Stator core and motor

Abstract

The embodiment of the invention provides a stator core and a motor, the stator core is provided with a yoke part, a tooth handle and a tooth boot, the tooth boot is internally provided with a magnetic field guiding area, and the magnetic field guiding area comprises a first magnetic isolation space and a second magnetic isolation space; the edge of the first magnetic isolation space is closed on the section perpendicular to the rotation axis; the first magnetic conduction bridge is located between the edge of the radial inner side of the first magnetic isolation space and the first edge of the radial inner side of the tooth boot; the second magnetic conduction bridge is located between the edge of the radial outer side of the first magnetic isolation space and the second edge of the radial outer side of the tooth boot; and the third magnetic conduction bridge is located between the edge of one side, far away from the center line, of the first magnetic isolation space in the circumferential direction and the third edge of one side, far away from the center line, of the tooth boot in the circumferential direction. Therefore, the electromagnetic field distribution of the permanent magnet synchronous motor can be optimized and improved from the perspective of electromagnetic design, high-order electromagnetic field harmonic waves are reduced, the radial magnetic pulling force is further reduced, and the vibration noise of the permanent magnet synchronous motor is fundamentally improved.

Description

Technical Field

[0001] The present application relates to the field of electromechanics, and in particular to a stator core and a motor. Background Art

[0002] Permanent magnet synchronous motors can be used in a variety of fields, such as new energy vehicles, fans, machine tools, etc. Permanent magnet synchronous motors have the advantages of large starting torque, variable frequency stepless speed regulation, high power, high power density, and wide speed adjustment range. However, with the application of permanent magnet synchronous motors, their disadvantages also emerge, such as large electromagnetic noise and vibration during high-speed operation, which affects their application in low-noise fields, especially in the fields of home appliances and new energy commercial vehicles.

[0003] In response to the above problems, the solutions adopted by the existing technology mainly include the following: 1. Select appropriate slot-pole combination to reduce harmonics in the electromagnetic field; 2. Use skewed slots or skewed poles in the stator or rotor to improve the electromagnetic field distribution; 3. Add auxiliary slots to the inner edge of the stator to improve the electromagnetic field distribution; 4. Cut teeth on the inner edge of the stator to optimize the electromagnetic field distribution; 5. Design the rotor surface with special features to improve the electromagnetic field distribution.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Summary of the invention

[0005] However, the above solutions for reducing motor noise have their own limitations. For example, for solution 1, due to the application occasions or space limitations of permanent magnet synchronous motors, the stator and rotor slot poles that can be selected for the motor are very limited, especially in the field of household appliances, and it is difficult to design them into distributed windings or short-moment windings, so this solution is difficult to apply in small space applications; for solution 2, the skewed slot or skewed pole structure is mainly used in distributed winding motors, and the production and manufacturing process is complex and the cost is high. It is mostly used in industrial or high-power motors, and is not applicable to low-power motors such as household motors; for solution 3, the main principle of the stator auxiliary slot is to reduce the air gap magnetic field of the permanent magnet synchronous motor. Although some electromagnetic field harmonics can be reduced through design optimization, the main magnetic field will also be weakened accordingly, so the motor efficiency and output power will be significantly reduced; for solution 4, its optimization principle is similar to that of adding auxiliary slots to the stator. While reducing the harmonic magnetic field, it will also reduce the main magnetic field strength of the air gap, thereby reducing the motor efficiency and output capacity; for solution 5, the rotor magnetic field anomaly can effectively reduce the harmonics of the rotor magnetic field, but it has no obvious improvement effect on the stator harmonic magnetic field, especially the first-order tooth harmonics, so the vibration noise improvement effect is limited.

[0006] Therefore, how to effectively reduce the noise of the motor is still a problem that needs to be solved urgently.

[0007] In order to solve at least one of the above problems or other similar problems, the embodiments of the present application provide a stator core and a motor. A magnetic field guide area is provided in the tooth shoe of the stator core, thereby changing the magnetic field distribution, thereby effectively improving the sinusoidality of the motor air gap magnetic field, reducing high-frequency harmonics, and improving the vibration noise of the permanent magnet synchronous motor from the root.

