Assembled and formed punching sheet, iron core and permanent magnet motor

Abstract

The utility model discloses an assembled and formed punching sheet, comprising a punching sheet tooth part which comprises a ring body and a plurality of tooth parts arranged along the circumferential direction of the ring body, the tooth parts comprise a first tooth body and a second tooth body, and the root part of the second tooth body is provided with a gap; the yoke part is used for pressing the punching sheet tooth part; the inner wall of the yoke part is provided with a protruding part corresponding to the gap in position. The utility model also discloses an iron core and a permanent magnet motor. Compared with the prior art, the problem that the existing iron core splicing design cannot be adopted to improve the performance of the motor due to insufficient width of the yoke part of the iron core of the micro motor is solved.

Description

Technical Field

[0001] This utility model relates to the field of permanent magnet motor technology, and in particular to an assembled lamination, iron core, and permanent magnet motor. Background Technology

[0002] There are many types of motors, such as series-pole motors, AC permanent magnet motors, and DC brushless permanent magnet motors. In AC permanent magnet motors and DC brushless permanent magnet motors, the coil is fixed in place, usually wound or fixed to the iron core. The coil and iron core together are usually called the stator. The iron core is then fixed to the housing, or the iron core itself can be used as part of the housing for painting. Typically, the housing has end caps at both ends, with bearing chambers on the end caps to hold bearings, and the shaft is placed in the bearing's inner hole. The iron core is usually made by stamping silicon steel sheets into the required shape (usually called laminations) and stacking them. There is an opening in the inner diameter of the iron core, through which copper wire is wound into slots.

[0003] To increase the winding volume of the iron core, a composite iron core structure can be adopted. For example, Chinese Patent 201610499042.3 discloses a stator lamination for a permanent magnet motor, including a stator lamination tooth portion and a stator lamination yoke portion. The outer edge of the annular stator lamination tooth portion has a tooth groove, the groove opening facing away from the axis of the stator lamination tooth portion, while the inner edge of the stator lamination tooth portion is a continuous circular surface. The stator lamination yoke portion can be fitted onto the outer edge of the stator lamination tooth portion to form the entire stator lamination.

[0004] In Chinese patent 201610499042.3, the iron core is divided into a yoke and teeth. The yoke is slotted, and the teeth are extended radially, with the extended portion's shape and dimensions corresponding to the slots on the yoke. After the wire is wound, the toothed portion is press-fitted into the yoke. This design is suitable for larger motors where the yoke has sufficient width for slotting. For micro-motors, the yoke width is only one or two millimeters or even narrower, making yoke slotting impossible and thus the above design cannot be used to improve motor performance. Utility Model Content

[0005] The purpose of this utility model is to provide an assembled lamination, iron core, and permanent magnet motor to solve the problem that the insufficient width of the yoke of the iron core in micro motors prevents the use of existing iron core splicing designs to improve motor performance.

[0006] To achieve the above objectives, on the one hand, this utility model provides an assembled stamping sheet, comprising:

[0007] The stamping tooth portion includes a ring body and a plurality of teeth arranged circumferentially along the ring body;

[0008] The yoke is used for pressing the teeth of the punch;

[0009] In this case, the toothed part of the lamination is separated from the yoke.

[0010] As a further description of the above technical solution:

[0011] The ring between two adjacent teeth is broken, and the teeth are fixed together with the yoke after being wound with thread.

[0012] As a further description of the above technical solution:

[0013] The toothed part includes a first tooth body and a second tooth body. The root of the second tooth body is provided with a notch, and the inner wall of the yoke is provided with a protrusion corresponding to the notch.

[0014] As a further description of the above technical solution:

[0015] The cross-section of the notch is V-shaped, U-shaped, or semi-circular.

[0016] As a further description of the above technical solution:

[0017] The first tooth and the second tooth are arranged alternately.

[0018] As a further description of the above technical solution:

[0019] The ring body is provided with three second teeth arranged circumferentially at equal intervals.

[0020] As a further description of the above technical solution:

[0021] There are three first teeth between two adjacent second teeth.

