Permanent magnet motor rotor structure and permanent magnet motor

Abstract

The application relates to a permanent magnet motor rotor structure, which comprises a motor rotor mechanism coaxially arranged with a motor stator mechanism; the motor rotor mechanism comprises magnetically conductive blocks and magnetic steel blocks arranged along the same circumferential direction, the magnetically conductive blocks and the magnetic steel blocks are arranged in sequence and at intervals, the magnetic steel blocks are magnetized in a tangential flux-magnetic mode, and the magnetization directions of two adjacent magnetic steel blocks are opposite; the permanent magnet motor rotor structure of the application is provided with independent modular magnetically conductive blocks between adjacent magnetic steel blocks, the magnetically conductive blocks form a new short-path closed magnetic circuit together with the magnetic steel blocks and a rotor yoke part, the motor efficiency, the torque-current ratio and the magnetic steel loss performance of the structure are improved compared with those of a traditional SPM motor under the premise that the amount of the magnetic steel is equivalent; the problems of limited efficiency, large magnetic steel loss and bottleneck of torque density improvement of the traditional SPM motor are solved.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motors, and specifically to a permanent magnet motor rotor structure and a permanent magnet motor. Background Technology

[0002] Permanent magnet synchronous motors generate a rotating magnetic field by passing three-phase alternating current through the stator, and the rotor is excited by permanent magnets. They are widely used in new energy vehicle drive motors, industrial servo motors, air compressors / fans and pumps, home appliance compressors, rail transportation and other fields.

[0003] Currently, traditional surface-mounted SPM (permanent magnet synchronous motor) rotors have become the mainstream drive / generation solution for some new energy vehicles and industrial servo applications requiring low-speed, high-torque applications due to their advantages in high torque-to-current ratio, torque density, and motor efficiency. The traditional SPM structure is widely used in various torque motor / generator scenarios with basic requirements for medium and low speed and torque density due to its simple structure, mature technology, and controllable cost. It is one of the core technology routes in the current permanent magnet synchronous motor field. However, within the design boundaries of the rotor, it is difficult to overcome the technical bottlenecks of higher efficiency and higher torque density and high eddy current losses of rotor magnets.

[0004] Therefore, a permanent magnet motor rotor structure is needed to solve the above problems. Summary of the Invention

[0005] The permanent magnet motor rotor structure of the present invention adds an independent modular magnetic guide block between adjacent magnet blocks. The magnetic guide block, together with the magnet blocks and the rotor yoke, forms a new short-path closed magnetic circuit. Under the premise of equivalent magnet usage, the motor efficiency, torque-to-current ratio, and magnet loss performance of this structure are all improved compared with the traditional SPM motor. It solves the problems of limited efficiency, high magnet loss, and bottleneck in torque density improvement of the traditional SPM motor.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0007] A permanent magnet motor rotor structure includes a motor rotor mechanism arranged coaxially with the motor stator mechanism; the motor rotor mechanism includes magnetic guide blocks and magnetic steel blocks arranged along the same circumferential direction, the magnetic guide blocks and magnetic steel blocks are arranged in sequence at intervals, the magnetic steel blocks are magnetized by tangential magnetization, and the magnetization directions of adjacent magnetic steel blocks are opposite.

[0008] Furthermore, the cross-section of the magnetic steel block along the radial direction is an isosceles trapezoidal shape, and the cross-section of the magnetic conductive block along the radial direction is a fan-shaped ring. The magnetic steel block and the magnetic conductive block are fixedly connected to form a ring structure.

[0009] Furthermore, the magnetically conductive block protrudes outward in the radial direction along its outer circumference and forms a magnetically conductive protrusion, which protrudes beyond the outer circumference of the magnetic block.

[0010] Furthermore, the magnetic block has a protrusion forming an upper magnetic block retainer and a lower magnetic block retainer. The upper magnetic block retainer is formed on the outer circumference of the magnetic block and smoothly transitions to the edge of the magnetic protrusion. The lower magnetic block retainer protrudes from the inner circumference of the magnetic block and extends outward along the circumferential direction.

