Rotor assembly, permanent magnet synchronous motor and vehicle

Abstract

The embodiment of the invention provides a rotor assembly, a permanent magnet synchronous motor and a vehicle, and the rotor assembly comprises a rotor iron core which is provided with a plurality of permanent magnet grooves which are uniformly distributed in the circumferential direction; the permanent magnets are arranged in the permanent magnet grooves; the plurality of magnetic conductive blocks are arranged corresponding to the plurality of permanent magnet grooves; the plurality of moving units are respectively connected with the plurality of magnetic conductive blocks and are used for driving the magnetic conductive blocks to move between a first position close to the permanent magnet grooves and a second position far away from the permanent magnet grooves along the radial direction so as to adjust the magnetic field distribution of the rotor assembly; the moving unit comprises a first moving unit arranged at the first end of the magnetic conductive block in the axial direction, the first moving unit comprises a first connecting rod and a first wedge-shaped sliding plate, the first connecting rod is fixedly connected with the magnetic conductive block, and a first guide groove inclined relative to the axial direction is formed in the first wedge-shaped sliding plate; the end, away from the magnetic conductive block, of the first connecting rod abuts against the first guide groove, and when the first wedge-shaped sliding plate moves in the axial direction, the first connecting rod and the magnetic conductive block are guided to move in the radial direction.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and more specifically, to a rotor assembly, a permanent magnet synchronous motor and a vehicle. Background Art

[0002] Permanent magnet synchronous motors have a series of advantages such as small size, low weight and high power density. They have been widely used in electric vehicles, high-speed railways, urban rail transit, aerospace and industrial production.

[0003] The air gap magnetic field of a permanent magnet synchronous motor is difficult to adjust, resulting in a narrow constant power region and limited width operation. It is necessary to use weak magnetic field control (also known as magnetic modulation) to increase the speed.

[0004] A feasible magnetic adjustment method is to set a magnetic conductive block in the rotor assembly, which can move radially between positions close to and far from the permanent magnet, thereby changing the magnetic field distribution of the rotor assembly. By adjusting the position of its radial movement, the rotor magnetic field can be actively and controllably adjusted. However, the internal space of the rotor assembly is limited, and how to set a mechanism for driving the movement of the magnetic conductive block in it to accurately adjust the position of the magnetic conductive block has become an urgent problem to be solved. Summary of the invention

[0005] The present application mainly provides a rotor assembly, a permanent magnet synchronous motor and a vehicle. Various aspects involved in the embodiments of the present application are introduced below.

[0006] In a first aspect, a rotor assembly is provided, comprising: a rotor core having a plurality of permanent magnet slots uniformly distributed along the circumferential direction; permanent magnets arranged in the permanent magnet slots; a plurality of magnetic conductive blocks arranged corresponding to the plurality of permanent magnet slots; a plurality of moving units respectively connected to the plurality of magnetic conductive blocks, for driving the magnetic conductive blocks to move radially between a first position close to the permanent magnet slots and a second position away from the permanent magnet slots, so as to adjust the magnetic field distribution of the rotor assembly; the moving unit comprises a first moving unit arranged at a first end of the magnetic conductive block along the axial direction, the first moving unit comprises a first connecting rod and a first wedge-shaped slide, the first connecting rod is fixedly connected to the magnetic conductive block, the first wedge-shaped slide has a first guide groove inclined relative to the axial direction, the end of the first connecting rod away from the magnetic conductive block abuts against the first guide groove, and when the first wedge-shaped slide moves along the axial direction, the first connecting rod and the magnetic conductive block are guided to move along the radial direction.

[0007] According to the above technical means, the radial movement of the magnetic block is converted into the axial movement of the first wedge-shaped slide by utilizing the cooperation between the first connecting rod and the inclined surface of the first wedge-shaped slide. By adjusting the axial position of the first wedge-shaped slide, the air gap magnetic field strength of the rotor assembly can be steplessly adjusted.

[0008] In some embodiments, the cross-section of the first guide groove is T-shaped, and the end of the first connecting rod away from the magnetic block has a first T-shaped end that matches the cross-sectional shape of the first guide groove, and the first T-shaped end is engaged with the first guide groove to slide in the first guide groove.

[0009] According to the above technical means, the cross section of the first guide groove is set to be T-shaped, and the side wall of the guide groove is used to constrain the moving direction of the first connecting rod, so that the guidance is more precise.

[0010] In some embodiments, the rotor assembly also includes a transmission screw extending along the axial direction, the transmission screw being rotatably connected to the rotor core, and the end of the transmission screw close to the first movable unit having a first external thread; the first wedge-shaped slide is provided with a first internal thread penetrating along the axial direction on the side close to the rotating shaft, the first internal thread cooperates with the first external thread, and when the transmission screw rotates, the first wedge-shaped slide moves along the axial direction.

