Motor rotor and machining method thereof

Abstract

The present invention discloses a motor rotor and a processing method thereof, which comprises a rotor core, a plurality of magnetic steel blocks and a cover. The rotor core is annular in shape, and a plurality of retaining members are evenly distributed around the outer ring of the rotor core. The plurality of retaining members and the rotor core are formed into one piece by injection molding. The magnetic steel block is installed between two adjacent retaining members. A rotating sheet is provided at the upper end of the retaining member, and the retaining member is rotatably connected to the rotating sheet. The cover is detachably connected to the lower end of the retaining member. The beneficial effects of the present invention are: it is conducive to heat dissipation from the upper and lower ends of the rotor core. At the same time, when the magnetic steel block is pressed, the retaining member is easy to generate powder, which is conducive to the powder falling from the end of the rotor core, avoiding poor heat dissipation caused by accumulated powder, and improving the service life; enhancing the strength between the rotor core and the retaining member, and effectively preventing the separation of the rotor core and the retaining member.

Description

Technical Field

[0001] The present invention relates to the technical field related to motors, and in particular to a motor rotor and a processing method thereof. Background Art

[0002] In the prior art, there is an inner rotor motor in which a rotor with magnets rotates inside a coil. The rotor core is formed by laminating a plurality of steel sheets, and then a plurality of retaining members around the rotor core are integrally formed with the rotor core by injection molding, and finally a plurality of magnetic steel blocks are tightly pressed into the retaining members along the axial direction. In this process, the rotor core and the retaining members are often easily separated due to the force generated during the press-fitting. Summary of the invention

[0003] The present invention aims to overcome the problem of insufficient strength between a rotor core and a retaining member in the prior art, and provides a motor rotor capable of enhancing the strength between the rotor core and the retaining member and a processing method thereof.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A motor rotor comprises a rotor core, a plurality of magnetic steel blocks and a cover, wherein the rotor core is annular in shape, a plurality of retaining members are evenly distributed circumferentially on the outer ring of the rotor core, the plurality of retaining members are formed integrally with the rotor core by injection molding, the magnetic steel block is installed between two adjacent retaining members, the upper end of the retaining member is connected to the end of the rotor core, and the cover is detachably connected to the lower end of the retaining member.

[0006] The rotor core is in the shape of a ring, and a plurality of retaining members are evenly distributed around the outer ring of the rotor core. The plurality of retaining members and the rotor core are formed into one piece by injection molding. The magnetic steel block is installed between two adjacent retaining members, and the upper end of the retaining member is connected to the end of the rotor core, and the cover is detachably connected to the lower end of the retaining member. The plurality of retaining members are evenly distributed around the outer ring of the rotor core, which is conducive to the heat dissipation from the upper and lower ends of the rotor core. At the same time, when the magnetic steel block is pressed, the retaining member is easy to generate powder, which is conducive to the powder falling from the end of the rotor core, avoiding the accumulation of powder and causing poor heat dissipation; the magnetic steel block is installed between two adjacent retaining members by pressing, which improves the stability of the magnetic steel block; the plurality of retaining members are evenly distributed along the circumference of the rotor core, and the cover is detachably connected to the lower end of the retaining member. This design enables the magnetic steel block to achieve the purpose of enhancing the strength between the rotor core and the retaining member during the pressing process.

[0007] Preferably, the rotor core is formed by vertically stacking a plurality of steel sheets, the shape of the steel sheet is a regular polygon, and a through hole is provided at the center of the steel sheet. Since there is a gap between the steel sheets, during the injection molding process, part of the resin forming the connecting column will flow into the gap between the steel sheets, thereby improving the strength between the rotor core and the retaining member.

[0008] Preferably, the retaining member is composed of a connecting column and a fixing plate, the fixing plate is located on the inner side of the upper end of the connecting column, the connecting column is connected to the steel plate on the top surface of the rotor core through the fixing plate, a rotating plate is provided on the fixing plate, the fixing plate is rotatably connected to the rotating plate, a supporting plate is provided at the lower end of the connecting column, the connecting column is connected to the steel plate on the bottom surface of the rotor core through the supporting plate, and the connecting column, the fixing plate and the supporting plate are all formed into one piece with the rotor core through injection molding. The operator rotates the rotating plate to clamp the magnetic steel block, which improves the stability of the magnetic steel block; the design of the fixing plate and the supporting plate is conducive to enhancing the radial force of the connecting column, which can effectively prevent the separation of the rotor core and the retaining member.

