Synchronous direct-drive double-screw rotor assembly and energy-saving motor

Abstract

The application discloses a synchronous direct-drive double-screw rotor assembly and an energy-saving motor, and relates to the technical field of energy-saving motors, which comprises a rotor assembly, the rotor assembly comprises a rotor shaft and a rotor core, the rotor core is fixedly connected to the outer side of the rotor shaft, and the rotor shaft is provided with a first central shaft; the circumferential self-locking structure of the dovetail groove, the dovetail taper block and the wave-shaped elastic sheet is matched with the axial limiting mechanism of the sliding push block at both ends, the situation that the permanent magnet is loose, falls off or even flies out to cause the motor to be stuck under the working condition of high temperature, high speed and large centrifugal force is effectively avoided, the dynamic self-enhancing locking effect that the greater the centrifugal force is, the stronger the circumferential and axial locking force is is realized, the situation that the permanent magnet is loose, falls off or even flies out to cause the motor to be stuck under the working condition of high temperature, high speed and large centrifugal force is effectively avoided, the operation reliability and the service life are greatly improved, the motor can always maintain a stable and efficient energy-saving state in long-term continuous operation, and the motor is stable and efficient.

Description

Technical Field

[0001] This invention relates to the field of energy-saving electric motor technology, specifically to a synchronous direct-drive twin-screw rotor assembly and an energy-saving electric motor. Background Technology

[0002] In current industrial applications, the mainstream drive system for parallel drive equipment such as screw pumps and screw compressors has long adopted the traditional structure of asynchronous motors and gearboxes. This not only results in high losses from multi-stage transmission and bulky overall size, but also makes it difficult to meet the requirements for low-noise production due to the high noise generated by gear meshing during operation. Furthermore, this type of system requires regular lubrication and maintenance of the gears, which increases the overall life-cycle maintenance costs.

[0003] While existing equipment attempts to improve energy efficiency by adopting a permanent magnet direct drive structure, the industry pain point of fixing permanent magnets remains unresolved. In existing motor devices, permanent magnets are usually fixed to the rotor core using adhesive. However, under the enormous centrifugal force generated by high temperature and high-speed rotation, the adhesive strength will decrease, easily leading to the magnets loosening, detaching, or even flying out, causing serious malfunctions such as motor jamming, interrupting the production process, and potentially damaging the downstream screw assembly, resulting in high equipment maintenance costs and production capacity losses. Summary of the Invention

[0004] The purpose of this invention is to provide a synchronous direct-drive twin-screw rotor assembly and an energy-saving motor to solve the problem that when using a motor device, the magnets loosen and damage the device due to high temperature and centrifugal force, affecting subsequent use.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a synchronous direct-drive twin-screw rotor assembly, comprising a rotor assembly; The rotor assembly includes a rotor shaft and a rotor core. The rotor core is fixedly connected to the outside of the rotor shaft. The rotor shaft has a first central axis, the direction of which is set as the axial direction. The rotor core can be driven by the rotor shaft to rotate synchronously around the first central axis in the circumferential direction. A dovetail groove is provided on the outside of the rotor core. There are six dovetail grooves evenly distributed in a circumferential array. A dovetail cone is provided on the inside of the dovetail groove. A wave-shaped spring is provided on the outside of each dovetail cone. The end point of the wave-shaped spring is in contact with the outside of the dovetail cone. At the same time, the wave-shaped spring provides a circumferential limiting effect on the dovetail cone. A conical frame is fixedly connected to both sides of the rotor core. The other end of the conical frame is fixedly connected to the outside of the rotor shaft. A guide plate is fixedly connected to the side end of the conical frame. A sliding push block is movably connected to the side end of the guide plate. The sliding push block provides an axial limiting effect on the dovetail cone.

[0006] In a preferred embodiment, one end of the dovetail cone is fixedly connected to an arc-shaped sleeve, the inner side of the arc-shaped sleeve is fixedly connected to a permanent magnet, and the arc-shaped sleeve is disposed on the outer side of the rotor core.

