Hollow motor capable of being used in combination with multiple motors

Abstract

The utility model relates to a hollow motor capable of being used in combination with a plurality of motors, and the motor comprises a stator assembly which comprises a housing and a winding, the winding comprises a winding iron core, and the winding iron core is provided with a plurality of fifth through holes in a penetrating manner; the rotor assembly comprises a motor shaft, a rotor shaft sleeve and a permanent magnet; the front end cover is installed at the front end of the shell, a front end cover outer cylindrical surface is arranged on the outer wall of the front end cover, a plurality of second threaded holes are formed in the front end cover outer cylindrical surface, and a plurality of first through holes are formed in the front end cover in a penetrating mode; the rear end cover is installed at the rear end of the shell, a first rear end cover inner hole is formed in the inner wall of the rear end cover, a plurality of fourth threaded holes are formed in the outer side wall of the rear end cover, the outer cylindrical surface of the front end cover can be inserted into the first rear end cover inner hole, the second threaded holes correspond to the fourth threaded holes, and a plurality of second through holes are formed in the rear end cover in a penetrating mode; and the first through holes, the second through holes and the fifth through holes are in one-to-one correspondence. The utility model can connect a plurality of motors in series for use, and has the beneficial effects of simple structure, convenient positioning and installation and the like.

Description

Technical Field

[0001] The utility model relates to a motor, in particular to a hollow motor which can be used in combination with multiple motors, belonging to the technical field of hollow motors. Background Art

[0002] In the field of modern industrial automation, motors are widely used in various mechanical devices due to their high-precision control capabilities. Traditional motor designs are usually designed to meet the driving needs of a single device. For certain specific working environments, the torque of the rotating motor is required to be large enough, but the size cannot be too large. For example, drilling motors use small motors, which may result in substandard torque. For motors that meet the torque standards, the installation space is often insufficient. Customized slender motors can certainly meet the requirements, but the production process requirements are very high and time-consuming, which increases costs and is expensive, which does not meet the design economy principle.

[0003] Therefore, designing a hollow motor that can be used in combination with multiple units has important practical significance. Utility Model Content

[0004] The utility model mainly aims at the above-mentioned problems existing in the prior art and provides a hollow motor that can be used in combination with multiple motors. The motor has a compact structure and is easy to install and maintain in series, thereby improving the working efficiency and reliability of the motors.

[0005] The purpose of this utility model is mainly achieved through the following solutions:

[0006] A hollow motor that can be used in combination with multiple units includes: a stator assembly, the stator assembly includes a shell and a winding, the winding is coaxially arranged with the shell and fixedly connected to the inner wall of the shell, the winding includes a winding core, and a plurality of fifth through holes are penetrated on the outer wall of the winding core; a rotor assembly, the rotor assembly is located inside the stator assembly and is gap-matched with it, the rotor assembly includes an internally hollow motor shaft, a rotor sleeve fixedly mounted on the middle section of the motor shaft, and a permanent magnet adhered to the outer wall of the rotor sleeve, the rotor assembly and the stator assembly are rotatably connected through a front bearing and a rear bearing; a front end cover, the front end cover is coaxially arranged with the shell and fixedly mounted on the front end of the shell, The front end outer wall of the front end cover is provided with a front end cover outer cylindrical surface, and a plurality of second threaded holes are evenly arranged on the outer cylindrical surface of the front end cover along its axis, and a plurality of first through holes are penetrated on the front end cover; the rear end cover, the rear end cover is coaxially arranged with the shell and fixedly installed on the rear end of the shell, the rear end inner wall of the rear end cover is provided with a rear end cover first inner hole, and a plurality of fourth threaded holes that are connected with the first inner hole of the rear end cover are evenly arranged on the outer side wall of the rear end cover along its axis, the front end cover outer cylindrical surface can be inserted into the first inner hole of the rear end cover, and the second threaded holes correspond one-to-one to the fourth threaded holes, and a plurality of second through holes are penetrated on the rear end cover, and the first through hole, the second through hole and the fifth through hole correspond one-to-one.

