CN-121994291-A - Compensation device and compensation method of electric vortex torque angle sensor

CN121994291ACN 121994291 ACN121994291 ACN 121994291ACN-121994291-A

Abstract

The invention discloses a compensation device and a compensation method of an eddy current torque angle sensor, wherein the compensation device comprises a residual current detection unit, an electromagnetic force calculation unit, a compensation voltage signal generation unit, a driving unit and a compensation coil, wherein the residual current detection unit is used for collecting residual current signals in an exciting coil in real time and converting the residual current signals into digital current signals to be output, the electromagnetic force calculation unit is used for calculating the magnitude of electromagnetic force generated by the residual current signals according to a pre-stored mapping model, and also used for determining the acting direction of the electromagnetic force according to pre-stored winding parameters of the exciting coil and the direction of the residual current signals, the compensation voltage signal generation unit is used for generating a compensation voltage signal according to the magnitude and acting direction of the electromagnetic force, and the compensation coil is used for generating a compensation magnetic field for counteracting the electromagnetic force according to the compensation current. The invention can effectively inhibit the vibration of the angle and the torque when the sensor is static, and improves the precision of the measurement of the torque and the angle.

Inventors

ZHU WEI
XU ZELIN
HUANG YINKAI
CHEN LEI
ZHANG PENG

Assignees

苏州传祯电子科技有限公司

Dates

Publication Date: 20260508
Application Date: 20260225

Claims (10)