[0009] Preferably, the width of the support sheet is greater than the width of the connecting column. This design facilitates the magnetic steel block to be pressed from one end of the connecting column with the fixing sheet to the other end of the connecting column with the support sheet. The design is reasonable and easy to operate. At the same time, the support sheet also plays a certain limiting role.

[0010] Preferably, the corners on one steel sheet correspond to the corners on the other steel sheets one by one, and form a straight edge in the vertical direction, the inner side of the connecting column is connected to the straight edge, and the outer side of the connecting column is provided with a covering plate, the width of the covering plate is greater than the width of the connecting column, and the covering plate, the support sheet and several steel sheets between each two adjacent connecting columns form a slot, and the magnetic steel block matches the slot and is installed in the slot. This design facilitates the press-fitting of the magnetic steel block and makes the magnetic steel block fit more closely with the rotor core.

[0011] Preferably, a card interface is formed between two adjacent support sheets, and the cover is provided with a plurality of buckles matching the card interface, and the plurality of buckles form a circle, and the buckle includes a cylinder, one end of the cylinder is fixedly connected to the cover, and the other end of the cylinder is provided with a plurality of grooves, and the plurality of grooves are evenly distributed along the circumference of the cylinder, and a card block and a spring are provided in the groove, and the card block is connected to the bottom of the groove through the spring, and the cover is installed on the lower end surface of the retainer through the card block on the cylinder and the card interface, one side of the card block is close to the cover, and the other side of the card block is far away from the cover, and a transition slope is provided on the side of the card block away from the cover, and a circular hole corresponding to the position of the through hole is provided on the cover, and the diameter of the circular hole is the same as the diameter of the through hole. The transition slope plays a certain guiding role when the card block is inserted into the card interface, which facilitates the quick insertion of the card block into the card interface, and at the same time, the cover plays a certain protective role on the rotor core; the design of the circular hole and the through hole facilitates the installation of the shaft.

[0012] The present invention also provides a method for processing a motor rotor, comprising the following steps:

[0013] Step 1: a plurality of steel sheets are stacked vertically to form a rotor core;

[0014] Step 2, evenly apply sealing oil on the inner and outer circumferences of the rotor core;

[0015] Step 3, placing the rotor core in a mold, and integrating the plurality of retaining parts with the rotor core through an injection molding process;

[0016] Step 4: Press several magnetic steel blocks into the slots one by one, and move the rotating plate from the fixed plate to the magnetic steel block to press the magnetic steel block tightly;

[0017] Step 5: snap the cover into the card interface on the lower end surface of the retainer.

[0018] In step two, sealing oil is evenly applied on the inner and outer edges of the rotor core, which can effectively prevent dust from entering the gap between the steel sheets, thereby increasing the service life; in step three, the manufacturing process of the rotor core and the retaining parts is greatly shortened through the injection molding process.

[0019] The beneficial effects of the present invention are: it is conducive to the dissipation of heat from the upper and lower ends of the rotor core. At the same time, when the magnetic steel block is press-fitted, the retaining member is prone to generate powder, which is conducive to the powder falling from the end of the rotor core, avoiding the accumulation of powder causing poor heat dissipation and improving the service life; enhancing the strength between the rotor core and the retaining member, and effectively preventing the separation of the rotor core and the retaining member; the design is reasonable and easy to operate; through the injection molding process, the manufacturing process of the rotor core and the retaining member is greatly shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the connection structure between the sealing cover and the rotating sheet of the present invention;

[0022] Figure 3 is a schematic diagram of the connection structure between the rotor core and the retaining member;

[0023] Figure 4 is a schematic diagram of the connection structure of the support sheet;

[0024] Figure 5 yes Figure 3 Bottom view of

[0025] Figure 6 is an exploded view of the present invention;

[0026] Figure 7 yes Figure 6 A magnified view of the structure at center.

[0027] In the figure: 1. rotor core, 2. magnetic steel block, 3. cover, 4. retainer, 5. rotating plate, 6. steel plate, 7. connecting column, 8. fixing plate, 9. supporting plate, 10. covering plate, 11. slot, 12. card interface, 13. buckle, 14. column, 15. groove, 16. card block, 17. spring, 18. transition slope. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] like Figure 1 and Figure 2 In the described embodiment, a motor rotor includes a rotor core 1, a plurality of magnetic steel blocks 2 and a cover 3. The rotor core 1 is annular in shape, and a plurality of retaining members 4 are evenly distributed circumferentially on the outer ring of the rotor core 1. The plurality of retaining members 4 and the rotor core 1 are formed as a whole by injection molding. The magnetic steel block 2 is installed between two adjacent retaining members 4. The upper end of the retaining member 4 is connected to the end of the rotor core 1, and the cover 3 is detachably connected to the lower end of the retaining member 4.

