Device for detecting rotor magnetic steel of permanent magnet motor by adopting magnetorheological fluid

Abstract

The invention discloses a device for detecting a rotor magnetic steel of a permanent magnet motor by adopting magnetorheological fluid. The device comprises a ring sleeve sleeved outside the rotor magnetic steel of the permanent magnet motor, and detection units which are uniformly arranged at the inner side of the ring sleeve. The detection unit comprises a magnetic isolation wall, a balloon is arranged on the magnetic isolation wall, and magnetorheological fluid is arranged in the balloon; a pressure sensor is arranged at the top of the balloon, a pressure head is arranged above the pressure sensor, the upper end of the pressure head abuts against the inner side of an air bag, and a locking ring is arranged outside the air bag. The device has the advantages that the balloon and the pressure head apply pressure to the balloon filled with the magnetorheological fluid, and a magnetic field at a defect position is different from a magnetic field at a normal position, so that the pressure of the detection unit at the defect position is different from the pressure at the normal position; and a computer can detect the position and the type of the defect by combining the change value of the pressure with the position information of a rotor.

Description

technical field [0001] The invention relates to the mechanical field, in particular to a motor manufacturing technology, and more specifically to a detection device for a motor rotor. Background technique [0002] The rotor of a permanent magnet synchronous motor has fixed magnetic poles, and the installation and detection of the fixed magnetic poles are directly related to the performance of the motor; there are not many detection methods for non-planar permanent magnet materials in the prior art, such as Chinese patent application No. 201710888019.8 discloses a A material contour defect detection method with both arc and straight edges is an optical detection method, specifically a detection method designed to detect surface missing corners of curved magnetic materials. The straight edge part and arc edge part are separated, and the corresponding contour defect detection methods are given respectively, which solves the problem of surface contour defect detection of materia...

AI Technical Summary

Problems solved by technology

This method requires relatively sophisticated instruments and complex calculations, and is not suitable for the actual production of motor rotors.

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