Motor rotor and permanent magnet synchronous motor

Abstract

The utility model provides a motor rotor and a permanent magnet synchronous motor, which relate 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 is arranged with a gap between the outer peripheral surface of the rotor support; a magnetic isolation connector, the magnetic isolation connector includes a connector and a magnetic isolation member sleeved on the outer peripheral surface of the connector, the rotor support and the rotor pole are connected through the connector, and the magnetic isolation member is arranged between the rotor pole and the rotor support; wherein, at least part of the magnetic isolation member is a hollow structure. By applying the technical solution of the utility model, the amount of material used can be reduced through the hollow structure setting, thereby reducing the cost of the motor; the magnetic isolation connector can directly adopt the stretching forming process and standardized production, which can further reduce the processing and production costs; the volume of the hollow structure parts is reduced, the thermal stress of the overall parts is small, and the air gap uniformity is good.

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.10 and Fig.11 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 tangential force of the load torque on the rotor pole bolts acts on a tangent line rather than a surface, which greatly reduces the bolt's shear resistance. Fourth, the axial circulation ventilation effect is poor. When the rotor generates a lot of heat and the rotor bracket is not ventilated, the thermal stress deformation around the magnetic isolation sleeve will increase. After the motor is shut down multiple times, the rotor pole fixing bolts are prone to loosening, causing serious consequences such as bore sweeping.

[0006] There is no effective solution to the technical problems that the magnetic isolation sleeves require a lot of materials, are not conducive to batch stocking, and are easily deformed by thermal stress, causing the magnetic pole fixing bolts to loosen and cause bore sweeping. 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 problems in the prior art that the magnetic isolation sleeve uses a lot of materials, is not conducive to batch stocking, and the magnetic pole fixing bolts are easily loosened and cause bore sweeping after deformation due to thermal stress.

[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 is spaced apart from the outer circumferential surface of the rotor bracket; a magnetic isolation connector, the magnetic isolation connector comprises a connector and a magnetic isolation component sleeved on the outer circumferential surface of the connector, the rotor bracket and the rotor pole are connected via the connector, and the magnetic isolation component is disposed between the rotor pole and the rotor bracket; wherein, at least part of the magnetic isolation component is a hollow structure.

[0009] Furthermore, there are multiple magnetic isolation connectors, which are spaced apart along the circumferential direction of the rotor support.

[0010] Furthermore, the connecting member and the magnetic isolation member are detachably arranged.

[0011] Furthermore, the magnetic isolation member at least comprises a groove structure, a hole for the connecting member to pass through is provided at the bottom of the groove structure, and the bottom of the groove structure is connected to any one of the rotor bracket and the rotor pole.

[0012] Furthermore, the bottom of the groove structure is embedded in any one of the rotor support and the rotor pole, and the open end of the groove structure is embedded in the other one of the rotor support and the rotor pole.

[0013] Furthermore, a first flange structure is provided at the open end of the groove structure, and the first flange structure is extended in a direction away from the geometric center of the groove structure, and the first flange structure abuts against any one of the rotor bracket and the rotor pole.

[0014] Furthermore, the bottom of the groove structure is embedded in any one of the rotor support and the rotor pole, and the first flange structure is in contact with the other one of the rotor support and the rotor pole.

[0015] Furthermore, a second flange structure is provided on the outer peripheral surface of the end where the groove bottom of the groove structure is located, and the second flange structure is extended in a direction away from the geometric center of the groove structure.

[0016] Furthermore, each magnetic isolation connecting member comprises a plurality of magnetic isolation members spaced apart along the axial direction of the rotor support, and at least one connecting member is arranged on each magnetic isolation member.

[0017] Furthermore, each magnetic isolation connector includes a plurality of connectors and a magnetic isolation member, the length direction of the magnetic isolation member is arranged parallel to the axial direction of the rotor support, and the plurality of connectors are arranged at intervals along the length direction of the magnetic isolation member and connected to the magnetic isolation member.

[0018] 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.

