阅读说明：本技术 一种高精度电机转子及其加工方法 (High-precision motor rotor and machining method thereof ) 是由 田玉顺 杨成玉 杨德才 于收海 于 2019-11-27 设计创作，主要内容包括：本发明提供一种高精度电机转子及其加工方法,解决了现有的电机转子加工困难且在加工过程中难以保证高精度的问题。本发明的高精度电机转子包括转子铁芯和固定在转子铁芯外周的磁钢,在所述转子铁芯外周面向内轴向开设有多个平均分布的矩形开口槽,在每个开口槽内设有磁钢,所述磁钢包括一体成型的矩形体和梯形体,矩形体和梯形体构成截面为“凸”字型的磁钢整体。另外,本发明还提供高精度电子转子的加工方法。本发明电机转子的转子铁芯和磁钢采用厌氧胶粘接和灌封胶灌封固定,可以保证转子铁芯与磁钢之间的牢固程度,进而提升电机转子的强度。并且采用在转子铁芯和磁钢固定为一体后的转子磨削加工外径,可以保证磁钢在磨加工过程中完好、无损伤。(The invention provides a high-precision motor rotor and a processing method thereof, and solves the problems that the existing motor rotor is difficult to process and the high precision is difficult to ensure in the processing process. The high-precision motor rotor comprises a rotor core and magnetic steel fixed on the periphery of the rotor core, wherein a plurality of rectangular open grooves which are uniformly distributed are formed in the outer peripheral surface of the rotor core in the inward axial direction, the magnetic steel is arranged in each open groove, the magnetic steel comprises a rectangular body and a trapezoidal body which are integrally formed, and the rectangular body and the trapezoidal body form a magnetic steel whole body with a convex section. In addition, the invention also provides a processing method of the high-precision electronic rotor. The rotor core and the magnetic steel of the motor rotor are bonded by the anaerobic adhesive and fixed by the potting adhesive, so that the firmness between the rotor core and the magnetic steel can be ensured, and the strength of the motor rotor is further improved. And adopt the rotor grinding external diameter after rotor core and magnet steel are fixed as an organic whole, can guarantee that the magnet steel is intact, not damaged in the grinding process.)

1. A high-precision motor rotor is characterized by comprising a rotor core and magnetic steel fixed on the periphery of the rotor core, wherein a plurality of uniformly distributed rectangular open grooves are axially formed in the outer peripheral surface of the rotor core inwards, the magnetic steel is arranged in each open groove, N poles and S poles of all the magnetic steel are alternately distributed, the magnetic steel comprises a rectangular body and a trapezoidal body which are integrally formed, the rectangular body and the trapezoidal body form a whole magnetic steel with a convex cross section, the rectangular body is arranged in the open grooves of the rotor core, a first top surface, a first left side surface and a first right side surface of the rectangular body are respectively matched and attached with a first bottom surface, a second left side surface and a second right side surface of each open groove, the first top surface of the rectangular body and the first bottom surface of each open groove are fixedly connected through anaerobic glue, the trapezoidal body of the magnetic steel is exposed outside the rotor core, a gap between every two adjacent trapezoidal bodies is filled and sealed by a sealing glue, the rotor core and the magnetic steel are fixed to form a whole.

2. A high-precision motor rotor as claimed in claim 1, wherein the third left side surface and the third right side surface of the trapezoidal body are inclined surfaces respectively inclined from the shorter second top surface to the longer second bottom surface of the trapezoidal body, and the two inclined surfaces are symmetrical in the radial direction.

3. A high-precision motor rotor as claimed in claim 1, wherein the second top surfaces of the trapezoidal bodies on both sides of the rectangular body respectively abut against the circumferential surfaces of the outer peripheries of the rotor cores on both sides of the open slot of the rotor core, and are of cambered surface structures matched with the circumferential surfaces.

4. A high-precision motor rotor as claimed in claim 1, wherein the second bottom surface of the trapezoid is of a cambered surface structure, the outer circumferential surface of the potting adhesive is of a cambered surface structure, and the cambered surface of the trapezoid and the cambered surface of the potting adhesive are connected to form a circumferential surface.

