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, in the axial direction, of the magnetic conductive block, the first moving unit comprises a first lead screw and a first moving seat, the first moving seat is connected with the magnetic conductive block, and the first lead screw drives the first moving seat to move through threaded transmission between the first lead screw and the first moving seat so as to drive the magnetic conductive block to move.

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 movable 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 movable unit comprises a first movable unit arranged at a first end of the magnetic conductive block along an axial direction, the first movable unit comprises a first screw rod and a first movable seat, the first movable seat is connected to the magnetic conductive block, and the first screw rod drives the first movable seat to move through a threaded transmission between the first screw rod and the first movable seat, so as to drive the magnetic conductive block to move.

[0007] 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 screw and the first movable seat, 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.

[0008] In some embodiments, the rotor assembly also includes a driving unit and a transmission unit; the transmission unit includes a first gear and multiple second gears that are meshed with each other, the first gear is fixedly connected to the output end of the driving unit, and the multiple second gears are respectively fixed to one end of the multiple first screw rods close to the rotating shaft of the rotor assembly, and the driving unit drives the multiple first screw rods to rotate through the first gear and the multiple second gears.

[0009] According to the above technical means, the axial rotation of the driving unit is converted into the rotation of the first screw around its axis by using a gear mechanism, and the structure is compact and has high reliability.

[0010] In some embodiments, the driving unit is an outer rotor motor, the stator of the outer rotor motor is mounted on the rotating shaft and fixedly connected to the rotating shaft; the first gear and the second gear are bevel gears, the first gear is fixedly connected to the rotor of the outer rotor motor, and the intersection angle of the rotating axes of the first gear and the second gear is 90 degrees.

[0011] According to the above technical means, a drive unit formed by an outer rotor motor and a transmission unit formed by mutually meshing bevel gears are used to realize the commutation of the rotary drive by utilizing the limited space in the rotor assembly. This drive and transmission method has strong reliability and compact structure, which is conducive to the miniaturization of permanent magnet synchronous motors.

[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 screw rod and a second movable seat, the second movable seat is connected to the magnetic block, and the second screw rod drives the second movable seat to move through a threaded transmission between the screw rod and the second movable seat to drive the magnetic block to move.

[0013] According to the above technical means, a second moving unit is arranged at the other end of the magnetic conductive block along the axial direction, and the second moving unit can cooperate with the first moving unit to drive the magnetic conductive block to move, thereby avoiding tilting of the magnetic conductive block during movement.

[0014] In some embodiments, the transmission unit also includes a transmission shaft, a third gear, a fourth gear and multiple fifth gears; wherein the transmission shaft is arranged along the axial direction and is rotatably connected to the rotor core; the third gear and the fourth gear are fixed at both ends of the transmission shaft along the axial direction, and the third gear is meshed with the second gear; the multiple fifth gears are respectively fixed to one end of multiple second screw rods close to the rotating shaft, and are meshed with the fourth gear; the second gear drives the transmission shaft and the fourth gear to rotate through the meshing with the third gear, and the fifth gear drives the second screw rod to rotate synchronously with the first screw rod under the action of the fourth gear, so that the first moving seat and the second moving seat move synchronously.

[0015] According to the above technical means, the transmission shaft arranged between the first mobile unit and the second mobile unit is used to make the first mobile seat and the second mobile seat move synchronously through gear meshing, which can prevent the magnetic block from tilting during movement.

[0016] In some embodiments, the first screw and the second screw have opposite thread directions.

[0017] According to the above technical means, the rotation directions of the first screw and the second screw are set to be different, so that when the first screw and the second screw rotate in opposite directions under the action of the transmission unit, the movement directions of the first moving seat and the second moving seat are consistent.

[0018] In some embodiments, the rotor core includes a core support and a plurality of punching sheets; 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 shaft passes through the core support along the axial direction.

[0019] 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.

[0020] In some embodiments, the rotor assembly also includes a sensor and a control unit; the sensor is used to determine the position of the magnetic block; 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 according to the position of the magnetic block, and, according to the air gap magnetic field strength and the target magnetic field strength value, control the drive unit to drive the transmission unit to adjust the position of the magnetic block to adjust the air gap magnetic field strength to the target magnetic field strength value.

