Rotor structure and motor

Abstract

The invention provides a rotor structure and a motor, and the rotor structure comprises a bushing assembly which is internally provided with a rotating shaft in a sleeving manner, and is externally provided with a rotor iron core in a sleeving manner; the bushing assembly comprises a first bushing and a second bushing, and the first bushing and the second bushing are detachably connected in the axial direction of the bushing assembly. According to the invention, the technical problems that a rotor bushing in the prior art has a fixed length, cannot adapt to different electronic requirements, is poor in universality and the like can be solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of electric machines, and particularly relates to a rotor structure and an electric machine. BACKGROUND

[0002] High-speed electric machines generally use magnetic suspension bearings or air suspension bearings to support the rotor, so that the rotor is suspended in the air. Thus, mechanical friction is 0 when the electric machine is running, which can effectively reduce the loss and heat of the high-speed electric machine, and the high-speed electric machine also has the advantages of no need for lubrication, no oil pollution, and the like, and can improve the critical speed of the electric machine and prolong the service life. The high-speed electric machine rotor is divided into surface-mounted and built-in types, and is the main research direction of the high-speed electric machine rotor at present. The present application mainly focuses on the built-in high-speed electric machine rotor.

[0003] The existing built-in high-speed electric machine rotor is applied to customers, and the customers use the same electric machine rotor shaft and the shell, end cover and the like to realize the electric machine complete machine of multiple different power segments, so as to improve the universality. The electric machine stator part can be changed in the way of stacking height and winding to realize universality. However, the electric machine rotor part needs to process different lengths of rotor bushings for each electric machine to adapt to the length requirements of the electric machine rotor of different power segments. This results in low universality of the bushing, high procurement cost, long cycle, and slow response to customer orders.

[0004] Since the rotor bushing in the prior art has a fixed length and cannot adapt to different electronic requirements, the universality is poor, and the like, the application researches and designs a rotor structure and an electric machine. SUMMARY

[0005] Therefore, the application provides a rotor structure and an electric machine, which can solve the technical problems of the rotor bushing in the prior art, such as fixed length, inability to adapt to different electronic requirements, poor universality and the like.

[0006] In order to solve the above problems, the application provides a rotor structure, which comprises: a bushing assembly, a rotating shaft is sleeved in the bushing assembly, and a rotor core is sleeved outside the bushing assembly. The bushing assembly comprises a first bushing and a second bushing, and the first bushing and the second bushing are detachably connected along the axial direction of the bushing assembly.

[0007] In some embodiments, the first bushing has a first end and a second end, the first end is provided with a second groove, the second groove penetrates the outer wall of the first bushing, the second groove is annular, one end of the second bushing is provided with a third groove, the third groove penetrates the inner wall of the second bushing, the second groove and the third groove extend along the circumferential direction of the rotating shaft, and the side wall of the third groove is threadedly connected with the side wall of the second groove along the radial direction of the first bushing.

[0008] In some embodiments, the sum of the width of the third groove and the width of the second groove is equal to the wall thickness of the first sleeve along the radial direction of the first sleeve, and the wall thickness of the first sleeve and the second sleeve is the same.

[0009] In some embodiments, a first fixing hole is arranged on the sidewall of the third groove, the first fixing hole penetrates the sidewall of the third groove and is at least partially located in the sidewall of the second groove, and a first fixing member is arranged in the first fixing hole.

[0010] In some embodiments, a fourth groove is arranged on the outer wall of the sleeve assembly, the fourth groove penetrates the sleeve assembly along the axial direction of the sleeve assembly, the inner wall of the rotor core is provided with a third protrusion matched with the fourth groove, and the first fixing hole is located at the groove bottom of the fourth groove.

[0011] In some embodiments, a fifth groove is arranged on the inner wall of the sleeve assembly, the fifth groove penetrates the sleeve assembly along the axial direction of the sleeve assembly, and a first protrusion is arranged on the shaft and matched with the fifth groove.

[0012] In some embodiments, the second end is provided with a first protrusion extending along the circumferential direction of the first sleeve, the first protrusion extends in the direction outward along the radial direction of the first sleeve, the outer diameter of the first protrusion is greater than the inner diameter of the rotor core, and a baffle is arranged between the first protrusion and the end of the rotor core.

