Moving-coil type electromagnetic linear actuator based on composite Halbach array

Abstract

The invention discloses a moving-coil type electromagnetic linear actuator based on a composite Halbach array. The moving-coil type electromagnetic linear actuator based on the composite Halbach arraycomprises an end cover, a coil framework, a magnet yoke, an electromagnetic coil set, a main Halbach array layer, an auxiliary Halbach array layer, an air gap, a magnetic isolation shaft and a resonance spring; the composite Halbach array comprises a main Halbach array layer and an auxiliary Halbach array layer; the main array layer is formed by alternately and closely arranging axial magnetizingpermanent magnets and radial magnetizing permanent magnets; the auxiliary array layer is formed by alternately and closely arranging axial magnetizing permanent magnets and inter-magnetic conductiveblocks; the main array layer and the auxiliary array layer are combined with each other and are fixed on the magnetic isolation shaft so as to be used as a magnetic source; the electromagnetic coil set is embedded in the coil framework so as to be adopted as a mover and can do reciprocating linear motion in an air gap; and the main Halbach array layer is located between the mover and the auxiliaryHalbach array layer; the magnet yoke and the magnetic source are fixed and serve as a stator, and a gap between the magnet yoke and the magnetic source is the air gap. According to the moving-coil electromagnetic linear actuator, the composite Halbach array is adopted, so that the self-shielding capacity of a magnetic circuit and the power density of the actuator are improved; and the moving-coilelectromagnetic linear actuator has a good control characteristic and high stability.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a moving coil electromagnetic linear actuator based on a compound Halbach array. Background technique [0002] As a driving element, the electromagnetic linear actuator can directly convert the input electrical energy into mechanical energy of linear motion, which is suitable for applications such as linear motion, large driving force and smooth feeding. The moving coil electromagnetic linear actuator has the advantages of high frequency response and high precision, so it has received extensive attention. In recent years, driven by new demands, new materials and new technologies, especially the wide application of permanent magnet materials such as sintered NdFeB, electromagnetic linear actuators have achieved greater development. [0003] In the application of electromagnetic linear actuators, the contradiction between drive requirements and limited installation space provides a...

AI Technical Summary

Problems solved by technology

Although the ordinary Halbach array can effectively enhance the magnetic flux density on one side of the permanent magnet, weaken the magnetic flux density on the other side, and improve the air gap magnetic density to a certain extent, there is still a large amount of magnetic flux leakage, and the power density of this type of electromagnetic actuator is still To be further improved

At the same time, the electromagnetic actuator based on the ordinary Halbach array requires an additional yoke to fix the permanent magnet material, which increases the difficulty of assembling the actuator.

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