High-precision wide-range speed generator

Abstract

The present invention discloses a high-precision wide-range speed generating device. The device comprises: a control unit, which comprises a position sensor, an FPGA module and a microprocessor, wherein the position sensor is communicatively connected to the FPGA module, and the FPGA module is communicatively connected to the microprocessor; an electromechanical unit, which comprises a servo motor, an electronic converter, a gear speed increasing mechanism, a low-speed output shaft and a high-speed output shaft, wherein the servo motor is electrically connected to the electronic converter, mechanically connected to the gear speed increasing mechanism, and drivingly connected to the low-speed output shaft and the high-speed output shaft; and an input-output unit. The device is based on a servo motor, a two-stage high-precision gear speed increasing mechanism and FPGA technology to achieve wide-range generation and precise control of standard speeds of 0.1 to 100,000 r / min, and can complete accurate and reliable contact or non-contact wide-range speed detection calibration of tachometers, speed measuring instruments and speed sensors.

Description

Technical Field

[0001] The present invention relates to the technical field of measurement and testing, and more specifically, to a high-precision wide-range rotational speed generating device for contact or non-contact rotational speed measuring instruments and rotational speed sensor detection. Background Art

[0002] Speed ​​is an important parameter that describes the technical performance of various rotating machines. It is the basis of mechanical kinematics measurement. The speed of rotating machines must be measured using speed measuring instruments or speed sensors and secondary instruments. Among them, speed measuring instruments and speed sensors that belong to working tools are widely used in various industries. For example, speed measuring instruments and speed sensors are one of the necessary instruments in the machinery industry. They are used to measure the speed or frequency of motors. They are commonly used in manufacturing industries such as motors, fans, papermaking, plastics, chemical fibers, washing machines, automobiles, aircraft, and ships, involving all areas of the national economy. Various types of speed measuring instruments and speed sensors must be verified or calibrated by speed standard devices or speed generating devices.

[0003] In the field of metrology and measurement, in order to ensure the uniformity of measurement values ​​or accurate and reliable measurements, it is an important task to detect the measurement range and measurement error of speed measuring instruments and speed sensors. In China, the traditional detection of speed measuring instruments often uses a brushless motor with a five-stage gear speed change device to form a standard speed device with five speed output shafts, covering the speed output range of 5 to 100,000 r / min, as disclosed in the Chinese patent "Standard Speed ​​Device" (application number: 201420626207.5). Another method of extending the upper limit of speed measurement is based on micro-motors and FPGA technology, and relies on a speed output shaft to form a standard speed device, covering the speed output range of 3,000 to 120,000 r / min, as disclosed in the Chinese patent "Speed ​​Standard Device" (application number: 201620473050.6). In addition, a combination configuration of a high-speed servo motor connected to a speed increasing transmission box and a speed reducing transmission box is used to cover a speed output range of 0 to 20,000 r / min, as disclosed in the Chinese patent "Speed ​​Characteristics Calibration Device" (application number: 202010208262.2).

[0004] With the rapid development of aerospace, national defense, medical and health care and some high-tech industries in recent years, the existing two types of speed standard devices and one type of speed characteristic calibration device can no longer meet the wide-range speed measurement needs from national defense construction and people's livelihood security in terms of measurement range and measurement accuracy.

[0005] In the prior art, brushless motors are usually used in conjunction with gear speed change devices to achieve the expansion of the output range through five-stage speed increase and reduction. The speed range that can be achieved is 5 to 100,000 r / min. Using micro motors and FPGA technology, the speed range that can be achieved is 3,000 to 120,000 r / min. The combination of a high-speed servo motor connected to a speed increase transmission box and a speed reduction transmission box covers a speed output range of 0 to 20,000 r / min. These cannot meet the wide range requirements of the commonly used wide-range speed measuring instrument, which has a measurement range of 0.1 to 100,000 r / min. In addition, the brushless motor with a five-stage gear speed change device has a complex structure and a clumsy appearance, and has large vibration and noise during operation. Due to the error accumulation of the five-stage speed change: the uncertainty is 1×10 when the speed is 5 to 1,000 r / min. -4 , when the speed is 1000~100000r / min, it is 5×10 -5 The combination of high-speed servo motor connected to the speed increaser and speed reduction gearbox also has the error accumulation of multi-stage speed change, and the mechanical wear of the micro motor leads to reduced accuracy, poor stability, and short service life, which cannot meet the requirements of high-precision speed measuring instrument 1×10 -5 high accuracy requirements. Summary of the invention

