Circuit structure for protecting motor and inhibiting electromagnetic radiation of motor and motor

Abstract

The utility model discloses a circuit structure for protecting a motor and inhibiting electromagnetic radiation of the motor and the motor, comprising a diode D1 and a diode D2 which are arranged between the positive pole and the negative pole of the motor, the negative poles of the diode D1 and the diode D2 are both connected with the positive pole of the motor, and the positive poles of the diode D1 and the diode D2 are both connected with the negative pole of the motor. The diode D1 and the diode D2 are of a parallel structure, magnetic beads are arranged on the negative electrodes of the diode D1 and the diode D2 respectively, the positive electrode of the motor is connected with the control part, the control part is connected with the positive electrode of the input power source, and the positive electrodes of the diode D1 and the diode D2 and the negative electrode of the motor are connected with the negative electrode of the input power source. The motor protection device has the functions of protecting the motor and inhibiting electromagnetic radiation, so that the motor is not easy to damage.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a circuit structure and a motor for protecting a motor and suppressing electromagnetic radiation of the motor. Background Art

[0002] With the advancement of technology and the improvement of our living standards, more and more electromechanical products appear in our daily lives, such as vacuum cleaners, smart curtains, various power tools, etc., which greatly facilitate our lives. As the core component of electromechanical products, motors are used very frequently, and as a driving mechanism, the motor plays a big role in the performance of the product.

[0003] If there is no effective motor protection measure when electromechanical products are working, the motor will be easily damaged, which will eventually lead to the product not working properly. In addition, when electromechanical products are working, the motor will generate various high-frequency noises (electromagnetic radiation) because the motor is running at high speed. If it is not handled properly, it will not only interfere with the safety of the surrounding electronic equipment, but more seriously, the long-term exposure of users to such electromagnetic radiation environment will seriously affect our physical and mental health.

[0004] Therefore, some structures are also set up in the prior art to protect the motor and suppress the electromagnetic radiation of the motor. However, in the prior art, a diode is usually connected to the winding of the motor to form a parallel circuit. When the motor stops running, the induced electromotive force generated by the motor will cause current to flow in the circuit. At this time, the diode will play a protective role, preventing the current from flowing back into the motor winding, thereby protecting the motor from damage. Although this structure can protect the motor to a certain extent, it cannot suppress electromagnetic radiation. Some have a separate structure for suppressing electromagnetic radiation, but lack protection for the motor, and it is difficult to have both at the same time. Obviously, it can no longer meet the development needs of electromechanical products. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a circuit structure and a motor for protecting a motor and suppressing electromagnetic radiation of the motor.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A circuit structure for protecting a motor and suppressing electromagnetic radiation of the motor comprises a diode D1 and a diode D2 arranged between the positive and negative ends of the motor, wherein the negative electrodes of the diode D1 and the diode D2 are both connected to the positive electrode of the motor, the positive electrodes of the diode D1 and the diode D2 are both connected to the negative electrode of the motor, the diode D1 and the diode D2 are in a parallel structure, the negative electrodes of the diode D1 and the diode D2 are respectively provided with magnetic beads, the positive electrode of the motor is connected to a control component, the control component is connected to the positive electrode of an input power supply, and the positive electrodes of the diode D1 and the diode D2 and the negative electrode of the motor are connected to the negative electrode of the input power supply.

[0008] As a further improved structure, the magnetic beads are ferrite bead filters.

[0009] As a further improved structure, a through hole is provided in the magnetic bead, and the cathodes of the diode D1 and the diode D2 pass through the through hole of the magnetic bead and are fastened.

[0010] As a further improved structure, at least one magnetic bead is installed at the cathode of the diode D1 and the cathode of the diode D2 respectively.

[0011] As a further improved structure, when more than two magnetic beads are respectively installed on the cathodes of the diode D1 and the diode D2, the magnetic beads are arranged at intervals.

[0012] As a further improved structure, the parameter specifications of the diode D1 and the diode D2 remain the same.

[0013] As a further improved structure, the magnetic bead and the diodes D1 and D2 are interference fit.

[0014] As a further improved structure, the magnetic beads and the diodes D1 and D2 are fixed by adhesive.

[0015] As a further improved structure, the control element includes a field effect transistor Q1, the gate of which is connected to the PWM control signal, the source of which is connected to the positive electrode of the motor, and the drain of which is connected to the positive electrode of the input power supply.

