Annular direct drive motor

Abstract

The invention belongs to the technical field of motors, and particularly relates to an annular direct-drive motor, which comprises an annular stator, the annular stator comprises a stator iron core, the inner ring surface of the stator iron core is provided with a tooth groove, and a stator winding is arranged in the tooth groove; the annular rotor comprises a rotor iron core, and magnetic steel is arranged on the outer ring surface of the rotor iron core; the bearing comprises an outer ring, an inner ring and a roller arranged between the outer ring and the inner ring; the stator core is formed by stacking a plurality of layers of stator punching sheets, and each layer of stator punching sheet is formed by splicing a plurality of fan-shaped punching sheets which are arranged along the circumferential direction. Due to the fact that the annular design is adopted, the overall structure of the motor is more compact, the motor can be better integrated into CT equipment through the design of the annular stator and the annular rotor, the occupied space is reduced, and materials can be more efficiently utilized through the split type fan-shaped punching sheets.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a ring-shaped direct-drive motor. Background Art

[0002] When a CT (computed tomography) machine is operating, it uses high-speed rotation to scan, presenting various "lesions" in the patient's body to doctors in the form of images, providing direct reference for the prognosis and diagnosis of various diseases. Currently, the rotational drive of CT machines generally uses a traditional belt drive method. The scanning module is mounted on a flange, and a motor is installed next to the flange. The motor drives the flange through a pulley. However, due to the complex transmission system and the combined effects of various participating components, this drive method results in high noise levels and vibration during operation, reduced rotational scanning accuracy, and power transmission loss. These problems urgently need to be addressed by engineering personnel. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a ring-shaped direct-drive motor that can simplify the transmission path, reduce vibration and noise, and improve driving accuracy.

[0004] To achieve the above-mentioned and other related objectives, the present invention provides a ring-shaped direct-drive motor, comprising: An annular stator, the annular stator comprising a stator core, the inner annular surface of the stator core being provided with slots, and the stator windings being provided in the slots; An annular rotor, comprising a rotor core, wherein an outer ring surface of the rotor core is provided with magnetic steel; A bearing, the bearing comprising an outer ring, an inner ring, and a roller disposed between the outer ring and the inner ring, the outer ring being fixedly connected to the stator core, the inner ring being fixedly connected to the rotor core, and the inner ring constituting a power output end of the annular direct-drive motor; The stator core is formed by stacking multiple layers of stator punching sheets, and each layer of the stator punching sheets is formed by splicing multiple fan-shaped punching sheets arranged along the circumferential direction.

[0005] In an optional embodiment of the present invention, the inner diameter of the stator core is greater than or equal to 80 cm, the ratio of the inner diameter to the outer diameter of the stator core is k, and k satisfies: 0.8≤k<1.

[0006] In an optional embodiment of the present invention, each of the sector-shaped punching sheets is provided with n tooth slots, n is an even number, the angle between the center lines of adjacent tooth slots is α, the arc center angle corresponding to a single sector-shaped punching sheet is β, wherein β=n*α; the sector-shaped punching sheets of two adjacent layers of the stator punching sheets are staggered along the circumferential direction at a preset angle, and the preset angle is β / 2.

[0007] In an optional embodiment of the present invention, a first notch is provided at the center of the outer arc surface of the sector-shaped punching sheet, and a second notch and a third notch are provided at both ends of the outer arc surface respectively. The second notch and the third notch of two circumferentially adjacent sector-shaped punching sheets are spliced ​​into a combined notch, and the arc center angle corresponding to the combined notch is equal to the arc center angle corresponding to the first notch; in any two adjacent layers of the stator punching sheets, the first notch of one layer of the stator punching sheets is aligned with the combined notch of the other layer of the stator punching sheets, and the first notch and the combined notch of each layer of the stator punching sheets are combined along the axial direction of the stator core to form a welding groove; one side edge of the sector-shaped punching sheet is provided with a neck-shaped protrusion, and the other side edge of the sector-shaped punching sheet is provided with a groove matching the shape of the protrusion.