[0007] Preferably, the front end outer wall and the rear end outer wall of the shell are respectively provided with a plurality of third through holes connected to the front end cover and a plurality of fourth through holes connected to the rear end cover, and the third through holes and the fourth through holes are evenly circumferentially arranged along the axis of the shell.

[0008] Preferably, a group of second key slots are symmetrically provided on the inner wall of the shell, and a group of bosses are symmetrically provided on the outer wall of the winding core, and the winding core is fixed by the bosses cooperating with the second key slots on the shell.

[0009] Preferably, a motor shaft hole is coaxially provided inside the motor shaft, and a group of flat key mounting grooves are symmetrically provided on the inner wall of the motor shaft hole, and the motor shaft hole is fixed to the equipment shaft through the flat key mounting grooves.

[0010] Preferably, the front end outer wall of the motor shaft is provided with a front end face of the motor shaft for installing the front bearing, and the front end outer wall of the motor shaft is also provided with a first external thread, and a front bearing locking nut for fixing the front bearing is threadedly connected to the first external thread, and a plurality of first threaded holes are evenly arranged on the side surface of the rear end portion of the front end cover, and a front bearing pressure plate is installed through the first threaded hole, and one side of the front bearing pressure plate is in contact with the front bearing.

[0011] Preferably, the rear end outer wall of the motor shaft is provided with a rear end face of the motor shaft for installing a rear bearing, the inner wall of the rear end cover is provided with an elastic retaining ring for fixing the rear bearing, and the interior of the rear end cover is provided with a groove hole for installing the elastic retaining ring.

[0012] Preferably, the front end inner wall of the rear end cover is provided with a second inner hole of the rear end cover for mounting the rear bearing, and the groove hole is located at the second inner hole of the rear end cover.

[0013] Preferably, the side wall of the middle section of the motor shaft is provided with a first keyway, the inner wall of the rotor sleeve is provided with a rotor sleeve fixing flat key used in conjunction with the first keyway, and the rear end outer wall of the motor shaft is also provided with a second external thread, and the second external thread is threadedly connected with a rotor sleeve locking nut for fixing the rotor sleeve.

[0014] Preferably, a rear end outer wall of the front end cover is provided with a plurality of third threaded holes corresponding to the third through holes, and the third threaded holes are evenly arranged circumferentially along the axis of the front end cover.

[0015] Preferably, a front end outer wall of the rear end cover is provided with a plurality of fifth threaded holes corresponding to the fourth through holes, and the fifth threaded holes are evenly arranged circumferentially along the axis of the rear end cover.

[0016] Therefore, compared with the prior art, the utility model has the following advantages:

[0017] (1) The utility model provides a first through hole on the front cover, a fifth through hole on the stator assembly, and a second through hole on the rear cover. The first through hole, the fifth through hole, and the second through hole can be used as lead holes for the three-phase lead wires of the motor and threading holes when multiple motors are used in combination, thereby providing a guarantee for the combined use of multiple motors and facilitating the series connection of subsequent motors. Moreover, when the motors are connected in series, the three-phase lead wires of the previous motor are wired inside the next motor, which can effectively protect the three-phase lead wires and ensure the normal operation of the motors.

[0018] (2) The utility model provides the front end cover outer cylindrical surface, the second threaded hole on the front end cover, and the rear end cover first inner hole and the fourth threaded hole on the rear end cover, so that the rear end cover of the front motor can be connected with the front end cover of the rear motor, eliminating the traditional intermediate connecting piece, making it more convenient to use in series, reducing the connection error and improving the installation accuracy;

[0019] (3) The utility model provides a second keyway on the housing and a boss on the winding core, and the boss is fixed with the second keyway, so as to ensure that the phase sequence of each motor is consistent with the output line position, and the wire holes are also consistent, with accurate positioning, which facilitates the series installation of the motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 It is a cross-sectional view of the utility model;

[0022] Figure 3 It is a side view of the front end cover of the utility model;

[0023] Figure 4 yes Figure 3 Sectional view in the AA direction;

[0024] Figure 5 It is a side view of the rear end cover of the utility model;

[0025] Figure 6 yes Figure 5 Cross-sectional view in the BB direction;

