On the modeling of impulse magnetizing fixture considering field and thermal characteristics

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 impulse magnetizer using this parameter. As detailed field and thermal characteristics of an impulse magnetizer can be obtained, the efficient design of magnetizers which produce desired magnets will be possible using the authors´ analysis procedure. As the parameter estimation method of impulse magnetizers, two different estimation methods (a method considering contact resistance and a method using an air-core test coil) are presented. Also, the temperature computation of discharging circuits of impulse magnetizers is very important since it gives some indication of the design of the magnetizing circuits. Therefore, a method for thermal analysis of an impulse magnetizer is presented.