阅读说明：本技术 一种高精度转速测量模块 (High-precision rotating speed measuring module ) 是由 王宽厚 赵伟红 徐辉 何亚锋 王章旭 于 2019-09-16 设计创作，主要内容包括：本发明提供了一种高精度转速测量模块,高精度转速测量模块包括弱磁测量电路。弱磁测量电路包括磁阻式传感器及迟滞比较器,磁阻式传感器的输入端电连接有驱动器及振荡器。磁阻式传感器的输出端电连接有多级放大器,多级放大器的输出端电连接有相敏调节器。相敏调节器的输出端电连接有PID网络。迟滞比较器的输入端与PID网络的输出端电连接,且迟滞比较器的输出端与示波器电连接。迟滞比较器用于将连续正弦波电压信号输出为脉冲方波电压信号,示波器用于显示及记录脉冲方波电压信号。本发明的高精度转速测量模块具有体积小、低温漂、耐高温的优点,适用于高温石油测井、弹导船舶、医疗设备、汽车电子等领域。(The invention provides a high-precision rotating speed measuring module which comprises a weak magnetic measuring circuit. The weak magnetic measuring circuit comprises a magnetic resistance type sensor and a hysteresis comparator, and the input end of the magnetic resistance type sensor is electrically connected with a driver and an oscillator. The output end of the reluctance type sensor is electrically connected with a multistage amplifier, and the output end of the multistage amplifier is electrically connected with a phase sensitive regulator. The output end of the phase-sensitive regulator is electrically connected with a PID network. The input end of the hysteresis comparator is electrically connected with the output end of the PID network, and the output end of the hysteresis comparator is electrically connected with the oscilloscope. The hysteresis comparator is used for outputting the continuous sine wave voltage signal as a pulse square wave voltage signal, and the oscilloscope is used for displaying and recording the pulse square wave voltage signal. The high-precision rotating speed measuring module has the advantages of small volume, low temperature drift and high temperature resistance, and is suitable for the fields of high-temperature oil well logging, missile-borne ships, medical equipment, automobile electronics and the like.)

1. The utility model provides a high accuracy rotational speed measurement module, high accuracy rotational speed measurement module establish on the testee, just a plurality of pin welding pins on the high accuracy rotational speed measurement module are connected its characterized in that through the wire electricity with oscilloscope: the high-precision rotating speed measuring module comprises a weak magnetic measuring circuit and a hysteresis comparator;

The weak magnetic measurement circuit comprises a magnetic resistance type sensor, the input end of the magnetic resistance type sensor is electrically connected with a driver and an oscillator, and the magnetic resistance type sensor generates a bilateral excitation signal under the combined action of the driver and the oscillator; the output end of the magnetic resistance type sensor is electrically connected with a multistage amplifier, the output end of the multistage amplifier is electrically connected with a phase sensitive regulator, and the phase sensitive regulator is used for converting a double-side excitation signal amplified by the multistage amplifier into a single-side voltage signal; the output end of the phase-sensitive regulator is electrically connected with a PID network, and the PID network is used for outputting the single-side voltage signal as a continuous sine wave voltage signal;

The input end of the hysteresis comparator is electrically connected with the output end of the PID network, and the output end of the hysteresis comparator is electrically connected with the oscilloscope; the hysteresis comparator is used for outputting the continuous sine wave voltage signal as a pulse square wave voltage signal, and the oscilloscope is used for displaying and recording the pulse square wave voltage signal.

2. A high precision rotation speed measuring module according to claim 1, characterized in that: the output end of the PID network is also respectively and electrically connected with a feedback resistor and an OFFSET band of the reluctance type sensor, and the PID network, the feedback resistor and the OFFSET band of the reluctance type sensor form a closed-loop negative feedback network of the weak magnetism measuring circuit.

3. a high precision rotation speed measuring module according to claim 1, characterized in that: and a low-pass filter is also arranged between the phase-sensitive regulator and the PID network.