[0021] 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.

[0022] In some embodiments, the first movable unit also includes a first fixed seat, which is fixedly connected to the rotor core, and a first bracket and a second bracket are respectively provided at two ends of the first fixed seat along the radial direction, and the first screw rod is movably connected to the first bracket and the second bracket.

[0023] In some embodiments, the second movable unit also includes a second fixed base, the second fixed base is fixedly connected to the rotor core, and the second fixed base is respectively provided with a third bracket and a fourth bracket at both ends along the radial direction, and the second screw rod is movably connected to the third bracket and the fourth bracket.

[0024] In a second aspect, a permanent magnet synchronous motor is provided, comprising a stator assembly and a rotor assembly as described in the first aspect.

[0025] In a third aspect, a vehicle is provided, 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

[0026] Figure 1 A schematic diagram of the structure of a rotor assembly provided in an embodiment of the present application;

[0027] Figure 2 for Figure 1 AA section view;

[0028] Figure 3 A schematic diagram of the structure of a mobile unit provided in another embodiment of the present application;

[0029] Figure 4 for Figure 3 Transmission diagram of

[0030] Figure 5 A schematic diagram of the structure of a first fixing base and a second fixing base provided in an embodiment of the present application;

[0031] Figure 6 A schematic structural diagram of a first fixing base and a second fixing base provided in another embodiment of the present application. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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 modulation) can be used to increase the speed.

[0036] The motor magnetic adjustment methods in the related art include AC pulse magnetic adjustment, DC pulse magnetic adjustment and mechanical magnetic adjustment.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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 hidden.

[0045] 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 .

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] The permanent magnet 12 is disposed in the permanent magnet slot 111. The permanent magnet 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.).

[0051] 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 .

[0052] 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 .

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] The first moving unit 14A includes a first screw rod 141A and a first moving seat 142A. The first moving seat 142A is connected to the magnetic conductive block 13. The first screw rod 141A drives the first moving seat 142A to move through threaded transmission between the first screw rod 141A and the first moving seat 142A, thereby driving the magnetic conductive block 13 to move.

[0060] The first movable seat 142A and the magnetic conductive block 13 can be connected by welding, threaded connection, riveting or bonding.

[0061] The extension direction of the first screw rod 141A is the radial direction of the rotor assembly 10. The threaded transmission between the first screw rod 141A and the first movable seat 142A can convert the rotation of the first screw rod 141A into the radial movement of the first movable seat 142A, and the first movable seat 142A then drives the magnetic block 13 to move radially.

[0062] The first screw rod 141A is provided with an external thread, and the first movable seat 142A is provided with an internal thread. The tooth profile, pitch and rotation direction of the external thread and the internal thread are the same.

[0063] 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 screw and the first movable seat, 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.

[0064] In some embodiments, the rotor assembly 10 further includes a driving unit 16 and a transmission unit 17 , wherein the transmission unit 17 is disposed between the driving unit 16 and the first screw rod 141A.

[0065] The drive unit 16 may be, for example, a drive motor, which may be an inner rotor motor or an outer rotor motor.

[0066] The transmission unit 17 includes a first gear 171 and a plurality of second gears 172 that mesh with each other. The first gear 171 is fixedly connected to the output end of the driving unit 16, and the plurality of second gears 172 are respectively fixed to one end of the plurality of first screw rods 141A close to the rotating shaft 15. The driving unit 16 drives the plurality of first screw rods 141A to rotate through the meshing of the first gear 171 and the plurality of second gears 172.

[0067] According to the above technical means, the axial rotation of the driving unit is converted into the rotation of the first screw around its axis by using a gear mechanism, and the structure is compact and has high reliability.

[0068] In some embodiments, Figure 2 As shown, the drive unit 16 is an outer rotor motor 161 , the stator of which is sleeved on the rotating shaft 15 of the rotor assembly 10 and fixedly connected to the rotating shaft 15 ; the rotating axis of the rotor of the outer rotor motor 161 coincides with the axis of the rotor assembly 10 .

