CN-121994387-A - Rotating shaft torque detection circuit and system with torque direction identification function

CN121994387ACN 121994387 ACN121994387 ACN 121994387ACN-121994387-A

Abstract

The invention provides a rotating shaft torque detection circuit and a rotating shaft torque detection system with torque direction identification. The circuit comprises a zero-crossing comparison circuit, and is used for converting an induction signal output by the sensor probe into two paths of pulse square wave signals. And the signal filtering circuit is used for converting the two paths of pulse square wave signals into direct current voltage signals. And the phase discrimination module is used for processing the direct-current voltage signal according to the phase difference between the output signals of the two front-end sensor probes, so that the voltage value corresponds to the torque value and the voltage polarity corresponds to the torque direction. The signal conditioning module is used for conditioning and standardizing the amplitude of the second direct-current voltage signal output by the phase discrimination module and outputting a torque detection signal of which the voltage amplitude range is matched with the preset input range of the microcontroller.

Inventors

CHEN JUNLONG
CHEN CHANGPENG
ZHOU FUQIANG
WENG XINQUAN

Assignees

厦门乃尔电子有限公司

Dates

Publication Date: 20260508
Application Date: 20260226

Claims (10)

1. A rotary shaft torque detection circuit with torque direction recognition, the input end of which is connected with a sensor probe, and the output end of which is connected with a microcontroller, the rotary shaft torque detection circuit is characterized by comprising: The zero-crossing comparison circuit is used for converting the induction signals output by the sensor probes into two paths of pulse square wave signals; The input end of the signal filtering circuit is connected with two paths of outputs of the zero-crossing comparison module through an exclusive-or gate and is used for converting two paths of pulse square wave signals into direct-current voltage signals; the input end of the phase discrimination module is connected with the output end of the signal filtering module, and is used for processing the direct-current voltage signal according to the phase difference between output signals of the two front-end sensor probes, so that the voltage value corresponds to the torque value and the voltage polarity corresponds to the torque direction; And the input end of the signal conditioning module is connected with the output end of the phase discrimination module, and is used for conditioning and standardizing the amplitude of the second direct-current voltage signal output by the phase discrimination module and outputting a torque detection signal of which the voltage amplitude range is matched with the preset input range of the microcontroller.
2. The rotating shaft torque detection circuit with torque direction recognition according to claim 1, wherein the signal processing module comprises a signal amplification processing module and a zero point adjustment module; The input end of the signal amplification processing circuit is connected with the output end of the phase discrimination module and is used for amplifying the second direct-current voltage signal subjected to phase discrimination processing; And the input end of the zero point adjusting circuit is connected with the output end of the signal amplifying processing module and is used for adjusting the amplitude range of the amplified direct-current voltage signal to be within the voltage range preset by the microcontroller so as to form a torque detection output signal which can be directly read by the ADC of the microcontroller.
3. The rotating shaft torque detection circuit with torque direction identification according to claim 1, wherein the phase discrimination module is configured to output a positive direct current voltage when the phase difference indicates a first torque direction, to output a negative direct current voltage when the phase difference indicates a second torque direction opposite to the first torque direction, and wherein an absolute value of the direct current voltage increases with an increase in an absolute value of the phase difference.
4. A spindle torque detection circuit with torque direction identification according to claim 3, wherein the phase detection module comprises a data trigger, a switching tube and an amplifier; the data input end and the clock input end of the data trigger are respectively connected with the two paths of pulse square wave signal output ends of the zero-crossing comparison circuit, and are used for comparing the phase relation of the two paths of pulse signals and outputting high-low level signals corresponding to the torque direction; the control end of the switching tube is connected with one output end of the data trigger, the current outflow end of the switching tube is grounded, and the current inflow end of the switching tube is connected with one input end of the amplifier; the two input ends of the amplifier are connected with the output end of the signal filtering circuit, the other input end of the amplifier is connected with the output end of the amplifier through a resistor and grounded through another resistor, and the output end of the amplifier is connected with the signal conditioning module.
5. The rotating shaft torque detection circuit with torque direction identification according to claim 4, wherein a current inflow end of the switching tube is connected with a non-inverting input end of the amplifier, the switching tube is conducted when the output of the data trigger is high, the non-inverting input end of the amplifier is grounded, the amplifier works in an inverting amplification mode, and the switching tube is cut off when the output of the data trigger is low, and the amplifier works in the non-inverting amplification mode.
6. The rotating shaft torque detection circuit with torque direction recognition according to claim 1, further comprising a signal amplification and filtering circuit connected between the sensor probe and the zero-crossing comparison circuit, for amplifying and shaping and filtering the sensing signal output by the probe, respectively.
7. The rotating shaft torque detection circuit with torque direction identification according to claim 1, wherein one end of a coil of the sensor probe is grounded, and the other end of the coil of the sensor probe is connected with the signal filtering and amplifying circuit; The device also comprises a coil broken line detection module which is respectively connected with the other end of the coil of the sensor probe and the microcontroller so as to output a fault indication signal to the microcontroller when the coil is broken.
8. The rotating shaft torque detection circuit with torque direction identification according to claim 1, wherein the zero-crossing comparison module, the signal filtering module, the phase discrimination module and the signal conditioning module are integrated on the same circuit board.
9. The rotary shaft torque detection circuit with torque direction identification according to claim 1, further comprising a power module, wherein the power module is used for connecting an external power supply and converting the external power supply into a plurality of power supplies with different voltage values to supply power for each circuit and module.
10. A system for detecting torque of a rotating shaft with torque direction recognition, characterized by comprising the circuit for detecting torque of a rotating shaft with torque direction recognition according to any one of claims 1 to 9, and further comprising a communication module, an input end of which is connected with a data output end of the microcontroller module, and the communication module is used for converting the torque magnitude and direction information into differential digital signals and transmitting the differential digital signals to an upper computer or a terminal.

