Motor rotor structure and compressor

Abstract

The utility model relates to the technical field of compressors, in particular to a motor rotor structure and a compressor comprising the motor rotor structure. The motor rotor structure comprises a rotor iron core, a plurality of accommodating grooves used for embedding magnets are formed in the rotor iron core in the axial direction, the accommodating grooves are distributed at intervals in the circumferential direction of the end face of the rotor iron core, magnetic isolation bridge holes are formed in the ends, close to the outer circle of the rotor iron core, of the accommodating grooves, and magnetic bundle arrangement grooves are formed between the accommodating grooves and the outer circle of the rotor iron core; and the end plate is arranged on the end face of the rotor iron core, the end plate is in a circular ring shape, the outer diameter of the end plate is smaller than that of the end face of the rotor iron core, and at least parts of the magnetic isolation bridge holes and the magnetic bundle arrangement grooves are exposed out of the end plate. The exposed magnetic isolation bridge holes and the magnetic bundle arrangement grooves are used as through-flow holes, so that the heat dissipation of the rotor iron core and the magnets can be improved, the demagnetization resistance of the magnets is improved, and the motor performance is improved; and the refrigerant flow area can be increased, the refrigerant flow resistance is reduced, the flow loss is reduced, and the performance of the compressor is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field especially relates to a motor rotor structure and a kind of compressor comprising the motor rotor structure. BACKGROUND

[0002] The motor rotor core of compressor is mainly stacked by the laminated sheet punched out by punch press from silicon steel sheet. Because silicon steel sheet is usually thin, it is easy to deform, so end plate is usually added to the both ends of rotor core, the end plate of both ends can clamp rotor core, play the role of protecting rotor core, and also can constrain magnet in the accommodating slot embedded in rotor core, prevent magnet from protruding rotor core.

[0003] The existing compressor motor usually adopts the rotor structure of end plate full-closed type, and the end plate completely covers the end surface of rotor core. This will increase the material consumption of end plate, and on the other hand, it will block the fluid from entering the vicinity of rotor magnet, which is not conducive to heat dissipation, and the temperature of magnet rises, the performance decreases, and the magnet anti-demagnetization decreases. SUMMARY

[0004] In view of the above defects of the prior art, the technical problem to be solved by the utility model is to provide a motor rotor structure, which can improve rotor heat dissipation and improve motor performance.

[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme:

[0006] The utility model provides a motor rotor structure, which comprises: a rotor core having a plurality of accommodating slots for embedding magnets along an axial direction, the plurality of accommodating slots being distributed at intervals along the circumferential direction of the end surface of the rotor core, the end portion of the accommodating slot close to the outer circle of the rotor core being provided with a magnetic bridge hole, and a magnetic flux arrangement groove being provided between the accommodating slot and the outer circle of the rotor core; and an end plate provided on the end surface of the rotor core, the end plate being annular, the outer diameter of the end plate being smaller than the outer diameter of the end surface of the rotor core, and at least part of the magnetic bridge hole and the magnetic flux arrangement groove being exposed to the end plate.

[0007] Preferably, the magnetic bridge hole and the magnetic flux arrangement groove are both exposed to the end plate.

[0008] Preferably, the end portion of the accommodating slot close to the outer circle of the rotor core is exposed to the end plate.

[0009] Preferably, the outer diameter of the end plate is D1, the outer diameter of the end surface of the rotor core is D2, and 0.45≤D1 / D2≤0.95 is satisfied.

[0010] Preferably, the magnetic bridge hole extends along the circumferential direction of the end surface of the rotor core, the width of the magnetic bridge hole along the radial direction is W1, the width of the accommodating slot is W2, and 0.4≤W1 / W2≤2 is satisfied.

[0011] Preferably, 0.8 < W1 / W2 ≤ 2.

[0012] Preferably, the length of the magnetic bridge hole extending circumferentially along the end face of the rotor core is L1, the projection of the receiving groove on the end face of the rotor core is a V shape with the opening facing the outer circle of the rotor core, and the span between the two ends of the receiving groove near the outer circle of the rotor core is L2, and satisfies: 0.03≤L1 / L2≤0.42.