[0008] In an optional embodiment of the present invention, the fan-shaped punching sheet is provided with heat dissipation holes and mounting holes, and two groups of heat dissipation holes and mounting holes are respectively provided. The two groups of heat dissipation holes and mounting holes are spaced apart by β / 2 in the circumferential direction of the stator core.

[0009] In an optional embodiment of the present invention, a heat dissipation pipe is provided in the heat dissipation hole, and the heat dissipation pipe extends to the end of the annular stator away from the bearing. The end of the heat dissipation pipe extending outside the annular stator is connected to an arc-shaped flat tube, the axis of the annular direct-drive motor is placed horizontally, the arc length direction of the arc-shaped flat tube is arranged along the circumference of the annular stator, and the arc-shaped flat tube has a downward slope from the end away from the heat dissipation pipe to the heat dissipation pipe, and the heat dissipation pipe and the arc-shaped flat tube are filled with a heat dissipation medium made of phase change material.

[0010] In an optional embodiment of the present invention, the annular stator further includes stator clamping plates arranged at both ends of the stator core, the stator clamping plates, the stator core and the outer ring are connected by bolts, and the bolts pass through the stator core through the mounting holes.

[0011] In an optional embodiment of the present invention, the annular rotor further comprises rotor clamps arranged at both ends of the rotor core, and the rotor clamps, the rotor core and the inner ring are connected by bolts; a centrifugal impeller is provided at one end of the annular rotor away from the bearing, and the centrifugal impeller is arranged corresponding to the arc-shaped flat tube in the axial direction of the annular direct-drive motor.

[0012] In an optional embodiment of the present invention, the outer ring surface of the inner ring is provided with two annular outer raceways, and the side where the two outer raceways are close to each other is recessed toward the center of the inner ring, and a first annular roller is provided on this side; the inner ring surface of the outer ring is provided with two annular inner raceways, and the side where the two inner raceways are away from each other is recessed toward the direction away from the center of the outer ring, and a second annular roller is provided on this side; the roller is accommodated between the inner raceway and the outer raceway, and the roller forms a rolling fit with the first annular roller and the second annular roller; the outer ring includes a first outer ring and a second outer ring which are arranged separately, the first outer ring and the second outer ring are connected by bolts, and one of the inner raceways is provided on the inner ring surface of each of the first outer ring and the second outer ring.

[0013] In an optional embodiment of the present invention, the annular rotor is provided with annular grating strips for detection by a grating reader to identify the rotation speed of the annular rotor.

[0014] The technical effect of the present invention is that: due to the adoption of an annular design, the overall structure of the motor is more compact, the design of the annular stator and the annular rotor enables the motor to be better integrated into the CT equipment, reducing the occupied space, and the use of split sector-shaped punchings in the present invention can make more efficient use of materials. Compared with the integral stator punchings, the shape of the sector-shaped punchings can better adapt to the material cutting in the production process, reducing material waste, and the size and shape of the punchings can be optimized according to actual needs to avoid unnecessary material waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional diagram of the installation state of the annular direct-drive motor provided by an embodiment of the present invention; Figure 2 is a three-dimensional diagram of the installation state of the ring-shaped direct-drive motor provided by an embodiment of the present invention from another perspective; Figure 3 is a perspective view of a ring-shaped direct-drive motor provided by an embodiment of the present invention; Figure 4 yes Figure 3 I local enlarged view; Figure 5 is a front view of a ring-shaped direct-drive motor provided by an embodiment of the present invention; Figure 6 yes Figure 5 AA section view; Figure 7 yes Figure 5 BB cross-sectional view; Figure 8 is a front view of a stator core provided by an embodiment of the present invention; Figure 9is a three-dimensional diagram of a stator core provided by an embodiment of the present invention; Figure 10 yes Figure 9 II partial enlarged view; Figure 11 The comparative example provided is Figure 10 A partial magnified image of the same area; Figure 12 is a three-dimensional diagram of a fan-shaped punch provided by an embodiment of the present invention; Figure 13 is a three-dimensional diagram of a heat dissipation pipe and a heat dissipation flat pipe provided by an embodiment of the present invention; Explanation of reference numerals: 100, annular direct drive motor; 101, flange; 10, annular stator; 11, stator core; 110, sector punching; 111, tooth slot; 112, first notch; 113, second notch; 114, third notch; 115, heat dissipation hole; 116, mounting hole; 117, welding slot; 118, protrusion; 119, groove; 12, stator winding; 13, stator clamping plate; 14, heat dissipation hole Heat pipe; 15. Arc-shaped flat tube; 20. Ring rotor; 21. Rotor core; 22. Magnet; 23. Rotor clamp; 30. Bearing; 31. Outer ring; 310. Inner raceway; 311. First outer ring; 312. Second outer ring; 32. Inner ring; 320. Outer raceway; 33. Roller; 34. First annular roller pillow; 35. Second annular roller pillow; 40. Centrifugal impeller; 50. Annular grating bars; 200. Frame. DETAILED DESCRIPTION

