阅读说明：本技术 一种低转矩波动直驱永磁同步电机 (Low-torque fluctuation direct-drive permanent magnet synchronous motor ) 是由 穆润兴 赵灿灿 李新 过志强 于 2019-12-10 设计创作，主要内容包括：本发明公开的一种低转矩波动直驱永磁同步电机，涉及电机设备技术领域，包括相互匹配的定子和转子，所述定子，包括定子铁芯组件和线轴组件；所述定子铁芯组件包括带有中空内腔的定子铁芯本体，和沿所述中空内腔圆周排列的齿部，每相邻所述齿部之间形成直口槽；所述线轴组件包括可与所述齿部套设的骨架，所述骨架上缠绕有绕线；所述转子，包括带有圆柱形中空腔体的圆柱形转子铁芯，沿所述转子铁芯的外壁按圆周方向设置有若干与所述转子铁芯等长度的燕尾槽，沿所述燕尾槽的轴心位置开设有半圆孔槽；每相邻所述燕尾槽之间设置带有偏辐的磁瓦。本发明强度高，安装方便，尺寸的优化设计使得转矩脉动和齿槽转矩均低于额定转矩的1%。(The invention discloses a low-torque-fluctuation direct-drive permanent magnet synchronous motor, which relates to the technical field of motor equipment and comprises a stator and a rotor which are matched with each other, wherein the stator comprises a stator iron core component and a bobbin component; the stator core assembly comprises a stator core body with a hollow inner cavity and tooth parts arranged along the circumference of the hollow inner cavity, and a straight slot is formed between every two adjacent tooth parts; the bobbin assembly comprises a framework which can be sleeved with the tooth part, and a winding is wound on the framework; the rotor comprises a cylindrical rotor core with a cylindrical hollow cavity, a plurality of dovetail grooves with the same length as the rotor core are arranged along the outer wall of the rotor core in the circumferential direction, and a semicircular hole groove is formed in the axis position of each dovetail groove; and a magnetic shoe with offset is arranged between every two adjacent dovetail grooves. The invention has high strength, convenient installation and optimized size design, so that the torque ripple and the cogging torque are both lower than 1 percent of the rated torque.)

1. The utility model provides a low torque fluctuation directly drives PMSM, includes stator and the rotor that matches each other, its characterized in that:

the stator comprises a stator core assembly and a bobbin assembly; the stator core assembly comprises a stator core body with a hollow inner cavity and tooth parts arranged along the circumference of the hollow inner cavity, and a straight slot is formed between every two adjacent tooth parts; the bobbin assembly comprises a framework which can be sleeved with the tooth part, and a winding is wound on the framework;

the rotor comprises a cylindrical rotor core with a cylindrical hollow cavity, a plurality of dovetail grooves with the same length as the rotor core are arranged along the outer wall of the rotor core in the circumferential direction, and a semicircular hole groove is formed in the axis position of each dovetail groove; and a magnetic shoe with offset is arranged between every two adjacent dovetail grooves.

2. The low-torque-ripple direct-drive permanent magnet synchronous motor according to claim 1, characterized in that: the bottom edge of the straight opening groove is in a V shape and comprises a first bottom edge and a second bottom edge which are connected with each other, and the first bottom edge and the second bottom edge are respectively perpendicular to the adjacent tooth parts.

3. The low-torque-ripple direct-drive permanent magnet synchronous motor according to claim 2, characterized in that: the tooth portion is cuboid or cube, the tooth portion has 24, with stator core body integrated into one piece casting shaping.

4. The low-torque-ripple direct-drive permanent magnet synchronous motor according to claim 1, characterized in that: the framework comprises a framework body, a first baffle and a second baffle which are positioned at two ends of the framework body and are parallel to each other, a group of square holes are respectively formed along two ends of the first baffle, the winding wire is positioned between the first baffle and the second baffle, the wire end and the wire tail of the winding wire are led out through the square holes, and the wire outlet ends are connected in a three-phase star-shaped connection mode; the first baffle plate is in contact with the stator core body.

5. The low-torque-ripple direct-drive permanent magnet synchronous motor according to claim 4, wherein: the thickness of the framework is 0.7 mm; the wire diameter of the winding wire is 0.95mm, and the number of winding turns is 60.

6. The low-torque-ripple direct-drive permanent magnet synchronous motor according to claim 1, characterized in that: the stator core body is cylindrical, the outer diameter is 210mm, and the inner diameter is 158 mm; the tooth part is 19mm in height and 12mm in width.

