Abstract: Due to the electrical characteristics of the DC brushless fans with different motors are various, it is difficult to find the appropriate PSpice models for them in PSpice simulation software. The designers should be establish or revise models, which is a complicated process. This paper proposes a new method for establishing the PSpice model of DC brushless fan quickly, which according to the real work parameters. The simulation model with high precision could be established easily by this method, and it provides a way to solve the problem of shortage in PSpice model storehouse.

Key words: DC brushless fan, PSpice, driving circuit, simulation, duty ratio