates a large amount of interference, such as a motor or a switching power supply, often appears in a system-level device, the interference generated by such a device can be shielded by manufacturing a faraday-like cage housing to prevent electromagnetic interference generated by such a device from being radiated and conducted in a space, and in a circuit, the electromagnetic interference generated by such a device can still be conducted to other devices in the circuit through a cable to generate interference on other devices in the circuit, which may cause damage such as device failure.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, provides a device for filtering the output line of a motor, solves the problem that the on-line conduction emission cannot be processed due to the insufficient consideration of the electromagnetic compatibility of the early product, improves the environmental adaptability of the early product, and can better reduce the electromagnetic interference conducted through a cable.

The invention mainly carries out electromagnetic compatibility processing on the output end of the motor or the input end of the control screen, the filtering component can be added outside the outlet end of the motor or inside the control screen, and carries out filtering processing on the current transmitted by the motor through a filter inside the component.

A filtering device for a motor output connection cable mainly comprises three parts, wherein an external metal shell is integrally electroplated, and a Faraday cage is integrally formed after the surface of the metal shell is conducted and assembled everywhere, so that radiation conduction in a box body can be effectively shielded, and the radiation conduction of an external electromagnetic field can also be shielded, so that the phenomenon that the radiation conduction of the external electromagnetic field generates interference on the cable after filtering in the box body, and a large number of disturbing signals still exist in the cable after filtering is avoided; the internal filter mainly plays a role in filtering the output line of the motor, and the medium electromagnetic interference conducted in the output of the motor is reduced; the electric connector is mainly used for connecting an internal circuit and an external circuit, the output line of the motor is filtered by the device and then conducted out, and meanwhile, the connector form is adopted, so that the interference of external electromagnetic radiation can be reduced. Meanwhile, the device is provided with a connecting cable with proper length, which is responsible for connecting the device into the original circuit without influencing the wiring of the original circuit, and input/output isolation is realized as much as possible during wiring, at least the mutual intersection, parallel paths and the like of input/output lines of the filter are strictly forbidden, and the reduction of the filtering effect caused by the mutual coupling of the input/output is avoided.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a device to motor output line filtering, its includes electric connector (1), shielding box body (2), wave filter (3), screw subassembly (4), conductive rubber strip (5), apron (6), connecting cable (7), its characterized in that: the two electric connectors are respectively connected to two ends of the shielding box body, the filter is arranged in the shielding box body through screw components, the shielding box body is connected with a cover plate, the cover plate is connected to the upper end of the shielding box body through a plurality of countersunk screws, a conductive rubber strip is arranged between the cover plate and the upper end face of the shielding box body, and one or a plurality of connecting cables are connected with the electric connectors through plug-in type connectors.

Further, the shielding box body is a rectangular box body and comprises a bottom plate and a vertical plate, the shielding box body and the cover plate are made of metal materials and are subjected to electroplating treatment, a plurality of installation connecting holes are formed in the bottom plate, installation grooves are formed in the outer surface of the vertical plate, and the installation grooves are used for accommodating the plug-in type electric connectors.

Further, the upper end of riser is equipped with a plurality of boss portions, and boss portion is provided with draw-in groove (25), countersunk screw hole to the inside protrusion of shielding box body on the boss portion, and the cross-section of draw-in groove is the rectangle, and the draw-in groove is used for accepting conductive rubber strip (5), and conductive rubber strip's cross-section is the rectangle, with the draw-in groove phase-match.

Furthermore, a plurality of first wire connectors which are horizontally arranged and/or a plurality of second wire connectors which are vertically arranged are arranged on the electric connector, a plurality of filter connectors which are horizontally arranged are arranged at two ends of the filter, and the height of the center line of each filter connector is lower than that of the center line of each wire connector.

Furthermore, the conductive rubber strip comprises a first conductive rubber strip (51) and a second conductive rubber strip (52), wherein an isosceles trapezoid groove is formed in the first conductive rubber strip, and the second conductive rubber strip is accommodated in the isosceles trapezoid groove.

Further, the second conductive rubber strip has a conductivity and hardness greater than the first conductive rubber strip.

Further, the device is used for accessing the original circuit without influencing the wiring of the original circuit.

Furthermore, the shielding box body forms a closed Faraday cage, and the clamping groove for mounting the conductive rubber strip is arranged on the mounting surface of the shielding box body, so that the joint of the mounting surface is not a continuous linear gap any more, the joint can be reflected and absorbed at the clamping groove due to a discontinuous surface when external electromagnetic waves are transmitted, and the shielding effect is realized by connecting ground feet with the ground for discharging.

