Synchronous reluctance motor
By employing a suspension support and high-pressure airflow cooling design, the problems of heat accumulation and dust intrusion inside the synchronous reluctance motor are solved, achieving high-precision and long-life transmission performance.
Patent Information
- Application Number
- CN202511938623.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-22
- Publication Date
- 2026-03-17
AI Technical Summary
During operation, synchronous reluctance motors accumulate internal heat due to iron loss and eddy current loss, which affects transmission accuracy and service life. Furthermore, the bearing support structure is susceptible to dust and impurities, affecting stability and lifespan.
The design employs a suspended support structure and high-pressure airflow for heat dissipation. High-pressure airflow is delivered to both sides of the iron core rotor to form a suspended support, reducing frictional resistance and improving sealing. At the same time, high-speed airflow is used for heat dissipation, and high-frequency signals are used to control the rotor position to reduce losses and noise interference.
It effectively reduces frictional resistance, improves transmission accuracy and sealing, extends service life, and keeps the motor running in low-temperature environments, ensuring efficient transmission.
Smart Images
Figure CN121689626A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of motor technology, and in particular to a synchronous reluctance motor. Background Technology
[0002] Synchronous reluctance motors are AC motors that generate magnetic pull by changing the magnetic reluctance of the rotor at different positions, thereby driving the rotor to rotate. Because synchronous reluctance motors adopt a magnetless design, they effectively avoid dependence on rare earth resources and the risk of demagnetization at high temperatures. At the same time, they combine the low cost of traditional induction motors with the high efficiency of permanent magnet synchronous motors, and have gradually become the core choice and development direction in the field of industrial drives. In synchronous reluctance motors, during operation, the alternating magnetic field generated by the stator winding passes through the iron core rotor, causing iron loss and eddy current loss, which is converted into heat and accumulates inside the synchronous reluctance motor. Prolonged operation in high-temperature environments easily accelerates the aging of the internal structure of the synchronous reluctance motor, severely affecting its transmission accuracy and service life. Furthermore, in existing synchronous reluctance motors, the iron core rotor is often supported by bearings and placed inside the stator winding. However, due to the relatively poor sealing of the bearings, dust and other impurities easily enter during long-term use, accelerating the wear of its internal structure and further affecting the transmission accuracy, service life, stability, and reliability of the synchronous reluctance motor.
[0003] Therefore, there is an urgent need for a transmission structure for synchronous reluctance motors to solve the defects of existing synchronous reluctance motors in actual operation. Summary of the Invention
[0004] This application proposes a synchronous reluctance motor that effectively dissipates heat, preventing excessive internal temperature. This results in higher transmission accuracy and a longer service life for the synchronous reluctance motor. The solution addresses the problem that during operation, when the alternating magnetic field generated by the stator winding passes through the iron core rotor, it causes iron loss and eddy current loss, which are converted into heat and accumulate inside the synchronous reluctance motor. Prolonged operation in high-temperature environments easily accelerates the aging of the internal structure of the synchronous reluctance motor, thus severely affecting its transmission accuracy and service life.
[0005] To achieve the above objectives, this application adopts the following technical solution: A synchronous reluctance motor includes a housing. Several sets of slots are formed in the inner cavity of the housing, and coils are arranged inside the slots to form stator windings. An iron core rotor is movably sleeved inside the housing. A set of transmission components is provided at both ends of the housing to confine the iron core rotor within the inner cavity of the housing. Simultaneously, a linkage shaft with both ends extending to the outside of the two sets of transmission components is fixedly installed inside the iron core rotor. When alternating current is applied to the coils on the housing, an alternating magnetic field is generated, thereby driving the iron core rotor and its linkage shafts to rotate. The transmission components include a fixed module fixedly installed on the side end face of the housing. The outer end face of the fixed module has a concave slot with a conical structure. The outer end of the fixed module is elastically connected to a movable module via an elastic element, and the inner end face of the movable module has a slot that cooperates with the concave slot. The convex locking block, when the inner end face of the movable module is subjected to force, can move outward and compress the elastic element, thereby forming a set of flow gaps between the concave locking groove and the convex locking block. The inner end of the convex locking block protrudes from the end face of the fixed module and cooperates with the tapered groove opened on the side end face of the iron core rotor. The other end of the linkage shaft is provided with a main vent hole and connected to the external high-pressure airflow pipeline. At the same time, a groove is opened inside the iron core rotor and connected to the main vent hole, so that the high-pressure airflow entering the main vent hole can be transported to both sides of the iron core rotor through the groove, and force the movable module to move outward, forming a set of gaps for high-pressure gas flow between the concave locking groove and the convex locking block, and forming a floating support for the iron core rotor. Compared with the bearing support, the floating support effectively reduces the frictional resistance of the iron core rotor when rotating at high speed, and at the same time effectively improves its sealing performance for the outer shell, making it difficult for external dust and other impurities to enter.