[0013] Preferably, the magnetic bridge hole extends from the end of the receiving slot near the outer circle of the rotor core along the circumferential direction of the end face of the rotor core toward the adjacent receiving slot, and the adjacent magnetic bridge holes on the adjacent receiving slots are separated from each other.

[0014] Preferably, harmonic slots are formed along the axial direction on the outer circular surface of the rotor core.

[0015] Preferably, the harmonic slot is located at a position corresponding to the end of the receiving slot near the outer circle of the rotor core.

[0016] Preferably, the minimum distance between the harmonic groove and the receiving groove is 0.3mm-5mm.

[0017] Preferably, the rotor core has a rotor shaft assembly hole at its center, and one or more rotor core laminations located at at least one end of the rotor core have a large hole at their center, the diameter of which is larger than the diameter of the rotor shaft assembly hole.

[0018] This utility model also provides a compressor, including the motor rotor structure described above.

[0019] Compared with the prior art, this utility model has significant progress:

[0020] This invention utilizes magnetic bridge holes to enhance heat dissipation at easily demagnetized corners of the magnet, improving the magnet's resistance to demagnetization and increasing its remanence, thereby improving motor performance. Magnetic flux stabilization slots reduce harmonics and improve motor performance. An annular end plate is used, with its outer diameter smaller than the outer diameter of the rotor core's end face. This ensures that at least part of the magnetic bridge holes and magnetic flux stabilization slots are exposed to the compressor's refrigerant. These exposed holes and slots serve as flow passages, significantly improving heat dissipation from the rotor core and magnets, reducing magnet temperature, enhancing demagnetization resistance, and increasing remanence, thus improving motor performance. Furthermore, it increases the refrigerant flow area, reducing internal refrigerant flow resistance, minimizing eddies, reducing refrigerant flow losses, and improving compressor performance. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the motor rotor structure according to an embodiment of the present utility model.

[0022] Figure 2 is Figure 1 An end surface schematic view of the motor rotor structure after removing the balance block is shown.

[0023] Figure 3 A cross-sectional schematic view of the motor rotor structure of the embodiment of the utility model.

[0024] Figure 4 is Figure 3 A schematic view after removing the magnet in the middle.

[0025] Among them, the sign explanation is as follows:

[0026] 1 rotor core

[0027] 11 accommodating slot

[0028] 12 magnetic isolation bridge hole

[0029] 13 magnetic beam arrangement slot

[0030] 14 harmonic slot

[0031] 15 rotor shaft assembly hole

[0032] 16 large hole

[0033] 17 through-flow hole

[0034] 2 end plate

[0035] 3 magnet

[0036] 4 balance block DETAILED DESCRIPTION

[0037] The specific embodiments of the utility model will be further described in detail below in combination with the drawings. These embodiments are only used for describing the utility model, and not limit the utility model.

[0038] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, a particular orientation and operation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication。For ordinary skilled in the art, the above-mentioned terms can be understood according to the specific meaning of the utility model.

[0040] In addition, in the description of the utility model, unless otherwise stated, the meaning of "multiple" is two or more than two.

[0041] As Figures 1 to 4 The utility model provides a kind of embodiment of motor rotor structure as shown in the figure.The motor rotor structure of this embodiment includes rotor core 1 and end plate 2, in addition, the motor rotor structure of this embodiment further includes magnet 3 and balance block 4.

[0042] Among them, rotor core 1 is the cylindrical structure with the center through along axial by the lamination of multiple rotor core punching sheet, and the rotor core punching sheet is preferably silicon steel punching sheet.The inside of rotor core 1 is provided with multiple accommodating grooves 11 along axial, and the multiple accommodating grooves 11 are distributed along the circumferential direction of the end surface of rotor core 1, each accommodating groove 11 is used for embedding magnet 3, and the magnet 3 in each accommodating groove 11 forms a rotor magnetic pole.The magnetism of adjacent rotor magnetic poles is opposite, i.e., the opposite magnetism of rotor magnetic poles is alternately arranged along the circumferential direction of the end surface of rotor core 1.The end of accommodating groove 11 close to the outer circle of rotor core 1 is provided with a magnetic bridge hole 12, which can enhance the heat dissipation of the demagnetization corner of magnet 3, improve the demagnetization resistance of magnet 3, improve the remanence of magnet 3, and thus improve the motor performance.The magnetic flux arrangement groove 13 is arranged between the accommodating groove 11 and the outer circle of rotor core 1, and the magnetic flux arrangement groove 13 is arranged along the outer edge of rotor core 1, which can reduce the harmonic and improve the motor performance.