5. A high accuracy electric motor rotor as recited in claim 1, wherein said number of said open slots is 32.

6. The method for processing the high-precision motor rotor as recited in claim 1, 2, 3, 4 or 5, is characterized by comprising the following steps:

(1) taking a rotor core, and evenly processing 32 rectangular open slots on the peripheral surface of the rotor core along the axial direction;

(2) taking 32 pieces of magnetic steel, and alternately distributing the magnetic steel in the open slot according to the N pole and the S pole, wherein the magnetic steel comprises a rectangular body and a trapezoidal body which are integrally formed, the rectangular body and the trapezoidal body form a magnetic steel whole with a convex section, the rectangular body is arranged in the open slot of the rotor core, a first top surface, a first left side surface and a first right side surface of the rectangular body are respectively matched and attached with a first bottom surface, a second left side surface and a second right side surface of the open slot, and the first top surface of the rectangular body and the first bottom surface of the open slot are fixedly connected through anaerobic glue;

(3) after the rectangular magnetic steel body is bonded and fixed with the rotor iron core, a potting tool is used for potting a gap between two adjacent trapezoidal bodies exposed out of the magnetic steel with potting adhesive, the outer peripheral surface of the potting adhesive is also of a cambered surface structure, the cambered surface of each trapezoidal body is connected with the cambered surface of the potting adhesive to form a circumferential surface, the potting adhesive is dried at high temperature in an accelerated manner after potting is completed, the potting adhesive can ensure the bonding strength between the rotor iron core and the magnetic steel, and the rotor iron core and the magnetic steel are fixed to form a whole;

(4) and (4) grinding the peripheral surface of the rotor subjected to potting fixation in the step (3) by using a high-precision grinding machine, so that the outer diameter of the rotor meets the final size requirement.

7. The method for processing the high-precision motor rotor as claimed in claim 6, wherein the drying temperature in the step (3) is 70-80 ℃.

Technical Field

The invention belongs to the technical field of motor assembly, and particularly provides a high-precision motor rotor and a machining method thereof.

Background

The final size of the existing motor rotor is mostly guaranteed by the assembly of the rotor core and the magnetic steel, the size precision of the rotor core and the magnetic steel is very high, the processing is difficult, the magnetic steel is a fragile piece, the high precision is difficult to guarantee in the processing process, and the precision of the final size of the assembled rotor is not enough to meet the requirements of high-precision motors such as servo motors.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a high-precision motor rotor and a processing method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme: a high-precision motor rotor comprises a rotor core and magnetic steel fixed on the periphery of the rotor core, wherein a plurality of rectangular open grooves which are uniformly distributed are axially formed in the outer peripheral surface of the rotor core inwards, the magnetic steel is arranged in each open groove, and N poles and S poles of all the magnetic steel are alternately distributed, the magnetic steel comprises a rectangular body and a trapezoidal body which are integrally formed, the rectangular body and the trapezoidal body form a whole magnetic steel with a convex cross section, the rectangular body is arranged in the open grooves of the rotor core, a first top surface, a first left side surface and a first right side surface of the rectangular body are respectively matched and attached with a first bottom surface, a second left side surface and a second right side surface of each open groove, the first top surface of the rectangular body and the first bottom surface of each open groove are fixedly connected through anaerobic glue, the trapezoidal body of the magnetic steel is exposed outside the rotor core, pouring sealant is used for a gap between every two adjacent trapezoidal bodies, the rotor core and the magnetic steel are fixed to form a whole.

Furthermore, the third left side surface and the third right side surface of the trapezoid body are inclined surfaces which are inclined from the shorter second top surface to the longer second bottom surface of the trapezoid body, and the two inclined surfaces are symmetrical along the radial direction.

Furthermore, the second top surfaces of the trapezoidal bodies, which are positioned on the two sides of the rectangular body, respectively abut against the circumferential surfaces of the peripheries of the rotor cores on the two sides of the opening grooves of the rotor cores, and are of cambered surface structures matched and attached with the circumferential surfaces.

Furthermore, the second bottom surface of the trapezoid is of a cambered surface structure, the peripheral surface of the pouring sealant is of a cambered surface structure, and the cambered surface of the trapezoid is connected with the cambered surface of the pouring sealant to form a circumferential surface.

Further, the number of the open grooves is 32.