[0006] The purpose of the present invention is to propose a high-precision wide-range speed generating device, which is based on a servo motor, a two-stage high-precision gear speed increasing mechanism with a large speed increasing ratio and FPGA technology to achieve wide-range generation and precise control of standard speed. The FPGA module is used for real-time control of the speed, and has high calculation accuracy and strong anti-electromagnetic interference capability. In view of the low speed increasing ratio, narrow speed range, large speed fluctuation, and large oil splash lubrication loss of the traditional separately installed two-stage gear speed increasing mechanism, the present invention adopts an integrally installed, grease-lubricated two-stage high-precision gear speed increasing mechanism to reduce gear processing errors and assembly errors. The speed increasing ratio is 1:10, and the operation is stable with small speed fluctuations. The present invention can complete accurate and reliable contact or non-contact wide-range speed detection and calibration of tachometers, speed measuring instruments and speed sensors, and the uncertainty of the speed output is better than 1×10 -5 .

[0007] The present invention adopts the following solutions:

[0008] A high-precision wide-range rotation speed generating device, the device may include:

[0009] Power supply unit;

[0010] A control unit, comprising a position sensor, an FPGA module and a microprocessor, wherein the position sensor is communicatively connected to the FPGA module, and the FPGA module is communicatively connected to the microprocessor;

[0011] The electromechanical unit comprises a servo motor, an electronic converter, a gear speed increasing mechanism, a low speed output shaft and a high speed output shaft, wherein the servo motor is electrically connected to the electronic converter, mechanically connected to the gear speed increasing mechanism, and drivingly connected to the low speed output shaft and the high speed output shaft, wherein the low speed output shaft can drive a 60-tooth standard speed gear disk to rotate or drive a photoelectric signal reflection disk to rotate, and the high speed output shaft can drive the photoelectric signal reflection disk to rotate, and through the standard speed gear disk or the photoelectric signal reflection disk, the speed measuring instrument and the speed sensor to be detected can perform contact or non-contact measurement of the output speed of the high-precision wide-range speed generating device;

[0012] Wherein, the servo motor is communicatively connected with the position sensor, and the upper limit of the speed of the servo motor can reach 12000r / min;

[0013] The speed range of the speed generating device is 0.1~100000r / min, and the uncertainty is better than 1×10 -5 ;

[0014] The gear speed increasing mechanism adopts a two-stage high-precision gear speed increasing mechanism which is integrally installed and grease lubricated.

[0015] Preferably, in the high-precision wide-range rotation speed generating device, the gear speed increasing mechanism can be a two-stage speed increasing mechanism with a speed increasing ratio of 1:10.

[0016] Preferably, in the high-precision wide-range rotational speed generating device, the output rotational speed range of the low-speed output shaft can be 0.1 to 10000 r / min.

[0017] Preferably, in the high-precision wide-range rotational speed generating device, the output rotational speed range of the high-speed output shaft can be 10 to 100,000 r / min.

[0018] Preferably, in the high-precision wide-range rotational speed generating device, the low-speed output shaft can drive the 60-tooth standard speed gear plate to rotate.

[0019] Preferably, in the high-precision wide-range rotation speed generating device, the low-speed output shaft can drive the photoelectric signal reflection disk to rotate.

[0020] Preferably, in the high-precision wide-range rotation speed generating device, the high-speed output shaft can drive the photoelectric signal reflection disk to rotate.

[0021] Preferably, in the high-precision wide-range rotation speed generating device, the input-output unit may include a user interaction interface.

[0022] Preferably, in the high-precision wide-range rotation speed generating device, the user interaction interface may be a touch display screen.

[0023] Preferably, in the high-precision wide-range rotation speed generating device, the control unit, the power supply unit and the input-output unit can be integrated in the same chassis.

