A rotor punching sheet, a rotor iron core, a motor and an air conditioner

Abstract

The present invention provides a rotor punching, a rotor core, a motor and an air conditioner, and relates to the field of motor technology. The rotor punching comprises: a punching body, a plurality of magnetic steel slots arranged at intervals are provided on the punching body, and at least one air avoidance slot is also provided on the punching body, and the air avoidance slot is arranged between two adjacent magnetic steel slots, and there is a gap between the air avoidance slot and the two adjacent magnetic steel slots. The rotor punching provided by the present invention is provided with an air avoidance slot between two adjacent magnetic steel slots, so as to divide the original magnetic isolation bridge into two smaller magnetic isolation bridges, and reduce the total length of the magnetic isolation bridge between two adjacent magnetic steel slots, so as to reduce the magnetic leakage of the rotor during operation. At the same time, compared with the increase in the area of ​​the empty slot part caused by increasing the width of the magnetic steel slot, the increase in the area of ​​the empty slot part caused by setting the air avoidance slot is smaller, so the impact on the mechanical strength of the rotor punching is smaller, and the maximum speed of the rotor will not be greatly affected.

Description

Technical Field

[0001] The present invention relates to the field of motors, and in particular to a rotor punching sheet, a rotor core, a motor and an air conditioner. Background Art

[0002] The rotor core is an important component of the motor. The rotor core is made up of several rotor laminations stacked together. For built-in permanent magnet motors, in order to avoid magnetic leakage, magnetic isolation bridges are set on the rotor laminations. There are several magnetic steel slots set at intervals on the rotor laminations, and the smallest interval between two adjacent magnetic steel slots is the magnetic isolation bridge.

[0003] When setting up the magnetic isolation bridge, the wider the magnetic isolation bridge is, the greater the magnetic leakage of the rotor during operation, which affects the performance of the motor and fails to achieve the purpose of magnetic isolation.

[0004] Therefore, to ensure the performance of the motor, the narrower the magnetic isolation bridge is, the better. The narrower the magnetic isolation bridge is, the less magnetic leakage the rotor will have during operation, the higher the utilization rate of permanent magnetic materials (magnetic steel), and the better the motor performance. However, in order to make the magnetic isolation bridge narrower, the width of the magnetic steel slot must be increased, thereby reducing the ratio of the solid part to the empty slot part on the rotor punching, resulting in a decrease in the mechanical strength of the rotor punching, thereby limiting the maximum speed of the motor rotor and reducing the motor performance. Summary of the invention

[0005] The invention provides a rotor punching sheet, a rotor core, a motor and an air conditioner, aiming to improve the problem that the mechanical strength of the rotor punching sheet is reduced due to the narrow magnetic isolation bridge on the existing rotor punching sheet.

[0006] The present invention is achieved in that:

[0007] A rotor punching sheet comprises: a punching sheet body, on which a plurality of magnetic steel slots are arranged at intervals, and on which at least one air avoidance slot is provided, wherein the air avoidance slot is arranged between two adjacent magnetic steel slots, and there is a gap between the air avoidance slot and the two adjacent magnetic steel slots.

[0008] Furthermore, in a preferred embodiment of the present invention, there are a plurality of air avoidance grooves, and an air avoidance groove is provided between every two adjacent magnetic steel grooves.

[0009] Furthermore, in a preferred embodiment of the present invention, there are a plurality of air avoidance grooves, and each two adjacent magnetic steel grooves form a magnetic steel groove group, and an air avoidance groove is provided between the two magnetic steel grooves in each magnetic steel groove group.

[0010] Furthermore, in a preferred embodiment of the present invention, each of the air avoidance grooves has a first side and a second side relative to each other, and a connecting groove is provided on the gap between the magnetic steel groove adjacent to the first side of the air avoidance groove and the air avoidance groove, and the connecting groove is used to connect the air avoidance groove and the magnetic steel groove.

[0011] Furthermore, in a preferred embodiment of the present invention, the distance from the first side of the air avoidance groove to the adjacent magnetic steel groove is greater than the distance from the second side of the air avoidance groove to the adjacent magnetic steel groove.