[0069] The first gear 171 and the second gear 172 are both bevel gears (also called bevel gears). The first gear 171 is fixedly connected to the rotor of the outer rotor motor 161, and the intersection angle between its rotating axis and the rotating axis of the second gear 172 is 90 degrees.

[0070] According to the above technical means, a drive unit formed by an outer rotor motor and a transmission unit formed by mutually meshing bevel gears are used to realize the commutation of the rotary drive by utilizing the limited space in the rotor assembly. This drive and transmission method has strong reliability and compact structure, which is conducive to the miniaturization of permanent magnet synchronous motors.

[0071] In some embodiments, Figure 3 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. The second moving unit 14B and the first moving unit 14A are respectively disposed on both sides of the magnetic conductive block 13 along the axial direction.

[0072] The second moving unit 14B includes a second screw rod 141B and a second moving seat 142B. The second moving seat 142B is connected to the magnetic conductive block 13. The second screw rod 141B drives the second moving seat 142B to move through the threaded transmission between the second screw rod 141B and the second moving seat 142B, so as to drive the magnetic conductive block 13 to move.

[0073] The second movable seat 142B and the magnetic conductive block 13 can be connected by welding, threaded connection, riveting or bonding.

[0074] The extension direction of the second screw rod 141B is the radial direction of the rotor assembly 10. The threaded transmission between the second screw rod 141B and the second movable seat 142B can convert the rotation of the second screw rod 141B into the radial movement of the second movable seat 142B, and the second movable seat 142B then drives the magnetic block 13 to move radially.

[0075] The second screw rod 141B is provided with an external thread, and the second movable seat 142B is provided with an internal thread. The tooth profile, pitch and rotation direction of the external thread and the internal thread are the same.

[0076] According to the above technical means, a second moving unit is arranged at the other end of the magnetic conductive block along the axial direction, and the second moving unit can cooperate with the first moving unit to drive the magnetic conductive block to move, thereby avoiding tilting of the magnetic conductive block during movement.

[0077] In some embodiments, continue to refer to Figure 3 The transmission unit 17 further includes a transmission shaft 173 , a third gear 174 , a fourth gear 175 and a plurality of fifth gears 176 .

[0078] The transmission shaft 173 is disposed along the axial direction of the rotor assembly 10 and is rotatably connected to the rotor core 11 .

[0079] The third gear 174 and the fourth gear 175 are axially fixed at two ends of the transmission shaft 173 , and the third gear 174 is meshed with the second gear 172 .

[0080] The fifth gears 176 are respectively fixed to one end of the second screw rods 141B close to the rotating shaft 15 and mesh with the fourth gear 175 .

[0081] Figure 4 for Figure 3 Transmission diagram of Figure 4 The arrows in the figure indicate the rotation direction of each rotating component and the movement direction of the first moving seat 142A and the second moving seat 142B in the moving unit. It should be understood that Figure 4 The description is made by taking the direction in which the magnetic conductive block 13 moves away from the rotation shaft 15 as an example.

[0082] like Figure 4 As shown, the second gear 172 drives the transmission shaft 173 and the fourth gear 175 to rotate by meshing with the third gear 174, and the fifth gear 176 drives the second screw rod 141B to rotate synchronously with the first screw rod 141A under the action of the fourth gear 175, so that the first moving seat 142A and the second moving seat 142B move synchronously.

[0083] According to the above technical means, the transmission shaft arranged between the first mobile unit and the second mobile unit is used to make the first mobile seat and the second mobile seat move synchronously through gear meshing, which can prevent the magnetic block from tilting during movement.

[0084] In some embodiments, continue to refer to Figure 4 Under the action of the above-mentioned multiple gears, the first screw rod 141A and the second screw rod 141B rotate in opposite directions. In order to ensure that the first movable seat 142A and the second movable seat 142B move in the same direction, the thread rotation directions of the first screw rod 141A and the second screw rod 141B can be set to be opposite. For example, the first screw rod 141A is right-handed and the second screw rod 141B is left-handed; or the first screw rod 141A is left-handed and the second screw rod 141B is right-handed.

