A Radial Hybrid Magnetic Bearing for Thin Disk Rotors

Abstract

The invention discloses a radial hybrid magnetic bearing of a slice rotor. The radial hybrid magnetic bearing is characterized in that the slice rotor is sleeved with a radial stator disc in a hollow manner, and the radial stator disc is composed of a radial stator cylinder and three radial stator pieces, and the three radial stator pieces are successively fixed on the inner wall of the radial stator cylinder along the axial direction; a first axial cavity is arranged between a first radial stator piece and a second radial stator piece, a second axial cavity is reserved between the second radial stator piece and a third radial stator piece, and radial control coils are arranged in the two axial cavities; the slice rotor is composed of a rotor magnet yoke and a permanent magnet, the rotor magnet yoke is coaxially closely nested outside the permanent magnet, and the permanent magnet is of a hollow cylinder shape and is radially filled with magnetism; the permanent magnet provides static bias flux, the radial control coils provide radial control magnetic flux, and the radial control magnetic flux and the static bias flux are overlapped at radial gaps. The radial hybrid magnetic bearing provided by the invention has the advantages that a radial magnetism filling permanent magnet is adopted, the spaces of the radial control coils are reduced, and the radial bearing capacity is increased.

Description

technical field [0001] The invention belongs to the field of electrical transmission equipment, and is a non-contact magnetic suspension bearing, in particular a radial hybrid magnetic bearing with a sheet rotor, which can be used as a 5-degree-of-freedom magnetic bearing, flywheel system, machine tool electric spindle, centrifuge and other high-speed transmission components. Non-contact suspension support. Background technique [0002] The hybrid magnetic bearing provides the static bias magnetic flux by the permanent magnet and the control magnetic flux by the DC signal, which has the advantages of reducing the control current and loss. However, because the hybrid magnetic bearing adopts DC control, and the DC power amplifier is expensive and bulky, a radial magnetic bearing usually needs four unipolar or two bipolar power amplifier circuits, so that the radial magnetic bearing is bulky , the high cost greatly limits its application. At present, permanent magnetic bias r...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing radial magnetic bearings such as complex structure, small bearing capacity, and large loss, and provide a radial hybrid magnetic bearing with thin-plate rotors that is light in weight, large in load capacity, low in power consumption, and wide in application fields

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