[0019] By applying the technical solution of the utility model, the use of materials can be reduced through the hollow structure setting, thereby reducing the cost of the motor; the magnetic isolation connector can directly adopt the stretching forming process and standardized production, which can further reduce the processing and production costs; the volume of the hollow structure parts is reduced, the thermal stress of the overall parts is small, and the air gap uniformity is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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:

[0021] Figure 1A schematic structural diagram of a motor rotor according to a first embodiment of the utility model is shown;

[0022] Figure 2 A schematic structural diagram of a second embodiment of a motor rotor according to the utility model is shown;

[0023] Figure 3 A schematic structural diagram of a third embodiment of a motor rotor according to the utility model is shown;

[0024] Figure 4 A schematic structural diagram of a fourth embodiment of a motor rotor according to the utility model is shown;

[0025] Figure 5 A schematic structural diagram of a first embodiment of a magnetic shielding member for a motor rotor according to the utility model is shown;

[0026] Figure 6 A schematic structural diagram of a second embodiment of a magnetic shielding member for a motor rotor according to the utility model is shown;

[0027] Figure 7 A schematic structural diagram of a third embodiment of a magnetic shielding member for a motor rotor according to the utility model is shown;

[0028] Figure 8 A schematic structural diagram of a fifth embodiment of a motor rotor according to the utility model is shown;

[0029] Fig. 9 A schematic structural diagram of a sixth embodiment of a motor rotor according to the utility model is shown;

[0030] Fig.10 A schematic diagram showing the structure of a motor rotor of a permanent magnet synchronous motor in the prior art is shown;

[0031] Fig.11 A schematic diagram of a magnetic isolation structure of a motor rotor in the prior art is shown.

[0032] The above drawings include the following reference numerals:

[0033] 1. Rotor bracket;

[0034] 2. rotor magnetic pole; 21. magnetic pole; 22. magnetic steel;

[0035] 3. Magnetic isolation connector; 31. Connector; 32. Magnetic isolation part;

[0036] 320, groove structure; 321, through hole; 322, first flange structure; 323, second flange structure. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Combination Figures 1 to 9 As shown, according to a specific embodiment of the present application, a motor rotor is provided.

[0042] 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 is spaced apart from the outer circumferential surface of the rotor support 1; the magnetic isolation connector 3 includes a connector 31 and a magnetic isolation component 32 sleeved on the outer circumferential surface of the connector 31, the rotor support 1 is connected to the rotor pole 2 through the connector 31, and the magnetic isolation component 32 is disposed between the rotor pole 2 and the rotor support 1; wherein, at least part of the magnetic isolation component 32 is a hollow structure.

[0043] By applying the technical solution of this embodiment, the hollow structure can be set up to reduce the material usage and the cost of the motor; the magnetic isolation connector 3 can be directly produced by stretching process and standardized, which can further reduce the processing and production costs; the volume of the hollow structure parts is reduced, the thermal stress of the overall parts is small, and the air gap uniformity is good.

[0044] Specifically, Figure 1 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 pole 2 is guaranteed, improves the reliability of the motor rotor, and makes it difficult for the rotor bracket 1, the rotor pole 2 and the magnetic isolation connector 3 to fall off and be damaged.

[0045] In one embodiment of the present application, the connecting member 31 and the magnetic isolation member 32 are detachably arranged. In this way, different types of magnetic isolation members 32 can be selected and replaced according to actual needs during use, the modular structure can reduce the amount of materials used, and the standardized structure setting can facilitate stocking.

[0046] Furthermore, if Figure 5 As shown, the magnetic isolation member 32 at least includes a groove structure 320, and a through hole 321 for the connection member 31 to pass through is opened at the bottom of the groove structure 320, and the bottom of the groove structure 320 is connected to any one of the rotor support 1 and the rotor pole 2. In this way, the bottom of the groove structure 320 of the magnetic isolation member 32 is connected and fixed to any one of the rotor support 1 and the rotor pole 2 through the through hole 321, thereby improving the stability of the motor rotor.

