Magnetic steel fixing structure of rotor shaft of high-power ultrahigh-speed permanent magnet motor

Abstract

The invention provides a magnetic steel fixing structure of a rotor shaft of a high-power ultrahigh-speed permanent magnet motor. The magnetic steel fixing structure comprises a non-magnetic metal sheath, wherein at least two discontinuous grooves are formed in an inner ring surface of the non-magnetic metal sheath in a concaved mode, and magnetic steel is embedded into each groove; and the non-magnetic metal sheath is arranged on the outer surface of the rotor shaft in a tight-fit sleeving mode, and the inner surface of the magnetic steel and the outer surface of the rotor shaft are tightly attached. Through the magnetic steel fixing structure, the magnetic steel can be firmly located, and therefore shaking of the magnetic steel can be avoided; and moreover, since the non-magnetic metal sheath is made of metal, the magnetic steel fixing structure is high in structural strength and not prone to damage and has long service life. Besides, the non-magnetic metal sheath of an integrated structure can shield penetration of a harmonic magnetic field generated by a stator into the magnetic steel, and export of heat in the magnetic steel is benefited.

Description

technical field [0001] The invention relates to a high-power ultra-high-speed permanent magnet motor, in particular to a magnetic steel fixing structure for a rotor shaft. Background technique [0002] Such as figure 1 Shown is the structural principle diagram of the existing high-power ultra-high-speed permanent magnet motor. The rotor shaft 1 is rotatably connected to the machine base 5 through the thrust bearing 2, the magnetic suspension bearing 3 and the auxiliary bearing 4. A stator 6 is also fixed on the seat 5, and the winding on the stator 6 is energized to drive the rotor shaft 1 to rotate and output torque. [0003] Such as figure 2 , image 3 As shown, the rotor shaft 1 is covered with a plurality of magnetic steels 11, the magnetic steels 11 are separated by magnetic isolation bridges 12, and the outer sides of the magnetic steels 11 are fixed by carbon fiber sleeves or non-magnetic metal sleeves 13. [0004] As the power of the permanent magnet motor incre...

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Problems solved by technology

[0004] As the power of the permanent magnet motor increases, the radius of the rotor shaft 1 also increases, so the centrifugal force received by the magnetic steel 11 also increases geometrically, and the carbon fiber sleeve or non-magnetic metal sleeve 13 may break. The probability is also increasing, and serious damage to the permanent magnet motor will be caused

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