Rotor lamination and electric machine rotor
By setting magnetic separators in the rotor laminations and aligning the ventilation holes radially with the conductor slots, the power factor and strength issues during motor cooling are resolved, achieving efficient cooling and improved strength while reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YIMENGDA (TIANJIN) DRIVE TECHNOLOGY CO LTD
- Filing Date
- 2025-07-23
- Publication Date
- 2026-07-14
AI Technical Summary
The existing motors suffer from reduced power factor and rotor strength when axial channels are used for cooling.
A magnetically conductive partition is provided in the rotor laminations. The partition shortens the magnetic circuit length, increases the contact area between the ventilation holes and the air, and aligns the ventilation holes radially with the conductor slots to improve cooling efficiency and mechanical strength.
It improves the power factor of the motor, maintains or slightly reduces cooling efficiency, and enhances the mechanical strength of the rotor laminations, thereby reducing production costs.
Smart Images
Figure CN224503011U_ABST
Abstract
Description
Technical Field
[0001] This disclosure pertains to the field of electrical machines, and more specifically, relates to a rotor lamination and an electric motor rotor. Background Technology
[0002] It is known that electric motors can generate a significant amount of heat during operation. This heat affects the motor's power and lifespan, thus requiring heat removal. In some existing technologies, heat removal can be aided by incorporating axial channels within the motor rotor for cooling air to pass through, thereby improving the motor's cooling efficiency. However, incorporating axial channels can lead to a decrease in the motor's power factor and rotor strength. Therefore, improvements to the axial channels are desired to eliminate or reduce their adverse effects on motor performance. Utility Model Content
[0003] This disclosure provides a rotor lamination comprising: a plurality of conductor slots extending axially through the rotor lamination and arranged circumferentially, each conductor slot for receiving a rotor conductor therein; a plurality of ventilation holes extending axially through the rotor lamination and arranged circumferentially, each ventilation hole for airflow through, the plurality of ventilation holes being disposed radially inside the plurality of conductor slots, each ventilation hole being radially aligned with at least two of the plurality of conductor slots; and a plurality of magnetically conductive partitions, each partition extending circumferentially across a corresponding ventilation hole to form a plurality of ventilation portions separated by the partitions in the ventilation hole.
[0004] In this disclosure, on the one hand, by providing a partition, magnetic flux can pass through the partition, thereby shortening the length of the magnetic circuit and reducing losses, thus improving the power factor. Furthermore, although providing a partition reduces the area of the ventilation holes, the partition increases the contact area between the channel and the air, ensuring that the cooling efficiency of the motor is not significantly degraded by the partition, or only slightly degraded. Moreover, the partition increases the strength of the rotor laminations, allowing them to operate at higher speeds. On the other hand, by radially aligning each ventilation hole with at least two conductor slots, it is beneficial to increase the area of the ventilation holes while ensuring sufficient mechanical strength. Furthermore, by radially aligning each ventilation hole with at least two conductor slots, the rotor laminations are easier to manufacture, thereby reducing the production cost of the rotor laminations.
[0005] Furthermore, the radial width of the partition is constant.
[0006] In this disclosure, by keeping the radial width of the partition constant, the magnetic field can be uniformly distributed at the partition, thereby reducing magnetic leakage and lowering losses.
[0007] Furthermore, the ratio of the radial width of the partition to the minimum radial width of the corresponding ventilation hole is less than or equal to 1 / 10.
[0008] In this disclosure, by making the ratio of the radial width of the partition to the minimum radial width of the ventilation hole less than or equal to 1 / 10, the partition will not excessively occupy the area of the ventilation hole, thereby ensuring that the motor has sufficient cooling efficiency.
[0009] Furthermore, the rotor laminations also include a magnetically conductive radial portion that separates two adjacent ventilation holes, and the circumferential width of the radial portion is constant.
[0010] In this disclosure, by keeping the circumferential width of the radial portion constant, the magnetic field can be uniformly distributed in the radial portion, thereby reducing magnetic leakage and lowering losses.
