Anti-electromagnetic coupling interference device for fan with metal outer frame

Abstract

The invention discloses an electromagnetic coupling interference resisting device of a metal outer frame fan. The electromagnetic coupling interference resisting device for the metal outer frame fan comprises a Y capacitor, a motor driving power supply circuit and a motor stator coil holder, one end of the Y capacitor is electrically connected with the negative electrode of the motor driving power supply circuit; and the other end of the Y capacitor is electrically connected with the motor stator coil holder. The problem of electromagnetic coupling interference on other electronic equipment when a metal outer frame fan is powered on is solved.

Description

Technical Field

[0001] This invention relates to the technical field of fan equipment, and in particular to an anti-electromagnetic coupling interference device for a metal frame fan. Background Technology

[0002] Fans are commonly used in electronic devices for functions such as heat dissipation. In fans with metal frames, the motor coils (windings) generate a rotating magnetic field when energized. This rotating magnetic field couples with the metal frame, making it energized. Other electronic components in the device that are connected to the metal frame may experience electromagnetic coupling interference, such as affecting the sensitivity of a touchscreen.

[0003] In existing technologies, large-size and high-speed fans use metal frames because metal frames are harder than plastic and less prone to deformation, making them suitable for large electronic devices. Existing fans with metal frames use three-phase motors, which are susceptible to electromagnetic interference. Current technology addresses this by directly connecting the motor's lead frame (made of silicon steel sheets) to the negative terminal of the fan drive board with a wire. However, when the metal frame shares a ground with large electronic equipment, this solution could easily lead to a short circuit if the enameled wire is damaged, posing a safety hazard. Summary of the Invention

[0004] To overcome one or more technical problems existing in the prior art, the present invention provides an anti-electromagnetic coupling interference device for metal frame fans, which solves the problem of electromagnetic coupling interference to other electronic devices when metal frame fans are powered on.

[0005] The technical solution provided by this invention is as follows.

[0006] An electromagnetic coupling interference suppression device for a metal frame fan includes a Y capacitor, a motor drive power supply circuit, and a motor stator frame. One end of the Y capacitor is electrically connected to the negative terminal of the motor drive power supply circuit. The other end of the Y capacitor is electrically connected to the motor stator frame.

[0007] In a preferred embodiment of the present invention, the Y capacitor is disposed on the circuit board corresponding to the motor drive power supply circuit.

[0008] More preferably, the other end of the Y capacitor is electrically connected to the motor stator frame via a wire led out from the circuit board.

[0009] More preferably, the motor stator frame is provided with contacts, which are soldered to the other end of the Y capacitor.

[0010] More preferably, the contacts on the motor stator frame are located on the side of the motor stator frame that is relatively close to the circuit board.

[0011] In a preferred embodiment of the present invention, multiple Y capacitors are provided.

[0012] A preferred embodiment of the present invention further includes an interference signal detection module; The interference signal detection module is electrically connected to the Y capacitor; The interference signal detection module is used to detect noise signals passing through the Y capacitor.

[0013] More preferably, it also includes a motor input adjustment module; The interference signal detection module is electrically connected to the motor input adjustment module, and the motor input adjustment module is electrically connected to the motor drive power supply circuit. The motor input adjustment module is used to adjust the output current of the motor drive power supply circuit according to the noise signal.

[0014] In a further preferred embodiment, the interference signal detection module is connected in parallel with the Y capacitor to detect the voltage across the Y capacitor.

[0015] In a further preferred embodiment, when the motor input adjustment module detects an increase in the voltage on the Y capacitor, it controls the motor drive power supply circuit to reduce the current output to the motor.

[0016] Compared with existing technologies, the method, system, application, computer equipment, and storage medium for generating SQL statements based on natural language of the present invention have the following advantages: they solve the problem of electromagnetic coupling interference to other electronic devices when the motor coil of a metal frame fan is energized, while avoiding the safety hazards that may cause the fan to break down due to existing technologies. Attached Figure Description

[0017] Figure 1 This is a frame structure diagram of one of the metal frame fan anti-electromagnetic coupling interference devices of the present invention.

