Radial-axial mixed magnetic bearing driven by radial quadrupole biphase alternating current

Abstract

The invention discloses a radial-axial mixed magnetic bearing which is driven by a radial four-pole two-phase AC. A permanent magnet is in cirque type and filled with magnetism in radial direction andis embedded into a cirque concave trough at the internal side of an axial stator and closely connected with the external side of the radial four-pole stator; meanwhile, the permanent magnet providesradial magnetic bias flux and an axial magnetic bias flux; the axial stator adopts a dual-piece eight-pole radial-axial dual magnetic pole surfaces structure with two pieces multiplied by four poles;the four poles of the radial stator are uniformly distributed along the circumference and arranged between the axial stator magnetic poles which face to each other axially; a rotor is sheathed on a rotation shaft by the overlapping and pressing of a cirque silicon sheet, forms an axial air gap with the axial stator and a radial air gap with the radial stator and the axial stator; axial control coils which face to each other axially are connected in series to generate an axial control flux when getting electricity; each radial control coil is enwound on two axial stator magnetic pole external coils which face to each other axially and generates a racial control flux when getting the electricity. The invention has the advantages of reducing the volume of a power amplifier, reducing the costof the power amplifier, simplifying a driving control method, and improving the working efficiency of the magnetic bearing.

Description

technical field [0001] The invention belongs to the technical field of electromechanical transmission equipment, and relates to the field of magnetic bearings without any mechanical contact, in particular to a new radial-axial hybrid magnetic bearing driven by radial four-pole two-phase AC, which is suitable for various The three-degree-of-freedom suspension support of rotating machinery can be used as a non-contact suspension support for rotating parts in mechanical equipment such as five-degree-of-freedom magnetic levitation high-speed machine tool electric spindle systems. Background technique [0002] With the rapid development of magnetic bearing technology in the 1970s, magnetic bearing researchers at home and abroad focused on the study of active axial single-degree-of-freedom and radial two-degree-of-freedom magnetic bearings. The signal provides both static bias flux and control flux. Any stable rotating system rotor needs to impose constraints on its five degrees ...

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Problems solved by technology

The axial hybrid magnetic bearing of patent 5 also adopts an axial stator disc structure, and the control coils are respectively placed between two axial stator discs, and an axial air gap is formed between the rotor and the axial stator and radial stator respectively. and radial air gap, but does not specify how many poles are used

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