Motor rotor and permanent magnet synchronous motor

Abstract

The utility model provides a motor rotor and a permanent magnet synchronous motor, and relates to the technical field of motors. The motor rotor includes: a rotor support; a rotor pole, the rotor pole is sleeved on the outer peripheral surface of the rotor support, and the rotor pole and the outer peripheral surface of the rotor support are arranged at intervals; a magnetic isolation connector, the magnetic isolation connector includes a connecting body and a magnetic isolation block sleeved on the outer peripheral surface of the connecting body, the rotor pole and the support are connected through the connecting body, and the magnetic isolation block is arranged between the rotor pole and the rotor support; wherein the connecting body and the magnetic isolation block are detachably connected. Applying the technical solution of the utility model, by adopting a magnetic isolation connector to replace the magnetic isolation sleeve, the connecting body and the magnetic isolation block of the magnetic isolation connector can be detachably arranged, and different types of magnetic isolation blocks can be selected and replaced according to actual needs during use, the modular structure can reduce the material consumption, and the standardized structure setting can facilitate stocking.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a motor rotor and a permanent magnet synchronous motor. Background Art

[0002] At present, most conventional permanent magnet synchronous motors (especially permanent magnet motors with built-in tangential magnetic isolation sleeves) use magnetic isolation tubes with an axial length that is the same as or not much different from the core length (such as Fig.13 and Fig.14 The main disadvantages of this magnetic isolation sleeve structure are:

[0003] First, the amount of magnetic isolation material is large, which increases the weight and cost of the motor;

[0004] Second, the magnetic isolation structure is not conducive to batch stocking. Different core lengths have the same magnetic isolation or different magnetic isolation strips, which increases the variety of stocking;

[0005] Third, the axial circulation ventilation effect is poor. When the rotor generates high heat and the rotor bracket is not ventilated, the thermal stress deformation around the magnetic isolation sleeve will become larger. After the motor is shut down multiple times, the rotor pole fixing bolts will easily loosen, causing serious consequences such as bore scraping.

[0006] There is no effective solution to the technical problems that the material of the magnetic isolation sleeve is large and easily deformed by thermal stress, resulting in high weight and cost of the motor and easy loosening of the pole bolts. Utility Model Content

[0007] The main purpose of the utility model is to provide a motor rotor and a permanent magnet synchronous motor to solve the problem in the prior art that the magnetic isolation sleeve uses a large amount of material and is not conducive to batch stocking.

[0008] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a motor rotor is provided, comprising: a rotor bracket; a rotor pole, the rotor pole is sleeved on the outer circumferential surface of the rotor bracket, and the rotor pole and the outer circumferential surface of the rotor bracket are arranged at a distance; a magnetic isolation connector, the magnetic isolation connector comprises a connecting body and a magnetic isolation block sleeved on the outer circumferential surface of the connecting body, the rotor pole is connected to the bracket through the connecting body, and the magnetic isolation block is arranged between the rotor pole and the rotor bracket; wherein the connecting body and the magnetic isolation block are detachably connected.

[0009] Furthermore, along the radial direction of the magnetic isolation connector, the radial dimension of the magnetic isolation block is larger than the radial dimension of the connection body.

[0010] Furthermore, there are multiple magnetic isolation connectors, which are spaced apart along the circumferential direction of the rotor support.

[0011] Furthermore, the magnetic isolation block has a first mating surface facing the rotor bracket and a second mating surface facing the rotor pole. The first mating surface and the second mating surface are both arc surfaces. The first mating surface is fitted with the outer circumferential surface of the rotor bracket, and the second mating surface is fitted with the inner circumferential surface of the rotor bracket.

[0012] Furthermore, the magnetic isolation blocks include multiple types, and radial dimensions of different types of magnetic isolation blocks are set differently.

[0013] Furthermore, at least one end of the magnetic isolation block is embedded in the rotor pole or the rotor bracket.

[0014] Furthermore, one end of the magnetic isolation block abuts against the rotor pole, and the other end of the magnetic isolation block abuts against the rotor bracket.

[0015] Furthermore, the magnetic isolation block is any one of a cubic structure and a columnar structure.

[0016] Furthermore, the rotor pole includes a plurality of rotor cores and rotor magnets alternately arranged along the circumferential direction of the rotor pole, and the rotor core is connected to the rotor bracket through a plurality of connecting bodies.

[0017] According to another aspect of the present invention, a permanent magnet synchronous motor is provided. The permanent magnet synchronous motor includes a motor rotor, and the motor rotor is the above-mentioned motor rotor.