Description

Rotating shaft torque detection circuit and system with torque direction identification function Technical Field The invention relates to the technical field of mechanical parameter measurement, in particular to a rotating shaft torque detection circuit and system with torque direction identification. Background In the fields of mechanical transmission and automatic control, real-time and accurate measurement of rotating shaft torque is one of key technologies for realizing equipment state monitoring, fault diagnosis and energy-saving control. The current mainstream torque detection schemes are mainly divided into two main categories, namely contact type and non-contact type. The contact torque sensor is generally based on a resistive strain gauge principle, and is attached to the surface of a rotating shaft, and the torque is estimated by measuring a resistance change caused by the shape change of the shaft. The scheme has higher precision, is complex to install and is easy to be disturbed by environment, and fatigue damage risks exist under long-term operation, so that the scheme is not suitable for occasions of high-speed or long-term continuous monitoring. The non-contact torque sensor avoids direct mechanical contact with the rotating shaft, wherein the scheme based on the magnetoelectric induction principle is the mainstream choice in industrial application because of the advantages of simple structure, no need of independent power supply, quick response and the like. The system usually calculates torque indirectly by installing sound wheels and a magneto-electric sensor at two ends of a rotating shaft and detecting the phase difference of two paths of sensing signals. However, the existing magnetoelectric torque detection system is mostly dependent on a back-end microcontroller to capture and calculate software of the interval between two paths of pulse signals. The method has high requirements on the real-time performance and calculation force of the microcontroller, and is easily influenced by factors such as signal jitter, electromagnetic interference and the like under complex working conditions, so that the measurement stability is insufficient. More importantly, the existing scheme is difficult to directly identify the torque direction (namely forward rotation and reverse rotation) from the hardware level, and the judgment is needed to be carried out by relying on a complex algorithm or an additional sensor, so that the complexity and the cost of the system are increased. In addition, the existing torque detection system generally outputs signals with pulse frequency or without direction separation, and the back-end processing circuit needs to perform complex signal conditioning and resolving, so that the response speed is limited, and the overall reliability of the system is reduced. Disclosure of Invention In order to solve the above problems, an object of the present invention is to provide a torque detection circuit and system for a rotating shaft, which can directly demodulate the torque magnitude and direction from the hardware level, reduce the back-end processing load, and provide a torque detection system with high anti-interference capability. The invention is realized by the following technical scheme: a rotary shaft torque detection circuit with torque direction recognition, the input end of which is connected with a sensor probe, and the output end of which is connected with a microcontroller, comprising: The zero-crossing comparison circuit is used for converting the induction signals output by the sensor probes into two paths of pulse square wave signals; The input end of the signal filtering circuit is connected with two paths of outputs of the zero-crossing comparison module through an exclusive-or gate and is used for converting two paths of pulse square wave signals into direct-current voltage signals; the input end of the phase discrimination module is connected with the output end of the signal filtering module, and is used for processing the direct-current voltage signal according to the phase difference between output signals of the two front-end sensor probes, so that the voltage value corresponds to the torque value and the voltage polarity corresponds to the torque direction; And the input end of the signal conditioning module is connected with the output end of the phase discrimination module, and is used for conditioning and standardizing the amplitude of the second direct-current voltage signal output by the phase discrimination module and outputting a torque detection signal of which the voltage amplitude range is matched with the preset input range of the microcontroller. Further, the signal processing module comprises a signal amplification processing module and a zero point adjusting module; The input end of the signal amplification processing circuit is connected with the output end of the phase discrimination module and is used for amplifying the second direct