7. The low-torque-ripple direct-drive permanent magnet synchronous motor according to claim 1, characterized in that: the stator core assembly and the bobbin assembly are encapsulated in plastic.

8. The low-torque-ripple direct-drive permanent magnet synchronous motor according to claim 1, characterized in that: the magnetic shoe is 80mm long and 5mm thick and comprises an outer arc surface and a bottom arc surface, wherein the circle center of the bottom arc surface is (0, 0), the radian is 15.2 degrees, and the radius is 73 mm; the radius of the outer arc surface is 27mm, and the radius of the circle center is 50 mm.

9. The low-torque-ripple direct-drive permanent magnet synchronous motor according to claim 5, wherein: the magnetic shoe has 20 pieces, and the material is neodymium iron boron N42 SH.

10. The low-torque-ripple direct-drive permanent magnet synchronous motor according to claim 1, characterized in that: the outer diameter of the rotor core is 156mm, and the inner diameter of the rotor core is 110 mm; correspondingly, the radian of the dovetail groove is 2.8 degrees, and the radius of the semicircular hole groove is 0.92 mm.

Technical Field

The invention relates to the technical field of motor equipment, in particular to a low-torque-fluctuation direct-drive permanent magnet synchronous motor.

Background

In the transmission mechanism of the common motor, a motor rotor is connected with a load through a motor shaft and a series of mechanical transmission mechanisms such as a coupler, a screw rod, a synchronous belt, a rack, a speed reducer and the like, and in the process, the possibility of existence of factors such as gaps, elastic deformation, friction damping and the like is increased from the mechanical perspective, so that the reduction and loss of the rigidity and the response characteristic of the equipment are caused.

The direct drive motor does not need other transmission devices, and is directly connected with equipment, such as a drum of a washing machine, and the motor, so that the connecting parts of a mechanical transmission part are reduced, and the loss can be avoided and reduced.

In the traditional indirect drive, the intermediate link has the functions of buffering, damping and torque increasing, and the direct drive motor system is easily influenced by factors such as load torque fluctuation, parameter change, nonlinearity, disturbance and the like due to the loss of the intermediate link, so that the torque size and the torque fluctuation of the direct drive motor are important factors for stable operation of the direct drive system.

The application occasions of the direct drive motor require high torque density and power density, the neodymium iron boron permanent magnet synchronous motor can be adopted, and reduction of torque pulsation of the permanent magnet synchronous motor is always an important research subject, for example, a stator chute scheme is adopted, so that torque pulsation can be effectively reduced, but the torque can be weakened, and the process difficulty can be improved. Therefore, a new stator improvement solution is urgently needed to solve the above problems.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provides a low-torque-fluctuation direct-drive permanent magnet synchronous motor, which not only maintains the integrity of a stator, but also improves the slot filling rate of the motor, and can effectively ensure the strength of the motor under the torque working condition and reduce vibration by a method of mounting the single framework winding on the teeth of the stator of the integral motor. And is convenient in installation and maintenance.

The above purpose is realized by the following technical scheme:

a low-torque-fluctuation direct-drive permanent magnet synchronous motor comprises a stator and a rotor which are matched with each other, wherein the stator comprises a stator core assembly and a bobbin assembly; the stator core assembly comprises a stator core body with a hollow inner cavity and tooth parts arranged along the circumference of the hollow inner cavity, and a straight slot is formed between every two adjacent tooth parts; the bobbin assembly comprises a framework which can be sleeved with the tooth part, and a winding is wound on the framework; the rotor comprises a cylindrical rotor core with a cylindrical hollow cavity, a plurality of dovetail grooves with the same length as the rotor core are arranged along the outer wall of the rotor core in the circumferential direction, and a semicircular hole groove is formed in the axis position of each dovetail groove; and a magnetic shoe with offset is arranged between every two adjacent dovetail grooves.

Preferably, the bottom edge of the straight-mouth groove is in a V shape and comprises a first bottom edge and a second bottom edge which are connected with each other, and the first bottom edge and the second bottom edge are respectively perpendicular to the adjacent tooth parts.

Preferably, the tooth part is cuboid or cube, there are 24 tooth parts, with stator core body integrated casting shaping.