[0007] In a preferred embodiment, L-shaped plates are fixedly connected to both ends of the wave spring, and an L-shaped groove is formed on the inner side of the dovetail groove. The L-shaped plates and the L-shaped groove are mutually adapted to each other, and the L-shaped plates are disposed on the inner side of the L-shaped groove.

[0008] In a preferred embodiment, six guide plates are arranged in a circumferential array and evenly distributed. The side ends of the guide plates are provided with arc-shaped grooves and embedded grooves, which are staggered with each other. An embedded guide post is fixedly connected to one side of the sliding push block. The embedded guide post is adapted to the inner side of the embedded groove. A spherical groove is provided on one side surface of the sliding push block. A sliding ball is movably connected to the inner side of the spherical groove. The outer surface of the sliding ball is adapted to the inner side of the arc-shaped groove.

[0009] In a preferred embodiment, a dovetail opening is provided on one side of the tapered frame. The dovetail opening is located on one side of the guide plate. The arc-shaped groove and the embedded groove are open on the side near the dovetail opening and closed on the side away from the dovetail opening.

[0010] The present invention also provides an energy-saving electric motor, including a mounting base, wherein the upper end of the mounting base is fixedly connected to the electric motor and a twin-screw assembly, and a synchronous direct-drive twin-screw rotor assembly is provided on the inner side of the electric motor.

[0011] In a preferred embodiment, the motor includes a housing frame and a stator core, the stator core being fixedly connected to the inner side of the housing frame, and a stator winding being fixedly connected to the side end of the stator core, and the rotor assembly being disposed inside the stator core and the stator winding.

[0012] In a preferred embodiment, an external box is fixedly connected to the outer side of the machine bay frame, and a motor front cover is fixedly connected to the front end of the machine bay frame. A bearing groove is provided on one side of both the machine bay frame and the motor front cover. A rotating bearing is provided on the inner side of the bearing groove, and the inner side of the rotating bearing is fixedly connected to the outer sides of both ends of the rotor shaft.

[0013] In a preferred embodiment, a motor rear cover is fixedly connected to one side of the machine bay frame, a cooling fan is provided on the inner side of the motor rear cover, and one side of the cooling fan is fixedly connected to the outer side of one end of the rotor shaft.

[0014] In a preferred embodiment, the twin-screw assembly includes a mounting housing, on the inner side of which a first screw and a second screw are disposed, the first screw and the second screw meshing with each other, the first screw having five teeth and the second screw having six teeth.

[0015] Beneficial effects Compared with the prior art, the present invention has the following beneficial effects: 1. This synchronous direct-drive twin-screw rotor assembly, through the circumferential self-locking structure of dovetail grooves, dovetail cones, and wave spring sheets, combined with the axial limiting mechanism of sliding push blocks at both ends, effectively avoids the permanent magnet from loosening, falling off, or even flying out under high temperature, high speed, and high centrifugal force conditions, which could cause the motor to seize up. This achieves a dynamic self-reinforcing locking effect where the greater the centrifugal force, the stronger the circumferential and axial locking forces. This significantly improves operational reliability and service life, avoids the risk of permanent magnet loosening or falling off under high temperature and high load conditions, greatly extends the fault-free operation time of the equipment, reduces production losses caused by unplanned downtime, and allows the motor to maintain a stable, high-efficiency, and energy-saving state during long-term continuous operation. 2. This synchronous direct-drive twin-screw rotor assembly utilizes a lossless transmission design that eliminates the gearbox through permanent magnet direct drive. Combined with the optimized meshing efficiency of the twin-screw asymmetric tooth profile, the overall system transmission efficiency is improved. Compared to the traditional solution of adding a gearbox to the motor drive, it can achieve certain energy-saving effects. Under long-term stable operation, it can significantly reduce the energy consumption and maintenance costs of industrial screw equipment throughout its entire life cycle, making it suitable for high-load industrial scenarios with continuous operation.