[0006] Furthermore, the fixed module has several sets of through holes arranged in a ring array, and several sets of straight slot holes arranged in a ring array and corresponding to the through holes are opened inside the outer shell. A vertical hole is opened in the middle of the outer surface of the outer shell and connected to the straight slot holes. When the high-speed airflow passes through the gap formed by the concave slot and the convex block, under the action of high flow velocity and low pressure, the heat generated by the coil and the iron core rotor on the outer shell when rotating at high speed can actively flow to its two end faces and be carried away by the high-speed airflow to dissipate heat from the synchronous reluctance motor, so that it can operate in a low temperature environment for a long time.
[0007] Furthermore, the outer end of the fixed module is elastically connected to the movable module through an elastic element, and an anti-loosening nut is threadedly connected to the outer end of the elastic element to adjust its elasticity in the initial state, thereby adjusting the maximum gap that can be formed by the concave groove and the convex block, and adjusting the suspension support force generated by the high-speed airflow on the iron core rotor by regulating the flow rate, so as to effectively overcome the centrifugal force of the iron core rotor when rotating at high speed, and enable it to maintain high transmission accuracy.
[0008] Furthermore, the center line of the salient pole on the iron core rotor of the synchronous reluctance motor is taken as the d-axis, and a high-frequency square wave or pseudo-random signal is injected on the d-axis. The salient pole characteristics of the iron core rotor are used to generate an asymmetrical current response. Then, the high-frequency current component is separated by a bandpass filter, and the envelope phase difference is calculated to estimate the position. At the same time, the injection amplitude is adaptively adjusted to reduce losses and suppress noise interference, thereby determining the accurate position of the iron core rotor at any time point and ensuring the effective start-up of the synchronous reluctance motor.
[0009] Furthermore, the diameter of the trajectory circle formed by the near endpoints of the inner wall of the groove is equal to the outer diameter of the linkage shaft, so that part of the high-speed gas flowing in the groove is discharged through the assembly gap between the transmission component and the linkage shaft, thereby effectively reducing the frictional resistance generated between the linkage shaft and the transmission component when rotating at high speed.
[0010] The beneficial effects of this invention are as follows: 1. The synchronous reluctance motor provided in this application, with the arrangement of the transmission components and their structures, allows the high-pressure airflow entering the main vent to be transported to both ends of the iron core rotor through the groove, forcing the movable module to move outward, forming a gap between the concave groove and the convex block for high-pressure gas flow, and providing a floating support for the iron core rotor. Compared with bearing support, the floating support effectively reduces the frictional resistance of the iron core rotor when rotating at high speed, and at the same time effectively improves its sealing performance to the outer casing, making it difficult for external dust and other impurities to enter, thereby effectively improving the transmission accuracy and service life of the synchronous reluctance motor.
