CN201178341Y - Motor rotor structure - Google Patents

Abstract

The utility model relates to a motor rotor structure, its characterized in that includes: an axis which is a cylindrical long rod body; the magnet fastening pieces are thin round plate bodies, the center of each magnet fastening piece is provided with a central hole through which the shaft center can penetrate, at least two fastening grooves are arranged on the peripheries of the magnet fastening pieces, and the fastening grooves penetrate through the peripheries of the magnet fastening pieces and are in a dovetail groove-like shape with a large inside and a small outside; at least two magnets are in a buckling groove shape corresponding to the magnet buckling pieces and are embedded and fixed in the magnet buckling pieces. Therefore the utility model discloses not only the equipment is quick, convenient, does not have the problem of accumulative tolerance more, does not need too strict requirement size precision, and magnet cramp and magnet gasket all can punch forming manufacturing production moreover, can simplify production processing procedure, reduce cost.

Description

Motor rotor structure

technical field

The utility model relates to a motor rotor structure, in particular to a motor rotor structure with few parts and components, simple structure and no need for too strict requirements on dimensional precision, so as to reduce production cost.

Background technique

As shown in FIG. 1 , the conventional brushless DC motor rotor structure includes a plurality of magnets 10 , a plurality of silicon steel sheets 20 , a plurality of fixing bolts 30 and two end cover plates 40 .

Wherein, the magnet 10 is an arc-shaped plate body, and its two sides are formed with symmetrical slopes 11, so that the sides of the two magnets 10 can form a dovetail groove 12 when they are kept in parallel at an appropriate distance.

The silicon steel sheet 20 is a thin circular plate, with a central hole 21 in the center for an axis (not shown) to penetrate, and a plurality of equidistant circular holes 22 arranged around the periphery, and the circular holes 22 are adjacent to the silicon steel sheet. A notch 23 with a width smaller than that of the round hole 22 is provided on the periphery of the hole 20 , and the width of the notch 23 corresponds to the minimum width of the dovetail groove 12 .

The fixed bolt 30 corresponds to the cylinder of the round hole 22, and the side has a convex rib 31 with a width approximately equal to the notch 23. The outer edge of the convex rib 31 forms a dovetail block 32, and the two side edges of the dovetail block 32 have slopes corresponding to the slope 11 of the magnet 10. 33, and the two ends have end slopes 34 respectively.

One side of the end cover plate 40 has a plurality of positioning protrusions 41 that can be accommodated in the dovetail groove 12 , and the positioning protrusions 41 have a slope 42 corresponding to the slope 34 at the end of the dovetail block 32 .

As shown in Figure 2, during assembly, the fixing bolt 30 is inserted in the round hole 22 of the silicon steel sheet 20 to connect them in series, and then the inclined surface 11 of the magnet 10 and the inclined surface 33 of the dovetail block 32 are coated with an adhesive, Then the inclined surface 11 of the magnet 10 is slid in along the inclined surface 33 of the dovetail block 32 to form a wedge fit between the dovetail block 32 and the dovetail groove 12 and be adhered and fixed.

The positioning protrusion 41 slope 42 of the end cover plate 40 and the fixed bolt 30 end slope 34 are also coated with adhesive respectively, and the positioning protrusion 41 is nested in the dovetail groove 12 between the two magnets 10, so that the positioning protrusion The slope 42 of 41 is glued and fixed to the end slope 34 of the fixing bolt 30 .

However, this conventional brushless DC motor rotor structure has the following disadvantages:

(1) There are many parts and complex structures: in the conventional structure, the fixing bolts must first be inserted into the circular holes of the stacked silicon steel sheets, and then the dovetail slots formed by the parallel arrangement of the dovetail blocks and the magnets are used for wedge fit. The two end cover plates are respectively fixed on the ends of the magnet, and an adhesive must be applied between the components to fix them, and the assembly process is quite cumbersome.

(2) High dimensional precision requirements: Due to the large number of components in the conventional structure, the cumulative tolerance during assembly will be large, so the dimensional precision requirements for components are also relatively high.