[0016] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0017] Figure 1 A schematic diagram of the overall three-dimensional structure of the present invention is shown; Figure 2 This shows a first disassembled schematic diagram of the three-dimensional structure of the electric motor in this invention; Figure 3 This shows a second split schematic diagram of the three-dimensional structure of the electric motor in this invention; Figure 4 A three-dimensional structural diagram of the rotor assembly in this invention is shown; Figure 5 A schematic diagram of the rotor assembly disassembly in this invention is shown; Figure 6 A cross-sectional schematic diagram of some components in this invention is shown; Figure 7 This invention illustrates the following: Figure 6Enlarged schematic diagram of the three-dimensional structure of region A in the middle; Figure 8 A schematic diagram showing the states of some components in this invention is shown; Figure 9 A schematic diagram showing the disassembled conical frame component of this invention is provided. Figure 10 A schematic diagram of the overall three-dimensional structure of the present invention is shown.

[0018] In the diagram: 1. Mounting base; 200. Motor; 201. Machine bay frame; 202. External junction box; 203. Motor front cover; 204. Stator core; 205. Stator winding; 206. Cooling fan; 207. Motor rear cover; 208. Bearing groove; 209. Rotary bearing; 300. Rotor assembly; 301. Rotor shaft; 302. Rotor core; 303. Arc-shaped sleeve; 304. Permanent magnet; 305. Dovetail cone 306. Dovetail groove; 307. L-shaped groove; 308. Wave-shaped spring; 309. L-shaped plate; 310. Conical frame; 311. Guide plate; 312. Arc-shaped slide groove; 313. Embedded groove; 314. Sliding push block; 315. Embedded guide post; 316. Spherical groove; 317. Sliding ball; 318. Dovetail opening; 400. Twin screw assembly; 401. Mounting shell; 402. First screw; 403. Second screw. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0021] Please see Figures 1-10 The present invention provides a technical solution: a synchronous direct-drive twin-screw rotor assembly, including a rotor assembly 300; The rotor assembly 300 includes a rotor shaft 301 and a rotor core 302. The rotor core 302 is fixedly connected to the outside of the rotor shaft 301. The rotor shaft 301 has a first central axis, the direction of which is set as the axial direction. The rotor core 302 can be driven by the rotor shaft 301 to rotate synchronously around the first central axis in the circumferential direction. A dovetail groove 306 is provided on the outer side of the rotor core 302. Six dovetail grooves 306 are provided and evenly distributed in a circumferential array. A dovetail cone 305 is provided on the inner side of the dovetail groove 306. Waveform springs 308 are provided on the outer side of each cone block 305. The end points of the waveform springs 308 are in contact with the outer side of the dovetail cone block 305. At the same time, the waveform springs 308 provide circumferential limiting effect for the dovetail cone block 305. Conical frames 310 are fixedly connected to both sides of the rotor core 302. The other end of the conical frame 310 is fixedly connected to the outer side of the rotor shaft 301. A guide plate 311 is fixedly connected to the side end of the conical frame 310. A sliding push block 314 is movably connected to the side end of the guide plate 311. The sliding push block 314 provides axial limiting effect for the dovetail cone block 305.

[0022] An arc-shaped sleeve 303 is fixedly connected to one end of the dovetail cone block 305. The arc-shaped sleeve 303 has protective edges at both ends to prevent the permanent magnet 304 from falling out of its interior. The permanent magnet 304 is fixedly connected to the inner side of the arc-shaped sleeve 303. The arc-shaped sleeve 303 is located on the outer side of the rotor core 302, and the rotor core 302 is fixedly located on the inner side of the arc-shaped sleeve 303 to reduce the contact between the permanent magnet 304 and the outside world and to protect it.

[0023] L-shaped plates 309 are fixedly connected to both ends of the wave spring 308. An L-shaped groove 307 is opened on the inner side of the dovetail groove 306. The L-shaped plates 309 and the L-shaped groove 307 are mutually adapted. The L-shaped plates 309 are set inside the L-shaped groove 307 and fixed inside the L-shaped groove 307 to stabilize the position of both ends of the wave spring 308. There are three sets of wave springs 308, which are evenly distributed at both ends and the middle position inside the dovetail groove 306. The middle set of wave springs 308 has five pieces, and the two sets of wave springs 308 at both ends have four pieces. Overall, they play a stabilizing and limiting role for the dovetail cone block 305.