[0043] The end plate 2 is arranged on the end surface of rotor core 1, and the end plate 2 is a circular ring, and the outer circle and the inner circle of the end plate 2 are complete circles. Figure 1 And Figure 2, the outer diameter of the end plate 2 is D1, the outer diameter of the end surface of the rotor core 1 is D2, the outer diameter D1 of the end plate 2 is less than the outer diameter D2 of the end surface of the rotor core 1, and the magnetic bridge hole 12 and the magnetic flux arrangement groove 13 are at least partially exposed to the end plate 2. Thus, the magnetic bridge hole 12 and the magnetic flux arrangement groove 13 are at least partially exposed to the refrigerant of the compressor, and the exposed magnetic bridge hole 12 and the magnetic flux arrangement groove 13 are used as flow holes. On the one hand, the heat dissipation of the rotor core 1 and the magnet 3 can be greatly improved, the temperature of the magnet 3 can be reduced, the demagnetization resistance of the magnet 3 can be improved, the residual magnetism of the magnet 3 can be improved, and the performance of the motor can be improved. On the other hand, the flow area of the refrigerant can be increased, the flow resistance of the refrigerant in the compressor can be reduced, the vortex can be reduced, the flow loss of the refrigerant can be reduced, and the performance of the compressor can be improved.

[0044] In the embodiment, preferably, the ratio of the outer diameter D1 of the end plate 2 to the outer diameter D2 of the end surface of the rotor core 1 is designed to be suitable, so that the magnetic bridge hole 12 and the magnetic flux arrangement groove 13 are all exposed to the end plate 2. Thus, the magnetic bridge hole 12 and the magnetic flux arrangement groove 13 can all be used as flow holes, so that the heat dissipation effect of the rotor core 1 and the magnet 3 can be improved.

[0045] In the embodiment, preferably, the ratio of the outer diameter D1 of the end plate 2 to the outer diameter D2 of the end surface of the rotor core 1 is designed to be suitable, so that the end part of the accommodating groove 11 close to the outer circle of the rotor core 1 is exposed to the end plate 2. Thus, the heat dissipation effect of the magnet 3 can be improved.

[0046] Preferably, in the embodiment, the ratio of the outer diameter D1 of the end plate 2 to the outer diameter D2 of the end surface of the rotor core 1 satisfies: 0.45≤D1 / D2≤0.95.

[0047] Referring to Figure 4 In the embodiment, the magnetic bridge hole 12 extends along the circumferential direction of the end surface of the rotor core 1, the width of the magnetic bridge hole 12 along the radial direction is W1, and the width of the accommodating groove 11 is W2. Preferably, the ratio of the width W1 of the magnetic bridge hole 12 along the radial direction to the width W2 of the accommodating groove 11 satisfies: 0.4≤W1 / W2≤2. Further optionally, 0.8≤W1 / W2≤2.

[0048] Referring to Figure 3 and Figure 4In the embodiment, the projection of the accommodating groove 11 on the end surface of the rotor core 1 is in a V shape with an opening facing the outer circle of the rotor core 1, two magnets 3 are arranged in each V-shaped accommodating groove 11, the two magnets 3 form a V-shaped structure and constitute a V-shaped rotor pole, the magnetic properties of adjacent V-shaped rotor poles are opposite, and the adjacent V-shaped rotor poles are alternately distributed in pairs along the circumference of the end surface of the rotor core 1. The magnetic bridge hole 12 extending along the circumference of the end surface of the rotor core 1 for a long length is arranged between the adjacent V-shaped rotor poles, which can reduce the inter-pole leakage magnetic flux, increase the flow area, better improve the heat dissipation of the magnet 3, and more effectively reduce the flow resistance of the refrigerant in the compressor, reduce the vortex, reduce the flow loss of the refrigerant, and improve the performance of the compressor. A plurality of magnetic flux arrangement grooves 13 are arranged in the area between each V-shaped accommodating groove 11 and the outer circle of the rotor core 1.