(3) High production cost: This conventional structure includes at least three production processes. The first process is to produce silicon steel sheets by stamping. The second process is to produce fixing bolts and end cover plates by injection molding. The third process The magnets are produced by wire cutting, so the production cost remains high.

Contents of the invention

In view of the above problems, the main purpose of this utility model is to provide a motor rotor structure, which not only has few parts and components, but also has a simple structure, and does not require too strict dimensional precision, so that the production cost can be reduced.

In order to achieve the above purpose, the utility model adopts the following technical solutions: a motor rotor structure, which is characterized in that it includes: an axis, which is a long cylindrical rod body; The central hole for the axis to pass through is provided with at least two buckle grooves on the periphery, and the buckle grooves run through the periphery of the magnet buckle, and are in the shape of a dovetail groove with a large inside and a small outside; at least two More than two magnets are in the shape of buckle grooves corresponding to the magnet buckle pieces and are embedded and fixed therein.

In the above-mentioned technical solution of the utility model, two magnet spacers are sleeved on the shaft center, and the two magnet spacers are in the shape of a thin circular plate body and stop at the two ends of the magnet respectively, and the center has a A central hole for passing the shaft.

In the above-mentioned technical solution of the present invention, the magnet buckle is made of magnetically conductive material.

In the above-mentioned technical solution of the present invention, the inner diameter of the central hole of the magnet buckle is approximately equal to the outer diameter of the shaft, and is in a tight fit with the shaft.

In the above-mentioned technical solution of the present invention, the inner diameter of the center hole of the magnet spacer is approximately equal to the outer diameter of the shaft, and is in tight fit with the shaft.

In the above-mentioned technical solution of the present invention, there is a plane inside the buckle groove, and the magnet is provided with a flat surface corresponding to the plane of the buckle groove, and an adhesive is applied therebetween to bond and fix it.

In the above-mentioned technical solution of the present invention, one side of the magnet is in an arc convex shape, and the arc convex shape faces the outside of the buckle groove.

In the above-mentioned technical solution of the present invention, the convex curvature of the magnet is smaller than the outer diameter of the magnet buckle, and its curvature center is staggered from the center of the axis.

Adopting the above-mentioned technical scheme, after the magnets are embedded in the stacked magnet buckle grooves of the utility model, the combination between the two can be fixed by applying adhesive, or can be fixed by two magnet spacers to stop at the two ends of the magnets. , not only the assembly is fast and convenient, but also there is no problem of cumulative tolerance, so there is no need to strictly require dimensional precision. Moreover, both the magnet buckle and the magnet spacer of the present invention can be produced by stamping and forming, which can simplify the production process and reduce the production cost.

Description of drawings

Fig. 1 is the exploded schematic view of conventional structure;

Fig. 2 is a schematic sectional view of a conventional structure;

Fig. 3 is the exploded schematic view of the utility model;

Fig. 4 is the assembly schematic diagram of the utility model;

Fig. 5 is a schematic sectional view of the utility model;

Fig. 6 is a schematic cross-sectional view of the utility model.

Detailed ways

The structure, characteristics and effects of the present utility model will be described in detail in conjunction with the following embodiments in conjunction with the accompanying drawings.

As shown in Figure 3, a motor rotor structure provided by the utility model includes:

A shaft center 50, in the form of a cylindrical long rod;

A plurality of magnet clasps 60 are made of a thin circular plate and made of magnetically conductive material. There is a central hole 61 in the center. The buckle grooves 62 (shown as four in the figure), the buckle grooves 62 must run through the periphery of the magnet buckle plate 60, and form a similar dovetail groove shape with a large inside and a small outside, and a plane 63 is arranged in the buckle groove 62.

At least two or more magnets 70 (four are shown in the figure) are a long plate body, one side of which is a flat surface 71 corresponding to the plane 63 of the buckle groove 62, and the other side is in a convex shape.

The second magnet spacer 80 is a thin circular plate with a center hole 81 in the center. The inner diameter of the center hole 81 is approximately equal to the outer diameter of the shaft 50 .