[0024] Six guide plates 311 are arranged in a circumferential array and evenly distributed. The side ends of the guide plates 311 are provided with arc-shaped grooves 312 and embedded grooves 313, which are staggered to achieve uniform force distribution and reduce deviation. An embedded guide post 315 is fixedly connected to one side of the sliding push block 314. The embedded guide post 315 is adapted to the inner side of the embedded groove 313. A spherical groove 31 is formed on one side surface of the sliding push block 314. 6. The inner side of the spherical groove 316 is movably connected with a sliding ball 317. The outer surface of the sliding ball 317 is adapted to the inner side of the arc-shaped groove 312. The embedded groove 313 and the embedded guide post 315 are each provided in two sets, which are laterally distributed to stabilize the movement state of the sliding push block 314. The arc-shaped groove 312 and the sliding ball 317 are each provided in three sets, which are laterally distributed to stabilize the overall movement direction of the sliding push block 314 and avoid movement deviation.

[0025] A dovetail opening 318 is provided on one side of the tapered frame 310. The dovetail opening 318 is located on one side of the guide plate 311. The arc-shaped groove 312 and the inner groove 313 are open on the side near the dovetail opening 318 and closed on the side away from the dovetail opening 318. One end is closed to prevent the sliding push block 314 from sliding out from the end of the guide plate 311 with the arc-shaped groove 312 and the inner groove 313 when the whole device is not in use, according to the setting angle of the guide plate 311 and the cooperation of related components. The other end is open to facilitate the sliding push block 314 moving along the side of the guide plate 311 toward the dovetail opening 318 when the whole device is rotated. The device slides in 18 directions, and utilizes the cooperation between the embedded guide post 315 and the embedded groove 313, as well as the cooperation between the sliding ball 317 and the arc-shaped slide groove 312, to convert the circumferential force during rotation into the inward axial force of the sliding push block 314. This allows the sliding push block 314 to move towards the dovetail opening 318 while one end of the sliding push block 314 is attached to the side end of the dovetail cone block 305. The entire device provides the same stabilizing effect on the dovetail cone block 305 from both ends, thereby stabilizing the permanent magnet 304 in the axial direction and effectively reducing the possibility of axial displacement or detachment during use.

[0026] It is important to note that, in combination Figure 8 The figure shows the actual working condition of the equipment. S1 and S2 are schematic diagrams of the positional changes of the dovetail cone block 305 and the wave spring 308. The equipment can adjust the corresponding position according to the requirements.

[0027] In this embodiment of the invention, when the overall device is in its initial state, i.e., a static state, there is no centrifugal force, the wave spring 308 is in a naturally extended state, and the permanent magnet 304 is suspended on the outside of the rotor core 302 by the cooperation between the dovetail cone 305 and the dovetail groove 306. At this time, the position of the permanent magnet 304 is not fixed. As the overall device starts to rotate and accelerates, as the rotor shaft 301 and the rotor core 302 begin to rotate, the permanent magnet 304 is subjected to a circumferential outward centrifugal force, and the permanent magnet 304 will move a very small distance outward along the circumferential direction. When the permanent magnet 304 moves slightly outward, its sidewall will press against the wave spring 308. When the permanent magnet 304 moves to its limit position, the wave spring 308 exerts a reverse action on the dovetail cone 305. At this time, the permanent magnet 304... When circumferentially locked, displacement in that direction ceases, resulting in a dynamically locked state. Similarly, during initial startup, the sliding push blocks 314 at both ends of the permanent magnet 304, under centrifugal force, convert the outward centrifugal force into an inward driving force along the axial direction through the cooperation between the arc-shaped groove 312 and the sliding ball 317, and the cooperation between the embedded groove 313 and the embedded guide post 315. This causes the sliding push blocks 314 to move towards the center until the end faces of one side of the sliding push blocks 314 are tightly attached to the two end faces of the permanent magnet 304, eliminating axial gaps. After attachment, their rigid contact prevents the permanent magnet 304 from generating any axial displacement, thus stabilizing and protecting the permanent magnet 304 and effectively preventing loosening, detachment, or even flying out, which could lead to serious malfunctions such as motor jamming.