[0012] Furthermore, in a preferred embodiment of the present invention, the distance from the first side of the air-avoiding groove to the adjacent magnetic steel groove is equal to the distance from the second side of the air-avoiding groove to the adjacent magnetic steel groove.

[0013] Furthermore, in a preferred embodiment of the present invention, the air avoidance groove is a circular through hole, a diamond through hole, a rectangular through hole or an elliptical through hole.

[0014] A rotor core comprises a plurality of stacked punching sheets, wherein the punching sheets are any of the rotor punching sheets described above.

[0015] Furthermore, in a preferred embodiment of the present invention, each of the air avoidance grooves has a first side and a second side relative to each other, and a connecting groove is provided on the gap between the magnetic steel groove adjacent to the first side of the air avoidance groove and the air avoidance groove, and the connecting groove is used to connect the air avoidance groove and the magnetic steel groove, and the two adjacent punching sheets are mirror-symmetrical.

[0016] A motor comprises the rotor core described in any one of the above items.

[0017] An air conditioner comprises the above-mentioned motor.

[0018] The beneficial effect of the present invention is that the rotor punching obtained by the present invention through the above design is provided with an air-avoiding groove between two adjacent magnetic steel slots, and there is a gap between the air-avoiding groove and the two adjacent magnetic steel slots, that is, the air-avoiding groove is provided on the magnetic isolation bridge between the two adjacent magnetic steel slots, and the original magnetic isolation bridge is divided into two smaller magnetic isolation bridges (i.e., two gaps), and the total length of the magnetic isolation bridge between the two adjacent magnetic steel slots is reduced. That is, the total length of the two smaller magnetic isolation bridges (gaps) is less than the distance between the two adjacent magnetic steel slots. Therefore, the present invention reduces the total length of the magnetic isolation bridge between the two adjacent magnetic steel slots (narrows the magnetic isolation bridge) by providing the air-avoiding groove, so that the magnetic leakage of the rotor during operation is reduced. At the same time, compared with the increase in the area of ​​the empty slot part caused by increasing the width of the magnetic steel slot, the increase in the area of ​​the empty slot part caused by providing the air-avoiding groove is smaller, so the impact on the mechanical strength of the rotor punching is smaller, and the maximum speed of the rotor will not be greatly affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a top view of a rotor punching provided by an embodiment of the present invention;

[0021] Figure 2 is a top view of a rotor core provided by an embodiment of the present invention;

[0022] Figure 3 yes Figure 2 Cross-sectional view along the A-A' direction;

[0023] Figure 4 It is a top view of another implementation manner of a rotor punching provided in an embodiment of the present invention.

[0024] Icon: punching sheet body 1; magnetic steel groove 11; air avoidance groove 12; connecting groove 13; magnetic isolation bridge 14. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] Example 1, please refer to Figure 1-Figure 3 As shown, this embodiment provides a rotor punching, including: a punching body 1, a plurality of spaced magnetic steel slots 11 are provided on the punching body 1, a space-avoiding slot 12 is provided between each two adjacent magnetic steel slots 11, and there is a gap between the space-avoiding slot 12 and the two adjacent magnetic steel slots 11. Specifically, there is a magnetic isolation bridge 14 between each two adjacent magnetic steel slots 11, and the space-avoiding slot 12 is provided on the magnetic isolation bridge 14, dividing one magnetic isolation bridge 14 into two. In this embodiment, the punching body 1 is a circular sheet structure, the magnetic steel slot 11 is a rectangular through hole, and a plurality of magnetic steel slots 11 are arranged at equal intervals around the axis of the punching body 1, and the number of magnetic steel slots 11 is an even number. In other embodiments, the punching body 1 can also be a basic shape of existing motor punchings such as a plum blossom shape.

