High-reliability interference suppression assembly for direct current motor

Abstract

The high-reliability interference suppression assembly comprises a shell, a cover plate, a printed board and an electronic component, the annular shell is provided with an annular inner cavity with an opening at one end, the annular printed board is arranged in the annular inner cavity, the annular cover plate is arranged at the opening end of the annular inner cavity, and the electronic component is arranged in the annular inner cavity. The electronic component comprises a plurality of chip resistors and a plurality of chip capacitors which are respectively mounted on the printed board, the annular inner cavity is filled with heat-conducting sealant, the printed board, the chip resistors and the chip capacitors are wrapped by the heat-conducting sealant, the two leads are respectively mounted on the cover plate through insulators, and the cover plate is connected with the open end of the shell in a welding manner. According to the utility model, the overall size of the assembly is reduced, the heating value is reduced, other heat dissipation devices are not needed, the size and the mass of the assembly are obviously reduced, the assembly can be conveniently, stably and reliably installed on the rotor of the direct current motor, and stable operation can be ensured when the rotation speed of the rotor is relatively high.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of accessory components of direct current motor, especially a kind of high reliable interference suppression component for direct current motor. BACKGROUND

[0002] Direct current motor is driven mechanical device movement by direct current power supply to provide electric energy, during the operation of direct current motor, the direct current voltage provided by rectifier circuit is not completely stable, possibly with stray high frequency signals such as reverse voltage, these stray signals can interfere with the normal operation of motor, therefore, interference suppression component needs to be installed on direct current motor to ensure that motor can stably operate.

[0003] Traditional interference suppression component for direct current motor generally uses single resistance, and reverse electromotive force is guided into single high-power plug-in resistance, or transient suppression protection element (TVS tube or voltage-dependent resistor) is used, and shell generally uses screw locking, and this traditional interference suppression component has the following defects:

[0004] Single resistance or transient suppression protection element needs to use large-size and high-power element, resulting in large overall volume of the whole component, shell uses screw locking, which can further increase volume, resulting in that interference suppression component is difficult to stably and reliably install on rotor of direct current motor, and there is risk of falling when rotor rotates at high speed, and at the same time, single resistance or transient suppression protection element has large heat output for high-voltage direct current motor, and needs to offset reverse voltage through heat dissipation device, which can further increase product volume and weight, and easily lead to heat damage.

[0005] In addition, the insulation performance, high temperature and high pressure corrosion resistance of traditional interference suppression component is poor, and it is difficult to be reliably used in harsh environment of high temperature, high pressure and corrosion. UTILITY MODEL CONTENTS

[0006] The utility model aims at solving the above problems and provides a high reliable interference suppression component for direct current motor, which has small volume, small heat output and is easy to install.

[0007] The utility model realizes the above-mentioned purposes by the following technical solutions:

[0008] A high-reliability interference suppression assembly for a direct current motor, comprising a shell, a cover plate, a printed board installed in the shell, and electronic components installed on the printed board, two leads respectively passing through corresponding through holes on the cover plate, inner ends of the two leads being respectively connected to corresponding electronic components, the shell being circular ring-shaped and provided with a circular ring-shaped inner cavity with an open end, the printed board being circular ring-shaped and being placed in the circular ring-shaped inner cavity, the cover plate being circular ring-shaped and being installed on the open end of the circular ring-shaped inner cavity, the electronic components comprising a plurality of chip resistors and a plurality of chip capacitors respectively installed on the printed board, the circular ring-shaped inner cavity being filled with heat-conducting sealing glue which covers the printed board, the plurality of chip resistors, and the plurality of chip capacitors, the two leads being respectively installed on the cover plate through insulators, and the cover plate being welded to the open end of the shell. The specific series-parallel connection structure between the plurality of chip resistors and the plurality of chip capacitors is determined according to actual needs and is not specifically limited here.

[0009] As a preference, in order to facilitate stable and reliable installation of the assembly on the rotor of the direct current motor and prevent circumferential movement thereof, a strip-shaped groove is provided on the hole wall of the central through hole of the shell, and the length direction of the strip-shaped groove is the same as the axial direction of the shell.

[0010] As a preference, in order to better prevent circumferential movement of the assembly on the rotor of the direct current motor, the strip-shaped groove comprises a square groove with a square radial cross section and two circular arc-shaped grooves with a circular arc-shaped radial cross section.