1. The compensating device of the electric eddy torque angle sensor is characterized by comprising a residual current detection unit, an electromagnetic force calculation unit, a compensating voltage signal generation unit, a driving unit and a compensating coil; the input end of the residual current detection unit is connected with the exciting coil of the eddy current torque angle sensor and is used for collecting residual current signals in the exciting coil in real time and converting the residual current signals into digital current signals to be output; The electromagnetic force calculation unit is connected with the output end of the residual current detection unit, and is used for calculating the electromagnetic force generated by the residual current signal according to a pre-stored mapping model, and determining the acting direction of the electromagnetic force according to pre-stored winding parameters of the exciting coil and the direction of the residual current signal; The electromagnetic force generation device comprises an electromagnetic force calculation unit, a compensation voltage signal generation unit and a control unit, wherein the input end of the compensation voltage signal generation unit is connected with the output end of the electromagnetic force calculation unit and is used for generating a compensation voltage signal according to the magnitude and the acting direction of the electromagnetic force, the magnitude of the compensation voltage signal corresponds to the magnitude of the electromagnetic force, and the acting direction of the compensation voltage signal is opposite to the acting direction of the electromagnetic force; the input end of the driving unit is connected with the output end of the compensation voltage signal generating unit and is used for converting the compensation voltage signal into compensation current; The compensation coil is coaxially arranged with the excitation coil and connected to an output terminal of the driving unit for generating a compensation magnetic field for canceling the electromagnetic force according to the compensation current.
2. The compensation device of an eddy current torque angle sensor according to claim 1, wherein the electromagnetic force calculating unit includes a second resistor and a first chip; The first end of the second resistor is used as the input end of the electromagnetic force calculation unit, the second end of the second resistor is connected with the input pin of the first chip, and the output pin of the first chip is used as the output end of the electromagnetic force calculation unit.
3. The compensation device of an eddy current torque angle sensor according to claim 2, wherein the mapping model is stored in the first chip in the form of a polynomial fitting function, the polynomial fitting function comprising a first function and a second function; the first function is used for calculating the residual current vortex of the rotor according to the residual exciting current of the exciting coil, and the specific expression is as follows: ; the second function is used for calculating the magnitude of electromagnetic force generated by the residual current vortex of the rotor according to the residual current vortex of the rotor, and the specific expression is as follows: ; Wherein I represents residual exciting current of an exciting coil, E represents residual eddy current of a rotor, and F represents electromagnetic force; 、、、、、、 And Is a fitting coefficient determined according to the model and parameters of the sensor.
4. The compensation device of an eddy current torque angle sensor according to claim 1, wherein the residual current detecting unit includes a first resistor, a current detecting chip, a first capacitor, and an analog-to-digital conversion chip; The first end of the first resistor is connected with the current output end of the exciting coil and is used as the input end of the residual current detection unit, and the second end of the first resistor is connected with the input pin of the current detection chip and is used for converting a residual current signal flowing through the exciting coil into a voltage signal; The output pin of the current detection chip is connected to the input pin of the analog-to-digital conversion chip after being filtered by the first capacitor; And an output pin of the analog-to-digital conversion chip is used as an output end of the residual current detection unit and is used for converting the voltage signal into a digital current signal and outputting the digital current signal.
5. The compensation device of the eddy current torque angle sensor according to claim 1, wherein the compensation voltage signal generating unit includes a second chip, a driver, a third resistor, a digital-to-analog conversion chip, a fourth resistor, a fifth resistor, an operational amplifier, and a second capacitor; The input pin of the second chip is used as the input end of the compensation voltage signal generation unit, and the second chip is used for receiving the magnitude and the acting direction of the electromagnetic force and generating a corresponding digital control signal; the input end of the driver is connected with the output pin of the second chip, and the output end of the driver is connected with the first end of the third resistor and used for buffering and driving the digital control signal; an input pin of the digital-to-analog conversion chip is connected with the second end of the third resistor, and an output pin of the digital-to-analog conversion chip is connected with the first end of the fourth resistor and is used for converting the digital control signal into an analog voltage signal; the first input end of the operational amplifier is connected with the second end of the fourth resistor, the second input end of the operational amplifier is connected with the first end of the fifth resistor, the output end of the operational amplifier is connected with the first end of the second capacitor and serves as the output end of the compensation voltage signal generating unit, and the operational amplifier is used for conditioning and amplifying the analog voltage signal and outputting the compensation voltage signal; the second end of the fifth resistor and the second end of the second capacitor are grounded.
6. The compensation device of an eddy current torque angle sensor according to claim 1, wherein the driving unit includes a sixth resistor, a power amplifier, and a seventh resistor; the first end of the sixth resistor is used as an input end of the driving unit, and the second end of the sixth resistor is connected with the input end of the power amplifier; The first end of the seventh resistor is connected with the output end of the power amplifier, and the second end of the seventh resistor is used as the output end of the driving unit.
7. The compensation device of an eddy current torque angle sensor according to claim 6, further comprising a protection unit connected between an output end of the compensation coil and ground for discharging a counter-induced electromotive force generated by the compensation coil.
8. A method of compensating an eddy current torque angle sensor, comprising: The residual current detection unit acquires residual current signals in an exciting coil of the eddy current torque angle sensor in real time and converts the residual current signals into digital current signals; The electromagnetic force calculation unit calculates the electromagnetic force generated by the residual current signal according to the digital current signal and a pre-stored mapping model, and determines the acting direction of the electromagnetic force according to pre-stored winding parameters of the exciting coil and the direction of the residual current signal; The compensation voltage signal generation unit generates a compensation voltage signal according to the magnitude and the acting direction of the electromagnetic force, wherein the magnitude of the compensation voltage signal corresponds to the magnitude of the electromagnetic force, and the acting direction of the compensation voltage signal is opposite to the acting direction of the electromagnetic force; The driving unit converts the compensation voltage signal into compensation current; And driving a compensation coil with the compensation current to generate a compensation magnetic field for counteracting the electromagnetic force, wherein the compensation coil and the excitation coil are coaxially arranged.
9. The method of compensating for an eddy current torque angle sensor as recited in claim 8, wherein the step of determining the direction of application of the electromagnetic force based on pre-stored excitation coil winding parameters and the direction of the residual current signal comprises: determining the polarity direction of the magnetic field according to pre-stored winding parameters of the exciting coil and the direction of the residual current signal; determining the current vortex direction according to the residual current direction; And determining the direction of the electromagnetic force according to the polarity direction of the magnetic field and the direction of the eddy current.
10. The method of compensating for an eddy current torque angle sensor as recited in claim 9, wherein the step of determining the electromagnetic force direction from the magnetic field polarity direction and the eddy current direction includes: Outputting a first stress direction when the magnetic field polarity direction is the same as the eddy current direction, and outputting a second stress direction opposite to the first stress direction when the magnetic field polarity direction is opposite to the eddy current direction.

