Modular vernier permanent magnetic linear motor based on Halbach permanent magnetic structure

Abstract

The invention discloses a modular vernier permanent magnetic linear motor based on a Halbach permanent magnetic structure. The modular vernier permanent magnetic linear motor comprises 3k mover modules and one stator, there are air gaps between the two, the stator comprises a permanent magnet which is provided with a stator core, is surface-mounted to the stator core and has a Halbach array structure, armature windings are arranged in grooves of the mover modules, positions of each phase of the armature windings in the different mover modules are different, positions of axles of the same phase of the armature windings in each module correspondingly relative to the stator permanent magnet are maintained consistent, each module can work as an individual complete vernier permanent magnetic linear motor, two adjacent mover modules are connected by use of a magnetic barrier made of a non-magnetic material, the different mover modules respectively generate push forces with certain phase differences with the stator, through modular combination of movers and variation of positions of the windings in the different modules, each phase of the windings is enabled to have a completely symmetric structure in an overall view, and thus the effect of offsetting and weakening thrust fluctuations is realized.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet motors, and in particular relates to a modular vernier permanent magnet linear motor based on a Halbach permanent magnet structure. [0002] technical background [0003] CNC machine tools, especially high-performance machine tools, are important manufacturing equipment in the industrial field. Many high-precision industrial fields such as aerospace, high-speed rail, precision instruments, etc. largely depend on the technical level of high-performance machine tools. With the development of advanced electromagnetic design, modern control theory and microelectronics technology, the feed speed, acceleration and positioning accuracy of the linear servo system have been greatly improved, and it is getting more and more attention and application in the field of machine tools. The bottleneck restricting the linear AC servo motor mainly lies in the thrust density and thrust fluctuation of the lin...

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Problems solved by technology

[0006] In view of the above defects, the present invention provides a modular vernier permanent magnet linear motor based on the Halbach permanent magnet structure, which aims to solve the problems of low output thrust density and large thrust fluctuation of existing permanent magnet linear motors.

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