[0085] According to the above technical means, the rotation directions of the first screw and the second screw are set to be different, so that when the first screw and the second screw rotate in opposite directions under the action of the transmission unit, the movement directions of the first moving seat and the second moving seat are consistent.

[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 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 transmission shaft 173 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] It is understandable that, as a possible implementation method, in the technical solution provided in the embodiment of the present application, the aforementioned transmission shaft 173 and the third gear 174 may not be provided between the first mobile unit 14A and the second mobile unit 14B, but a separate drive unit may be provided for the second mobile unit 14B. For example, a separately provided second outer rotor motor is used to provide power for the fourth gear 175, and the power is transmitted to the second screw rod 141B by the engagement of the fourth gear 175 and the fifth gear 176, thereby driving the second mobile seat 142B to move. In this technical solution, by controlling the drive units on both sides to output synchronously, the purpose of synchronous movement of the first mobile seat 142A and the second mobile seat 142B on both sides can also be achieved.

[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, 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. Alternatively, since the first movable seat 142A or the second movable seat 142B moves synchronously with the magnetic block 13, the distance sensor can also be radially arranged on one side of the first movable seat 142A or the second movable seat 142B, for example, on the side of the first movable seat 142A close to the rotating shaft 15, to measure the distance between the end of the sensor and the end face of the first movable seat 142A close to the rotating shaft 15, and the distance can also reflect the position of the magnetic block 13.

[0092] As another implementation, the sensor can also be a sensor for measuring rotation angle, such as a Hall sensor, which can be used to measure the rotation angle of any gear or drive motor, and determine the position of the magnetic block 13 through the transmission ratio of the rotation angle and the transmission unit 17.

[0093] The control unit is connected to the sensor and the drive unit 16, 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, and control the drive unit 16 to drive the transmission unit 17 to adjust the position of the magnetic block 13 according to the air gap magnetic field strength and the target magnetic field strength value, so as to adjust the air gap magnetic field strength of the rotor assembly 10 to the target magnetic field strength value.

[0094] 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 16 is determined based on the deviation between the target position and the current position of the magnetic block 13 and the transmission ratio of the transmission unit 17; and based on the target stroke of the drive unit 16, a control signal is sent to the drive unit 16 so that the drive unit 16 and the transmission unit 17 move the magnetic block 13 to the target position.

[0095] 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.

[0096] In some embodiments, see Figure 2 The first moving unit 14A further comprises a first fixing seat 143A, which is fixedly connected to the rotor core 11, and a first bracket 144A and a second bracket 145A are respectively disposed at two ends of the first fixing seat 143A in the radial direction. The first screw rod 141A is movably connected to the first bracket 144A and the second bracket 145A.

[0097] In some embodiments, the first fixing base 143A may be Figure 5 The split structure shown in the figure includes a first base plate 1431A, a first bracket 144A and a second bracket 145A.

[0098] The first bottom plate 1431A is in the shape of a rectangular plate, and the first bracket 144A and the second bracket 145A are respectively arranged at two ends of the first bottom plate 1431A along the length direction.

[0099] The first bracket 144A is disposed at one end close to the rotating shaft 15, and the second bracket 145A is disposed at one end away from the rotating shaft 15. The first bracket 144A is provided with a first opening 1441A, and the second bracket 145A is provided with a second opening 1451A. When the first bracket 144A and the second bracket 145A are fixed to the first bottom plate 1431A, the first opening 1441A and the second opening 1451A are concentric, and the end of the first screw rod 141A close to the rotating shaft 15 is penetrated in the first opening 1441A.

[0100] The first bracket 144A and the second bracket 145A can be connected to the first bottom plate 1431A by welding, riveting, bonding or screwing. Figure 5In the split structure shown, the first bracket 144A and the second bracket 145A are respectively provided with a first through hole 1442A and a second through hole 1452A, and a corresponding threaded hole is provided on the first base plate 1431A. The first bracket 144A and the second bracket 145A can be fixed on the first base plate 1431A by passing a threaded connector (such as a screw) through the first through hole 1442A and the second through hole 1452A and the threaded hole on the first base plate 1431A.