[0011] Furthermore, the ratio of the circumferential width of the radial portion to the maximum circumferential width of any one of the two corresponding ventilation holes is greater than or equal to 1 / 4.
[0012] In this disclosure, by making the ratio of the circumferential width of the radial portion to the maximum circumferential width of the ventilation hole greater than or equal to 1 / 4, the ventilation hole will not excessively occupy the space of the radial portion, thereby ensuring that the motor has a sufficient power factor.
[0013] Furthermore, the ratio of the maximum radial width of the partition to the circumferential width of the radial portion is less than or equal to 1 / 4.
[0014] In this disclosure, by making the ratio of the maximum radial width of the partition to the circumferential width of the radial part less than or equal to 1 / 4, the partition will not excessively occupy the area of the ventilation hole, thereby ensuring that the motor has sufficient cooling efficiency.
[0015] Furthermore, the rotor laminations also include a magnetically conductive outer circumferential portion that separates the conductor slot from the ventilation hole, and the radial width of the outer circumferential portion is constant.
[0016] In this disclosure, by keeping the radial width of the outer circumference constant, the magnetic field can be uniformly distributed in the outer circumference, thereby reducing magnetic leakage and lowering losses.
[0017] Furthermore, the ratio of the radial width of the outer peripheral portion to the maximum radial width of the corresponding ventilation hole is greater than or equal to 1 / 3.
[0018] In this disclosure, by making the ratio of the radial width of the outer peripheral portion to the maximum radial width of the ventilation hole greater than or equal to 1 / 3, the ventilation hole will not excessively occupy the space of the outer peripheral portion, thereby ensuring that the motor has a sufficient power factor.
[0019] Furthermore, the rotor laminations also include a central hole that passes through the rotor laminations in the axial direction and is disposed radially inside the plurality of ventilation holes. The central hole is used to receive the rotor shaft. The rotor laminations also include a magnetically conductive inner circumferential portion that separates the ventilation holes from the central hole. The radial width of the inner circumferential portion is constant.
[0020] In this disclosure, by keeping the radial width of the inner circumferential portion constant, the magnetic field can be uniformly distributed in the inner circumferential portion, thereby reducing magnetic leakage and lowering losses.
[0021] Furthermore, the ratio of the radial width of the inner circumferential portion to the maximum radial width of the corresponding ventilation hole is greater than or equal to 1 / 3.
[0022] In this disclosure, by making the ratio of the radial width of the inner circumferential portion to the maximum radial width of the ventilation hole greater than or equal to 1 / 3, the ventilation hole will not excessively occupy the space of the inner circumferential portion, thereby ensuring that the motor has a sufficient power factor.
[0023] This disclosure also provides an electric motor rotor comprising: the rotor laminations described above; a rotor shaft on which a plurality of the rotor laminations are stacked together and mounted; and a rotor conductor received in a conductor slot of the rotor laminations.
[0024] This disclosure also provides an electric motor that includes the motor rotor described above. Attached Figure Description
[0025] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this disclosure, illustrate exemplary embodiments of the present disclosure and are used to explain the disclosure, but do not constitute an undue limitation of the disclosure. In the drawings:
[0026] Figure 1 This is a schematic diagram of a rotor lamination according to an embodiment of the present disclosure;
[0027] Figure 2 yes Figure 1 An enlarged view of region A in the image.
[0028] List of reference numerals in the attached diagram:
[0029] 1. Conductor groove;
[0030] 2. Ventilation holes;
[0031] 21. Ventilation components;
[0032] 21a. First ventilation section;
[0033] 21b. Second ventilation section;
[0034] 3. Divider section;
[0035] 4. Radial part;
[0036] 5. Outer periphery;
[0037] 6. Center hole;
[0038] 7. Inner peripheral region;
[0039] W21, radial width of ventilation hole 2;
[0040] W22, the maximum circumferential width of ventilation hole 2;
[0041] W23, minimum radial width of the first ventilation section 21a;
[0042] W24, minimum radial width of the second ventilation section 21b;
[0043] W3, radial width of partition 3;
[0044] W4, the circumferential width of the radial part 4;
[0045] W5, radial width of the outer peripheral portion 5;
[0046] W7, radial width of the inner circumferential portion 7;
[0047] C. Circumferential direction. Detailed Implementation
[0048] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.