4. A high accuracy rotational speed measuring module according to claim 2 or 3, characterized in that: and a signal amplification circuit is also arranged between the weak magnetic measurement circuit and the hysteresis comparator.

5. A high accuracy rotational speed measuring module according to claim 4, characterized in that: and a high-pass filter network is also arranged between the signal amplification circuit and the hysteresis comparator.

6. A high precision rotation speed measuring module according to claim 1, characterized in that: the high-precision rotating speed measuring module is packaged in the shell, and a plurality of pin welding pins on the high-precision rotating speed measuring module penetrate out of the shell.

7. A high accuracy rotational speed measuring module according to claim 6, characterized in that: the shell is made of high-temperature polyimide materials.

8. A high accuracy rotational speed measuring module according to claim 6, characterized in that: and high-temperature epoxy resin is filled between the high-precision rotating speed measuring module and the shell.

Technical Field

The invention relates to the technical field of rotating speed measurement, in particular to a high-precision rotating speed measuring module.

Background

with the rapid development of science and technology, the application of controlling the rotating speed in various mechanical devices is gradually increased in industrial real-time control. The rotating speed is an extremely important state parameter of the rotation of an object, the rotating speed of the object needs to be measured in the measurement and control of a plurality of object motion systems, and the accuracy of the speed measurement directly influences the control condition of the system. In order to accurately know the working condition of the object and control the object in real time, the detection and control of the rotating speed are necessary.

At present, some rotating speed measuring devices on the market have the problems of large volume, complex structure, large power consumption, high price, poor impact resistance and the like.

Therefore, there is a need for an improved rotation speed measuring module in the prior art to solve the above problems.

Disclosure of Invention

The invention aims to provide a high-precision rotating speed measuring module which is small in size, low in temperature drift and resistant to high temperature, has the advantages of single-shaft high-stability weak magnetic measurement, modular design, shock and vibration resistance, frequency output and TTL/CMOS level compatibility, and can be widely applied to the fields of high-temperature oil well logging, missile ship, medical equipment, automobile electronics and the like.

The design idea of the high-precision rotating speed measuring module is that the high-precision rotating speed measuring module is arranged on an object, the magnetic lines of the earth magnetic force are continuously cut when the object rotates, a magnetic resistance type sensor arranged in the high-precision rotating speed measuring module is adopted to detect the magnetic field of the cut earth magnetic lines of the earth magnetic force, geomagnetic signals are converted into periodic voltage signals, and the periodic voltage signals are output as pulse signals through a comparator so as to record the rotating speed of the object.

The technical scheme for realizing the purpose of the invention is as follows: the utility model provides a high accuracy rotational speed measurement module, high accuracy rotational speed measurement module establishes on the testee, and a plurality of pin welding pins on the high accuracy rotational speed measurement module are connected through the wire electricity with the oscilloscope, and high accuracy rotational speed measurement module includes weak magnetism measuring circuit and hysteresis comparator. When the measured object rotates, the high-precision rotating speed measuring module arranged on the measured object is driven to rotate together, and when the measured object rotates to cut the magnetic lines of force of the earth, weak geomagnetic signals are generated. The weak magnetic measurement circuit amplifies weak geomagnetic signals and converts the weak geomagnetic signals into voltage signals, and pulse square wave voltage signals are output through the hysteresis comparator so as to record the rotating speed of a measured object.

The weak magnetic measuring circuit comprises a magnetic resistance type sensor, the input end of the magnetic resistance type sensor is electrically connected with a driver and an oscillator, and the magnetic resistance type sensor generates a bilateral excitation signal under the combined action of the driver and the oscillator. The output end of the magnetic resistance type sensor is electrically connected with a multistage amplifier, the output end of the multistage amplifier is electrically connected with a phase sensitive regulator, and the phase sensitive regulator is used for converting a double-side excitation signal amplified by the multistage amplifier into a single-side voltage signal. The output end of the phase-sensitive regulator is electrically connected with a PID network, and the PID network is used for outputting the single-side voltage signal as a continuous sine wave voltage signal.