[0026] Figure 7 It is a side view of the motor shaft in the utility model;

[0027] Figure 8 yes Figure 7 Cross-sectional view in CC direction;

[0028] Fig. 9 It is a side view of the rotor assembly in the utility model;

[0029] Fig.10 yes Fig. 9 Cross-sectional view in the middle DD direction;

[0030] Fig.11 It is a side view of the housing in the utility model;

[0031] Fig.12 yes Fig.11 Cross-sectional view in the EE direction;

[0032] Fig.13 It is a side view of the winding in the utility model;

[0033] Fig.14 yes Fig.13 Cross-sectional view in the FF direction;

[0034] Fig.15 It is a side view of the stator assembly in the utility model;

[0035] Fig.16 yes Fig.15 Cross-sectional view in the GG direction;

[0036] Fig.17 It is a side view of the joint use of multiple motors in the utility model;

[0037] Fig.18 yes Fig.17 Cross-sectional view in the HH direction;

[0038] Fig.19 This is a cross-sectional view from another angle when multiple motors are used together in the utility model.

[0039] Illustration: 1-motor shaft, 2-front bearing locking nut, 3-front cover, 4-front bearing, 5-front bearing pressure plate, 6-housing, 7-stator assembly, 8-rotor assembly, 9-rotor sleeve locking nut, 10-rear bearing, 11-rear cover;

[0040] 19-first threaded hole, 20-first through hole, 21-second threaded hole, 22-external cylindrical surface of the front end cover, 23-inner hole of the front end cover, 24-third threaded hole;

[0041] 25-second through hole, 26-first inner hole of the rear end cover, 27-fourth threaded hole, 28-groove hole, 29-second inner hole of the rear end cover, 30-fifth threaded hole;

[0042] 31-motor shaft hole, 32-flat key mounting groove, 33-first external thread, 34-front end face of motor shaft, 35-middle section of motor shaft, 36-first key groove, 37-second external thread, 38-rear end face of motor shaft;

[0043] 41- rotor shaft sleeve, 42- permanent magnet, 43- shaft shaft sleeve fixing flat key;

[0044] 47 - second keyway, 48 - third through hole, 49 - fourth through hole, 50 - boss, 51 - fifth through hole, 52 - winding core, 53 - three-phase lead wire;

[0045] 61 - first motor, 62 - second motor, 63 - third motor. DETAILED DESCRIPTION

[0046] The technical solution of the utility model is further described in detail below through specific embodiments and in combination with the accompanying drawings. It should be understood that the implementation of the utility model is not limited to the following embodiments, and any form of modification and / or change made to the utility model will fall within the protection scope of the utility model.

[0047] In the present invention, unless otherwise specified, all parts and percentages are weight units, and the equipment and raw materials used can be purchased from the market or are commonly used in the field. The methods in the following embodiments, unless otherwise specified, are conventional methods in the field. The components or equipment in the following embodiments, unless otherwise specified, are universal standard parts or components known to those skilled in the art, and their structures and principles are known to those skilled in the art through technical manuals or conventional experimental methods.

[0048] Embodiment 1:

[0049] like Figure 1 , 2As shown, the utility model provides a technical solution, which is a hollow motor that can be used in combination with multiple motors, and is composed of a stator assembly 7, a rotor assembly 8, a front end cover 3 and a rear end cover 11.

[0050] like Fig.15 , 16 As shown, the stator assembly 7 is composed of a cylindrical shell 6 with a hollow interior and a winding. The winding is coaxially arranged with the shell 6 and fixedly connected to the inner wall of the shell 6. The winding includes a winding core 52. A plurality of fifth through holes 51 are penetrated on the outer wall of the winding core 52 along its length direction. The fifth through holes 51 are evenly circumferentially arranged along the axis of the winding. Three-phase lead wires 53 are led out of the winding. When the shell 6 and the winding are installed, the shell 6 is heated, and the winding is pressed into it after being heated to a certain expansion size. The winding and the shell 6 are interference fit, and can be firmly connected after cooling.

