High-speed motor rotor structure

Abstract

The utility model discloses a high-speed motor rotor structure, which comprises at least two rotor punching sheets formed by lamination, a plurality of magnetic steel groove groups are arranged around a central through hole in each rotor punching sheet, and each magnetic steel groove group comprises two magnetic steel grooves which are axially symmetrically arranged. The grouping design of the magnetic steel grooves enables magnetic flux to be more concentrated in the groups, and magnetic leakage caused by the fact that the magnetic flux directly crosses the adjacent groups is reduced.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a high-speed motor rotor structure. Background Art

[0002] In modern machining, drilling and tapping machines occupy a vital position across multiple industries due to their high precision and efficiency. Asynchronous high-speed spindle motors, their core drive components, are particularly well-suited for high-speed precision machining due to their high efficiency, wide speed range, and compact design. The motor rotor is typically constructed from a series of identical rotor laminations, precisely laminated together. This design simplifies rotor assembly, reduces manufacturing costs, and ensures high-precision rotor dynamic balancing.

[0003] In the current mainstream rotor lamination design, permanent magnets are evenly distributed across the rotor lamination's cross-section. While structurally simple, this design has limitations in pole distribution and core gap control, which can easily lead to magnetic flux leakage, a phenomenon known as "magnetic leakage." This magnetic leakage not only weakens the effective magnetic field within the motor, reducing electromagnetic torque and speed, but also increases magnetic field losses, causing the motor's operating temperature to rise, impacting overall performance and lifespan. Utility Model Content

[0004] The purpose of this application is to provide a high-speed motor rotor structure that can improve the above-mentioned problems.

[0005] The embodiment of the present application is implemented as follows:

[0006] The present application provides a high-speed motor rotor structure, comprising at least two rotor punchings formed by lamination; the shape and size of any cross section of each rotor punching along its thickness direction are equal;

[0007] Each of the rotor punchings is provided with a central through hole and at least four magnetic steel slot groups arranged around the central through hole, each magnetic steel slot group includes two axially symmetrically arranged magnetic steel slots, and each magnetic steel slot is filled with a permanent magnet; in the cross section of the rotor punching, the magnetic steel slot groups are arranged centrally symmetrically about the center point of the central through hole, and the first spacing between two magnetic steel slots in the same magnetic steel slot group is smaller than the second spacing between two adjacent magnetic steel slot groups.

[0008] As can be understood, the present application discloses a high-speed motor rotor structure comprising at least two stacked rotor laminations. Each rotor lamination has multiple magnetic slot groups arranged around a central through-hole, with each magnetic slot group comprising two axially symmetrically arranged magnetic slots. This grouping of magnetic slots concentrates the magnetic flux within a group, reducing magnetic flux leakage caused by magnetic flux directly crossing adjacent groups. Furthermore, the grouping of magnetic slots helps distribute the magnetic flux more evenly within the rotor, improving the motor's efficiency and reducing local overheating caused by concentrated magnetic flux.

[0009] In an optional embodiment of the present application, on the cross section of the rotor punching, each magnetic steel slot is in a bar shape, the line between the center point and the bar midpoint of each magnetic steel slot is the magnetic steel slot axis, and the first angle between the axes of two magnetic steel slots in the same magnetic steel slot group is smaller than the second angle between the two closest magnetic steel slot axes in different magnetic steel slot groups.

[0010] As can be understood, the above-mentioned angle design strengthens the interaction between the permanent magnets within the group, helping to form a more closed magnetic circuit. This more closed magnetic circuit can more effectively confine the magnetic flux and reduce the space outside the rotor where the magnetic flux leaks.

[0011] In an optional embodiment of the present application, on the cross section of the rotor punching, a third angle is formed between two magnetic steel slots in the same magnetic steel slot group, the third angle is toward the central through hole, and the third angle is less than 180°.

[0012] It can be understood that on the cross-section of the rotor punching, an obtuse angle is formed between the two magnetic steel slots. This angle design enables a specific magnetic flux path to be formed between the two magnetic steel slots in the magnetic steel slot group. The angle design toward the central hole helps to direct the magnetic flux more concentratedly to the central area of ​​the rotor, reducing the leakage of magnetic flux at the edge of the rotor punching, thereby improving the utilization of the magnetic flux and the performance of the motor.

[0013] In an optional embodiment of the present application, at least four strip grooves are provided on the outer side wall of the rotor punching, the strip grooves extend along the thickness direction of the rotor punching, and the strip grooves are located between two adjacent magnetic steel slot groups.

