CN1520004B - Combined rotor structure of brushless motor - Google Patents

Abstract

The invention relates to a combined rotor structure of a brushless motor, which comprises a rotor body made of non-magnetic conductive material with a plurality of convex ribs and a plurality of embedded small teeth which can be axially disassembled, wherein the axial small teeth are formed by stamping and stacking a plurality of silicon steel sheets which can conduct magnetism, and each small tooth is provided with a groove, the shape and the size of the groove are matched with the shape of the convex ribs of the rotor body, so that the small teeth can be axially embedded into the rotor body to be tightly sealed. And each small tooth can not move in the tangential direction or the radial direction on a plane perpendicular to the axial direction, thereby providing a stable fixing mode. Every two adjacent embedded small teeth form a permanent magnet containing hole on the surface opposite to each other, a permanent magnet can be fixedly embedded into the permanent magnet containing hole, and then rotor covers are respectively locked at the front end and the rear end of the rotor body so as to fix the permanent magnet and each embedded small tooth; the rotor structure of a brushless motor is assembled. The combined rotor structure of the brushless motor can be applied to motors with an outer stator/inner rotor motor and an inner stator/outer rotor.

Description

Combined rotor structure of brushless motor

technical field

The present invention is a combined rotor structure of a brushless motor, especially a motor rotor structure provided with embedded assembly, low processing cost and extremely stable after assembly.

Background technique

Common technology, as shown in Figure 1 Taiwan Utility Model Patent Announcement No. 327485 and Taiwan Utility Model Patent Announcement No. 412100 as shown in Figure 2, the general brushless DC motor rotor is composed of a permanent magnet 10 and a silicon steel sheet 11 The magnet is coated on the outer edge of the silicon steel sheet, and needs to match the arc shape of the inner edge of the outer stator (inner rotor/outer stator brushless DC motor) or the shell shape of the inner stator (outer rotor/inner stator without Brushed DC motor), and closely integrated with it.

Generally, the silicon steel sheet of the brushless DC motor rotor is made of silicon steel sheets of the same size and shape; when it is applied to a small diameter brushless DC motor, the processing is not a problem, but it is applied to the manufacture of a larger diameter brushless In the case of DC motors, when processing silicon steel sheets, it is necessary to use a punching machine with a large impact and waste a lot of surplus material, and the processing cost is very uneconomical. Although there are several methods of bonding permanent magnets and silicon steel sheets at present, the common structure such as the above-mentioned Taiwan Utility Model Patent Publication No. 327485 still has the problems of easy loosening of the magnets and difficulty in controlling the size. Although the Taiwan Utility Model Patent Announcement No. 327485 shown in Figure 1 and the Taiwan Utility Model Patent Announcement No. 412100 shown in Figure 2 have proposed improvements, the permanent magnets used must cooperate with the inner edge of the outer stator. It is arc-shaped and has fixed grooves on both sides, which makes the manufacturing cost of the permanent magnet very high. Moreover, the above-mentioned methods are only suitable for inner rotor/outer stator brushless DC motors, and are difficult to apply to the category of outer rotor/inner stator brushless DC motors.

In the U.S. Patent No. 5,929,120 shown in Figure 3 and the U.S. Patent No. 5,886,441 shown in Figure 4 in the common technology, although the silicon steel sheet 12 has been made of a unit body and has a permanent magnet accommodating hole 13, and The permanent magnet has also broken through the arc-shaped appearance and adopts a rectangular sheet magnet, but the fixing method of the silicon steel sheet and the rotor axis is fixed by the fixed pin and the front and rear covers of the rotor. When the silicon steel sheet is stacked for a long time, the fixed pin There will be the disadvantage of being easy to bend and deform.

Contents of the invention

Aiming at the disadvantages of common brushless DC motor rotor structure, the present invention provides a combined rotor structure of brushless motor, which includes a rotor body with a plurality of ribs and a plurality of axially detachable grooves, and its The shape and size of the groove are matched with the embedded small tooth in the shape of the convex rib of the rotor body, so that the small tooth can be embedded into the rotor body in the axial direction to provide a very stable fixing method. And every two adjacent embedded small teeth form a permanent magnet accommodating hole, which can embed and fix the permanent magnet.