[0016] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0017] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0018] The annular direct-drive motor provided by the present invention can be applied to medical equipment, for example, and in particular, used to drive the scanning function module of a CT machine to rotate. There are two main difficulties in using a direct drive method for a CT machine. One is that the motor diameter is too large, and the motor needs to be made into a hollow structure, while the traditional integrated motor punching will lead to a large amount of raw material waste and high manufacturing costs; the second is that due to the omission of the reduction mechanism, the torque demand of the motor is high, the heat load at startup is large, and the heat dissipation performance of the motor is required to be high. To this end, the present invention arranges the motor punching into a split structure, and ensures the assembly accuracy and connection strength between the punchings through a special punching layout method, thereby ensuring the performance of the motor while reducing the manufacturing cost of the motor; in addition, the present invention improves the heat dissipation performance of the motor through a special heat dissipation structure design without affecting the original spatial layout of the CT machine, ensuring that the motor can operate at high loads.

[0019] The technical solution of the present invention is described in detail below with reference to specific embodiments: See also Figure 1-10 As shown in Figures 12 and 13, the annular direct-drive motor 100 provided by the embodiment of the present invention includes an annular stator 10, an annular rotor 20 and a bearing 30; the annular stator 10 includes a stator core 11, the inner ring surface of the stator core 11 is provided with a tooth slot 111, and the stator winding 12 is provided in the tooth slot 111; the annular rotor 20 includes a rotor core 21, the outer ring surface of the rotor core 21 is provided with a magnet 22; the bearing 30 includes an outer ring 31, an inner ring 32 and a roller 33 arranged between the outer ring 31 and the inner ring 32, the outer ring 31 is fixedly connected to the stator core 11, and the inner ring 32 is fixedly connected to the rotor core 21, and the inner ring 32 constitutes the power output end of the annular direct-drive motor 100; the stator core 11 is formed by stacking multiple layers of stator punchings, and each layer of the stator punchings is formed by splicing a plurality of fan-shaped punchings 110 arranged along the circumferential direction.