[0101] In some embodiments, a first bearing is disposed between the first screw rod 141A and the first opening 1441A, and a second bearing is disposed between the first screw rod 141A and the second opening 1451A. The first bearing and the second bearing can reduce the rotational resistance of the first screw rod 141A.

[0102] The first bearing and the second bearing may be rolling bearings or sliding bearings, which is not limited in the present application.

[0103] In some embodiments, the first fixing seat 143A may also be Figure 6 The integrated structure shown in FIG. It can be processed by milling, drilling and other processes using the same blank. Specifically, a rectangular groove is prepared in the middle of the cubic blank by milling, and the first bracket 144A and the second bracket 145A are formed at both ends of the rectangular groove. Circular through holes are processed on the end faces of the first bracket 144A and the second bracket 145A to form the first opening 1441A and the second opening 1451A.

[0104] In some embodiments, see Figure 3 The second moving unit 14B further comprises a second fixing seat 143B, which is fixedly connected to the rotor core 11. A third bracket 144B and a fourth bracket 145B are respectively arranged at two ends of the second fixing seat 143B in the radial direction. The second screw rod 141B is movably connected to the third bracket 144B and the fourth bracket 145B.

[0105] In some embodiments, the second fixing base 143B may be a split structure, which includes a second bottom plate 1431B, a third bracket 144B and a fourth bracket 145B.

[0106] The second bottom plate 1431B is in a rectangular plate shape, and the third bracket 144B and the fourth bracket 145B are respectively arranged at two ends of the second bottom plate 1431B along the length direction.

[0107] The third bracket 144B is arranged at one end close to the rotating shaft 15, and the fourth bracket 145B is arranged at one end away from the rotating shaft 15. The third bracket 144B is provided with a third opening 1441B, and the fourth bracket 145B is provided with a fourth opening 1451B. When the third bracket 144B and the fourth bracket 145B are fixed to the second bottom plate 1431B, the third opening 1441B and the fourth opening 1451B are concentric, and the end of the second screw rod 141B close to the rotating shaft 15 is penetrated through the third opening 1441B.

[0108] The third bracket 144B and the fourth bracket 145B can be connected to the second bottom plate 1431B by welding, riveting, bonding or threading. Figure 5 In the split structure shown, the third bracket 144B and the fourth bracket 145B are respectively provided with a third through hole 1442B and a fourth through hole 1452B, and corresponding threaded holes are provided on the second base plate 1431B. Threaded connectors (such as screws) can be passed through the third through hole 1442B and the fourth through hole 1452B and the threaded holes on the second base plate 1431B to fix the third bracket 144B and the fourth bracket 145B on the second base plate 1431B.

[0109] In some embodiments, a third bearing is disposed between the second screw rod 141B and the third opening 1441B, and a fourth bearing is disposed between the second screw rod 141B and the fourth opening 1451B. The third bearing and the fourth bearing can reduce the rotational resistance of the second screw rod 141B.

[0110] The third bearing and the fourth bearing mentioned above can be rolling bearings or sliding bearings, and the implementation of this application does not limit this.

[0111] In some embodiments, the second fixing base 143B may also be Figure 6 The integrated structure shown in FIG. It can be processed by milling, drilling and other processes using the same blank. Specifically, a rectangular groove is prepared in the middle of the cubic blank by milling, and the third bracket 144B and the fourth bracket 145B are formed at both ends of the rectangular groove. Circular through holes are processed on the end faces of the third bracket 144B and the fourth bracket 145B to form the third opening 1441B and the fourth opening 1451B.

[0112] 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.

[0113] 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.

[0114] The vehicles may include land vehicles, air vehicles, water vehicles, industrial equipment, agricultural equipment or recreational equipment, etc.

[0115] 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.

[0116] The air transportation means may be an airplane, and the land transportation means may be a vehicle.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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).