[0051] like Fig. 9 , 10 As shown, the above-mentioned rotor assembly 8 is located inside the stator assembly 7 and is clearance-matched therewith. The rotor assembly 8 is composed of an internally hollow motor shaft 1, a rotor sleeve 41 fixedly mounted on the middle section 35 of the motor shaft, and a permanent magnet 42 adhered to the outer wall of the rotor sleeve 41. The rotor assembly 8 and the stator assembly 7 are rotatably connected via a front bearing 4 and a rear bearing 10.

[0052] like Figure 3 , 4 As shown, the front end cover 3 is coaxially arranged with the shell 6 and fixedly installed at the front end of the shell 6 by screws or bolts, and the front end outer wall of the front end cover 3 is provided with a front end cover outer cylindrical surface 22 with a diameter smaller than the front end cover 3, that is, there is a shoulder between the front end cover outer cylindrical surface 22 and the side wall of the front end cover 3, and a plurality of second threaded holes 21 are evenly arranged on the front end cover outer cylindrical surface 22 along its axis, and a plurality of first through holes 20 are penetrated on the front end cover 3 along its length direction, and a plurality of first through holes 20 are evenly arranged along the axis of the front end cover 3.

[0053] like Figure 5 , 6As shown, the rear end cover 11 is coaxially arranged with the housing 6 and fixedly installed at the rear end of the housing 6 by screws or bolts. The rear end inner wall of the rear end cover 11 is provided with a first inner hole 26 of the rear end cover. The outer side wall of the rear end cover 11 is evenly provided with a plurality of fourth threaded holes 27 communicating with the first inner hole 26 of the rear end cover along its axis. The outer cylindrical surface 22 of the front end cover can be inserted into the first inner hole 26 of the rear end cover, and the second threaded hole 21 corresponds to the fourth threaded hole 27 one by one. The outer cylindrical surface 22 of the front end cover is connected to the first inner hole 26 of the rear end cover. There is a clearance fit between 26, and the second threaded hole 21 on the front end cover 3 is aligned with the fourth threaded hole 27 on the rear end cover 11 after the fit, and is fastened with screws or bolts, serving as an important connection point for the motor to be used in series; the rear end cover 11 is provided with a plurality of second through holes 25 along its length direction, and the second through holes 25 are evenly arranged along the axis of the rear end cover 11. The first through hole 20, the second through hole 25 and the fifth through hole 51 correspond to each other one by one, and are used as lead-in holes for three-phase lead-out wires and threading holes when the motor is used in combination.

[0054] Embodiment 2:

[0055] like Fig.11 , 12 As shown, the utility model provides a technical solution for a hollow motor that can be used in combination with multiple units. The difference from Example 1 is that the front end outer wall and the rear end outer wall of the shell 6 are respectively provided with a plurality of third through holes 48 connected to the front end cover 3 and a plurality of fourth through holes 49 connected to the rear end cover 11, and the third through holes 48 and the fourth through holes 49 are evenly circumferentially arranged along the axis of the shell 6.

[0056] Specifically, the mating surface between the rear end outer wall of the front end cover 3 and the front end of the shell 6 is provided with a plurality of third threaded holes 24 corresponding to the third through holes 48. The third threaded holes 24 are evenly circumferentially arranged along the axis of the front end cover 3. The mating surface of the rear end outer wall of the front end cover 3 is inserted into the front end of the shell 6. After mating, the third threaded holes 24 are opposite to the third through holes 48 and are fastened with screws or bolts, and a sealing ring is filled between the front end cover 3 and the shell 6.

[0057] Specifically, the mating surface between the front end outer wall of the rear end cover 11 and the rear end of the shell 6 is provided with a plurality of fifth threaded holes 30 corresponding to the fourth through holes 49. The fifth threaded holes 30 are evenly circumferentially arranged along the axis of the rear end cover 11. The mating surface of the front end outer wall of the rear end cover 11 is inserted into the rear end of the shell 6. After mating, the fifth threaded holes 30 are opposite to the fourth through holes 49 and are fastened with screws or bolts, and a sealing ring is filled between the rear end cover 11 and the shell 6.

