A comparative study of cost estimation of magnetizer system

A magnetizer system is used to produce a high current impulse in a magnetizing fixture for magnets of the various shapes. In the case of capacitor-type magnetizer system, a magnet is magnetized by the discharging current of capacitors. Also, in the case of an SCR-type magnetizer system, a magnet is magnetized by the magnetizing current using a positive pulse by the turn-on of the SCR. The price of today´s two-type magnetizer system is relatively expensive. This paper describes a method for the cost reduction estimation of a two-type magnetizer system. The authors used a cost reduction structure that consisted of four or five major subsystems. Especially, they estimated the potential for cost reductions in magnetizer systems as a function of time using the learning curve. Reliable results are obtained by using an 8-pole fixture (rotor ferrite magnet of brushless DC motor) coupled to a medium-voltage magnetizer (charging voltage 1200 V; capacitor bank 2000 μF [400 μF, 500 V in serial and parallel connection])