Mechanical variable flux machine based on an internal tangential rotor

Abstract

The application relates to the technical field of electric machines, and discloses a mechanical variable magnetic flux electric machine based on an embedded tangential rotor, which comprises a stator core and a rotor core, the rotor core is connected with an end cover, further comprises permanent magnets, a rotating shaft and a magnetic adjusting assembly; the permanent magnets are embedded in the rotor core and are arranged in a circumferential array; the rotating shaft is arranged in the middle of the rotor core and is coaxially connected with the rotor core for rotation; the magnetic adjusting assembly comprises a magnetic conducting ring and a torsional elastic element; the magnetic conducting ring is arranged between the rotating shaft and the rotor core, is fixedly connected with the rotating shaft, and is protrusively provided with a magnetic leakage block on the outer side wall of the rotor core; the magnetic leakage block is used for rotating relative to the permanent magnet to generate and adjust a magnetic leakage path; the two ends of the torsional elastic element are fixedly connected with the end cover and the rotating shaft respectively; the magnetic leakage block and the permanent magnet can be adjusted in relative position through the magnetic conducting ring and the torsional elastic element, the magnetic leakage path can be adjusted, and the continuous automatic adjustment of the air gap magnetic flux can be realized.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a mechanical flux-changing motor based on a built-in tangential rotor. Background Technology

[0002] The high power density, high efficiency, and high power factor of permanent magnet synchronous motors have led to their widespread application in aerospace, electric vehicles, and underwater propulsion. However, in electric vehicles, the back electromotive force (EMF) increases with speed. When the back EMF approaches the terminal voltage, the speed cannot be increased further to ensure safe and stable operation, thus limiting the motor's speed range. Field weakening control effectively solves this problem; by reducing the magnetic flux at high speeds, the back EMF is reduced, thereby expanding the speed adjustment range.

[0003] However, compared to electrically excited synchronous motors, the magnetic field of permanent magnet synchronous motors generally remains constant and is difficult to adjust. Currently, methods for adjusting the magnetic field mainly include memory motor adjustment, leakage flux adjustment, and mechanical flux modulation. Memory motor adjustment changes the magnetization state of low-coercivity permanent magnets by adjusting the d-axis current, but this method increases energy consumption and the risk of permanent magnet demagnetization. Leakage flux adjustment adjusts the magnetic reluctance by changing the magnetic circuit saturation state, thereby adjusting the magnetic flux; its field weakening capability is limited, resulting in a limited expansion of the speed adjustment range. Existing mechanical flux modulation methods often require adding additional mechanical structures to the outside of the motor, leading to increased motor size and decreased power density. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a mechanical flux-changing motor based on a built-in tangential rotor, which solves the technical problem that motors in the prior art are difficult to achieve continuous and automatic adjustment of motor flux while maintaining power density.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: The present invention provides a mechanical variable flux motor based on a built-in tangential rotor, including a stator core and a rotor core, wherein the rotor core is axially fixedly connected with an end cap, and also includes a permanent magnet, a rotating shaft and a magnetic adjustment assembly; The permanent magnet is embedded between two sector-shaped portions of the rotor core, and a plurality of the permanent magnets are arranged in a circumferential array. The rotating shaft passes through the middle of the rotor core, and the rotating shaft is rotatably connected to the rotor core on the same axis. The rotor is used to connect to an external load. The magnetic adjustment assembly includes a magnetic guide ring, a magnetic leakage block, and a torsional elastic element. The magnetic guide ring is coaxially disposed between the rotating shaft and the rotor core, and is fixedly connected to the rotating shaft. The magnetic leakage block protrudes from the outer wall of the magnetic guide ring facing the rotor core and is used to rotate relative to the permanent magnet to generate and adjust the magnetic leakage path. The two ends of the torsional elastic element are respectively fixedly connected to the end cap and the rotating shaft.

[0006] In some embodiments, the width of the magnetic leakage block is the same as the width of the corresponding permanent magnet, and multiple magnetic leakage blocks are provided for multiple permanent magnets.