[0011] As a preference, in order to increase the creepage distance between two electrodes of the electronic components to improve the interference suppression effect, a groove is provided on the side surface of the printed board for installing the electronic components at a position between the two electrodes of the electronic components.

[0012] As a preference, in order to make the assembly have the characteristics of wear resistance, high temperature resistance, high pressure resistance, and overhead resistance so as to be reliably used in harsh environments such as high temperature, high pressure, and corrosion, the shell is an aluminum shell, the cover plate is an aluminum cover plate, the outer wall surface and the inner wall surface of the shell and the cover plate are provided with an insulating oxide layer, the insulating oxide layer on the inner wall surface of the shell and the cover plate is further coated with an insulating finish, the insulating oxide layer on the outer wall surface of the shell and the cover plate is further coated with a magnesium alloy finish, and the printed board is a polyimide board.

[0013] As a preference, in order to more reliably install the printed board and ensure good insulation performance between the printed board and the shell, the printed board is installed in the circular ring-shaped inner cavity through polyether ether ketone screws and polyether ether ketone washers.

[0014] As a preference, in order to realize the surge protection function while realizing the interference suppression function, the chip resistor comprises a chip power resistor and a chip voltage-dependent resistor.

[0015] The utility model discloses the beneficial effect lies in:

[0016] The utility model discloses a circular shell can be directly fitted on the rotor of the direct current motor, a plurality of chip resistors and a plurality of chip capacitors are used as electronic components, small size chip type low power electronic components are used to achieve the required power through series and parallel connection, thereby reducing the overall volume of the component and the heat dissipation, and other heat dissipation devices are not required in the heat dissipation through the heat-conducting sealant, the volume and mass of the component are obviously reduced, the component can be stably and reliably installed on the rotor of the direct current motor, stable operation can be ensured when the rotor rotates at a high speed, and the risk of damage of the electronic components caused by high heat is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the explosion perspective view of the high reliable interference suppression assembly for direct current motor before assembly of the utility model;

[0018] Figure 2 It is the perspective view of the high reliable interference suppression assembly for direct current motor after assembly of the utility model. DETAILED DESCRIPTION

[0019] The utility model is further described below with reference to the drawings:

[0020] As Figure 1 And Figure 2As shown, the high-reliability interference suppression assembly for the direct current motor includes a shell 10, a cover plate 3, a printed board 7 installed in the shell 10, and electronic elements installed on the printed board 7, two lead wires 1 respectively passing through corresponding through holes 2 on the cover plate 3, inner ends of the two lead wires 1 being respectively connected with the electronic elements, the circular shell 10 being provided with a circular inner cavity 11 with one end being opened, the circular printed board 7 being arranged in the circular inner cavity 11, the circular cover plate 3 being installed at the opening end of the circular inner cavity 11, the electronic elements including a plurality of patch resistors (referring to the following patch power resistor 8 and patch voltage-dependent resistor 9) and a plurality of patch capacitors 5 which are respectively installed on the printed board 7, the circular inner cavity 11 being filled with heat-conducting sealing glue (not shown in the figure but easy to understand) and the heat-conducting sealing glue covering the printed board 7, the plurality of patch resistors and the plurality of patch capacitors 5, the two lead wires 1 being respectively installed on the cover plate 3 through insulators 4, and the cover plate 3 being welded and connected with the opening end of the shell 10. The specific series-parallel connection structure between the plurality of patch resistors and the plurality of patch capacitors 5 is determined according to actual needs and is not specifically limited here.

[0021] As shown in Figure 1 and Figure 2 The utility model discloses the following multiple more optimal specific structure:

[0022] In order to facilitate the stable and reliable installation of the assembly on the rotor of the direct current motor and prevent the circumferential movement, a strip-shaped groove is arranged on the hole wall of the central through hole of the shell 10, and the length direction of the strip-shaped groove is the same as the axial direction of the shell 10.

[0023] In order to better prevent the circumferential movement of the assembly on the rotor of the direct current motor, the strip-shaped groove includes a square groove 12 with a square radial section and two circular-arc-shaped grooves 13 with a circular-arc-shaped radial section.

[0024] In order to increase the creepage distance between the two electrodes of the electronic elements and improve the interference suppression effect, a groove 6 is arranged on the side surface of the printed board 7 for installing the electronic elements and located between the two electrodes of the electronic elements.