[0014] As can be understood, the strip-shaped grooves on the outer sidewalls of the rotor laminations increase the surface area of ​​the outer wall, thereby providing more heat dissipation area. This helps to more effectively dissipate heat generated during motor operation, preventing overheating and ensuring stable operation. Furthermore, the recessed strips create specific air flow channels. As the rotor rotates through the air, these flow channels reduce the viscous resistance of the air, thereby reducing rotor vibration and noise.

[0015] Optionally, on the cross section of the rotor punching, the groove bottom curve of the strip groove is an arc. It is understood that the arc-shaped strip groove bottom may change the air flow pattern around the rotor punching, allowing air to flow more smoothly and remove heat.

[0016] In an optional embodiment of the present application, the rotor punchings are further provided with flow slots, the number of which is equal to the number of the permanent magnets. Optionally, in the cross-section of the rotor punchings, each flow slot is located between the two ends of a single magnetic steel slot. It is understood that the flow slots can be used to cool the magnetic steel, reduce exhaust resistance, and reduce axial movement; the number of flow slots matches the number of permanent magnets.

[0017] In an optional embodiment of the present application, in a cross-section of the rotor sheet, both ends of the magnetic steel slot are provided with a first raised portion oriented toward the center point. Alternatively, in a cross-section of the rotor sheet, both ends of the permanent magnet embedded in the magnetic steel slot also have a second raised portion oriented toward the center point. Alternatively, in a cross-section of the rotor sheet, the raised height of the second raised portion is less than or equal to the raised height of the first raised portion.

[0018] It can be understood that when the permanent magnet is embedded in the magnetic steel slot, the second protrusion is embedded in the first protrusion. The design of the protrusion structure can increase the fixing effect of the magnetic steel slot on the permanent magnet, preventing the permanent magnet from being displaced due to factors such as vibration or centrifugal force during the operation of the motor. This helps to maintain the stable position of the permanent magnet in the magnetic steel slot, thereby ensuring the stable operation of the motor. In addition, the protrusion structure may have a certain guiding effect on the magnetic flux path through the design of its shape and position, helping the magnetic flux to pass through the magnetic steel slot more smoothly, reducing magnetic resistance and leakage, and improving the efficiency of the motor.

[0019] Beneficial effects:

[0020] This application discloses a high-speed motor rotor structure comprising at least two laminated rotor laminations. Each rotor lamination has multiple magnetic slot groups arranged around a central through-hole. Each magnetic slot group includes two magnetic slots arranged axially symmetrically. This grouping of magnetic slots concentrates magnetic flux within a group, reducing magnetic flux leakage caused by magnetic flux directly crossing adjacent groups.

[0021] In addition, on the cross-section of the rotor punching, an obtuse angle is formed between the two magnetic steel slots. This angle design enables a specific magnetic flux path to be formed between the two magnetic steel slots in the magnetic steel slot group. The angle design toward the central hole helps to direct the magnetic flux more concentratedly to the central area of ​​the rotor, reducing the leakage of magnetic flux at the edge of the rotor punching, thereby improving the utilization of magnetic flux and the performance of the motor.

[0022] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a schematic diagram of the cross-sectional structure of a rotor punching provided by the present application;

[0025] Figure 2 This is a schematic diagram of the cross-sectional structure of another rotor punching provided by the present application;

[0026] Figure 3 This is a schematic diagram of the cross-sectional structure of another rotor punching provided by the present application;

[0027] Figure 4 yes Figure 3 An enlarged schematic diagram of the middle magnetic steel slot. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] The present application provides a high-speed motor rotor structure, comprising at least two rotor punchings formed by stacking; the shape and size of any cross section of each rotor punching along its thickness direction are equal.

[0030] like Figures 1 to 3 In the cross section of the rotor punching shown, each rotor punching 10 is provided with a central through hole 20 and a first magnetic steel slot group 11, a second magnetic steel slot group 12, a third magnetic steel slot group 13, and a fourth magnetic steel slot group 14 arranged around the central through hole 20. The magnetic steel slot groups are arranged in a central symmetric manner about the center point Q of the central through hole 20. Each magnetic steel slot group includes two magnetic steel slots arranged axially symmetrically, and each magnetic steel slot is filled with a permanent magnet. The first spacing between two magnetic steel slots in the same magnetic steel slot group is smaller than the second spacing between two adjacent magnetic steel slot groups. Figure 1As shown, the first magnetic steel slot group 11 includes a first magnetic steel slot 21 and a second magnetic steel slot 22 that are symmetrically arranged, and the second magnetic steel slot group 12 includes a third magnetic steel slot 23 and a fourth magnetic steel slot 24 that are symmetrically arranged; the spacing between the first magnetic steel slot 21 and the second magnetic steel slot 22 in the first magnetic steel slot group 11 is the above-mentioned first spacing, and the spacing between the second magnetic steel slot 22 and the third magnetic steel slot 23 is the above-mentioned second spacing. It can be seen from the figure that the first spacing d1 is smaller than the second spacing d2.

