Inner rotor hybrid magnetic bearing of horizontal coil and composite structure thereof

Abstract

The invention relates to an inner rotor hybrid magnetic bearing of horizontal coil and a composite structure thereof. The hybrid magnetic bearing comprises a rotor and a stator, wherein the rotor contains an inner magnetically conductive ring and a rotor core which is sleeved on the outside of the inner magnetically conductive ring coaxially; the stator contains a stator disk, an upper magnetically conductive cover plate, a lower magnetically conductive cover plate and a plurality of electromagnetic coils; the stator disk contains an upper magnetically conductive pole plate, a lower magnetically conductive pole plate, a magnetic cylinder mounting disk and a permanent magnet; the upper magnetically conductive cover plate and the lower magnetically conductive cover plate are arranged on and under the stator disk respectively and symmetrically; the electromagnetic coils are sleeved on the upper magnetically conductive cover plate and the lower magnetically conductive cover plate respectively, and each two electromagnetic coils which are arranged up and down symmetrically are opposite to one magnetic pole. The rotor is arranged in the stator; and the magnetically conductive cover plates are separately divided into four magnetic pole structures along the circumferential direction which are arranged radially, and the inner edges of the magnetic poles are connected to form a complete ring. The inner edges of the magnetic poles of the magnetic bearing of the invention are connected to form one complete ring and construct a uniform radial pole, thus greatly reducing the eddy current loss during the operation of the rotor.

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.

Images