[0031] The rotor punching provided in this embodiment has a clearance groove 12 between two adjacent magnetic steel slots 11, and there is a gap between the clearance groove 12 and the two adjacent magnetic steel slots 11, that is, the clearance groove 12 is set on the magnetic isolation bridge 14 between the two adjacent magnetic steel slots 11, and the original magnetic isolation bridge 14 is divided into two smaller magnetic isolation bridges 14 (i.e., two gaps), and the total length of the magnetic isolation bridge 14 between the two adjacent magnetic steel slots 11 is reduced. That is, the total length of the two smaller magnetic isolation bridges 14 (gaps) is less than the distance between the two adjacent magnetic steel slots 11. Therefore, this embodiment reduces the total length of the magnetic isolation bridge 14 between the two adjacent magnetic steel slots 11 (narrows the magnetic isolation bridge 14) by setting the clearance groove 12, so that the magnetic leakage of the rotor during operation is reduced. At the same time, compared with the increase in the area of ​​the empty slot part caused by increasing the width of the magnetic steel slot 11, the increase in the area of ​​the empty slot part caused by setting the clearance groove 12 is smaller, so the impact on the mechanical strength of the rotor punching is smaller, and the maximum speed of the rotor will not be greatly affected.

[0032] In actual application, the opening position, groove area, groove shape and size of the air avoidance groove 12 can be flexibly selected according to actual conditions, so as to adapt to more design requirements, so that when designing motor punching sheets, the size and specifications of the magnetic steel groove 11 can be designed more flexibly.

[0033] For further information, please refer to Figure 1 As shown, in this embodiment, each air-avoiding slot 12 has a first side and a second side that are opposite to and respectively face the adjacent magnetic steel slot 11, and a connecting slot 13 is provided on the gap between the magnetic steel slot 11 and the air-avoiding slot 12 adjacent to the first side of the air-avoiding slot 12, and the connecting slot 13 is used to connect the air-avoiding slot 12 and the magnetic steel slot 11. Specifically, it can be embodied as follows: a connecting slot 13 connected to the adjacent magnetic steel slot 11 is provided on the same side of each air-avoiding slot 12. That is, the magnetic isolation bridge 14 on the same side of each air-avoiding slot 12 is hollowed out to form a connecting slot, so that only one magnetic isolation bridge 14 is left between the two adjacent magnetic steel slots 11, further narrowing the magnetic isolation bridge 14 between the two adjacent magnetic steel slots 11 and reducing magnetic leakage. In terms of intuitive visual embodiment, a connecting slot 13 and an air-avoiding slot 12 that are connected are provided on the same side of each magnetic steel slot 11.

[0034] For further information, please refer to Figure 1 As shown, in this embodiment, the distance from the first side of the air-avoiding slot 12 to the adjacent magnetic steel slot 11 is greater than the distance from the second side of the air-avoiding slot 12 to the adjacent magnetic steel slot 11. Alternatively, the distances between each air-avoiding slot 12 and two adjacent magnetic steel slots 11 are equal.

[0035] In actual application, there are two ways to select the position of the air-avoiding slot 12. One is to set the air-avoiding slot 12 in the middle of the two magnetic steel slots 11 so that the distances between the two air-avoiding slots 12 and the air-avoiding slot 12 are equal. The other is to set the air-avoiding slot 12 in a direction that is aligned with the second side of the air-avoiding slot 12, that is, the magnetic steel slot 11 that is closer to the second side. Setting the air-avoiding slot 12 in the middle of the two magnetic steel slots 11 can make the overall mechanical strength of the rotor punching stronger and more stable during operation because the structure is more symmetrical. Setting the air-avoiding slot 12 in a direction that is aligned with the second side of the air-avoiding slot 12, that is, increasing the length of the connecting slot 13 and reducing the length of the remaining magnetic isolation bridge 14, makes the magnetic isolation bridge 14 narrower, further reduces magnetic leakage, and improves motor performance.

[0036] For further information, please refer to Figure 1 As shown, in this embodiment, the shape of the air-avoiding groove 12 can be freely selected according to the design requirements, and there is no rigid regulation that it must be set to a fixed shape. In this embodiment, several specific implementations of the air-avoiding groove 12 are provided. In this embodiment, the air-avoiding groove 12 can be a circular through hole, a diamond through hole, a rectangular through hole, an elliptical through hole or an arched through hole.

[0037] Please refer to Figure 2 and Figure 3 As shown, in this embodiment, there is also a rotor core, comprising a plurality of stacked punching sheets, which are the above-mentioned rotor punching sheets, and in this embodiment, each air-avoiding slot 12 is arranged in the middle of two adjacent magnetic steel slots 11. When stacking, the corresponding magnetic steel slots 11 and air-avoiding slots 12 are kept overlapped.

