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 comprises: 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 comprises a connecting body and a connecting portion arranged on the outer peripheral surface of the connecting body, the rotor pole is connected to the rotor support through the connecting body, and the connecting portion is arranged between the rotor pole and the rotor support; wherein the connecting body and the connecting portion are integrally formed. By applying the technical solution of the utility model, the magnetic isolation connector replaces the entire magnetic isolation sleeve, which reduces the amount of magnetic isolation material used, makes it relatively easy to align the installation position, and makes the rotor installation more convenient. At the same time, it avoids the studs on the rotor support from being subjected to a large shear force, resulting in the bolts falling off or being damaged, and the electronic pole fixing bolts are easily loosened due to heat, resulting in the consequences of sweeping the bore.

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 Figure 6 and Figure 7 The main disadvantages of this magnetic isolation sleeve structure are:

[0003] First, due to the integral installation of the magnetic isolation sleeve, it is difficult to align the mounting holes on the rotor bracket with the mounting holes on the magnetic isolation sleeve, which makes it difficult to insert the connecting bolts between the two. The current common solution is to reserve a certain installation gap between the bolt mounting holes on the rotor bracket and the bolts. The existence of the gap causes the cylindrical surface of the bolt mounting hole on the rotor bracket to be in line contact with the cylindrical surface of the bolt instead of in surface contact. When the motor is in the action of starting, stopping or reversing the speed, the stud is subjected to a large shear force, which causes the bolt to fall off or be damaged.

[0004] Secondly, 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 increase. After the motor is shut down multiple times, the rotor pole fixing bolts will easily loosen, causing serious consequences such as bore scraping.

[0005] Third, the integral magnetic isolation sleeve makes it very difficult to align all the mounting holes when installing the rotor, which greatly complicates the rotor installation.

[0006] Currently, no effective solution has been proposed to the technical problem that the magnetic isolation sleeve is affected by thermal stress and shear force, resulting in complicated installation of the motor rotor and easy falling off and damage of the 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 problems in the prior art that the magnetic sleeve is affected by thermal stress and shear force, resulting in complex installation of the motor rotor and easy falling off and damage of the bolts.

[0008] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a motor rotor is provided, including: a rotor bracket; a rotor pole, the rotor pole is sleeved on the outer peripheral surface of the rotor bracket, and the rotor pole and the outer peripheral surface of the rotor bracket are arranged with a gap; a magnetic isolation connector, the magnetic isolation connector includes a connecting body and a connecting part arranged on the outer peripheral surface of the connecting body, the rotor pole is connected to the rotor bracket through the connecting body, and the connecting part is arranged between the rotor pole and the rotor bracket; wherein the connecting body and the connecting part are integrally formed.

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

[0010] Furthermore, along the radial direction of the magnetic isolation connector, the radial dimension of the connection portion is larger than the radial dimension of the connection body.

[0011] Furthermore, the connection body is connected to at least one of the rotor pole and the rotor bracket by threaded connection.

[0012] Furthermore, the rotor pole includes at least two pole segments independently arranged in sequence along the axial direction, each pole segment includes a plurality of poles and magnetic steels alternately arranged along the circumferential direction of the rotor pole, and the connecting body is connected to the pole.

[0013] Furthermore, a plurality of first mounting holes are provided on the outer circumferential surface of the rotor bracket, and a second mounting hole is provided on the inner circumferential surface of the magnetic pole facing the rotor bracket. The second mounting holes are arranged in one-to-one correspondence with the first mounting holes, and one end of the connecting body is connected to the corresponding magnetic pole through the second mounting hole, and the other end of the connecting body is connected to the rotor bracket through the corresponding first mounting hole.

[0014] Furthermore, two second mounting holes are formed on each magnetic pole, and the two second mounting holes are spaced apart along the axial direction of the magnetic pole.

[0015] Furthermore, the magnetic isolation connector is a studded step bolt, which includes a first threaded section, a step section, a fitting section and a second threaded section which are sequentially arranged along the axial direction, wherein the step section forms the connecting portion of the magnetic isolation connector, the studded step bolt is threadedly connected to the rotor pole through the first threaded section, the step section is located between the rotor bracket and the rotor pole, the studded step bolt is connected to the rotor bracket through the fitting section, the studded step bolt is connected to the fastening nut through the second threaded section, and the fastening nut is located on the side where the inner circumferential surface of the rotor bracket is located.

[0016] Furthermore, one side of the connecting portion abuts against the rotor bracket, and the other side of the connecting portion abuts against the rotor pole.

[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, the entire magnetic isolation sleeve is replaced by a magnetic isolation connector, which reduces the amount of magnetic isolation material used, makes it relatively easy to align the installation position, and makes the rotor installation more convenient. At the same time, it prevents the studs on the rotor bracket from being subjected to large shear forces that may cause the bolts to fall off or be damaged, and prevents the electronic pole fixing bolts from becoming loose due to heat, causing the bore to be swept, and other consequences. 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 diagram showing the structure of a motor rotor of a permanent magnet synchronous motor in the prior art is shown;

[0026] Figure 7 A schematic diagram of a magnetic isolation structure of a motor rotor in the prior art is shown.

