Hybrid magnetic bearing of rotor inside vertical coil and assembled structure thereof

Abstract

The invention relates to a hybrid magnetic bearing of a rotor inside a vertical coil and an assembled structure thereof. The hybrid magnetic bearing comprises a rotor and a stator, wherein the rotor comprises an inner magnetic conductive ring and a rotor core, wherein the rotor core is coaxially sleeved at the outer side of the inner magnetic conductive ring; the stator comprises a stator disc, a plurality of coil iron cores and a plurality of electromagnetic coils, wherein the stator disc includes an upper magnetic conductive pole plate, a lower magnetic conductive pole plate, a magnetic pillar installation disc and a permanent magnet; the plurality of coil iron cores are respectively symmetrically arranged at the upper side and the lower side of the stator disc and uniformly distributed along the circumferential direction of the stator disc, and every two coil cores which are symmetrically arranged at the top and the bottom respectively correspond to the position of one magnetic pole; the plurality of electromagnetic coils are respectively vertically sleeved on the coil iron cores; the rotor is arranged in the stator; and the magnetic conductive pole plates are respectively uniformly divided into four-magnetic pole structures in radial shapes along the circumferential direction, and the magnetic poles are connected into an integral ring on an inner edge. The magnetic poles of the hybrid magnetic bearing are connected into the integral ring so as to form radial uniform magnetic poles, therefore the eddy current loss of the rotor during operation is greatly reduced.

Description

technical field [0001] The invention relates to a non-contact magnetic suspension bearing, in particular to a hybrid magnetic bearing that can be used as a non-contact support for rotating components, and is especially suitable for non-contact support of satellite attitude control magnetic suspension flywheels and energy storage flywheels. Background technique [0002] Magnetic suspension bearings are divided into pure electromagnetic bearings and hybrid magnetic suspension bearings with permanent magnetic bias and electromagnetic control. The former must set a bias current in the electromagnetic coil to provide a working point for the magnetic bearing, so the control current is large and the power consumption is large; while In the hybrid magnetic suspension bearing with permanent magnet bias and electromagnetic control, the permanent magnet provides the main magnetic flux of the magnetic circuit and the magnetic field of the bias operating point, and bears the main bearing ...

AI Technical Summary

Problems solved by technology

[0005] Therefore, for high-speed flywheel rotors, the current hybrid magnetic bearings still have obvious technical disadvantages: on the one hand, the eddy current in the rotor core will produce a significant retarding torque, which will be significant in aerospace applications such as magnetic levitation flywheels for attitude control. Increase the power consumption of the drive motor and affect the stability and accuracy of satellite attitude control; on the other hand, when the high-speed rotor is enclosed in a high-vacuum shell in order to reduce windage loss, excessive eddy current loss will also increase the heat dissipation of the rotor design difficulties

In addition, the current hybrid magnetic bearing coil core and the working magnetic pole adopt an integrated structure, which has disadvantages such as complex structure and inability to fully utilize the circumferential area of ​​the magnetic pole.

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