[0049] Preferably, in the embodiment, the magnetic bridge hole 12 extends from the end of the accommodating groove 11 close to the outer circle of the rotor core 1 along the circumference of the end surface of the rotor core 1 to the adjacent accommodating groove 11, and the adjacent magnetic bridge holes 12 on the adjacent accommodating grooves 11 are separated from each other.

[0050] Preferably, in the embodiment, the length of the magnetic bridge hole 12 extending along the circumference of the end surface of the rotor core 1 is L1, the span between the two ends of the accommodating groove 11 close to the outer circle of the rotor core 1 is L2, and the following condition is satisfied: 0.03≤L1 / L2≤0.42.

[0051] Referring to Figure 1 Preferably, in the embodiment, the harmonic groove 14 is arranged on the outer circumferential surface of the rotor core 1 in the axial direction, and a plurality of harmonic grooves 14 can be arranged. The harmonic grooves 14 are arranged at intervals along the circumference of the outer circumferential surface of the rotor core 1. The harmonic grooves 14 can reduce harmonics and improve the performance of the motor. When the rotor rotates at high speed, the harmonic grooves 14 can be used as a stirring surface to stir the surrounding fluid and improve the heat dissipation near the stator-rotor air gap, thereby improving the performance of the motor. In addition, the harmonic grooves 14 can also increase the surface area of the rotor core 1, thereby improving the heat dissipation.

[0052] Preferably, the harmonic slot 14 on the outer circumferential surface of the rotor core 1 is arranged at a position corresponding to an end of the accommodating slot 11 close to the outer circle of the rotor core 1. In the embodiment, one harmonic slot 14 is arranged at a position corresponding to each end of the V-shaped accommodating slot 11 close to the outer circle of the rotor core 1. Arranging the harmonic slot 14 at a position corresponding to the end of the accommodating slot 11 close to the outer circle of the rotor core 1 can make the harmonic slot 14 close to the magnetic bridge hole 12, and under the premise of ensuring the structural strength, the closer the harmonic slot 14 is to the magnetic bridge hole 12, the greater the magnetic resistance between the adjacent rotor magnetic poles, that is, the magnetic bridge hole 12 is equivalent to being lengthened, thereby reducing the magnetic leakage between the adjacent rotor magnetic poles, improving the motor back electromotive force, and improving the motor performance. In the embodiment, for the V-shaped accommodating slot 11, when the harmonic slot 14 is arranged at a position corresponding to the two ends of the V-shaped accommodating slot 11 close to the outer circle of the rotor core 1, the smaller the minimum distance between the harmonic slot 14 and the accommodating slot 11, the closer the harmonic slot 14 is to the magnetic bridge hole 12 at the two ends of the accommodating slot 11. Referring to Figure 4 In the embodiment, the minimum distance between the harmonic slot 14 and the accommodating slot 11 is L3, and preferably, the value of L3 is in the range of 0.3mm-5mm.

[0053] In the embodiment, the end plate 2 is arranged on each end surface of the rotor core 1, and the balance block 4 is provided with two balance blocks 4, and the two balance blocks 4 are arranged on the two end plates 2 respectively.

[0054] In the embodiment, referring to Figure 1 The center of the rotor core 1 is provided with a rotor shaft assembly hole 15 penetrating the rotor core 1 in the axial direction and used for connecting the rotor shaft. Preferably, the center of one or more rotor core punching sheets at least at one end of the rotor core 1 is provided with a large hole 16, and the hole diameter of the large hole 16 is greater than the hole diameter of the rotor shaft assembly hole 15. In this way, the problem that the detection go-gauge cannot pass through the rotor shaft assembly hole 15 due to the slight deformation of the inner hole of the outermost rotor core punching sheet at the end of the rotor core 1 caused by process problems, and the rotor core punching sheet is scrapped, but the rotor core punching sheet can actually be used, and material waste is caused, can be avoided. By enlarging the hole diameter of the inner hole of the one or more rotor core punching sheets at the end of the rotor core 1, the above problem can be solved, and the production cost is reduced and the production efficiency is improved. Further, in the embodiment, a plurality of flow holes 17 are arranged around the rotor shaft assembly hole 15 in the rotor core 1, the hole diameter of the large hole 16 is greater than the maximum outer diameter of the circumferences of all the flow holes 17, and all the flow holes 17 are exposed to the large hole 16.