[0007] In some embodiments, when the torsional elastic element is in its initial, untorsed state, the plurality of leakage magnetic blocks are alternately arranged with the plurality of permanent magnets.

[0008] In some embodiments, a limiting plate is provided on the end face of the end cap facing the rotor core, the limiting plate being disposed between two adjacent leakage magnetic blocks, and the limiting plate being used to limit the rotation range of the magnetic ring relative to the rotor core.

[0009] In some embodiments, the end cap includes a front end cap and a rear end cap, the front end cap and the rear end cap respectively abutting against two end faces in the direction of the rotor core axis; a locking screw is provided between the front end cap and the rear end cap, the locking screw passes through the rotor core, and the two ends of the locking screw are respectively fixedly connected to the front end cap and the rear end cap; The torsional elastic element is provided between the rotating shaft and the front end cover and / or the rear end cover.

[0010] In some embodiments, multiple limiting plates are arranged circumferentially around the rotor core axis, and both the front end cover and the rear end cover are provided with the limiting plates.

[0011] In some embodiments, bearings are provided between the rotating shaft and both the front end cover and the rear end cover.

[0012] In some embodiments, the torsional elastic element includes a helical torsion spring, which is sleeved on the outside of the rotating shaft and located between the rotating shaft and the magnetic ring. One end of the helical torsion spring is fixedly connected to the front end cover or the rear end cover, and the other end of the helical torsion spring is fixedly connected to the rotating shaft.

[0013] In some embodiments, the torsional elastic element includes a planar spiral spring, the outer end of which is fixedly connected to the front end cover or the rear end cover, and the inner end of which is fixedly connected to the rotating shaft.

[0014] In some embodiments, the rotating shaft is provided with an annular baffle, one end of the magnetic ring is provided with a positioning block, and the annular baffle is provided with a positioning hole corresponding to the positioning block.

[0015] Compared with the prior art, the mechanical flux-changing motor based on a built-in tangential rotor provided in this embodiment of the invention has the following advantages: In this embodiment, a rotating shaft is coaxially rotatable in the middle of the rotor core, and a magnetic ring is placed between the rotating shaft and the rotor core. A permanent magnet is embedded inside the rotor core, and the permanent magnet corresponds to the leakage magnetic block on the magnetic ring. The rotating shaft is connected to the rotor core through a torsional elastic element. When the rotor core rotates, the torsional elastic element drives the rotating shaft and the magnetic ring on it to rotate together. Due to the rotational speed and external load, the torsional elastic element will twist, causing relative rotation between the rotating shaft and the rotor core. Relative rotation will also occur between the leakage magnetic block and the corresponding permanent magnet, resulting in misalignment between the leakage magnetic block and the permanent magnet. This creates and adjusts the leakage magnetic path. The leakage magnetic effect of the leakage magnetic path varies depending on the relative rotation angle between the rotating shaft and the rotor core. This allows for continuous and automatic adjustment of the air gap magnetic flux between the stator core and the rotor core, ultimately reducing the back electromotive force and expanding the adjustable speed range. Furthermore, in this embodiment, the magnetic ring and torsional elastic element of the magnetic adjustment component are both located inside the motor rotor core, so the overall volume of the motor does not increase and the power density of the motor does not decrease. Attached Figure Description

[0016] Figure 1 This is an exploded view of one embodiment of the present invention; Figure 2 This is a cross-sectional view of an embodiment of the present invention; Figure 3 This is a cross-sectional view of another embodiment of the present invention; Figure 4 This is a schematic diagram of the adjusted magnetic flux path according to the present invention; Figure 5 This is a schematic diagram of the magnetic flux path in the initial state of the present invention.

[0017] In the diagram: 1. Stator core; 2. Rotor core; 3. End cap; 31. Front end cap; 32. Rear end cap; 33. Limiting plate; 34. Locking screw; 35. Bearing; 4. Permanent magnet; 5. Rotating shaft; 51. Annular baffle; 52. Positioning hole; 6. Magnetic adjustment component; 61. Magnetic guide ring; 611. Positioning block; 62. Torsional elastic element; 621. Helical torsion spring; 622. Planar spiral spring; 63. Magnetic leakage block. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description and accompanying drawings of this application are used to distinguish different objects, and are not used to describe a particular order, primary or secondary relationship, or importance of components.