[0011] According to the above technical means, the movement of the magnetic block is converted into the rotation of the first screw by utilizing the threaded transmission between the first wedge-shaped slide and the transmission screw, so that the radial position of the magnetic block can be steplessly adjusted, thereby adjusting the air gap magnetic field strength of the rotor assembly.

[0012] In some embodiments, the movable unit also includes a second movable unit arranged at the second end of the magnetic block along the axial direction, the second movable unit includes a second connecting rod and a second wedge-shaped slide, the second connecting rod is fixedly connected to the magnetic block, the second wedge-shaped slide has a second guide groove inclined relative to the axial direction, and the end of the second connecting rod away from the magnetic block abuts against the second guide groove; the first wedge slide and the second wedge slide move along the axial direction toward or away from each other, and the first connecting rod, the second connecting rod and the magnetic block are guided to approach or move away from the permanent magnet slot along the radial direction.

[0013] According to the above technical means, the first moving unit and the second moving unit are symmetrically arranged on both sides of the magnetic conductive block along the axial direction, and their combined effect can prevent the magnetic conductive block from being subjected to uneven force when moving.

[0014] In some embodiments, the cross-section of the second guide groove is T-shaped, and the end of the second connecting rod away from the magnetic block has a second T-shaped end matching the cross-sectional shape of the second guide groove, and the second T-shaped end is engaged with the second guide groove to slide in the second guide groove.

[0015] According to the above technical means, the cross section of the second guide groove is set to be T-shaped, and the side wall of the guide groove is used to constrain the moving direction of the second connecting rod, so that the guidance is more precise.

[0016] In some embodiments, the transmission screw has a second external thread at one end close to the second movable unit, and the second wedge-shaped slide is provided with a second internal thread extending along the axial direction on the side close to the rotating shaft. When the transmission screw rotates, the second internal thread cooperates with the second external thread. When the transmission screw rotates, the second wedge-shaped slide and the first wedge-shaped slide both move along the axial direction.

[0017] According to the above technical means, by setting a threaded transmission between the transmission screw and the second wedge-shaped slide plate, when the transmission screw rotates, the first wedge-shaped slide plate and the second wedge-shaped slide plate of the two magnetic blocks can be driven to move synchronously, thereby driving the magnetic blocks to move radially, avoiding the magnetic blocks from tilting due to uneven force.

[0018] In some embodiments, the first external thread and the second external thread have opposite hand directions.

[0019] In some embodiments, the rotor core includes: a core support and a plurality of punching sheets; wherein the core support is sleeved on the rotating shaft and fixedly connected to the rotating shaft; the plurality of punching sheets are stacked along the axial direction and sleeved on the core support; the transmission screw is inserted in the core support along the axial direction.

[0020] According to the above technical means, the rotor core is configured as a split structure consisting of a core support and punching sheets, which can save the amount of silicon steel material and reduce the cost of the rotor assembly.

[0021] In some embodiments, the rotor assembly further includes a driving unit, which is fixedly connected to the rotor core and is used to drive the transmission screw to rotate.

[0022] In some embodiments, the rotor assembly also includes a displacement sensor and a control unit; the displacement sensor is used to determine the position of the magnetic block; the control unit is connected to the displacement sensor and the drive unit, and is used to: determine the air gap magnetic field strength of the rotor assembly according to the position of the magnetic block, and, according to the air gap magnetic field strength and the target strength value, control the drive unit to drive the transmission screw to rotate and adjust the position of the magnetic block to adjust the air gap magnetic field strength to the target strength value.

[0023] According to the above technical means, a sensor is used to detect the radial position of the magnetic block to determine the main magnetic field strength, and then adjustment is made based on the main magnetic field strength, so that the magnetic field strength of the rotor assembly can be measured and the adjustment process can be controlled.

[0024] In some embodiments, the transmission screw is made of non-magnetic material.

[0025] According to the above technical means, the transmission screw is made of non-magnetic conductive material, which can avoid the transmission screw arranged in the rotor core from adversely affecting the magnetic field distribution of the rotor assembly.

[0026] In a second aspect, a permanent magnet synchronous motor is provided, comprising a rotor assembly as described in the first aspect.

