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Control method for radial magnetic bearing

A control method and technology of magnetic bearing, applied in the field of magnetic bearing, can solve the problems of poor performance of suppressing impact disturbance of magnetic bearing, large magnetic leakage of radial magnetic bearing with large air gap, etc., so as to increase suspension force, reduce magnetic leakage, and improve stability sexual effect

Active Publication Date: 2017-02-22
格瑞拓动力股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of large magnetic flux leakage in the existing large-gap radial magnetic bearing and the poor performance of the existing magnetic bearing in suppressing impact disturbance. The present invention provides a control method for radial magnetic bearings

Method used

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  • Control method for radial magnetic bearing
  • Control method for radial magnetic bearing
  • Control method for radial magnetic bearing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Embodiment 1: as figure 1 As shown, the large-gap radial magnetic bearing of the divided stator in this embodiment includes four stators 1 and rotor cores 2; the four stators 1 are evenly distributed around the rotor core 2 along the circumferential direction, and the four stators 1 There is no closed magnetic circuit between them; there is a radial air gap between each stator 1 and the rotor core 2, and a closed magnetic circuit is formed.

[0076] Such as figure 2 As shown, the stator 1 in this embodiment includes two axially placed armature teeth 1-2 and a stator core 1-1, and the stator core 1-1 and two armature teeth 1-2 form an "arcuate" structure .

[0077] Working principle: The bias flux and control flux generated by the radial force control winding pass through the stator core 1-1 and the upper armature teeth 1-2-1, and then radially flow through the radial air gap of the active bearing. Then it flows axially downward through the rotor iron core 2, then ra...

Embodiment 2

[0080] Embodiment 2: In this embodiment, the large-gap radial magnetic bearing of the segmented stator includes four stators 1 and rotor cores 2; the four stators 1 are evenly distributed around the rotor core 2 along the circumferential direction, and the four stators 1 There is no closed magnetic circuit between them; there is a radial air gap between each stator 1 and the rotor core 2, and a closed magnetic circuit is formed.

[0081] Such as image 3 As shown, the stator 1 in this embodiment includes three axially placed armature teeth 1-2 and a stator core 1-1, and the stator core 1-1 and three armature teeth 1-2 form a "bow" structure .

[0082] Working principle: The radial force of the upper armature tooth 1-2-1 controls the bias magnetic flux and control magnetic flux generated by the winding, passes through the stator core 1-1 downward, and then flows to the middle armature tooth 1-2- 3. Then flow radially through the radial air gap of the active bearing, then flow...

Embodiment 3

[0086] Embodiment 3: as Figure 4 As shown, the large-gap radial magnetic bearing of the divided stator in this embodiment includes three stators 1 and rotor cores 2; the three stators 1 are evenly distributed around the rotor core 2 along the circumferential direction, and the three stators 1 There is no closed magnetic circuit between them; there is a radial air gap between each stator 1 and the rotor core 2, and a closed magnetic circuit is formed.

[0087] The structure of the stator 1 is the same as that of the first embodiment.

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PUM

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Abstract

The invention provides a control method for a radial magnetic bearing, belongs to the technical field of magnetic bearing, and aims to solve the problem that an existing magnetic bearing is poor in shock disturbance resistance. According to the control method, the radial magnetic bearing is controlled by adopting the control capacity of a viscoelastic controller; the control capacity output by the viscoelastic controller is represented by a formula: u=G(S)e=Gc(S)e+GVCL(S)e, wherein Gc(S) represents a transfer function of an existing active controller; GVCL(S) represents the transfer function of a viscoelastic control law; the transfer function GVCL(S) of the viscoelastic control law is represented by FORMULA (shown in description), wherein Cj represents a damping coefficient of the viscoelastic control law; Kj represents an elastic coefficient of the viscoelastic control law; kj represents a disturbance rejection coefficient of the viscoelastic control law; kj is larger than 1 and smaller than or qual to 10; n represents the quantity of branches of the viscoelastic control law and is larger than or equal to 1; in the formula, e represents a feedback error signal of the radial magnetic bearing. The control method provided by the invention is capable of improving the stability of a rotor of the magnetic bearing and the performance of restraining shock disturbance with relatively large destructive power.

Description

technical field [0001] The invention relates to a large-gap radial magnetic bearing, in particular to a large-gap radial magnetic bearing with a segmented stator, and belongs to the technical field of magnetic bearings. Background technique [0002] The large air gap radial magnetic bearing is a radial magnetic bearing with a radial air gap width greater than 2 mm and less than 10 mm. The armature teeth of the large-gap radial magnetic bearing in the prior art are evenly distributed radially around the rotor, and there is a closed magnetic circuit between the armature teeth. Due to the small outer diameter of the radial magnetic bearing rotor, when there are many armature teeth, the distance between each armature tooth is small, resulting in large magnetic flux leakage between teeth. [0003] However, the existing methods for preventing impact disturbances of magnetic bearings are mainly to cooperate with mechanical protection bearings and elastic dampers to prevent impact ...

Claims

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Application Information

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IPC IPC(8): F16C32/04
CPCF16C32/044
Inventor 宋立伟李书培崔总泽叶晶
Owner 格瑞拓动力股份有限公司
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