The input end of the hysteresis comparator is electrically connected with the output end of the PID network, and the output end of the hysteresis comparator is electrically connected with the oscilloscope. The hysteresis comparator is used for outputting the continuous sine wave voltage signal as a pulse square wave voltage signal, and the oscilloscope is used for displaying and recording the pulse square wave voltage signal.

In order to improve the stability and the measurement accuracy of the high-precision rotating speed measurement module, the weak magnetic measurement circuit adopts a closed-loop control principle, namely the output end of the PID network is also respectively and electrically connected with a feedback resistor and an OFFSET (OFFSET field switching) belt of a magnetoresistive sensor, the PID network, the feedback resistor and the OFFSET belt of the magnetoresistive sensor form a closed-loop negative feedback network of the weak magnetic measurement circuit, when a magnetic field changes (increases or decreases), the closed-loop negative feedback network can be corrected in real time, and the voltage value of the feedback resistor represents the size of the magnetic field.

and a low-pass filter is also arranged between the phase-sensitive regulator and the PID network and can filter high-frequency interference signals.

As a further improvement of the invention, a signal amplification circuit is also arranged between the weak magnetic measurement circuit and the hysteresis comparator, and the signal amplification circuit can effectively reduce the common-mode noise of the high-precision rotating speed measurement module.

Preferably, a high-pass filter network is further arranged between the signal amplification circuit and the hysteresis comparator, the high-pass filter network has the advantages of low noise, high precision and low temperature drift, and the high-pass filter network can improve the resolution of the rotating speed measurement of the object to be measured and reduce the low-frequency noise of the high-precision rotating speed measurement module.

Wherein, high accuracy rotational speed measurement module encapsulation is in the casing, and a plurality of pin welding pins on the high accuracy rotational speed measurement module are worn out of the casing.

As a further improvement of the invention, the shell is made of high-temperature polyimide material, and the high-temperature polyimide material has the advantages of high strength, high modulus, high temperature resistance and high toughness.

as a further improvement of the invention, high-temperature epoxy resin is filled between the high-precision rotating speed measuring module and the shell, and high-temperature epoxy resin is filled between the high-precision rotating speed measuring module and the shell, so that on one hand, the high-precision rotating speed measuring module can be prevented from being damaged due to the fact that the high-precision rotating speed measuring module impacts the shell in the shell when a measured object rotates, and on the other hand, the high-precision rotating speed measuring module can resist high temperature and moisture, and the service life of the high-precision rotating speed measuring module is prolonged.

Compared with the prior art, the beneficial effects of the invention are as follows:

1. When the high-precision rotating speed measuring module provided by the invention is used for measuring the rotating speed of the measured object, the high-precision rotating speed measuring module is not influenced by the ambient temperature and humidity, the temperature characteristic of the high-precision rotating speed measuring module is greatly improved, and the rotating speed measuring precision of the measured object is also enhanced.

2. The high-precision rotating speed measuring module has the characteristics of single-axis high-stability weak magnetic measurement, modular design, impact vibration resistance, compatibility of frequency output and TTL/CMOS level, high temperature resistance (more than or equal to 175 ℃), low temperature drift (less than or equal to 5 ppm/DEG C), small volume and the like.

Drawings

FIG. 1 is an internal schematic block diagram of a high precision rotational speed measurement module according to the present invention;

FIG. 2 is a circuit diagram of a weak magnetic measurement circuit according to the present invention;

FIG. 3 is a circuit diagram of a hysteresis comparator in the present invention

FIG. 4 is a circuit diagram of a signal amplification circuit according to the present invention;

Fig. 5 is a circuit diagram of a high-pass filter network according to the present invention.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

In the description of the present embodiments, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to a number of indicated technical features. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

The terms "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.