[0020] The annular design makes the motor's overall structure more compact. The design of the annular stator 10 and annular rotor 20 allows for better integration into CT equipment, reducing space requirements. This is particularly important for miniaturized medical devices requiring high integration. The motor utilizes a direct-drive design, meaning the rotor is directly connected to the driven scanning module via the inner ring 32 of the bearing 30. This eliminates transmission components such as reducers, chains, and belts commonly found in traditional drive systems. This direct drive reduces energy loss and improves efficiency, while also reducing system complexity and maintenance requirements. This direct connection enables highly precise position control, which is crucial for accurate imaging in radiological imaging equipment. Because the inner ring 32, serving as the power output, is fixedly connected to the rotor core 21, power transmission is more stable, helping to maintain a constant motor speed during CT scanning and ensuring scanning continuity and stability. The use of split sector-shaped punchings 110 allows for more efficient material utilization. Compared to integral stator punchings, the shape of the sector-shaped punchings 110 better adapts to material cutting during production, reducing material waste. The size and shape of the punchings can be optimized based on actual needs, avoiding unnecessary material waste. The split design of the fan-shaped punching sheet 110 makes the volume of a single punching sheet smaller, which is convenient for transportation and storage. Compared with the large integral punching sheet, the fan-shaped punching sheet 110 requires less storage space and is more convenient to transport, reducing material loss and cost during transportation.

[0021] It should be understood that in actual applications, a flange 101 can be provided at the end of the inner ring 32 of the bearing 30 away from the motor, the outer ring 31 of the bearing 30 can be installed on the frame 200, and the scanning function module of the CT machine is installed on the flange 101. The scanning function module and the motor are placed at both ends of the bearing 30, which can balance the load at both ends of the bearing 30 to a certain extent.

[0022] See also Figure 8 As shown, in an optional embodiment of the present invention, the inner diameter of the stator core 11 is greater than or equal to 80 cm, and the ratio of the inner diameter to the outer diameter of the stator core 11 is k, and k satisfies the following: 0.8≤k<1. It should be understood that when such large-diameter and relatively slender stator punchings are formed by integral stamping, the material waste is most obvious. Therefore, the split punching solution provided by the present invention is particularly suitable for such large-diameter narrow-sided stators. In a specific embodiment, the inner diameter of the stator core 11 can be, for example, 100 cm or greater, and k can be 0.9 or greater.

[0023] See also Figure 8As shown, in an optional embodiment of the present invention, each of the sector-shaped punching sheets 110 is provided with n tooth slots 111, n is an even number, the angle between the center lines of adjacent tooth slots 111 is α, and the arc center angle corresponding to a single sector-shaped punching sheet 110 is β, wherein β=n*α; the sector-shaped punching sheets 110 of two adjacent layers of the stator punching sheets are staggered along the circumferential direction at a preset angle, and the preset angle is β / 2. It should be understood that the present invention staggers the two adjacent layers of punching sheets by β / 2, which can make the overall distribution of the joints between the sector-shaped punching sheets 110 in the circumferential direction of the stator core 11 more uniform, thereby obtaining a more uniform magnetic field distribution. In addition, this staggered arrangement is also conducive to improving the connection strength between adjacent sector-shaped punching sheets 110, which will be explained in detail in the subsequent description of the welding groove 117. The present invention provides an even number of tooth slots 111 on each sector-shaped punching sheet 110. In this way, after the sector-shaped punching sheet 110 is rotated by β / 2, the tooth slots 111 on the sector-shaped punching sheet 110 can overlap with the tooth slots 111 on the sector-shaped punching sheet 110 in the original position, thereby ensuring that each layer of stator punching sheets can be spliced ​​with the same sector-shaped punching sheet 110, further reducing production costs.