[0030] like Figure 1 ,like Figure 3 and Figure 4 As shown, the rotor core 1 is formed by vertically stacking a plurality of steel sheets 6 . The shape of the steel sheet 6 is a regular polygon, and a through hole is provided at the center of the steel sheet 6 .

[0031] like Figure 1 and Figure 3 As shown, the retainer 4 is composed of a connecting column 7 and a fixing plate 8. The fixing plate 8 is located on the inner side of the upper end of the connecting column 7. The connecting column 7 is connected to the steel plate 6 on the top surface of the rotor core 1 through the fixing plate 8. A rotating plate 5 is provided on the fixing plate. The fixing plate 8 is rotatably connected to the rotating plate 5. Figure 4 As shown, a support sheet 9 is provided at the lower end of the connecting column 7, and the connecting column 7 is connected to the steel sheet 6 at the bottom surface of the rotor core 1 through the support sheet 9. The connecting column 7, the fixing sheet 8 and the support sheet 9 are all formed as one piece with the rotor core 1 by injection molding.

[0032] like Figure 4 and Figure 5 As shown, the width of the supporting sheet 9 is greater than the width of the connecting column 7 .

[0033] like Figure 1 , Figure 3 and Figure 4 As shown, the corners of one steel sheet 6 correspond to the corners of the other steel sheets 6 one by one, and form a straight edge in the vertical direction. The inner side of the connecting column 7 is connected to the straight edge, and the outer side of the connecting column 7 is provided with a covering plate 10. The width of the covering plate 10 is greater than the width of the connecting column 7. Figure 4 As shown, the cladding plate 10, the support sheet 9 and the plurality of steel sheets 6 between each two adjacent connecting columns 7 form a slot 11, as shown in FIG. Figure 2 As shown, the magnetic steel block 2 matches the slot 11 and is installed in the slot 11 .

[0034] like Figure 6As shown, a card interface 12 is formed between two adjacent support sheets 9, and the cover 3 is provided with a plurality of buckles 13 matching the card interface 12, and the plurality of buckles 13 form a circle, as shown in FIG. Figure 7 As shown, the buckle 13 includes a cylinder 14, one end of which is fixedly connected to the cover 3, and the other end of the cylinder 14 is provided with a plurality of grooves 15, and the plurality of grooves 15 are evenly distributed along the circumference of the cylinder 14, and a snap-fit ​​block 16 and a spring 17 are provided in the groove 15, and the snap-fit ​​block 16 is connected to the bottom of the groove 15 through the spring 17, and the cover 3 is mounted on the lower end surface of the retaining member 4 through the snap-fit ​​block 16 on the cylinder 14 and the card interface 12, one side of the snap-fit ​​block 16 is close to the cover 3, and the other side of the snap-fit ​​block 16 is away from the cover 3, and a transition slope 18 is provided on the side of the snap-fit ​​block 16 away from the cover 3, and a circular hole corresponding to the position of the through hole is provided on the cover 3, and the diameter of the circular hole is the same as the diameter of the through hole.

[0035] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the present invention also provides a method for processing a motor rotor, which is characterized in that it includes the following steps:

[0036] Step 1: a plurality of steel sheets 6 are vertically stacked to form a rotor core 1;

[0037] Step 2: evenly apply sealing oil on the inner and outer circumferences of the rotor core 1;

[0038] Step 3: Place the rotor core 1 in the mold, and use an injection molding process to integrate the plurality of retaining members 4 and the support sheet 9 with the rotor core 1;

[0039] Step 4: Press-fit several magnetic steel blocks 2 into the slots 11 one by one, and rotate the rotating plate 5 from the fixed plate 8 to the magnetic steel block 2 to press the magnetic steel block 2;

[0040] Step five: snap the cover 3 into the snap interface 12 on the lower end surface of the retaining member 4 .