[0013] In some embodiments, the other end of the second sleeve is provided with a first groove penetrating the outer circumferential wall of the second sleeve, the first groove extends along the circumferential direction of the second sleeve, and a nut is connected to the sidewall of the first groove along the radial direction of the second sleeve, and a baffle is arranged between the first nut and the end of the rotor core.

[0014] In some embodiments, a second fixing hole is arranged on the sidewall of the first groove along the radial direction of the second sleeve, and a second fixing member is arranged on the nut and connected in the second fixing hole after penetrating the nut.

[0015] The application also provides an electric machine comprising the aforementioned rotor structure.

[0016] The rotor structure and the electric machine provided by the application have the following beneficial effects: Through the detachable connection of the first bushing and the second bushing, the universality of the high-speed rotor of different lengths of power sections is improved, the problems of high procurement cost, long period, and slow customer order response are solved, batch spare parts can be prepared, and different lengths of motor rotors can be quickly combined according to the magnet and the required power section of the customer, so that the rotor dynamics performance is ensured, the universality is improved, the cost is reduced, and the quick delivery is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. The drawings in the following description are only exemplary, and other embodiments can be derived from the provided drawings without creative labor for those skilled in the art.

[0018] Figure 1 is the assembly structure diagram of the first bushing and the second bushing in the rotor structure of the present application; Figure 2 is the structure schematic of the rotor structure of the present application Figure One ; Figure 3 is the structure schematic of the rotor structure of the present application Figure Two ; Figure 4 is the structure schematic of the rotor structure of the present application Figure Three ; Figure 5 is the structure schematic of the rotor structure of the present application Figure Four ; Figure 6 is the structure schematic of the rotor structure of the present application Figure Three .

[0019] The drawings are as follows: 1, first bushing; 2, second bushing; 3, first fixing hole; 4, rotor core; 5, baffle; 6, magnet; 7, second protrusion; 8, nut; 9, third fixing hole; 10, second fixing hole; 11, first recess; 12, first protrusion; 13, third protrusion; A, threaded cooperation. DETAILED DESCRIPTION

[0020] Clearly, the embodiments described are only a part of all the embodiments of the present application, rather than all the embodiments. The description of the at least one example embodiment is merely illustrative, and is by no means intended to limit the present application and its application or use in any way. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of the present application.

[0021] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicated orientation or position relationship are generally based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, without the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0022] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial position relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the example term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0023] In addition, it should be noted that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation on the scope of protection of the present application.

[0024] For reference Figures 1-6 As shown, according to the embodiment of the present application, a rotor structure is provided, comprising: a bushing assembly, a rotating shaft is sleeved in the bushing assembly, and a rotor core 4 is sleeved outside the bushing assembly; The bushing assembly comprises a first bushing 1 and a second bushing 2, which are detachably connected along the axial direction of the bushing assembly.

[0025] In the technical solution, the first bushing 1 and the second bushing 2 are detachably connected, which solves the problems of low universality, high procurement cost, long period, and slow customer order response of high-speed rotors of different lengths of power sections, and simultaneously enables batch material preparation, rapid combination of motor rotors of different lengths according to the requirements of magnetic steel and customer required power section motors, ensures the satisfaction of the dynamics performance of the rotor, improves the universality, reduces the cost, and ensures rapid delivery.

[0026] In some embodiments, the rotor core 4 is formed by laminating silicon steel sheets, and a third fixing hole 9 is arranged on the rotor core 4 along the axial direction of the rotor core 4. A positioning pin can be inserted into the third fixing hole 9 to position and fix the laminated silicon steel sheets. This facilitates the insertion of the magnetic steel and the locking of the locking nut 8 without dislocation of the silicon steel sheets.

[0027] In some embodiments, the first bushing 1 has a first end and a second end, the first end is provided with a second groove, the second groove penetrates the outer wall of the first bushing 1, the second groove is annular, one end of the second bushing 2 is provided with a third groove, the third groove penetrates the inner wall of the second bushing 2, the second groove and the third groove extend along the circumferential direction of the shaft, along the radial direction of the first bushing 1, and the side wall of the third groove is threadedly connected with the side wall of the second groove.

