Permanent magnet synchronous motor and rotor thereof

Abstract

The utility model relates to a permanent magnet synchronous motor and a rotor thereof. The rotor comprises a rotor core configured to rotate about a rotor axis, the rotor core comprising an intermediate lamination stack and two end lamination stacks, the intermediate lamination stack being arranged between the two end lamination stacks; rotor slots are formed in the end part lamination group; and a material missing part for correcting the dynamic balance of the rotor is arranged between magnetic poles formed by the adjacent rotor slots. The utility model provides a motor and a rotor thereof, which can effectively reduce the weight and cost of the whole structure.

Description

Technical Field

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

[0002] Figure 1 The schematic diagram of the structure of the rotor core of the prior art is shown. As shown in the figure, the rotor core 100 of the prior art generally includes a middle lamination 101 and end plates 102 arranged at both ends of the middle lamination 101. The middle lamination 101 is composed of a plurality of rotor laminations stacked along the axis of the rotor core. The end plates 102 are fixed to the two ends of the middle lamination 101 by screws 103, and the end plates 102 and the middle lamination 101 form a stable structure of the rotor core 100. The end plates 102 are also used to provide dynamic balance for the rotor core 100. Utility Model Content

[0003] In view of the above problems in the prior art, the utility model proposes a permanent magnet synchronous motor and a rotor thereof, in which the end plates are eliminated, thereby effectively reducing the weight and cost of the overall structure.

[0004] Specifically, the utility model proposes a rotor for a permanent magnet synchronous motor, the rotor comprising a rotor core configured to rotate around the rotor axis, the rotor core comprising:

[0005] A middle lamination stack and two end lamination stacks, wherein the middle lamination stack is arranged between the two end lamination stacks;

[0006] The end lamination stack is provided with rotor slots, and between the magnetic poles formed by adjacent rotor slots there is a material missing portion for correcting the dynamic balance of the rotor.

[0007] According to an embodiment of the present invention, the missing material portion is located on the Q axis of the rotor and is symmetrically arranged along the Q axis.

[0008] According to an embodiment of the present invention, the material missing portion is located between 1 / 4 and 3 / 4 of the radial length of the end lamination stack.

[0009] According to an embodiment of the present invention, the middle lamination group and the end lamination group are formed by stacking a plurality of rotor laminations.

[0010] According to an embodiment of the present invention, each of the rotor laminations is made of the same material and has the same thickness.

[0011] According to an embodiment of the present invention, the radius of the rotor laminations constituting the middle lamination group is the same, and the radius of at least one rotor lamination in each of the end lamination groups is greater than the radius of the middle lamination group.

[0012] According to an embodiment of the present invention, the radius of at least one of the rotor laminations in each of the end lamination groups is greater than the radius of the middle lamination group, and the difference between the radii is 1-2 mm.

[0013] According to an embodiment of the present invention, a carbon fiber protective layer is wrapped around the periphery of the middle lamination group.

[0014] According to an embodiment of the present invention, the carbon fiber protective layer is located between the two end lamination groups.

[0015] According to an embodiment of the utility model, the adjacent rotor laminations of the middle lamination group and the end lamination group are axially connected and fixed, and the connection and fixing method can be one or more of rivet point connection, buckle point connection or glue point bonding.

[0016] According to an embodiment of the utility model, the middle lamination group and the end lamination group are axially connected and fixed, and the connection and fixing method can be one of rivet point connection, buckle point connection or glue point bonding, or screw fixation.

[0017] According to an embodiment of the present invention, the rotor laminations are made of silicon steel sheets.

[0018] According to an embodiment of the present invention, the material strength of the end lamination stack is greater than the material strength of the middle lamination stack.

[0019] The utility model also provides a permanent magnet synchronous motor, comprising the above-mentioned rotor.

[0020] The utility model provides a permanent magnet synchronous motor and a rotor thereof, which changes the rotor structure and replaces the end plate in the prior art by an end lamination group, thereby effectively reducing the overall structure weight and cost.

[0021] It should be understood that the above general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are included to provide a further understanding of the present invention, and they are included and constitute a part of this application. The accompanying drawings illustrate embodiments of the present invention and together with this specification serve to explain the principles of the present invention. In the accompanying drawings:

[0023] Figure 1 A schematic structural diagram of a rotor core in the prior art is shown.

[0024] Figure 2 The figure shows a schematic structural diagram of a rotor according to an embodiment of the utility model.

[0025] Figure 3 The schematic diagram of the structure of the end lamination group and the stator of one embodiment of the utility model is shown.

[0026] The above drawings include the following reference numerals:

[0027] Rotor core 100, 200

[0028] Middle lamination 101

[0029] End plate 102

[0030] Screw 103

[0031] Middle lamination group 201

[0032] End lamination stack 202

[0033] Rotor slot 203

[0034] Missing Materials Department 204

[0035] Carbon fiber protective layer 205

[0036] Processing area 206

[0037] Stator 301 DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0040] 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.

[0041] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0042] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0043] 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.

