Bearingless hollow shaft motor

Abstract

The utility model discloses a bearingless hollow shaft motor, which comprises a casing, a stator assembly sleeved on the inner wall of the casing, a rotor assembly arranged in the middle of the stator assembly, a conical expansion shaft seat connected and arranged in the middle of the rotor assembly, an insertion shaft hole arranged in the middle of the conical expansion shaft seat, a protective ring arranged at one end of the casing, and a hollow shaft arranged in the casing. A protection plate is arranged on the side edge of the protection ring, a bearing arranged in the machine shell is omitted, the conical expansion shaft seat is adopted, an external transmission shaft is matched, suspension arrangement of the rotor assembly in the motor is achieved, the bearing can be replaced outside the motor, or the bearing can be lubricated and cooled, and the motor is convenient to use. The problem that the service life of the motor is limited by the service life of a bearing due to the adoption of a built-in bearing in the conventional motor is solved, the maintenance difficulty of the bearing is reduced, and the transmission efficiency and the service life of the bearing are improved to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of motor equipment technology, and in particular to a bearingless hollow shaft motor. Background Technology

[0002] An electric motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Its main function is to generate driving torque and serve as a power source for electrical appliances or various machines. Currently, the rotor of a traditional electric motor is usually supported by bearings. Therefore, mechanical friction occurs during rotor rotation, which makes the bearings wear easily, reduces their service life, and greatly shortens the service life of the motor. Utility Model Content

[0003] The purpose of this invention is to provide a bearingless hollow shaft motor to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a bearingless hollow shaft motor, comprising a housing, a stator assembly fitted on the inner wall of the housing, a rotor assembly in the middle of the stator assembly, a tapered expansion bearing connected to the middle of the rotor assembly, an insertion shaft hole in the middle of the tapered expansion bearing, a protective ring at one end of the housing, and a protective plate on the side of the protective ring.

[0005] Preferably, one end of the housing is provided with a protrusion, through which a plurality of fixing holes are provided, and the other end of the housing is provided with a mounting platform, the side of which is provided with a plurality of threaded holes.

[0006] Preferably, the inner wall of the protective ring is provided with a groove for insertion into the mounting platform, and the side wall of the protective ring is provided with a second threaded hole corresponding to the first threaded hole.

[0007] Preferably, the stator assembly includes stator teeth annularly spliced ​​on the inner wall of the housing, each stator tooth having an insulating block at its end, and a coil wound around the outside of the stator teeth and the insulating blocks.

[0008] Preferably, the stator tooth has an I-shaped cross-section, with a connector strip on one side and a connector groove on the other side that engages with the connector strip.

[0009] Preferably, the rotor assembly includes a fixed seat rotatably disposed in the middle of the housing, a plurality of rotor cores are sleeved on the outer circular wall of the fixed seat, a plurality of mounting slots are circumferentially opened on the rotor cores, permanent magnets are disposed in the mounting slots, and partitions are provided on the outward side of the end of the rotor cores.

[0010] Preferably, the outer circular wall of the fixed seat is provided with a slot, the middle part of the fixed seat is provided with a tapered hole, and the inner wall of the rotor core is provided with a locking block that engages with the slot.

[0011] Preferably, the inner wall of the fixed seat and the outer wall of the tapered expansion bearing are provided with threaded grooves.

[0012] The beneficial effects of this utility model are as follows: By eliminating the built-in bearing of the motor and adopting a tapered expansion bearing seat in conjunction with an external transmission shaft, the rotor assembly inside the motor is suspended, allowing the bearing to be replaced, lubricated, and cooled from the outside of the motor. This solves the problem that the motor lifespan is limited by the bearing lifespan when using built-in bearings, reduces the difficulty of bearing maintenance, and improves transmission efficiency and bearing lifespan to a certain extent. Attached Figure Description

[0013] Figure 1 This is a usage diagram of an embodiment of the present utility model;

[0014] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0015] Figure 3 This is a three-dimensional structural diagram of the housing in an embodiment of the present utility model;

[0016] Figure 4 This is a three-dimensional structural diagram of the stator teeth in an embodiment of this utility model;

[0017] Figure 5 This is a three-dimensional structural diagram of the rotor assembly in an embodiment of the present utility model;

[0018] Figure 6 This is a three-dimensional structural diagram of the rotor core in an embodiment of this utility model;

[0019] Figure 7 This is a three-dimensional structural diagram of the protective ring in an embodiment of this utility model.