[0027] In a third aspect, a vehicle is provided, the vehicle comprising the rotor assembly as described in the first aspect or the permanent magnet synchronous motor as described in the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of the structure of a rotor assembly provided in an embodiment of the present application;

[0029] Figure 2 for Figure 1 AA section view;

[0030] Figure 3 for Figure 2 BB cross-sectional view;

[0031] Figure 4 A schematic diagram of the structure of a mobile unit provided in another embodiment of the present application;

[0032] Figure 5 for Figure 4 CC cross-sectional view. DETAILED DESCRIPTION

[0033] The embodiments of the present application provide a rotor assembly, a permanent magnet synchronous motor and a vehicle. The technical solution of the present application is further specifically described below through the embodiments and in combination with the accompanying drawings. In the specification, the same or similar figure numbers indicate the same or similar parts. The following description of the implementation mode of the present application with reference to the accompanying drawings is intended to explain the overall concept of the present application and should not be construed as a limitation on the present application.

[0034] The permanent magnet synchronous motor (PMSM) is mainly composed of a stator assembly, a rotor assembly, a motor housing, etc. The stator assembly includes a stator core and a stator winding wound thereon. When a three-phase current is passed through the stator winding, a rotating magnetic field is generated. The rotating magnetic field interacts with the permanent magnetic field excited by the permanent magnet in the rotor assembly to provide torque for the rotor assembly.

[0035] Permanent magnet synchronous motors have a series of advantages such as small size, low weight, and high power density. They can output large torque at low speeds and have excellent low-speed performance. At the same time, my country is rich in rare earth mineral resources, and the manufacturing cost of permanent magnet synchronous motors is low. This makes permanent magnet synchronous motors widely used in electric vehicles, high-speed railways, urban rail transit, aerospace, and industrial production.

[0036] The air gap magnetic field of the permanent magnet synchronous motor is difficult to adjust, resulting in a narrow constant power area and limited width operation. In order to solve this problem, magnetic field weakening control (also known as magnetic field adjustment) can be used to increase the speed.

[0037] The motor magnetic adjustment methods in the related art include AC pulse magnetic adjustment, DC pulse magnetic adjustment and mechanical magnetic adjustment.

[0038] Among them, the AC pulse magnetization method is to apply a direct-axis charging / demagnetizing pulse current to the stator armature winding to realize the magnetization / demagnetization of the permanent magnet, thereby achieving the purpose of adjusting the air gap magnetic density and widening the operation of the motor.

[0039] The DC pulse magnetic modulation method is to set an additional DC magnetic modulation winding dedicated to magnetic modulation on the stator or rotor of the motor to realize the charging / demagnetization of the permanent magnet, or to directly use the motor armature winding to apply the magnetic modulation current.

[0040] The mechanical magnetic adjustment method is to change the magnetic field distribution of the main magnetic circuit of the motor by adding a mechanical mechanism in the stator or rotor, so as to adjust the air gap magnetic density of the motor. The mechanical structure can be, for example, a plurality of slots in the rotor core, and permanent magnets with the same polarity are arranged at both ends of the slots; when the motor speed increases, the permanent magnets that are not fixed will move closer to the air gap under the action of centrifugal force, so that the magnetic resistance of the main magnetic pole leakage magnetic circuit is reduced, the leakage magnetic flux is increased, and the magnetic flux passing through the air gap is reduced, so as to achieve the purpose of reducing the air gap magnetic density when the motor runs at high speed.

[0041] Among the various methods mentioned above, the weakening magnetic current during DC or AC pulse magnetic modulation will lead to higher copper loss, which will reduce the high-speed operation efficiency of the permanent magnet synchronous motor; at the same time, this method also requires the addition of additional components in the circuit part, resulting in increased costs. The existing mechanical magnetic modulation methods are mostly passive adjustments, that is, they cannot actively control their weak magnetic ability, and the weak magnetic ability of this method is limited, and it cannot achieve the expected effect.

[0042] In order to achieve deeper active adjustment of the permanent magnet magnetic field of the permanent magnet synchronous motor's rotor, a feasible way is to set a movable magnetic conductive block in the rotor assembly. The magnetic conductive block is made of a material with high saturation magnetic induction intensity and can move radially between positions close to and away from the permanent magnet, thereby changing the magnetic field distribution of the rotor assembly. By adjusting its radial movement position, active and controllable adjustment of the rotor magnetic field can be achieved.

[0043] However, the internal space of the rotor assembly is limited, and how to set a mechanism therein for driving the magnetic block to move so as to accurately adjust the position of the magnetic block has become an urgent problem to be solved.

[0044] In view of the above problems, the embodiments of the present application provide a rotor assembly, a permanent magnet synchronous motor and a vehicle. The technical solution of the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0045] Figure 1 is a schematic structural diagram of a rotor assembly 10 provided in an embodiment of the present application, Figure 2 yes Figure 1 For the convenience of explanation, Figure 2 Part of the structure of the rotor assembly 10 is omitted.

