A high-precision motor rotor and machining method thereof

Abstract

The present invention provides a high-precision motor rotor and a processing method thereof, which solves the problem that the existing motor rotor is difficult to process and difficult to ensure high precision during the processing. The high-precision motor rotor of the present invention includes a rotor core and a magnet fixed to the outer periphery of the rotor core. A plurality of evenly distributed rectangular opening slots are axially opened inward on the outer periphery of the rotor core. A magnet is provided in each opening slot. The magnet includes an integrally formed rectangular body and a trapezoidal body. The rectangular body and the trapezoidal body constitute a magnet with a "convex" cross-section. In addition, the present invention also provides a processing method for a high-precision electronic rotor. The rotor core and the magnet of the motor rotor of the present invention are bonded with anaerobic adhesive and fixed with potting adhesive, which can ensure the firmness between the rotor core and the magnet, thereby improving the strength of the motor rotor. In addition, the outer diameter of the rotor is ground after the rotor core and the magnet are fixed as a whole, which can ensure that the magnet is intact and undamaged during the grinding process.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor assembly, and in particular provides a high-precision motor rotor and a processing method thereof. Background Art

[0002] The final size of existing motor rotors is mostly guaranteed by the assembly of the rotor core and magnets. The dimensional accuracy of the rotor core and magnets is required to be extremely high, and the processing is relatively difficult. Magnets are fragile parts, and it is difficult to ensure high precision during the processing. The accuracy of the final size of the assembled rotor is not enough to meet the needs of high-precision motors such as servo motors. Summary of the Invention

[0003] In order to solve the above technical problems, an object of the present invention is to provide a high-precision motor rotor and a processing method thereof.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: a high-precision motor rotor, which includes a rotor core and a magnet fixed to the outer circumference of the rotor core, wherein a plurality of evenly distributed rectangular open slots are axially opened inwardly on the outer circumference of the rotor core, and a magnet is provided in each open slot, and the N poles and S poles of all the magnets are alternately distributed. The magnet includes an integrally formed rectangular body and a trapezoidal body, and the rectangular body and the trapezoidal body constitute a magnet whole with a "convex"-shaped cross-section, and the rectangular body is placed in the open slot of the rotor core, and the first top surface, first left side surface and first right side surface of the rectangular body respectively match and fit with the first bottom surface, second left side surface and second right side surface of the open slot, and the first top surface of the rectangular body is fixed to the first bottom surface of the open slot by anaerobic adhesive, and the trapezoidal body of the magnet is exposed outside the rotor core, and the gap between two adjacent trapezoidal bodies is potted with potting glue to fix the rotor core and the magnet to form a whole.

[0005] Furthermore, the third left side surface and the third right side surface of the trapezoidal body are respectively inclined surfaces inclined from the shorter second top surface of the trapezoidal body to the longer second bottom surface, and the two inclined surfaces are symmetrical along the radial direction.

[0006] Furthermore, the second top surfaces of the trapezoidal body located on both sides of the rectangular body respectively abut against the circumferential surfaces of the outer periphery of the rotor core on both sides of the rotor core opening slot, and are arc surface structures that match and fit the circumferential surfaces.

[0007] Furthermore, the second bottom surface of the trapezoidal body is a curved surface structure, the outer peripheral surface of the potting compound is also a curved surface structure, and the curved surface of the trapezoidal body and the curved surface of the potting compound are connected to form a circular surface.

[0008] Furthermore, the number of the open slots is 32.

[0009] The present invention further provides a method for processing the high-precision motor rotor, which is specifically achieved by the following steps:

[0010] (1) Take the rotor core and machine 32 rectangular opening slots evenly along the axial direction on the outer peripheral surface of the rotor core;

[0011] (1)(2) Take 32 magnets and place them in the open slots in an alternating distribution of N poles and S poles. The magnets include an integrally formed rectangular body and a trapezoidal body. The rectangular body and the trapezoidal body constitute a magnet with a "convex" cross-section. The rectangular body is placed in the open slot of the rotor core. The first top surface, the first left side surface and the first right side surface of the rectangular body are matched and fitted with the first bottom surface, the second left side surface and the second right side surface of the open slot respectively. The first top surface of the rectangular body is fixed to the first bottom surface of the open slot by anaerobic adhesive.