[0020] In the diagram: 1. Housing; 101. Protrusion; 102. Fixing hole; 103. Mounting platform; 104. Threaded hole one; 2. Stator assembly; 21. Stator tooth; 211. Connecting strip; 212. Connecting groove; 22. Insulating block; 3. Rotor assembly; 31. Fixing seat; 311. Slot; 312. Tapered hole; 32. Rotor core; 321. Locking block; 33. Mounting groove; 34. Permanent magnet; 35. Partition plate; 4. Tapered expansion bearing seat; 5. Connecting shaft hole; 6. Protective ring; 61. Groove; 62. Threaded hole two; 7. Protective plate; 8. Threaded groove; 9. External drive shaft; 10. External drive equipment mounting base. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1 to 7 This utility model provides a bearingless hollow shaft motor, including a housing 1, a stator assembly 2 sleeved on the inner wall of the housing 1, a rotor assembly 3 in the middle of the stator assembly 2, a tapered expansion bearing seat 4 connected to the middle of the rotor assembly 3, a shaft insertion hole 5 in the middle of the tapered expansion bearing seat 4, a protective ring 6 at one end of the housing 1, and a protective plate 7 on the side of the protective ring 6.

[0023] Specifically, the housing 1 does not have bearings inside. During installation, the external drive shaft and connecting key of the external device to be driven are inserted into the insertion hole 5 of the tapered expansion bearing seat 4, and the tapered expansion bearing seat 4 is locked and fixed with bolts. By setting bearings on the external device to support the external drive shaft, the external drive shaft and the tapered expansion bearing seat 4 can rotate smoothly. By placing the bearings and drive shaft outside the motor, it is easier to disassemble, replace or maintain the bearings, avoiding the limitation of motor life caused by the use of built-in bearings in the drive motor. At the same time, it can further simplify the internal structure of the motor, facilitate the production and assembly of the motor, and directly fix the external drive shaft to the tapered expansion bearing seat 4, which can improve the transmission efficiency.

[0024] like Figure 3 As shown, specifically, one end of the housing 1 is provided with a protrusion 101, and a number of fixing holes 102 are provided through the protrusion 101. The other end of the housing 1 is provided with a mounting platform 103, and the side of the mounting platform 103 is provided with a number of threaded holes 104. By providing a number of fixing holes 102 on the protrusions 101 at the four corners of the housing 1, it is convenient to fix the housing 1 and the stator assembly 2 to the mounting base of the external transmission equipment.

[0025] like Figure 7 As shown, specifically, the inner wall of the protective ring 6 is provided with a groove 61 for insertion into the mounting platform 103, and the side wall of the protective ring 6 is provided with a threaded hole 62 corresponding to the threaded hole 104. The protective ring 6 is threadedly connected to the threaded hole 104 and the threaded hole 62 by bolts, thereby protecting the stator assembly 2 inside the housing 1 through the protective ring 6 and the protective plate 7.

[0026] like Figure 2 and Figure 4As shown, specifically, the stator assembly 2 includes stator teeth 21 annularly spliced ​​on the inner wall of the housing 1. Each stator tooth 21 has an insulating block 22 at its end. A coil (not shown in the figure) is wound around the outside of the stator teeth 21 and the insulating block 22. By inserting and fitting several stator teeth 21 into a ring, and then inserting and installing the insulating block 22 on both sides of several stator teeth 21, and winding the coil around its outside, the stator assembly 2 can be conveniently heat-installed into the housing 1, thus realizing convenient installation of the stator assembly 2.

[0027] Specifically, the stator tooth 21 has an I-shaped cross-section. One side of the stator tooth 21 is provided with a connector strip 211, and the other side of the stator tooth 21 is provided with a connector groove 212 that engages with the connector strip 211. By engaging the connector strip 211 and the connector groove 212, it is easy to achieve the circular splicing of several stator teeth 21.

[0028] like Figure 5 and Figure 6 As shown, specifically, the rotor assembly 3 includes a fixed seat 31 rotatably mounted in the middle of the housing 1. A plurality of rotor cores 32 are sleeved on the outer circular wall of the fixed seat 31. A plurality of mounting slots 33 are annularly opened on the rotor cores 32. Permanent magnets 34 are provided in the mounting slots 33. A partition plate 35 is provided on the outward side of each end of the rotor cores 32. By annularly sleeved to the outer circular wall of the fixed seat 31, and bolted to the inner circular wall of the fixed seat 31 with a conical expansion bearing seat 4, the equipment is made more compact, reducing the space occupied by the equipment.