[0020] It should be noted that, unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention. Furthermore, the use of terms such as "horizontal," "vertical," and "suspended" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, positioned in a specific orientation such as "horizontal," "vertical," or "suspended," can have an error / deviation of ±10% relative to that orientation, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still fulfill its function in the present invention.

[0021] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0024] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0025] To address the technical problem that existing mechanical flux-changing schemes cannot achieve continuous automatic adjustment of motor flux while maintaining motor power density, this invention provides a mechanical flux-changing motor based on a built-in tangential rotor, which can achieve continuous automatic adjustment of motor flux without reducing motor power.

[0026] like Figures 1 to 3 As shown, a preferred embodiment of the present invention provides a mechanical flux-changing motor based on a built-in tangential rotor, which includes a stator core 1 and a rotor core 2. The rotor core 2 is axially fixedly connected to an end cover 3, and also includes a permanent magnet 4, a rotating shaft 5, and a magnetic adjustment component 6.

[0027] Permanent magnet 4 is embedded between two sector-shaped portions of rotor core 2, and multiple permanent magnets 4 are arranged in a circumferential array. The rotating shaft 5 is inserted through the middle of the rotor core 2. The rotating shaft 5 is coaxially rotatably connected to the rotor core 2. The rotating shaft 5 is used to connect the external load. The magnetic adjustment assembly 6 includes a magnetic guide ring 61 and a torsional elastic element 62. The magnetic guide ring 61 is coaxially disposed between the rotating shaft 5 and the rotor core 2. The magnetic guide ring 61 is fixedly connected to the rotating shaft 5. A leakage magnetic block 63 is provided on the outer side wall of the magnetic guide ring 61 facing the rotor core 2. The leakage magnetic block 63 is used to rotate relative to the permanent magnet 4 to generate and adjust the leakage magnetic path. The two ends of the torsional elastic element 62 are fixedly connected to the end cap 3 and the rotating shaft 5, respectively.

[0028] Specifically, in this embodiment, the rotor core 2 is coaxially disposed inside the stator core 1, and a rotating shaft 5 is coaxially rotatably connected to the middle of the rotor core 2. The rotating shaft 5 is used to connect to an external load to output power. The end cover 3 is disposed on one end face of the rotor core 2 along its axial direction and is fixedly fitted to the rotor core 2. The end cover 3 can rotate with the rotor core 2. The permanent magnet 4 preferably adopts a plate-like structure and is embedded in the gaps between the sector sections of the rotor core 2. In a preferred embodiment, a permanent magnet 4 is embedded in each gap between the sector sections of the rotor core 2. The permanent magnet 4 is circumferentially magnetized. At this time, the magnetic flux in the air gap between the rotor core 2 and the stator core 1 is provided by two adjacent permanent magnets 4, which helps to increase the air gap magnetic flux and thus improve the power density.

