Coreless permanent magnet synchronous linear motor based on double-layer winding structure

Abstract

The invention discloses a coreless permanent magnet synchronous linear motor based on a double-layer winding structure. The coreless permanent magnet synchronous linear motor comprises a two-sided long secondary stage and a short primary stage; the long secondary stage is of a two-sided Halbach permanent magnet array structure; permanent magnets are mounted oppositely to provide an air-gap magnetic field; and the short primary stage is encapsulated by double-layer integrated coils, and is mounted in an air gap via a sliding guide rail. The motor provided by the invention has many characteristics of the coreless permanent magnet synchronous linear motor; moreover, the volume of the primary stage of the motor is reduced, the usage of a coil material is reduced, the winding coefficient of thecoils is improved, the average thrust density of the coreless motor is improved and the advantages of a concentrated winding and a distributed winding are combined well; and thus, the coreless permanent magnet synchronous linear motor is applied to an accurate positioning system that operates continuously for a long time as well as a precision machining platform.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous linear motors, in particular to an ironless permanent magnet synchronous linear motor based on a double-layer winding structure. Background technique [0002] Since there is no limitation of the winding iron core, the ironless permanent magnet synchronous linear motor has the advantages of low thrust fluctuation, fast response speed, and convenient control, so the ironless permanent magnet synchronous linear motor is widely used in precise positioning systems, including laser scanning , chip manufacturing and other industrial applications. Since there is no winding iron core, the air gap magnetic field is mainly determined by the arrangement of permanent magnets, and its air gap magnetic field is also easy to control. At the same time, due to the weak magnetic field strength of the winding due to the ironless structure, the average thrust density of the ironless permanent mag...

AI Technical Summary

Problems solved by technology

A common method is to use distributed windings instead of centralized windings. Although this method can greatly increase the winding coefficient of the coil, the ends of the coils overlap each other and take up more space.

The complex distributed winding structure is not convenient for coil winding and primary production and installation. At the same time, the excessively long end consumes more coil material, resulting in an increase in the overall resistance of the coil and a corresponding increase in the copper loss of the motor.

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