[0024] See also Figure 9 、 10 As shown in Figure 12, in an optional embodiment of the present invention, a first notch 112 is provided at the center of the outer arc surface of the sector-shaped punching piece 110, and a second notch 113 and a third notch 114 are respectively provided at both ends of the outer arc surface. The second notch 113 and the third notch 114 of the two circumferentially adjacent sector-shaped punching pieces 110 are spliced ​​into a combined notch, and the arc center angle corresponding to the combined notch is equal to the arc center angle corresponding to the first notch 112; in any two adjacent layers of the stator punching pieces, the first notch 112 of one layer of the stator punching pieces is aligned with the combined notch of the other layer of the stator punching pieces, and the first notch 112 and the combined notch of each layer of the stator punching pieces are combined along the axial direction of the stator core 11 to form a welding groove 117; one side edge of the sector-shaped punching piece 110 is provided with a necked protrusion 118, and the other side edge of the sector-shaped punching piece 110 is provided with a groove 119 matching the shape of the protrusion 118. The present invention provides notches on the edges of the stator punching sheets. After the stator punching sheets are stacked to form the stator core 11, each notch forms a welding groove 117. Welding is performed in the welding groove 117, which can connect the stator punching sheets into a whole while preventing the weld from protruding from the surface of the stator core 11. In addition, since the two adjacent layers of stator punching sheets of the present invention are staggered, the adjacent two sector-shaped punching sheets 110 of the same layer can be reliably connected through the sector-shaped punching sheets 110 of the adjacent layer. For details, please refer to Figure 10As shown, taking the top stator sheet as an example, the weld that contributes to the circumferential connection of the two fan-shaped sheets 110 on the top layer should be the inverted T-shaped path shown by the dotted line in the figure. If the two adjacent layers of stator sheets are not misaligned, the weld seam will be as follows: Figure 11 As shown, the weld that contributes to the circumferential connection of the two uppermost sector-shaped punching sheets 110 is only the vertical weld between the two sector-shaped punching sheets 110. Figure 10 、 11 It can be seen that the staggered stacking method of the present invention can significantly increase the length of the effective weld between adjacent sector-shaped punchings 110 , thereby improving the structural strength of the stator core 11 .

[0025] See also Figure 12 As shown, in an optional embodiment of the present invention, the fan-shaped punching sheet 110 is provided with a heat dissipation hole 115 and a mounting hole 116, and two groups of the heat dissipation holes 115 and the mounting holes 116 are respectively provided. The two groups of the heat dissipation holes 115 and the mounting holes 116 are spaced β / 2 apart in the circumferential direction of the stator core 11, so that the heat dissipation holes 115 and the mounting holes 116 of two adjacent layers of stator punching sheets can be aligned with each other.

[0026] See also Figure 4 、 7 As shown in Figures 13, in an optional embodiment of the present invention, a heat dissipation pipe 14 is provided in the heat dissipation hole 115, and the heat dissipation pipe 14 extends to the end of the annular stator 10 away from the bearing 30. The end of the heat dissipation pipe 14 extending outside the annular stator 10 is connected to an arc-shaped flat tube 15, and the axis of the annular direct-drive motor 100 is placed horizontally, and the arc length direction of the arc-shaped flat tube 15 is arranged along the circumference of the annular stator 10, and the arc-shaped flat tube 15 has a downward slope from the end away from the heat dissipation pipe 14 to the heat dissipation pipe 14, and the heat dissipation pipe 14 and the arc-shaped flat tube 15 are filled with a heat dissipation medium made of phase change material. It should be understood that since the present invention eliminates the reduction mechanism between the motor and the scanning function module, the electrical torque requirement is higher, which also means that the motor generates more heat during operation. The natural heat dissipation method of the traditional motor obviously cannot meet the heat dissipation requirements of the present invention. At the same time, since the present invention is applied to CT equipment, the space is limited and an oil cooling system cannot be set up. For this reason, the present invention provides a heat dissipation pipe 14 and an arc-shaped flat tube 15, and fills the cavities of the two with a heat dissipation medium made of phase change material. The liquid heat dissipation medium in the heat dissipation pipe 14 absorbs heat and evaporates, and then can diffuse into the arc-shaped flat tube 15. The gaseous heat dissipation medium in the arc-shaped flat tube 15 is pre-cooled and liquefied and then flows back to the heat dissipation pipe 14, thereby realizing the circulation of the heat dissipation medium and improving the heat dissipation efficiency of the stator core 11.