[0029] Specifically, the outer circular wall of the fixed base 31 is provided with a slot 311, and the middle part of the fixed base 31 is provided with a tapered hole 312. The inner wall of the rotor core 32 is provided with a locking block 321 that engages with the slot 311. By aligning the locking block 321 of the rotor core 32 with the slot 311 of the fixed base 31, it is convenient to heat-install the rotor core 32 onto the outer circular wall of the fixed base 31.

[0030] Specifically, the inner wall of the fixed seat 31 and the outer wall of the tapered expansion shaft seat 4 are provided with threaded grooves 8. By inserting the tapered expansion shaft seat 4 into the tapered hole 312 in the middle of the fixed seat 31 and locking it with the threaded groove 8 by bolts, the tapered expansion shaft seat 4 is locked to the middle of the tapered hole 312, thereby improving the stability of the rotor assembly 3 and the external transmission shaft.

[0031] The working principle of this utility model is as follows: In use, by eliminating the bearing built into the housing 1 and using a tapered expansion bearing 4 in conjunction with an external drive shaft, the rotor assembly 3 inside the motor is suspended. By setting a bearing on the external device to support the external drive shaft, the rotor assembly 3 and the tapered expansion bearing 4 are fixedly connected to the external drive shaft. The housing 1 and the stator assembly 2 are fixedly connected to the mounting base of the external transmission device. Then, through the cooperation between the stator assembly 2 and the rotor assembly 3, the tapered expansion bearing 4 drives the external drive shaft to rotate synchronously and smoothly, thereby driving the external transmission device.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bearingless hollow shaft motor comprising a casing (1), characterized in that; The inner wall of the housing (1) is fitted with a stator assembly (2), the stator assembly (2) is provided with a rotor assembly (3) in the middle, the rotor assembly (3) is connected with a tapered expansion bearing seat (4) in the middle, the tapered expansion bearing seat (4) is provided with a plug-in shaft hole (5) in the middle, the housing (1) is provided with a protective ring (6) at one end, and a protective plate (7) is provided on the side of the protective ring (6).

2. A bearingless hollow shaft motor according to claim 1, characterized in that; The housing (1) has a protrusion (101) at one end, and a number of fixing holes (102) are provided through the protrusion (101). The housing (1) has a mounting platform (103) at the other end, and a number of threaded holes (104) are provided on the side of the mounting platform (103).

3. A bearingless hollow shaft motor according to claim 2, characterized in that; The inner wall of the protective ring (6) is provided with a groove (61) for insertion into the mounting platform (103), and the side wall of the protective ring (6) is provided with a threaded hole (62) corresponding to the threaded hole one (104).

4. A bearingless hollow shaft motor according to claim 1, characterized in that; The stator assembly (2) includes stator teeth (21) arranged in a ring on the inner wall of the housing (1). Each stator tooth (21) has an insulating block (22) at its end. A coil is wound around the stator tooth (21) and the insulating block (22).

5. A bearingless hollow shaft motor according to claim 4, characterized in that; The stator tooth (21) has an I-shaped cross section. One side of the stator tooth (21) is provided with a plug strip (211), and the other side of the stator tooth (21) is provided with a plug groove (212) that is plugged into and cooperates with the plug strip (211).

6. A bearingless hollow shaft motor according to claim 1, characterized in that; The rotor assembly (3) includes a fixed seat (31) rotatably disposed in the middle of the housing (1). The outer circular wall of the fixed seat (31) is fitted with a plurality of rotor cores (32). The rotor cores (32) are provided with a plurality of mounting slots (33) in annular shape. The mounting slots (33) are provided with permanent magnets (34). The rotor cores (32) at the ends are provided with partitions (35) on the outward side.

7. A bearingless hollow shaft motor according to claim 6, characterized in that; The outer circular wall of the fixed seat (31) is provided with a slot (311), and the middle part of the fixed seat (31) is provided with a tapered hole (312). The inner wall of the rotor core (32) is provided with a locking block (321) that engages with the slot (311).

8. A bearingless hollow shaft motor according to claim 6, characterized in that; The inner wall of the fixed seat (31) and the outer wall of the tapered expansion bearing (4) are provided with threaded grooves (8).

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