[0018] Figure 2 This is an exploded side view structural diagram of a metal frame fan in the prior art.

[0019] exist Figure 2 In the diagram, the labels and their corresponding relationships are as follows: 1-fan blade, 2-motor mover magnetic ring, 3-spring, 4-upper ball bearing, 5-motor stator wire frame, 6-circuit board, 7-metal outer frame, 8-lower ball bearing, 9-fastening ring. Detailed Implementation

[0020] Please refer to the diagrams, where the same component symbols represent the same components. The principles of the invention are illustrated by way of example implemented in a suitable operating environment. The following description is based on the illustrative specific embodiments of the invention and should not be construed as limiting the invention to other specific embodiments not detailed herein.

[0021] As used herein, the term "preferred" is meant as an example, illustration, or illustration. Any aspect or design described herein as "preferred" need not be construed as being more advantageous than other aspects or designs. Rather, the use of the term "preferred" is intended to present the concept in a specific manner. As used in this application, the term "or" is intended to mean an inclusive "or" rather than an exclusionary "or." That is, unless otherwise specified or clear from the context, "X uses A or B" naturally includes either of the permutations. That is, if X uses A; X uses B; or X uses both A and B, then "X uses A or B" is satisfied in any of the foregoing examples.

[0022] Although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art based on a reading and understanding of this specification and drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the appended claims. In particular, with respect to the various functions performed by the aforementioned components (e.g., elements, resources, etc.), the terminology used to describe such components is intended to correspond to any component (unless otherwise indicated) that performs the specified function of said component (e.g., is functionally equivalent to it), even if structurally not equivalent to the disclosed structure performing the functions of the exemplary implementations of this disclosure shown herein. Furthermore, although specific features of this disclosure have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations that may be desirable and advantageous for a given or particular application. Moreover, with regard to the use of the terms “comprising,” “having,” “containing,” or variations thereof in the Detailed Description or claims, such terms are intended to be included in a manner similar to the term “including.”

[0023] Please refer to Figure 1 and Figure 2 . Reference Figure 2In existing metal-framed fans, the motor rotor magnetic ring 2 drives the fan blade 1 to rotate by being fitted inside the fan blade 1. The lower end of the fan blade 1's shaft is movably connected to the upper ball bearing after being fitted with the spring 3. The upper ball bearing 4 is located at the center of the upper side of the motor stator frame 5. The lower ball bearing 8 is symmetrical to the upper ball bearing 4 and is fixedly connected to the center of the lower side of the motor stator frame 5. The circuit board 6 is located relatively close to the lower side of the motor stator frame 5, and the shape of the circuit board 6 needs to avoid the center of the lower side of the motor stator frame 5. The shape of the circuit board 6 is usually set as a ring. The retaining ring 9 is used to movably connect the lower end of the fan blade 1's shaft to the lower ball bearing 8. The motor stator frame 5 is also fitted inside the fan blade 1 in a corresponding manner, just like the motor rotor magnetic ring 2. The motor stator frame 5 is used to set multiple windings to drive the motor rotor magnetic ring 2. The motor stator frame 5 is fixedly connected to the metal frame 7. Usually, plastic connectors can be used to fix the motor stator frame 5 to the metal frame 7. In existing metal-frame fans, when powered on, the windings on the motor stator frame 5 generate a magnetic field, driving the motor rotor magnetic ring 2 to rotate. However, since the motor stator frame 5 is often made of silicon steel sheets, the rotating magnetic field couples to the metal frame 7, making the metal frame charged. If the negative terminal of the fan power supply is directly connected to the motor stator frame 5 with a wire, and since the metal frame 7 often shares a ground with other circuit components in large electronic devices, damage to the enameled wire could very likely cause a short circuit in the fan. The electromagnetic coupling interference suppression device for metal-frame fans provided in this embodiment... Figure 2 It is an improvement based on the one shown.

