Motor rotating shaft and magnetic levitation motor

Abstract

The invention provides a motor rotating shaft and a magnetic levitation motor. The motor rotating shaft comprises a front short shaft (1), a rear short shaft (2), a front magnetic suspension bearing (3), a rear magnetic suspension bearing (4), magnetic steel (5) and a sheath (6), the front magnetic suspension bearing (3) sleeves the front short shaft (1), the rear magnetic suspension bearing (4) sleeves the rear short shaft (2), the sheath (6) sleeves the front short shaft (1) and the rear short shaft (2), the magnetic steel (5) sleeves the sheath (6) and located between the front short shaft(1) and the rear short shaft (2), the front short shaft (1) and / or the rear short shaft (2) are / is made of magnetic conductive materials, and a first axial gap (7) is arranged between the magnetic steel (5) and the front short shaft (1), and / or, a second axial gap (8) is arranged between the magnetic steel (5) and the rear short shaft (2). According to the motor rotating shaft, the output of the magnetic suspension bearing can be increased while the interference of the magnetic field of the magnetic steel ring on the magnetic field of the magnetic suspension bearing is effectively avoided.

Description

technical field [0001] The present application relates to the field of motor technology, in particular to a motor shaft and a magnetic levitation motor. Background technique [0002] High-speed permanent magnet synchronous motor has many advantages such as high power density, good dynamic response and simple structure, and has become one of the research hotspots in the international electrotechnical field. However, the permanent magnets in the rotor generally use sintered NdFeB permanent magnet materials. Since this permanent magnet material is compressive and not tensile, in order to ensure that the permanent magnets have sufficient strength at high speeds, a layer of permanent magnets is generally wrapped around the permanent magnets. The high-strength rotor sheath, the rotor sheath and the permanent magnet adopt an interference fit to ensure that the permanent magnet still bears a certain compressive stress during operation, thereby ensuring the safe operation of the high...

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Problems solved by technology

[0004] The disadvantage of this kind of three-section shaft design is that the front and rear short shafts can only use non-magnetic materials, because if the magnetic steel rings are made of magnetic materials, the magnetic leakage magnetic circuit will be formed in the axial direction, which will cause the magnetic suspension bearings at both ends of the shaft to rotate. The interference of the magnetic field will increase the difficulty of magnetic suspension bearing control and reduce the control accuracy of magnetic suspension bearings; while the use of non-magnetic materials for the front and rear short shafts will limit the magnetic circuit of magnetic suspension bearings, making it easier for magnetic suspension bearing rotors to reach saturation and reduce bearings. Contribute

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