[0008] According to a first aspect of an embodiment of the present application, a stator core is provided, the stator core comprising: a yoke; a tooth shank; and a tooth shoe, wherein a magnetic field guide area is provided in the tooth shoe, and the magnetic field guide area comprises:

[0009] A first magnetic isolation space, wherein the edge of the first magnetic isolation space is closed on a cross section perpendicular to the rotation axis;

[0010] A first magnetic conductive bridge, which is located between the radial inner edge of the first magnetic isolation space and the radial inner first edge of the tooth shoe;

[0011] A second magnetic conductive bridge is located between a radially outer edge of the first magnetic isolation space and a radially outer second edge of the tooth shoe; and

[0012] The third magnetic conductive bridge is located between an edge of the first magnetic isolation space on a side away from the center line of the tooth shank in the circumferential direction and a third edge of the tooth shoe on a side away from the center line in the circumferential direction.

[0013] In at least one embodiment, in a cross section perpendicular to the rotation axis, the magnetic field guide areas on both sides of the circumference of the tooth shank are symmetrically arranged relative to the center line of the tooth shank,

[0014] Wherein, the center line of the shank passes through the circumferential midpoint of the radial inner end of the shank and the rotation axis.

[0015] In at least one embodiment, in a cross section perpendicular to the rotation axis, in a circumferential direction of the shank, the magnetic field guiding area is asymmetrically arranged relative to the center line of the shank.

[0016] In at least one embodiment, on a cross section perpendicular to the rotation axis, an edge shape of the first magnetic isolation space includes: at least one of a curved segment and a straight line segment.

[0017] In at least one embodiment, the magnetic field guiding area further comprises:

[0018] A first magnetic conductive bridge, which is located between the radial inner edge of the first magnetic isolation space and the radial inner first edge of the tooth shoe;

[0019] A second magnetic conductive bridge, which is located between the radially outer edge of the first magnetic isolation space and the radially outer second edge of the tooth shoe;

[0020] The third magnetic conductive bridge is located between an edge of the first magnetic isolation space on a side away from the center line in the circumferential direction and a third edge of the tooth shoe on a side away from the center line in the circumferential direction.

[0021] In at least one embodiment, the width of the first magnetic conductive bridge at its minimum width ranges from 0.2 to 2 mm.

[0022] In at least one embodiment, the circumferential length of the first magnetic bridge is in the range of 0.5 to 3 mm.

[0023] In at least one embodiment, the width of the second magnetic conductive bridge is in the range of 0.2 to 2 mm.

[0024] In at least one embodiment, the width of the third magnetic conductive bridge is greater than or equal to 0.2 mm.

[0025] In at least one embodiment, the magnetic field guiding area also has at least one second magnetic isolation space.

[0026] In at least one embodiment, a fourth magnetic conductive bridge is formed between the circumferentially adjacent second magnetic conductive spaces, or between the circumferentially adjacent second magnetic conductive spaces and the first magnetic conductive spaces, and the width of the fourth magnetic conductive bridge is greater than or equal to 0.2 mm.

[0027] In at least one embodiment, the first magnetic isolation space and / or the second magnetic isolation space is filled with magnetic isolation material.

[0028] According to another aspect of the embodiments of the present application, a motor is provided, comprising the stator core described in any one of the above embodiments.

[0029] One of the beneficial effects of the embodiments of the present application is that a magnetic field guiding area is provided in the tooth shoe of the stator core, thereby changing the magnetic field distribution, thereby effectively improving the sinusoidality of the motor air gap magnetic field, reducing high-frequency harmonics, and improving the vibration noise of the permanent magnet synchronous motor from the root.

[0030] With reference to the following description and accompanying drawings, the specific embodiments of the present application are disclosed in detail, indicating the way in which the principles of the present application can be adopted. It should be understood that the embodiments of the present application are not limited in scope. Within the scope of the spirit and clauses of the appended claims, the embodiments of the present application include many changes, modifications and equivalents.

[0031] Features described and / or illustrated with respect to one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0032] It should be emphasized that the term “include / comprises” when used herein refers to the presence of features, integers, steps or components, but does not exclude the presence or addition of one or more other features, integers, steps or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The elements and features described in one figure or one implementation of the present application embodiment may be combined with the elements and features shown in one or more other figures or implementations. In addition, in the accompanying drawings, similar reference numerals represent corresponding parts in several figures and can be used to indicate corresponding parts used in more than one implementation.

[0034] The included drawings are used to provide a further understanding of the embodiments of the present application, which constitute a part of the specification, are used to illustrate the implementation methods of the present application, and together with the text description, explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0035] Figure 1 It is a schematic top view of the stator core 1.1 of the embodiment of the first aspect of the present application.

