Research on Air Gap Disturbance Compensation for Magnetoelastic Torque Sensors

摘要:

Most of magnetoelastic torque sensors are very sensitive to air gap disturbances. To address this issue, this paper proposes two models to characterize the impact of air gaps on measurement. The magnetic circuit equation describes the impact of magnetic resistance changes caused by air gap disturbances on measurement, while the leakage flux equation describes the effective magnetic flux entering the magnetic circuit under different air gaps. Both models were subjected to finite element simulation and experimental verification, and the results obtained were very consistent with the model description, which can effectively improve the measurement accuracy, repeatability, and response frequency of the sensor.

关键词:magnetostriction;magnetic circuit;air gap disturbance;leakage compensation

Abstract:

Most of magnetoelastic torque sensors are very sensitive to air gap disturbances. To address this issue, this paper proposes two models to characterize the impact of air gaps on measurement. The magnetic circuit equation describes the impact of magnetic resistance changes caused by air gap disturbances on measurement, while the leakage flux equation describes the effective magnetic flux entering the magnetic circuit under different air gaps. Both models were subjected to finite element simulation and experimental verification, and the results obtained were very consistent with the model description, which can effectively improve the measurement accuracy, repeatability, and response frequency of the sensor.

Key words:magnetostriction;magnetic circuit;air gap disturbance;leakage compensation