The invention also provides a processing method of the high-precision motor rotor, which is realized by the following steps:

(1) taking a rotor core, and evenly processing 32 rectangular open slots on the peripheral surface of the rotor core along the axial direction;

(1) (2) taking 32 pieces of magnetic steel, and alternately distributing the magnetic steel in the open slot according to the N pole and the S pole, wherein the magnetic steel comprises a cuboid and a trapezoidal body which are integrally formed, the cuboid and the trapezoidal body form a whole magnetic steel with a convex cross section, the cuboid is arranged in the open slot of the rotor core, a first top surface, a first left side surface and a first right side surface of the cuboid are respectively matched and attached with a first bottom surface, a second left side surface and a second right side surface of the open slot, and the first top surface of the cuboid and the first bottom surface of the open slot are fixedly connected through anaerobic glue;

(3) after the rectangular magnetic steel body is bonded and fixed with the rotor iron core, a potting tool is used for potting a gap between two adjacent trapezoidal bodies exposed out of the magnetic steel with potting adhesive, the outer peripheral surface of the potting adhesive is also of a cambered surface structure, the cambered surface of each trapezoidal body is connected with the cambered surface of the potting adhesive to form a circumferential surface, the potting adhesive is dried at high temperature in an accelerated manner after potting is completed, the potting adhesive can ensure the bonding strength between the rotor iron core and the magnetic steel, and the rotor iron core and the magnetic steel are fixed to form a whole;

(4) and (4) grinding the peripheral surface of the rotor subjected to potting fixation in the step (3) by using a high-precision grinding machine, so that the outer diameter of the rotor meets the final size requirement.

Further, the drying temperature in the step (3) is 70-80 ℃.

Compared with the prior art, the invention has the following beneficial effects: the rotor core and the magnetic steel of the motor rotor are bonded by the anaerobic adhesive and fixed by the potting adhesive, so that the firmness between the rotor core and the magnetic steel can be ensured, and the strength of the motor rotor is further improved.

The N-pole magnetic steel, the S-pole magnetic steel and the rotor core form a whole in the magnetic steel gap in a pouring sealant filling and sealing mode, so that the rotor is uniformly stressed during grinding, the sharp edge of the magnetic steel is prevented from being stressed during grinding, and the magnetic steel is ensured to be intact and not damaged during grinding; and adopt the rotor grinding external diameter after rotor core and magnet steel are fixed as an organic whole, can guarantee that the magnet steel is intact, not damaged in the grinding course of working, grind the machining mode of the external diameter of electric motor rotor and can guarantee the precision of the final size of electric motor rotor.

Drawings

FIG. 1 is a schematic view of a rotor of an electric machine according to the present invention;

FIG. 2 is a schematic structural view of a rotor core of the present invention;

FIG. 3 is a right side view of FIG. 2;

FIG. 4 is a schematic structural diagram of magnetic steel;

FIG. 5 is a schematic view of the grinding operation of the motor rotor of the present invention;

in the figure: 1-a rotor core; 1-1-open slot; 1-1-1-a first bottom surface; 1-1-2-second left side; 1-1-3-the second right side; 2-magnetic steel; 2-1-cuboid; 2-1-1-a first top surface; 2-1-2-first left side; 2-1-3-a first right side; 2-2-trapezoids; 2-2-1-third left side; 2-2-2-third right side; 2-2-3-a second bottom surface; 2-2-4-second top surface; 3-pouring sealant.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-3, a high-precision motor rotor comprises a rotor core 1 and a magnetic steel 2 fixed on the periphery of the rotor core 1, wherein a plurality of rectangular open slots 1-1 are axially formed in the outer peripheral surface of the rotor core 1, the magnetic steel 2 is arranged in each open slot 1-1, N poles and S poles of all the magnetic steels 2 are alternately distributed, referring to fig. 4, the magnetic steel 2 comprises a rectangular body 2-1 and a trapezoidal body 2-2 which are integrally formed, the rectangular body 2-1 and the trapezoidal body 2-2 form a magnetic steel 2 whole body with a convex cross section, the rectangular body 2-1 is arranged in the open slot 1-1 of the rotor core 1, and a first top surface 2-1-1, a first left side surface 2-1-2 and a first right side surface 2-1-3 of the rectangular body 2-1 are respectively connected with a first bottom surface 1-1 of the open slot 1-1 The rotor core 1 and the magnetic steel 2 are fixed into a whole by matching and attaching the first left side face 1-1-2 and the second right side face 1-1-3, the first top face 2-1-1 of the rectangular body 2-1 and the first bottom face 1-1-1 of the open slot 1-1 are fixedly connected through anaerobic glue, the trapezoidal bodies 2-2 of the magnetic steel 2 are exposed outside the rotor core 1, and a gap between every two adjacent trapezoidal bodies 2-2 is encapsulated through a potting adhesive 3.