[0028] Please see Figures 1-10 The present invention also provides a technical solution: an energy-saving electric motor, including a mounting base 1, with an electric motor 200 and a twin-screw assembly 400 fixedly connected to the upper end of the mounting base 1, and a synchronous direct-drive twin-screw rotor assembly provided inside the electric motor 200.

[0029] The motor 200 includes a housing frame 201 and a stator core 204. The stator core 204 is fixedly connected to the inner side of the housing frame 201. A stator winding 205 is fixedly connected to the side end of the stator core 204. The rotor assembly 300 is disposed inside the stator core 204 and the stator winding 205.

[0030] An external junction box 202 is fixedly connected to the outer side of the machine frame 201, and a motor front cover 203 is fixedly connected to the front end of the machine frame 201. A bearing groove 208 is provided on one side of both the machine frame 201 and the motor front cover 203. A rotating bearing 209 is provided on the inner side of the bearing groove 208. The inner side of the rotating bearing 209 is fixedly connected to the outer sides of both ends of the rotor shaft 301. The bearing groove 208 is used to stabilize the position of the rotating bearing 209 and the rotor shaft 301 as a whole. The external junction box 202 is electrically connected to an external power source to conveniently meet the power requirements during overall use.

[0031] A motor rear cover 207 is fixedly connected to one side of the machine frame 201. A cooling fan 206 is provided on the inner side of the motor rear cover 207. One side of the cooling fan 206 is fixedly connected to the outer side of one end of the rotor shaft 301. When the rotor shaft 301 rotates, the cooling fan 206 rotates accordingly to cool down the internal components and prevent them from overheating and affecting their use.

[0032] In this embodiment of the invention, the overall device relies on the permanent magnet 304 on the outside of the rotor core 302 to generate a stable inherent magnetic field. After the stator assembly is supplied with three-phase alternating current, it synthesizes a uniformly rotating spatial magnetic field. The two magnetic fields interact with each other to generate electromagnetic torque, which drives the rotor assembly 300 to rotate synchronously, converting electrical energy into mechanical energy.

[0033] Reference Figures 1-10 Specifically, the twin-screw assembly 400 includes a mounting housing 401. A first screw 402 and a second screw 403 are disposed on the inner side of the mounting housing 401. The first screw 402 and the second screw 403 mesh with each other. The first screw 402 is configured with five teeth, and the second screw 403 is configured with six teeth. By utilizing the asymmetrical tooth profile between the first screw 402 and the second screw 403, the contact line trajectory is optimized, transmission loss is reduced, and weight reduction is achieved at the same time.

[0034] In this embodiment of the invention, one end of the first screw 402 is fixedly connected to the output end of the rotor shaft 301, so that the rotor assembly 300 rotates while driving the first screw 402 to rotate synchronously. Then, the meshing connection between the second screw 403 and the first screw 402 drives the second screw 403 to rotate. Finally, the rotational force is output from one end of the second screw 403, which improves the overall transmission efficiency, reduces losses, and reduces the noise generated by gear transmission.

[0035] Specific usage process: Before the synchronous direct-drive twin-screw rotor assembly and energy-saving motor of the present invention are put into operation, the entire device is in a static state, the motor 200 is not yet powered on, there is no centrifugal force, the permanent magnet 304 is hung on the outside of the rotor core 302 by the cooperation of the dovetail cone 305 and the dovetail groove 306, the wave spring 308 is in a naturally extended state, at this time the position of the permanent magnet 304 is not fixed, there is a small degree of freedom of movement. When the motor 200 starts, after the stator assembly is connected to three-phase AC power, the stator core 204 generates a rotating magnetic field. This magnetic field interacts with the inherent magnetic field established by the permanent magnet 304 on the outside of the rotor core 302, generating electromagnetic torque, driving the rotor assembly 300 to start rotating. At the same time, the rotor shaft 301 rotates and drives the cooling fan 206 at its rear end to operate synchronously, forcibly cooling the inside of the motor 200, avoiding the accumulation of temperature rise caused by the large starting current in the early stage of operation, and providing temperature protection for subsequent efficient operation.