[0046] Combination Figure 1 and Figure 2 The rotor assembly 10 in the embodiment of the present application includes a rotor core 11 , a permanent magnet 12 , a magnetic conductive block 13 and a moving unit 14 .

[0047] The rotor core 11 has a plurality of permanent magnet slots 111 uniformly distributed along the circumferential direction. It should be noted that the circumferential direction mentioned here refers to the circumferential direction surrounding the axial direction of the rotor core 11, and the axial direction refers to the direction where the central axis of the rotor assembly 10 is located.

[0048] In some embodiments, the permanent magnet slots 111 include a first permanent magnet slot 1111 and a second permanent magnet slot 1112. The first permanent magnet slot 1111 and the second permanent magnet slot 1112 are symmetrically arranged about the center line of the D axis. The plurality of first permanent magnet slots 1111 and second permanent magnet slots 1112 in the rotor assembly 10 are arranged alternately and radially, that is, the first permanent magnet slots 1111 and the second permanent magnet slots 1112 are arranged in a V shape.

[0049] This rotor structure with V-shaped permanent magnet slots has the advantages of small leakage coefficient, no need for magnetic isolation measures on the rotating shaft, easier to control pole arc coefficient, high mechanical strength of rotor punchings, and not easy deformation of the rotor after installation. It can be used in many fields such as rail transportation and electric vehicles.

[0050] It should also be noted that in the rotor assembly provided in the embodiment of the present application, the arrangement of the permanent magnet slots is not limited to the above-mentioned V-shaped arrangement, and the arrangement of the permanent magnet slots can be any of radial, tangential or mixed arrangements.

[0051] The permanent magnet 12 is disposed in the permanent magnet slot 111. The permanent magnet 12 mentioned in the embodiment of the present application refers to a magnet that can maintain magnetism for a long time, such as natural magnetite (ferromagnetic ore) and artificial magnet steel (such as iron-nickel-cobalt magnet steel, neodymium-iron-boron magnet steel, etc.).

[0052] The magnetic conductive blocks 13 are arranged corresponding to the permanent magnet slots 111 , and each magnetic conductive block 13 is arranged radially on a side of the corresponding permanent magnet slot 111 close to the rotating shaft 15 .

[0053] The plurality of moving units 14 are respectively connected to the plurality of magnetic conductive blocks 13 for driving the magnetic conductive blocks 13 to move radially between a first position close to the permanent magnet slots 111 and a second position away from the permanent magnet slots 111 to adjust the magnetic field distribution of the rotor assembly 10 .

[0054] According to the principle of minimum magnetic resistance, the magnetic field will be distributed along the direction with smaller magnetic resistance, and the magnetic resistance of the magnetic conductive block 13 is much smaller than that of air. Therefore, in the rotor assembly 10, the magnetic flux lines of the permanent magnetic field generated by the permanent magnet 12 will preferentially pass through the magnetic conductive block 13; when the magnetic conductive block 13 moves under the action of the moving unit 14, the magnetic field distribution in the rotor assembly 10 changes accordingly.

[0055] More specifically, when the magnetic block 13 moves to the first position close to the permanent magnet slot 111, the permanent magnetic field of the rotor will gather toward the position of the magnetic block 13; in other words, when the magnetic block 13 is located at the first position close to the permanent magnet slot 111, the permanent magnetic field of the rotor does not pass through the air gap of the rotor assembly 10; in other words, when the magnetic block 13 is located at the first position close to the permanent magnet slot 111, the air gap magnetic field of the rotor assembly 10 is 0.

[0056] When the magnetic block 13 moves to the second position away from the permanent magnet slot 111, an air gap is formed between the magnetic block 13 and the rotor core, and the magnetic resistance at this position is relatively large. The permanent magnetic field of the permanent magnet 12 will preferentially pass through the rotor core 11 with a smaller magnetic resistance, and at this time, the magnetic field strength of the air gap magnetic field of the rotor assembly 10 is relatively large.

[0057] When the magnetic block 13 is at different positions between the first position and the second position, the width of the air gap between the magnetic block 13 and the rotor core 11 is different, resulting in different effects of the magnetic block 13 on the air gap magnetic field of the rotor assembly 10; that is, by adjusting the position of the magnetic block 13, the permanent magnetic field of the rotor assembly 10 can be adjusted.

[0058] In some embodiments, the magnetic conductive block 13 is made of a material with high saturation magnetic flux density, such as 1J22 alloy, 2J10 alloy, 1J85 alloy, etc., and its saturation magnetic flux density can reach 2.4T or above, which is much greater than the saturation magnetic flux density of air and silicon steel sheets. The magnetic conductive block 13 made of a material with high saturation magnetic flux density can achieve the maximum adjustment requirement for the magnetic flux of the rotor assembly 10 at the minimum size.