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

The second top surfaces 2-2-4 of the trapezoidal bodies 2-2, which are positioned at the two sides of the rectangular body 2-1, respectively abut against the circumferential surfaces of the peripheries of the rotor iron cores 1 at the two sides of the opening grooves 1-1 of the rotor iron cores 1, and are of cambered surface structures matched and attached with the circumferential surfaces.

The second bottom surface 2-2-3 of the trapezoid body 2-2 is of an arc surface structure, the peripheral surface of the pouring sealant 3 is also of an arc surface structure, and the arc surface of the trapezoid body 2-2 is connected with the arc surface of the pouring sealant 3 to form a circumferential surface.

The number of the open grooves 1-1 is 32.

The invention also provides a processing method of the high-precision motor rotor, which is realized by the following steps:

(2) taking a rotor core 1, and evenly processing 32 rectangular open grooves 1-1 on the peripheral surface of the rotor core 1 along the axial direction;

(3) 32 magnetic steels 2 are taken, the magnetic steels 2 are alternately distributed in an open slot 1-1 according to N poles and S poles, the magnetic steels 2 comprise a cuboid 2-1 and a trapezoid 2-2 which are integrally formed, the cuboid 2-1 and the trapezoid 2-2 form a whole magnetic steel 2 with a convex cross section, the cuboid 2-1 is arranged in the open slot 1-1 of the rotor iron core 1, the first top surface 2-1-1, the first left side surface 2-1-2 and the first right side surface 2-1-3 of the cuboid 2-1 are matched and attached with the first bottom surface 1-1-1, the second left side surface 1-1-2 and the second right side surface 1-1-3 of the open slot 1-1 respectively, and the first top surface 2-1-1 of the cuboid 2-1 and the first bottom surface 1-1 of the open slot 1-1 1, fixing the components by anaerobic adhesive;

(3) after the rectangular bodies 2-1 of the magnetic steel 2 are bonded and fixed with the rotor iron core 1, potting adhesive 3 is used for potting gaps between two adjacent trapezoidal bodies 2-2 exposed out of the magnetic steel 2 by using potting tooling, the potting adhesive is dried at high temperature and accelerated after potting, the peripheral surface of the potting adhesive 3 is also of a cambered surface structure, the cambered surfaces of the trapezoidal bodies 2-2 and the cambered surface of the potting adhesive 3 are connected to form a circumferential surface, the potting adhesive 3 can ensure the bonding strength between the rotor iron core 1 and the magnetic steel 2, and the rotor iron core 1 and the magnetic steel 2 are fixed to form a whole;

in the initial design, the pouring sealant 3 covers the outer surfaces of all the magnetic steels 2 to form a circumferential surface during pouring, but the operation is not easy during pouring and grinding, so the pouring sealant 3 is used for pouring the gap between two adjacent trapezoidal bodies 2-2, the outer circumferential surface of the pouring sealant 3 is also in a cambered surface structure, and the cambered surface of the trapezoidal body 2-2 is connected with the cambered surface of the pouring sealant 3 to form the circumferential surface.

(4) Referring to fig. 5, the outer peripheral surface of the rotor after potting and fixing in step (3) is ground by a high-precision grinding machine so that the outer diameter of the rotor meets the final dimension requirement.

And (4) drying at the temperature of 70-80 ℃.

The N-pole magnetic steel, the S-pole magnetic steel and the rotor core form a whole in the magnetic steel gap in a pouring sealant filling and sealing mode, so that the rotor is uniformly stressed during grinding, the sharp edge of the magnetic steel is prevented from being stressed during grinding, and the magnetic steel is ensured to be intact and not damaged during grinding; and adopt the rotor abrasive machining external diameter after rotor core and magnet steel are fixed as an organic whole, can guarantee that the magnet steel is intact, not damaged in grinding the course of working, the processing mode of grinding motor rotor external diameter can guarantee the precision of motor rotor final dimension.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.