Fan motor feedback system based on external magnetic sensor

Abstract

The utility model discloses a fan motor feedback system based on an external magnetic sensor, and belongs to the technical field of refrigerators. Comprising a temperature acquisition module, a control system and an external magnetic sensor. When the fan motor operates, the external magnetic sensor captures magnetic field changes and converts the magnetic field changes into electric signals. The control system processes the electric signals and extracts key information such as the rotating speed and the position of the fan motor. And the control system carries out real-time monitoring and feedback control on the running state of the fan motor according to the information. If the rotating speed of the fan motor deviates from the preset value, the control system can adjust the input voltage or current to correct the deviation. After the fan motor feedback system based on the external magnetic sensor is introduced, the control precision of the refrigerator fan motor can be remarkably improved. Through real-time feedback and accurate control, the rotating speed error of the fan motor can be reduced, and therefore accurate control over the temperature of the refrigerator is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigerators, and in particular to a fan motor feedback system based on an external magnetic sensor. Background Art

[0002] Currently, the fan motor control of the refrigerator is open-loop control. After the control board gives the refrigerator fan motor an instruction, the fan motor controls the speed according to the requirement.

[0003] However, the fan motor's speed will change due to changes in its own magnetic properties during rotation, resulting in a large error between the fan motor speed and the set speed, which is not conducive to precise control of the refrigerator temperature. Utility Model Content

[0004] The purpose of this utility model is to provide a fan motor feedback system based on an external magnetic sensor, aiming to at least solve the technical problems existing in the above-mentioned prior art. To achieve the above-mentioned purpose, the technical solutions adopted by this utility model are as follows:

[0005] A fan motor feedback system based on an external magnetic sensor includes a temperature acquisition module, a control system, and an external magnetic sensor; the temperature acquisition module is communicatively connected to the control system, and the temperature acquisition module is arranged in the refrigerator compartment and the freezer compartment of the refrigerator. The temperature acquisition module is used to collect temperature information of the refrigerator compartment and the freezer compartment and transmit it to the control system, and the control system outputs a speed adjustment instruction for the fan motor based on the temperature information; the external magnetic sensor is arranged in the wire frame of the fan motor, and is used to capture the magnetic field change signal of the fan motor and convert it into an electrical signal and send it to the control system, and the control system analyzes the electrical signal emitted by the external magnetic sensor to determine the difference between the speed of the fan motor and the set value.

[0006] As a further solution of the present invention: the temperature acquisition module includes a refrigeration temperature sensor and a freezing temperature sensor, the refrigeration temperature sensor is arranged in the refrigeration chamber of the refrigerator, and the freezing temperature sensor is arranged in the freezing chamber of the refrigerator.

[0007] As a further solution of the present invention: the control system includes a built-in signal processing circuit, and the signal processing circuit is used to process the electrical signal output by the external magnetic sensor to extract useful rotation speed and position information.

[0008] As a further solution of the present invention: the external magnetic sensor is a switch Hall sensor or a TMR sensor.

[0009] The utility model has the following beneficial effects:

[0010] When the fan motor of the present invention is running, the magnetic field it generates changes. The external magnetic sensor captures these changes and converts them into electrical signals. The control system's built-in signal processing circuit processes the electrical signals and extracts key information such as the fan motor's speed and position. Based on this information, the control system monitors the fan motor's operating status in real time and performs feedback control. If the fan motor's speed deviates from the preset value, the control system adjusts the input voltage or current to correct this deviation. The introduction of a fan motor feedback system based on an external magnetic sensor can significantly improve the control accuracy of the refrigerator's fan motor. Through real-time feedback and precise control, the fan motor's speed error can be reduced, which facilitates precise control of the refrigerator's temperature. This not only improves the refrigerator's cooling efficiency, but also reduces energy consumption and noise, enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described below with reference to the accompanying drawings.

[0012] Figure 1 This is a schematic diagram of the structure of a fan motor feedback system based on an external magnetic sensor in the utility model;

[0013] Figure 2 The utility model is a flow chart of a fan motor feedback system based on an external magnetic sensor.

[0014] In the figure: 1. Control system; 11. Signal processing circuit; 2. External magnetic sensor; 3. Refrigeration temperature sensor; 4. Freezer temperature sensor; 5. Fan motor. DETAILED DESCRIPTION

[0015] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0016] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", "front", "back", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, and a specific direction structure and operation. Therefore, they cannot be understood as a limitation on the present invention.

[0017] In addition, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.

[0018] See also Figure 1 As shown, an embodiment of the present invention provides a fan motor feedback system based on an external magnetic sensor, comprising a temperature acquisition module, a control system 1, and an external magnetic sensor 2. The temperature acquisition module is communicatively connected to the control system 1 and is disposed in the refrigerator compartment and the freezer compartment of the refrigerator. The temperature acquisition module is used to acquire temperature information of the refrigerator compartment and the freezer compartment and transmit it to the control system 1. The control system 1 outputs a speed adjustment instruction for the fan motor 5 based on the temperature information. The external magnetic sensor 2 is disposed within the wireframe of the fan motor 5. The external magnetic sensor 2 is used to capture the magnetic field change signal of the fan motor 5 and convert it into an electrical signal and transmit it to the control system 1. The control system 1 analyzes the electrical signal emitted by the external magnetic sensor 2 to determine the difference between the speed of the fan motor 5 and the set value.

[0019] The external magnetic sensor 2 is responsible for detecting the change in the magnetic field of the fan motor 5 , which is the basis for inferring key information such as the rotation speed and position of the fan motor 5 .