[0029] Based on the above structure, this embodiment also provides a magnetic guide ring 61 between the rotating shaft 5 and the rotor core 2. The magnetic guide ring 61 is sleeved on the outer wall of the rotating shaft 5 and fixedly connected to the rotating shaft 5, that is, the magnetic guide ring 61 can rotate synchronously with the rotating shaft 5, and the number of protruding magnetic leakage blocks 63 on the magnetic guide ring 61 corresponds to the number of permanent magnets 4. In actual use, due to different external loads connected to the rotating shaft 5, the torsional deformation of the torsional elastic element 62 is also different, which makes the rotation angle of the rotating shaft 5 relative to the rotor core 2 different, that is, the deflection angle between the magnetic guide ring 61 and the permanent magnet 4 will also be different. Among them, when the center line of the magnetic leakage block 63 coincides with the center line of the permanent magnet 4, the magnetic leakage block 63 and the permanent magnet 4 are aligned, and the deflection angle between the magnetic leakage block 63 and the permanent magnet 4 is 0, then the reference... Figure 4 At this point, the magnetic flux path is path A, and the air gap magnetic flux is at its maximum. However, when the leakage magnetic block 63 is not aligned with the permanent magnet 4, and a certain deflection angle occurs between the leakage magnetic block 63 and the permanent magnet 4, the reference... Figure 5The magnetic flux leakage block 63 provides a magnetic flux leakage path B. Due to the air gap in path A, the magnetic reluctance of path A is greater than that of path B, thus path B produces a magnetic flux leakage effect, reducing the magnetic flux in the air gap. However, because the width of the magnetic flux leakage block 63 is limited, it will saturate when the magnetic flux passing through is large, thereby increasing the magnetic reluctance of path B accordingly. Therefore, path B does not "divert" all the magnetic flux. As the magnetic flux leakage angle between the center line of the magnetic flux leakage block 63 and the center line of the permanent magnet 4 increases, the width of the magnetic flux leakage block 63 that provides the magnetic flux leakage effect increases, the magnetic flux that can pass through increases, and the magnetic flux in the air gap decreases accordingly, resulting in a better magnetic weakening effect. When the magnetic flux leakage angle increases to the point that the magnetic flux leakage block 63 and the permanent magnet 4 are completely misaligned, that is... Figure 5 When the air gap magnetic flux reaches its minimum, the air gap magnetic flux can be adjusted by changing the angle between the center of the leakage magnetic block 63 and the center of the permanent magnet 4, thereby adjusting the back electromotive force.

[0030] Understandably, the greater the external load torque, the greater the deformation of the torsional elastic element 62 is required to maintain the balance between the shaft 5 and the rotor core 2. In this case, if the deflection angle between the leakage magnetic block 63 and the permanent magnet 4 is smaller, the air gap flux will be larger, thus providing a greater power density. Conversely, when the external load torque is smaller, the torsional elastic element 62 does not require much deformation to achieve balance. In this case, the deflection angle between the leakage magnetic block 63 and the permanent magnet 4 is larger, resulting in a smaller air gap flux, a smaller back electromotive force, and a larger adjustable speed range.

[0031] It should also be noted that in this embodiment, the magnetic ring 61 and the torsional elastic element 62 are both set between the rotor core 2 and the shaft 5, that is, they are set inside the motor, and no parts are set outside the motor. This means that when the motor meets the continuous automatic adjustment of the air gap flux, its power density does not decrease significantly or noticeably.

[0032] It is understood that in some embodiments, the stator core 1 is also provided with an outer shell structure, and the magnetic ring 61 is made of magnetically conductive materials such as silicon steel sheets, and the magnetic ring 61 is also coaxially arranged with the rotor core 2.

[0033] In one embodiment, the width of the magnetic leakage block 63 is the same as the width of the corresponding permanent magnet 4, and multiple magnetic leakage blocks are provided for multiple permanent magnets 4.

[0034] Specifically, in this embodiment, a permanent magnet 4 is embedded between each sector of the rotor core 2. The number and size of the permanent magnets 4 vary depending on the motor size and requirements. The number of leakage magnetic blocks 63 corresponds to the number of permanent magnets 4, thus providing multiple leakage magnetic paths, making the motor's operation more stable and reducing the back electromotive force. The leakage magnetic blocks 63 are also made of magnetically conductive materials such as silicon steel sheets. The width of the leakage magnetic blocks 63 is the same as the width of the corresponding permanent magnet 4, ensuring that when aligned with the corresponding permanent magnet 4, the side of the leakage magnetic blocks 63 is flush with the side of the corresponding permanent magnet 4. This results in a larger air gap magnetic flux and more stable motor operation.

[0035] In one embodiment, when the torsional elastic element 62 is in its untorsed initial state, a plurality of magnetic leakage blocks 63 are alternately arranged with a plurality of permanent magnets 4.