Preferably, the framework comprises a framework body, a first baffle and a second baffle which are positioned at two ends of the framework body and are parallel to each other, a group of square holes are respectively formed along two ends of the first baffle, the winding wire is positioned between the first baffle and the second baffle, the wire end and the wire tail of the winding wire are led out through the square holes, and the wire outlet ends are connected in a three-phase star-shaped connection mode; the first baffle plate is in contact with the stator core body.

Preferably, the thickness of the framework is 0.7 mm; the wire diameter of the winding wire is 0.95mm, and the number of winding turns is 60 turns

Preferably, the stator core body is cylindrical, the outer diameter is 210mm, and the inner diameter is 158 mm; the tooth part is 19mm in height and 12mm in width.

Preferably, the stator core assembly and the bobbin assembly are encapsulated in plastic.

Preferably, the magnetic shoe is 80mm long and 5mm thick, and comprises an outer arc surface and a bottom arc surface, wherein the circle center of the bottom arc surface is (0, 0), the radian is 15.2 degrees, and the radius is 73 mm; the radius of the outer arc surface is 27mm, and the radius of the circle center is 50 mm.

Preferably, the magnetic shoe has 20 pieces, and the material is neodymium iron boron N42 SH.

Preferably, the outer diameter of the rotor core is 156mm, and the inner diameter of the rotor core is 110 mm; correspondingly, the radian of the dovetail groove is 2.8 degrees, and the radius of the semicircular hole groove is 0.92 mm.

Advantageous effects

The low-torque fluctuation direct-drive permanent magnet synchronous motor provided by the scheme has the following advantages:

straight slot shapes are formed between adjacent tooth parts of the stator, the bottom of each tooth part is vertical to the corresponding tooth part, and the tooth parts are equal in width from top to bottom, so that the framework is convenient to mount and wind; the assembly is simple and efficient, the stator winding process is that firstly, the independent framework is wound, the winding is completed, and the framework with the winding is arranged on the stator tooth part; tooth portion and stator body adopt integrative design, have guaranteed the intensity of stator, adopt independent skeleton, and the direct wire winding of whole stator has improved the full rate of groove 15% compared to the independent wire winding of skeleton.

The rotor adopts magnetic shoe partial amplitude, reduces tooth's socket torque and torque pulsation, and the rotor surface adopts the dovetail form, restricts the magnetic shoe circumferencial direction drunkenness, has guaranteed the stability of motor under the torque working condition and has reduced the vibration, and the forked tail part has adopted middle trompil mode simultaneously, reduces the magnetic leakage between the rotor magnetic shoe, has effectively improved torque density.

The whole stator adopts 24 straight slots of the whole stator, which not only ensures the strength, but also adopts 24 independent frameworks, each framework is independently wound, the slot fullness rate is improved by 15 percent compared with the direct winding of the whole stator, and the wound frameworks are arranged on the stator teeth; and after the sizes of the stator tooth part and the rotor magnetic shoe are optimized and matched, the torque ripple and the cogging torque are lower than 1% of the rated torque.

Drawings

FIG. 1 is a schematic structural diagram of a low-torque-ripple direct-drive permanent magnet synchronous motor according to the invention;

FIG. 2 is a schematic view of the stator core assembly and the bobbin assembly of the low-torque-ripple direct-drive permanent magnet synchronous motor according to the present invention;

FIG. 3 is a schematic structural diagram of a bobbin assembly of a low-torque-ripple direct-drive permanent magnet synchronous motor according to the present invention;

FIG. 4 is a schematic structural diagram of a rotor of a low-torque-ripple direct-drive permanent magnet synchronous motor according to the invention;

fig. 5 is a schematic structural diagram of a magnetic shoe of the low-torque-fluctuation direct-drive permanent magnet synchronous motor.

Detailed Description

It should be noted that the description and sequence of descriptions of specific structures in this section are merely illustrative of specific embodiments and should not be construed as limiting the scope of the invention in any way. Furthermore, the embodiments in this section and the features in the embodiments may be combined with each other without conflict.