[0024] Beneficial effects of the present invention: The present invention adopts a servo motor, a two-stage high-precision gear speed-increasing mechanism and FPGA technology to realize wide-range generation and precise control of standard speed, wherein the two-stage high-precision gear speed-increasing mechanism has the characteristics of few stages, high speed-increasing ratio, reasonable structure and small accumulated mechanical error in the transmission process, and the servo motor feedbacks the signal through the position sensor, and the position sensor is feedback-controlled by the FPGA, so that the adjustable and controllable speed setting of the low-speed output shaft and the high-speed output shaft can be realized, so that the high-precision wide-range speed generating device can complete the accurate and reliable speed detection and calibration of the contact or non-contact speed measuring instrument and speed sensor. The present invention has a wide speed range, a low speed lower limit, low operating noise and vibration, strong anti-interference ability, flexible and convenient operation, and low price. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments disclosed in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0026] Figure 1 The figure shows the overall structure of a high-precision wide-range rotation speed generating device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0028] Figure 1 The overall structure of a high-precision wide-range speed generator according to an embodiment of the present invention is shown as follows Figure 1As shown, the high-precision wide-range speed generating device may include: a control unit 100, an electromechanical unit 200, a power supply unit 300 and an input-output unit 400. The control unit 100 may include a position sensor 101, an FPGA module 102 and a microprocessor 103, wherein the position sensor 101 is communicatively connected to the FPGA module 102, and the FPGA module 102 is communicatively connected to the microprocessor 103. The electromechanical unit 200 may include a servo motor 201, an electronic converter 202, a gear speed increasing mechanism 203, a low-speed output shaft 204 and a high-speed output shaft 205, wherein the servo motor 201 is electrically connected to the electronic converter 202, mechanically connected to the gear speed increasing mechanism 203, and transmission-connected to the low-speed output shaft 204 and the high-speed output shaft 205. The input-output unit 400 is communicatively connected to the microprocessor 103, and electrically connected to the electronic converter 202 and the power supply unit 300. In the high-precision wide-range speed generating device, the servo motor 201 is connected to the position sensor 101 for communication, wherein the servo motor can be Panasonic's MHMF042L1U2M, with an upper speed limit of 12000r / min, and its corresponding driver is MCDLN35SC.

[0029] The user inputs the set speed through the input-output unit 400, and the electronic converter 202 converts the input speed into a signal for driving the servo motor 201. The position sensor 101 measures the speed of the servo motor 201 in real time, and controls the speed of the servo motor 201 to the input speed by comparing the measured speed with the input speed through the signal processing of the FPGA module 102 and the microprocessor 103. The high-precision wide-range speed generating device of the present invention is based on a servo motor, a two-stage high-precision gear speed increasing mechanism and FPGA technology to achieve wide-range generation and precise control of standard speeds, and can complete accurate and reliable contact or non-contact wide-range speed detection calibration of tachometers, speed measuring instruments and speed sensors.

[0030] In one example, the gear speed increasing mechanism 203 can be a two-stage speed increasing mechanism with a speed increasing ratio of 1:10. The two-stage gear speed increasing mechanism has a high speed increasing ratio, a reasonable structure, and stable operating characteristics, and can achieve reliable speed output.

[0031] In one example, the output speed range of the low speed output shaft 204 may be 0.1-10000 r / min.

[0032] In one example, the output speed range of the high speed output shaft 205 may be 10-100000 r / min.

[0033] In one example, the low speed output shaft 204 can rotate a 60-tooth standard speed gear plate.

[0034] In one example, the low-speed output shaft 204 can drive the photoelectric signal reflection disk to rotate.

[0035] In one example, the high speed output shaft 205 can drive the photoelectric signal reflection disk to rotate.

[0036] In one example, the input-output unit 400 may include a user interaction interface. The user may input a set rotation speed through the user interaction interface.

[0037] In one example, the user interaction interface may be a touch display screen.

[0038] In one example, the control unit 100 , the power supply unit 300 , and the input-output unit 400 may be integrated in the same chassis.

[0039] Application Examples

[0040] To facilitate understanding of the solutions and effects of the embodiments of the present invention, three specific application examples are given below. Those skilled in the art should understand that the examples are only for facilitating understanding of the present invention, and any specific details thereof are not intended to limit the present invention in any way.

[0041] Application Example 1: Use the high-precision wide-range rotation speed generating device of the present invention to detect a laser rotation speed measuring instrument.