[0031] As can be understood, the present application discloses a high-speed motor rotor structure comprising at least two stacked rotor laminations. Each rotor lamination has multiple magnetic slot groups arranged around a central through-hole, with each magnetic slot group comprising two axially symmetrically arranged magnetic slots. This grouping of magnetic slots concentrates the magnetic flux within a group, reducing magnetic flux leakage caused by magnetic flux directly crossing adjacent groups. Furthermore, the grouping of magnetic slots helps distribute the magnetic flux more evenly within the rotor, improving the motor's efficiency and reducing local overheating caused by concentrated magnetic flux.

[0032] In an optional embodiment of the present application, in the cross-section of the rotor lamination 10, each magnetic steel slot is strip-shaped. The line connecting the center point and the strip midpoint of each magnetic steel slot is the magnetic steel slot axis. The first angle between the axes of two magnetic steel slots in the same magnetic steel slot group is smaller than the second angle between the two closest magnetic steel slot axes in different magnetic steel slot groups. The strip midpoint is the midpoint of the edge segment of the strip-shaped magnetic steel slot.

[0033] like Figure 1 As shown, the angle a between the first magnetic steel slot axis 31 and the second magnetic steel slot axis 32 in the first magnetic steel slot group 11 is the above-mentioned first angle; the angle b between the second magnetic steel slot axis 32 and the third magnetic steel slot axis 33 is the above-mentioned second angle; it can be seen from the figure that the first angle is smaller than the second angle.

[0034] As can be understood, the above-mentioned angle design strengthens the interaction between the permanent magnets within the group, helping to form a more closed magnetic circuit. This more closed magnetic circuit can more effectively confine the magnetic flux and reduce the space outside the rotor where the magnetic flux leaks.

[0035] In an optional embodiment of the present application, Figure 1 As shown, on the cross section of the rotor punching 10 , a third angle c is formed between two magnetic steel slots in the same magnetic steel slot group. The third angle c faces the central through hole 20 and is less than 180°.

[0036] It can be understood that on the cross-section of the rotor punching, an obtuse angle is formed between the two magnetic steel slots. This angle design enables a specific magnetic flux path to be formed between the two magnetic steel slots in the magnetic steel slot group. The angle design toward the central hole helps to direct the magnetic flux more concentratedly to the central area of ​​the rotor, reducing the leakage of magnetic flux at the edge of the rotor punching, thereby improving the utilization of the magnetic flux and the performance of the motor.

[0037] In an optional embodiment of the present application, Figure 2 As shown, four strip grooves 40 are provided on the outer wall of the rotor punching 10 . The strip grooves 40 extend along the thickness direction of the rotor punching 10 , and the strip grooves 40 are located between two adjacent magnetic steel slot groups.

[0038] As will be appreciated, the provision of strip-shaped grooves on the outer sidewalls of the rotor sheets increases the surface area of ​​the outer wall of the rotor sheets 10, thereby providing more heat dissipation area. This helps to more effectively dissipate heat generated during motor operation, preventing overheating and ensuring stable motor operation. Furthermore, the recessed strips form specific air flow channels that reduce the viscous resistance of the air as the rotor rotates, thereby reducing rotor vibration and noise.

[0039] Optionally, on the cross section of the rotor sheet, the groove bottom curve of the strip groove is an arc. It is understandable that the arc-shaped strip groove bottom may change the air flow pattern around the rotor sheet, allowing air to flow more smoothly and take away heat.

[0040] In an optional embodiment of the present application, Figure 3 As shown, the rotor sheet 10 is also provided with flow slots 50, the number of which is equal to the number of permanent magnets. Optionally, each flow slot 50 is located between the two ends of a single magnetic steel slot in the cross section of the rotor sheet 10. It will be appreciated that the flow slots 50 can be used to cool the magnetic steel, reduce exhaust resistance, and reduce axial movement; the number of flow slots 50 matches the number of permanent magnets.

[0041] In an optional embodiment of the present application, in a cross-section of the rotor sheet, both ends of the magnetic steel slot are provided with a first raised portion oriented toward the center. Alternatively, in a cross-section of the rotor sheet, both ends of the permanent magnets embedded in the magnetic steel slot also have a second raised portion oriented toward the center. Alternatively, in a cross-section of the rotor sheet, the raised height of the second raised portion is less than or equal to the raised height of the first raised portion.