[0036] Specifically, in this embodiment, in the initial state of the motor, the torsion unit does not twist, and the center line of the leakage magnetic block 63 is located in the middle of the center lines of two adjacent permanent magnets 4. That is, the leakage magnetic block 63 and the permanent magnets 4 are staggered. In this state, the deflection angle between the leakage magnetic block 63 and the corresponding permanent magnet 4 reaches its maximum. If the position of the leakage magnetic block 63 shifts, the leakage magnetic block 63 will pair with another adjacent and closer permanent magnet 4 and form a leakage magnetic path, which will cause the magnetic flux passing through the leakage magnetic path to decrease. When the leakage magnetic block 63 rotates relative to the center line of a permanent magnet 4, the magnetic flux that can be leaked by the leakage magnetic path is the minimum, and the air gap magnetic flux is the maximum.

[0037] In one embodiment, a limiting plate 33 is provided on the end face of the end cap 3 facing the rotor core 2. The limiting plate 33 is disposed between two adjacent leakage magnetic blocks 63. The limiting plate 33 is used to limit the rotation range of the magnetic ring 61 relative to the rotor core 2.

[0038] Specifically, in this embodiment, four limiting plates 33 are arranged around the central axis of the end cover 3, which can more stably limit the rotation range of the magnetic ring 61, so that the leakage magnetic block 63 can correspond one-to-one with the permanent magnet 4, avoiding misalignment of the leakage magnetic block 63 with other adjacent permanent magnets 4 during relative rotation, which would cause changes in the leakage magnetic path beyond the design, and ensure the stability and continuity of magnetic flux adjustment.

[0039] In one embodiment, the end cover 3 includes a front cover 31 and a rear cover 32, the front cover 31 and the rear cover 32 respectively abut against two end faces in the axial direction of the rotor core 2; a locking screw 34 is provided between the front cover 31 and the rear cover 32, the locking screw 34 passes through the rotor core 2, and the two ends of the locking screw 34 are respectively fixedly connected to the front cover 31 and the rear cover 32. A torsional elastic element 62 is provided between the rotating shaft 5 and the front cover 31 and / or the rear cover 32.

[0040] Specifically, the front cover 31 and the rear cover 32 are respectively located on both sides of the rotor core 2 in the axial direction, which can effectively seal and protect the internal components of the rotor core 2 and prevent the components from falling out. In this embodiment, the front cover 31, the rotor core 2 and the rear cover 32 are fixedly connected by locking screws 34, thereby realizing the synchronous rotation of the front cover 31, the rotor core 2 and the rear cover 32. Based on this, the end of the torsional elastic element 62 is fixedly connected to the rotor core 2 through the front cover 31 or the rear cover 32, and the other end of the torsional elastic element 62 is fixedly connected to the rotating shaft 5. Thus, when the rotor core 2 rotates, the rotating shaft 5 will be driven to rotate by the deformation of the torsional elastic element 62. When the external load torque is large, the deformation of the torsional elastic element 62 will also be large, and when the external load torque is small, the deformation of the torsional elastic element 62 will also be small. At this time, the angle between the leakage magnetic block 63 and the permanent magnet 4 is also large, the magnetic flux leaked by the leakage magnetic path is also large, the air gap magnetic flux is small, and the back electromotive force is also small. At this time, the speed regulation range of the motor is also larger, which meets the requirements of low load torque and high speed.

[0041] In some alternative embodiments, only one torsional elastic element 62 may be provided. One end of the torsional elastic element 62 may be connected to the front cover 31 or the rear cover 32, and the other end may be connected to the rotating shaft 5. In another embodiment, two torsional elastic elements 62 are symmetrically provided. One end of each of these two torsional elastic elements 62 is connected to the front cover 31 and the rear cover 32, respectively, and the other end is connected to the rotating shaft 5. This allows for a more stable rotation of the rotating shaft 5, making the motor operation smoother and more reliable.

[0042] Furthermore, multiple limiting plates 33 are arranged circumferentially around the axis of the rotor core 2, and both the front cover 31 and the rear cover 32 are provided with limiting plates 33.

