An investigation to general characteristics of impulse magnetizer. II. Field modeling and thermal modeling of magnetizing fixture

This paper describes field modeling and thermal modeling for magnetizing fixture. As the detailed characteristics of magnetizing fixture can be obtained, the efficient design of a magnetizer which produces the desired magnet will be possible using such modeling. For field modeling, finite-element analysis (using the MAXWELL two-dimensional field simulator) is used as part of the design and analysis process for the magnetizing fixture. The thermal modeling method of the magnetizing fixture resistor uses a multi-lumped model with equivalent thermal resistance and thermal capacitance. Reliable results are obtained by using an iron core fixture (stator magnet of car air-cleaner DC motor) coupled to a middle-voltage magnetizer (charging voltage: 1200 V, capacitor bank: 4000 μF)