[0018] By applying the technical solution of the utility model, a magnetic isolation connector is adopted to replace the magnetic isolation sleeve. The connecting body of the magnetic isolation connector and the magnetic isolation block can be detachably arranged. When in use, different types of magnetic isolation blocks can be selected and replaced according to actual needs. The modular structure can reduce the material consumption, and the standardized structure setting can facilitate stocking. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 A schematic structural diagram of a motor rotor according to a first embodiment of the utility model is shown;

[0021] Figure 2 A schematic structural diagram of a second embodiment of a motor rotor according to the utility model is shown;

[0022] Figure 3 A schematic structural diagram of a third embodiment of a motor rotor according to the utility model is shown;

[0023] Figure 4 A schematic structural diagram of a fourth embodiment of a motor rotor according to the utility model is shown;

[0024] Figure 5 A schematic structural diagram of a fifth embodiment of a motor rotor according to the utility model is shown;

[0025] Figure 6 A schematic structural diagram of a first embodiment of a magnetic isolation connector for a motor rotor according to the utility model is shown;

[0026] Figure 7 A schematic structural diagram of a second embodiment of a magnetic isolation connector for a motor rotor according to the utility model is shown;

[0027] Figure 8 A schematic structural diagram of a third embodiment of a magnetic isolation connector for a motor rotor according to the utility model is shown;

[0028] Fig. 9 A schematic structural diagram of a fourth embodiment of a magnetic isolation connector for a motor rotor according to the utility model is shown;

[0029] Fig.10 A schematic structural diagram of a fifth embodiment of a magnetic isolation connector for a motor rotor according to the utility model is shown;

[0030] Fig.11 A schematic structural diagram of a sixth embodiment of a motor rotor according to the utility model is shown;

[0031] Fig.12 A schematic structural diagram of a seventh embodiment of a motor rotor according to the utility model is shown;

[0032] Fig.13 A schematic diagram showing the structure of a motor rotor of a permanent magnet synchronous motor in the prior art is shown;

[0033] Fig.14 A schematic diagram of a magnetic isolation structure of a motor rotor in the prior art is shown.

[0034] The above drawings include the following reference numerals:

[0035] 1. Rotor bracket;

[0036] 2. rotor pole; 21. rotor core; 22. rotor magnetic steel;

[0037] 3. Magnetic isolation connector;

[0038] 31. Connect the main body;

[0039] 32. Magnetic isolation block; 321. First mating surface; 322. Second mating surface. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0044] Combination Figures 1 to 12 As shown, according to a specific embodiment of the present application, a motor rotor is provided.

[0045] Specifically, the motor rotor includes a rotor support 1, a rotor pole 2 and a magnetic isolation connector 3; the rotor pole 2 is sleeved on the outer circumferential surface of the rotor support 1, and the rotor pole 2 and the outer circumferential surface of the rotor support 1 are arranged at a distance; the magnetic isolation connector 3 includes a connecting body 31 and a magnetic isolation block 32 sleeved on the outer circumferential surface of the connecting body 31, the rotor pole 2 is connected to the rotor support 1 through the connecting body 31, and the magnetic isolation block 32 is arranged between the rotor pole 2 and the rotor support 1; wherein the connecting body 31 and the magnetic isolation block 32 are detachably connected.

[0046] By applying the technical solution of this embodiment, a magnetic isolation connector 3 is adopted to replace the magnetic isolation sleeve. The connecting body 31 of the magnetic isolation connector 3 and the magnetic isolation block 32 are detachable. When in use, different types of magnetic isolation blocks 32 can be selected and replaced according to actual needs. The modular structure can reduce material consumption, and the standardized structure setting can facilitate stocking.

[0047] Furthermore, if Figure 3 and Figure 4 As shown, along the radial direction of the magnetic isolation connector 3, the radial dimension of the magnetic isolation block 32 is larger than the radial dimension of the connecting body 31. Since the connecting body 31 is inserted into the rotor support 1 and the rotor pole 2, and the magnetic isolation block 32 is located between the rotor support 1 and the rotor pole 2, the shear force borne by the magnetic isolation block 32 is greater. The radial dimension of the magnetic isolation block 32 is larger than the radial dimension of the connecting body 31, which can enhance the shear force resistance of the magnetic isolation connector 3, make the magnetic isolation connector 3 not easy to fall off and be damaged, and improve the reliability and stability of the motor rotor.

