Rotor punching sheet, rotor of motor and compressor
By designing rotor punches with specific magnet slots and air gap slot layouts, the problems of insufficient mechanical strength of existing motor rotors and high magnetic flux of permanent magnets are solved, and a rotor design with lower wind resistance and higher structural strength is achieved.
Patent Information
- Application Number
- CN202411915389.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-24
- Publication Date
- 2025-04-11
AI Technical Summary
The width of the magnetic isolation bridge of the existing motor rotor is too small, resulting in insufficient mechanical strength, while the width is too large, which will increase the leakage flux of the permanent magnet and reduce utilization.
A rotor punching piece is designed, with a plurality of magnet slot holes arranged in an array along the circumferential direction. Each magnet slot hole divides the rotor punching piece into two parts on the inner and outer sides. The connection between the center of mass of the outer rotor punching piece and the center of the rotor punching piece forms a middle division line. The air gap slot hole extends at the end of the magnet slot hole to form a first and second magnetic isolation bridge. The extension direction of the second magnetic isolation bridge forms a certain angle with the division line in the magnet slot hole and is arranged inclined.
By optimizing the layout of the magnetic isolation bridge, the wind resistance of the rotor when it rotates is reduced, and the structural strength of the rotor is improved, avoiding the increase in leakage flux of the permanent magnet.
Smart Images
Figure CN119813597A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of motors, and in particular relates to a rotor punching sheet, a rotor of a motor and a compressor. Background Art
[0002] The motor includes a stator and a rotor, and the rotor includes a rotor core, a rotating shaft and multiple permanent magnets, wherein the rotor core is provided with multiple magnet slots which are distributed in an array along the circumferential direction of the rotor core and whose number is equal to the number of permanent magnets, and each permanent magnet is arranged in one of the magnet slots, and each magnet slot divides the rotor core into two parts, inner and outer parts, which are respectively called inner rotor core and outer rotor core, wherein the inner rotor core and the outer rotor core corresponding to each magnet slot are connected through a magnetic isolation bridge, and the width L of the magnetic isolation bridge determines the mechanical strength of the rotor, wherein if the width L of the magnetic isolation bridge is too small, the mechanical strength of the rotor will be reduced, and if the width L of the magnetic isolation bridge is too large, the leakage flux of the permanent magnet in the corresponding magnet slot will increase, thereby reducing the utilization rate of the permanent magnet in the corresponding magnet slot.
[0003] In the prior art, the magnetic isolation bridge between the inner rotor core and the outer rotor core corresponding to each magnet slot is generally a one-stage structure, and is generally approximately distributed tangentially along the outer periphery of the outer rotor core or perpendicular to the line between the mass center of the outer rotor core and the center of the rotor circle; if the magnetic isolation bridge 12 is approximately distributed tangentially along the outer periphery of the outer rotor core 7, it can be seen that Figure 1 and Figure 2 In order to ensure the utilization rate of the permanent magnets 9 in the corresponding magnet slots 1, the width L of the magnetic isolation bridge 12 is relatively small, which will make the structural strength of the rotor relatively low. Figure 1 and Figure 2 The width L of the middle magnetic bridge 12 is 0.78 mm; if the magnetic bridge is approximately perpendicular to the line between the center of mass of the outer rotor core and the center of the rotor, the circular structure of the outer peripheral surface of the outer rotor core will be destroyed, which will increase the wind resistance of the rotor. Summary of the invention
[0004] In view of the above-mentioned defects of the prior art, the present invention provides a rotor punching sheet, a rotor of a motor and a compressor. A plurality of the rotor punching sheets are stacked to form a rotor core. The rotor including the rotor core has a small wind resistance during rotation and has sufficient structural strength.