[0059] like Figure 2 As shown, the moving unit 14 includes a first moving unit 14A disposed at a first end of the magnetic conductive block 13 along the axial direction. The first end may be any end of the magnetic conductive block 13 along the axial direction, for example, Figure 2 From the perspective of FIG. 1 , the first movable unit 14A is located on the left side of the magnetic conductive block 13 along the axial direction.

[0060] The first moving unit 14A includes a first connecting rod 141A and a first wedge-shaped slide 142A, and the first connecting rod 141A is fixedly connected to the magnetic block 13. The connection method between the first connecting rod 141A and the magnetic block 13 can be, for example, welding, riveting, bonding or threaded connection, and the specific method is not limited in the embodiment of the present application.

[0061] The first wedge-shaped slide plate 142A has a first guide groove 1421A which is inclined relative to the axial direction of the rotor assembly 10 , and one end of the first connecting rod 141A away from the magnetic conductive block 13 abuts against the first guide groove 1421A.

[0062] One end of the first connecting rod 141A away from the magnetic block 13 can be a plane matching the extension direction of the first guide groove 1421A. The first wedge-shaped slide plate 142A is configured to be able to move axially along the rotor assembly 10. During its movement, the first guide groove 1421A interacts with the end of the first connecting rod 141A, so that the first connecting rod 141A and the magnetic block 13 are guided to move radially.

[0063] According to the above technical means, the radial movement of the magnetic block is converted into the axial movement of the first wedge-shaped slide by utilizing the cooperation between the first connecting rod and the inclined surface of the first wedge-shaped slide. By adjusting the axial position of the first wedge-shaped slide, the air gap magnetic field strength of the rotor assembly can be steplessly adjusted.

[0064] In some embodiments, the first connecting rod 141A is made of a non-magnetic material, and may be a non-magnetic metal material or a non-metal material, which is not limited in the embodiments of the present application.

[0065] Figure 3 yes Figure 2 The BB section view in Figure 3As shown, in some embodiments, the cross-section of the first guide groove 1421A is T-shaped, and the end of the first connecting rod 141A away from the magnetic block 13 has a first T-shaped end that matches the cross-sectional shape of the first guide groove 1421A, and the first T-shaped end is engaged with the first guide groove 1421A to slide in the first guide groove 1421A.

[0066] According to the above technical means, the cross section of the first guide groove is set to be T-shaped, and the side wall of the guide groove is used to constrain the moving direction of the first connecting rod, so that the guidance is more precise.

[0067] In some embodiments, refer to Figure 2 The rotor assembly 10 further includes a transmission screw 16 extending along the axial direction of the rotor assembly 10 , the transmission screw 16 is rotatably connected to the rotor core 11 , and one end of the transmission screw 16 close to the first movable unit 14A along the axial direction has a first external thread 161 .

[0068] The first wedge-shaped slide plate 142A has a first internal thread 1422A axially penetrating the first wedge-shaped slide plate 142A on one side close to the rotating shaft 15. The first internal thread 1422A is thread-matched with the first external thread 161. When the transmission screw 16 rotates, the first wedge-shaped slide plate 142A moves axially. The first internal thread 1422A and the first external thread 161 have the same tooth profile, pitch and rotation direction.

[0069] According to the above technical means, the movement of the magnetic block is converted into the rotation of the first screw by utilizing the threaded transmission between the first wedge-shaped slide and the transmission screw, so that the radial position of the magnetic block can be steplessly adjusted, thereby adjusting the air gap magnetic field strength of the rotor assembly.

[0070] In some embodiments, the transmission screw 16 is made of non-magnetic material, such as non-magnetic metal.

[0071] According to the above technical means, the transmission screw is made of non-magnetic conductive material, which can avoid the transmission screw arranged in the rotor core from adversely affecting the magnetic field distribution of the rotor assembly.

[0072] In some embodiments, Figure 4 As shown, the moving unit 14 further includes a second moving unit 14B disposed at the second end of the magnetic conductive block 13 along the axial direction, and the second moving unit 14B includes a second connecting rod 141B and a second wedge-shaped slide plate 142B.

[0073] The second connecting rod 141B is connected to the magnetic conductive block 13. The second connecting rod 141B can be connected to the magnetic conductive block 13 by welding, riveting, bonding or threaded connection, which is not specifically limited in the embodiment of the present application.

[0074] The second wedge-shaped slide plate 142B has a second guide groove 1421B which is inclined relative to the axial direction of the rotor assembly. One end of the second connecting rod 141B away from the magnetic conductive block 13 abuts against the second guide groove 1421B.

