Magnetic-field modulated-type magnetic screw

Abstract

The invention discloses a magnetic-field modulated-type magnetic screw, belongs to the magnetic screw and linear magnetic gear field and relates to a contactless magnetic transmission linear driver. A rotor magnetic screw is formed by a radial magnetizing spiral permanent magnet and an electric iron bar. A linear mover is formed by a spiral electrician iron hoop and a non-magnetic material. A stator magnetic nut is formed by the radial magnetizing spiral permanent magnet and an electrician iron hoop. In the rotor magnetic screw, a permanent magnet surface is pasted to an external surface of the electric iron bar. In the stator magnetic nut, the permanent magnet surface is pasted to an internal surface of the electrician iron hoop. The linear mover is between the magnetic screw and the magnetic nut, and the three components are not contacted with each other and air gaps are arranged among the three components. Through mutual cooperation between the permanent magnet and a ferromagnetic material, an amount of the permanent magnets can be effectively reduced and simultaneously a linear stroke is added, and a thrust density and mechanical strength are increased.

Description

technical field [0001] The invention relates to a high thrust density linear drive technology, in particular to the technical fields of magnetic screw and linear magnetic gear. Background technique [0002] The magnetic screw has the characteristics of high thrust density, no contact friction, and simple maintenance, so it has a good application prospect in many fields such as aerospace, marine power generation, and artificial heart. At present, most of the research on magnetic screw is the surface-mounted magnetic screw with N and S poles alternating helically and radially magnetized by permanent magnets. However, this structure has a large amount of permanent magnets, a short linear stroke, and a long distance. During the moving stroke, the permanent magnet may be affected by the external environment, causing problems such as irreversible demagnetization. [0003] The document IEEE TRANSACTIONS ON MAGNETICS, 47(10): 4477-4480, 2011 (Analysis of a magnetic screw for high f...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a magnetic field modulation type magnetic lead screw to overcome the defects of the prior art. On the premise of ensuring reliability and economy, the magnetic lead screw has a single magnetic field modulation, a short movement stroke and a large amount of permanent magnets. The problem

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