This a device to motor output line filtering makes the box body form inclosed Faraday cage, because there is the draw-in groove of installation conductive rubber on the installation face of shielding box body, makes the seam crossing of installation face no longer be continuous straight line gap, can be in draw-in groove department when external electromagnetic wave propagates because of discontinuous surface by reflection and absorption, and the rethread lower margin is connected with ground and is discharged, accomplishes the shielding effect, can reduce the electromagnetic interference through the cable conduction betterly.

Drawings

FIG. 1 is a top view and a side view of a device for filtering the output line of a motor according to the present invention; wherein (a) a top view, (b) a side view;

FIG. 2 is a front view of the structure of the device for filtering the output line of the motor according to the present invention;

FIG. 3 is a schematic view of the structure of the conductive rubber strip of the present invention;

FIG. 4 is a schematic view of a connecting cable according to the present invention;

FIG. 5 is a diagram of the test data of the CE102 middle frequency band of 0.01-10MHz before the filtering measure is not added to the output line of the motor in the prior art;

FIG. 6 is a diagram of the test data of the CE102 mid-band 0.01-10MHz after the filtering measure is added to the output line of the motor.

In the figure: the novel filter comprises an electric connector 1, a shielding box body 2, a filter 3, a screw component 4, a conductive rubber strip 5, a cover plate 6, a connecting cable 7, a wire joint 11, a bottom plate 21, a vertical plate 22, an installation connecting hole 23, a boss part 24, a clamping groove 25, an installation groove 26, a filter joint 31, a first conductive rubber strip 51, a second conductive rubber strip 52 and a sunk screw 61.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1-4, a device for filtering the output line of a motor, which comprises an electric connector 1, a shielding box 2, a filter 3, a screw component 4, a conductive rubber strip 5, a cover plate 6 and a connecting cable 7, and is characterized in that the electric connector 1 is provided with two connecting ends respectively connected to the shielding box 2, the filter 3 is arranged in the shielding box 2 through the screw component 4, the shielding box 2 is connected with the cover plate 6, the cover plate 6 is connected to the upper end of the shielding box 2 through a plurality of countersunk head screws 61, the conductive rubber strip 5 is arranged between the cover plate 6 and the upper end face of the shielding box 2, and one or more connecting cables 7 are connected with the electric connector 1 through a plug-in type joint.

The shielding box body 2 is a rectangular box body and comprises a bottom plate 21 and a vertical plate 22, the shielding box body 2 and the cover plate 6 are made of metal materials and are subjected to electroplating treatment, a plurality of mounting connecting holes 23 are formed in the bottom plate 21, mounting grooves 26 are formed in the outer surface of the vertical plate 22, and the mounting grooves 26 are used for receiving the plug-in type electric connector 1; the upper end of riser 22 is equipped with a plurality of boss portion 24, and boss portion 24 is provided with draw-in groove 25, countersunk screw hole to the inside protrusion of shielding box body 2 on the boss portion 24, and the cross-section of draw-in groove 25 is the rectangle, and draw-in groove 25 is used for accepting conductive rubber strip 5, and in an embodiment, conductive rubber strip 5's cross-section is the rectangle, with draw-in groove 25 phase-match.

The electric connector 1 is provided with a plurality of horizontally arranged lead connectors 11 and/or a plurality of vertically arranged lead connectors 11, a plurality of horizontally arranged filter connectors 31 are arranged at two ends of the filter 3, and the height of the central line of each filter connector 31 is lower than that of the central line of each lead connector 11, so that reasonable arrangement of cables is facilitated.

In a preferred embodiment, the conductive rubber strip 5 includes a first conductive rubber strip 51 and a second conductive rubber strip 52, the first conductive rubber strip 51 is provided with an isosceles trapezoid-shaped groove, the second conductive rubber strip 52 is received in the isosceles trapezoid-shaped groove, and the conductivity and hardness of the second conductive rubber strip 52 are greater than those of the first conductive rubber strip 51, so as to further improve the shielding effect.

The utility model provides a device to motor output line filtering, it mainly comprises triplex, including wave filter 3, electric connector 1 and shielding box body 2, a serial communication port, wave filter 3 passes through screw assembly 4 to be installed in shielding box body 1, and electric connector 1 installs in 2 both ends of shielding box body, finishes the back at

electric connector

1 and 3 wiring of wave filter, installs apron 6 on the shielding box body through countersunk screw 61, and wherein the wiring will violently tie vertically between electric connector 1 and the wave filter 3, accomplishes the input-output and keeps apart, avoids the intercoupling, and conductive rubber strip 5 will install in the interior/department of draw-in groove 25 of shielding box body.