[0044] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0045] Figure 2 The figure shows a schematic structural diagram of a rotor according to an embodiment of the utility model. Figure 3 The schematic diagram of the structure of the end lamination stack and the stator of an embodiment of the utility model is shown. As shown in the figure, the utility model provides a rotor for a permanent magnet synchronous motor. The rotor includes a rotor core 200 configured to rotate around a rotor axis. The rotor core 200 includes:

[0046] The middle lamination stack 201 and two end lamination stacks 202 , the middle lamination stack 201 being arranged between the two end lamination stacks 202 .

[0047] The end lamination stack 202 is provided with rotor slots 203. Between the magnetic poles formed by the adjacent rotor slots 203, there is a material missing portion 204 for correcting the dynamic balance of the rotor.

[0048] The difference between the rotor core 200 provided by the present invention and the rotor core 100 of the prior art is that the end plates 102 at both ends of the rotor core 200 are eliminated, and the end lamination stack 202 replaces the dynamic balancing function of the end plates 102, so that the end plates 102 can be eliminated, reducing the overall weight and cost of the rotor core 200. Specifically, the material missing portion 204 is used to correct the dynamic balance of the rotor, and the material missing portion 204 is located between adjacent magnetic poles of the end lamination stack 202.

[0049] Furthermore, for Figure 3In the illustrated eight-pole rotor core structure, the stator 301 is arranged coaxially around the rotor core 200 at intervals. The center angle covered by each pole of the end lamination group 202 of the rotor core 200 is 45°, and the material missing portion 204 is arranged between the poles spaced 45° circumferentially on the surface of the end lamination group 202. It is easy to understand that for a twelve-pole rotor core, the center angle covered by each pole is 30°, and the material missing portion 204 is arranged between the poles spaced 30° circumferentially on the surface of the end lamination group 202. This arrangement allows the material missing portion 204 to have flexibility in selection in terms of position and quantity. That is to say, according to the actual dynamic balancing calculation, the material missing portion 204 can be unevenly distributed in the circumferential direction of the end lamination group 202, and the sizes of the material missing portions 204 at different positions can be inconsistent.

[0050] Conventionally, after the rotor core 200 has been assembled and tested for balance around its rotation axis, a material missing portion 204 is selectively formed on the end lamination stack 202 by calculation, so that the finally assembled rotor core 200 has balanced performance. The material missing portion 204 may be a through hole or a blind hole formed on the end lamination stack 202, and may be formed by stamping, cutting or other processing methods. Figure 3 The oval surrounded by the dotted line shown in the figure is a processing area 206 of the material missing portion 204. The processing area 206 is suitable for processing to form the material missing portion 204. The end lamination stack 202 usually has a certain thickness so that the material missing portion 204 has the flexibility of selection in terms of depth. In general, the end lamination stack 202 has the balanced performance of the end plate, so that it can effectively replace the end plate 102 in the traditional manner.

[0051] Preferably, the missing material portion 204 is located on the Q axis of the rotor and is symmetrically arranged along the Q axis. The Q axis is located on the perpendicular bisector between two adjacent magnetic poles and passes through the processing area 206. Such arrangement of the missing material portion 204 can effectively reduce the influence of the missing material portion 204 on the symmetrically distributed magnetic field.

[0052] Preferably, the missing material portion 204 is located between 1 / 4 and 3 / 4 of the radial length L of the end lamination stack 202 , so as to further reduce the influence of the missing material portion 204 on the symmetrically distributed magnetic field.

[0053] Preferably, the middle lamination group 201 and the end lamination group 202 are formed by stacking a plurality of rotor laminations. More preferably, each rotor lamination is made of the same material and has the same thickness. The middle lamination group 201 formed by the plurality of rotor laminations has a first axial length, and the end lamination group 202 formed by the plurality of rotor laminations has a second axial length. The first axial length is generally greater than the second axial length. The axial lengths of the two end lamination groups 202 at both ends of the middle lamination group 201 are substantially equal.

[0054] Preferably, the rotor laminations constituting the middle lamination group 201 have the same radius, and the radius of at least one rotor lamination in each end lamination group 202 is larger than the radius of the middle lamination group 201. More preferably, the difference between the two radii is 1-2 mm.

[0055] Preferably, a carbon fiber protective layer 205 is wrapped around the periphery of the middle lamination group 201 , so that the overall structure of the middle lamination group 201 is more stable, which is beneficial to improving the rotation speed of the middle lamination group 201 .

[0056] Preferably, the carbon fiber protective layer 205 is located between the two end lamination groups 202. Specifically, starting from the rotor laminations with a radius greater than that of the middle lamination group 201 in the end lamination group 202, the carbon fiber protective layer 205 is wound toward the middle lamination group 201, and finally the carbon fiber protective layer 205 fills the periphery of the middle lamination group 201 located between the rotor laminations with a larger radius in the two end lamination groups 202. The radius of the carbon fiber protective layer 205 is equivalent to the radius of the rotor laminations with a larger radius in the end lamination group 202, forming an overall stable structure of the middle lamination group 201 and the end lamination group 202, so as to further increase the rotation speed of the rotor core 200.