[0048] Specifically, Figures 1 to 4 As shown, there are multiple magnetic isolation connectors 3, and the multiple magnetic isolation connectors 3 are arranged at intervals along the circumference of the rotor bracket 1. In this way, the magnetic isolation connectors 3 are evenly arranged at intervals along the circumferential surface of the rotor bracket 1, which ensures that the magnetic isolation connectors 3 evenly bear the shear stress of the motor rotor, and at the same time ensures that the stability of the connection between the rotor bracket 1 and the rotor magnetic pole 2 is guaranteed, improves the reliability of the motor rotor, and makes it difficult for the rotor bracket 1, the rotor magnetic pole 2 and the magnetic isolation connector 3 to fall off and be damaged.

[0049] In one embodiment of the present application, Figure 6 and Figure 7As shown, the magnetic isolation block 32 has a first mating surface 321 facing the rotor support 1 and a second mating surface 322 facing the rotor pole 2. The first mating surface 321 and the second mating surface 322 are both arc surfaces. The first mating surface 321 is arranged to fit the outer circumference of the rotor support 1, and the second mating surface 322 is arranged to fit the inner circumference of the rotor support 1. In this way, the magnetic isolation block 32 is designed with the curvature of the first mating surface 321 and the second mating surface 322 according to the curvature of the circumference of the rotor support 1 and the rotor pole 2, and the two are matched, so as to avoid incomplete contact and gaps between the magnetic isolation block 32 and the rotor support 1 and the rotor pole 2, thereby improving the stability and reliability of the motor rotor.

[0050] Specifically, the magnetic isolation block 32 includes multiple types, and the radial sizes of different types of magnetic isolation blocks 32 are set differently. In this way, different magnetic isolation blocks 32 can be used according to motor rotors of different sizes. The modular structure of the magnetic isolation block 32 can reduce the amount of materials used, and the standardized structure setting can facilitate stocking.

[0051] Specifically, Fig.11 As shown, at least one end of the magnetic isolation block 32 is embedded in the rotor pole 2 or the rotor bracket 1. This can ensure the stable connection between the rotor bracket 1 and the rotor pole 2, the stable transfer of the moment of inertia, and improve the stability of the motor rotor. Preferably, the two ends of the magnetic isolation block 32 are respectively embedded in the rotor pole 2 and the rotor bracket 1; or, the first end of the magnetic isolation block 32 is embedded in the rotor pole 2, and the second end of the magnetic isolation block 32 passes through the rotor bracket 1 to further improve the stability of the motor rotor.

[0052] One end of the magnetic isolation block 32 abuts against the rotor pole 2, and the other end of the magnetic isolation block 32 abuts against the rotor bracket 1. This arrangement allows the first mating surface 321 and the second mating surface 322 of the magnetic isolation block 32 to fit tightly with the rotor bracket 1 and the rotor pole 2, respectively, thereby improving the stability of the motor rotor.

[0053] Furthermore, if Figures 8 to 10 As shown, the magnetic isolation block 32 is any one of a cubic structure and a columnar structure. The magnetic isolation blocks 32 of different shapes and structures can improve their adaptability to motor rotors of different sizes and structures, and the modular structure reduces assembly operations and improves efficiency.

[0054] Furthermore, the rotor pole 2 includes a plurality of rotor cores 21 and rotor magnetic steels 22 alternately arranged along the circumference of the rotor pole 2, and the rotor core 21 is connected to the rotor bracket 1 through a plurality of connecting bodies 31. Such an arrangement can improve the strength of each magnetic pole, reduce the stress on the magnetic pole segment with a smaller volume and mass, and improve the shear and tensile strength; the rotor core 21 and the rotor magnetic steel 22 are alternately arranged along the circumference of the rotor pole 2 to improve the stability and uniformity of the generated magnetic field, avoid magnetic leakage, improve the utilization rate of magnetic force, and reduce energy consumption.

[0055] It should be noted that if Fig.13 and Fig.14 As shown, the magnetic isolation structure adopted by the motor rotor of the permanent magnet synchronous motor in the prior art adopts a unified magnetic isolation cylinder with a large volume and mass, which will generate a large rotational inertia when the motor rotor rotates. It has high quality requirements for only one magnetic pole segment along the axial direction of the rotor magnetic pole 2, high production cost, and short service life.

[0056] The magnetic isolation connector 3 in the present application has the following advantages: a. Modularization reduces material consumption; b. Standardization facilitates stocking; c. Improves heat dissipation effect; d. The overall parts have low thermal stress and good air gap uniformity.