[0055] Based on the motor rotor structure of the utility model, the utility model embodiment further provides a compressor. The compressor of the embodiment comprises the motor rotor structure of the above embodiment.

[0056] The above merely is the preferred implementation form of the present application, and it should be noted that, for the ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be considered as the protection scope of the present application.

Claims

1. An electric machine rotor structure, characterized in that, The rotor core (1) is provided with a plurality of accommodating grooves (11) for embedding magnets (3) along the axial direction, the plurality of accommodating grooves (11) are distributed along the circumferential direction of the end surface of the rotor core (1), the accommodating grooves (11) are provided with a magnetic bridge hole (12) near the end of the outer circle of the rotor core (1), and the accommodating grooves (11) and the outer circle of the rotor core (1) are provided with a magnetic flux arrangement groove (13). The end plate (2) is provided on the end surface of the rotor core (1), the end plate (2) is a circular ring, the outer diameter of the end plate (2) is smaller than the outer diameter of the end surface of the rotor core (1), and at least part of the magnetic bridge hole (12) and the magnetic flux arrangement groove (13) are exposed to the end plate (2). The magnetic bridge hole (12) and the magnetic flux arrangement groove (13) are all exposed to the end plate (2).

2. The electric machine rotor structure of claim 1, wherein, The end of the accommodating groove (11) near the outer circle of the rotor core (1) is exposed to the end plate (2).

3. The electric machine rotor structure of claim 1, wherein, The outer diameter of the end plate (2) is D1, the outer diameter of the end surface of the rotor core (1) is D2, and 0.45≤D1 / D2≤0.95 is satisfied.

4. The electric machine rotor structure of claim 1, wherein, The magnetic bridge hole (12) extends along the circumferential direction of the end surface of the rotor core (1), the width of the magnetic bridge hole (12) in the radial direction is W1, and the width of the accommodating groove (11) is W2, and 0.4≤W1 / W2≤2 is satisfied.

5. The electric machine rotor structure of claim 1, wherein, 0.8<W1 / W2≤2.

6. The electric machine rotor structure of claim 5, wherein, The length of the magnetic bridge hole (12) extending along the circumferential direction of the end surface of the rotor core (1) is L1, the projection of the accommodating groove (11) on the end surface of the rotor core (1) is in a V shape with an opening facing the outer circle of the rotor core (1), the span between the two ends of the accommodating groove (11) near the outer circle of the rotor core (1) is L2, and 0.03≤L1 / L2≤0.42 is satisfied.

7. The electric machine rotor structure of claim 1, wherein, The magnetic bridge hole (12) extends from the end of the accommodating groove (11) near the outer circle of the rotor core (1) along the circumferential direction of the end surface of the rotor core (1) to the adjacent accommodating groove (11), and the adjacent magnetic bridge holes (12) on the adjacent accommodating grooves (11) are separated from each other.

8. The electric machine rotor structure of claim 1, wherein, The harmonic groove (14) is provided on the outer circle surface of the rotor core (1) along the axial direction.

9. The electric machine rotor structure of claim 1, wherein, The harmonic groove (14) is provided at a position corresponding to the end of the accommodating groove (11) near the outer circle of the rotor core (1).

10. The electric machine rotor structure of claim 9, wherein, The minimum distance between the harmonic groove (14) and the accommodating groove (11) is 0.3mm-5mm.

11. The electric machine rotor structure of claim 10, wherein, The rotor core (1) is provided with a rotor shaft assembly hole (15) in the center, and a large hole (16) is provided in the center of one or more rotor core punching sheets on at least one end of the rotor core (1), and the hole diameter of the large hole (16) is larger than the hole diameter of the rotor shaft assembly hole (15).

12. The electric machine rotor structure of claim 1, wherein, The motor rotor structure comprises the motor rotor structure according to any one of claims 1 to 12.

13. A compressor characterized by, ​

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