[0005] The technical solution adopted by the present invention to solve the technical problem is:
[0006] A rotor punching, wherein a plurality of magnet slots are arranged in an array along a circumferential direction on the rotor punching, each of the magnet slots divides the rotor punching into two parts, inner and outer, respectively called inner rotor punching and outer rotor punching, wherein a line connecting the centroid of the outer rotor punching and the center of the circle of the rotor punching forms a centerline of the corresponding magnet slot, and an air gap slot is arranged on the rotor punching at a position extending in the direction of the outer edge of the rotor punching at each end of each magnet slot, a first magnetic isolation bridge is formed between a first side of the air gap slot and the outer edge of the rotor punching at a corresponding position, a second magnetic isolation bridge is formed between a second side of the air gap slot and the corresponding end of the corresponding magnet slot, a certain angle is formed between the extension direction of the second magnetic isolation bridge and the centerline direction of the corresponding magnet slot, and the second magnetic isolation bridge is arranged obliquely toward the rotation direction of the rotor punching.
[0007] Furthermore, a first side of the air gap slot is parallel to a tangential direction of an outer edge of a rotor punching sheet, a second side of the air gap slot is parallel to a side of a corresponding end of the magnet slot, and a third side of the air gap slot is arranged in parallel to a third side of an air gap slot at a corresponding end of an adjacent magnet slot.
[0008] Furthermore, the third side of the air gap slot is perpendicular to the tangent direction of the outer edge at the corresponding position of the rotor punching sheet.
[0009] Furthermore, the width of the first magnetic isolation bridge is L1, the width of the second magnetic isolation bridge is L2, and L1+L2≤1.5 mm, and L1 and L2 are both greater than or equal to 0.25 mm.
[0010] Furthermore, the width L1 of the first magnetic isolation bridge is equal to the width L2 of the second magnetic isolation bridge.
[0011] Furthermore, the width L1 of the first magnetic isolation bridge and the width L2 of the second magnetic isolation bridge are both 0.3 mm.
[0012] Furthermore, an angle A is formed between an extension direction of the second magnetic isolation bridge and a bisecting line direction of the corresponding magnet slot, wherein 5°≤A≤15°.
[0013] Furthermore, the angle formed between the extension direction of the second magnetic isolation bridge and the bisecting line direction of the corresponding magnet slot is 8°.
[0014] A rotor of an electric motor comprises a rotor core, a rotating shaft and a plurality of permanent magnets, wherein the rotor core is formed by laminating a plurality of rotor punchings as described in any one of claims 1 to 8, the number of magnet slots on the rotor punchings being equal to the number of permanent magnets, each magnet slot on each rotor punching corresponds to the position of the corresponding magnet slot of an adjacent rotor punching and is spliced to form a total magnet slot, each permanent magnet is arranged in a corresponding total magnet slot, and each air gap slot on each rotor punching corresponds to the position of the corresponding air gap slot of an adjacent rotor punching and is spliced to form a total air gap slot.
[0015] A compressor comprises a stator and the above-mentioned rotor.
[0016] Compared with the prior art, the beneficial effects of the present invention are:
[0017] The rotor punching in the present invention has a plurality of magnet slots arranged in an array along the circumferential direction, each magnet slot divides the rotor punching into two parts, inner and outer, respectively called inner rotor punching and outer rotor punching, wherein the line between the centroid of the outer rotor punching and the center of the circle of the rotor punching forms the centerline of the corresponding magnet slot, and the rotor punching is provided with air gap slots at each end of each magnet slot extending in the direction of the outer edge of the rotor punching, a first magnetic isolation bridge is formed between the first side of the air gap slot and the outer edge at the corresponding position of the rotor punching, a second magnetic isolation bridge is formed between the second side of the air gap slot and the corresponding end of the corresponding magnet slot, a certain angle is formed between the extension direction of the second magnetic isolation bridge and the centerline direction of the corresponding magnet slot, and the second magnetic isolation bridge is arranged obliquely toward the rotation direction of the rotor punching. Since the first magnetic isolation bridge is formed between the first side of the air gap slot and the outer edge at the corresponding position of the rotor punching, and the first side of the air gap slot is parallel to the tangential direction of the outer edge of the rotor punching, the first magnetic isolation bridge is distributed tangentially along the outer edge of the rotor punching, so that the outer edge of the rotor punching is close to a full circle, and then the outer circumferential surface of the rotor core formed by stacking multiple rotor punchings is close to a full circle, which is beneficial to reduce the wind resistance of the rotor including the rotor core during rotation; since a certain angle is formed between the extension direction of the second magnetic isolation bridge and the direction of the center line of the corresponding magnet slot, and they are arranged inclined toward the rotation direction of the rotor punching, and multiple rotor punchings are stacked to form the rotor core, the radial centrifugal force, radial electromagnetic force and tangential electromagnetic force of the corresponding outer rotor core formed by the combination of the corresponding outer rotor punchings of the multiple rotor punchings can be fully considered, then when the rotor including the rotor core rotates, each second magnetic isolation bridge can provide a certain tensile strength, so that the rotor including the rotor core has sufficient structural strength. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic structural diagram of a magnetic isolation bridge in an existing rotor core in the background technology, which is approximately distributed tangentially along the outer peripheral surface of the outer rotor core;
[0019] Figure 2 For Figure 1 A schematic diagram showing the dimensioning of some of the magnetic separation bridges in FIG.