[0036] Figure 2 yes Figure 1 An enlarged schematic view of the middle tooth boot 1-3.

[0037] Figure 3 yes Figure 1 An enlarged schematic diagram of the medium magnetic field guiding zone 1-3-1. DETAILED DESCRIPTION

[0038] The foregoing and other features of the present application will become apparent through the following description with reference to the accompanying drawings. In the description and the accompanying drawings, specific embodiments of the present application are specifically disclosed, which show some embodiments in which the principles of the present application can be adopted. It should be understood that the present application is not limited to the described embodiments. On the contrary, the present application includes all modifications, variations and equivalents falling within the scope of the attached claims. Various embodiments of the present application are described below in conjunction with the accompanying drawings. These embodiments are exemplary only and are not limitations of the present application.

[0039] In the embodiments of the present application, the terms "first", "second", "upper", "lower", etc. are used to distinguish different elements in terms of title, but do not indicate the spatial arrangement or time order of these elements, etc., and these elements should not be limited by these terms. The term "and / or" includes any one and all combinations of one or more of the associated listed terms. The terms "comprising", "including", "having", etc. refer to the presence of the stated features, elements, components or components, but do not exclude the presence or addition of one or more other features, elements, components or components.

[0040] In the embodiments of the present application, the singular forms "a", "the", etc. include plural forms and should be broadly understood as "a kind" or "a type" rather than being limited to the meaning of "one"; in addition, the term "said" should be understood to include both singular and plural forms, unless the context clearly indicates otherwise. In addition, the term "according to" should be understood as "at least in part according to...", and the term "based on" should be understood as "at least in part based on...", unless the context clearly indicates otherwise.

[0041] In addition, in the following description of the embodiments of the present application, for the convenience of description, the direction extending along the rotation axis OO' of the motor or the direction parallel to it is referred to as "axial", the radial direction centered on the rotation axis is referred to as "radial", the side away from the central axis along the radial direction is referred to as "radial outer side", the side close to the rotation axis along the radial direction is referred to as "radial inner side", and the direction around the rotation axis is referred to as circumferential. However, it is worth noting that these are only for the convenience of description and do not limit the orientation of the motor and the stator core during use and manufacturing.

[0042] The embodiments of the present application are described below with reference to the accompanying drawings.

[0043] Embodiments of the first aspect

[0044] An embodiment of a first aspect of the present application provides a stator core and a motor having the stator core.

[0045] The motor of the embodiment of the first aspect of the present application includes a stator, a rotor and a casing.

[0046] The rotor can rotate about an axis OO' (eg Figure 1 The stator has a stator core of the embodiment of the first aspect of the present application, and the stator core is radially opposite to the rotor, for example, the rotor is located radially inside the stator core. In addition, the stator may also have an insulating skeleton and slot paper, and an enameled wire winding. The enameled wire winding may be wound on the stator core. The housing accommodates the stator and the rotor.

[0047] Figure 1 is a schematic top view of the stator core of the embodiment of the first aspect of the present application. Figure 1As shown, the stator core 1.1 is used to transmit the electromagnetic field and support the enameled wire winding.

[0048] The stator core 1.1 is formed by stacking stator punching sheets. For example, the stator punching sheets can be iron sheets formed by stamping. A plurality of stator punching sheets are stacked to form the stator core 1.1.

[0049] like Figure 1 As shown, the stator core 1.1 comprises a yoke 1-1, a tooth shank 1-2 and a tooth shoe 1-3.

[0050] The yoke 1-1 is arranged to surround the rotation axis OO'; the shank 1-2 extends radially and the radially outer end is connected to the yoke 1-1, that is, the yoke 1-1 is located radially outside the shank 1-2; the tooth shoe 1-3 extends circumferentially from the radially inner end of the shank 1-2.

[0051] Wherein, a magnetic field guiding area 1-3-1 is provided in the tooth boot 1-3, and the magnetic field guiding area 1-3-1 includes a first magnetic isolation space 1-3-2. The first magnetic isolation space 1-3-2 may be a hollow hole. Alternatively, the first magnetic isolation space 1-3-2 may be filled with magnetic isolation material. For example, the magnetic isolation material may completely fill the first magnetic isolation space 1-3-2, or the magnetic isolation material may fill a portion of the first magnetic isolation space 1-3-2.

[0052] In the motor 100 of the first aspect of the present application, a magnetic field guide area 1-3-1 is provided in the tooth boot 1-3 to change the magnetic field distribution, thereby effectively improving the sinusoidality of the motor air gap magnetic field, reducing high-frequency harmonics, and improving the vibration noise of the permanent magnet synchronous motor from the root.

