Spherical three-dimensional force measurement piezomagnetic sensor and three-dimensional force measurement method thereof

Abstract

The invention discloses a spherical three-dimensional force measurement piezomagnetic sensor and a three-dimensional force measurement method thereof. The spherical three-dimensional force measurement piezomagnetic sensor comprises a force measurement mechanism, a signal excitation circuit and a signal conditioning circuit, the force measurement mechanism comprises a spherical shell, a force transmission element connected in the three-dimensional orthogonal direction of the inner surface of the spherical shell, and a piezomagnetic element connected with the force transmission element. The piezomagnetic element receives an external force applied to the spherical shell through the force transmission element; after the piezomagnetic element receives the external force, the signal excitation circuit transmits an excitation signal to the piezomagnetic element, so that the piezomagnetic element converts the external force into a non-zero induction voltage and transmits the induction voltage to the signal conditioning circuit; and the signal conditioning circuit performs signal compensation, output decoupling and component force synthesis on the induced voltage to obtain an external force value and a component force value in each direction. Loading force in all directions can be accurately detected, the bias degree of a magnetic field is increased on the basis of equal stress deformation, and therefore the complex working conditions in practical application are met.

Description

technical field [0001] The invention relates to the technical field of force measurement, in particular to a spherical three-dimensional force measuring piezomagnetic sensor and a three-dimensional force measuring method thereof. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Force sensors are widely used in construction machinery, aerospace, construction industry, automation and other fields, and there are many types, such as resistance strain gauge, semiconductor strain gauge, piezoresistive, piezoelectric and so on. Among them, compared with the strain gauge force sensor, the piezomagnetic force sensor has the advantages of strong bearing capacity, large output power, good anti-interference ability, and can maintain a good working condition under harsh environmental conditions. [0004] Piezomagnetic sensor is a kind of force and elec...

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Problems solved by technology

[0006] (1) When the existing piezomagnetic sensor is working, the excitation core can only detect the force in two dimensions, which cannot fully reflect the actual external force;

[0007] (2) When measuring the external force value, the existing piezomagnetic sensor will be affected by the working environment, which will cause the excitation voltage to fluctuate and cause measurement errors;

[0008] (3) Due to factors such as different measurement conditions or different applied external forces, the magnetic permeability changes are different, so the output induced voltage is also different. If a unified detection range is used, it is inevitable that the small induced voltage cannot be accurately obtained. value;

[0009] (4) Due to the mutual influence between the sensor structure and the magnetic fields in different directions, the output signal of the piezomagnetic sensor in each dimension will be affected by other dimensions when the piezomagnetic element measures the force component in the actual work, then The values ​​measured in this dimension are not all the components of external forces in this dimension, and there is a problem of coupling errors between multiple dimensions

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