Mixed radial magnetic bearing of permanent magnetic rotor

Abstract

The invention relates to a mixed radial magnetic bearing of a permanent magnetic rotor. A rotor is changed to a rotor comprising a permanent magnet, magnetic suspension radial bearing stator cores are electromagnets, and electromagnetic coils are arranged on the electromagnets; a group of radial bearings comprise more than four radial bearing stators in an even number and are uniformly distributed along the circumferential direction; a direct current in a special direction is electrified to the coil of each radial bearing; axial magnetization is adopted for the permanent magnet, the magnetic suspension radial bearing cores form a plurality of electromagnets which are distributed along the circumferential direction with the electromagnetic coils thereon respectively, and the electromagnets generate electromagnetic forces by connecting a power supply to attract or repel the rotor, so that the rotor is in a balanced state. The magnetic pole directions of the electromagnets are determined by the current directions of the electromagnetic coils arranged thereon respectively. Compared with a conventional bearing, the size of a single electromagnetic core can be reduced, so that the size of the whole magnetic suspension bearing is reduced, and the bearing has better system stability.

Description

technical field [0001] The invention relates to an active magnetic bearing, in particular to a hybrid radial magnetic bearing containing permanent magnets. Background technique [0002] In the existing active magnetic bearing design, the rotor is made of magnetic materials such as silicon steel sheets, and the bearing stator generates a magnetic field through an electromagnet or a permanent magnetic material, which generates an attractive force on the rotor to play a supporting role. When the rotor is suspended, the rotor is in a state of balance when it is subjected to a pair of electromagnetic attraction forces of the same magnitude and opposite directions on a straight line. Since the magnitude of the magnetic field is inversely proportional to the electromagnetic gap, when disturbed, the rotor deviates from the equilibrium position and the attractive force at both ends changes. This form of magnetic bearing has negative stiffness and is open-loop unstable. Contents of ...

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Problems solved by technology

Since the magnitude of the magnetic field is inversely proportional to the electromagnetic gap, when disturbed, the rotor deviates from the equilibrium position and the attractive force on both ends changes. This form of magnetic bearing has negative stiffness and is open-loop unstable.

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