A Radial-Axial Hybrid Magnetic Bearing with Radial Six Pole Radial Outer Rotor

Abstract

The invention discloses an outer rotor radial six-pole radial-axial mixed magnetic bearing. A radial stator is sleeved with a rotor coaxially; six radial magnetic poles are evenly distributed on the outer circular surface of a radial stator yoke in the circumferential direction; a radial control coil is wound on each radial magnetic pole; and axial control coils are arranged on the sides of the two ends of the radial stator yoke correspondingly. An axial stator is composed of an axial stator cylinder in the middle, axial stator discs at the two ends and axial magnetic poles; the axial stator discs are fixedly connected at the two ends of the axial stator cylinder correspondingly; the periphery parts of the two axial stator discs both extend to the opposite side to form the circular axial magnetic poles; the two axial magnetic poles extend to the sides of the two end faces of the rotor and leave radial air gaps with the rotor; and a permanent magnet is fixedly embedded between the outer circular surface of the axial stator cylinder and the inner circular surface of the radial stator. The bearing capacity of the magnetic bearing can be improved, and coupling between two radial degrees of freedom is reduced.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing (magnetic bearing for short), especially a three-degree-of-freedom hybrid magnetic bearing of an outer rotor that can simultaneously control two radial degrees of freedom and an axial degree of freedom, and is suitable for aerospace, nuclear energy, Wind power generation, flywheel energy storage, and the support of various external rotor rotating machinery in other industrial fields belong to the field of high-speed and ultra-high-speed electric transmission. Background technique [0002] Magnetic bearings use electromagnetic force to suspend the rotor in the air, so that there is no contact between the rotor and the stator. It has the advantages of no friction, no wear, no lubricating oil, high speed support, dynamic adjustment of rotor displacement, high rotation accuracy, and long life. According to the number of degrees of freedom that can be controlled, magnetic bearings can be div...

AI Technical Summary

Problems solved by technology

However, due to the spatial asymmetry of the three-pole structure and the condition that the sum of the three-phase currents of the three-phase inverter is zero, the maximum levitation force of the radial levitation force in the direction of the magnetic pole and the opposite direction of the magnetic pole is not equal. When designing the magnetic bearing, it must be Make the direction of the minimum levitation force meet the bearing capacity requirements, which will inevitably lead to an increase in the volume of the magnetic bearing

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