[0020] Figure 3 It is a schematic diagram of the structure of the rotor punching in the present invention;
[0021] Figure 4 For Figure 3 A schematic diagram of the first magnetic isolation bridge and the second magnetic isolation bridge in which the dimensions are marked;
[0022] Figure 5 It is a schematic structural diagram of a rotor core formed by laminating a plurality of rotor punchings of the present invention and a permanent magnet disposed in the rotor core;
[0023] Figure 6 For Figure 5 Schematic diagram of the dimensioning of the first magnetic isolation bridge and the second magnetic isolation bridge in FIG.
[0024] Explanation of the reference numerals in the figure: 1. magnet slot, 2. inner rotor punching sheet, 3. outer rotor punching sheet, 4. air gap slot, 5. first magnetic isolation bridge, 6. second magnetic isolation bridge, 7. outer rotor core, 8. inner rotor core, 9. permanent magnet, 10. total magnet slot, 11. total air gap slot, 12. magnetic isolation bridge. DETAILED DESCRIPTION
[0025] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.
[0026] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.
[0027] like Figure 3 and Figure 4As shown, a rotor punching sheet is provided with a plurality of magnet slots 1 arranged in an array along a circumferential direction on the rotor punching sheet, each end of each magnet slot 1 points to the outer edge of the rotor punching sheet, each magnet slot 1 divides the rotor punching sheet into two parts, inner and outer, which are respectively called inner rotor punching sheet 2 and outer rotor punching sheet 3, wherein a line connecting the centroid of the outer rotor punching sheet 3 and the center of the rotor punching sheet forms a center dividing line of the corresponding magnet slot 1, and air gap slots are arranged on the rotor punching sheet at a position extending in a direction from each end of each magnet slot 1 to the outer edge of the rotor punching sheet. 4, a first magnetic isolation bridge 5 is formed between the first side of the air gap slot 4 and the outer edge at the corresponding position of the rotor punching, wherein the first side of the air gap slot 4 is parallel to the tangential direction of the outer edge of the rotor punching, and a second magnetic isolation bridge 6 is formed between the second side of the air gap slot 4 and the corresponding end of the corresponding magnet slot 1, and the second side of the air gap slot 4 is parallel to one side of the corresponding end of the magnet slot 1, and the extension direction of the second magnetic isolation bridge 6 forms a certain angle with the direction of the center line of the corresponding magnet slot 1, and is arranged tilted toward the rotation direction of the rotor punching. Figure 3 and Figure 4 The direction indicated by the arrow at D is the rotation direction of the rotor punching. Figure 4 The double-dotted dash line indicated by the arrow at B represents the center line of the magnet slot hole 1.
[0028] Since a first magnetic isolation bridge 5 is formed between the first side of the air gap slot 4 and the outer edge at the corresponding position of the rotor punching, wherein the first side of the air gap slot 4 is parallel to the tangential direction of the outer edge of the rotor punching, the first magnetic isolation bridge 5 is tangentially distributed along the outer edge of the rotor punching, so that the outer edge of the rotor punching is close to a full circle, and then the outer peripheral surface of the rotor core formed by stacking a plurality of the rotor punchings is close to a full circle, which is beneficial to reduce the wind resistance of the rotor including the rotor core during rotation; since a certain angle is formed between the extension direction of the second magnetic isolation bridge 6 and the direction of the midline of the corresponding magnet slot 1, and they are arranged inclined toward the rotation direction of the rotor punching, and a plurality of the rotor punchings are stacked to form the rotor core, the radial centrifugal force, radial electromagnetic force and tangential electromagnetic force of the corresponding outer rotor core 7 formed by the combination of the corresponding outer rotor punchings 3 of the plurality of the rotor punchings can be fully considered, then when the rotor including the rotor core rotates, each second magnetic isolation bridge 6 can provide a certain tensile strength, so that the rotor including the rotor core has sufficient structural strength.