[0027] The above drawings include the following reference numerals:

[0028] 1. rotor bracket; 100. first mounting hole;

[0029] 2. rotor magnetic pole; 210. second mounting hole; 21. magnetic pole; 22. magnetic steel;

[0030] 3. Magnetic isolation connector; 31. Connecting body; 32. Connecting part;

[0031] 4. Tighten the nut. DETAILED DESCRIPTION

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] Combination Figures 1 to 5 As shown, according to a specific embodiment of the present application, a motor rotor is provided.

[0037] Specifically, Figure 1 As shown, 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 circumference of the rotor support 1, and the rotor pole 2 is spaced apart from the outer circumference of the rotor support 1; the magnetic isolation connector 3 includes a connecting body 31 and a connecting portion 32 arranged on the outer circumference of the connecting body 31, the rotor pole 2 is connected to the rotor support 1 through the connecting body 31, and the connecting portion 32 is arranged between the rotor pole 2 and the rotor support 1; wherein the connecting body 31 and the connecting portion 32 are integrally formed.

[0038] By applying the technical solution of this embodiment, the entire magnetic isolation sleeve is replaced by three magnetic isolation connectors, which reduces the amount of magnetic isolation material used, makes it relatively easy to align the installation position, and makes the rotor installation more convenient. At the same time, it prevents the studs on the rotor bracket 1 from being subjected to large shear forces that may cause the bolts to fall off or be damaged, and prevents the electronic pole fixing bolts from loosening due to heat and causing the bore to be scraped.

[0039] Specifically, Figures 1 to 3 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.

[0040] Preferably, in an exemplary embodiment of the present application, a plurality of magnetic isolation connectors 3 are arranged at equal intervals along the circumference of the rotor bracket 1, so that the plurality of magnetic isolation connectors 3 are subjected to uniform force, thereby making the structure of the rotor bracket 1 and the rotor pole 2 more stable.

[0041] Furthermore, if Figure 4 As shown, along the radial direction of the magnetic isolation connector 3, the radial dimension of the connecting portion 32 is larger than the radial dimension of the connecting body 31. Since the connecting body 31 is inserted into the rotor bracket 1, and the connecting portion 32 is located between the rotor bracket 1 and the rotor pole 2, the shear force borne by the connecting portion 32 is greater. The radial dimension of the connecting portion 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, making the magnetic isolation connector 3 less likely to fall off and be damaged, thereby improving the reliability and stability of the motor rotor. At the same time, the difference in radial dimensions between the connecting portion 32 and the connecting body 31 can also be used to achieve rapid positioning and installation of the connecting portion 32.

[0042] Specifically, the connection body 31 is threadedly connected to at least one of the rotor pole 2 and the rotor bracket 1. This arrangement allows the magnetic isolation connector 3 to withstand higher torque and shear force, and can provide a more stable working environment for the motor rotor. At the same time, the threaded connection method has a simple structure, convenient operation, and low cost.

[0043] Preferably, threaded connections are used between the connecting body 31 and the rotor pole 2 , and between the connecting body 31 and the rotor bracket 1 , so as to improve the stability of the motor rotor.

[0044] It should be noted that if Figure 6 and Figure 7As shown, in the prior art, a magnetic pole segment is used to set the rotor pole 2, which has a large volume and mass, and will generate a large rotational inertia when the motor rotor rotates. The quality requirements for only setting one magnetic pole segment along the axial direction of the rotor pole 2 are high, the production cost is high, and the service life is short.

[0045] In one embodiment of the present application, Figures 1 to 3 As shown, the rotor pole 2 includes at least two pole segments which are independently arranged in sequence along the axial direction, each pole segment includes a plurality of poles 21 and magnetic steels 22 which are alternately arranged along the circumference of the rotor pole 2, and the connecting body 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.

[0046] Furthermore, if Figure 3 and Figure 5 As shown, a plurality of first mounting holes 100 are provided on the outer circumference of the rotor support 1, and a second mounting hole 210 is provided on the inner circumference of the magnetic pole 21 facing the rotor support 1. The second mounting holes 210 are arranged one-to-one with the first mounting holes 100. One end of the connecting body 31 is connected to the corresponding magnetic pole 21 through the second mounting hole 210, and the other end of the connecting body 31 is connected to the rotor support 1 through the corresponding first mounting hole 100. In this way, each magnetic isolation connector 3 is connected to a first mounting hole 100 and a second mounting hole 210, so that the rotor support 1 and the rotor magnetic pole 2 can be firmly connected, thereby improving the overall stability of the motor rotor.

[0047] Specifically, two second mounting holes 210 are formed on each magnetic pole 21, and the two second mounting holes 210 are spaced apart along the axial direction of the magnetic pole 21. Figure 3 As shown, two second mounting holes 210 are evenly distributed on one magnetic pole 21 and correspond to each first mounting hole 100 . This arrangement can evenly distribute the stress borne by the magnetic pole segment and improve the stability of the connection between the magnetic pole segment and the rotor bracket 1 .