As shown in Fig. 4 and Fig. 5, when the utility model is assembled, the shaft center 50 is first passed through the center hole 61 of the stacked magnet clips 60, and the center hole 61 and the shaft center 50 form a tight fit.

Then apply adhesive to the flat surface 71 of the magnet 70, so that the magnet 70 slides in from the side of the stacked magnet buckle 60 along the buckle groove 62, and the flat surface 71 sticks against the plane 63 fixed on the magnet buckle 60, And it is embedded and fixed in the way of wedge fit.

Finally, it is also possible to add two magnet spacers 80 to respectively sleeve and stop at the two ends of the magnet 70, and the central hole 81 of the magnet spacer 80 and the shaft center 50 are also in a tight fit, which can further ensure the fixed position of the magnet 70. Will not fall off when spinning at high speed.

In addition, as shown in Figure 6, after the magnet 70 of the present utility model is fitted and fixed on the buckle groove 62 of the magnet buckle 60, the side of the arc convex shape must face outward, and the arc convex curvature of each magnet 70 must be less than The outer diameter of the magnet buckle 60, and its center of curvature must not be located in the center of the axis 50, so that the arc-convex curvatures of the magnets 70 are not located on the same circumference, so that the magnetic torsion of the magnets 70 is small and the lines of force are concentrated.

Therefore, the utility model has the following advantages compared to the conventional structure:

(1) Fewer components and simple structure: After the utility model embeds the magnet into the buckle groove of the stacked magnet buckle, the following two methods can be used to make the two firmly combined. One is to use an adhesive to stick the magnet to the buckle groove Among them, the second is to use two magnet pads to stop at the two ends of the magnet respectively. Both methods have the advantage of easy assembly.

(2) There is no need to strictly require dimensional precision: since the utility model has few parts and components, there is no problem of cumulative tolerance, so there is no need to strictly require dimensional precision.

(3) Reduce production cost: Both the magnet buckle and the magnet spacer of the present invention can be produced by stamping and forming, so the production process can be simplified and the production cost can be reduced.

In summary, many features of the present utility model are first among similar products.

The above is only a preferred implementation form of the utility model, and all equivalent structural changes made by using the specification, claims or drawings of the utility model shall be included in the patent protection scope of the utility model.

Claims (8)

1. A motor rotor structure, characterized in that it comprises: One axis, in the form of a cylindrical long rod; A plurality of magnet clasps, in the form of a thin circular plate, with a central hole in the center for the shaft to pass through, and at least two clasp grooves on the periphery, and the clasp grooves pass through the periphery of the magnet clasp , and is in the shape of a dovetail groove with a large inside and a small outside; At least two or more magnets are in the form of buckle grooves corresponding to the magnet buckle and are embedded and fixed therein. 2. The motor rotor structure according to claim 1, characterized in that: the shaft center is sheathed with two magnet spacers, and the two magnet spacers are in the form of thin circular plates and are respectively blocked by the magnets. The two ends have a central hole in the center of which the shaft can pass through. 3. The motor rotor structure according to claim 1, characterized in that: said magnet buckle is made of magnetically permeable material. 4. The motor rotor structure according to claim 1, characterized in that: the inner diameter of the center hole of the magnet buckle is approximately equal to the outer diameter of the shaft, and is in tight fit with the shaft. 5. The motor rotor structure according to claim 2, characterized in that: the inner diameter of the central hole of the magnet spacer is approximately equal to the outer diameter of the shaft, and is in a tight fit with the shaft. 6 . The motor rotor structure according to claim 1 , wherein there is a plane inside the buckle slot, and the magnet is provided with a flat surface corresponding to the plane of the buckle slot, and an adhesive is applied therebetween to fix it. 7 . The motor rotor structure according to claim 1 , wherein one side of the magnet is in an arc convex shape, and the arc convex shape faces to the outside of the buckle slot. 8. The motor rotor structure according to claim 7, characterized in that: the arc-convex curvature of the magnet is smaller than the outer diameter of the magnet buckle, and its curvature center is staggered from the center of the axis.

Images