Permanent-magnet torque motor based on Halbach array

Abstract

The invention provides a permanent-magnet torque motor based on a Halbach array. Permanent magnets of a left part and a right part of the permanent-magnet torque motor are in mirror symmetry, each side employs a structure which three permanent magnets are connected, the shapes of an upper permanent magnet and a lower permanent magnet are same, the magnetization directions of the upper permanent magnet and the lower permanent magnet are opposite along a horizontal direction, and the magnetization direction of an intermediate permanent magnet faces vertically and upwards; an intermediate part of the torque motor comprises guide magnets in a horizontal direction and a vertical direction, an armature and a coil, and gaps exist between the guide magnets of an upper part and a lower part in the vertical directions; and during working, each path of polarization flux or each path of control flux which is generated sequentially passes through the existing gaps for twice, the control flux and the polarization flux of each gap are superposed, a direction of a control current in the coil is changed, so that the armature is rotated under an electromagnetic torque in a clockwise or counter-clockwise direction. By the permanent-magnet torque motor, the magnetic leakage of the torque motor is reduced, the utilization of magnetic energy is improved, and the output electromagnetic torque is substantially improved.

Description

technical field [0001] The invention relates to the hydraulic field and the electromagnetic field, in particular to a permanent magnet torque motor based on a Halbach array. Background technique [0002] The electro-hydraulic servo valve is a key component in electro-hydraulic servo control. It is a hydraulic control valve that outputs modulated flow and pressure after receiving an analog electrical signal. The electro-hydraulic servo valve has the advantages of fast dynamic response, high control precision and long service life, and has been widely used in electro-hydraulic servo control systems in the fields of aviation, aerospace, ships, metallurgy, and chemical industry. The electromagnetic torque motor is the first stage of the electro-hydraulic servo valve. Its function is to convert the input electrical signal into a mechanical signal to deflect the armature to control the hydraulic part of the pre-stage. [0003] At present, the research on torque motors is mainly t...

AI Technical Summary

Problems solved by technology

[0005] The traditional torque motor magnet adopts a single axial magnetization, and the magnetic flux leakage at the link between the magnet and the magnetizer is serious, and the use of magnetic energy is not sufficient.

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