[0041] Working principle: Several steel sheets are stacked vertically to form the rotor core 1. Sealing oil is evenly applied to the inner and outer circumferences of the rotor core 1 to effectively prevent dust from entering the gaps between the steel sheets, thereby increasing the service life. The rotor core 1 is placed in a mold, and several retaining members 4 and support sheets 9 are formed into one piece with the rotor core 1 through injection molding. The injection molding process greatly shortens the manufacturing process of the rotor core 1 and the retaining members 4. At the same time, after the steel sheets are stacked, due to the gaps between the steel sheets, part of the resin that forms the connecting column 7 will flow during the injection molding process. The fixing plate 8 and the supporting plate 9 are inserted into the gap between the steel sheets, thereby improving the strength between the rotor core 1 and the retaining member 4, and the fixing plate 8 and the supporting plate 9 are conducive to enhancing the radial force of the connecting column 7, which can effectively prevent the separation of the rotor core 1 and the retaining member 4; then, a plurality of magnetic steel blocks 2 are pressed into the slots 11 one by one, and the rotating plate 5 is transferred from the fixing plate 8 to the magnetic steel block 2, and the magnetic steel block 2 is pressed, thereby improving the stability of the magnetic steel block 2 during the rotation of the rotor; finally, the cover 3 is inserted into the card interface 12 on the lower end surface of the retaining member 4, thereby enhancing the strength between the rotor core 1 and the retaining member 4.

Claims

1. A motor rotor, characterized in that: The invention comprises a rotor core (1), a plurality of magnetic steel blocks (2) and a cover (3), wherein the rotor core (1) is annular in shape, a plurality of retaining members (4) are evenly distributed in the circumferential direction of the outer ring of the rotor core (1), the plurality of retaining members (4) and the rotor core (1) are integrally formed by injection molding, the magnetic steel block (2) is installed between two adjacent retaining members (4), the upper end of the retaining member (4) is connected to the end of the rotor core (1), and the cover (3) is detachably connected to the lower end of the retaining member (4); the rotor core (1) is formed by vertically stacking a plurality of steel sheets (6), the shape of the steel sheets (6) being a regular polygon, A through hole is provided at the center of the steel sheet (6); the retaining member (4) is composed of a connecting column (7) and a fixing plate (8); the fixing plate (8) is located on the inner side of the upper end of the connecting column (7); the connecting column (7) is connected to the steel sheet (6) at the top surface of the rotor core (1) via the fixing plate (8); a rotating plate (5) is provided on the fixing plate; the fixing plate (8) is rotatably connected to the rotating plate (5); a supporting plate (9) is provided at the lower end of the connecting column (7); the connecting column (7) is connected to the steel sheet (6) at the bottom surface of the rotor core (1) via the supporting plate (9); the connecting column (7), the fixing plate (8) and the supporting plate (9) are connected to each other; The support sheets (9) are integrally formed with the rotor core (1) by injection molding; a card interface (12) is formed between two adjacent support sheets (9); a plurality of buckles (13) matching the card interface (12) are provided on the cover (3); the buckles (13) form a circle; the buckles (13) include a column (14); one end of the column (14) is fixedly connected to the cover (3); the other end of the column (14) is provided with a plurality of grooves (15); the plurality of grooves (15) are evenly distributed along the circumference of the column (14); a card block (16) and a spring (17) are provided in the groove (15). The clamping block (16) is connected to the bottom of the groove (15) through a spring (17); the cover (3) is mounted on the lower end surface of the retaining member (4) through the clamping block (16) on the column (14) and the clamping interface (12); one side of the clamping block (16) is close to the cover (3), and the other side of the clamping block (16) is away from the cover (3); a transition slope (18) is provided on the side of the clamping block (16) away from the cover (3); a circular hole corresponding to the position of the through hole is provided on the cover (3); the diameter of the circular hole is the same as the diameter of the through hole; the method for processing the motor rotor comprises the following steps: Step 1: a plurality of steel sheets (6) are vertically stacked to form a rotor core (1); Step 2: evenly apply sealing oil to the inner and outer circumferences of the rotor core (1); Step three, placing the rotor core (1) in a mold, and using an injection molding process to form a plurality of retaining pieces (4) and a support sheet (9) integrally with the rotor core (1); Step 4: Press-fit a plurality of magnetic steel blocks (2) into the slots (11) one by one, and rotate the rotating plate (5) from the fixed plate (8) to the magnetic steel block (2), and press the magnetic steel block (2); Step 5: snap the cover (3) into the snap interface (12) on the lower end surface of the retaining member (4).

2. A motor rotor according to claim 1, characterized in that: The width of the supporting sheet (9) is greater than the width of the connecting column (7).

3. A motor rotor according to claim 1 or 2, characterized in that: One of the The corners on the steel sheets (6) correspond to the corners on the other steel sheets (6) one by one, and form a straight edge in the vertical direction. The inner side of the connecting column (7) is connected to the straight edge. The outer side of the connecting column (7) is provided with a covering plate (10). The width of the covering plate (10) is greater than the width of the connecting column (7). The covering plate (10), the support sheet (9) and the plurality of steel sheets (6) between each two adjacent connecting columns (7) form a slot (11). The magnetic steel block (2) matches the slot (11) and is installed in the slot (11).

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