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Safe and reliable of inverter is directly related to the normal operation of permanent magnet synchronous motor drive system. Therefore, in the paper, taking a 12.5kW Permanent Magnet Synchronous Motor (PMSM) as the research object, two-dimensional transient electromagnetic field calculation model based on vector control strategy is established, and the corresponding assumptions and boundary conditions...
A low voltage prototype of the controlled shunt reactor (CSR) of transformer type is developed and tested in order to study the magnetic characteristics of the CSR. The coupled magnetic circuit and electric circuit method is proposed to analyze the dynamic magnetic characteristics of the CSR. In this paper, the magnetic characteristics of the CSR are analyzed in frequency domain and time domain.
The special hysteresis characteristics of a laminated core (LC) under AC-DC Hybrid magnetization are obtained by test. The field-circuit coupled time-periodic finite-element method (TPFEM) combined with the fixed-point method is used to calculate the exciting current and magnetic field of the LC based on the DC-biased magnetizing curve. The behavior of LC with no-load and different loads under AC-DC...
The DC biased problem of the Epstein Frame-like core model is investigated by using the Harmonic Balance Finite Element Method (HBFEM). It considers coupling between the electric circuit and the magnetic field. The magnetizing current and its harmonic components can be calculated directly in the harmonic domain. Comparing the calculated results with the experimental data shows consistency. The DC...
The harmonic balance finite element method (HBFEM) is combined with the fixed-point technique to calculate the steady-state magnetic field in a laminated core model (LCM). The magnetic intensity is divided into linear and nonlinear parts in the form of harmonics. The hysteresis model based on the consuming function is taken into account in the harmonic computation. The magnetic field and magnetizing...
Well casing integrity is vital for the safe operations of oil wells, and also significant to detect well casing defects. Magnetic flux leakage (MFL) detection technology is widely-used in detecting the defects of various pipelines. Owing to the very complicated environment where well casing is laid in, the system which based on magnetic flux leakage technology is not mature yet to detect well casing...
Well casing integrity is important for the safe operations of oil wells, and is of great significance to detect well casing defects. Magnetic Flux Leakage (MFL) Detection Technology is widely used to detect the defects of various pipelines. Because the environment where well casing is laid in is usually very complicated, the system which based on magnetic flux leakage technology is not mature yet...
To get higher control performance, the fuzzy control strategy is applied in the control system of linear induction motor(LIM). In accordance with the model of LIM based on vector control, the speed of LIM is controlled by fuzzy speed controller, the magnetic thrust and the magnetic flux are controlled by fuzzy magnetic thrust controller and fuzzy magnetic flux controller. Simulation and experiment...
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