Axial electromagnet bearing

Abstract

The invention discloses a permanent magnet polarization axial electromagnet bearing, which is compact in structure, simple in manufacture process, large in executive force contribution and high in electricity efficiency. The axial electromagnet bearing is provided with a polarization permanent magnet (1), stator cores (3), a rotor sucking disc (4) and a gap (5). A high magnetic flux density small pole (6) and a low magnetic flux density big pole (2) are both arranged on the stator cores (3) on two sides of the rotor sucking disc (4), polar area ratio is smaller than and equal to 0.5, the polarization permanent magnet (1) is absorbed between the high magnetic flux density small pole (6) and the low magnetic flux density big pole (2), polarity of the high magnetic flux density small pole (6) on the two sides is same, the high magnetic flux density small poles (6) axially face to the rotor sucking disc (4) and are linked through a winding iron core (7), and a concentrated winding (8) is located in a radial space of the rotor sucking disc (4) and located in a cavity of winding iron core (7). The axial electromagnet bearing of the structure is small in volume, particularly the axial dimension is small enough, support of an axis-free outer rotor is effective, manufacture is simple, force contribution is big, the permanent magnet is safe and lose no magnetism, magnetism stiffness is big, reliability is strong, and efficiency is high.

Description

technical field [0001] The invention relates to an electromagnetic force suspension bearing, in particular to an axially active electromagnetic bearing with external control current permanent magnetic bias, which is used for non-contact magnetic force support of rotors or non-rotating parts. Background technique [0002] Magnetic bearings are generally divided into two categories: active and passive. Active refers to the type that inputs electric energy from the outside and generates control force. For example, 200510011272.2 is a low-power permanent magnet bias axial magnetic bearing, which is the mainstream of magnetic bearings; The control force is achieved by the conversion of the motion energy of the loaded parts, such as superconducting magnetic bearings, dynamic damping bearings such as US patent US6304015 magneto-dynamic bearings and permanent magnetic repulsion bearings. According to Enshaw's theorem, the entire suspension stabilization system cannot be constructed ...

AI Technical Summary

Problems solved by technology

For example, the Chinese patent 200710135188.0 permanent magnet bias axial radial magnetic bearing is a relatively compact hybrid electromagnetic bearing, sharing a pair of bias permanent magnets, but its axial size is not small enough

200510011272.2 A low-power permanent magnet bias axial magnetic bearing. An excitation air gap is set on the side of the bias permanent magnet. It is also a magnetic short-circuit channel for the bias permanent magnet, resulting in a low utilization rate of the permanent magnet. The characteristic is that all magnetic poles are Participate in work that produces execution

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