[0058] like Fig.13 , 14As shown, the inner wall of the shell 6 is symmetrically provided with a group of second key grooves 47 along its length direction, and the outer side wall of the winding core 52 is symmetrically provided with a group of bosses 50. The winding core 52 is fixed to the second key grooves 47 on the shell 6 through the bosses 50, so as to ensure that the phase sequence of each motor is consistent with the output line position, and the position of the fifth through hole 51 is also consistent, which is convenient for the subsequent series use of motors.

[0059] Embodiment 3:

[0060] like Figure 7 , 8 As shown, the utility model provides a technical solution, which can be used in conjunction with multiple hollow motors. The difference from Example 1 is that a motor shaft hole 31 is coaxially provided inside the motor shaft 1, and a group of flat key mounting grooves 32 are symmetrically provided on the inner wall of the motor shaft hole 31 along its length direction. The motor shaft hole 31 is fixed with the equipment shaft through the flat key mounting grooves 32, and the locking of the equipment shaft and the motor shaft 1 is achieved through a pin shaft.

[0061] Specifically, the front end outer wall of the motor shaft 1 is provided with a motor shaft front end face 34 for installing the front bearing 4, the diameter of the motor shaft front end face 34 is smaller than the diameter of the motor shaft 1, and the front end outer wall of the motor shaft 1 is also provided with a first external thread 33, and the first external thread 33 is threadedly connected with a front bearing locking nut 2 for fixing the front bearing 4, and the inner ring of the front bearing 4 is fixed on the motor shaft 1 by tightening the front bearing locking nut 2 toward the rear end, and a plurality of first threaded holes 19 are evenly arranged on the side surface of the rear end portion of the front end cover 3, and a front bearing pressure plate 5 is installed through the first threaded hole 19, and the left side of the front bearing pressure plate 5 is in contact with the outer ring of the front bearing 4 to achieve the fixation of the outer ring of the front bearing 4 and the front end cover 3, and a front end cover inner hole 23 is provided inside the rear end of the front end cover 3, and the outer wall of the front bearing 4 is in contact with the inner wall of the front end cover inner hole 23, and a shoulder blocking the outer ring of the front bearing 4 should be provided on one side of the front end cover inner hole 23.

[0062] Specifically, the rear end outer wall of the motor shaft 1 is provided with a motor shaft rear end face 38 for installing the rear bearing 10. The diameter of the motor shaft rear end face 38 is smaller than the diameter of the motor shaft 1, that is, there is a shaft shoulder at the front end of the motor shaft rear end face 38. The inner wall of the rear end cover 11 is installed with an elastic retaining ring for fixing the rear bearing 10. The interior of the rear end cover 11 is provided with a groove hole 28 for installing the elastic retaining ring. The elastic retaining ring is a prior art, and its front end face can contact the rear end face of the rear bearing 10, thereby realizing the fixed installation of the rear bearing 10.

[0063] Specifically, the front inner wall of the rear end cover 11 is provided with a rear end cover second inner hole 29 for mounting the rear bearing 10 , the outer side of the rear bearing 10 contacts the inner wall of the second inner hole 29 , and the groove hole 28 is located at the rear end cover second inner hole 29 .

[0064] Specifically, a first keyway 36 is provided on the side wall of the middle section 35 of the motor shaft, a rotor sleeve fixing flat key 43 used in conjunction with the first keyway 36 is integrally formed on the inner wall of the rotor sleeve 41, and a second external thread 37 is also provided on the outer wall at the rear end of the motor shaft 1, and a rotor sleeve locking nut 9 for fixing the rotor sleeve 41 is threadedly connected to the second external thread 37. By tightening the rotor sleeve locking nut 9 toward the front end, the rotor sleeve 41 can be fixedly installed on the motor shaft 1, and the rotor sleeve 41 can be axially fixed.