[0012] (3) After the rectangular magnetic body is bonded and fixed to the rotor core, a potting tool is used to pot the gap between the two adjacent trapezoidal bodies exposed on the magnetic steel with potting glue. The outer peripheral surface of the potting glue is also an arc surface structure. The arc surface of the trapezoidal body and the arc surface of the potting glue are connected to form a circular surface. After potting is completed, the potting glue is accelerated to dry at high temperature. The potting glue can ensure the bonding strength between the rotor core and the magnetic steel, and fix the rotor core and the magnetic steel to form a whole.

[0013] (4) The outer peripheral surface of the rotor after potting and fixing in step (3) is ground using a high-precision grinder to ensure that the outer diameter of the rotor reaches the final size requirement.

[0014] Furthermore, the drying temperature in step (3) is 70-80°C.

[0015] Compared with the prior art, the present invention has the following beneficial effects: the rotor core and the magnet of the motor rotor of the present invention are fixed by anaerobic adhesive bonding and potting glue encapsulation, which can ensure the firmness between the rotor core and the magnet, thereby improving the strength of the motor rotor.

[0016] The gaps between the magnets are sealed with potting glue to form the N-pole magnets, S-pole magnets and rotor core into a whole, so that the rotor is evenly stressed during grinding and the sharp edges of the magnets are prevented from being stressed during grinding, ensuring that the magnets are intact and undamaged during the grinding process. The outer diameter of the rotor is ground after the rotor core and magnets are fixed as one, ensuring that the magnets are intact and undamaged during the grinding process. The outer diameter grinding method of the motor rotor can ensure the accuracy of the final size of the motor rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the motor rotor structure of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the rotor core of the present invention;

[0019] Figure 3 for Figure 2 Right view;

[0020] Figure 4 Schematic diagram of the structure of magnetic steel;

[0021] Figure 5 Schematic diagram of the motor rotor grinding process of the present invention;

[0022] In the figure: 1-rotor core; 1-1-open slot; 1-1-1-first bottom surface; 1-1-2-second left side surface; 1-1-3-second right side surface; 2-magnetic steel; 2-1-rectangular body; 2-1-1-first top surface; 2-1-2-first left side surface; 2-1-3-first right side surface; 2-2-trapezoidal body; 2-2-1-third left side surface; 2-2-2-third right side surface; 2-2-3-second bottom surface; 2-2-4-second top surface; 3-potting glue. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0024] Reference Figure 1-Figure 3 A high-precision motor rotor comprises a rotor core 1 and a magnetic steel 2 fixed to the outer periphery of the rotor core 1. A plurality of evenly distributed rectangular opening slots 1-1 are axially opened inwardly on the outer periphery of the rotor core 1. A magnetic steel 2 is arranged in each opening slot 1-1. The N poles and S poles of all the magnetic steels 2 are alternately distributed. Figure 4 The magnetic steel 2 includes an integrally formed rectangular body 2-1 and a trapezoidal body 2-2, and the rectangular body 2-1 and the trapezoidal body 2-2 constitute a magnetic steel 2 as a whole with a "convex" cross-section, and the rectangular body 2-1 is placed in the open slot 1-1 of the rotor core 1, and the first top surface 2-1-1, the first left side 2-1-2 and the first right side 2-1-3 of the rectangular body 2-1 are matched and fitted with the first bottom surface 1-1-1, the second left side 1-1-2 and the second right side 1-1-3 of the open slot 1-1 respectively, and the first top surface 2-1-1 of the rectangular body 2-1 is fixed to the first bottom surface 1-1-1 of the open slot 1-1 by anaerobic adhesive. The trapezoidal body 2-2 of the magnetic steel 2 is exposed outside the rotor core 1, and the gap between the two adjacent trapezoidal bodies 2-2 is sealed with a potting glue 3 to fix the rotor core 1 and the magnetic steel 2 to form a whole.

