CN100430168C - Manufacturing Technology of Radial Magnetic Suspension Bearing Structure - Google Patents

Abstract

The invention relates to a method for producing radial magnetic suspension bearing, wherein it comprises preparing stator that using mould to punch the silicon steel plate into pi-shape structure, then layering the silicon steel plates into magnetic pole, arranging four poles to form a circle; using upper and lower clamping plates to fix the layered sheets to obtain the radial stator; then producing rotor that using mould to punch the silicon steel plate into ring; then layering the annular silicon steel plates into one muffle to be compressed and fixed, processing the inner hole and sheathing it on the corn rod, machining external round to obtain the rotor.

Description

Manufacturing Technology of Radial Magnetic Suspension Bearing Structure

1. Technical field

The invention relates to a manufacturing process of a radial magnetic suspension bearing.

2. Background technology

Active magnetic suspension bearing is a new type of high-performance bearing that uses electromagnetic force to suspend the rotor in space and realize non-contact support between the rotor and the stator. Compared with traditional rolling bearings and sliding bearings, active magnetic suspension bearings have two advantages: 1. There is no mechanical contact, no lubrication system, and no oil leakage pollution; 2. The supporting force is controllable. Therefore, the active magnetic suspension bearing can not only be used in special working environments such as high speed, vacuum, ultra-clean and extreme temperature and pressure; it can also use its controllable supporting force to actively compensate the vibration of the rotor, reduce the vibration of the system, and improve The performance of the system has broad application prospects.

When the active magnetic bearing is working, the magnetic field strength in the magnetic circuit is constantly changing, so there are hysteresis loss and eddy current loss in the magnetic bearing stator and rotor. In order to reduce hysteresis loss and eddy current loss, the stator and rotor of the magnetic suspension bearing adopt a laminated structure, that is, the magnetic circuits of the stator and rotor are laminated with compressed silicon steel sheets. Due to the influence of processing, the magnetic permeability of silicon steel sheets is anisotropic, and its direction is consistent with the processing direction of the material. If the anisotropy of the material is not paid attention to when laminating the silicon steel sheets, the reluctance of the magnetic circuit in each degree of freedom will be uneven, which will affect the performance of the magnetic suspension bearing. In order to reduce the influence of the anisotropy of the silicon steel sheet, the processing direction of the original material of each silicon steel sheet is rotated at a certain angle relative to the adjacent sheet when stacked, so that the characteristic direction of the material in the entire stack is within the entire circumference Uniform distribution makes the entire laminations appear isotropic, making the magnetic field distribution of the magnetic suspension bearing more uniform. The magnetic circuits of the two degrees of freedom of the traditional radial magnetic suspension bearing stator are connected. The electromagnetic field finite element analysis of the magnetic bearing stator with this structure shows that there is a large magnetic field coupling between the two degrees of freedom of the magnetic bearing. This will lead to mutual coupling of the levitation forces on the two degrees of freedom of the magnetic levitation bearing, which increases the difficulty of controller design.

3. Contents of the invention

The object of the present invention is to propose a structure and manufacturing process of a radial magnetic suspension bearing with uniform magnetic field distribution, small magnetic circuit coupling, simple process and low cost.

The purpose of the present invention can be achieved by the following designs:

Radial Magnetic Suspension Bearing Stator: First, the silicon steel sheet is stamped into a Π-shaped structure through a special mold, and then a certain number of Π-shaped silicon steel sheets are stacked together to form a magnetic pole, and the same four magnetic pole group laminations are evenly distributed to form a circle. The laminations are fixed by the upper and lower splints, which becomes the stator of the radial magnetic suspension bearing.

Radial Magnetic Suspension Bearing Rotor: First, the silicon steel sheet is stamped into a ring through a special mold, and then a certain number of circular silicon steel sheets are stacked together and packed into a sleeve made of non-magnetic material for compression and fixing, and the inner hole is processed And it is heat-fitted on a mandrel, and then its outer circle is processed to the required size to obtain the radial magnetic suspension bearing rotor.

The positive effect of the present invention is:

The invention simplifies the processing technology of the radial magnetic bearing, reduces the magnetic field coupling between each degree of freedom, reduces hysteresis loss and eddy current loss, and weakens the influence of material anisotropy on the distribution of the magnetic field.