[0027] See also Figure 6 、 7As shown, in an optional embodiment of the present invention, the annular stator 10 further includes stator clamping plates 13 disposed at both ends of the stator core 11. The stator clamping plates 13, the stator core 11, and the outer ring 31 are connected by bolts, and the bolts extend through the stator core 11 through the mounting holes 116. The annular rotor 20 further includes rotor clamping plates 23 disposed at both ends of the rotor core 21. The rotor clamping plates 23, the rotor core 21, and the inner ring 32 are connected by bolts. A centrifugal impeller 40 is provided at the end of the annular rotor 20 distal from the bearing 30. The centrifugal impeller 40 is arranged in the axial direction of the annular direct-drive motor 100 in correspondence with the arc-shaped flat tube 15. This invention eliminates the traditional motor housing. The stator clamping plates 13 and the stator core 11 themselves serve as the motor's support structure, further improving the motor's heat dissipation performance. In addition, the centrifugal impeller 40 provided on the annular rotor 20 further improves the heat dissipation efficiency of the arc-shaped flat tube 15.

[0028] See also Figure 6 、 7 As shown, in an optional embodiment of the present invention, the outer ring surface of the inner ring 32 is provided with two annular outer raceways 320. The side of the two outer raceways 320 that is close to each other is recessed toward the center of the inner ring 32 and is provided with a first annular bolster 34. The inner ring surface of the outer ring 31 is provided with two annular inner raceways 310. The side of the two inner raceways 310 that is away from each other is recessed away from the center of the outer ring 31 and is provided with a second annular bolster 35. The roller 33 is accommodated between the inner raceways 310 and the outer raceways 320, and forms a rolling engagement with the first annular bolster 34 and the second annular bolster 35. The outer ring 31 includes a first outer ring 311 and a second outer ring 312 that are separately provided. The first outer ring 311 and the second outer ring 312 are connected by bolts. The inner ring surfaces of the first outer ring 311 and the second outer ring 312 are each provided with an inner raceway 310, facilitating assembly and maintenance of the bearing. It should be understood that the present invention arranges the bottom surfaces of the two inner raceways 310 and the two outer raceways 320 in an inclined shape. This enables automatic axial alignment of the inner ring 32 and outer ring 31 of the bearing 30, while also enabling the inner ring 32 and outer ring 31 to withstand greater axial loads, thereby improving the stability of the bearing 30. Furthermore, since the recessed sides of the inner raceways 310 and outer raceways 320 are the primary stress-bearing areas and are also most susceptible to wear, and the replacement and repair costs of such large bearings 30 after wear are high, the present invention installs annular bolsters in the recessed areas of the inner raceways 310 and outer raceways 320. The annular bolsters serve as sacrificial material and can be replaced after wear, eliminating the need to replace the entire bearing 30 and reducing equipment maintenance costs.

[0029] See also Figure 4 、 6 As shown in FIG. 7 , in an optional embodiment of the present invention, the annular rotor 20 is provided with an annular grating bar 50 for detection by a grating reader to identify the rotation speed of the annular rotor 20 , so as to accurately control the motor speed.

