Fan rotating speed testing system
By using pressure sensors and signal adjustment circuits in the fan speed test system to detect the current signal frequency of the fan speed, the problem of inaccurate fan speed testing in the existing technology is solved, and high-accurate fan speed measurement is achieved.
Patent Information
- Application Number
- CN202323657203.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-31
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2033-12-31
AI Technical Summary
The prior art has inaccuracy in fan speed tests, and it is impossible to effectively distinguish the speed difference between the fan and the motor, resulting in inaccurate test results.
Design a fan speed test system, including motor, fan, pressure sensor and signal adjustment circuit, to obtain fan speed by inducing wind force and detecting the current signal frequency output by the pressure sensor, and use current amplification circuit and op amp chip to adjust the signal to improve Detection accuracy.
Accurate measurement of fan speed is achieved, the accuracy of the test system is improved, and the speed difference between the fan and motor is effectively distinguished.
Smart Images
Figure CN222162985U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the fan manufacturing industry, in particular to a fan speed testing system. Background Art
[0002] With the rapid development of the fan manufacturing industry, there are various fans on the market, such as ordinary fans, PWM control type fans, two-wire fans, twin type fans, etc. Fans need to be tested after production to detect their various performance indicators; in the past, the industry generally believed that the speed of the fan was consistent with the speed of the motor, so there was no need to test the fan speed, only the rated speed of the motor needed to be known, so in the test, the working current of the motor is generally tested, and the working power and speed of the motor are calculated through the working current, and then the speed of the fan is corresponded from the speed of the motor, but in reality, it is quite different from the actual speed of the fan, so it is necessary to design a test system with more accurate testing. Summary of the invention
[0003] The utility model aims to provide a fan speed test system to solve the problems in the prior art. The test system can accurately test the fan speed.
[0004] A fan speed test system comprises: a motor and a fan, wherein the motor is connected to the fan drive through its rotating shaft, and further comprises a pressure sensor for sensing wind force, a signal adjustment circuit, and an MCU, wherein the pressure sensor is electrically connected to the MCU through the signal adjustment circuit.
[0005] Furthermore, the signal adjustment circuit includes: a current amplification circuit.
[0006] The current signal output by the pressure sensor is relatively small, and the provision of a current amplification circuit is helpful in detecting the current signal. The current amplification circuit may be existing technology.
[0007] Furthermore, the signal adjustment circuit includes: an operational amplifier chip, the non-phase input terminal of the operational amplifier chip is connected to the output terminal of the pressure sensor through a resistor R3, the non-phase input terminal of the operational amplifier chip is grounded through a resistor R1, the inverting input terminal of the operational amplifier chip is grounded through a resistor R5, the output terminal of the operational amplifier chip is connected to a resistor R4, and the output terminal of the resistor R4 is connected to the reverse input terminal of the operational amplifier chip; it also includes two Schottky diodes, the two Schottky diodes are reversely connected and connected in series between a 5V power supply and ground, and the connection point of the two Schottky diodes is connected to the output terminal of the resistor R4.
[0008] Preferably, the output end of the pressure sensor is connected to a power supply 5V via a resistor R2.
[0009] The operational amplifier chip model is: OP27; the signal generated by the pressure sensor first increases the voltage of the signal through the resistor R2, then attenuates it by N times through the operational amplifier circuit, and finally raises the reduced signal voltage by 2.5V. N can be 10, 20, 30, etc.
[0010] Beneficial effects of the utility model: the utility model senses the wind force by arranging a pressure sensor, and obtains the fan speed by detecting the frequency of the output current of the pressure sensor, so the test is accurate. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of the utility model.
[0012] Figure 2 It is a principle schematic diagram of the utility model. DETAILED DESCRIPTION
[0013] The utility model is described in detail below with reference to the accompanying drawings.
[0014] Embodiment: A fan speed test system comprises: a motor and a fan, wherein the motor is connected to the fan drive through its rotating shaft, and further comprises a pressure sensor for sensing wind force, a signal adjustment circuit, and an MCU, wherein the pressure sensor is electrically connected to the MCU through the signal adjustment circuit.
[0015] When the fan is working, the wind force generated by the fan is periodic. Every time the fan rotates one circle, the wind force output to the outside fluctuates into one cycle. Therefore, the wind force that the pressure sensor is subjected to is also periodic, and the current signal output by the pressure sensor is also periodic. By testing the frequency of the current signal through the test circuit, the speed of the fan can be calculated. This system has high measurement accuracy. Secondly, in order to facilitate the detection of the current signal, the technical solution sets a signal adjustment circuit to adjust the current signal output by the pressure sensor. The pressure sensor can be fixed to the substrate and face the fan to feel the wind force.
[0016] Furthermore, the signal adjustment circuit includes: a current amplification circuit.
[0017] The current signal output by the pressure sensor is relatively small, and the provision of a current amplification circuit is helpful in detecting the current signal. The current amplification circuit may be existing technology.
[0018] See also Figure 1Further, the signal adjustment circuit includes: an operational amplifier chip, the non-phase input terminal of the operational amplifier chip is connected to the output terminal of the pressure sensor through a resistor R3, the non-phase input terminal of the operational amplifier chip is grounded through a resistor R1, the inverting input terminal of the operational amplifier chip is grounded through a resistor R5, the output terminal of the operational amplifier chip is connected to a resistor R4, and the output terminal of the resistor R4 is connected to the reverse input terminal of the operational amplifier chip; and also includes two Schottky diodes, the two Schottky diodes are reversely connected and connected in series between a 5V power supply and ground, and the connection point of the two Schottky diodes is connected to the output terminal of the resistor R4.
[0019] Preferably, the output end of the pressure sensor is connected to a power supply 5V via a resistor R2.
[0020] The operational amplifier chip model is: OP27; the signal generated by the pressure sensor first increases the voltage of the signal through resistor R2, then attenuates 20 times through the operational amplifier circuit, and finally raises 2.5V.
[0021] The above contents are only preferred embodiments of the utility model. For ordinary technicians in this field, according to the concept of the utility model, there will be changes in the specific implementation method and application scope. The content of this specification should not be understood as a limitation on the utility model.
Claims
1. A fan speed test system, comprising: The motor and the fan are connected to the fan drive through the rotating shaft of the motor, and are characterized in that: they also include a pressure sensor for sensing wind force, a signal adjustment circuit, and an MCU, and the pressure sensor is electrically connected to the MCU through the signal adjustment circuit.
2. A fan speed test system according to claim 1, characterized in that: The signal adjustment circuit includes: a current amplification circuit.
3. A fan speed test system according to claim 1, characterized in that: The signal adjustment circuit includes: an operational amplifier chip, the non-phase input terminal of the operational amplifier chip is connected to the output terminal of the pressure sensor through a resistor R3, the non-phase input terminal of the operational amplifier chip is grounded through a resistor R1, the inverting input terminal of the operational amplifier chip is grounded through a resistor R5, the output terminal of the operational amplifier chip is connected to a resistor R4, and the output terminal of the resistor R4 is connected to the reverse input terminal of the operational amplifier chip; it also includes 2 Schottky diodes, the 2 Schottky diodes are reversely connected and connected in series between a 5V power supply and ground, and the connection point of the 2 Schottky diodes is connected to the output terminal of the resistor R4.
4. A fan speed test system according to claim 3, characterized in that: The output end of the pressure sensor is connected to the power supply 5V through resistor R2.