[0049] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise.
[0050] The following is for reference. Figure 1 and Figure 2 Describes a rotor lamination according to an embodiment of the present disclosure.
[0051] Figure 1 This is a schematic diagram of a rotor lamination according to an embodiment of the present disclosure. Figure 2 yes Figure 1An enlarged view of region A in the image.
[0052] refer to Figure 1 This disclosure provides a rotor lamination comprising: a plurality of conductor slots 1 extending axially through the rotor lamination and arranged in a circumferential direction C, each conductor slot 1 for receiving a rotor conductor (not shown); a plurality of ventilation holes 2 extending axially through the rotor lamination and arranged in a circumferential direction C, each ventilation hole 2 for airflow through, the plurality of ventilation holes 2 being disposed radially inside the plurality of conductor slots 1, each ventilation hole 2 being radially aligned with at least two of the plurality of conductor slots 1; and a plurality of magnetically conductive partitions 3, each partition 3 extending transversely across a corresponding ventilation hole 2 in a circumferential direction C to form a plurality of ventilation portions 21 separated by the partitions 3 in the ventilation hole 2.
[0053] In this document, unless the context clearly indicates otherwise, axial, radial, and circumferential directions are all relative to the rotor laminations. Radial alignment of one lamination with another means that at least a portion of one lamination is located in approximately the same position as at least a portion of the other lamination in the circumferential direction C.
[0054] As an example, the number of ventilation holes 2 can be equal to the number of partitions 3, with each ventilation hole 2 corresponding to one partition 3. For instance, each ventilation hole 2 may include two ventilation sections 21 separated by partitions 3, arranged side-by-side in the radial direction. In other instances, the number of ventilation holes 2 may be less than the number of partitions 3. For example, each ventilation hole 2 may correspond to two partitions 3, such that the ventilation hole 2 is divided into three ventilation sections 21.
[0055] As an example, for each ventilation opening 2, the plurality of ventilation portions 21 may include adjacent first ventilation portion 21a and second ventilation portion 21b, wherein the first ventilation portion 21a may be disposed radially inside the second ventilation portion 21b. The ratio of the minimum radial width W23 of the first ventilation portion 21a to the minimum radial width W24 of the second ventilation portion 21b may be between 5 / 6 and 1, for example, between 9 / 10 and 1.
[0056] As an example, the radial width of the ventilation section 21 can be constant. For instance, the ventilation section 21 can have a fan-shaped ring.
[0057] As an example, each vent 2 can be radially aligned with at least three of the conductor grooves 1. For instance, some of the vent 2 can be radially aligned with three conductor grooves 1, while another portion of the vent 2 can be radially aligned with four conductor grooves 1.
[0058] As an example, the profile of conductor slot 1 can be closed to allow the rotor conductor to be cast directly into conductor slot 1. For example, the rotor conductor can contain aluminum.
[0059] In this disclosure, on the one hand, by providing the partition 3, magnetic flux can pass through the partition 3, thereby shortening the length of the magnetic circuit and reducing losses, thus improving the power factor. Furthermore, although providing the partition 3 reduces the area of the ventilation holes 2 (the total area of the plurality of ventilation sections 21), the partition 3 increases the contact area between the channel (composed of the ventilation holes 2) and the air, ensuring that the cooling efficiency of the motor is not significantly degraded by the partition 3, or only slightly degraded. Moreover, the partition 3 increases the strength of the rotor laminations, allowing the rotor laminations to be suitable for higher speeds. On the other hand, by radially aligning each ventilation hole 2 with at least two conductor slots 1, it is beneficial to increase the area of the ventilation hole 2 while ensuring sufficient mechanical strength. Furthermore, by radially aligning each ventilation hole 2 with at least two conductor slots 1, the rotor laminations are easier to manufacture, thereby reducing the production cost of the rotor laminations.
