Three phase hybrid magnetic bearing of three-freedom and two-slices

Abstract

The invention of a new type of 3-DOF mixed pairs thin three-phase AC magnetic bearings, high-speed rotating machinery applicable to the 3-DOF suspension support. Take a permanent magnet ring at the same time as two thin magnetic bearings provide radial bias flux, divided into inner rotor, rotor structure and structure, internal and external structure of the rotor windings by the radial, at both ends of the thin sheet rotor, stator left flakes, circular Magnet, and the right, such as a thin stator 3-DOF exchanges mixed magnetic bearings; its axial freedom because of the thin radial magnetic bearings based on the principle of the permanent magnet motor thin bias passive role under control passive suspension of the stronger the magnetic bearings at the same time has a strong self-coordination function; two thin radial magnetic bearing with a tri-polar structure of a three-phase windings AC excitation, without axial control which also axial and radial coupling smaller axial suspension of its strong for both axial and radial interference or the presence of environmental load, and so they have greater applicability.

Description

technical field [0001] The invention belongs to the field of electric transmission (mechanical transmission) equipment, and specifically refers to a new type of three-degree-of-freedom double-sheet three-phase AC hybrid magnetic bearing, which is suitable for three-degree-of-freedom suspension supports of various high-speed rotating machines, and belongs to electric transmission control equipment. technology field. Background technique [0002] At present, magnetic suspension bearings (referred to as magnetic bearings) are divided into three types: active magnetic bearings, passive magnetic bearings and hybrid magnetic bearings (permanent magnetic bias) according to the way the magnetic force is provided. The hybrid magnetic bearing uses the magnetic field generated by the permanent magnet to replace the static bias magnetic field generated by the electromagnet in the active magnetic bearing, which can greatly reduce the power consumption of the power amplifier, reduce the a...

AI Technical Summary

Problems solved by technology

However, both the axial and radial directions need to be controlled at the same time. Due to the existence of DC excitation in the excitation control, the control is more complicated, the control performance is difficult to improve, and the loss is relatively large.

The existing all-permanent passive magnetic bearings are difficult to meet the requirements of high-precision fields such as high-speed machine tools in terms of stability and anti-interference ability in three degrees of freedom.

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