One of the objectives of the present invention is to provide a brushless motor rotor structure in which the permanent magnets are embedded.

Another object of the present invention is to provide a brushless motor rotor structure, which can be applied to outer stator/inner rotor motors and inner stator/outer rotor motors.

Another object of the present invention is to provide a brushless motor rotor structure. When the combined rotor structure is applied to a motor with a smaller outer diameter, the axially embedded small teeth can be combined into a ring-shaped silicon steel sheet.

In order to achieve the above-mentioned purpose, the present invention provides a combined rotor structure of a brushless motor, which includes a rotor body made of a non-magnetic material with a plurality of convex ribs and a plurality of axially detachable embedded small teeth, The axial small tooth is formed by stamping and stacking a plurality of magnetically conductive silicon steel sheets, and each small tooth has a groove whose shape and size match the rib shape of the rotor body, so that the small tooth can It is tightly fitted by being axially embedded in the rotor body; and each small tooth cannot move in a tangential or radial direction on a plane perpendicular to the axial direction, providing a very stable fixing method. And every two adjacent embedded small teeth form a permanent magnet accommodating hole on the surfaces opposite to each other, and the permanent magnet can be embedded in the permanent magnet accommodating hole. Then the rotor cover is respectively locked on the front and rear ends of the rotor body to fix the permanent magnet and each embedded small tooth; the rotor structure of a brushless motor is combined.

As for the detailed structure of the present invention, application principle, function and effect, then can obtain complete understanding with reference to the explanation that is done according to accompanying drawing:

Description of drawings

Fig. 1 is a schematic diagram of the structural surface of the outer stator/inner rotor brushless motor stator of the common Taiwan New Patent Announcement No. 327485;

Fig. 2 is a schematic structural view of the outer stator/inner rotor brushless motor stator of the common Taiwan New Patent Announcement No. 412100;

Fig. 3 is a schematic structural view of the outer stator/inner rotor brushless motor stator of the common U.S. Patent No. 5,929,120;

Fig. 4 is a schematic structural view of the outer stator/inner rotor brushless motor stator of the common U.S. Patent No. 5,886,441;

Fig. 5 is a three-dimensional exploded view of the structure of the inner rotor/outer stator brushless DC motor of the present invention;

6 is a three-dimensional exploded view of the combined rotor structure of the inner rotor/outer stator brushless DC motor of the present invention;

7 is a schematic cross-sectional view of the structure of the inner rotor/outer stator brushless DC motor of the present invention;

Fig. 8 is a schematic enlarged view of the section F-F of the inner rotor/outer stator brushless DC motor structure of the present invention as shown in Fig. 7;

9 is a section and front view of the rotor body of the inner rotor/outer stator brushless DC motor of the present invention;

10 is a cross-sectional and perspective view of the embedded small teeth of the inner rotor/outer stator brushless DC motor of the present invention;

Fig. 11 is a three-dimensional exploded view of the structure of the outer rotor/inner stator brushless DC motor of the present invention;

Fig. 12 is a three-dimensional exploded view of the structure of the outer rotor/inner stator brushless DC motor of the present invention.

Fig. 13 is a schematic cross-sectional view of the structure of the outer rotor/inner stator brushless DC motor of the present invention.

Fig. 14 is a sectional view of the rotor body of the outer rotor/inner stator brushless DC motor of the present invention;

Fig. 15 is a cross-sectional view of the embedded small teeth of the outer rotor/inner stator brushless DC motor of the present invention.

FIG. 16 is a three-dimensional exploded view and a cross-sectional view of the combined axially embedded small teeth into a ring-shaped silicon steel sheet when the combined rotor structure of the present invention is applied to a brushless motor with a small outer diameter.

Detailed ways

The combined rotor structure of the brushless motor of the present invention can be applied to outer stator/inner rotor motors and inner stator/outer rotor motors.