[0016] A motor includes a PCB board, wherein the PCB board is provided with an electromagnetic radiation suppression circuit structure, wherein the cathodes of the diodes D1 and D2 are covered with magnetic beads, and then the diodes D1 and D2 are welded on the PCB board, and a field effect transistor Q1 is welded on the PCB board, and the diodes D1 and D2 are connected in parallel between the positive and negative ends of the motor through a circuit layer on the PCB board.

[0017] Compared with the prior art, the utility model has the following beneficial technical effects:

[0018] By connecting diodes D1 and D2 in parallel between the positive and negative ends of the motor, a low-impedance closed-loop path is provided. When the motor is powered off or suddenly stops running, the coil will instantly release electrical energy. This path can quickly release this electrical energy (back electromotive force) to prevent the reverse current generated by this electrical energy (back electromotive force) from impacting the motor and damaging or even burning the motor, thereby effectively protecting the motor.

[0019] By setting the magnetic beads on the diode D1 and the diode D2, when the current flows through the ferrite beads, the magnetic beads show inductance characteristics at low frequencies, and the current loss is very small; at high frequencies, the magnetic beads show resistance characteristics and the resistance component increases with the increase of frequency, and the current loss is large. By utilizing the resistance characteristic of the magnetic beads at high frequencies, the magnetic beads are put on the negative electrode of the diode to absorb the high-frequency noise (electromagnetic radiation) generated by the high-speed operation of the motor in a wide frequency range, and dissipate the high-frequency noise (electromagnetic radiation) generated by the operation of the motor in the form of heat, thereby achieving the effect of effectively suppressing electromagnetic radiation.

[0020] The diodes and magnetic beads used are relatively cheap, and the overall manufacturing cost is low. It can be widely used in various electromechanical products and equipment. According to the working voltage, current, and motor noise frequency of electromechanical products, the diodes and magnetic beads with corresponding parameters can be flexibly selected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the circuit connection of the utility model;

[0022] Figure 2 This is a schematic diagram of the assembly structure of the magnetic beads in the utility model;

[0023] Figure 3 It is a schematic diagram of the structure of the circuit structure of the utility model assembled on a PCB board.

[0024] Reference numerals:

[0025] Magnetic bead 1, diode 2, PCB board 3. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present utility model, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like are involved, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0028] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] Embodiment 1

[0030] refer to Figure 1 and 2 As shown, a circuit structure for protecting a motor and suppressing electromagnetic radiation of the motor includes a diode D1 and a diode D2 arranged between the positive and negative ends of the motor, wherein the negative electrodes of the diode D1 and the diode D2 are both connected to the positive electrode of the motor, the positive electrodes of the diode D1 and the diode D2 are both connected to the negative electrode of the motor, the diode D1 and the diode D2 are in a parallel structure, the negative electrodes of the diode D1 and the diode D2 are respectively equipped with magnetic beads, the positive electrode of the motor is connected to the control component, the control component is connected to the positive electrode of the input power supply, the positive electrodes of the diode D1 and the diode D2 and the negative electrode of the motor are connected to the negative electrode of the input power supply, the control component receives a control signal and performs on-off control, and the magnetic beads are ferrite magnetic bead filters. The diode D1 and the diode D2 form a parallel structure with the motor, and can fully play a protective role through the parallel arrangement of the two electrode tubes.

[0031] The motor is protected by diode D1 and diode D2 as follows:

[0032] The motor has a coil inside, which is an inductive element, and the current of an inductive element cannot change suddenly. When the motor is powered off or stops running suddenly, the coil will instantly release electric energy, which is the back electromotive force. If the back electromotive force cannot be released or consumed in time, it will damage the motor and other components in the circuit. By connecting diodes D1 and D2 in parallel at the positive and negative ends of the motor, a low-impedance closed-loop path is formed. This path can quickly release these back electromotive forces, preventing the reverse current generated by these back electromotive forces from impacting the motor and damaging or even burning the motor, thereby protecting the motor.

[0033] By directly setting magnetic beads on the cathode of diodes D1 and D2, the current first passes through the magnetic beads and then enters the inside of the diode. When current flows through the ferrite magnetic beads, the magnetic beads show inductance characteristics at low frequencies, and the current loss is very small; at high frequencies, the magnetic beads show resistance characteristics and the resistance component increases with the increase of frequency, and the current loss is large. By utilizing the resistance characteristics of the magnetic beads at high frequencies, the magnetic beads can be placed on the cathode of the diode to absorb the high-frequency noise (electromagnetic radiation) generated by the high-speed operation of the motor in a wide frequency range, and dissipate the high-frequency noise (electromagnetic radiation) generated by the operation of the motor in the form of heat, thereby achieving the effect of effectively suppressing electromagnetic radiation.