[0020] The fan motor 5 is the object to be controlled, and its rotation speed and position information are detected by the external magnetic sensor 2 .

[0021] Control system 1 receives the electrical signal information from external magnetic sensor 2 and performs further analysis and decision-making to achieve precise control of fan motor 5. Control system 1 has a built-in signal processing circuit 11 responsible for processing the electrical signal output by external magnetic sensor 2 and extracting useful information such as speed and position.

[0022] Specifically, the temperature acquisition module includes a refrigeration temperature sensor 3 and a freezing temperature sensor 4. The refrigeration temperature sensor 3 is arranged in the refrigerator's refrigerator compartment, and the refrigeration temperature sensor 3 collects the real-time temperature of the refrigerator's refrigerator compartment. The freezing temperature sensor 4 is arranged in the refrigerator's freezer compartment, and the freezing temperature sensor 4 collects the real-time temperature of the refrigerator's freezer compartment.

[0023] When the fan motor 5 operates, the magnetic field it generates changes. The external magnetic sensor 2 detects these changes and converts them into electrical signals. The control system 1's built-in signal processing circuit 11 processes these electrical signals, extracting key information such as the fan motor 5's speed and position. Based on this information, the control system 1 monitors the fan motor 5's operating status in real time and provides feedback control. If the fan motor 5's speed deviates from the preset value, the control system 1 adjusts the input voltage or current to correct the deviation.

[0024] The fan motor feedback system based on an external magnetic sensor provided by the utility model has the following advantages:

[0025] High precision: The external magnetic sensor 2 has high measurement accuracy and sensitivity, and can accurately reflect the operating status of the fan motor 5 in real time. The external magnetic sensor 2 can be a switch Hall sensor or a TMR sensor.

[0026] Real-time feedback: The system can detect the speed and position information of the fan motor 5 in real time and perform feedback control immediately, thereby reducing the speed error.

[0027] Good stability: The external magnetic sensor 2 is not easily affected by external environmental factors, such as temperature, humidity, etc., so the system has good stability.

[0028] The introduction of a fan motor 5 feedback system based on an external magnetic sensor 2 significantly improves the control accuracy of the refrigerator's fan motor 5. Through real-time feedback and precise control, the fan motor 5's speed error can be reduced, facilitating precise control of the refrigerator's temperature. This not only improves the refrigerator's cooling efficiency, but also reduces energy consumption and noise, enhancing the user experience.

[0029] The fan motor feedback system works as follows:

[0030] The system is started, and the refrigeration temperature sensor 3 and the freezing temperature sensor 4 collect the temperature of the refrigeration compartment and the freezing compartment respectively.

[0031] The control system 1 determines the initial operating gear of the fan motor 5, outputs a fan speed adjustment instruction (set value) according to the temperature of the refrigerator compartment and the freezer compartment, and uses PWM to control the speed.

[0032] The fan motor 5 receives the speed adjustment instruction electrical signal, processes and analyzes it, and then the fan motor 5 starts working.

[0033] The change in the speed of the fan motor 5 causes a change in the magnetic field. The external magnetic sensor 2 captures the change in the magnetic signal and converts it into an electrical signal.

[0034] The signal processing system of control system 1 analyzes the electrical signal emitted by external magnetic sensor 2 and determines the difference from the set value. If the difference is lower than the set value, control system 1 increases the duty cycle (PWM control) and increases the speed until the signal captured by external magnetic sensor 2 meets the set value. If the difference is higher than the set value, control system 1 decreases the duty cycle (PWM control) and reduces the speed until the signal captured by external magnetic sensor 2 meets the set value.

[0035] The fan motor 5 feedback system continuously monitors the fan motor 5 according to the above steps to achieve the purpose of accurately adjusting the speed of the fan motor 5.

[0036] The above detailed description of the preferred embodiments of the present invention should not be considered as limiting the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A fan motor feedback system based on an external magnetic sensor, characterized by: The invention comprises a temperature acquisition module, a control system (1) and an external magnetic sensor (2); the temperature acquisition module is in communication connection with the control system (1); the temperature acquisition module is arranged in the refrigerating chamber and the freezing chamber of the refrigerator; the temperature acquisition module is used to acquire temperature information of the refrigerating chamber and the freezing chamber and transmit it to the control system (1); the control system (1) outputs a speed adjustment instruction of the fan motor (5) according to the temperature information; the external magnetic sensor (2) is arranged in the wire frame of the fan motor (5); the external magnetic sensor (2) is used to capture the magnetic field change signal of the fan motor (5) and convert it into an electrical signal and transmit it to the control system (1); the control system (1) analyzes the electrical signal emitted by the external magnetic sensor (2) and determines the difference between the speed of the fan motor (5) and the set value.

2. A fan motor feedback system based on an external magnetic sensor according to claim 1, characterized in that: The temperature acquisition module comprises a refrigeration temperature sensor (3) and a freezing temperature sensor (4); the refrigeration temperature sensor (3) is arranged in the refrigeration chamber of the refrigerator, and the freezing temperature sensor (4) is arranged in the freezing chamber of the refrigerator.

3. The fan motor feedback system based on an external magnetic sensor according to claim 1, characterized in that: The control system (1) includes a built-in signal processing circuit (11), and the signal processing circuit (11) is used to process the electrical signal output by the external magnetic sensor (2) to extract useful rotation speed and position information.

4. The fan motor feedback system based on an external magnetic sensor according to claim 1, characterized in that: The external magnetic sensor (2) is a switch Hall sensor or a TMR sensor.

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