[0065] like Fig.17 , 18 As shown in Figures 1 and 19, three motors are used in series in this embodiment, namely, a first motor 61, a second motor 62 and a third motor 63. The rear end cover 11 of the front motor is matched with the front end cover 3 of the rear motor, the connection holes are aligned and fastened with screws or bolts; the connection holes and the wire holes of the front and rear end covers are designed to be consistent in relative position, and after installation, the wire holes on the front and rear end covers are directly opposite to the wire holes on the winding; the motor threading method is as follows: the three-phase lead wire 53 of the first motor 61 can pass through the first through hole 20, the fifth through hole 51 and the second through hole 25 of the front end cover 3 of the second motor 62 and the third motor 63 and the rear end cover 11, and then pass through the internal space of the motor to be led out together with the three-phase lead wire 53 of the second motor 62 and the third motor 63. The phase lead-out wire 53 and the same phase wire are connected in parallel to enable joint drive; the number of motors used in series is not limited to 3, but is limited to the number of wires that can pass through the motor wire holes, and the wire holes can be set to a corresponding number according to actual needs; the above-mentioned motor threading method only provides an example, which can be adaptively changed according to the actual construction situation, as long as the normal operation of the motor can be guaranteed; in addition, it should be noted that the motor has no encoder, and after multiple motors are installed in series, an external encoder can be installed for unified synchronous control with high precision, and its specific connection method will not be repeated here; in addition, the motor can be isolated from the inside and outside, and sealing measures can be taken, so it can be used in a liquid cooling environment, and the threading holes can be used as a circulation path for the coolant to achieve the purpose of liquid cooling, and similarly, the purpose of air cooling can also be achieved.

[0066] The utility model provides a hollow motor that can be used in combination with multiple motors. Through the first through hole of the front cover, the fifth through hole on the stator assembly and the second through hole on the rear cover, the first through hole, the fifth through hole and the second through hole can be used as the lead holes for the three-phase lead wires of the motor and the threading holes when the multiple motors are used in combination, which provides a guarantee for the combined use of the multiple motors and is convenient for the series use of the subsequent motors. Moreover, when the motors are connected in series, the three-phase lead wires of the previous motor are wired inside the next motor, which can effectively protect the three-phase lead wires and ensure the normal operation of the motors. The outer cylindrical surface of the front end cover, the second threaded hole on the front end cover, and the first inner hole and the fourth threaded hole on the rear end cover enable the rear end cover of the previous motor to be connected with the front end cover of the next motor in cooperation with each other, eliminating the traditional intermediate connecting parts, which is more convenient for series use, reduces connection errors, and improves installation accuracy; by providing a second keyway on the shell and a boss on the winding core, the boss is fixed with the second keyway, which can ensure that the phase sequence of each motor is consistent with the lead-out position, and the lead-through holes are also consistent, with accurate positioning, which facilitates the series installation of the motors.

[0067] It should be understood that this embodiment is only used to illustrate the present invention and is not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. Multiple hollow motors can be used together, characterized in that: include: A stator assembly (7), the stator assembly (7) comprising a housing (6) and a winding, the winding being coaxially arranged with the housing (6) and fixedly connected to the inner wall of the housing (6), the winding comprising a winding core (52), and a plurality of fifth through holes (51) being penetrated through the outer wall of the winding core (52); A rotor assembly (8), the rotor assembly (8) being located inside the stator assembly (7) and being clearance-matched therewith, the rotor assembly (8) comprising an internally hollow motor shaft (1), a rotor sleeve (41) fixedly mounted on the middle section (35) of the motor shaft, and a permanent magnet (42) adhered to the outer wall of the rotor sleeve (41), the rotor assembly (8) and the stator assembly (7) being rotationally connected via a front bearing (4) and a rear bearing (10); A front end cover (3), the front end cover (3) is coaxially arranged with the housing (6) and fixedly mounted on the front end of the housing (6), the front end outer wall of the front end cover (3) is provided with a front end cover outer cylindrical surface (22), and a plurality of second threaded holes (21) are evenly arranged on the front end cover outer cylindrical surface (22) along its axis, and a plurality of first through holes (20) are penetrated through the front end cover (3); A rear end cover (11), the rear end cover (11) is coaxially arranged with the shell (6) and fixedly installed at the rear end of the shell (6), the rear end inner wall of the rear end cover (11) is provided with a first inner hole (26) of the rear end cover, and the outer side wall of the rear end cover (11) is evenly provided with a plurality of fourth threaded holes (27) connected with the first inner hole (26) of the rear end cover along its axis, the outer cylindrical surface (22) of the front end cover can be inserted into the first inner hole (26) of the rear end cover, and the second threaded hole (21) corresponds to the fourth threaded hole (27) one by one, and the rear end cover (11) is penetrated by a plurality of second through holes (25), and the first through hole (20), the second through hole (25) and the fifth through hole (51) correspond one by one.

