A device and method for detecting instantaneous torque of a rotating shaft

Abstract

The invention discloses a rotating shaft instantaneous torque detection device and a rotating shaft instantaneous torque detection method. An alternating-current excitation and signal conditioning circuit produces excitation signals of a stress sensor A and a stress sensor B, and after signal conditioning, a wireless frequency-modulated transmission module is used to perform simulated modulated transmission, the signals are received and demodulated through a wireless receiving and demodulating module in the fixed part, the signals are reduced to torque signals through a signal reduction circuit, and finally, a voltage signal of real-time torque is output. When a rotating shaft has no torque transmission, the signal reduction circuit outputs an intermediate value of power supply voltage; when the rotating shaft has forward torque transmission, the voltage value output by the signal reduction circuit is higher than the intermediate value, and the voltage difference between the voltage value and the intermediate value is the size of positive torque produced corresponding to the transmission of the rotating shaft; and when the rotating shaft has reverse torque transmission, the voltage value output by the signal reduction circuit is lower than the intermediate value, and the voltage difference between the voltage value and the intermediate value is the size of negative torque produced corresponding to the transmission of the rotating shaft. The device and the method have the advantages of wide measurement bandwidth and good real-time performance.

Description

technical field [0001] The invention relates to electric transmission technology, electronic technology and radio communication technology, in particular to a method for detecting the output torque of a rotating shaft in a transmission system, which is used for online real-time detection of the rotating shaft torque of the transmission system in a laboratory environment. Background technique [0002] In the system testing of electric motors and internal combustion engines, the output torque of the shaft of the system reflects the basic characteristics of various power systems and is an indispensable measurement item. This measurement item is generally measured by a torque measuring instrument with a torque sensor, but the torque measuring instrument has many shortcomings: first, the signal of the torque sensor lags behind, the detection frequency is low, and the instantaneous torque ripple cannot be measured; the second is the size of the equipment Large, signal output and p...

AI Technical Summary

Problems solved by technology

This measurement item is generally measured by a torque measuring instrument with a torque sensor, but the torque measuring instrument has many shortcomings: first, the signal of the torque sensor lags behind, the detection frequency is low, and the instantaneous torque ripple cannot be measured; the second is the size of the equipment Large, signal output and power supply are wired connections, which limits its application environment

The former's analog-to-digital signal conversion process and the bandwidth of the digital signal serial transmission link limit the sampling rate of torque detection, so it is impossible to measure the high-frequency component of torque ripple; To meet the frequency requirements for measuring torque ripple, even if a higher frequency conversion is used, the amount of data after the analog-to-digital signal conversion is large; in addition, the directivity of the infrared transmission is too strong, and the data cannot be sent to the fixed device at any rotational position. Electromagnetic induction The transmission is susceptible to the strong magnetic interference of the motor, and the transmission rate is low

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