[0036] As the rotational speed of the rotor shaft 301 and rotor core 302 increases, the permanent magnet 304 is subjected to centrifugal force in the circumferential direction and begins to displace a very small distance in the circumferential direction. When the permanent magnet 304 moves slightly outward, its sidewall will press the wave spring 308 set in the dovetail groove 306. The wave spring 308 undergoes elastic deformation. When the permanent magnet 304 moves to the limit position, the wave spring 308 generates a reverse force on the dovetail cone 305. At this time, the permanent magnet 304 is circumferentially locked, the circumferential displacement is terminated, and the whole exhibits a stable state of dynamic locking.

[0037] In the axial direction, at the initial stage of startup, the sliding push blocks 314 at both ends of the permanent magnet 304 also begin to move under the action of centrifugal force. The sliding push blocks 314, through the cooperation of the embedded guide post 315 and the embedded groove 313, and the cooperation of the sliding ball 317 and the arc-shaped slide groove 312, convert the circumferential centrifugal force into a driving force for axial inward movement. The sliding push blocks 314 move towards the middle as a whole until the end faces of the two sliding push blocks 314 are tightly attached to the two end faces of the permanent magnet 304, eliminating the axial gap. After the attachment, the rigid contact prevents the permanent magnet 304 from producing any axial displacement, thereby simultaneously achieving the locking of the permanent magnet in both circumferential and axial dimensions.

[0038] Once the permanent magnet 304 is locked, the rotor assembly 300 enters a stable operating state. At this time, the inherent magnetic field established by the permanent magnet 304 is synchronized with the stator rotating magnetic field, and the electromagnetic torque is continuously and stably output, and electrical energy is efficiently converted into mechanical energy.

[0039] The output end of the rotor shaft 301 is directly fixed to one end of the first screw 402, driving the first screw 402 to rotate synchronously. The first screw 402 adopts a five-tooth structure, and the second screw 403 meshing with it adopts a six-tooth structure. The contact line trajectory between the two is optimized through an asymmetrical tooth profile design. When the first screw 402 rotates, it drives the second screw 403 to rotate synchronously in the opposite direction. Finally, the rotational power is output from the output end of the second screw 403, realizing direct drive transmission between the motor 200 and the twin screw assembly 400, which greatly reduces transmission loss and mechanical noise.

[0040] When the motor 200 is powered off and stops, the rotor speed gradually decreases, and the centrifugal force decreases until it disappears. The wave spring 308 returns to its natural extended state, and the sliding push block 314 slides back to its initial position along the guide plate 311 under the influence of gravity or the cooperation of components. The permanent magnet 304 returns to its suspended state. The entire mechanism automatically resets after stopping, preparing for the next start-up without the need for additional manual adjustment or maintenance. The entire mechanism utilizes the centrifugal force generated by the motor 200 as the driving force to achieve a self-locking effect, fundamentally avoiding the risk of magnet loosening due to high temperature and centrifugal force. At the same time, through direct drive transmission and asymmetrical tooth profile design, transmission loss is further reduced while improving reliability, highlighting high efficiency and energy saving.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A synchronous direct-drive twin-screw rotor assembly, characterized in that, Includes rotor assembly (300); The rotor assembly (300) includes a rotor shaft (301) and a rotor core (302). The rotor core (302) is fixedly connected to the outside of the rotor shaft (301). The rotor shaft (301) has a first central axis, the direction of which is set as the axial direction. The rotor core (302) can be driven by the rotor shaft (301) to rotate synchronously around the first central axis in the circumferential direction. A dovetail groove (306) is provided on the outside of the rotor core (302). Six dovetail grooves (306) are provided and are evenly distributed in a circumferential array. A dovetail cone (305) is provided on the inside of the dovetail groove (306). Waveform springs (308) are provided on the outer side of each block (305). The end point of the waveform springs (308) is in contact with the outer side of the dovetail cone block (305). At the same time, the waveform springs (308) provide circumferential limiting effect on the dovetail cone block (305). Conical frames (310) are fixedly connected to both sides of the rotor core (302). The other end of the conical frame (310) is fixedly connected to the outer side of the rotor shaft (301). A guide plate (311) is fixedly connected to the side end of the conical frame (310). A sliding push block (314) is movably connected to the side end of the guide plate (311). The sliding push block (314) provides axial limiting effect on the dovetail cone block (305).