[0011] 2. The synchronous reluctance motor provided in this application, with its straight slot and connecting hole configuration, allows the heat generated by the coils on the outer casing and the iron core rotor during high-speed rotation to actively flow to both sides of the end face when high-speed airflow passes through the gap formed by the concave slot and the convex block. This heat is carried away by the high-speed airflow to dissipate heat from the synchronous reluctance motor, enabling it to operate in a lower temperature environment for a long time. This further improves the transmission accuracy and service life of the synchronous reluctance motor. Attached Figure Description
[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a front view of the structure of the present invention; Figure 3 This is a schematic diagram of the transmission component of the present invention; Figure 4 This is a schematic diagram of the structure of the fixing module of the present invention; Figure 5 This is a schematic diagram of the structure of the active module of the present invention; Figure 6 The structure of this invention Figure 2 Sectional view at point AA.
[0013] In the diagram: 1-outer shell, 2-iron core rotor, 3-transmission assembly, 4-linkage shaft, 5-straight slot hole, 6-groove, 7-main vent hole, 8-fixed module, 9-movable module, 10-elastic element, 11-anti-loosening nut, 12-concave groove, 13-connecting hole, 14-protruding block. Detailed Implementation
[0014] 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.
[0015] like Figure 1 As shown, a synchronous reluctance motor includes a housing 1. Several sets of slots are formed in the inner cavity of the housing 1, and coils are installed inside these slots to form stator windings. An iron core rotor 2 is movably sleeved inside the housing 1. A set of transmission components 3 are respectively provided at both ends of the housing 1 to confine the iron core rotor 2 within the inner cavity of the housing 1. Simultaneously, a linkage shaft 4, with its two ends extending to the outside of the two sets of transmission components 3, is fixedly installed inside the iron core rotor 2. When alternating current is applied to the coils on the housing 1, an alternating magnetic field is generated, thereby driving the iron core rotor 2 and its linkage shaft 4 to rotate. Figures 2-4As shown, the transmission assembly 3 includes a fixed module 8 fixedly mounted on the side end face of the outer casing 1. The outer end face of the fixed module 8 is provided with a concave groove 12 with a conical structure. The outer end of the fixed module 8 is elastically connected to a movable module 9 through an elastic element 10. The inner end face of the movable module 9 is provided with a convex block 14 that cooperates with the concave groove 12. When the inner end face of the movable module 9 is subjected to force, it can move outward and compress the elastic element 10, thereby forming a flow gap between the concave groove 12 and the convex block 14. The inner end of the convex block 14 protrudes from the end face of the fixed module 8 and cooperates with the conical groove opened on the side end face of the iron core rotor 2. Figure 5 , Figure 6 As shown, the other end of the linkage shaft 4 is provided with a main vent hole 7 and connected to an external high-pressure airflow pipeline. At the same time, a groove 6 connected to the main vent hole 7 is provided inside the iron core rotor 2. This allows the high-pressure airflow entering the main vent hole 7 to be transported to both ends of the iron core rotor 2 through the groove 6, and forces the movable module 9 to move outward. A gap for high-pressure gas to flow is formed between the concave groove 12 and the convex block 14, and a floating support is formed for the iron core rotor 2. Compared with the bearing support, the floating support effectively reduces the frictional resistance of the iron core rotor 2 when rotating at high speed, and at the same time effectively improves its sealing performance for the outer shell 1, making it difficult for external dust and other impurities to enter.
[0016] like Figure 1 , Figure 3 as well as Figure 6 As shown, in this technical solution, the fixed module 8 has several sets of through holes 13 arranged in a ring array, and the outer shell 1 has several sets of straight slot holes 5 arranged in a ring array and corresponding to the through holes 13. A vertical hole is opened in the middle of the outer surface of the outer shell 1 and connected to the straight slot holes 5. When the high-speed airflow passes through the gap formed by the concave slot 12 and the convex slot 14, under the action of high flow velocity and low pressure, the heat generated by the coil and the iron core rotor 2 on the outer shell 1 when rotating at high speed can actively flow to its two end faces and be carried away by the high-speed airflow to dissipate heat from the synchronous reluctance motor, so that it can operate in a low temperature environment for a long time.