[0028] In the technical solution, the side wall of the third groove is threadedly connected with the side wall of the second groove, in combination with the threaded cooperation A shown in Figure 6 , so that the first bushing 1 and the second bushing 2 are connected by threads, the disassembly efficiency of the first bushing 1 and the second bushing 2 is improved, and when different lengths of bushings are required, only the length of the second bushing 2 needs to be adjusted, and then the first bushing 1 and the second bushing 2 are threadedly connected. The entire rotor realizes material standardization and universalization, and different rotor length requirements of different power sections can be realized according to customer requirements.

[0029] In some embodiments, along the radial direction of the first bushing 1, the sum of the width of the third groove and the width of the second groove is equal to the wall thickness of the first bushing 1, and the wall thicknesses of the first bushing 1 and the second bushing 2 are the same.

[0030] In the technical solution, the adaptability of the first bushing 1 and the second bushing 2 is ensured, which is used for the extension of the second bushing 2 or the connection of multiple second bushings 2 to realize the lengthening of the overall bushing and form the entire rotor structure.

[0031] In some embodiments, a first fixing hole 3 is arranged on the sidewall of the third groove, the first fixing hole 3 penetrates the sidewall of the third groove and is at least partially located in the sidewall of the second groove, and a first fixing member is arranged in the first fixing hole 3.

[0032] In the technical solution, the first fixing hole 3 can be a pin hole, the first fixing member can be a pin, and the stability of the connection between the first bushing 1 and the second bushing 2 is ensured through the cooperation of the pin and the pin hole.

[0033] In some embodiments, a fourth groove is arranged on the outer wall of the bushing assembly, the fourth groove penetrates the bushing assembly along the axial direction of the bushing assembly, the inner wall of the rotor core 4 is provided with a third protrusion 13, the third protrusion 13 is matched with the fourth groove, and the first fixing hole 3 is located at the groove bottom of the fourth groove.

[0034] In the technical solution, the third protrusion 13 is matched with the fourth groove to limit the circumferential direction of the bushing assembly and the rotor core 4, the stability between the bushing assembly and the rotor core 4 is improved, the first fixing hole 3 is located at the groove bottom of the fourth groove, the pin can be hidden, and the problem of pin falling off during the operation of the motor is avoided.

[0035] In some embodiments, a fifth groove is arranged on the inner wall of the bushing assembly, the fifth groove penetrates the bushing assembly along the axial direction of the bushing assembly, and a first protrusion 7 is arranged on the shaft, and the first protrusion 7 is matched with the fifth groove.

[0036] In the technical solution, the first protrusion 7 is matched with the fifth groove to limit the circumferential direction of the bushing assembly and the shaft, and the stability between the bushing assembly and the shaft is improved. It should be noted that the first protrusion 7 extends along the length direction of the shaft.

[0037] It should be noted that the third protrusion 13 extends along the length direction of the rotor core 4. The rotor core 4 is provided with a magnetic steel 6.

[0038] In some embodiments, the second end is provided with a first protrusion 12, the first protrusion 12 extends along the circumferential direction of the first bushing 1, the first protrusion 12 extends in the direction of the radial outward of the first bushing 1, the outer diameter of the first protrusion 12 is greater than the inner diameter of the rotor core 4, and a baffle 5 is arranged between the first protrusion 12 and the end of the rotor core 4.

[0039] The technical scheme, through the first protrusion 12, pressure is applied to the rotor core 4 during assembly, a baffle 5 is arranged between the first protrusion 12 and the end of the rotor core 4, so that the rotor core 4 is not directly pressed by the first protrusion 12, and damage to the rotor core 4 is avoided.

[0040] In some embodiments, the other end of the second bushing 2 is provided with a first groove 11 penetrating the peripheral wall of the second bushing 2, the first groove 11 extends along the circumference of the second bushing 2 and along the radial direction of the second bushing 2, and a nut 8 is connected to the side wall of the first groove 11, and a baffle 5 is arranged between the first nut 8 and the end of the rotor core 4.

[0041] In the technical scheme, in order to facilitate the length adjustment of the bushing assembly, the other end of the second bushing 2 is threadedly connected with the nut 8, so that pressure is applied to the rotor core 4, and the nut 8 and the first protrusion 12 cooperate to limit and fix the axial direction of the rotor core 4, thereby improving the stability between the rotor core 4 and the bushing assembly.