(inner rotor/outer stator motor application)

As shown in Figure 5, the combined rotor structure of the brushless motor of the present invention includes a motor upper cover 21, a rotor structure 20, a stator 22, a lower cover 23 and a bearing 24 when applied to an inner rotor/outer stator brushless DC motor 2 , and as shown in Figure 6, its rotor structure includes a plurality of rotor covers 205, a rotor body 201, a plurality of rectangular permanent magnets 204 and a plurality of small silicon steel sheets 203 (see Figure 10) composed of embedded small teeth 202. Also as shown in FIG. 9 , the rotor body 201 has a plurality of ribs 2011 and is made of non-magnetic materials such as aluminum alloy, plastic, stainless steel and the like. Also, as shown in Figure 10, the axially detachable embedded small tooth 202 is formed by punching and stacking a plurality of magnetically conductive silicon steel sheets 203, and each small tooth has a groove 2031 whose shape is similar to that of The size is matched with the shape of the convex rib 2011 (Fig. 9) of the rotor body, so that the small teeth can be directly inserted into the rotor body in the axial direction and tightly fitted, and each small tooth cannot be tangentially aligned on a plane perpendicular to the axial direction. Or move in the radial direction. Comparing US Patent No. 5,929,120 and No. 5,886,441, the silicon steel sheet and the rotor axis are fixed by the fixing pin and the front and rear covers of the rotor. The present invention provides a more stable fixing method.

As shown in Figure 6, Figure 7, Figure 8, Figure 9, and Figure 10, a permanent magnet accommodating hole 2021 (Fig. The permanent magnet 204 ( FIG. 7 , FIG. 8 ) is embedded and fixed in the permanent magnet accommodating hole 2021 . Since the permanent magnet 204 adopts an embedded design, the permanent magnet does not need to match the external dimensions of the motor rotor like a traditional brushless motor, so the flexibility of the design can be greatly improved, and its assembly is extremely convenient and stable, without It will have the disadvantage that when the permanent magnet is attached to the traditional brushless motor, a clamp must be used for positioning. In addition, when the rare earth permanent magnet produced by sintering is used, the present invention can adopt a square sheet structure, which can greatly reduce the production cost of the permanent magnet. In addition, in the rotor structure of the present invention, the axially embedded small teeth used are formed by stamping and stacking a plurality of magnetically conductive silicon steel sheets. Because the rotor can be disassembled into multiple single small teeth and then embedded in the rotor body, Therefore, compared with the traditional rotor manufacturing method, the overall manufacturing process saves considerable mold cost and material cost.

Referring again to FIG. 6 , it is based on the rotor structure of the inner rotor/outer stator brushless DC motor. The assembly process is to insert each stacked embedded small tooth 202 into the rotor body 201 in the axial direction and firmly cooperate with it. Then insert the permanent magnet 204 into the permanent magnet accommodating hole 2021 (see FIG. 10 ) formed by every two adjacent embedded small teeth, and then use two rotor covers 205 to fix the rotor structure front and rear. Then assemble with other components such as stator 22, bearing 24, front cover 21, rear cover 23 as shown in Figure 5, to complete the whole inner rotor/outer stator brushless DC motor.

(inner stator/outer rotor motor application)

Referring now to Fig. 11 and Fig. 13, when the combined rotor structure of the present invention is applied to the motor 3 of the inner stator/outer rotor, the motor includes a rotor 30, a stator 31, a front cover 32, a rear cover 33 and a screw for locking 34 and nut 35. As shown in FIGS. 12 and 13 , the rotor 30 includes a rotor body 301 , a plurality of embedded small teeth 302 and a plurality of permanent magnets 304 . As shown in FIG. 14 , the rotor body 301 is also made of a non-magnetic material with a plurality of ribs 3011 , such as aluminum alloy, plastic, stainless steel, and the like.

As shown in Figure 15, the plurality of axially detachable embedded small teeth 302 are formed by stamping and stacking a plurality of magnetically conductive silicon steel sheets 303, and each small tooth has a groove 3031, and the groove The shape and size are matched with the shape of the rib 3011 ( FIG. 14 ) of the rotor body, so that the small teeth can be tightly fitted by axially inserting into the rotor body. In addition, each small tooth 302 cannot move tangentially or radially on a plane perpendicular to the axial direction, providing a very stable fixing method. And every two adjacent embedded small teeth form a permanent magnet accommodating hole 3032 (Fig. 15) on the opposite surface, and the permanent magnet 304 (Fig. 12, Fig. 13) can be embedded and fixed in the accommodating hole 3032 (Fig. 15).