[0075] One end of the second connecting rod 141B away from the magnetic block 13 can be a plane matching the extension direction of the second guide groove 1421B. The second wedge block is configured to be able to move axially along the rotor assembly 10. During its movement, the second guide groove 1421B interacts with the end of the second connecting rod 141B, so that the second connecting rod 141B and the magnetic block 13 are guided to move radially.

[0076] The first guide groove 1421A and the second guide groove 1421B are symmetrical along a plane perpendicular to the rotor assembly 10. When the first wedge-shaped slide plate 142A and the second wedge-shaped slide plate 142B move in the axial direction toward or away from each other, the first connecting rod, the second connecting rod and the magnetic guide block 13 are guided to a position radially close to the permanent magnet groove away from the permanent magnet groove.

[0077] According to the above technical means, the first moving unit and the second moving unit are symmetrically arranged on both sides of the magnetic conductive block along the axial direction, and their combined effect can prevent the magnetic conductive block from being subjected to uneven force when moving.

[0078] In some embodiments, the second connecting rod 141B is made of a non-magnetic material, and may be a non-magnetic metal material or a non-metal material, which is not limited in the embodiments of the present application.

[0079] In some embodiments, the first connecting rod 141A in the first movable unit 14A and the second connecting rod 141B in the second movable unit 14B can be an integrally formed structure, that is, the first connecting rod 141A and the second connecting rod 141B are the same connecting rod, which can be inserted into the magnetic conductive block 13.

[0080] Figure 5 yes Figure 4 The CC section view is as follows: Figure 5 As shown, in some embodiments, the cross-section of the second guide groove 1421B is T-shaped, and the end of the second connecting rod 141B away from the magnetic block 13 has a second T-shaped end that matches the cross-sectional shape of the second guide groove 1421B, and the second T-shaped end is engaged with the second guide groove 1421B to slide in the second guide groove 1421B.

[0081] According to the above technical means, the cross section of the second guide groove is set to be T-shaped, and the side wall of the guide groove is used to constrain the moving direction of the second connecting rod, so that the guidance is more precise.

[0082] In some embodiments, see Figure 4The end of the transmission screw 16 close to the second moving unit 14B has a second external thread 162. The second wedge-shaped slide plate 142B is provided with a second internal thread 1422B that penetrates radially on the side close to the rotating shaft 15. The second internal thread 1422B forms a threaded fit with the second external thread 162. When the transmission screw 16 rotates, the second wedge-shaped slide plate 142B and the first wedge-shaped slide plate 142A both move axially.

[0083] According to the above technical means, by setting a threaded transmission between the transmission screw and the second wedge-shaped slide plate, when the transmission screw rotates, the first wedge-shaped slide plate and the second wedge-shaped slide plate of the two magnetic blocks can be driven to move synchronously, thereby driving the magnetic blocks to move radially, avoiding the magnetic blocks from tilting due to uneven force.

[0084] Continue reading Figure 4 When the transmission screw 16 rotates, the first external thread 161 and the second external thread 162 arranged at both ends of the transmission screw 16 rotate in the same direction. If the first external thread 161 and the second external thread 162 rotate in the same direction, the first wedge slide 142A and the second wedge slide 142B will move synchronously in the same direction. In order to enable the magnetic block 13 to move radially, it is necessary to enable the first wedge slide 142A and the second wedge slide 142B to move toward or away from each other. For example, Figure 4 In the example, when the first wedge-shaped slide 142A and the second wedge-shaped slide 142B move toward each other, the magnetic block 13 moves away from the permanent magnet slot; when the first wedge-shaped slide 142A and the second wedge-shaped slide 142B move away from each other, the magnetic block 13 moves toward the permanent magnet slot.

[0085] To achieve the above purpose, in some embodiments of the present application, the first external thread 161 and the second external thread 162 may be set to have opposite directions of rotation. For example, the first external thread 161 is a right-handed thread, and the second external thread 162 is a left-handed thread; or the first external thread 161 is a left-handed thread, and the second external thread 162 is a right-handed thread.

[0086] In some embodiments, the rotor core 11 includes a core support 112 and a plurality of punching sheets 113. The core support 112 is sleeved on the rotating shaft 15 and is fixedly connected to the rotating shaft 15. The plurality of punching sheets 113 are stacked in an axial direction and sleeved on the core support 112. The aforementioned transmission screw 16 is axially penetrated in the core support 112.

[0087] According to the above technical means, the rotor core is configured as a split structure consisting of a core support and punching sheets, which can save the amount of silicon steel material and reduce the cost of the rotor assembly.