[0034] Embodiment 2

[0035] refer to Figure 1 and 2 As shown, a circuit structure for protecting a motor and suppressing electromagnetic radiation of a motor includes a diode D1 and a diode D2 arranged between the positive and negative ends of the motor, wherein the negative poles of the diode D1 and the diode D2 are both connected to the positive pole of the motor, the positive poles of the diode D1 and the diode D2 are both connected to the negative pole of the motor, the diode D1 and the diode D2 are in a parallel structure, the negative poles of the diode D1 and the diode D2 are respectively equipped with magnetic beads, the positive pole of the motor is connected to the control part, the control part is connected to the positive pole of the input power supply, the positive poles of the diode D1 and the diode D2 and the negative pole of the motor are connected to the negative pole of the input power supply, the control part receives the control signal and performs on-off control, and the magnetic beads are ferrite magnetic bead filters. When assembling the magnetic bead 1, a through hole can be set in the magnetic bead 1, and then the magnetic bead is set on the diode D1 and the diode D2, and the magnetic bead is fixed to the negative pole pin of the diode by adhesive to ensure the stability of the magnetic bead assembly. Of course, the glue used here can be glue with a certain temperature resistance. Figure 2 In the figure, it is defined as diode 2, which can represent diode D1 or diode D2, and is a schematic diagram of the assembly of diode 2 and magnetic bead 1.

[0036] The use of the installation structure of the set also reduces the difficulty of assembly. No external tools are needed. The magnetic bead can be inserted along the negative pole of the diode manually, and then glue can be dripped into the through hole between the magnetic bead and the diode to fix the diode.

[0037] Of course, when certain electrodes or current processing requirements are large, multiple magnetic beads can also be set, such as two magnetic beads are set on the cathode of diode D1, and two magnetic beads are also set on the cathode of diode D2. The two magnetic beads are separated by a certain distance to form an interval distribution, that is, the structural relationship of the two magnetic beads connected in series can further absorb the generated electromagnetic radiation. In the test, setting a magnetic bead at the cathode of a diode can basically completely absorb the generated electromagnetic radiation. At this time, setting a magnetic bead can meet the requirements of suppressing electromagnetic radiation and can reduce assembly costs.

[0038] The parameter specifications of diode D1 and diode D2 remain the same to form consistency. The number of magnetic beads assembled on diode D1 and diode D2 remains the same.

[0039] In a preferred embodiment, it is preferred to set the same number of magnetic beads on the diode D1 and the diode D2 to maintain structural consistency, and the models of the magnetic beads are the same.

[0040] In addition, the control element includes a field effect tube Q1, the gate of which is connected to the PWM control signal, the source of which is connected to the positive electrode of the motor, and the drain of which is connected to the positive electrode of the input power supply. The motor is controlled on and off by the field effect tube Q1.

[0041] Embodiment 3

[0042] refer to Figure 1-3As shown, a motor includes a PCB board 3, on which an electromagnetic radiation suppression circuit structure is provided, the electromagnetic radiation circuit structure includes a diode D1 and a diode D2 arranged between the positive and negative ends of the motor, wherein the negative electrodes of the diode D1 and the diode D2 are both connected to the positive electrode of the motor, the positive electrodes of the diode D1 and the diode D2 are both connected to the negative electrode of the motor, the diode D1 and the diode D2 are in a parallel structure, the negative electrodes of the diode D1 and the diode D2 are respectively equipped with magnetic beads, the positive electrode of the motor is connected to the control component, the control component is connected to the positive electrode of the input power supply, the positive electrodes of the diode D1 and the diode D2 and the negative electrode of the motor are connected to the negative electrode of the input power supply, the control component receives a control signal and performs on-off control, and the magnetic beads are ferrite bead filters. After the cathodes of the diodes D1 and D2 are fitted with the magnetic beads 1, the diodes D1 and D2 are welded on the PCB board, the field effect transistor Q1 is welded on the PCB board 3, and the diodes D1 and D2 are connected in parallel between the positive and negative ends of the motor through the circuit layer on the PCB board 3.

[0043] When distributed on the PCB board, the diode D1 and the diode D2 are welded and fixed side by side, the field effect tube Q1 can be welded on one side of the diode D1, and then the circuit layer inside the PCB board is used to achieve electrical conduction. The motor is controlled through the PCB board.