[0024] In the existing technology, Y capacitors are safety capacitors defined according to the IEC60384-14 standard. Y capacitors usually have two non-polarized leads. Y capacitors are often used to suppress common-mode noise interference in circuits. In three-phase motors, the motor frame and coil (i.e., winding) are often used as the stator and the magnetic ring is used as the mover.

[0025] like Figure 1 As shown, the anti-electromagnetic coupling interference device for the metal frame fan in this embodiment includes a Y capacitor, a motor drive power supply circuit, a motor stator frame, an interference signal detection module, and a motor input adjustment module.

[0026] The Y capacitor is located on the circuit board corresponding to the motor drive power supply circuit, and can be found at... Figure 2In circuit board 6, one end of the Y capacitor is electrically connected to the negative terminal of the motor drive power supply circuit, and the other end is electrically connected to the motor stator frame. The other end of the Y capacitor is electrically connected to the motor stator frame via a lead wire from the circuit board. After the motor stator frame is connected to the negative terminal of the motor drive power supply circuit via the Y capacitor, excess magnetic field generated on the motor stator frame can be released through the negative terminal of the motor drive power supply circuit, thus preventing electromagnetic signals that interfere with other circuit components from coupling onto the metal frame. The motor stator frame has contacts that are soldered to the other end of the Y capacitor. The position of the contacts can correspond to... Figure 2 The lower side of the stator winding frame 5 or the side of the T-shaped structure facing the motor mover magnetic ring 2. Preferably, in this embodiment, the contacts are located on the side of the stator winding frame closest to the circuit board, that is, corresponding to... Figure 2 The lower side of the stator frame 5 of the motor. In other embodiments, multiple Y capacitors may be provided, and the multiple Y capacitors may be connected in parallel and / or in series with each other. In this embodiment, it is preferred to provide one Y capacitor. The motor drive power supply circuit is used to output the alternating current that drives the motor to rotate.

[0027] The interference signal detection module is electrically connected to the Y capacitor; it detects noise signals passing through the Y capacitor. The interference signal detection module is also electrically connected to the motor input adjustment module, which in turn is electrically connected to the motor drive power supply circuit; the motor input adjustment module adjusts the output current of the motor drive power supply circuit based on the noise signal. The interference signal detection module is connected in parallel with the Y capacitor to detect the voltage signal across it. Both the interference signal detection module and the motor input adjustment module are located on the same circuit board as the motor drive power supply circuit.

[0028] In this embodiment, the interference signal detection module can specifically be a voltage detection circuit whose input port is connected in parallel across the Y capacitor. The output port of the voltage detection circuit is electrically connected to the motor input adjustment module. The voltage detection circuit is used to detect noise signals on the Y capacitor, specifically the changes in the voltage signal on the Y capacitor. The output port of the motor input adjustment module is electrically connected to the interference signal detection module. After receiving the change in the input voltage signal on the Y capacitor, the motor input adjustment module obtains the required motor input current according to a preset algorithm. When the motor input adjustment module detects an increase in the voltage on the Y capacitor, it controls the motor drive power supply circuit to reduce the output current to the motor, thereby reducing the intensity of the corresponding electromagnetic coupling interference.

[0029] In this embodiment, the motor input adjustment module can specifically be an MCU circuit module. The MCU chip of the MCU circuit module stores a computer program that executes a preset algorithm. Then, based on the execution result of the computer program, the MCU chip uses the peripheral circuit of the MCU circuit module to transmit electrical signals to adjust the magnitude and / or direction of the current input to the motor from the motor drive power supply circuit.