[0029] Among them, Figure 3 As shown, the third side of the air gap slot 4 is arranged parallel to the third side of the air gap slot 4 at the corresponding end of the adjacent magnet slot 1.
[0030] Preferably, if Figure 3 and Figure 4 As shown, the third side of the air gap slot 4 is perpendicular to the tangent direction of the outer edge of the rotor punching at the corresponding position.
[0031] Among them, Figure 4 As shown, the width of the first magnetic isolation bridge 5 is L1, the width of the second magnetic isolation bridge 6 is L2, and L1+L2≤1.5mm, and L1 and L2 are both greater than or equal to 0.25mm. This can ensure the stamping production operability of the rotor punching.
[0032] Preferably, the width L1 of the first magnetic isolation bridge 5 is equal to the width L2 of the second magnetic isolation bridge 6 .
[0033] Preferably, the width L1 of the first magnetic isolation bridge 5 and the width L2 of the second magnetic isolation bridge 6 are both 0.3 mm.
[0034] Among them, Figure 4 As shown, the angle formed between the extension direction of the second magnetic isolation bridge 6 and the midline direction of the corresponding magnet slot 1 is A, where 5°≤A≤15°. In this way, the extension direction of each second magnetic isolation bridge 6 is approximately parallel to the midline direction of the corresponding magnet slot 1.
[0035] Preferably, the angle formed between the extension direction of the second magnetic isolation bridge 6 and the bisecting line direction of the corresponding magnet slot hole 1 is 8°.
[0036] In one embodiment of the present invention, the width L1 of the first magnetic isolation bridge 5 and the width L2 of the second magnetic isolation bridge 6 of the rotor sheet are both 0.3 mm, and the angle formed between the extension direction of each second magnetic isolation bridge 6 and the direction of the midline of the corresponding magnet slot 1 is 8°. Thus, compared with the ability of the outer rotor core 7 in the rotor core with a one-stage magnetic isolation bridge 12 with a width of 0.78 mm in the background technology in terms of resisting radial centrifugal force, radial electromagnetic force and tangential electromagnetic force, the corresponding outer rotor core 7 formed by the combination of the corresponding outer rotor sheets 3 of the rotor sheets in this embodiment has the same ability as that in the background technology in terms of resisting radial centrifugal force, radial electromagnetic force and tangential electromagnetic force, and compared with the simulated leakage flux of the permanent magnet 9 set in the rotor core with a one-stage magnetic isolation bridge 12 with a width of 0.78 mm in the background technology, the simulated leakage flux of the permanent magnet 9 set in the rotor core formed by stacking multiple rotor sheets in this embodiment is reduced by 25%.
[0037] A rotor of a motor comprises a rotor core, a rotating shaft and a plurality of permanent magnets 9, wherein the rotor core is formed by laminating a plurality of the above-mentioned rotor punchings, wherein the number of magnet slots 1 on the rotor punchings is equal to the number of permanent magnets 9, wherein each magnet slot 1 on each rotor punching corresponds to the position of the corresponding magnet slot 1 on the adjacent rotor punchings and is spliced to form a total magnet slot 10, wherein each permanent magnet 9 is arranged in the corresponding total magnet slot 10, and each air gap slot 4 on each rotor punching corresponds to the position of the corresponding air gap slot 4 on the adjacent rotor punchings and is spliced to form a total air gap slot 11, see Figure 5 and Figure 6 .in Figure 5 and Figure 6 The direction indicated by the arrow at D is the direction of rotation of the rotor, where Figure 6 The double-dotted dash line indicated by the arrow at C in the figure represents the midline of the total magnet slot hole 10. Figure 6 A in the figure represents the angle formed between the extension direction of the second magnetic isolation bridge 6 and the midline direction of the corresponding total magnet slot hole 10 .