[0044] Positive pins and negative pins are set on the PCB board, which are also connected to the positive and negative poles of the motor. By adding markings, the connection difficulty is reduced and the technical ability requirements for the assembler are reduced.

[0045] The above motor structure can be applied to various types of electromechanical equipment to improve the motor quality and extend the service life of the motor.

[0046] The diodes and magnetic beads used in the utility model are all common electronic components. It is only necessary to flexibly select diodes and magnetic beads with corresponding parameters according to the working voltage, current and motor noise frequency of the electromechanical products. The cost is low and the assembly is relatively easy.

[0047] Different types of motors generate different noises. For example, different motor powers generate different electromagnetic radiation and back electromotive force during operation. In this case, it is necessary to adjust the types of diodes and magnetic beads to ensure that the back electromotive force generated can be fully eliminated and the electromagnetic radiation can be absorbed. Therefore, in the present invention, there is no specific limitation on the selection of diodes and magnetic beads, but they can be flexibly selected according to the type of motor used.

[0048] In the utility model, the dual functions of protecting the motor and suppressing electromagnetic radiation are achieved. Two parallel diodes are used to eliminate the back electromotive force, thereby protecting the motor. The resistance characteristic of the magnetic beads at high frequencies is used to absorb the electromagnetic radiation generated when the motor runs at high speed, and dissipate it in the form of heat, thereby suppressing electromagnetic radiation.

[0049] It should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A circuit structure for protecting a motor and suppressing the electromagnetic radiation of the motor, characterized in that: It comprises a diode D1 and a diode D2 which are arranged between the positive and negative ends of the motor, wherein the negative electrodes of the diode D1 and the diode D2 are both connected to the positive electrode of the motor, the positive electrodes of the diode D1 and the diode D2 are both connected to the negative electrode of the motor, the diode D1 and the diode D2 are in a parallel structure, the negative electrodes of the diode D1 and the diode D2 are respectively provided with magnetic beads, the positive electrode of the motor is connected to the control component, the control component is connected to the positive electrode of the input power supply, the positive electrodes of the diode D1 and the diode D2 and the negative electrode of the motor are connected to the negative electrode of the input power supply.

2. The circuit structure for protecting a motor and suppressing electromagnetic radiation of a motor according to claim 1, characterized in that: The magnetic beads are ferrite bead filters.

3. The circuit structure for protecting a motor and suppressing electromagnetic radiation of a motor according to claim 2, characterized in that: The magnetic bead is provided with a through hole, and the cathodes of the diode D1 and the diode D2 pass through the through hole of the magnetic bead and are fastened.

4. The circuit structure for protecting a motor and suppressing electromagnetic radiation of a motor according to claim 2, characterized in that: At least one magnetic bead is installed at the cathode of the diode D1 and the cathode of the diode D2 respectively.

5. The circuit structure for protecting a motor and suppressing electromagnetic radiation of a motor according to claim 4, characterized in that: When two or more magnetic beads are respectively installed on the cathodes of the diode D1 and the diode D2, the magnetic beads are arranged at intervals.

6. The circuit structure for protecting a motor and suppressing electromagnetic radiation of a motor according to claim 1, characterized in that: The parameter specifications of the diode D1 and the diode D2 remain the same.

7. The circuit structure for protecting a motor and suppressing electromagnetic radiation of a motor according to claim 1, characterized in that: The magnetic beads are tightly fitted with the diodes D1 and D2.

8. The circuit structure for protecting a motor and suppressing electromagnetic radiation of a motor according to claim 1, characterized in that: The magnetic beads are fixed to the diodes D1 and D2 by adhesive.

9. The circuit structure for protecting a motor and suppressing electromagnetic radiation of a motor according to claim 1, characterized in that: The control element comprises a field effect tube Q1, a gate of the field effect tube Q1 is connected to a PWM control signal, a source of the field effect tube Q1 is connected to a positive electrode of the motor, and a drain of the field effect tube Q1 is connected to a positive electrode of an input power supply.

10. A motor, comprising a PCB board, characterized in that: The PCB board is provided with a circuit structure as described in any one of claims 1 to 9. After the cathodes of the diodes D1 and D2 are fitted with magnetic beads, the diodes D1 and D2 are welded on the PCB board, and the field effect transistor Q1 is welded on the PCB board. The diodes D1 and D2 are connected in parallel between the positive and negative ends of the motor through the circuit layer on the PCB board.

Images