[0057] In one embodiment of the present application, the rotor pole 2 includes at least two pole segments independently arranged in sequence along the axial direction, each pole segment includes a plurality of rotor cores 21 and rotor magnetic steels 22 alternately arranged along the circumferential direction of the rotor pole 2, and the connecting body 31 is connected to the rotor core 21. Such an arrangement can improve the strength of each pole segment, reduce the stress on the pole segment with a smaller volume and mass, and improve the shear and tensile strength; the rotor core 21 and the rotor magnetic steel 22 are alternately arranged along the circumferential direction of the rotor pole 2 to improve the stability and uniformity of the generated magnetic field, avoid magnetic leakage, improve the utilization rate of magnetic force, and reduce energy consumption.

[0058] According to another specific embodiment of the present application, a permanent magnet synchronous motor is further provided, the permanent magnet synchronous motor comprises a motor rotor, and the motor rotor is the motor rotor in the above embodiment. Preferably, the permanent magnet synchronous motor is an internal tangential permanent magnet synchronous motor.

[0059] In this embodiment, permanent magnet synchronous motors with the same frame number but different core lengths can use magnetic isolation blocks 32 of the same specification to support rotor poles 2, and the spacing between adjacent magnetic isolation blocks 32 is relatively large. The motor rotor and permanent magnet synchronous motor in this embodiment have the following beneficial effects:

[0060] 1) The use of axially segmented and spaced magnetic isolation blocks 32 can reduce the amount of magnetic isolation material used, thereby reducing the weight and cost of the motor.

[0061] 2) The same specification of modular magnetic isolation blocks 32 is used for the same frame size, which reduces the types and quantities of stock.

[0062] 3) The axial and radial air circulation speeds between the magnetic isolation blocks 32 are relatively fast, which improves the cooling effect around the permanent magnets of the rotor poles and reduces the thermal deformation of the entire rotor.

[0063] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0064] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present utility model.

[0065] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0066] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A motor rotor, characterized in that: include: Rotor support (1); A rotor magnetic pole (2), wherein the rotor magnetic pole (2) is sleeved on the outer peripheral surface of the rotor support (1), and the rotor magnetic pole (2) and the outer peripheral surface of the rotor support (1) are arranged with a gap; A magnetic isolation connector (3), the magnetic isolation connector (3) comprising a connection body (31) and a magnetic isolation block (32) sleeved on the outer peripheral surface of the connection body (31), the rotor magnetic pole (2) and the rotor support (1) are connected via the connection body (31), and the magnetic isolation block (32) is arranged between the rotor magnetic pole (2) and the rotor support (1); Wherein, the connecting body (31) is detachably connected to the magnetic isolation block (32).

2. The motor rotor according to claim 1, characterized in that: Along the radial direction of the magnetic isolation connecting member (3), the radial dimension of the magnetic isolation block (32) is larger than the radial dimension of the connecting body (31).

3. The motor rotor according to claim 1, characterized in that: There are a plurality of magnetic isolation connectors (3), and the plurality of magnetic isolation connectors (3) are arranged at intervals along the circumference of the rotor support (1).

4. The motor rotor according to claim 1, characterized in that: The magnetic isolation block (32) has a first mating surface (321) facing the rotor support (1) and a second mating surface (322) facing the rotor pole (2); the first mating surface (321) and the second mating surface (322) are both arc surfaces; the first mating surface (321) is arranged to fit the outer circumferential surface of the rotor support (1), and the second mating surface (322) is arranged to fit the inner circumferential surface of the rotor support (1).

5. The motor rotor according to claim 1, characterized in that: The magnetic isolation blocks (32) include multiple types, and the radial dimensions of the magnetic isolation blocks (32) of different types are set differently.

6. The motor rotor according to claim 1, characterized in that: At least one end of the magnetic isolation block (32) is embedded in the rotor pole (2) or the rotor bracket (1).

7. The motor rotor according to claim 1, characterized in that: One end of the magnetic isolation block (32) abuts against the rotor pole (2), and the other end of the magnetic isolation block (32) abuts against the rotor bracket (1).

8. The motor rotor according to claim 1, characterized in that: The magnetic isolation block (32) is any one of a cubic structure and a columnar structure.

9. The motor rotor according to claim 1, characterized in that: The rotor magnetic pole (2) comprises a plurality of rotor cores (21) and rotor magnetic steels (22) alternately arranged along the circumferential direction of the rotor magnetic pole (2); the rotor core (21) is connected to the rotor bracket (1) via a plurality of connecting bodies (31).

10. A permanent magnet synchronous motor, characterized in that: The permanent magnet synchronous motor comprises a motor rotor, and the motor rotor is the motor rotor according to any one of claims 1-9.

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