2. The hollow motor that can be used in combination with multiple motors according to claim 1 is characterized in that: The front end outer wall and the rear end outer wall of the shell (6) are respectively provided with a plurality of third through holes (48) connected to the front end cover (3) and a plurality of fourth through holes (49) connected to the rear end cover (11); the third through holes (48) and the fourth through holes (49) are both evenly circumferentially arranged along the axis of the shell (6).

3. The hollow motor that can be used in combination with multiple motors according to claim 2 is characterized in that: The inner wall of the shell (6) is symmetrically provided with a group of second key slots (47), and the outer wall of the winding core (52) is symmetrically provided with a group of bosses (50), and the winding core (52) is fixed in cooperation with the second key slots (47) on the shell (6) through the bosses (50).

4. The hollow motor that can be used in combination with multiple motors according to claim 1 is characterized in that: A motor shaft hole (31) is coaxially arranged inside the motor shaft (1), and a group of flat key mounting grooves (32) are symmetrically arranged on the inner wall of the motor shaft hole (31), and the motor shaft hole (31) is fixedly matched with the equipment shaft through the flat key mounting grooves (32).

5. The hollow motor that can be used in combination with multiple motors according to claim 4 is characterized in that: The front end outer wall of the motor shaft (1) is provided with a motor shaft front end face (34) for mounting a front bearing (4), and the front end outer wall of the motor shaft (1) is also provided with a first external thread (33), and a front bearing locking nut (2) for fixing the front bearing (4) is threadedly connected to the first external thread (33), and a plurality of first threaded holes (19) are evenly arranged on the side surface of the rear end of the front end cover (3), and a front bearing pressure plate (5) is installed through the first threaded hole (19), and one side of the front bearing pressure plate (5) is in contact with the front bearing (4).

6. The hollow motor that can be used in combination with multiple motors according to claim 5, characterized in that: The rear end outer wall of the motor shaft (1) is provided with a motor shaft rear end face (38) for mounting a rear bearing (10), the inner wall of the rear end cover (11) is provided with an elastic retaining ring for fixing the rear bearing (10), and the interior of the rear end cover (11) is provided with a groove hole (28) for mounting the elastic retaining ring.

7. The hollow motor that can be used in combination with multiple motors according to claim 6, characterized in that: The front end inner wall of the rear end cover (11) is provided with a rear end cover second inner hole (29) for mounting the rear bearing (10), and the groove hole (28) is located at the rear end cover second inner hole (29).

8. The hollow motor that can be used in combination with multiple motors according to claim 7, characterized in that: The side wall of the middle section (35) of the motor shaft is provided with a first keyway (36), the inner wall of the rotor sleeve (41) is provided with a rotor sleeve fixing flat key (43) used in conjunction with the first keyway (36), and the rear end outer wall of the motor shaft (1) is also provided with a second external thread (37), and a rotor sleeve locking nut (9) for fixing the rotor sleeve (41) is threadedly connected to the second external thread (37).

9. The hollow motor that can be used in combination with multiple motors according to claim 2, characterized in that: The rear end outer wall of the front end cover (3) is provided with a plurality of third threaded holes (24) corresponding to the third through holes (48), and the third threaded holes (24) are evenly arranged along the axis of the front end cover (3).

10. The hollow motor that can be used in combination with multiple motors according to claim 2, characterized in that: The front end outer wall of the rear end cover (11) is provided with a plurality of fifth threaded holes (30) corresponding to the fourth through holes (49), and the fifth threaded holes (30) are evenly arranged along the axis of the rear end cover (11).

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