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, 2 and 4, the low-torque-fluctuation direct-drive permanent magnet synchronous motor comprises a stator 1 and a rotor 2 which are matched with each other, wherein the stator 1 comprises a stator core assembly 1-1 and a bobbin assembly 1-2; the stator core assembly 1-1 comprises a stator core body 1-111 with a hollow inner cavity and tooth parts 1-12 arranged along the circumference of the hollow inner cavity, and a straight slot 1-13 is formed between every two adjacent tooth parts 1-12; the bobbin assembly 1-2 comprises a framework 1-21 which can be sleeved with the tooth part 1-12, and a winding 1-22 is wound on the framework 1-21; the rotor 2 comprises a cylindrical rotor core 2-1 with a cylindrical hollow cavity, a plurality of dovetail grooves 2-2 with the same length as the rotor core 2-1 are arranged along the outer wall of the rotor core 2-1 in the circumferential direction, and semicircular hole grooves 2-3 are formed in the axis position of the dovetail grooves 2-2; and magnetic tiles 2-4 with offset are arranged between every two adjacent dovetail grooves 2-2.

Specifically, in this embodiment, as shown in fig. 2, the bottom sides of the straight slots 1 to 13 are V-shaped, and include a first bottom side 1 to 131 and a second bottom side 1 to 132 connected to each other, where the first bottom side 1 to 131 and the second bottom side 1 to 132 are perpendicular to the adjacent tooth portions 1 to 12, respectively; tooth portion 1-12 are cuboid or cube, have 24 and the mutual distance is the same, corresponding, straight mouthful groove 1-13 also has 24, has adopted 24 straight mouthful grooves of whole stator, has both guaranteed intensity, adopts 24 independent skeletons 1-21 simultaneously, and every skeleton 1-21 is alone wire winding, compares whole stator direct wire winding and has improved the full rate in groove 15%. The straight slot 1-13 and the stator core body 1-1 are integrally cast and molded. Two bottom edges (namely, the first bottom edge 1-131 and the second bottom edge 1-132) of the tooth part 1-12 adjacent to the bottom are vertically arranged, so that the bobbin assembly 1-2 can be better attached and fixed with the tooth part 1-12 and the stator core body 1-1, and the slot filling rate can be greatly improved.

As shown in fig. 3, the bobbin 1-21 includes a bobbin body 1-211, and a first baffle 1-212 and a second baffle 1-213 which are parallel to each other and located at two ends of the bobbin body 1-211, a set of square holes 1-214 are respectively formed along two ends of the first baffle 1-212, the winding wire 1-22 is located between the first baffle 1-212 and the second baffle 1-213, a wire end and a wire tail of the winding wire 1-22 are led out through the square holes 1-214, wire outlet ends are connected in a three-phase star connection manner, and a welding manner is adopted at a connection position; the first baffle plate 1-212 is in contact with the stator core body 1-11 (i.e. two of the bottoms of each adjacent straight slot 1-13 are located at the bottom of the same horizontal plane, and the bottom is perpendicular to the tooth part 1-12).

The thickness of the framework 1-21 is 0.7 mm;

the wire diameter of the winding wires 1-22 is 0.95mm, and the number of winding turns is 60.

The stator core bodies 1-11 are cylindrical, the outer diameter is 210mm, and the inner diameter is 158 mm;

the tooth part is 19mm in height and 12mm in width.

During installation, the stator core component and the bobbin component are packaged by plastics, so that the protection grade of the stator can be improved, and the overload operation capacity can be improved.

In this embodiment, as shown in fig. 4 and 5, the magnetic shoe 2-4 is 80mm long and 5mm thick, and includes an outer arc surface 2-41 and a bottom arc surface 2-42, the circle center of the bottom arc surface 2-42 is (0, 0), the radian is 15.2 °, and the radius is 73 mm; the radius of the outer arc surface 2-41 is 27mm, and the radius of the circle center is 50 mm.

The magnetic shoe 2-4 is provided with 20 pieces of neodymium iron boron N42 SH.

The outer diameter of the rotor iron core 2-1 is 156mm, and the inner diameter of the rotor iron core 2-1 is 110 mm; correspondingly, the radian of the dovetail groove 2-2 is 2.8 degrees, and the radius of the semicircular hole groove 2-3 is 0.92 mm.

This embodiment has adopted 24 straight mouthful grooves of whole stator, has both guaranteed intensity, adopts 24 independent skeletons simultaneously, and every skeleton is wire winding alone, compares the direct wire winding of whole stator and has improved the full rate in groove 15%, and the skeleton after the wire winding is installed on tooth portion for it is more convenient to install. And the magnetic shoes with 20 offset spokes are also adopted, and after the sizes of the tooth part of the stator and the rotor magnetic shoes are optimized to be matched, the torque ripple and the cogging torque are both lower than 1% of the rated torque.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be made by one skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.