[0047] Specifically, the bottom of the groove structure 320 is embedded in any one of the rotor support 1 and the rotor pole 2, and the open end of the groove structure 320 is embedded in the other one of the rotor support 1 and the rotor pole 2. In one embodiment of the present application, Figure 4 As shown, there are multiple magnetic isolation parts 32, the bottom of the groove structure 320 of the multiple magnetic isolation parts 32 is connected to the rotor bracket 1, and the other end of the magnetic isolation part 32 is connected to the rotor pole 2. The bottom of the groove structure 320 is connected to the rotor bracket 1 to increase the contact area between the magnetic isolation connector 3 and the rotor bracket 1 and enhance the connection stability.

[0048] Furthermore, if Figure 5As shown, the opening end of the groove structure 320 is provided with a first flange structure 322, and the first flange structure 322 is extended in a direction away from the geometric center of the groove structure 320, and the first flange structure 322 abuts against any one of the rotor support 1 and the rotor pole 2. The provision of the first flange structure 322 can increase the contact area between the opening end of the groove structure 320 and the rotor support 1 and the rotor pole 2, that is, enhance the stability of the connection between the opening end of the groove structure 320 and the rotor support 1 and the rotor pole 2.

[0049] Furthermore, if Figure 8 and Fig. 9 As shown, the bottom of the groove structure 320 is embedded in any one of the rotor bracket 1 and the rotor pole 2, and the first flange structure 322 abuts against the other of the rotor bracket 1 and the rotor pole 2. This arrangement enables the bottom of the groove structure 320 to be integrated with the rotor bracket 1 and the rotor pole 2, and at the same time, the first flange structure 322 abuts against the rotor bracket 1 and the rotor pole 2 to firmly connect the first flange structure 322 with the rotor bracket 1 and the rotor pole 2. When the motor rotor is working, the rotor bracket 1 drives the bottom of the groove structure 320 of the magnetic isolation member 32 or the open end of the groove structure 320 to transfer power to the rotor pole 2 for operation.

[0050] Furthermore, if Figure 6 and Figure 7 As shown, the outer peripheral surface of the end where the groove bottom of the groove structure 320 is located is provided with a second flange structure 323, and the second flange structure 323 is extended in a direction away from the geometric center of the groove structure 320. Such a configuration can further increase the contact area between the groove bottom of the groove structure 320 and the rotor support 1 or the rotor pole 2, that is, further improve the stability of the connection between the magnetic isolation member 32 and the rotor support 1 or the rotor pole 2.

[0051] Optionally, each magnetic isolation connector 3 includes a plurality of magnetic isolation members 32 spaced apart along the axial direction of the rotor bracket 1, and at least one connector 31 is disposed on each magnetic isolation member 32. By disposing a plurality of magnetic isolation members 32, the magnetic isolation effect can be enhanced, and the heat dissipation problem caused by the large volume of the magnetic isolation member 32 when using a whole magnetic isolation member 32 for magnetic isolation connection can be avoided. In particular, one connector 31 can be disposed on one magnetic isolation member 32, or two or three connectors 31 can be disposed on one magnetic isolation member 32.

[0052] Alternatively, if Figures 1 to 4As shown, each magnetic shielding connector 3 includes a plurality of connectors 31 and a magnetic shielding member 32. The length direction of the magnetic shielding member 32 is arranged in parallel with the axial direction of the rotor bracket 1. The plurality of connectors 31 are arranged at intervals along the length direction of the magnetic shielding member 32 and are connected to the magnetic shielding member 32. In this way, the connectors 31 and the magnetic shielding member 32 are evenly spaced and parallelly arranged along the circumferential surface of the rotor bracket 1. While ensuring that the magnetic shielding connector 3 evenly bears the shear stress of the motor rotor, the stability of the connection between the rotor bracket 1 and the rotor pole 2 can be ensured, the reliability of the motor rotor is improved, and the rotor bracket 1, the rotor pole 2 and the magnetic shielding connector 3 are not easy to fall off or be damaged.