[0025] The third left side surface 2-2-1 and the third right side surface 2-2-2 of the trapezoidal body 2-2 are respectively inclined surfaces inclined from the shorter second top surface 2-2-4 of the trapezoidal body to the longer second bottom surface 2-2-3, and the two inclined surfaces are symmetrical along the radial direction.

[0026] The second top surfaces 2-2-4 of the trapezoidal body 2-2 located on both sides of the rectangular body 2-1 respectively abut against the circumferential surface of the outer periphery of the rotor core 1 on both sides of the opening slot 1-1 of the rotor core 1, and are arc surface structures matching and fitting the circumferential surface.

[0027] The second bottom surface 2-2-3 of the trapezoidal body 2-2 is a curved surface structure, and the outer peripheral surface of the potting compound 3 is also a curved surface structure. The curved surface of the trapezoidal body 2-2 and the curved surface of the potting compound 3 are connected to form a circular surface.

[0028] The number of the open slots 1 - 1 is 32.

[0029] The present invention further provides a method for processing the high-precision motor rotor, which is specifically achieved by the following steps:

[0030] (2) Take the rotor core 1 and machine 32 rectangular opening slots 1-1 evenly along the axial direction on the outer peripheral surface of the rotor core 1;

[0031] (3) Take 32 magnets 2 and place them in the open slot 1-1 with alternating N poles and S poles. The magnet 2 includes an integrally formed rectangular body 2-1 and a trapezoidal body 2-2. The rectangular body 2-1 and the trapezoidal body 2-2 constitute a magnet 2 with a "convex" cross-section. The rectangular body 2-1 is placed in the open slot 1-1 of the rotor core 1. The first top surface 2-1-1, the first left side 2-1-2 and the first right side 2-1-3 of the rectangular body 2-1 are matched and fitted with the first bottom surface 1-1-1, the second left side 1-1-2 and the second right side 1-1-3 of the open slot 1-1 respectively. The first top surface 2-1-1 of the rectangular body 2-1 is fixed to the first bottom surface 1-1-1 of the open slot 1-1 by anaerobic adhesive.

[0032] (3) After the rectangular body 2-1 of the magnetic steel 2 is bonded and fixed to the rotor core 1, a potting tool is used to pot the gap between the two adjacent trapezoidal bodies 2-2 exposed on the magnetic steel 2 with potting glue 3. After potting is completed, the potting glue is accelerated to dry at high temperature. The outer peripheral surface of the potting glue 3 is also a curved surface structure. The curved surface of the trapezoidal body 2-2 and the curved surface of the potting glue 3 are connected to form a circular surface. The potting glue 3 can ensure the bonding strength between the rotor core 1 and the magnetic steel 2, and fix the rotor core 1 and the magnetic steel 2 to form a whole;

[0033] In the initial design, the potting compound 3 covers the outer surface of all the magnets 2 to form a circular surface during potting. However, this is not easy to operate during potting and grinding. Therefore, the potting compound 3 is used to pot the gap between two adjacent trapezoidal bodies 2-2. The outer surface of the potting compound 3 is also an arc surface structure. The arc surface of the trapezoidal body 2-2 and the arc surface of the potting compound 3 are connected to form a circular surface.

[0034] (4)Reference Figure 5 The outer peripheral surface of the rotor after potting and fixing in step (3) is ground with a high-precision grinder so that the outer diameter of the rotor reaches the final size requirement.

[0035] The drying temperature in step (3) is 70-80°C.