[0121] In some embodiments, the vehicle may also be agricultural equipment (such as a lawn mower, a harvester, etc.), amusement equipment, a toy vehicle, etc.

[0122] In some embodiments, the vehicle may also be a high-speed railway train, an EMU train, an urban rail transit vehicle, etc.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] 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.

[0128] 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 screw rod and a first movable seat, the first movable seat is connected to the magnetic block, and the first screw rod drives the first movable seat to move through a threaded transmission between the first screw rod and the first movable seat to drive the magnetic block to move.

2. The rotor assembly according to claim 1, characterized in that The rotor assembly also includes a driving unit and a transmission unit; The transmission unit includes a first gear and multiple second gears that are meshed with each other. The first gear is fixedly connected to the output end of the driving unit. The multiple second gears are respectively fixed to one end of the rotating shaft of multiple first screw rods close to the rotor assembly. The driving unit drives the multiple first screw rods to rotate through the first gear and the multiple second gears.

3. The rotor assembly according to claim 2, characterized in that: The driving unit is an outer rotor motor, and the stator of the outer rotor motor is sleeved on the rotating shaft and fixedly connected to the rotating shaft; The first gear and the second gear are bevel gears, the first gear is fixedly connected to the rotor of the outer rotor motor, and the intersection angle between the rotating axis of the first gear and the rotating axis of the second gear is 90 degrees.

4. The rotor assembly according to claim 3, characterized in that: 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 screw rod and a second movable seat, the second movable seat is connected to the magnetic block, and the second screw rod drives the second movable seat to move through a threaded transmission between the second screw rod and the second movable seat to drive the magnetic block to move.

5. The rotor assembly according to claim 4, characterized in that: The transmission unit further includes a transmission shaft, a third gear, a fourth gear and a plurality of fifth gears; Wherein, the transmission shaft is arranged along the axial direction and is rotatably connected to the rotor core; The third gear and the fourth gear are fixed at two ends of the transmission shaft along the axial direction, and the third gear is meshed with the second gear; The plurality of fifth gears are respectively fixed to one end of the plurality of second screw rods close to the rotating shaft, and mesh with the fourth gear; The second gear drives the transmission shaft and the fourth gear to rotate by meshing with the third gear, and the fifth gear drives the second screw rod to rotate synchronously with the first screw rod under the action of the fourth gear, so that the first moving seat and the second moving seat move synchronously.

6. The rotor assembly according to claim 5, characterized in that The first screw rod and the second screw rod have opposite thread directions.

7. The rotor assembly according to claim 5, characterized in that: The rotor core comprises a core support and a plurality of punching sheets; 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 shaft is arranged in the core bracket along the axial direction.

8. The rotor assembly according to any one of claims 2 to 7, characterized in that: Also includes sensors and control units; The sensor is used to determine the position of the magnetic conductive block; 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 according to the position of the magnetic conductive block, and, according to the air gap magnetic field strength and the target magnetic field strength value, control the drive unit to drive the transmission unit to adjust the position of the magnetic conductive block to adjust the air gap magnetic field strength to the target magnetic field strength value.

9. The rotor assembly according to any one of claims 1 to 7, characterized in that: The first movable unit also includes a first fixed seat, which is fixedly connected to the rotor core. The first fixed seat is provided with a first bracket and a second bracket at two ends along the radial direction respectively. The first screw rod is movably connected to the first bracket and the second bracket.

10. The rotor assembly according to any one of claims 4 to 6, characterized in that: The second movable unit also includes a second fixed seat, which is fixedly connected to the rotor core. The second fixed seat is provided with a third bracket and a fourth bracket at two ends along the radial direction respectively, and the second screw rod is movably connected to the third bracket and the fourth bracket.

11. A permanent magnet synchronous motor, characterized in that: The invention comprises a stator assembly and a rotor assembly according to any one of claims 1 to 10.

12. A vehicle, characterized in that: The vehicle comprises a rotor assembly according to any one of claims 1 to 10 or a permanent magnet synchronous motor according to claim 11 .

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