Three freedom degree conical rotor AC-DC hybrid magnetic bearing

Abstract

The invention discloses a three-degree-of-freedom conical stator-rotor AC-DC hybrid magnetic bearing. Three silicon steel laminations are evenly distributed on the inner side of the stator and along the radial circumference. The separated conical magnetic poles are separated from each other. The mirror is symmetrically distributed, and the magnetic isolation aluminum ring is installed in the middle for spatial isolation; the three-phase radial control coil is wound on three separate conical magnetic poles, and the axial control coil is located in the inner cavity of the stator; the rotor is arranged to be in phase with the conical magnetic poles. Correspondingly, a working air gap is formed between the conical rotor and the conical magnetic pole. The stator of the invention adopts a double-piece six-pole (2×3) structure, the axial stator and the radial stator are shared, and the radial and axial control currents are input independently, realizing the use of the axial magnetic circuit and the radial magnetic circuit to share the same work. The air gap simultaneously controls the suspension of the conical rotor in three degrees of freedom in the axial and radial directions; the magnetic bearing structure is further simplified; the control is simple and the power loss is reduced.

Description

technical field [0001] The invention belongs to the technical field of electromechanical transmission equipment, is a field of magnetic bearings without any mechanical contact, and specifically refers to a new three-degree-of-freedom AC-DC hybrid magnetic bearing integrating axial and radial functions, which is suitable for high-speed and high-precision The suspension support of the three-degree-of-freedom rotating shaft in the operation system and the machining system. Background technique [0002] Since the rapid development of magnetic bearing technology in the 1970s, the research direction has mainly been active magnetic bearings that use DC drives to provide static bias flux and control flux at the same time, and focus on axial single degree of freedom and radial two degrees of freedom. A study of degrees of freedom magnetic bearings. A typical magnetic levitation system needs to impose constraint control in five degrees of freedom directions at the same time, and usua...

AI Technical Summary

Problems solved by technology

The magnetic bearing proposed in the above-mentioned patent application 1 is a two-piece eight-pole stator structure, and the radial control coil is driven and controlled by a DC power amplifier. Bulky and expensive

For the three-degree-of-freedom AC hybrid magnetic bearing proposed in patents 2 and 3, the radial control coil is driven by a three-phase AC inverter, and the axial control coil is driven by a DC switching power amplifier. The stator is a monolithic structure, and the stator is divided into The axial stator and radial stator are two parts, and the air gap is also divided into axial air gap and radial air gap. The disadvantages are: this structural design increases the axial length of the bearing and the critical speed of the rotor is not too high high

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