The invention is realized in such a way that a gap between a shielding box body and a cover plate is sealed by a conductive rubber strip, so that the box body forms a closed Faraday cage, because a clamping groove for installing conductive rubber is arranged on the installation surface of the shielding box body, the joint of the installation surface is not a continuous linear gap any more, the gap can be reflected and absorbed by a discontinuous surface at the clamping groove when external electromagnetic waves are transmitted, and then the gap is connected with the ground through a ground pin to discharge, so that the shielding effect is realized, the device is additionally arranged at the wire outlet of a motor or the wire inlet of a control screen and is connected through a connecting cable, and the electromagnetic interference output by the motor can be effectively reduced after passing through a filter. The principle of the device for reducing electromagnetic interference adopts the common method of electromagnetic compatibility processing for shielding, grounding and filtering, so that the electromagnetic interference conducted through the cable can be well reduced.

The device for filtering the output line of the motor is connected into an original circuit, simultaneously does not influence the wiring of the original circuit, and should achieve input/output isolation as much as possible during wiring, at least strictly forbids the mutual intersection and parallel paths of the input/output lines of the filter, and the like, thereby avoiding the occurrence of mutual coupling of the input/output and reducing the filtering effect.

FIG. 5 shows the test data of 0.01-10MHz in the middle frequency band of CE102 before the filter is not added to the output line of the motor of a certain product, and it can be seen from the figure that the product exceeds the limit of 60dBuV and approaches 6.5dB at about 0.5Hz, and the same frequency band is significantly reduced after the filter is added to the output end of the motor. Fig. 6 shows that the test data of the CE102 middle frequency band 0.01-10MHz after the filtering measure is added to the motor output box of the product, the maximum reduction can be obtained by about 20dB through data comparison, the reduction can be more than 8dBuV at the other points exceeding the limit value, and after reasonable shielding and grounding processing, the better filtering effect is achieved.

The above-described embodiments are illustrative of the present invention and not restrictive, it being understood that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. The utility model provides a device to motor output line filtering, its includes electric connector (1), shielding box body (2), wave filter (3), screw subassembly (4), conductive rubber strip (5), apron (6), connecting cable (7), its characterized in that: the electric connectors are two and are respectively connected with two ends of the shielding box body, the filter is arranged in the shielding box body through screw components, the shielding box body is connected with a cover plate, the cover plate is connected with the upper end of the shielding box body through a plurality of countersunk screws, a conductive rubber strip is arranged between the cover plate and the upper end surface of the shielding box body, and one or a plurality of connecting cables are connected with the electric connectors through plug-in type connectors; the shielding box body is a rectangular box body and comprises a bottom plate and a vertical plate, the shielding box body and the cover plate are made of metal materials and are subjected to electroplating treatment, a plurality of mounting connecting holes are formed in the bottom plate, and mounting grooves are formed in the outer surface of the vertical plate and used for receiving the plug-in type electric connectors; the upper end of the vertical plate is provided with a plurality of boss parts, the boss parts protrude towards the interior of the shielding box body, clamping grooves (25) and countersunk screw holes are formed in the boss parts, the cross sections of the clamping grooves are rectangular, the clamping grooves are used for receiving conductive rubber strips (5), and the cross sections of the conductive rubber strips are rectangular and are matched with the clamping grooves; the electric connector is provided with a plurality of first wire joints which are horizontally arranged and a plurality of second wire joints which are vertically arranged, a plurality of filter joints which are horizontally arranged are arranged at two ends of the filter, and the height of the center line of each filter joint is lower than that of the center line of each wire joint; the conductive rubber strip comprises a first conductive rubber strip (51) and a second conductive rubber strip (52), wherein an isosceles trapezoid groove is formed in the first conductive rubber strip, and the second conductive rubber strip is accommodated in the isosceles trapezoid groove; the conductivity and the hardness of the second conductive rubber strip are greater than those of the first conductive rubber strip; the device is used for accessing the original circuit without influencing the wiring of the original circuit; make the shielding box body form inclosed Faraday cage, because there is the draw-in groove of installation conducting rubber strip on the installation face of shielding box body, make the seam crossing of installation face no longer be continuous straight line gap, can be in draw-in groove department when external electromagnetic wave propagates because of discontinuous surface by reflection and absorption, the rethread lower margin is connected with ground and is discharged, realizes the shielding effect.