Description

Compensation device and compensation method of electric vortex torque angle sensor Technical Field The invention relates to the technical field of electronic control of sensors, in particular to a compensation device and a compensation method of an eddy current torque angle sensor. Background The eddy current torque angle sensor is widely applied to the fields of automobile power systems, industrial precise transmission and the like by virtue of the advantages of non-contact detection, high response speed and the like. The working principle is that an alternating magnetic field is generated through a stator coil, an electric vortex is generated by cutting a magnetic field by upper and lower rotor blades, and an induction electric signal is generated by interaction of the electric vortex and the magnetic field, so that torque and angle signals are reflected through change of the induction electric signal. However, when the eddy current torque angle sensor is at rest, residual excitation current remains in the stator coils, resulting in residual eddy current in the upper and lower rotor blades. These residual eddy currents create unbalanced electromagnetic forces in the stator magnetic field, ultimately inducing angle and torque jitter errors. Currently, the prior art mainly improves the above-mentioned errors by two approaches. One is by optimizing the mechanical structure of the sensor or adjusting the magnetic field distribution, but this approach is often accompanied by increased manufacturing costs and limited cancellation of microscopic residual forces. The other is to use a simple filter circuit to post-process the output signal at the electronic level to suppress noise. However, the method can only passively filter clutter in the signal, and cannot directly detect and offset the physical source of the generated error, namely the electromagnetic force generated by the residual eddy current, so that the compensation effect on the static jitter error is poor. Disclosure of Invention The invention provides a compensation device and a compensation method of an eddy current torque angle sensor, which are used for actively generating a reverse compensation magnetic field to offset the generated electromagnetic force by detecting the residual current of an exciting coil in real time, so that the angle and torque jitter of the sensor when the sensor is stationary are effectively inhibited, and the precision of torque and angle measurement is improved. In a first aspect, an embodiment of the present invention provides a compensation device of an eddy current torque angle sensor, including a residual current detection unit, an electromagnetic force calculation unit, a compensation voltage signal generation unit, a driving unit, and a compensation coil, wherein an input end of the residual current detection unit is connected to an exciting coil of the eddy current torque angle sensor, for collecting residual current signals in the exciting coil in real time and converting the residual current signals into digital current signals for output, an input end of the electromagnetic force calculation unit is connected to an output end of the residual current detection unit, for calculating a magnitude of electromagnetic force generated by the residual current signals according to a pre-stored mapping model, and for determining a direction of action of the electromagnetic force according to pre-stored winding parameters of the exciting coil and directions of the residual current signals, an input end of the compensation voltage signal generation unit is connected to an output end of the electromagnetic force calculation unit, for generating a compensation voltage signal according to the magnitude and action direction of the electromagnetic force, wherein the magnitude of the compensation voltage signal corresponds to the magnitude of the electromagnetic force, the action direction of the compensation voltage signal is opposite to the direction of action of the electromagnetic force, an input end of the driving unit is connected to an output end of the compensation voltage signal generation unit, for converting the compensation voltage signal into compensation current, and for generating a compensation coil, which is arranged coaxially to the exciting coil and is connected to the driving compensation unit, and generates a compensation magnetic field according to the direction. Optionally, the electromagnetic force calculation unit comprises a second resistor and a first chip, wherein the first end of the second resistor is used as an input end of the electromagnetic force calculation unit, the second end of the second resistor is connected with an input pin of the first chip, and an output pin of the first chip is used as an output end of the electromagnetic force calculation unit. Optionally, the mapping model is stored in the first chip in the form of a polynomial fitting function, the polynomial fitting function compri