[0017] like Figure 1 , Figure 2As shown, in this technical solution, the outer end of the fixed module 8 is elastically connected to the movable module 9 through the elastic element 10, and the outer end of the elastic element 10 is threaded with an anti-loosening nut 11 to adjust its elasticity in the initial state, thereby adjusting the maximum gap that can be formed by the concave groove 12 and the convex block 14, and adjusting the flow rate of the high-speed airflow to adjust the suspension support force generated by it on the iron core rotor 2, so as to effectively overcome the centrifugal force of the iron core rotor 2 when rotating at high speed, and enable it to maintain high transmission accuracy.
[0018] In this technical solution, the center line of the salient pole (i.e. the minimum magnetic reluctance) on the iron core rotor 2 of the synchronous reluctance motor is taken as the d-axis, and a high-frequency square wave or pseudo-random signal is injected on the d-axis. The salient pole characteristics of the iron core rotor 2 are used to generate an asymmetrical current response. Then, the high-frequency current component is separated by a bandpass filter, and the envelope phase difference is calculated to estimate the position. At the same time, the injection amplitude is adaptively adjusted to reduce losses and suppress noise interference, thereby determining the accurate position of the iron core rotor 2 at any time point and ensuring the effective start-up of the synchronous reluctance motor.
[0019] In this technical solution, the diameter of the trajectory circle formed by the near endpoints of the inner wall of the groove 6 is equal to the outer diameter of the linkage shaft 4, so that part of the high-speed gas flowing in the groove 6 is discharged through the assembly gap between the transmission component 3 and the linkage shaft 4, thereby effectively reducing the frictional resistance generated between the linkage shaft 4 and the transmission component 3 when rotating at high speed.
[0020] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A synchronous reluctance motor, comprising an outer housing (1), an iron core rotor (2) movably sleeved in the inner part of the outer housing (1), and a set of transmission assemblies (3) respectively arranged at the two ends of the outer housing (1), and a linkage shaft (4) fixedly installed in the inner part of the iron core rotor (2) and extending to the outside of the two sets of transmission assemblies (3) respectively, characterized in that: the transmission assembly (3) comprises a fixed module (8) fixedly installed on the side end face of the outer housing (1), the outer side end face of the fixed module (8) is provided with a concave clamping groove (12) in a conical structure, the outer side end of the fixed module (8) is elastically connected with a movable module (9) through an elastic member (10), and the inner side end face of the movable module (9) is provided with an external convex clamping block (14) matched with the concave clamping groove (12), the inner side end of the external convex clamping block (14) protrudes from the end face of the fixed module (8) and is matched with a conical groove opened on the side end face of the iron core rotor (2), the other end of the linkage shaft (4) is provided with a main air passage (7) and is connected in communication with the external high-pressure gas pipeline, and a groove (6) in communication with the main air passage (7) is opened in the inner part of the iron core rotor (2).
2. The synchronous reluctance machine of claim 1, wherein, The inner part of the fixed module (8) is provided with a communication hole (13), a straight slot hole (5) in communication with the communication hole (13) is opened in the inner part of the outer housing (1), and a vertical hole in communication with the straight slot hole (5) is opened in the middle part of the outer surface of the outer housing (1).
3. The synchronous reluctance machine of claim 2, wherein, The outer side end of the fixed module (8) is elastically connected with the movable module (9) through the elastic member (10), and a lock nut (11) is threadedly connected to the outer side end of the elastic member (10) to control the elasticity of the elastic member (10) in the initial state.
4. The synchronous reluctance machine of claim 3, wherein, The center line of the salient pole on the iron core rotor (2) of the synchronous reluctance motor is taken as the d-axis, a high-frequency square wave or pseudo-random signal is injected on the d-axis, an asymmetric current response is generated by the salient pole characteristics of the iron core rotor (2), a high-frequency current component is separated through a band-pass filter, an envelope phase difference is calculated to estimate the position, and the injection amplitude is adaptively adjusted to reduce the loss and suppress noise interference.
5. The synchronous reluctance machine of claim 1, wherein, The diameter of the track circle formed by the proximal end points of the inner wall of the groove (6) is equal to the outer diameter of the linkage shaft (4), so that part of the high-speed gas flowing in the groove (6) is discharged through the assembly gap between the transmission assembly (3) and the linkage shaft (4).