[0060] refer to Figure 2 The radial width W3 of the partition 3 is constant.
[0061] In this article, constant dimension means that the dimension does not change with the change of measurement location.
[0062] As an example, the partition 3 can have an elongated strip shape or a strip shape.
[0063] In this disclosure, by keeping the radial width W3 of the partition 3 constant, the magnetic field can be uniformly distributed in the partition 3, thereby reducing magnetic leakage and lowering losses.
[0064] refer to Figure 2 The ratio of the radial width W3 of the partition 3 to the minimum radial width W21 of the corresponding ventilation hole 2 is less than or equal to 1 / 10.
[0065] In this document, when describing the radial width of the vent 2, it is not necessary to subtract the radial width of the partition 3. In other words, for example, in... Figure 1 and Figure 2 In the example shown, the radial width W21 of the ventilation hole 2 includes the radial width W3 of the partition 3.
[0066] As an example, the radial width of the ventilation hole 2 can be constant. For instance, the ventilation hole 2 can have a fan-shaped ring. In this case, the minimum radial width and the maximum radial width of the ventilation hole 2 are equal and can be collectively referred to as the radial width of the ventilation hole 2. Therefore, in this embodiment, the radial width, minimum radial width, and maximum radial width of the ventilation hole 2 can all be indicated by the same reference numeral W21.
[0067] As an example, the ratio of the radial width W3 of the partition 3 to the minimum radial width W21 of the corresponding ventilation hole 2 can be between 1 / 20 and 1 / 10, for example, between 1 / 16 and 1 / 12.
[0068] In this disclosure, by making the ratio of the radial width W3 of the partition 3 to the minimum radial width W21 of the ventilation hole 2 less than or equal to 1 / 10, the partition 3 will not excessively occupy the area of the ventilation hole 2, thereby ensuring that the motor has sufficient cooling efficiency.
[0069] refer to Figure 2 The rotor laminations also include a magnetically conductive radial portion 4 ( Figure 2 (roughly indicated by the dashed rectangular frame), the radial portion 4 separates two adjacent ventilation holes 2, and the circumferential width W4 of the radial portion 4 is constant.
[0070] As an example, multiple ventilation holes 2 and multiple radial portions 4 are arranged alternately along the circumferential direction C, and the partition 3 can extend between two adjacent radial portions 4.
[0071] As an example, the circumferential width W4 of the radial portion 4 can be 10mm to 15mm, for example, 12mm to 14mm, or 11mm to 13mm. It should be understood that the circumferential width W4 of the radial portion 4 is not limited to this, and can be increased or decreased depending on the application, etc.
[0072] In this disclosure, by keeping the circumferential width W4 of the radial portion 4 constant, the magnetic field can be uniformly distributed in the radial portion 4, thereby reducing magnetic leakage and lowering losses.
[0073] refer to Figure 2 The ratio of the circumferential width W4 of the radial portion 4 to the maximum circumferential width W22 of any one of the two corresponding ventilation holes 2 is greater than or equal to 1 / 4.
[0074] Here, the two corresponding ventilation holes 2 refer to the two ventilation holes 2 that are separated by the radial part 4.
[0075] As an example, when the ventilation hole 2 has a fan-shaped ring, the maximum circumferential width W22 of the ventilation hole 2 can be the length of the arc-shaped edge of the ventilation hole 2 located on the radially outer side.
[0076] As an example, the ratio of the circumferential width W4 of the radial portion 4 to the maximum circumferential width W22 of any one of the two corresponding ventilation holes 2 can be between 1 / 4 and 1 / 2.
