Permanent magnet synchronous motor weak magnetic speed expansion rotor structure for tangential magnetization

Abstract

The invention discloses a permanent magnet synchronous motor flux-weakening and speed-expanding rotor structure for tangential magnetization. Each permanent magnet is provided with a magnetic isolation assembly, an iron core block and an elastic body, the magnetism isolating assembly of each permanent magnet comprises an inner side magnetism isolating base, and the inner side magnetism isolating base is fixedly inserted into a rotor iron core and is provided with an iron core mounting groove; an iron core block is movably mounted in the iron core mounting groove, the iron core mounting groove of the inner side magnetism isolating base and the corresponding permanent magnet mounting groove extend along the same radial direction, and the iron core block is connected with the inner side of the permanent magnet through the elastic body. When the actual rotating speed of the rotor is higher than the rated rotating speed, the iron core block compresses the elastic body outwards and at least partially penetrates out of the iron core mounting groove of the inner side magnetism isolating base outwards in the radial direction and makes contact with the rotor iron core, the part, passing through the iron core block, of magnetic flux generated by the permanent magnet is increased, the part, passing through a motor air gap, of the magnetic flux is correspondingly reduced, and the winding electromotive force is reduced, so that the flux-weakening high-speed operation is automatically realized, and the engineering requirement of wide-range speed regulation is met.

Description

technical field [0001] The invention relates to the field of motor technology, in particular to a rotor structure for field weakening and speed expansion of a permanent magnet synchronous motor with tangential magnetization. Background technique [0002] Permanent magnet synchronous motors have the advantages of high efficiency, high torque / power density, etc. In recent years, with the improvement of the performance of permanent magnet materials, the decline of production costs and the improvement of motor design and manufacturing technology, they have been widely used in electric vehicles, machinery manufacturing, Aerospace, robotics and other industries, at the same time, these industries have put forward a wide range of speed regulation requirements for motors. [0003] The magnetic field inside the permanent magnet synchronous motor is established by permanent magnets, and the torque includes permanent magnet torque generated by permanent magnet excitation and reluctance...

AI Technical Summary

Problems solved by technology

[0004] The traditional field-weakening speed expansion achieved by direct-axis current will lead to increased motor loss, increased temperature, and reduced efficiency. At the same time, the permanent magnet is also facing the danger of demagnetization due to high temperature and strong armature reaction.

[0005] Patent documents CN201811293000.X, CN201810328802.3 and some literatures propose a rotor structure with weak magnetic field and speed expansion, which essentially reduces the permanent magnet torque component and increases the reluctance torque component, which undoubtedly reduces the torque / power density and high Efficiency operation, lost the advantages of permanent magnet synchronous motor, the design of the rotor also tends to be complicated

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