Based on the analysis of the characteristic of the novel soft-switching submerged arc welding inverter by adopting saturable inductor and fully utilizing the magnetic inductance and leakage inductance of high frequency power transformer to widen soft-switching range, the structure and parameters of high frequency power transformer are designed.

A method was developed to measure the magnetic inductance in an asynchronous motor while the mechanical load is still attached to the motor.

Due to the dynamic end effect, the parameters of single sided linear induction motor (SLIM), such as magnetizing inductance, vary greatly under different operation conditions, and cannot be obtained accurately through offline parameter identification method during operation process.

Results of experiment and simulation show that,the core gap decreases both the magnetizing inductance and the coupling coefficient.

A computational method of excitation inductance of power transformer needs current of all windings.

On the basis of the operating principles for LLC resonant converter, a designing method, which employed the excitation inductance in an optimization-based LLC resonant converter to reduce the resonant current and RMS value of the secondary output current, was proposed.

Furthermore we put forward the conception of instantaneous power and instantaneous excitation inductance.

Based on the direct current biased magnetization properties for transformer core,an engineering-oriented practical method to calculate the asymmetric magnetizing current in DC biased large power transformer is presented in this paper.