Non-contact type large clearance magnetically-actuated method

Abstract

A non-contact large-clearance magnetically driving method comprises an active magnetic pole and a driven magnetic pole. The active magnetic pole is a U-shaped iron core with fixed position. Each pole of the U-shaped iron core is respectively provided with two coils with electric power conducting controlled by a sequential circuit. The coils are controlled to switching and switching-off according to the prescribed sequence to lead to that the state of magnetic field of two magnetic poles is switched circulatingly according to the prescribed sequence to generate a magnetic field coupling with the driven magnetic poles (permanent magnets) which are arranged at the upper part of the U-shaped iron core of the active magnetic pole to drive the driven magnet (permanent magnet) to rotate. The invention has the advantages of simple technique, reasonable structure, fixed position of the active magnetic pole, large effective clearance between the active magnetic pole and the driven magnetic pole, adjustable rotating speed and direction, being able to replace the mechanical transmission and good practicability. The method of the invention can be applied to industrial practice and is especially suitable for driving the intracardiac miniature blood pump. The method of the invention settles the insufficiency for providing energy driving power to the intracorporal blood pump driving system currently.

Description

technical field [0001] The invention relates to magnetic force transmission technology, in particular to a non-contact large-gap magnetic drive method. Background technique [0002] In 1940, British Charles and Geoffrey Howard used magnetic drive pumps for the first time to solve the leakage problem of chemical pumps with dangerous media; in 1983, with the advent of high-performance neodymium-iron-boron (NdFeB) permanent magnet materials, the rapid Development provides materials for key components. [0003] Permanent magnet gears first appeared in the 1980s. Japanese scholars K.Tsurumoto and S.Kikuchi proposed a magnetic gear made of permanent magnets, which are axially multi-pole magnetized to circular rare earth permanent magnet materials, and formed in There are permanent magnet gears with N poles and S poles spaced apart on the end face of the ring body, and the two permanent magnet gears face each other to realize transmission. [0004] Japanese scholar Koji Ikuta pro...

AI Technical Summary

Problems solved by technology

[0007] The research and application of the above-mentioned magnetic drive technology are all based on small gaps. This is mainly because the alternating magnetic field is generally generated by rotating permanent magnets. The rotation of permanent magnets is generally directly driven by AC or DC motors. When the main and slave magnetic poles are coupled When the distance increases, the external magnetic field of the system must be enhanced to a certain extent in order to maintain the driving ability of the large gap transmission; and when the magnetic field of the permanent magnet is particularly strong, it will be coupled with the internal magnetic field of the AC or DC motor that drives its rotation. The influence of the motor is very obvious, and the motor is easily damaged. Therefore, under the condition of high speed and large gap, the current driving method cannot guarantee the normal operation of the driving system for a long time

Therefore, under the condition that the magnetic field strength of the permanent magnet is limited, the research and application of the above-mentioned magnetic drive technology cannot overcome the problem of rapid reduction of the transmission torque in the case of a large gap

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