[0042] In some embodiments, along the radial direction of the second bushing 2, a second fixing hole 10 is arranged on the side wall of the first groove 11, and a second fixing member is arranged on the nut 8, and the second fixing member is connected in the second fixing hole 10 after penetrating the nut 8.

[0043] In the technical scheme, the second fixing hole 10 can be a pin hole, and the second fixing member can be a pin, and the cooperation of the pin and the pin hole ensures the stability of the connection between the nut 8 and the second bushing 2.

[0044] The rotor structure of the present application reduces the number of parts and improves the utilization rate of silicon steel; the stacking process hole can realize uniform and unified stacking, improve production and processing efficiency and product consistency; the cooperation between the first bushing 1 and the second bushing 2 can realize part standardization; the finished product is diversified; different power section rotor product production and processing can be realized quickly; the pin placed in the fourth groove can realize hiding and anti-loosening, improve the reliability of the bushing connection; the locking nut 8 is quickly locked, realizes simple production, avoids welding or hot mounting; improves production efficiency, and is also convenient for disassembly and assembly.

[0045] The present application also provides an electric machine comprising the above-mentioned rotor structure.

[0046] Those skilled in the art will readily understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0047] The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above merely describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A rotor structure, characterized in that: Includes: a bushing assembly, wherein a rotating shaft is fitted inside the bushing assembly and a rotor core (4) is fitted outside the bushing assembly. The bushing assembly includes a first bushing (1) and a second bushing (2), which are detachably connected along the axial direction of the bushing assembly.

2. The rotor structure according to claim 1, characterized in that: The first bushing (1) has a first end and a second end. The first end is provided with a second groove. The second groove penetrates the outer wall of the first bushing (1). The second groove is annular. One end of the second bushing (2) is provided with a third groove. The third groove penetrates the inner wall of the second bushing (2). The second groove and the third groove extend circumferentially along the shaft and radially along the first bushing (1). The sidewall of the third groove is threadedly connected to the sidewall of the second groove.

3. The rotor structure according to claim 2, characterized in that: Along the radial direction of the first bushing (1), the sum of the width of the third groove and the width of the second groove is equal to the wall thickness of the first bushing (1), and the wall thicknesses of the first bushing (1) and the second bushing (2) are the same.

4. The rotor structure according to claim 2, characterized in that: A first fixing hole (3) is provided on the side wall of the third groove. The first fixing hole (3) penetrates the side wall of the third groove and is at least partially located inside the side wall of the second groove. A first fixing member is provided inside the first fixing hole (3).

5. The rotor structure according to claim 4, characterized in that: A fourth groove is provided on the outer wall of the bushing assembly. The fourth groove penetrates the bushing assembly along the axial direction of the bushing assembly. A third protrusion (13) is provided on the inner wall of the rotor core (4). The third protrusion (13) matches the fourth groove. The first fixing hole (3) is located at the bottom of the fourth groove.

6. The rotor structure according to claim 1, characterized in that: A fifth groove is provided on the inner wall of the bushing assembly. The fifth groove passes through the bushing assembly along the axial direction of the bushing assembly. A first protrusion (7) is provided on the rotating shaft, and the first protrusion (7) matches the fifth groove.

7. The rotor structure according to claim 2, characterized in that: The second end is provided with a first protrusion (12), the first protrusion (12) extends circumferentially along the first bushing (1), and the first protrusion (12) extends radially outward along the first bushing (1). The outer diameter of the first protrusion (12) is larger than the inner diameter of the rotor core (4). A baffle (5) is provided between the first protrusion (12) and the end of the rotor core (4).

8. The rotor structure according to claim 2, characterized in that: The other end of the second bushing (2) is provided with a first groove (11), which penetrates the outer peripheral wall of the second bushing (2). The first groove (11) extends along the circumference of the second bushing (2) and along the radial direction of the second bushing (2). A nut (8) is connected to the side wall of the first groove (11), and a baffle (5) is provided between the first nut (8) and the end of the rotor core (4).

9. The rotor structure according to claim 8, characterized in that: Along the radial direction of the second bushing (2), a second fixing hole (10) is provided on the side wall of the first groove (11), and a second fixing member is provided on the nut (8). The second fixing member passes through the nut (8) and is connected in the second fixing hole (10).

10. An electric motor, characterized in that: The rotor structure includes any one of claims 1-9.

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