[0053] like Figure 1 As shown, on a cross section perpendicular to the rotation axis OO', the magnetic field guide areas 1-3-1 on both sides of the shank 1-2 in the circumferential direction are symmetrically arranged relative to the center line of the shank 1-2. For example, the center line MO of the shank 1-2 passes through the circumferential midpoint M of the radially inner end of the shank 1-2 and the rotation axis OO'. In addition, the present application may not be limited to this, and the magnetic field guide areas 1-3-1 may also be distributed asymmetrically relative to the center line MO: for example, in one shank 1-2, the magnetic field guide areas 1-3-1 are not distributed on both sides of the circumferential direction of the center line MO, but only on one side of the circumferential direction of the center line MO; for another example, in one shank 1-2, two magnetic field guide areas 1-3-1 are respectively located on both sides of the circumferential direction of the center line MO, and, in the circumferential direction, the two magnetic field guide areas 1-3-1 are at different distances from the center line MO.

[0054] Figure 2 yes Figure 1 A partially enlarged schematic diagram of the middle tooth boot 1-3. Figure 2As shown, in the cross section perpendicular to the rotation axis OO', the edge of the first magnetic isolation space 1-3-2 is closed.

[0055] In addition, on the cross section perpendicular to the rotation axis OO', the edge shape of the first magnetic isolation space 1-3-2 includes: a curved segment (for example: an arc, a part of an ellipse, or a segment of a parabola, etc.), a straight segment, or a combination of a curved segment and a straight segment.

[0056] Figure 3 yes Figure 1 An enlarged schematic diagram of the magnetic field guide area 1-3-1. Figure 3 As shown, the magnetic field guiding area 1-3-1 also includes: a first magnetic conductive bridge 1-3-1-a, a second magnetic conductive bridge 1-3-1-b and a third magnetic conductive bridge 1-3-1-c.

[0057] Among them, the first magnetic bridge 1-3-1-a is located between the radially inner edge of the first magnetic isolation space 1-3-2 and the radially inner first edge A of the tooth shoe 1-3; the second magnetic bridge 1-3-1-b is located between the radially outer edge of the first magnetic isolation space 1-3-2 and the radially outer second edge B of the tooth shoe 1-3; the third magnetic bridge 1-3-1-c is located between the third edge C on the side of the first magnetic isolation space 1-3-2 that is circumferentially away from the center line MO.

[0058] In at least one embodiment, the width range D1 of the first magnetic bridge 1-3-1-a at its minimum width is 0.2 to 2 mm, and the circumferential length range D2 of the first magnetic bridge 1-3-1-a is 0.5 to 3 mm. The width range D3 of the second magnetic bridge 1-3-1-b is 0.2 to 2 mm. The width D4 of the third magnetic bridge 1-3-1-c is greater than or equal to 0.2 mm.

[0059] In addition, if Figure 3 As shown, the magnetic field guiding area 1-3-1 also has at least one second magnetic isolation space 1-3-3, and the second magnetic isolation space 1-3-3 is located in the tooth shoe 1-3 or the tooth handle 1-2. For example, the second magnetic isolation space 1-3-3 can be located in the tooth shoe 1-3, or the second magnetic isolation space 1-3-3 can be located in the tooth handle 1-2, or a part of the second magnetic isolation space 1-3-3 can be located in the tooth handle 1-2, and the other part can be located in the tooth shoe 1-2. In addition, the second magnetic isolation space 1-3-3 can also be filled with magnetic isolation material.

[0060] In the present application, the number of the second magnetic isolation spaces 1-3-3 can be one or more than two, wherein when the number of the second magnetic isolation spaces 1-3-3 is more than two, the shapes of the second magnetic isolation spaces 1-3-3 can be the same or different. That is, in the present application, the magnetic isolation spaces other than the first magnetic isolation space 1-3-2 in the magnetic field guiding area 1-3-1 are all referred to as second magnetic isolation spaces 1-3-3, regardless of whether the shapes of the second magnetic isolation spaces 1-3-3 are the same.

[0061] A fourth magnetic bridge 1-3-1-d is formed between circumferentially adjacent second magnetic isolation spaces 1-3-3, or between circumferentially adjacent second magnetic isolation spaces 1-3-3 and second magnetic isolation spaces 1-3-2, and the width of the fourth magnetic bridge 1-3-1-d (for example, the smallest dimension) is greater than or equal to 0.2 mm.

