Investigation and Analysis of Voltage By Wavelet Denoising Algorithm for HTS NI Coil Excited by Rotating Flux Pump

High temperature superconducting (HTS) no-insulation (NI) magnet excited by rotating flux pump has the characteristics of high current density, high field stability and small volume, which is in accordance with the development trend of MRI/NMR equipment for main magnet. In poor electromagnetic environment, however, quench detection of direct electrometric method based on threshold judgment is easily interfered by noise and severely disrupted quench signal may cause wrong quench determination and malfunction of quench protection, thereby resulting in unnecessary loss. To suppress the influence of the noises caused by current fluctuation and the rotation of motor on the correction of quench determination or accurate reading of data. Therefore, this paper compares and analyzes the experimental and filtering data detected by equipment based on wavelet de-noising algorithm, and verifies the necessity of using wavelet filtering data.