Mixed radial magnetic bearing of permanent magnetic rotor

A permanent magnet rotor and mixed radial technology, applied in the direction of magnetic bearings, bearings, shafts and bearings, can solve problems such as open-loop instability and achieve good system stability

Inactive Publication Date: 2016-10-12
TIANJIN EMAGING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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  • Mixed radial magnetic bearing of permanent magnetic rotor
  • Mixed radial magnetic bearing of permanent magnetic rotor
  • Mixed radial magnetic bearing of permanent magnetic rotor

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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with the examples, the following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0017] Such as figure 1 As shown, the permanent magnet 1 adopts axial magnetization, one end is an N pole, and the other end is an S pole. The permanent magnet 1 is installed on the rotor mandrel 2, and the outer ring of the permanent magnet 1 is provided with a high-strength sheath 3, whose function is to restrain the permanent magnet 1 and the mandrel 2 when they rotate at high speed, and bear the force of the permanent magnet 1. centrifugal force. The magnetic levitation radial bearing cores 4, 5, 6, 7 and the electromagnetic coils 8, 9, 10, 11 respectively form 4 sets of electromagnets, which function to generate electromagnetic force to attract or repel the rotor Function, the magnetic pole direction of the electromagnet is respective...

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Abstract

The invention relates to a hybrid radial magnetic bearing containing permanent magnets. The rotor is changed into a rotor including permanent magnets. The stator iron core of the magnetic suspension radial bearing is an electromagnet, and an electromagnetic coil is arranged on the electromagnet. A set of radial bearings is composed of more than 4 and even numbered radial bearing stators, which are evenly distributed along the circumference. The coils on each radial bearing are fed with direct current in a specific direction. The permanent magnet is magnetized in the axial direction, and the magnetic levitation radial bearing core and the electromagnetic coils arranged on it form a number of electromagnets distributed along the circumference of the rotor. Or the role of repulsion, so that the rotor is in a state of balance. The magnetic pole directions of the electromagnets are respectively determined by the current directions in the electromagnetic coils arranged thereon. Compared with traditional magnetic bearings, the present invention can reduce the volume of a single electromagnet core, thereby reducing the volume of the entire magnetic suspension bearing, and 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C32/04
CPCF16C32/044F16C2202/40
Inventor 俞天野沙宏磊毕刘新项海铭洪申平
Owner TIANJIN EMAGING TECH
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