4. Description of drawings

Fig. 1 is a lamination diagram of a magnetic bearing stator of the present invention.

Fig. 2 is a sectional view of the bearing stator lamination tooling of the present invention.

Fig. 3 is a combined position diagram of laminations and tooling of the present invention.

Fig. 4 is the bearing stator structure of the present invention.

Label name among Fig. 4: 1 is splint, and 2 is lamination.

Fig. 5 is a lamination diagram of the bearing rotor of the present invention.

Fig. 6 is a cross-sectional view of the bearing rotor lamination tooling of the present invention.

Fig. 7 is a drawing of the bearing rotor lamination clamping tooling of the present invention.

Label name among Fig. 7: 2 is laminated sheet, and 3 is special clamp.

Fig. 8 is a diagram of the bearing rotor of the present invention.

5. Specific implementation

The shape of the radial magnetic suspension bearing stator laminations is shown in Figure 1. The lamination is stamped with a special die, and its thickness and size are determined according to the specific application. The lamination can be produced in batches with high efficiency and low cost. Accompanying drawing 2 is a cross-sectional view of the tooling used when stacking radial magnetic suspension bearing stator laminations. Its main function is to ensure that the four groups of silicon steel laminations are evenly distributed in the circumferential direction, and the inner holes of the laminations are basically on a circle. The assembly relationship between silicon steel laminations and tooling is shown in Figure 3. A certain number of silicon steel laminations are stacked together according to the assembly relationship shown in Figure 3, and then two splints processed by non-magnetic materials are used to compress the laminations, and the two splints 1 and laminations 2 are fixed with rivets, as shown in Shown in accompanying drawing 4. Finally, the tooling is taken out, and the inner and outer circles and end faces of the fixed laminations are processed to the size required by the design.

The shape of the radial magnetic bearing rotor lamination is shown in Figure 5. The lamination is processed by a special mold, and its thickness and size are determined according to the specific application. The rectangular tooth in the inner hole of the lamination is consistent with the processing direction of the original material of the lamination, and is used to determine the characteristic direction of the material. Accompanying drawing 6 shows the tooling used when stacking the rotor laminations, the teeth on the laminations are the same size as the slots on the tooling. When stacking the rotor laminations, the teeth on the laminations are inserted into the slots on the tooling, and the teeth of each lamination are rotated through one slot in a fixed direction (such as clockwise) relative to the underlying one and placed. In this way, the characteristic directions of the entire lamination are evenly distributed on the entire circumference, which can alleviate the problem of uneven magnetic field distribution caused by material anisotropy. The laminations are stacked to the required thickness, loaded into a special fixture and pressed tightly, as shown in Figure 7. Then send it to the factory to process its end face and inner hole to the required size. The final assembly is shown in Figure 8.

Claims (1)

1, a kind of manufacturing process of axial magnetic bearing structure is characterized in that:

(1) manufacturing process of radial magnetic bearing stator is:

(a) at first silicon steel sheet is struck out H type structure by particular manufacturing craft;

(b) rammed ∏ type silicon steel sheet is superimposed together formation magnetic pole;

(c) with identical circle of the uniform composition of four magnetic poles, with two non-magnet material clamping plate (1) up and down four magnetic poles are fixed, make the stator that magnetic circuit cuts off mutually between the magnetic pole with the little radial magnetic bearing of magnetic circuit coupling;

(2) manufacturing process of radial magnetic bearing rotor is:

(a) at first by particular manufacturing craft silicon steel sheet is struck out annular, every silicon steel sheet endoporus all has a rectangular teeth, and the rectangular teeth direction is consistent with the machine direction of silicon steel sheet original material;

(b) will strike out mode that ring-shaped silicon steel sheet turns over groove frock on respect to a slice down along fixed-direction according to the tooth of every lamination and be superimposed together to pack into and be fixed in the sleeve of being made by non-magnet material, fixing back processing endoporus also installs on the plug in the hot jacket mode;

(c) the ring-shaped silicon steel sheet cylindrical on the above-mentioned plug of processing, the rotor of the anisotropic radial magnetic bearing of silicon steel sheet that is eliminated.

Images