[0042] Taking the second magnetic steel slot 21 as an example, Figure 4 As shown, both ends of the second magnetic steel slot 21 are provided with first protrusions 211 facing the center point Q; both ends of the permanent magnet 60 embedded in the second magnetic steel slot 21 also have second protrusions 61 facing the center point Q. Figure 4As shown, the protrusion height h2 of the second protrusion portion 61 is less than or equal to the protrusion height h1 of the first protrusion portion 211 .

[0043] It can be understood that when the permanent magnet is embedded in the magnetic steel slot, the second protrusion is embedded in the first protrusion. The design of the protrusion structure can increase the fixing effect of the magnetic steel slot on the permanent magnet, preventing the permanent magnet from being displaced due to factors such as vibration or centrifugal force during the operation of the motor. This helps to maintain the stable position of the permanent magnet in the magnetic steel slot, thereby ensuring the stable operation of the motor. In addition, the protrusion structure may have a certain guiding effect on the magnetic flux path through the design of its shape and position, helping the magnetic flux to pass through the magnetic steel slot more smoothly, reducing magnetic resistance and leakage, and improving the efficiency of the motor.

[0044] The terms "first," "second," "the first," or "the second" used in various embodiments of the present disclosure may modify various components regardless of order and / or importance, but these terms do not limit the corresponding components. The above terms are configured solely for the purpose of distinguishing an element from other elements. For example, a first user device and a second user device represent different user devices, even though both are user devices. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element without departing from the scope of the present disclosure.

[0045] When one element (for example, a first element) is referred to as being “(operably or communicably) coupled” or “(operably or communicably) coupled to” or “connected to” another element (for example, a second element), it should be understood that the one element is directly connected to the other element or that the one element is indirectly connected to the other element via yet another element (for example, a third element). Conversely, it should be understood that when an element (for example, a first element) is referred to as being “directly connected” or “directly coupled” to another element (the second element), there is no element (for example, a third element) interposed therebetween.

[0046] It should be noted that, in this document, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context of the specific embodiment.

[0047] The above description is merely an optional embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but should also encompass other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

[0048] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A high-speed motor rotor structure, characterized in that: comprising at least two rotor laminations formed by lamination; The shape and size of any cross section of each rotor punching along its thickness direction are equal; Each of the rotor punchings is provided with a central through hole and at least four magnetic steel slot groups arranged around the central through hole, each magnetic steel slot group includes two axially symmetrically arranged magnetic steel slots, and each magnetic steel slot is filled with a permanent magnet; in the cross section of the rotor punching, the magnetic steel slot groups are arranged centrally symmetrically about the center point of the central through hole, and the first spacing between two magnetic steel slots in the same magnetic steel slot group is smaller than the second spacing between two adjacent magnetic steel slot groups.

2. The high-speed motor rotor structure according to claim 1, characterized in that: On the cross section of the rotor punching, each magnetic steel slot is in a bar shape, the line connecting the center point and the bar midpoint of each magnetic steel slot is the magnetic steel slot axis, and the first angle between the axes of two magnetic steel slots in the same magnetic steel slot group is smaller than the second angle between the two closest magnetic steel slot axes in different magnetic steel slot groups.

3. The high-speed motor rotor structure according to claim 2, characterized in that: On the cross section of the rotor punching sheet, a third angle is formed between two magnetic steel slots in the same magnetic steel slot group, the third angle is oriented toward the central through hole, and the third angle is less than 180°.

4. The high-speed motor rotor structure according to any one of claims 1 to 3, characterized in that: At least four strip-shaped grooves are provided on the outer side wall of the rotor punching sheet. The strip-shaped grooves extend along the thickness direction of the rotor punching sheet, and the strip-shaped grooves are located between two adjacent magnetic steel slot groups.

5. The high-speed motor rotor structure according to claim 4, characterized in that: On the cross section of the rotor punching sheet, the groove bottom curve of the strip-shaped groove is an arc.

6. The high-speed motor rotor structure according to any one of claims 1 to 3, characterized in that: The rotor punching sheet is further provided with flow slots, and the number of the flow slots is equal to the number of the permanent magnets.

7. The high-speed motor rotor structure according to claim 6, characterized in that: In the cross section of the rotor punching sheet, each of the flow slots is located between two ends of a single magnetic steel slot.

8. The high-speed motor rotor structure according to any one of claims 1 to 3, characterized in that: On the cross section of the rotor punching sheet, both ends of the magnetic steel slot are provided with first protruding portions facing the center point.

9. The high-speed motor rotor structure according to claim 8, characterized in that: In the cross section of the rotor sheet, both ends of the permanent magnet embedded in the magnetic steel slot also have a second protrusion facing the center point.

10. The high-speed motor rotor structure according to claim 9, characterized in that: In a cross section of the rotor punching sheet, a protruding height of the second protruding portion is less than or equal to a protruding height of the first protruding portion.

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