[0048] Furthermore, if Figure 4As shown, the magnetic isolation connector 3 is a stud bolt, which includes a first thread segment, a step segment, a fitting segment and a second thread segment arranged in sequence along the axial direction, wherein the step segment forms the connecting portion 32 of the magnetic isolation connector 3, the stud bolt is threadedly connected to the rotor pole 2 through the first thread segment, the step segment is located between the rotor bracket 1 and the rotor pole 2, the stud bolt is connected to the rotor bracket 1 through the fitting segment, the stud bolt is connected to the fastening nut 4 through the second thread segment, and the fastening nut 4 is located on the side where the inner circumference of the rotor bracket 1 is located. This arrangement allows the stud bolt to completely replace the entire magnetic isolation sleeve, and the stud bolt is threadedly connected to the rotor bracket 1 and the rotor pole 2 through the step segment and the first thread segment, respectively, so that the entire stud surface bears the force caused by the change in rotor speed, reduces the shear stress borne by the stud, increases its shear resistance, and makes the bolt not easy to fall off and be damaged.

[0049] Those skilled in the art should understand that the fitting section of the stud-headed step bolt is the connecting body 31, and the step is the connecting portion 32. When in use, the fastening nut 4 is tightened so that the step is respectively abutted against the rotor bracket 1 and the rotor pole 2, that is, one side of the connecting portion 32 is abutted against the rotor bracket 1, and the other side of the connecting portion 32 is abutted against the rotor pole 2, thereby improving the stability of the motor rotor.

[0050] 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.

[0051] By adopting the stud-step bolt structure and installation method in the above embodiment, and the segmented arrangement of the magnetic poles along the axial direction, the permanent magnet synchronous motor can achieve the following technical effects:

[0052] 1) The stud-type stepped bolts are respectively connected to the rotor bracket 1 by threads, so that the entire stud surface bears the force caused by the change of rotor speed, reduces the shear stress borne by the stud, enhances its shear resistance, and makes the bolts not easy to fall off and be damaged.

[0053] 2) Reduce the amount of magnetic isolation material used.

[0054] 3) The rotor pole 2 is axially segmented, and there is no integral magnetic isolation sleeve in the rotor. The installation position alignment is relatively easy, and the rotor installation is more convenient.

[0055] 4) The axial and radial air circulation speeds are fast, which improves the cooling effect around the rotor pole permanent magnets and reduces the thermal deformation of the entire rotor.

[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 connector (3), the magnetic isolation connector (3) comprising a connection body (31) and a connection portion (32) arranged on the outer peripheral surface of the connection body (31), the rotor pole (2) and the rotor support (1) are connected via the connection body (31), and the connection portion (32) is arranged between the rotor pole (2) and the rotor support (1); Wherein, the connecting body (31) and the connecting portion (32) are integrally formed.

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: Along the radial direction of the magnetic isolation connector (3), the radial dimension of the connecting portion (32) is larger than the radial dimension of the connecting body (31).

4. The motor rotor according to claim 1, characterized in that: The connection body (31) is connected to at least one of the rotor pole (2) and the rotor bracket (1) by threaded connection.

5. The motor rotor according to any one of claims 1 to 4, characterized in that: The rotor pole (2) comprises at least two pole segments independently arranged in sequence along the axial direction, each of the pole segments comprises a plurality of poles (21) and magnetic steels (22) alternately arranged along the circumference of the rotor pole (2), and the connecting body (31) is connected to the pole (21).

6. The motor rotor according to claim 5, characterized in that: A plurality of first mounting holes (100) are provided on the outer circumferential surface of the rotor support (1), a second mounting hole (210) is provided on the inner circumferential surface of the magnetic pole (21) facing the rotor support (1), the second mounting holes (210) are arranged in one-to-one correspondence with the first mounting holes (100), one end of the connecting body (31) is connected to the corresponding magnetic pole (21) through the second mounting hole (210), and the other end of the connecting body (31) is connected to the rotor support (1) through the corresponding first mounting hole (100).

7. The motor rotor according to claim 6, characterized in that: Two second mounting holes (210) are provided on each of the magnetic poles (21), and the two second mounting holes (210) are arranged at intervals along the axial direction of the magnetic pole (21).

8. The motor rotor according to claim 1, characterized in that: The magnetic isolation connector (3) is a studded step bolt, and the studded step bolt comprises a first threaded section, a step section, a fitting section and a second threaded section arranged in sequence along the axial direction, wherein the step section forms the connecting portion (32) of the magnetic isolation connector (3), the studded step bolt is threadedly connected to the rotor pole (2) via the first threaded section, the step section is located between the rotor bracket (1) and the rotor pole (2), the studded step bolt is connected to the rotor bracket (1) via the fitting section, and the studded step bolt is connected to the fastening nut (4) via the second threaded section, and the fastening nut (4) is located on the side where the inner circumference of the rotor bracket (1) is located.

9. The motor rotor according to claim 1 or 8, characterized in that: One side of the connecting portion (32) abuts against the rotor support (1), and the other side of the connecting portion (32) abuts against the rotor pole (2).

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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