[0030] In summary, the present invention adopts an annular design, which makes the overall structure of the motor more compact. The design of the annular stator 10 and the annular rotor 20 allows the motor to be better integrated into the CT equipment, reducing the occupied space. The use of the split sector punching 110 can make more efficient use of materials. Compared with the integral stator punching, the shape of the sector punching 110 can better adapt to the material cutting in the production process, reduce material waste, and the size and shape of the punching can be optimized according to actual needs to avoid unnecessary material waste. The present invention sets an even number of tooth slots 111 on each sector punching 110, so that after the sector punching 110 rotates β / 2, the tooth slots on it 111 can overlap with the tooth slots 111 on the original sector punching sheet 110, thereby ensuring that each layer of stator punching sheets can be spliced ​​with the same sector punching sheet 110, further reducing production costs; the present invention sets notches on the edges of the stator punching sheets. After the stator punching sheets are stacked into the stator core 11, each notch forms a welding groove 117. Welding is performed in the welding groove 117, which can connect the stator punching sheets into a whole while preventing the weld from protruding from the surface of the stator core 11; the stator punching sheet 110 can be connected to form a whole. The stator core 11 can be connected to the stator core 11 by the stator punching sheet 111. The stator core 11 can be connected to the stator core 11 by the stator punching sheet 111. The stator core 11 can be connected to the stator core 11 by the stator punching sheet 111. and the arc-shaped flat tube 15, and the cavities of the two are filled with a heat dissipation medium made of a phase change material. The liquid heat dissipation medium in the heat dissipation tube 14 absorbs heat and evaporates to diffuse into the arc-shaped flat tube 15. The gaseous heat dissipation medium in the arc-shaped flat tube 15 is pre-cooled and liquefied and then flows back to the heat dissipation tube 14, thereby realizing the circulation of the heat dissipation medium and improving the heat dissipation efficiency of the stator core 11; the present invention eliminates the outer shell of the traditional motor, and the stator clamping plate 13 and the stator core 11 itself serve as the support mechanism of the motor, further improving the heat dissipation performance of the motor. In addition, the present invention provides a centrifugal impeller 40 on the annular rotor 20, further improving the heat dissipation efficiency of the arc-shaped flat tube 15; the present invention combines the two inner raceways 310 and the two The bottom surface of each outer raceway 320 is set to be inclined, which can realize automatic alignment of the inner ring 32 and the outer ring 31 of the bearing 30 in the axial direction, and at the same time enable the inner ring 32 and the outer ring 31 to withstand a larger axial load, thereby improving the stability of the bearing 30; in addition, since the recessed sides of the inner raceway 310 and the outer raceway 320 are the main force-bearing areas and are also the most susceptible to wear, and the replacement and maintenance costs of such large bearings 30 after wear are high, the present invention provides an annular roller in the recessed areas of the inner raceway 310 and the outer raceway 320. The annular roller serves as a sacrificial material and can be replaced after wear, avoiding the need to replace the entire bearing 30 and reducing equipment maintenance costs.

[0031] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed herein are intended to be covered by the claims of the present invention.

[0032] In the description herein, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of the embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or with other devices, systems, assemblies, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of the embodiments of the present invention.

Claims

1. A ring-shaped direct drive motor, characterized in that: include: An annular stator (10), the annular stator (10) comprising a stator core (11), the inner annular surface of the stator core (11) being provided with tooth slots (111), and the stator windings (12) being provided in the tooth slots (111); An annular rotor (20), the annular rotor (20) comprising a rotor core (21), the outer annular surface of the rotor core (21) being provided with magnetic steel (22); A bearing (30), the bearing (30) comprising an outer ring (31), an inner ring (32), and a roller (33) disposed between the outer ring (31) and the inner ring (32), the outer ring (31) being fixedly connected to the stator core (11), the inner ring (32) being fixedly connected to the rotor core (21), and the inner ring (32) constituting a power output end of the annular direct-drive motor; The stator core (11) is formed by stacking multiple layers of stator punching sheets, and each layer of the stator punching sheets is formed by splicing a plurality of fan-shaped punching sheets (110) arranged in a circumferential direction.

2. The annular direct drive motor according to claim 1, characterized in that: The inner diameter of the stator core (11) is greater than or equal to 80 cm, and the ratio of the inner diameter to the outer diameter of the stator core (11) is k, and k satisfies: 0.8≤k<1.

3. The annular direct drive motor according to claim 2, characterized in that: Each of the sector-shaped punching sheets (110) is provided with n tooth slots (111), n ​​is an even number, the angle between the center lines of adjacent tooth slots (111) is α, and the arc center angle corresponding to a single sector-shaped punching sheet (110) is β, wherein β=n*α; the sector-shaped punching sheets (110) of two adjacent layers of the stator punching sheets are staggered along the circumferential direction at a preset angle, and the preset angle is β / 2.