[0011] Furthermore, the upper locking blocks of the magnetic guide block are two blocks, and the two upper locking blocks of the magnetic guide block are symmetrically distributed with respect to the magnetic guide block; the lower locking blocks of the magnetic guide block are two blocks, and the two lower locking blocks of the magnetic guide block are symmetrically distributed with respect to the magnetic guide block.

[0012] Furthermore, the upper and lower locking blocks of the magnetic guide block are arranged "parallel" to each other, and the magnet is installed between the upper and lower locking blocks of the magnetic guide block.

[0013] Furthermore, the cross-section of the magnetic conductive block along the radial direction is generally triangular, and the cross-section of the magnetic steel block along the radial direction is generally triangular.

[0014] Furthermore, the cross-section of the magnetic conductive block along the radial direction is an isosceles trapezoidal shape, and the cross-section of the magnetic steel block along the radial direction is an isosceles body shape.

[0015] Furthermore, it also includes a rotor boundary mechanism, in which the magnetic guide block and the magnet block are arranged.

[0016] A permanent magnet motor adopts the aforementioned permanent magnet motor rotor structure.

[0017] The beneficial effects of this technical solution are:

[0018] The permanent magnet motor rotor structure of the present invention adds an independent modular magnetic guide block between adjacent magnet blocks. The magnetic guide block, together with the magnet blocks and the rotor yoke, forms a new short-path closed magnetic circuit. Under the premise of equivalent magnet usage, the motor efficiency, torque-to-current ratio, and magnet loss performance of this structure are all improved compared with the traditional SPM motor. It solves the problems of limited efficiency, high magnet loss, and bottleneck in torque density improvement of the traditional SPM motor. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall invention;

[0020] Figure 2 This is a schematic diagram showing the arrangement of the magnetic steel block and the magnetic conductive block of the present invention;

[0021] Figure 3 This is a schematic diagram of the magnetic conductive block of the present invention;

[0022] Figure 4 This is a schematic diagram of the second arrangement of the present invention;

[0023] Figure 5 This is a schematic diagram of the third arrangement of the present invention;

[0024] Figure 6 This is a schematic diagram of the fourth arrangement of the present invention;

[0025] Figure 7 This is a schematic diagram of the traditional structure.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 1-Motor rotor mechanism; 2-Motor stator mechanism; 3-Magnetic guide block; 4-Magnetic steel block; 5-Stator iron core; 6-Winding; 7-Rotor boundary mechanism; 8-Magnetic guide protrusion; 9-Magnetic guide block upper clamping block; 10-Magnetic guide block lower clamping block. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] like Figure 1-2As shown in Figure 4, in this embodiment of the application, a permanent magnet motor rotor structure includes a motor rotor mechanism 1 arranged coaxially with the motor stator mechanism 2; the motor rotor mechanism 1 includes magnetically conductive blocks 3 and magnetic steel blocks 4 arranged along the same circumferential direction, the magnetically conductive blocks 3 and magnetic steel blocks 4 are arranged alternately, and the magnetic steel blocks 4 are magnetized by tangential magnetization (tangential means the tangential direction of the circumference), and the magnetization directions of adjacent magnetic steel blocks are opposite (e.g., ...). Figure 1 The direction of the middle arrow indicates the opposite direction.

[0033] The stator mechanism 2 of this technical solution includes a stator core 5, windings 6, and other components (the arrangement of these structures can use existing technology and will not be elaborated here). The corresponding motor rotor mechanism 1 includes a magnetic guide block 3, a magnet block 4, and other internal structural components (the other components can use existing structures). An independent modular magnetic guide block 3 is added between adjacent magnet blocks 4. This magnetic guide block 3, together with the magnet blocks 4 and the rotor yoke, forms a new short-path closed magnetic circuit. Under the premise of a comparable amount of magnets (e.g., ...), this achieves this. Figure 6 Compared to the traditional SPM motor, this structure improves motor efficiency, torque-to-current ratio, and magnet loss performance; it also solves the problems of limited efficiency, high magnet loss, and bottleneck in torque density improvement in traditional SPM motors.