[0042] The measuring beam emitted by the laser sensor of the laser speed measuring instrument is irradiated on the low speed output shaft 204 or the high speed output shaft 205 of the high-precision wide-range speed generating device according to the present invention, and the output speed of the high-precision wide-range speed generating device is measured by the photoelectric signal reflection disk driven by the output shaft of the device. Through the touch display screen of the high-precision wide-range speed generating device, the output speed is set in the speed range of 1 to 100000 r / min according to the 1, 3, and 5 series to complete the detection of the measurement range and measurement error of the speed measuring instrument. The measurement results show that the expanded measurement uncertainty of the laser speed measuring instrument in the speed range of 1 to 100000 r / min of the present invention is 0.001%.

[0043] Application Example 2: Use the high-precision wide-range speed generating device of the present invention to detect the photoelectric digital tachometer.

[0044] The measuring light beam emitted by the photoelectric sensor of the photoelectric digital tachometer is irradiated on the low speed output shaft 204 or the high speed output shaft 205 of the high-precision wide-range speed generating device of the present invention, and the output speed of the high-precision wide-range speed generating device is measured by the photoelectric signal reflection disk driven by the output shaft of the device. Through the touch display screen of the high-precision wide-range speed generating device, the output speed is set in the speed range of 1 to 99999 r / min according to the 1, 3, and 5 series to complete the detection of the measurement range and measurement error of the photoelectric digital tachometer. The measurement results show that the maximum allowable error of the photoelectric digital tachometer in the speed range of 1 to 99999 r / min of the present invention is 0.05%.

[0045] Application Example 3: Use the high-precision wide-range rotation speed generating device of the present invention to detect the magnetoelectric rotation speed sensor.

[0046] The magnetoelectric speed sensor is close to the 60-tooth standard speed gear plate driven by the low-speed output shaft 204 of the high-precision wide-range speed generator of the present invention. The front end face of the sensor has a clearance of (0.5~1.5) mm with the tooth top and is perpendicular to and intersects with the gear axis. The output speed of the high-precision wide-range speed generator is measured. Through the touch display screen of the high-precision wide-range speed generator, the output speed is set to 300 r / min, 500 r / min, 1000 r / min, 3000 r / min, 5000 r / min, and 7000 r / min to complete the detection of the measurement error of the magnetoelectric speed sensor. The measurement results show that the measurement error of the magnetoelectric speed sensor in the speed range of 300~7000 r / min of the present invention is ±1r / min.

[0047] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein are selected to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. High-precision wide-range speed generator, characterized in that: include: Power supply unit; A control unit, comprising a position sensor, an FPGA module and a microprocessor, wherein the position sensor is communicatively connected to the FPGA module, and the FPGA module is communicatively connected to the microprocessor; An electromechanical unit, comprising a servo motor, an electronic converter, a gear speed increasing mechanism, a low speed output shaft and a high speed output shaft, wherein the servo motor is electrically connected to the electronic converter, mechanically connected to the gear speed increasing mechanism, and drivingly connected to the low speed output shaft and the high speed output shaft; and an input-output unit, communicatively connected to the microprocessor, and electrically connected to the electronic converter and the power supply unit, Wherein, the servo motor is communicatively connected with the position sensor, and the upper limit of the speed of the servo motor can reach 12000r / min; The speed range of the speed generating device is 0.1~100000r / min, and the uncertainty is better than 1×10 -5 ; The gear speed increasing mechanism adopts a two-stage high-precision gear speed increasing mechanism which is integrally installed and grease lubricated; The gear speed increasing mechanism has two-stage speed increasing, and its speed increasing ratio is 1:10; The output speed range of the low-speed output shaft is 0.1-10000 r / min; The output speed range of the high-speed output shaft is 10 to 100,000 r / min.

2. The high-precision wide-range speed generator according to claim 1, characterized in that: The low-speed output shaft can drive a 60-tooth standard-speed gear plate to rotate.

3. The high-precision wide-range speed generator according to claim 1, characterized in that: The low-speed output shaft can drive the photoelectric signal reflection disk to rotate.

4. The high-precision wide-range speed generator according to claim 1, characterized in that: The high-speed output shaft can drive the photoelectric signal reflection disk to rotate.

5. The high-precision wide-range speed generator according to claim 1, characterized in that: The input-output unit includes a user interaction interface.

6. The high-precision wide-range speed generator according to claim 5, characterized in that: The user interaction interface is a touch display screen.

7. The high-precision wide-range speed generator according to claim 1, characterized in that: The control unit, power supply unit and input / output unit are integrated in the same chassis.

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