[0062] It is worth noting that the above only exemplifies the composition and structure of the motor related to the present application, but the present application is not limited thereto, and appropriate modifications can be made based on the above embodiments. In addition, the above only exemplifies the various components, but the present application is not limited thereto, and the specific contents of each component can also refer to the relevant technology; the motor can also include other components, such as bearings, etc., which can be specifically referred to the relevant technology, and the description is omitted here.

[0063] Embodiments of the second aspect

[0064] An embodiment of the present application provides an electrical product having the motor described in the embodiment of the first aspect.

[0065] Since the structure of the motor has been described in detail in the embodiment of the first aspect, its content is incorporated here and the description is omitted here.

[0066] In the implementation of this application, the electrical product may be any electrical equipment provided with a motor, for example, a new energy commercial vehicle, a household appliance, etc.

[0067] The present application is described above in conjunction with specific implementation methods, but it should be clear to those skilled in the art that these descriptions are exemplary and are not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on the spirit and principles of the present application, and these modifications and variations are also within the scope of the present application.

[0068] The preferred embodiments of the present application are described above with reference to the accompanying drawings. Many features and advantages of these embodiments are clear from this detailed description, and therefore the appended claims are intended to cover all such features and advantages of these embodiments that fall within their true spirit and scope. In addition, since many modifications and changes are easily conceivable to those skilled in the art, the embodiments of the present application are not intended to be limited to the precise structures and operations illustrated and described, but all suitable modifications and equivalents that fall within their scope may be covered.

Claims

1. A stator core, comprising a yoke, a tooth shank and a tooth shoe, wherein: The tooth shoe is provided with a magnetic field guide area, The magnetic field guiding area comprises: A first magnetic isolation space, wherein the edge of the first magnetic isolation space is closed on a cross section perpendicular to the rotation axis; A first magnetic conductive bridge, which is located between the radial inner edge of the first magnetic isolation space and the radial inner first edge of the tooth shoe; A second magnetic conductive bridge is located between a radially outer edge of the first magnetic isolation space and a radially outer second edge of the tooth shoe; and The third magnetic conductive bridge is located between an edge of the first magnetic isolation space on a side away from the center line of the tooth shank in the circumferential direction and a third edge of the tooth shoe on a side away from the center line in the circumferential direction.

2. The stator core according to claim 1, characterized in that: In a cross section perpendicular to the rotation axis, the magnetic field guide areas on both sides of the circumferential direction of the tooth shank are symmetrically arranged relative to the center line of the tooth shank, Wherein, the center line of the shank passes through the circumferential midpoint of the radial inner end of the shank and the rotation axis.

3. The stator core according to claim 1, characterized in that: In a cross section perpendicular to the rotation axis, in a circumferential direction of the tooth shank, the magnetic field guide region is disposed asymmetrically with respect to the center line of the tooth shank.

4. The stator core according to any one of claims 1 to 3, characterized in that: On a cross section perpendicular to the rotation axis, an edge shape of the first magnetic isolation space includes at least one of a curved segment and a straight segment.

5. The stator core according to any one of claims 1 to 3, characterized in that: The width of the first magnetic conductive bridge at its smallest point ranges from 0.2 to 2 mm.

6. The stator core according to any one of claims 1 to 3, characterized in that: The circumferential length of the first magnetic conductive bridge is in the range of 0.5 to 3 mm.

7. The stator core according to any one of claims 1 to 3, characterized in that: The width of the second magnetic conductive bridge is in the range of 0.2 to 2 mm.

8. The stator core according to any one of claims 1 to 3, characterized in that: The width of the third magnetic conductive bridge is greater than or equal to 0.2 mm.

9. The stator core according to any one of claims 1 to 3, characterized in that: The magnetic field guiding area also has at least one second magnetic isolation space.

10. The stator core according to claim 9, characterized in that: A fourth magnetic conductive bridge is formed between the second magnetic conductive spaces adjacent to each other in the circumferential direction, or between the second magnetic conductive space and the first magnetic conductive space adjacent to each other in the circumferential direction, and a width of the fourth magnetic conductive bridge is greater than or equal to 0.2 mm.

11. The stator core according to claim 10, characterized in that: The first magnetic isolation space and / or the second magnetic isolation space is filled with magnetic isolation material.

12. A motor, characterized in that: The electric motor comprises a stator core according to any one of claims 1 to 11.

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