[0088] In some embodiments, the rotor assembly 10 further includes a driving unit, which is fixedly connected to the rotor core 11 and is used to drive the transmission screw 16 to rotate. The driving unit may be, for example, a driving motor, or a hydraulic motor.

[0089] In some embodiments, the rotor assembly 10 further includes a sensor and a control unit.

[0090] The sensor is used to determine the position of the magnetic conductive block 13. There are multiple methods for determining the position of the magnetic conductive block 13 according to different settings of the sensor.

[0091] As an implementation method, the sensor can be a distance sensor, which can be radially arranged on one side of the magnetic block 13, for example, on the side of the magnetic block 13 close to the rotating shaft 15, and is used to measure the distance between the end of the sensor and the end face of the magnetic block 13 close to the rotating shaft 15, and determine the position of the magnetic block 13 based on the distance.

[0092] Alternatively, the distance sensor may be axially arranged at one end of the first wedge-shaped slide 142A and / or the second wedge-shaped slide 142B to measure the distance between the end of the sensor and the first wedge-shaped slide 142A, and the distance may also reflect the position of the magnetic block 13 .

[0093] As another implementation, the sensor may also be a sensor for measuring rotation angle, such as a Hall sensor, which can be used to measure the rotation angle of the transmission screw 16 and determine the position of the magnetic block 13 according to the change in the rotation angle.

[0094] The control unit is connected to the sensor and the drive unit, and is used to determine the air gap magnetic field strength of the rotor assembly 10 according to the position of the magnetic block 13. According to the air gap magnetic field strength and the target magnetic field strength value, the drive unit is controlled to drive the transmission screw 16 to adjust the position of the magnetic block 13 to adjust the air gap magnetic field strength of the rotor assembly 10 to the target magnetic field strength value.

[0095] It should be understood that the position of the magnetic block 13 and the air gap magnetic field strength value usually have a one-to-one correspondence. When the position of the magnetic block 13 is adjusted according to the target magnetic field strength value, the target position of the magnetic block 13 can be determined based on the pre-established mapping relationship between the position of the magnetic block 13 and the magnetic field strength; then, the target stroke of the drive unit is determined based on the deviation between the target position and the current position of the magnetic block 13; and based on the target stroke of the drive unit, a control signal is sent to the drive unit to move the magnetic block 13 to the target position.

[0096] According to the above technical means, a sensor is used to detect the radial position of the magnetic block to determine the main magnetic field strength, and then adjustment is made based on the main magnetic field strength, so that the magnetic field strength of the rotor assembly can be measured and the adjustment process can be controlled.

[0097] An embodiment of the present application further provides a permanent magnet synchronous motor, including a rotor assembly and a stator assembly, wherein the rotor assembly is the rotor assembly 10 described in any of the above embodiments.

[0098] The permanent magnet synchronous motor can be applied in various fields such as aviation, national defense, industrial and agricultural production and daily life. Specifically, the motor can be applied to industrial drive devices, automation equipment, fans, pumps, compressors, machine tools, robots, and vehicles.

[0099] The vehicles may include land vehicles, air vehicles, water vehicles, industrial equipment, agricultural equipment or recreational equipment, etc.

[0100] Exemplarily, the water transportation vehicle may be a hovercraft, a motorboat, a motorboat, a fishing boat, a cruise ship, a sailboat, a yacht or other vessel.

[0101] The air transportation means may be an airplane, and the land transportation means may be a vehicle.

[0102] An embodiment of the present application also provides a vehicle, which includes the rotor assembly 10 or the permanent magnet synchronous motor in any of the above embodiments.

[0103] In some embodiments, the vehicle is a transportation vehicle. Exemplarily, the vehicle is one of a commercial vehicle, a passenger car, a motorcycle, a flying car, and a train.

[0104] In some embodiments, the vehicle is an industrial vehicle or an engineering vehicle. Exemplarily, the vehicle is one of a forklift, a trailer, a tractor, an excavator, a bulldozer, and a crane.

[0105] In some embodiments, the vehicle may be an electric vehicle or a fuel vehicle, wherein the vehicle is exemplarily one of a pure electric vehicle / battery electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV) and a plug-in hybrid electric vehicle (PHEV).

[0106] In some embodiments, the vehicle may also be agricultural equipment (such as a lawn mower, a harvester, etc.), amusement equipment, a toy vehicle, etc.

[0107] In some embodiments, the vehicle may also be a high-speed railway train, an EMU train, an urban rail transit vehicle, etc.

