CN221929629U - Electromagnetic interference suppression device and motor driver - Google Patents

Abstract

The utility model relates to an electromagnetic interference suppression device and a motor driver, wherein the electromagnetic interference suppression device comprises a printed circuit board, an inverter unit arranged on the printed circuit board, an electromagnetic interference suppression unit, and a motor winding terminal; the printed circuit board is provided with a mounting hole, and the electromagnetic interference suppression unit is arranged in the mounting hole; one end of the electromagnetic interference suppression unit is connected to the output end of the inverter unit, and the other end is connected to the motor winding terminal. The embodiment of the utility model arranges the electromagnetic interference suppression unit between the output end of the inverter unit and the motor winding terminal, and arranges the electromagnetic interference suppression unit on the internal circuit board of the motor driver, so as to effectively suppress high-frequency noise and avoid the wear or falling off of the power output cable.

Description

Electromagnetic interference suppression device and motor driver

Technical Field

The utility model relates to the field of motor driving, in particular to an electromagnetic interference suppression device and a motor driver.

Background Art

Motors are usually driven by motor drive devices such as frequency converters and servo drives. These motor drive devices output AC power of a specific frequency to the stator or rotor winding of the motor to make the motor rotate at a specific speed. In the above motor drivers, the motor carrier frequency, the switching frequency of the switching power supply, and the current sampling clock will generate high-frequency interference in cables, power grids, and space. In order to avoid interference with other equipment, it is usually necessary to set a magnetic ring on the external power output line of the motor driver (the power output line is connected to the motor winding) to increase the common mode inductance and reduce the radiation of high-frequency noise.

However, the magnetic ring on the power output line is outside the motor driver and placed close to the motor driver. In a vibrating environment, its reliability is poor, which often causes the power output line to wear or the terminal connected to the motor driver to fall off. In addition, due to the size, the magnetic ring will affect the overall aesthetics of the power output line and the motor driver.

Utility Model Content

The utility model aims at the problems existing in the related technology and provides an electromagnetic interference suppression device, comprising: a printed circuit board, an inverter unit arranged on the printed circuit board, an electromagnetic interference suppression unit, and a motor winding connection terminal; the printed circuit board is provided with a mounting hole, and the electromagnetic interference suppression unit is arranged in the mounting hole; one end of the electromagnetic interference suppression unit is connected to the output end of the inverter unit, and the other end is connected to the motor winding connection terminal.

Optionally, the electromagnetic interference suppression unit includes a common mode reactor.

Optionally, the common mode reactor includes a magnetic ring and a copper wire wound around the magnetic ring.

Optionally, the shape of the magnetic ring includes any one of circular, rectangular and triangular.

Optionally, the inverter unit includes multiple outputs, the common-mode inductor includes multiple copper wires corresponding to the multiple outputs of the inverter unit, the motor winding connection terminals include multiple connection terminals corresponding to the multiple outputs of the inverter unit, and the multiple outputs of the inverter unit are respectively connected to the multiple connection terminals of the motor winding connection terminals via the multiple copper wires.

Optionally, the electromagnetic interference suppression unit is soldered to the printed circuit board.

Optionally, the electromagnetic interference suppression unit is detachably plugged into the printed circuit board.

Optionally, at least two inverter units, electromagnetic interference suppression units connected to the inverter units in a one-to-one correspondence, and motor winding connection terminals are arranged on the printed circuit board.

The utility model also provides a motor driver, comprising a shell and the electromagnetic interference suppression device as described above in the shell.

Optionally, the motor winding connection terminals of the electromagnetic interference suppression device protrude from the outside of the housing to be connected to an external load.

The embodiment of the utility model provides an electromagnetic interference suppression unit between the output end of the inverter unit and the motor winding terminal, and provides the electromagnetic interference suppression unit on the internal circuit board of the motor driver, thereby effectively suppressing high-frequency noise while avoiding increasing the weight of the power output cable, thereby avoiding wear or falling off of the power output cable. In addition, since the electromagnetic interference suppression unit is provided on the printed circuit board inside the motor driver, the overall aesthetics of the motor driver is improved.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a printed circuit board provided by an embodiment of the utility model;

FIG2 is a schematic diagram of an electromagnetic interference suppression device provided by an embodiment of the utility model;

FIG3 is a schematic structural diagram of a common-mode reactor provided in an embodiment of the utility model.

