Field and thermal modeling for impulse magnetizing fixture based on exact parameter estimation

A capacitor discharge impulse magnetizer is used to produce a high current impulse of short duration in a impulse magnetizing fixture for magnets of the various shapes. This paper describes a method for the exact parameter estimation of an impulse magnetizer and a method for field and thermal analysis of an impulse magnetizer using this parameter. As the detailed field and thermal characteristics of an impulse magnetizer can be obtained, the efficient design of an impulse magnetizer which produce desired magnet will be possible using this analysis procedure. As the parameter estimation method of impulse magnetizer, two different estimation methods (a method considering contact resistance and a method using air-core test coil) are presented. Also, the temperature computation of discharging circuits of an impulse magnetizer is very important since it gives some indication of the design of the magnetizing circuits. Therefore, a method for thermal analysis of impulse magnetizer is presented.