[0038] A compressor comprises a stator and the above-mentioned rotor. The compressor in the present invention is a compressor suitable for refrigeration or heating circulation systems such as air conditioners, refrigerators, and heat pump water heaters.
[0039] In summary, in the present invention, the permanent magnet 9 arranged in the rotor core formed by stacking multiple rotor punchings has less leakage flux, the stamping production operability of the rotor punchings is strong, and the rotor including the rotor core has less wind resistance during rotation and has sufficient structural strength.
[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.
Claims
1. A rotor punching, characterized in that: A plurality of magnet slots (1) are arranged in an array along the circumferential direction on the rotor punching sheet, each of the magnet slots (1) divides the rotor punching sheet into two parts, inner and outer, respectively, which are called inner rotor punching sheet (2) and outer rotor punching sheet (3), wherein the line between the mass center of the outer rotor punching sheet (3) and the center of the rotor punching sheet forms the center line of the corresponding magnet slot (1), and an air gap slot (4) is arranged on the rotor punching sheet at each end of each magnet slot (1) in the direction of extension of the outer edge of the rotor punching sheet, a first magnetic isolation bridge (5) is formed between the first side of the air gap slot (4) and the outer edge at the corresponding position of the rotor punching sheet, and a second magnetic isolation bridge (6) is formed between the second side of the air gap slot (4) and the corresponding end of the corresponding magnet slot (1), the extension direction of the second magnetic isolation bridge (6) forms a certain angle with the direction of the center line of the corresponding magnet slot (1), and is arranged obliquely toward the rotation direction of the rotor punching sheet.
2. A rotor punching according to claim 1, characterized in that: The first side of the air gap slot (4) is parallel to the tangential direction of the outer edge of the rotor punching sheet, the second side of the air gap slot (4) is parallel to a side of the corresponding end of the magnet slot (1), and the third side of the air gap slot (4) is arranged in parallel to the third side of the air gap slot (4) at the corresponding end of the adjacent magnet slot (1).
3. A rotor punching according to claim 2, characterized in that: The third side of the air gap slot (4) is perpendicular to the tangent direction of the outer edge at the corresponding position of the rotor punching sheet.
4. A rotor punching according to claim 1, characterized in that: The width of the first magnetic isolation bridge (5) is L1, the width of the second magnetic isolation bridge (6) is L2, and L1+L2≤1.5 mm, and L1 and L2 are both greater than or equal to 0.25 mm.
5. A rotor punching according to claim 4, characterized in that: The width L1 of the first magnetic isolation bridge (5) is equal to the width L2 of the second magnetic isolation bridge (6).
6. A rotor punching according to claim 5, characterized in that: The width L1 of the first magnetic isolation bridge (5) and the width L2 of the second magnetic isolation bridge (6) are both 0.3 mm.
7. A rotor punching according to claim 1, characterized in that: The angle formed between the extension direction of the second magnetic isolation bridge (6) and the bisecting line direction of the corresponding magnet slot hole (1) is A, wherein 5°≤A≤15°.
8. A rotor punching according to claim 7, characterized in that: The angle formed between the extension direction of the second magnetic isolation bridge (6) and the midline direction of the corresponding magnet slot hole (1) is 8°.
9. A rotor of a motor, comprising a rotor core, a rotating shaft and a plurality of permanent magnets (9), characterized in that: The rotor core is formed by stacking a plurality of rotor punchings as described in any one of claims 1 to 8, the number of magnet slots (1) on the rotor punchings is equal to the number of permanent magnets (9), each magnet slot (1) on each rotor punching corresponds to the position of the corresponding magnet slot (1) of the adjacent rotor punching and is spliced to form a total magnet slot (10), each permanent magnet (9) is arranged in a corresponding total magnet slot (10), and each air gap slot (4) on each rotor punching corresponds to the position of the corresponding air gap slot (4) of the adjacent rotor punching and is spliced to form a total air gap slot (11).
10. A compressor comprising a stator and the rotor according to claim 9.