[0025] In order to make the assembly have the characteristics of wear resistance, high-temperature resistance, high-pressure resistance, and overhead resistance so as to be reliably used in harsh environments such as high temperature, high pressure, and corrosion, the shell 10 is an aluminum shell, the cover plate 3 is an aluminum cover plate, the outer wall surface and the inner wall surface of the shell 10 and the cover plate 3 are provided with an insulating oxide layer, the insulating oxide layer on the inner wall surface of the shell 10 and the cover plate 3 is further coated with an insulating finish, the insulating oxide layer on the outer wall surface of the shell 10 and the cover plate 3 is further coated with a magnesium alloy finish, and the printed board 7 is a polyimide board.

[0026] In order to more reliably install the printed board 7 and ensure that it has good insulation performance with the shell 10, the printed board 7 is installed in the circular annular inner cavity through polyether ether ketone screws (not shown in the figure) and polyether ether ketone washers (not shown in the figure).

[0027] In order to realize the surge prevention function while realizing the interference suppression function, the chip resistor comprises a chip power resistor 8 and a chip voltage-dependent resistor 9.

[0028] As shown in Figure 1 and Figure 2 In use, the assembly is sleeved on a rotor (not shown in the figure) of a direct current motor through the central through hole of the shell 10, and the convex strips on the rotor are arranged in the square groove 12 and the circular arc groove 13, the shell 10 is connected with the rotor in an expansion interference manner, and the shell 10 and the rotor are stably and reliably connected without screws, even if the rotor rotates at high speed, the assembly will not be separated from the rotor and will not relatively rotate, and the application is facilitated.

[0029] The above embodiments are only preferred embodiments of the present application, and are not a limitation on the technical scheme of the present application, and as long as a technical scheme can be realized on the basis of the above embodiments without creative labor, it should be considered to fall within the protection scope of the patent of the present application.

Claims

1. A high-reliability interference suppression component for a DC motor, comprising a housing, a cover plate, a printed circuit board mounted within the housing, and electronic components mounted on the printed circuit board, wherein two leads pass through corresponding through holes in the cover plate, and the inner ends of the two leads are respectively connected to the electronic components, characterized in that: The outer shell is circular ring-shaped, and is provided with a circular ring-shaped inner cavity with an open end. The printed board is circular ring-shaped and is arranged in the circular ring-shaped inner cavity. The cover plate is circular ring-shaped and is arranged at the open end of the circular ring-shaped inner cavity. The electronic components include a plurality of patch resistors and a plurality of patch capacitors which are respectively arranged on the printed board. The circular ring-shaped inner cavity is filled with heat-conducting sealant which covers the printed board, the plurality of patch resistors and the plurality of patch capacitors. Two lead wires are respectively arranged on the cover plate through insulators. The cover plate is welded to the open end of the outer shell.

2. A high-reliability noise-suppression assembly for a DC motor according to claim 1, characterized in that: The outer shell is provided with a strip-shaped groove on the wall of the central through hole, and the length direction of the strip-shaped groove is the same as the axial direction of the outer shell.

3. The high reliability disturbance rejection assembly for a DC motor of claim 2, wherein: The strip-shaped groove includes a square-shaped groove with a square-shaped radial cross section and two circular arc-shaped grooves with a circular arc-shaped radial cross section.

4. A high-reliability noise-suppression assembly for a DC motor according to any one of claims 1-3, characterized in that: The printed board is provided with a groove at a position between two electrodes of the electronic components on one side surface of the printed board.

5. A high-reliability noise-suppression assembly for a DC motor according to any one of claims 1-3, characterized in that: The outer shell is an aluminum shell, and the cover plate is an aluminum cover plate. The outer wall surface and the inner wall surface of the outer shell and the cover plate are provided with an insulating oxide layer. The insulating oxide layer on the inner wall surface of the outer shell and the cover plate is further coated with an insulating finish. The insulating oxide layer on the outer wall surface of the outer shell and the cover plate is further coated with a magnesium alloy finish. The printed board is a polyimide board.

6. The high reliability disturbance rejection assembly for a DC motor of claim 5, wherein: The printed board is arranged in the circular ring-shaped inner cavity through polyether ether ketone screws and polyether ether ketone gaskets.

7. A high-reliability noise-suppression assembly for a DC motor according to any one of claims 1-3, characterized in that: The patch resistors include patch power resistors and patch piezoresistors.

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