[0057] Preferably, adjacent rotor laminations of the middle lamination group 201 and the end lamination group 202 are axially connected and fixed. The connection and fixing method can be one or more of rivet point connection, buckle point connection or glue point bonding. Specifically, the axial connection and fixing between the rotor laminations allows the rotor laminations to be stacked or interlocked. The rotor laminations are riveted, snapped or glued to avoid the occurrence of rotor lamination deflection or warping when the rotor core 200 is working.

[0058] Preferably, the middle lamination group 201 and the end lamination group 202 are axially connected and fixed. The connection and fixing method can be one of rivet point connection, buckle point connection or glue point bonding, or screw fixing. In other words, the connection method between the middle lamination group 201 and the end lamination group 202 is basically the same as the connection method between the rotor laminations. The middle lamination group 201 and the end lamination group 202 can also adopt the fixing method of the end plate 102 in the prior art, that is, using screws, along the axis from the outside of the end lamination group 202 into the mounting hole on the end lamination group 202 and docking with the mounting hole at the end of the middle lamination group 201 to form a stable structure.

[0059] Preferably, the rotor laminations are made of silicon steel sheets. By way of example and not limitation, the rotor laminations may be made of aluminum or other metal materials. In this embodiment, silicon steel sheets are preferred. Silicon steel sheets are important materials in the field of power transmission and conversion, and have the following advantages: they have high magnetic permeability and low magnetic loss, which reduces energy loss during power transmission and conversion; they can effectively reduce transmission energy loss, improve motor operating efficiency, and reduce motor heating and noise; they can resist acid-base erosion and oxidative corrosion, ensuring the service life of the motor; they can be recycled and reused to reduce pollution to the environment.

[0060] Preferably, the material strength of the end lamination group 202 is greater than the material strength of the middle lamination group 201. The advantage of this structure is that the maximum rotational speed of the end lamination group 202 and the maximum rotational speed of the middle lamination group 201 tend to be consistent, thereby improving the overall performance of the rotor core 200. More preferably, weight-reducing holes are provided on the end lamination group 202 and / or the middle lamination group 201 to further reduce the weight of the rotor core 200. It should be noted that the weight-reducing holes are evenly distributed along the circumferential position, and each weight-reducing hole is of the same size. The weight-reducing holes provided on the end lamination group 202 and the material missing portion 204 may overlap, be staggered, or be independent of each other. The utility model also provides a permanent magnet synchronous motor, which includes the aforementioned rotor.

[0061] The utility model provides a permanent magnet synchronous motor and a rotor thereof, which changes the rotor structure and cancels the end plate, thereby effectively reducing the overall structure weight and cost.

[0062] It will be apparent to those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the present invention without departing from the spirit and scope of the present invention. Therefore, it is intended that the present invention covers modifications and variations of the present invention that fall within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A rotor for a permanent magnet synchronous motor, the rotor comprising a rotor core configured to rotate about the rotor axis, It is characterized in that The rotor core comprises: A middle lamination stack and two end lamination stacks, wherein the middle lamination stack is arranged between the two end lamination stacks; The end lamination stack is provided with rotor slots, and between the magnetic poles formed by adjacent rotor slots there is a material missing portion for correcting the dynamic balance of the rotor.

2. The rotor according to claim 1, It is characterized in that The material missing portion is located on the Q axis of the rotor and is symmetrically arranged along the Q axis.

3. The rotor according to claim 2, It is characterized in that The missing material portion is located between 1 / 4 and 3 / 4 of the radial length of the end lamination stack.

4. The rotor according to claim 1, It is characterized in that The middle lamination stack and the end lamination stack are formed by stacking a plurality of rotor laminations.

5. The rotor according to claim 4, It is characterized in that Each of the rotor laminations is made of the same material and has the same thickness.

6. The rotor according to claim 4, It is characterized in that The rotor laminations constituting the middle lamination group have the same radius, and the radius of at least one rotor lamination in each of the end lamination groups is greater than the radius of the middle lamination group.

7. The rotor according to claim 6, It is characterized in that The radius of at least one of the rotor laminations in each of the end lamination groups is greater than the radius of the middle lamination group, and the difference between the radii is 1 to 2 mm.

8. The rotor according to claim 6, It is characterized in that A carbon fiber protective layer is wrapped around the periphery of the middle lamination group.

9. The rotor according to claim 8, It is characterized in that The carbon fiber protective layer is located between the two end lamination stacks.

10. The rotor according to claim 4, It is characterized in that The adjacent rotor laminations of the middle lamination group and the end lamination group are axially connected and fixed, and the connection and fixing method can be one or more of rivet point connection, buckle point connection or glue point bonding.

11. The rotor according to claim 4, It is characterized in that The middle lamination group and the end lamination group are axially connected and fixed, and the connection and fixing method can be one of rivet point connection, buckle point connection or glue point bonding, or screw fixation.

12. The rotor according to claim 4, It is characterized in that The rotor laminations are made of silicon steel sheets.

13. The rotor according to claim 4, It is characterized in that The material strength of the end lamination stacks is greater than the material strength of the middle lamination stacks.

14. A permanent magnet synchronous motor, It is characterized in that Comprising the rotor described in any one of claims 1 to 13.

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