The Design Of Power Source Of Linear Motor Based On Bilateral Pulse Variable Frequency Control

For decreasing a mass of wastage of traditional rotating motor which is used to be linear driving equipment by shift rotary movement to linear movement via middle switch component, linear motor emerged as the times require. Traditional linear motor adopted spring to reset, whereas in this paper the structure and drive mode of linear motor are innovated, which secondary adopts rare-earth permanent-magnet material, driving with non-contact electromagnetic gear by altering the polarty of power supple to realize the reciprocating motion.Linear motor consists of two main parts which are motor and power supply. this subject mainly introduces the structure of motor and design of working power supply, for achieving the movement fully driven by magnetic force, power supply is designed to drive by bidirectional pulse, and PFC correcting circuit is to maintain high power factor to reduce the harmonic wave pollution to power grid. Thereinto PFC correcting circuit is to correct the phase angle of voltage and current with One-cycle control Boost circuit, as well as the converter model is constructed under DCM condition according to switched linear theory. The controllability and reachability are also analyzed hereinafter, likewise the analytical methods could be used in the analysis of Buck and Buck-Boost converter. Bidirectional pulse driving circuit controlled by SCM driving IGBT bridge circuit which chip model No. FGA25N120 as core component to design the power supply, to achieve frequency control by controlling impulse width and cycle with build-in keyboard, in the meantime over-voltage protection and over-current protection are taken into account.Now the novel linear motor of bidirectional pulse variable-frequency control is applied to drive the flow control pump successfully.The new-style structure has applied for practical novel patent. This subject been supported by the project of young talents training of Changzhou and project of tackle scientific problem of new north district of Changzhou.