[0038] For further information, please refer to Figure 2 and Figure 3 As shown, in this embodiment, each air avoidance groove 12 has a first side and a second side relative to each other, and a connecting groove 13 is provided on the gap between the magnetic steel groove 11 adjacent to the first side of the air avoidance groove 12 and the air avoidance groove 12, and the connecting groove 13 is used to connect the air avoidance groove 12 and the magnetic steel groove 11, and the two adjacent punching sheets are mirror-symmetrical.

[0039] Since each air-avoiding slot 12 has a magnetic isolation bridge 14 on only one side, the magnetic flux lines are offset to a certain extent during actual operation. In this embodiment, two adjacent punching sheets are arranged in a mirror image, that is, each two punching sheets form a group, and the two punching sheets are one positive and one negative. Specifically, for the two air-avoiding slots 12 at the same position, there is a magnetic isolation bridge 14 on the left side (or right side) of the upper air-avoiding slot 12, and there is a magnetic isolation bridge 14 on the right side (or left side) of the lower air-avoiding slot 12, so that the two magnetic isolation bridges 14 of the upper and lower layers can be offset to be equivalent to a conventional single magnetic isolation bridge 14, so that the magnetic flux lines are evenly distributed and will not be offset, thereby ensuring the performance of the motor.

[0040] This embodiment also provides a motor, which includes the above-mentioned rotor core.

[0041] This embodiment also provides an air conditioner, which includes the above-mentioned motor.

[0042] In other embodiments, the air-avoiding groove 12 may also have other implementations. Figure 4 In other embodiments, every two adjacent magnetic steel slots 11 form a magnetic steel slot group, and an air avoidance slot 12 is provided between the two magnetic steel slots 11 in each magnetic steel slot group, and no air avoidance slot 12 is provided between adjacent magnetic steel slot groups and adjacent magnetic steel slots 11.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotor punching, characterized in that: include: A punch body, wherein a plurality of magnetic steel grooves are arranged at intervals on the punch body, and at least one air-avoiding groove is also arranged on the punch body, wherein the air-avoiding groove is arranged between two adjacent magnetic steel grooves, and there is a gap between the air-avoiding groove and the two adjacent magnetic steel grooves; Each of the air-avoiding grooves has a first side and a second side that are opposite to and respectively face two adjacent magnetic steel grooves, and a connecting groove is provided on the gap between the magnetic steel groove adjacent to the first side of the air-avoiding groove and the air-avoiding groove, and the connecting groove is used to connect the air-avoiding groove and the magnetic steel groove; The rotor punching sheet is a centrally symmetrical structure, and two adjacent rotor punching sheets are mirror-symmetrical.

2. The rotor punching according to claim 1, characterized in that: There are a plurality of air avoidance grooves, and an air avoidance groove is provided between every two adjacent magnetic steel grooves.

3. The rotor punching according to claim 1, characterized in that: There are a plurality of air avoidance grooves, and each two adjacent magnetic steel grooves form a magnetic steel groove group. An air avoidance groove is provided between the two magnetic steel grooves in each magnetic steel groove group.

4. The rotor punching according to claim 1, characterized in that: The distance from the first side of the air-avoiding groove to the adjacent magnetic steel groove is greater than the distance from the second side of the air-avoiding groove to the adjacent magnetic steel groove.

5. The rotor punching according to claim 1, characterized in that: The distance from the first side of the air-avoiding groove to the adjacent magnetic steel groove is equal to the distance from the second side of the air-avoiding groove to the adjacent magnetic steel groove.

6. The rotor punching according to claim 1, characterized in that: The air avoidance groove is a circular through hole, a diamond through hole, a rectangular through hole or an elliptical through hole.

7. A rotor core, comprising a plurality of stacked sheets, characterized in that: The punching sheet is the rotor punching sheet according to any one of claims 1 to 6.

8. A motor, characterized in that: The motor comprises the rotor core according to claim 7.

9. An air conditioner, characterized in that: The air conditioner comprises the motor according to claim 8.

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