Abstract
Angular displacement sensor with shared magnetic field has strong environmental adaptability and high measurement accuracy. However, its 3-D structure is multi-pole double-layer structure, using time stepping finite element method (TSFEM) to optimize the structure is time-consuming and uneconomical. Therefore, a magnetic equivalent loop method (MELM) is proposed to simplify the optimal design of sensors. By reasonably setting the node position, the mechanical structure parameters, winding coefficients and input voltage of the sensor are integrated into a mathematical model to calculate of the induced voltage. The calculation results are compared with the simulation results, and a sensor prototype is made to test the optimized effect of the MELM.
Highlights
Angular displacement measurement widely exists in aircraft, ships and automobiles
A magnetic equivalent circuit method (MELM) proposed in this paper greatly reduces the time of structural optimization, and the optimization results have been verified
In order to judge whether the magnetic equivalent loop method is correct, a small number of simulations are needed to verify it
Summary
Angular displacement measurement widely exists in aircraft, ships and automobiles. It is the key technology that affects the performance and safety of these industrial products [1,2,3,4,5]. Time grating angular displacement sensor as a kind of inductive angular displacement sensor, considers the advantages of resolvers and inductosyns [11,12] It performs well under unfavorable conditions such as oil, water, dust, vibration, and temperature change, and is cheaper than most sensors with the same accuracy [13,14,15]. By applying excitation AC signals to the stator winding, the two inner rotors receive the same excitation magnetic field This improved sensor is called the angular displacement sensor with shared magnetic field. Compared with [17], this paper optimizes sensors with different structures and structures and principles, better measurement accuracy and stronger desire for simplified optimization. This paper solves this problem and gives a complete mathematical model, which can be applied to other magnetic field sensors.
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