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| Analysis on the axial magnetic field of multi-layer finite solenoid based on the equivalent current density model |
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Abstract In order to resolve the calibrating problem of axial Hall magnetic probe with short rob, a portable finite solenoid was proposed as the reference magnetic field generator. The axial magnetic filed was calculated to obtain its distribution based on the Biot-Savart law and superposition principle of magnetic field, by establishing the solenoid model in a cylindrical coordinate system. In addition, a finite element model (FEM) was established for the multi-layer finite solenoid to analyze its spatial magnetic filed with given exciting current. A solenoid prototype with 100mT central magnetic intensity was designed according to above theoretical analysis. The data from the ECD model, FEM and prototype testing were compared, and the results show that at the solenoid center the deviation between theoretical calculation and FEM is less than 0.1%, and it’s less than 0.8% between theoretical calculation and prototype testing. It’s demonstrated that the ECD model is effective to analyze solenoid axial magnetic field. This method is suggested to be applied in designing and optimizing parameters of a finite solenoid more efficiently and accurately.
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Received: 20 December 2023
Published: 26 September 2024
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2024, Vol. 45 