[0030] In this embodiment, the optimal preset algorithm uses an empirical formula to control the current input to the motor from the motor drive power supply circuit. This empirical formula, obtained through multiple tests under the same conditions, more closely approximates the actual operational requirements. Once the empirical formula is established, the MCU chip calculates the corresponding adjustment amount of the motor drive power supply circuit's output current based on the input voltage. The MCU chip then generates a corresponding adjustment command based on this adjustment amount. After the adjustment command is output, the peripheral circuits of the MCU circuit module convert it into a set of changing electrical signal sequences. Under this determined set of changing electrical signal sequences, the motor drive power supply circuit continuously reduces the current output to the motor, thereby preventing the generation of excess magnetic fields on the motor stator frame and avoiding electromagnetic coupling interference from the metal frame.

[0031] In this embodiment, the preset algorithm may also employ PWM modulation, PID modulation, a lightweight neural network model based on pre-trained training, a reinforcement learning model based on the FOC principle, etc.

[0032] In other embodiments, the motor input adjustment module may specifically be a feedback control circuit.

[0033] Compared to existing technologies, the electromagnetic coupling interference prevention device for the metal frame fan in this embodiment has the following advantages: it solves the problem of electromagnetic coupling interference to other electronic devices when the motor coil of the metal frame fan is energized, while avoiding the safety hazard of fan circuit breakage that may occur with existing technologies.

[0034] As used herein, the terms “component,” “module,” “system,” “interface,” “process,” etc., generally refer to computer-related entities: hardware, a combination of hardware and software, software, or software in execution. For example, a component can be, but is not limited to, a process running on a processor, a processor, an object, an executable application, an executing thread, a program, and / or a computer. As illustrated, both an application running on a controller and the controller itself can be components. One or more components may reside within an executing process and / or thread, and components may be located on a single computer and / or distributed across two or more computers.

[0035] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A metal frame fan anti-electromagnetic coupling interference device, characterized in that, This includes Y capacitors, motor drive power supply circuits, and motor stator frames; One end of the Y capacitor is electrically connected to the negative terminal of the motor drive power supply circuit; The other end of the Y capacitor is electrically connected to the motor stator frame.

2. The anti-electromagnetic coupling interference device for a metal frame fan according to claim 1, characterized in that, The Y capacitor is located on the circuit board corresponding to the motor drive power supply circuit.

3. The anti-electromagnetic coupling interference device for a metal frame fan according to claim 2, characterized in that, The other end of the Y capacitor is electrically connected to the motor stator frame via a wire led out from the circuit board.

4. The anti-electromagnetic coupling interference device for a metal frame fan according to claim 2, characterized in that, The motor stator frame is equipped with contacts, which are soldered to the other end of the Y capacitor.

5. The anti-electromagnetic coupling interference device for a metal frame fan according to claim 2, characterized in that, The contacts on the motor stator frame are located on the side of the motor stator frame that is relatively close to the circuit board.

6. The anti-electromagnetic coupling interference device for a metal frame fan according to claim 1, characterized in that, The Y capacitor is provided in multiple quantities.

7. The anti-electromagnetic coupling interference device for a metal frame fan according to claim 1, characterized in that, It also includes an interference signal detection module; The interference signal detection module is electrically connected to the Y capacitor; The interference signal detection module is used to detect noise signals passing through the Y capacitor.

8. The anti-electromagnetic coupling interference device for a metal frame fan according to claim 7, characterized in that, It also includes a motor input adjustment module; The interference signal detection module is electrically connected to the motor input adjustment module, and the motor input adjustment module is electrically connected to the motor drive power supply circuit; The motor input adjustment module is used to adjust the output current of the motor drive power supply circuit according to the noise signal.

9. The anti-electromagnetic coupling interference device for a metal frame fan according to claim 8, characterized in that, The interference signal detection module is connected in parallel with the Y capacitor to detect the voltage across the Y capacitor.

10. The anti-electromagnetic coupling interference device for a metal frame fan according to claim 9, characterized in that, When the motor input regulation module detects an increase in the voltage across the Y capacitor, it controls the motor drive power supply circuit to reduce the current output to the motor.

Images