4. The annular direct drive motor according to claim 3, characterized in that: A first notch (112) is provided at the center of the outer arc surface of the sector-shaped punching sheet (110), and a second notch (113) and a third notch (114) are provided at both ends of the outer arc surface respectively. The second notch (113) and the third notch (114) of two circumferentially adjacent sector-shaped punching sheets (110) are spliced ​​into a combined notch, and the arc center angle corresponding to the combined notch is equal to the arc center angle corresponding to the first notch (112); in any two adjacent layers of the stator punching sheets, the first notch (112) of one layer of the stator punching sheets is aligned with the combined notch of the other layer of the stator punching sheets, and the first notch (112) and the combined notch of each layer of the stator punching sheets are combined along the axial direction of the stator core (11) to form a welding groove (117); one side edge of the sector-shaped punching sheet (110) is provided with a neck-shaped protrusion (118), and the other side edge of the sector-shaped punching sheet (110) is provided with a groove (119) matching the shape of the protrusion (118).

5. The annular direct drive motor according to claim 3, characterized in that: The fan-shaped punching sheet (110) is provided with heat dissipation holes (115) and mounting holes (116), and two groups of the heat dissipation holes (115) and the mounting holes (116) are respectively provided. The two groups of the heat dissipation holes (115) and the mounting holes (116) are spaced apart by β / 2 in the circumferential direction of the stator core (11).

6. The annular direct drive motor according to claim 5, characterized in that: A heat dissipation pipe (14) is provided in the heat dissipation hole (115), and the heat dissipation pipe (14) extends to an end of the annular stator (10) away from the bearing (30). An end of the heat dissipation pipe (14) extending outside the annular stator (10) is connected to an arc-shaped flat tube (15). The axis of the annular direct-drive motor is placed horizontally, and the arc length direction of the arc-shaped flat tube (15) is arranged along the circumference of the annular stator (10). The arc-shaped flat tube (15) has a downward slope from the end away from the heat dissipation pipe (14) to the heat dissipation pipe (14). The heat dissipation pipe (14) and the arc-shaped flat tube (15) are filled with a heat dissipation medium made of phase change material.

7. The annular direct drive motor according to claim 6, characterized in that: The annular stator (10) further comprises stator clamping plates (13) arranged at both ends of the stator core (11); the stator clamping plates (13), the stator core (11) and the outer ring (31) are connected by bolts, and the bolts pass through the stator core (11) through the mounting holes (116).

8. The annular direct drive motor according to claim 7, characterized in that: The annular rotor (20) further comprises rotor clamping plates (23) arranged at both ends of the rotor core (21), wherein the rotor clamping plates (23), the rotor core (21) and the inner ring (32) are connected by bolts; a centrifugal impeller (40) is provided at one end of the annular rotor (20) away from the bearing (30), and the centrifugal impeller (40) is arranged corresponding to the arc-shaped flat tube (15) in the axial direction of the annular direct-drive motor.

9. The annular direct drive motor according to claim 8, characterized in that: The outer ring surface of the inner ring (32) is provided with two annular outer raceways (320), and the side where the two outer raceways (320) are close to each other is recessed in the direction of the center of the inner ring (32), and a first annular roller pillow (34) is provided on this side; the inner ring surface of the outer ring (31) is provided with two annular inner raceways (310), and the side where the two inner raceways (310) are away from each other is recessed in the direction away from the center of the outer ring (31), and a second annular roller pillow (35) is provided on this side; the roller (33) is accommodated Between the inner raceway (310) and the outer raceway (320), the roller (33) forms a rolling fit with the first annular roller (34) and the second annular roller (35); the outer ring (31) includes a first outer ring (311) and a second outer ring (312) that are separately arranged, the first outer ring (311) and the second outer ring (312) are connected by bolts, and an inner raceway (310) is respectively provided on the inner annular surface of the first outer ring (311) and the second outer ring (312).

10. The annular direct drive motor according to claim 1, characterized in that: The annular rotor (20) is provided with an annular grating strip (50) for detection by a grating reader to identify the rotation speed of the annular rotor (20).

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