Direct-driving type torque motor

Abstract

The invention discloses a direct-driving type torque motor. The torque motor comprises a rotating shaft, a front end cover, a rear end cover, a machine shell, a rotor, a stator and a plurality of permanent magnets. The rotor is of a cylindrical structure and is mounted on the rotating shaft, the stator is fixed to the machine shell, the rotating shaft, the rotor and the stator are sequentially and coaxially arranged, the permanent magnets are of a strip-shaped structure, the cross section of each permanent magnet is a sealed pattern formed by sequentially connecting a first arc, a first straight line, a second arc and a second straight line, each closed pattern is symmetric relative to the straight line of the corresponding first arc and the straight line of the corresponding second arc, the curvature of each first arc is larger than that of the corresponding second arc, the permanent magnets are evenly arranged on the outer wall of the rotor, and are parallel to a central shaft of the rotor, and the face where the second arc in each permanent magnet is located is tightly attached to the outer wall of the rotor. According to the torque motor, the torque pulsation and the vibration noise of the motor can be effectively reduced, the demagnetization effect on the permanent magnets in flux-weakening control and torque output of the motor at low speed are ensured, the tooth groove torque ripple is effectively reduced, and the machining precision is improved.

Description

technical field [0001] The invention belongs to the technical field of torque motors, and more specifically relates to a direct drive torque motor. Background technique [0002] Existing torque motors are mainly divided into traditional servo motors and direct drive torque motors. [0003] Although the mechanical transmission chain in the traditional servo motor has good static stiffness, it will produce elastic deformation, friction and backlash when completing the motions such as starting, accelerating, decelerating, reversing and parking, which will cause mechanical vibration and motion response. Slow, poor dynamic stiffness and other nonlinear errors make it difficult to achieve high-precision machining. Compared with the traditional servo motor, the direct drive torque motor directly drives the CNC turntable, which eliminates the consumption and limitation caused by the intermediate mechanical transmission mechanism, and can directly provide torque to the actuator, wit...

AI Technical Summary

Problems solved by technology

[0003] Although the mechanical transmission chain in the traditional servo motor has good static stiffness, it will produce elastic deformation, friction and backlash when completing the motions such as starting, accelerating, decelerating, reversing and parking, which will cause mechanical vibration and motion response. Slow, poor dynamic stiffness and other nonlinear errors, it is difficult to achieve high-precision machining

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