A three-degree-of-freedom hybrid conical radial magnetic bearing

Abstract

The invention discloses a three-degree-of-freedom mixing conical and radial magnetic bearing, and belongs to the field of magnetic suspension bearings. The three-degree-of-freedom mixing conical and radial magnetic bearing is composed of a radial magnetic bearing body and a conical magnetic bearing body; an axial magnetization annular permanent magnet or annular bias winding is arranged between the radial magnetic bearing body and the conical magnetic bearing body to provide biased magnetic flux; a radial magnetic bearing stator is of a salient pole structure and provided with four teeth; each stator tooth is wound with a coil, and every two coils are connected to form two radial suspension windings; a rotor is of a cylinder structure; the conical magnetic bearing body comprises two conical stators and two conical rotors which are each of a conical cylinder structure; an axial suspension winding is embedded between the two conical stators; the radial stator, the two conical stators and the permanent magnet are connected through a magnetic conductive ring; and the radial rotor and the two conical rotors are sleeved with a rotor magnetic conductive ring and then a rotary shaft. Control magnetic circuits of the radial magnetic bearing body and the conical magnetic bearing body are isolated, axial force and radial force are decoupled, control is simple, the structure is compact, the three-degree-of-freedom mixing conical and radial magnetic bearing can be applicable to electromagnetic bearings or permanent magnetic bias type magnetic bearings, and universality is good.

Description

technical field [0001] The invention relates to a three-degree-of-freedom mixed conical radial magnetic bearing, which belongs to the field of magnetic suspension bearings. Background technique [0002] The permanent magnetic bias magnetic bearing uses permanent magnetic materials to generate the required bias magnetic field. In addition to effectively reducing the volume of the magnetic bearing and increasing the power density, it can also significantly reduce the number of turns of the control winding and reduce the inductance of the control winding. Improve the chopping and tracking effects of the levitation current, thereby improving the high-speed levitation control accuracy, and can reduce the power loss of the magnetic bearing to a large extent. Based on the above advantages, permanent magnet bias active magnetic bearings have been widely used in the support systems of high-speed and ultra-high-speed rotating machines such as aerospace, military, and flywheel energy s...

AI Technical Summary

Problems solved by technology

[0003] However, the traditional permanent magnet bias hybrid magnetic bearing with three-degree-of-freedom suspension function requires a large thrust plate, which makes its processing and assembly difficult, and also limits the further improvement of its critical speed

In addition, due to the existence of both axial and radial magnetic circuits in the thrust plate, there is coupling between the axial levitation force and the radial levitation force, which is not conducive to the levitation control during high-speed operation, and will reduce the efficiency of levitation control. precision

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