Description of reference numerals:

1-suppression circuit board, 11-inverter unit, 12-electromagnetic interference suppression unit, 13-motor winding terminal, 14-installation hole, 121-magnetic ring, 122-copper wire.

DETAILED DESCRIPTION

In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

Referring to FIG. 1 and FIG. 2, they are respectively a schematic diagram of a printed circuit board and a schematic diagram of an electromagnetic interference suppression device of an embodiment of the utility model, and the electromagnetic interference suppression device can be applied to a motor driver. The electromagnetic interference suppression device of this embodiment comprises a printed circuit board 1, an inverter unit 11 arranged on the printed circuit board, an electromagnetic interference suppression unit 12, and a motor winding terminal 13; a mounting hole 14 is provided on the printed circuit board, and the electromagnetic interference suppression unit 12 is arranged in the mounting hole 14; one end of the electromagnetic interference suppression unit 12 is connected to the output end of the inverter unit 11, and the other end is connected to the motor winding terminal 13. In this embodiment, the mounting hole 14 is provided on the printed circuit board 1, and the electromagnetic interference suppression unit is arranged at the mounting hole, which can avoid the electromagnetic interference suppression unit from occupying more height space of the printed circuit board due to the excessive height dimension of the printed circuit board, thereby increasing the height space for installing the printed circuit board.

In this embodiment, the inverter unit 11 is composed of a semiconductor switch tube, specifically, the semiconductor switch tube can be an IGBT (Insulated Gate Bipolar Transistor), a MOSFET (Metal-Oxide-SemiconductorField-Effect Transistor), etc. In an example of this embodiment, the inverter unit 11 may include six semiconductor switch tubes, and the six semiconductor switch tubes are connected to form a three-phase inverter bridge through the connecting conductors on the printed circuit board 1. In addition, the input end of the inverter unit 11 is connected to the DC bus, and through the high-frequency switching of the semiconductor switch tube (for example, the switching frequency is 4kHz or 8kHz), the DC power is converted into AC power and then output, and the electromagnetic interference suppression unit 12 connected to the output end of the inverter unit 11 filters out the high-frequency interference (for example, the switching high-frequency interference generated by the semiconductor switch tube) in the AC power output by the inverter unit 11.

The electromagnetic interference suppression device in this embodiment, by setting the electromagnetic interference suppression unit between the output end of the inverter unit and the motor winding terminal, and setting the electromagnetic interference suppression unit on the printed circuit board, can effectively suppress high-frequency noise while avoiding increasing the weight of the power output cable, thereby avoiding the wear or falling off of the power output cable. In addition, since the electromagnetic interference suppression unit is located on the printed circuit board, the overall aesthetics and consistency of the motor driver using the printed circuit board are improved.

In this embodiment, the electromagnetic interference suppression unit includes a common-mode reactor. Specifically, refer to FIG3, which is a schematic diagram of the structure of the common-mode reactor of this embodiment. The common-mode reactor 12 in this embodiment includes a magnetic ring 121 and a copper wire 122 wound around the magnetic ring. The magnetic ring in this embodiment is a circular magnetic ring. It should be understood that in this embodiment, the shape of the magnetic ring is not limited to a circle, but can also be any one of a rectangle and a triangle, and can be flexibly set to a corresponding ring shape according to specific application requirements.

In this embodiment, the inverter unit 11 includes multiple outputs, the common mode reactor includes multiple copper wires 122 corresponding to the multiple outputs of the inverter unit 11, and the motor winding terminal 13 includes multiple terminals corresponding to the multiple outputs of the inverter unit 11, and the multiple outputs of the inverter unit are respectively connected to the multiple terminals of the motor winding terminal via multiple copper wires. In an example of the utility model, in combination with FIG3, the common mode reactor includes a magnetic ring 121 and a plurality of copper coils 122 respectively wound around the magnetic ring. The output end of the inverter unit 11 includes a plurality of output lines (for example, when the inverter unit 11 is a three-phase full-bridge inverter circuit, its output end includes three output lines), and the plurality of output lines of each inverter unit 11 are respectively connected to different end pins of the motor winding terminal via a plurality of copper coils of the common mode reactor, that is, each copper coil of the common mode reactor is connected in series between one end pin of an output line of the inverter unit 11 and one end pin of the motor winding terminal 13. In this way, the common-mode interference in the alternating current output by the inverter unit can be filtered out through the common-mode reactor.