[0108] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0109] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0110] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0111] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0112] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0113] The above is only a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A rotor assembly, characterized in that: include: A rotor core having a plurality of permanent magnet slots uniformly distributed along the circumferential direction; A permanent magnet is disposed in the permanent magnet slot; A plurality of magnetic conductive blocks are arranged corresponding to the plurality of permanent magnet slots; A plurality of moving units are respectively connected to the plurality of magnetic conductive blocks, and are used to drive the magnetic conductive blocks to move radially between a first position close to the permanent magnet slot and a second position away from the permanent magnet slot, so as to adjust the magnetic field distribution of the rotor assembly; The movable unit includes a first movable unit arranged at the first end of the magnetic block along the axial direction, the first movable unit includes a first connecting rod and a first wedge-shaped slide, the first connecting rod is fixedly connected to the magnetic block, the first wedge-shaped slide has a first guide groove inclined relative to the axial direction, one end of the first connecting rod away from the magnetic block abuts against the first guide groove, when the first wedge-shaped slide moves along the axial direction, the first connecting rod and the magnetic block are guided to move along the radial direction.

2. The rotor assembly according to claim 1, characterized in that The cross section of the first guide groove is T-shaped, and the end of the first connecting rod away from the magnetic conductive block has a first T-shaped end matching the cross-sectional shape of the first guide groove, and the first T-shaped end is embedded in the first guide groove to slide in the first guide groove.

3. The rotor assembly according to claim 2, characterized in that: The rotor assembly further comprises a transmission screw extending along the axial direction, the transmission screw being rotatably connected to the rotor core, and an end of the transmission screw close to the first moving unit having a first external thread; A first internal thread penetrating along the axial direction is provided on one side of the first wedge-shaped slide plate close to the rotating shaft, and the first internal thread cooperates with the first external thread. When the transmission screw rotates, the first wedge-shaped slide plate moves along the axial direction.

4. The rotor assembly according to claim 3, characterized in that: The mobile unit further comprises a second mobile unit arranged at a second end of the magnetic conductive block along the axial direction, the second mobile unit comprises a second connecting rod and a second wedge-shaped slide plate, the second connecting rod is fixedly connected to the magnetic conductive block, the second wedge-shaped slide plate has a second guide groove inclined relative to the axial direction, and one end of the second connecting rod away from the magnetic conductive block abuts against the second guide groove; The first wedge-shaped slide plate and the second wedge-shaped slide plate move toward or away from each other along the axial direction, and the first connecting rod, the second connecting rod and the magnetic conductive block are guided to approach or away from the permanent magnet slot along the radial direction.

5. The rotor assembly according to claim 4, characterized in that: The cross section of the second guide groove is T-shaped, and the end of the second connecting rod away from the magnetic block has a second T-shaped end matching the cross-sectional shape of the second guide groove, and the second T-shaped end is embedded in the second guide groove to slide in the second guide groove.

6. The rotor assembly according to claim 5, characterized in that The transmission screw has a second external thread at one end close to the second movable unit, and the second wedge-shaped slide is provided with a second internal thread penetrating along the axial direction on the side close to the rotating shaft. When the transmission screw rotates, the second internal thread cooperates with the second external thread. When the transmission screw rotates, the second wedge-shaped slide and the first wedge-shaped slide both move along the axial direction.

7. The rotor assembly according to claim 6, characterized in that The first external thread and the second external thread have opposite rotation directions.

8. The rotor assembly according to any one of claims 3 to 7, characterized in that: The rotor core comprises: a core support and a plurality of punching sheets; Wherein, the core bracket is sleeved on the rotating shaft and fixedly connected to the rotating shaft; The plurality of punching sheets are stacked along the axial direction and sleeved on the core support; The transmission screw is arranged in the core bracket along the axial direction.

9. The rotor assembly according to any one of claims 3 to 7, characterized in that: The rotor assembly also includes a driving unit, which is fixedly connected to the rotor core and is used to drive the transmission screw to rotate.

10. The rotor assembly according to claim 9, characterized in that Also includes a displacement sensor and a control unit; The displacement sensor is used to determine the position of the magnetic block; The control unit is connected to the displacement sensor and the drive unit, and is used to: determine the air gap magnetic field strength of the rotor assembly according to the position of the magnetic block, and, according to the air gap magnetic field strength and the target strength value, control the drive unit to drive the transmission screw to rotate and adjust the position of the magnetic block to adjust the air gap magnetic field strength to the target strength value.

11. The rotor assembly according to any one of claims 3 to 7, characterized in that: The transmission screw rod is made of non-magnetic material.

12. A permanent magnet synchronous motor, characterized in that: The invention comprises a rotor assembly and the rotor assembly according to any one of claims 1 to 11.

13. A vehicle, characterized in that: The vehicle comprises: a rotor assembly as claimed in any one of claims 1 to 11, or a permanent magnet synchronous motor as claimed in claim 12.

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