[0077] In this disclosure, by making the ratio of the circumferential width W4 of the radial portion 4 to the maximum circumferential width W22 of the ventilation hole 2 greater than or equal to 1 / 4, the ventilation hole 2 will not excessively occupy the space of the radial portion 4, thereby ensuring that the motor has a sufficient power factor.
[0078] refer to Figure 2 The ratio of the maximum radial width W3 of the partition 3 to the circumferential width W4 of the radial part 4 is less than or equal to 1 / 4.
[0079] With the radial width of the partition 3 constant, the minimum radial width and the maximum radial width of the partition 3 are equal, and can be collectively referred to as the radial width of the ventilation hole 3. Therefore, in this embodiment, the radial width, minimum radial width, and maximum radial width of the partition 3 can all be indicated by the same reference numeral W3.
[0080] As an example, the ratio of the maximum radial width W3 of the partition 3 to the circumferential width W4 of the radial part 4 can be between 1 / 8 and 1 / 4, for example, between 1 / 6 and 1 / 5.
[0081] In this disclosure, by making the ratio of the maximum radial width W3 of the partition 3 to the circumferential width W4 of the radial portion 4 less than or equal to 1 / 4, the partition 3 will not excessively occupy the area of the ventilation hole 2, thereby ensuring that the motor has sufficient cooling efficiency.
[0082] refer to Figure 2 The rotor laminations also include a magnetically conductive outer peripheral portion 5, which separates the conductor groove 1 from the ventilation hole 2. The radial width W5 of the outer peripheral portion 5 is constant.
[0083] As an example, the outer peripheral portion 5 can have a fan-shaped ring.
[0084] In this disclosure, by keeping the radial width W5 of the outer peripheral portion 5 constant, the magnetic field can be uniformly distributed in the outer peripheral portion 5, thereby reducing magnetic leakage and lowering losses.
[0085] refer to Figure 2 The ratio of the radial width W5 of the outer peripheral part 5 to the maximum radial width W21 of the corresponding ventilation hole 2 is greater than or equal to 1 / 3.
[0086] Here, the corresponding ventilation hole 2 refers to the ventilation hole 2 that is separated by the outer peripheral part 5.
[0087] As an example, the ratio of the radial width W5 of the outer peripheral portion 5 to the maximum radial width W21 of the corresponding ventilation hole 2 can be between 1 / 3 and 1 / 2.
[0088] In this disclosure, by making the ratio of the radial width W5 of the outer peripheral portion 5 to the maximum radial width of the ventilation hole 2 greater than or equal to 1 / 3, the ventilation hole 2 will not excessively occupy the space of the outer peripheral portion 5, thereby ensuring that the motor has a sufficient power factor.
[0089] refer to Figure 1 and Figure 2 The rotor laminations also include a central hole 6, which passes through the rotor laminations axially and is located radially inside the plurality of ventilation holes 2. The central hole 6 is used to receive the rotor shaft (not shown). The rotor laminations also include a magnetically conductive inner circumferential portion 7, which separates the ventilation holes 2 from the central hole 6. The radial width W7 of the inner circumferential portion 7 is constant.
[0090] As an example, the inner circumferential portion 7 can have a fan-shaped ring.
[0091] In this disclosure, by keeping the radial width W7 of the inner circumferential portion 7 constant, the magnetic field can be uniformly distributed in the inner circumferential portion 7, thereby reducing magnetic leakage and lowering losses.
[0092] refer to Figure 2 The ratio of the radial width W7 of the inner circumferential portion 7 to the maximum radial width W21 of the corresponding ventilation hole 2 is greater than or equal to 1 / 3.
[0093] Here, the corresponding ventilation hole 2 refers to the ventilation hole 2 that is separated by the inner circumferential part 7.
[0094] As an example, the ratio of the radial width W7 of the inner circumferential portion 7 to the maximum radial width W21 of the corresponding ventilation hole 2 can be between 1 / 3 and 1 / 2.