[0034] In this embodiment, the magnetic steel block 4 has an overall isosceles trapezoidal cross section along the radial direction, and the magnetic conductive block 3 has an overall fan-shaped cross section along the radial direction. The magnetic steel block 4 and the magnetic conductive block 3 are fixedly connected to form a ring structure.

[0035] like Figure 1-4 As shown, the magnetic block 4 is along the radial direction (i.e. Figure 1 The cross-section (perpendicular to the axial direction) of the magnetic block 3 is an isosceles trapezoid, while the cross-section of the magnetic block 3 in the radial direction is a fan-shaped ring. After the two are arranged continuously and alternately, they form a complete ring structure. Compared with the traditional structure, the amount of magnets required by this technical solution is greatly reduced for the same motor model. At the same time, compared with the traditional structure, the magnetic block 4 and the magnetic block 3 only require the structural space of one ring, which provides more installation space for other structural components. Compared with the traditional surface mount (SPM) and Halbach arrangement structure, the magnet arrangement structure of this solution can not only significantly improve the efficiency limit, high efficiency zone ratio and torque-to-current ratio limit of the traditional SPM, but also significantly reduce the problem of high magnet loss in the traditional SPM structure.

[0036] In this embodiment, the magnetic block 3 protrudes outward in the radial direction along the outer circumference and forms a magnetic protrusion 8, which protrudes outward in the outer circumference of the magnet block 4.

[0037] like Figure 2-3 As shown, the outer circumference of the magnetic block 3 protrudes outward in the radial direction to form the magnetic protrusion 8 structure. The maximum diameter of the magnetic protrusion 8 is greater than the maximum diameter of the magnet block 4. By adopting this protrusion structure, the sinusoidal nature of the air gap magnetic field is effectively improved, thereby reducing the high-order harmonics of the air gap magnetic flux density, improving NVH performance, and increasing efficiency.

[0038] In this embodiment, the magnetic block 3 has a protrusion forming an upper magnetic block locking block 9 and a lower magnetic block locking block 10. The upper magnetic block locking block 9 is formed on the outer circumference of the magnetic block 3 and is smoothly connected to the edge of the magnetic protrusion 8. The lower magnetic block locking block 10 protrudes from the inner circumference of the magnetic block 3 and extends outward along the circumferential direction.

[0039] like Figure 3 As shown, the magnetic block 3 has a protrusion forming an upper magnetic block locking block 9 and a lower magnetic block locking block 10. The upper magnetic block locking block 9 is formed after extending from the two end edges of the magnetic protrusion 8 in the circumferential direction. The upper magnetic block locking block 9 and the magnetic protrusion 8 can be connected by a smooth transition. The lower magnetic block locking block 10 can also be arranged in the same way.

[0040] In this embodiment, there are two upper locking blocks 9 on the magnetic guide block, and the two upper locking blocks 9 on the magnetic guide block are symmetrically distributed relative to the magnetic guide block 3. There are also two lower locking blocks 10 on the magnetic guide block, and the two lower locking blocks 10 on the magnetic guide block are symmetrically distributed relative to the magnetic guide block 3.

[0041] like Figure 3 As shown, the upper locking blocks 9 of the two magnetic blocks are arranged symmetrically relative to the magnetic blocks 3, and the lower locking blocks 10 of the corresponding magnetic blocks are also arranged symmetrically, which facilitates subsequent installation with the magnetic blocks 4.

[0042] In this embodiment, the upper locking block 9 and the lower locking block 10 of the magnetic guide block are arranged "parallel" to each other, and the magnetic steel block 4 is installed between the upper locking block 9 and the lower locking block 10 of the magnetic guide block.

[0043] like Figure 3 As shown, the upper locking block 9 and the lower locking block 10 of the magnetic guide block are arranged in a parallel manner. The edges are then fitted with the magnetic steel block 4 for positioning and installation, which improves the installation accuracy and efficiency of subsequent components.

[0044] In this embodiment, the cross-section of the magnetic block 3 along the radial direction is generally triangular, and the cross-section of the magnetic block 4 along the radial direction is generally triangular.