The permanent magnet is embedded in the design, so the permanent magnet does not need to match the size of the motor rotor like the traditional brushless motor, and can adopt a square sheet structure, so the production cost of the permanent magnet can be greatly reduced.

As shown in Figure 15, the embedded small teeth 302 are formed by stamping and stacking a plurality of magnetically conductive silicon steel sheets 303. Because the rotor can be disassembled into multiple single small teeth, and then embedded in the rotor body, it is suitable for large For the motor, the overall manufacturing process saves considerable mold cost and material cost compared with the traditional rotor manufacturing method.

As shown in Figure 16, when the combined rotor structure of the present invention is applied to a brushless motor with a small outer diameter, in order to save the man-hours and convenience of silicon steel sheet assembly, the axially embedded small teeth can be combined into a ring Silicon steel sheet 40 to reduce the process.

The rotor body of the present invention is made of non-magnetic materials, such as aluminum alloy, plastic, stainless steel, etc. When aluminum alloy is used, it has considerable benefits in reducing the weight of the whole motor and reducing the manufacturing cost. One of the characteristics of this combined rotor structure is that the permanent magnets are embedded in the design, so the permanent magnets do not need to match the external dimensions of the motor rotor like traditional brushless motors, so the flexibility of the design can be greatly improved; and because of the permanent The magnet adopts an embedded design, which is extremely convenient and stable to assemble, and does not have the disadvantage of having to use additional fixtures for positioning when pasting permanent magnets on traditional brushless motors. In addition, when the rare earth permanent magnet produced by sintering is used, the present invention can adopt a square sheet structure, which can greatly reduce the production cost of the permanent magnet.

Another feature of this combined rotor structure is that the axially embedded small teeth used are formed by stamping and stacking a plurality of magnetically permeable silicon steel sheets. Because the rotor can be disassembled into multiple single small teeth, and then embedded in the rotor body. Therefore, compared with the traditional rotor manufacturing method, the overall manufacturing process saves considerable mold cost and material cost.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the implementation scope of the present invention. That is, all equivalent changes and modifications made according to the patent scope of the present invention are covered by the patent scope of the present invention.

Claims (5)

1. the combined rotor structure of a brushless motor, it is characterized in that: have rotor body and a plurality of embedded little tooth of axially disassembling that the non-magnet material of predetermined fin is made, this axial little tooth by a predetermined silicon steel sheet that can magnetic conduction in addition punching press pile up and form, and each little tooth has groove, its groove shapes cooperates the fin shape of rotor body with size, make the driving fit of this little tooth via axial embedding rotor body, and make each little tooth on plane perpendicular to axial direction, all can't move, very stable fixed form is provided with tangent line and radial direction; The shape structure of described each embedded little tooth is identical; The shape of each fin structure and length dimension are in full accord on the described rotor body, evenly distribute on rotor body; And per two adjacent embedded little teeth, respect to one another forms a permanent magnet containing hole, and in fixedly embedded this magnet containing hole of permanent magnet, permanent magnet quantity is identical with the fin quantity of embedded little tooth and rotor body; Then rotor enclosure is distinguished clavicle in the rear and front end of rotor body,, be combined into the rotor structure of a brushless motor to fix permanent magnet and each embedded little tooth.

2. the combined rotor structure of brushless motor according to claim 1 is characterized in that: be applied to external stator/inner rotor motor.

3. the combined rotor structure of brushless motor according to claim 1 is characterized in that: be applied to internal stator/external-rotor motor.

4. the combined rotor structure of brushless motor according to claim 1, it is characterized in that: rotor body is by forming such as non-magnet material manufacturings such as aluminium alloy, plastics, stainless steels.

5. the combined rotor structure of brushless motor according to claim 1 is characterized in that: when this combined rotor structure was applied to the motor of less external diameter, it is embedded little tooth axially, can merge into a ring-type silicon steel sheet, to reduce operation.

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