[0036] The gaps between the magnets are sealed with potting glue to form the N-pole magnets, S-pole magnets and the rotor core into a whole, so that the rotor is evenly stressed during grinding and the sharp edges of the magnets are prevented from being stressed during grinding, ensuring that the magnets are intact and undamaged during the grinding process. Furthermore, the outer diameter of the rotor is ground after the rotor core and the magnets are fixed as one, ensuring that the magnets are intact and undamaged during the grinding process. The method of grinding the outer diameter of the motor rotor can ensure the accuracy of the final size of the motor rotor.

[0037] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A high-precision motor rotor, characterized in that: The motor rotor includes a rotor core and a magnet fixed to the outer periphery of the rotor core. A plurality of evenly distributed rectangular open slots are axially opened inwardly on the outer periphery of the rotor core. A magnet is arranged in each open slot, and the N poles and S poles of all the magnets are alternately distributed. The magnet includes an integrally formed rectangular body and a trapezoidal body. The rectangular body and the trapezoidal body constitute a magnet body with a "convex" cross-section. The rectangular body is placed in the open slot of the rotor core. The first top surface, the first left side surface, and the first right side surface of the rectangular body are matched and fitted with the first bottom surface, the second left side surface, and the second right side surface of the open slot respectively. The first top surface of the rectangular body is fixed to the first bottom surface of the open slot by anaerobic adhesive. The trapezoidal body of the magnet is exposed outside the rotor core. The gap between two adjacent trapezoidal bodies is potted with potting adhesive to fix the rotor core and the magnet to form a whole. The second bottom surface of the trapezoidal body is a curved surface structure, the outer peripheral surface of the potting compound is also a curved surface structure, and the curved surface of the trapezoidal body and the curved surface of the potting compound are connected to form a circular surface; The third left side and the third right side of the trapezoidal body are respectively inclined surfaces inclined from the shorter second top surface of the trapezoidal body to the longer second bottom surface, and the two inclined surfaces are symmetrical along the radial direction.

2. A high-precision motor rotor according to claim 1, characterized in that: The second top surfaces of the trapezoidal body located on both sides of the rectangular body respectively abut against the circumferential surfaces of the outer periphery of the rotor core on both sides of the rotor core opening slot, and are arc surface structures that match and fit the circumferential surfaces.

3. A high-precision motor rotor according to claim 1, characterized in that: The number of the open slots is 32.

4. The method for processing a high-precision motor rotor according to claim 1, 2 or 3, characterized in that: This is achieved through the following steps: (1) Take the rotor core and machine 32 rectangular opening slots evenly along the axial direction on the outer peripheral surface of the rotor core; (2) Take 32 magnets and place them in the open slots in an alternating pattern of N and S poles. The magnets include an integrally formed rectangular body and a trapezoidal body. The rectangular body and the trapezoidal body form a magnet with a "convex" cross-section. The rectangular body is placed in the open slots of the rotor core. The first top surface, first left side surface, and first right side surface of the rectangular body are respectively matched with the first bottom surface, second left side surface, and second right side surface of the open slot. The first top surface of the rectangular body is fixed to the first bottom surface of the open slot by anaerobic adhesive. (3) After the rectangular magnetic body is bonded and fixed to the rotor core, a potting tool is used to pot the gap between the two adjacent trapezoidal bodies exposed on the magnetic steel with potting glue. The outer peripheral surface of the potting glue is also an arc surface structure. The arc surface of the trapezoidal body and the arc surface of the potting glue are connected to form a circular surface. After potting is completed, the potting glue is accelerated to dry at high temperature. The potting glue can ensure the bonding strength between the rotor core and the magnetic steel, and fix the rotor core and the magnetic steel to form a whole. (4) The outer peripheral surface of the rotor after potting and fixing in step (3) is ground using a high-precision grinder to ensure that the outer diameter of the rotor reaches the final size requirement.

5. The method for processing a high-precision motor rotor according to claim 4, wherein: The drying temperature in step (3) is 70-80°C.

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