[0045] like Figure 5 As shown, the magnetic block 3 and the magnetic steel block 4 can be installed together with a triangular cross-section (integral structure) to form a complete ring structure after installation.

[0046] In this embodiment, the cross-section of the magnetic block 3 along the radial direction is an isosceles trapezoidal shape, and the cross-section of the magnetic block 4 along the radial direction is an isosceles body shape.

[0047] like Figure 5 As shown, the magnetic guide block 3 and the magnetic steel block 4 can be set up with a cross-section in the shape of an isosceles trapezoid (integral structure), and after subsequent installation, they form a complete ring structure.

[0048] In this embodiment, a rotor boundary mechanism 7 is also included, in which the magnetic guide block 3 and the magnetic steel block 4 are arranged.

[0049] like Figure 1 As shown, the motor rotor mechanism 1 also includes a rotor boundary mechanism 7, which is used to cooperate with the magnetic guide block 3 and the magnetic steel block 4 for installation. Of course, the existing structure can be used for the rotor boundary mechanism 7, which will not be described in detail here.

[0050] A permanent magnet motor adopts the aforementioned permanent magnet motor rotor structure.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0052] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A permanent magnet motor rotor structure, characterized in that: It includes a motor rotor mechanism (2) arranged coaxially with the motor stator mechanism (1); the motor rotor mechanism (2) includes magnetic guide blocks (3) and magnetic steel blocks (4) arranged along the same circumferential direction. The magnetic guide blocks (3) and magnetic steel blocks (4) are arranged in sequence at intervals. The magnetic steel blocks (4) are magnetized by tangential magnetization. The magnetization directions of two adjacent magnetic steel blocks (4) are opposite.

2. The permanent magnet motor rotor structure according to claim 1, characterized in that: The magnetic steel block (4) has an overall isosceles trapezoidal cross section along the radial direction, and the magnetic conductive block (3) has an overall fan-shaped ring cross section along the radial direction. The magnetic steel block (4) and the magnetic conductive block (3) are fixedly connected to form a ring structure.

3. The permanent magnet motor rotor structure according to claim 2, characterized in that: The magnetic block (3) protrudes outward in the radial direction along the outer circumference and forms a magnetic protrusion (8), which protrudes outward in the outer circumference of the magnetic block (3).

4. The permanent magnet motor rotor structure according to claim 3, characterized in that: The magnetic block (3) has a protrusion forming an upper magnetic block locking block (9) and a lower magnetic block locking block (10). The upper magnetic block locking block (9) is formed on the outer circumference of the magnetic block (3) and smoothly transitions to the edge of the magnetic protrusion (8). The lower magnetic block locking block (10) protrudes from the inner circumference of the magnetic block (3) and extends outward along the circumferential direction.

5. The permanent magnet motor rotor structure according to claim 4, characterized in that: The upper locking block (9) of the magnetic block consists of two blocks and the two upper locking blocks (9) of the magnetic block are symmetrically distributed with respect to the magnetic block (3). The lower locking block (10) of the magnetic block consists of two blocks and the two lower locking blocks (10) of the magnetic block are symmetrically distributed with respect to the magnetic block (3).

6. The permanent magnet motor rotor structure according to claim 5, characterized in that: The upper locking block (9) and the lower locking block (10) of the magnetic block are arranged "parallel" to each other, and the magnetic block (4) is installed between the upper locking block (9) and the lower locking block (10).

7. The permanent magnet motor rotor structure according to claim 1, characterized in that: The magnetic block (3) has a triangular cross-section along the radial direction, and the magnetic steel block (4) has a triangular cross-section along the radial direction.

8. The permanent magnet motor rotor structure according to claim 1, characterized in that: The magnetic block (3) has an overall isosceles trapezoidal cross section along the radial direction, and the magnetic steel block (4) has an overall isosceles body shape along the radial direction.

9. The permanent magnet motor rotor structure according to claim 1, characterized in that: It also includes a rotor boundary mechanism (7), in which the magnetic guide block (3) and the magnetic steel block (4) are arranged.

10. A permanent magnet motor, characterized in that: The permanent magnet motor rotor structure described in any one of claims 1 to 9 is adopted.

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