[0095] In this disclosure, by making the ratio of the radial width W7 of the inner circumferential portion 7 to the maximum radial width W21 of the ventilation hole 2 greater than or equal to 1 / 3, the ventilation hole 2 will not excessively occupy the space of the inner circumferential portion 7, thereby ensuring that the motor has a sufficient power factor.
[0096] This disclosure also provides an electric motor rotor comprising: rotor laminations as described above; a rotor shaft, wherein a plurality of rotor laminations are stacked together and mounted on the rotor shaft; and rotor conductors received in conductor slots 1 of the rotor laminations.
[0097] This disclosure also provides an electric motor that includes a motor rotor as described above.
[0098] The above are merely preferred embodiments of this disclosure. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this disclosure, and these improvements and modifications should also be considered within the scope of protection of this disclosure.
Claims
1. A rotor lamination, characterized in that, include: Multiple conductor slots (1) are arranged axially through the rotor laminations and circumferentially (C), each conductor slot (1) being used to receive a rotor conductor therein; Multiple ventilation holes (2) are arranged axially through the rotor laminations and circumferentially (C), each ventilation hole (2) is used for airflow through, the multiple ventilation holes (2) are arranged radially inside the multiple conductor grooves (1), and each ventilation hole (2) is radially aligned with at least two of the multiple conductor grooves (1); as well as Multiple magnetically conductive partitions (3), each partition (3) extending across the corresponding ventilation hole (2) in the circumferential direction (C) to form multiple ventilation sections (21) separated by the partitions (3) in the ventilation hole (2).
2. The rotor laminations according to claim 1, characterized in that, The radial width (W3) of the partition (3) is constant.
3. The rotor laminations according to claim 2, characterized in that, The ratio of the radial width (W3) of the partition (3) to the minimum radial width (W21) of the corresponding ventilation hole (2) is less than or equal to 1 / 10.
4. The rotor laminations according to any one of claims 1 to 3, characterized in that, The rotor laminations also include a magnetically conductive radial portion (4), which separates two adjacent ventilation holes (2), and the circumferential width (W4) of the radial portion (4) is constant.
5. The rotor laminations according to claim 4, characterized in that, The ratio of the circumferential width (W4) of the radial portion (4) to the maximum circumferential width (W22) of any one of the two corresponding ventilation holes (2) is greater than or equal to 1 / 4.
6. The rotor laminations according to claim 4, characterized in that, The ratio of the maximum radial width (W3) of the partition (3) to the circumferential width (W4) of the radial portion (4) is less than or equal to 1 / 4.
7. The rotor laminations according to any one of claims 1 to 3, characterized in that, The rotor laminations also include a magnetically conductive outer peripheral portion (5), which separates the conductor groove (1) from the ventilation hole (2), and the radial width (W5) of the outer peripheral portion (5) is constant.
8. The rotor laminations according to claim 7, characterized in that, The ratio of the radial width (W5) of the outer peripheral portion (5) to the maximum radial width (W21) of the corresponding ventilation hole (2) is greater than or equal to 1 / 3.
9. The rotor laminations according to any one of claims 1 to 3, characterized in that, The rotor laminations also include a central hole (6) that passes through the rotor laminations axially and is located radially inside the plurality of ventilation holes (2). The central hole (6) is used to receive the rotor shaft. The rotor laminations also include a magnetically conductive inner circumferential portion (7), which separates the ventilation hole (2) from the central hole (6), and the radial width (W7) of the inner circumferential portion (7) is constant.
10. The rotor laminations according to claim 9, characterized in that, The ratio of the radial width (W7) of the inner circumferential portion (7) to the maximum radial width (W21) of the corresponding ventilation hole (2) is greater than or equal to 1 / 3.
11. A motor rotor, characterized in that, include: Rotor laminations as claimed in any one of claims 1 to 10; A rotor shaft, on which multiple rotor laminations are stacked together and mounted; as well as The rotor conductor is received in the conductor slot (1) of the rotor lamination.
12. An electric motor, characterized in that, include: The motor rotor as described in claim 11.