[0043] Specifically, in this embodiment, the end cover 3 includes a front cover 31 and a rear cover 32. Considering the stability of the rotating shaft 5 during operation, a limiting plate 33 is provided on both the front cover 31 and the end cover 3, thereby more stably limiting the rotation range of the rotating shaft 5 relative to the rotor core 2 and avoiding uneven force on the rotating shaft 5. In a preferred embodiment, the limiting plates 33 on the front cover 31 and the rear cover 32 are correspondingly provided, while in some alternative embodiments, the limiting plates 33 on the front cover 31 and the rear cover 32 can be staggered, thereby more comprehensively limiting the rotation angle of the rotating shaft 5 relative to the rotor core 2.

[0044] In one embodiment, bearings 35 are provided between the rotating shaft 5 and the front cover 31 and the rear cover 32.

[0045] Specifically, in this embodiment, the bearing 35 reduces friction between the shaft 5 and the front cover 31 and the rear cover 32, thereby improving output efficiency and extending the service life of the entire motor. The inner ring of the bearing 35 is connected to the shaft 5, while the outer ring is connected to either the front cover 31 or the rear cover 32.

[0046] In one embodiment, the torsional elastic element 62 includes a helical torsion spring 621, which is sleeved on the outside of the rotating shaft 5 and located between the rotating shaft 5 and the magnetic ring 61. One end of the helical torsion spring 621 is fixedly connected to the front end cover 31 or the rear end cover 32, and the other end of the helical torsion spring 621 is fixedly connected to the rotating shaft 5.

[0047] Specifically, in this embodiment, the torsional elastic element 62 adopts a helical torsion spring 621, which is sleeved on the outside of the rotating shaft 5. When the rotor core 2 rotates, it drives the front end cover 31 and the rear end cover 32 to rotate, thereby driving the helical torsion spring 621 to torsion deformation, and then driving the rotating shaft 5 to rotate to output power.

[0048] In another embodiment, the torsional elastic element 62 includes a planar spiral spring 622, with the outer end of the planar spiral spring 622 fixedly connected to the front end cover 31 or the rear end cover 32, and the inner end of the planar spiral spring 622 fixedly connected to the rotating shaft 5.

[0049] Specifically, in this embodiment, the torsional elastic element 62 uses a planar spiral spring 622, which can also transmit torque. In this embodiment, the planar spiral spring 622 can be set at the original location of the bearing 35 to replace the original spiral torsion spring 621 and bearing 35, or it can be set separately to replace the spiral torsion spring 621. Its magnetic flux adjustment principle is the same as the above principle, and will not be described again here.

[0050] In one embodiment, the rotating shaft 5 is provided with an annular baffle 51, and one end of the magnetic ring 61 is provided with a positioning block 611. The annular baffle 51 is provided with a positioning hole 52 corresponding to the positioning block 611.

[0051] Specifically, the rotating shaft 5 and the magnetic ring 61 can be connected and fixed in multiple directions. In this embodiment, a baffle is provided on the rotating shaft 5, and multiple positioning holes 52 are provided on the baffle. The magnetic ring 61 is provided with positioning blocks 611 corresponding to the positioning holes 52. By inserting the positioning blocks 611 into the positioning holes 52, the magnetic ring 61 can be connected to the rotating shaft 5, so that the magnetic ring 61 can rotate synchronously with the rotating shaft 5. Furthermore, in this solution, one end of the helical torsion spring 621 is fixedly connected to the baffle to achieve a fixed connection with the rotating shaft 5, while its other end is fixedly connected to the front cover 31 or the rear cover 32 according to the position of the annular baffle 51.

[0052] It is understandable that the positioning hole 52 can be set on the magnetic ring 61, while the positioning block 611 is set on the annular baffle 51.

[0053] In another embodiment, when the torsional elastic element 62 is a planar spiral spring 622, a keyway can be provided on the rotating shaft 5. The magnetic ring 61 can be rotated synchronously with the rotating shaft 5 by means of the keyway and the planar key. Alternatively, the magnetic ring 61 and the rotating shaft 5 can be directly connected, in which case the annular baffle 51 is not required.