2. The synchronous direct-drive twin-screw rotor assembly according to claim 1, characterized in that: One end of the dovetail cone block (305) is fixedly connected to an arc-shaped sleeve (303), and a permanent magnet (304) is fixedly connected to the inner side of the arc-shaped sleeve (303). The arc-shaped sleeve (303) is located on the outer side of the rotor core (302).

3. A synchronous direct-drive twin-screw rotor assembly according to claim 2, characterized in that: The two ends of the wave spring (308) are fixedly connected to L-shaped plates (309), and the inner side of the dovetail groove (306) is provided with an L-shaped groove (307). The L-shaped plates (309) and the L-shaped groove (307) are mutually adapted to each other, and the L-shaped plates (309) are located on the inner side of the L-shaped groove (307).

4. The synchronous direct-drive twin-screw rotor assembly according to claim 1, characterized in that: The guide plates (311) are arranged in six evenly distributed in a circumferential array. The side ends of the guide plates (311) are provided with arc-shaped sliding grooves (312) and embedded grooves (313). The arc-shaped sliding grooves (312) and embedded grooves (313) are interleaved. An embedded guide post (315) is fixedly connected to one side of the sliding push block (314). The embedded guide post (315) is adapted to the inner side of the embedded groove (313). A spherical groove (316) is provided on one side surface of the sliding push block (314). A sliding ball (317) is movably connected to the inner side of the spherical groove (316). The outer surface of the sliding ball (317) is adapted to the inner side of the arc-shaped sliding groove (312).

5. A synchronous direct-drive twin-screw rotor assembly according to claim 4, characterized in that: The tapered frame (310) has a dovetail opening (318) on one side. The dovetail opening (318) is located on one side of the guide plate (311). The arc-shaped groove (312) and the embedded groove (313) are open on the side near the dovetail opening (318) and closed on the side away from the dovetail opening (318).

6. An energy-saving electric motor, characterized in that, The device includes a mounting base (1), the upper end of which is fixedly connected to a motor (200) and a twin-screw assembly (400), and the inner side of the motor (200) is provided with a synchronous direct-drive twin-screw rotor assembly as described in any one of claims 1 to 5.

7. A synchronous direct-drive twin-screw rotor assembly according to claim 6, characterized in that: The motor (200) includes a housing frame (201) and a stator core (204). The stator core (204) is fixedly connected to the inner side of the housing frame (201). A stator winding (205) is fixedly connected to the side end of the stator core (204). The rotor assembly (300) is disposed inside the stator core (204) and the stator winding (205).

8. An energy-saving electric motor according to claim 7, characterized in that: An external box (202) is fixedly connected to the outer side of the machine frame (201), and a motor front cover (203) is fixedly connected to the front end of the machine frame (201). A bearing groove (208) is provided on one side of both the machine frame (201) and the motor front cover (203). A rotating bearing (209) is provided on the inner side of the bearing groove (208), and the inner side of the rotating bearing (209) is fixedly connected to the outer sides of both ends of the rotor shaft (301).

9. An energy-saving electric motor according to claim 8, characterized in that: A motor rear cover (207) is fixedly connected to one side of the machine frame (201). A cooling fan (206) is provided on the inner side of the motor rear cover (207). One side of the cooling fan (206) is fixedly connected to the outer side of one end of the rotor shaft (301).

10. An energy-saving electric motor according to claim 6, characterized in that: The twin-screw assembly (400) includes a mounting housing (401), on the inner side of which a first screw (402) and a second screw (403) are provided. The first screw (402) and the second screw (403) mesh with each other. The first screw (402) is provided with five teeth, and the second screw (403) is provided with six teeth.

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