In one example of this embodiment, the electromagnetic interference suppression unit is welded on the printed circuit board, and the electromagnetic interference suppression unit is welded on the circuit board to improve the stability of the electromagnetic interference suppression unit. In another example, the electromagnetic interference suppression unit is detachably plugged into the printed circuit board, and a pin can be set on the electromagnetic interference suppression unit, so that the electromagnetic interference suppression unit can be flexibly plugged and unplugged on the circuit board, which is convenient for the maintenance of the electromagnetic interference suppression unit.

In this embodiment, at least two inverter units, and electromagnetic interference suppression units and motor winding connection terminals connected to the inverter units in a one-to-one correspondence are arranged on the printed circuit board, and the output end of each inverter unit is connected to the motor winding connection terminal via an electromagnetic interference suppression unit. The integration of the electromagnetic interference suppression device of the motor driver can be improved, and the space for using the motor driver can be saved.

This embodiment also provides a motor driver, including a housing and an electromagnetic interference suppression device as in the above embodiment arranged inside the housing, wherein the motor winding connection terminals of the electromagnetic interference suppression device protrude outside the housing to be connected to an external load.

The electromagnetic interference suppression device and the motor driver in this embodiment, by setting the electromagnetic interference suppression unit between the output end of the inverter unit and the motor winding terminal, and setting the electromagnetic interference suppression unit on the printed circuit board, can effectively suppress high-frequency noise while avoiding increasing the weight of the power output cable, thereby avoiding the wear or falling off of the power output cable. In addition, since the electromagnetic interference suppression unit is located on the printed circuit board, the overall aesthetics and consistency of the motor driver using the printed circuit board are improved.

It should be understood that the application of the present invention is not limited to the above examples. For ordinary technicians in this field, improvements or changes can be made according to the above description. All these improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims (10)

1. An electromagnetic interference suppression device, characterized in that it comprises: a printed circuit board, an inverter unit arranged on the printed circuit board, an electromagnetic interference suppression unit, and a motor winding terminal; The printed circuit board is provided with a mounting hole, and the electromagnetic interference suppression unit is arranged in the mounting hole; One end of the electromagnetic interference suppression unit is connected to the output end of the inverter unit, and the other end is connected to the motor winding connection terminal. 2 . The electromagnetic interference suppression device according to claim 1 , wherein the electromagnetic interference suppression unit comprises a common mode inductor. 3 . 3 . The electromagnetic interference suppression device according to claim 2 , wherein the common-mode inductor comprises a magnetic ring and a copper wire wound around the magnetic ring. 4 . The electromagnetic interference suppression device according to claim 3 , wherein the shape of the magnetic ring includes any one of a circle, a rectangle and a triangle. 5. The electromagnetic interference suppression device as described in claim 3 is characterized in that the inverter unit includes multiple outputs, the common-mode inductor includes multiple copper wires corresponding to the multiple outputs of the inverter unit, the motor winding terminal includes multiple wiring terminals corresponding to the multiple outputs of the inverter unit, and the multiple outputs of the inverter unit are respectively connected to the multiple wiring terminals of the motor winding terminal via the multiple copper wires. 6 . The electromagnetic interference suppression device according to claim 1 , wherein the electromagnetic interference suppression unit is soldered to the printed circuit board. 7. The electromagnetic interference suppression device according to any one of claims 1 to 5, characterized in that the electromagnetic interference suppression unit is detachably plugged into the printed circuit board. 8. The electromagnetic interference suppression device according to claim 6, characterized in that at least two inverter units, electromagnetic interference suppression units connected to the inverter units in a one-to-one correspondence, and motor winding connection terminals are arranged on the printed circuit board. 9. A motor driver, comprising a housing and an electromagnetic interference suppression device according to any one of claims 1 to 8 arranged in the housing. 10 . The motor driver according to claim 9 , wherein the motor winding connection terminals of the electromagnetic interference suppression device protrude from the outside of the housing to be connected to an external load.