[0053] In an exemplary 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 poles 21 and magnetic steels 22 alternately arranged along the circumference of the rotor pole 2, and the connecting member 31 is connected to the pole 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 alternating arrangement of the poles 21 and the magnetic steels 22 along the circumference of the rotor pole 2 can improve the stability and uniformity of the generated magnetic field, avoid magnetic leakage, improve the utilization rate of magnetic force, and reduce energy consumption.

[0054] 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.

[0055] The hollow structure of the magnetic isolation member 32 in the magnetic isolation connector 3 in the above embodiment is used to replace the magnetic isolation sleeve structure, which has the following beneficial effects: a) reducing the amount of magnetic isolation material used to reduce the cost of the motor; b) the magnetic isolation member 32 can be produced in a standardized manner to further reduce the processing cost; c) the hollow structure of the magnetic isolation member 32 reduces the mass of the magnetic isolation member 32, and at the same time, the volume of the entire part is reduced to reduce the thermal stress of the entire part; d) the hollow structure of the magnetic isolation member 32 is also provided with a through hole 321 to improve air permeability and improve air gap uniformity.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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 pole (2), wherein the rotor pole (2) is sleeved on the outer peripheral surface of the rotor support (1), and the rotor pole (2) and the outer peripheral surface of the rotor support (1) are arranged with a gap therebetween; A magnetic isolation connecting member (3), the magnetic isolation connecting member (3) comprising a connecting member (31) and a magnetic isolation member (32) sleeved on the outer peripheral surface of the connecting member (31), the rotor support (1) and the rotor magnetic pole (2) are connected via the connecting member (31), and the magnetic isolation member (32) is arranged between the rotor magnetic pole (2) and the rotor support (1); Wherein, at least part of the magnetic isolation member (32) is a hollow structure.

2. 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).

3. The motor rotor according to claim 1, characterized in that: The connecting member (31) and the magnetic isolation member (32) are detachably arranged.

4. The motor rotor according to claim 1, characterized in that: The magnetic isolation member (32) comprises at least a groove structure (320), the bottom of the groove structure (320) is provided with a penetration hole (321) for the connection member (31) to penetrate, and the bottom of the groove structure (320) is connected to any one of the rotor support (1) and the rotor pole (2).

5. The motor rotor according to claim 4, characterized in that: The bottom of the groove structure (320) is embedded in any one of the rotor support (1) and the rotor pole (2), and the open end of the groove structure (320) is embedded in the other one of the rotor support (1) and the rotor pole (2).

6. The motor rotor according to claim 4, characterized in that: The opening end of the groove structure (320) is provided with a first flange structure (322), and the first flange structure (322) is extended in a direction away from the geometric center of the groove structure (320), and the first flange structure (322) abuts against any one of the rotor support (1) and the rotor pole (2).

7. The motor rotor according to claim 6, characterized in that: The bottom of the groove structure (320) is embedded in any one of the rotor support (1) and the rotor pole (2), and the first flange structure (322) is in abutment with the other one of the rotor support (1) and the rotor pole (2).

8. The motor rotor according to claim 4, characterized in that: A second flange structure (323) is provided on the outer peripheral surface of the end where the groove bottom of the groove structure (320) is located, and the second flange structure (323) is extended in a direction away from the geometric center of the groove structure (320).

9. The motor rotor according to claim 1, characterized in that: Each of the magnetic isolation connecting members (3) comprises a plurality of magnetic isolation members (32) arranged at intervals along the axial direction of the rotor support (1), and at least one of the connecting members (31) is arranged on each of the magnetic isolation members (32).

10. The motor rotor according to claim 1, characterized in that: Each of the magnetic isolation connecting parts (3) comprises a plurality of connecting parts (31) and a magnetic isolation part (32); the length direction of the magnetic isolation part (32) is arranged parallel to the axial direction of the rotor support (1); the plurality of connecting parts (31) are arranged at intervals along the length direction of the magnetic isolation part (32) and are connected to the magnetic isolation part (32).

11. 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 1-10.

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