[0054] To better understand this invention, the following is combined with... Figures 1 to 5 The technical solution of this invention is described in detail below. This embodiment provides a mechanical flux-changing motor based on a built-in tangential rotor. By setting a torsional elastic element 62, a magnetic guide ring 61, and a leakage magnetic block 63 between the rotor core 2 and the shaft 5, and cooperating with a permanent magnet 4 embedded in the rotor core 2, the size of the air gap magnetic flux between the rotor core 2 and the stator core 1 can be automatically adjusted, thereby adjusting the magnitude of the back electromotive force and ultimately expanding the adjustable range of the motor speed to adapt to different operating environments. Furthermore, since the torsional elastic element 62 and the magnetic guide ring 61 are both located inside the motor, the overall power density of the motor does not show a significant decrease.

[0055] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make several improvements and substitutions without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A mechanical flux-changing motor based on a built-in tangential rotor, comprising a stator core and a rotor core, wherein the rotor core is axially fixedly connected with an end cap, characterized in that, include: A permanent magnet is embedded between two sector-shaped portions of the rotor core, and a plurality of permanent magnets are arranged in a circumferential array. A rotating shaft passes through the middle of the rotor core and is rotatably connected to the rotor core on the same axis. The rotor is used to connect to an external load. A magnetic adjustment assembly includes a magnetic guide ring, a magnetic leakage block, and a torsional elastic element. The magnetic guide ring is coaxially disposed between the rotating shaft and the rotor core, and is fixedly connected to the rotating shaft. The magnetic leakage block protrudes from the outer wall of the magnetic guide ring facing the rotor core and is used to rotate relative to the permanent magnet to generate and adjust the magnetic leakage path. The two ends of the torsional elastic element are respectively fixedly connected to the end cap and the rotating shaft. When the torsional elastic element is in its initial untorsed state, the center line of the leakage magnetic block is located exactly in the middle of the center lines of two adjacent permanent magnets; A limiting plate is provided on the end face of the end cap facing the rotor core. The limiting plate is disposed between two adjacent leakage magnetic blocks. The limiting plate is used to limit the rotation range of the magnetic ring relative to the rotor core.

2. The mechanical flux-changing motor based on a built-in tangential rotor according to claim 1, characterized in that, The width of the magnetic leakage block is the same as the width of the corresponding permanent magnet, and multiple magnetic leakage blocks are provided for multiple permanent magnets.

3. The mechanical flux-changing motor based on a built-in tangential rotor according to claim 1, characterized in that, The end cap includes a front end cap and a rear end cap, the front end cap and the rear end cap respectively abut against two end faces in the direction of the rotor core axis; a locking screw is provided between the front end cap and the rear end cap, the locking screw passes through the rotor core, and the two ends of the locking screw are respectively fixedly connected to the front end cap and the rear end cap; The torsional elastic element is provided between the rotating shaft and the front end cover and / or the rear end cover.

4. The mechanical flux-changing motor based on a built-in tangential rotor according to claim 3, characterized in that, Multiple limiting plates are arranged circumferentially around the axis of the rotor core, and both the front end cover and the rear end cover are provided with the limiting plates.

5. The mechanical flux-changing motor based on a built-in tangential rotor according to claim 3, characterized in that, Bearings are provided between the rotating shaft and the front end cover and the rear end cover.

6. The mechanical flux-changing motor based on a built-in tangential rotor according to claim 3, characterized in that, The torsional elastic element includes a helical torsion spring, which is sleeved on the outside of the rotating shaft and located between the rotating shaft and the magnetic ring. One end of the helical torsion spring is fixedly connected to the front end cover or the rear end cover, and the other end of the helical torsion spring is fixedly connected to the rotating shaft.

7. The mechanical flux-changing motor based on a built-in tangential rotor according to claim 3, characterized in that, The torsional elastic element includes a planar spiral spring, the outer end of which is fixedly connected to the front end cover or the rear end cover, and the inner end of which is fixedly connected to the rotating shaft.

8. The mechanical flux-changing motor based on a built-in tangential rotor according to claim 1, characterized in that, The rotating shaft is provided with an annular baffle, and one end of the magnetic ring is provided with a positioning block. The annular baffle is provided with a positioning hole corresponding to the positioning block.

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