Slotless direct-current hybrid magnetic bearing

Abstract

The invention discloses a slotless direct-current hybrid magnetic bearing. The slotless direct-current hybrid magnetic bearing comprises a stator and a rotor, and the stator comprises a left stator iron core, a right stator iron core and a permanent magnet ring. The permanent magnet ring is axially magnetized, the outer diameter of the permanent magnet ring is the same as that of the stator iron cores, and the left stator iron core is connected with the right stator iron core through the permanent magnet ring. The rotor comprises a rotor iron core and a rotating shaft. 4N circular inner grooves penetrate through the rotor iron core along the circumferential edge, one ends of two windings opposite to each other along the circumference are in short joint, and the other ends of the two windings are connected with commutator segments. The commutator segments are connected with a bipolar switch power amplifier through carbon brushes, and the rotor iron core and the stator iron cores are opposite in position to form an air gap. Static bias magnetic flux is provided by the permanent magnet ring, and corresponding bias magnetic flux is adjusted by a control magnetic flux generated by electrifying the inner groove windings in the rotor. The hybrid magnetic bearing windings of the structure are embedded in the rotor grooves, the effective area between the stator and the rotor is increased, the suspension force density is increased, and the hybrid magnetic bearing has the advantages of being compact in structure, good in stability and high in utilization rate.

Description

technical field [0001] The invention relates to a non-mechanical contact magnetic bearing, in particular to a slotless DC hybrid magnetic bearing, which can be used as a non-contact suspension support for high-speed transmission components such as a flywheel system, a machine tool electric spindle, and a centrifuge. Background technique [0002] The magnetic bearing is a new type of high-performance bearing that uses the electromagnetic force between the stator and the rotor to suspend the rotor in space, so that there is no mechanical contact between the stator and the rotor. At present, magnetic bearings are divided into the following three types according to the way the magnetic force is provided: (1) Active magnetic bearings, the bias magnetic field is generated by the bias current, and the control flux generated by the control current and the bias flux are superimposed on each other, thereby generating a controllable The levitation force of this kind of magnetic bearing...

AI Technical Summary

Problems solved by technology

[0003] The common feature of the existing hybrid magnetic bearing structure is that the stator teeth are distributed along the circumference of the stator, and the windings are wound on the stator teeth. The design of the windings of this structure involves the number of turns, the cross-sectional area of ​​the wire, the current density, etc. In the radial space, the radial magnetic pole area cannot be maximized, the radial bearing capacity is small, the axial length is long, and the critical speed is low

In addition, the air-gap magnetic density of this structure is limited by the saturation of the teeth, and cannot be increased as required

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