[0022] On the other hand, this utility model also provides an iron core, including the laminations as described above, wherein a plurality of laminations are stacked to form an iron core.

[0023] In addition, this utility model also provides a permanent magnet motor, including the iron core as described above.

[0024] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0025] 1. In this invention, the inner diameter of the lamination teeth is closed but not open, breaking at the root of the teeth to form a bottom slot for winding. The yoke maintains a basically round structure. After the lamination teeth are stacked, the copper wire is wound into the slot from the top slot, or the coil is pre-wound and then inserted into the slot. A notch is provided at the end of the second tooth on the lamination teeth, and a corresponding protrusion is provided on the inner wall of the yoke to achieve the positioning and matching of the laminations. Although the closed inner diameter without slots will result in a small loss of magnetic flux, it can greatly increase the volume of the winding on the iron core, or in other words, increase the slot fill factor, thereby improving the motor performance.

[0026] 2. In this utility model, the cross-section of the notch is preferably "V" shaped, and the cross-section of the protruding part matches the notch, which fully ensures the positioning effect of the yoke on the punch and facilitates the insertion of the punch into the yoke. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a second method for assembling and forming laminations to create an iron core.

[0029] Figure 2 This is a structural schematic diagram of a second assembly-formed stamping scheme.

[0030] Figure 3 This is a structural breakdown diagram of a second assembly-formed stamping scheme.

[0031] Figure 4 This is a schematic diagram of the toothed part of a stamping in a second assembly-formed stamping scheme.

[0032] Figure 5 This is a structural schematic diagram of one assembly-formed stamping scheme.

[0033] Figure 6 This is a structural schematic diagram of a third assembly-formed stamping scheme.

[0034] Figure 7 This is a structural schematic diagram of a fourth assembly-formed stamping scheme.

[0035] Legend:

[0036] 1. Stamping teeth; 11. Ring body; 12. Teeth; 121. Notch; 2. Yoke; 21. Protrusion. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0038] Example 1

[0039] Please see Figure 5 This utility model provides a technical solution: an assembled stamping sheet, comprising:

[0040] The lamination tooth 1 includes a ring body 11 and a plurality of teeth 12 arranged circumferentially along the ring body 11;

[0041] Yoke 2, which is used to press-fit the toothed part 1 of the punch;

[0042] In this case, the toothed part of the lamination is separated from the yoke.

[0043] Example 2

[0044] Please see Figure 1-4 This utility model provides a technical solution: an assembled stamping sheet, comprising:

[0045] The lamination tooth 1 includes a ring body 11 and a plurality of teeth 12 arranged circumferentially along the ring body 11;

[0046] Yoke 2, which is used to press-fit the toothed part 1 of the punch;

[0047] In this case, the toothed part of the lamination is separated from the yoke.

[0048] The toothed portion 12 includes a first tooth body and a second tooth body. A notch 121 is provided at the root of the second tooth body, and a protrusion 21 corresponding to the notch 121 is provided on the inner wall of the yoke portion 2. The first tooth body and the second tooth body are arranged at intervals to further ensure the positioning effect of the yoke portion 2 on the lamination toothed portion 1.

[0049] On the other hand, this utility model also provides an iron core, including the laminations as described above, wherein a plurality of laminations are stacked to form an iron core.

[0050] In addition, this utility model discloses a permanent magnet motor including the iron core as described above.

[0051] Working principle: The inner diameter of the lamination tooth 1 is closed but not open, breaking at the root of the tooth to form a bottom slot for winding. The yoke 2 maintains a basically round structure. After the lamination teeth 1 are stacked, the copper wire is wound into the slot from the top slot, or the coil is pre-wound and then inserted into the slot. A notch is provided at the end of the second tooth on the lamination tooth 1, and a corresponding protrusion is provided on the inner wall of the yoke 2 to achieve positioning and matching of the lamination teeth 1. Although the closed inner diameter without slots will result in a small loss of magnetic flux, it can greatly increase the volume of the winding on the iron core, or in other words, increase the slot fill factor (the ratio of the total cross-sectional area of ​​the copper wire in a slot to the cross-sectional area of ​​the slot), thereby improving the motor performance.

[0052] The width of the tooth 12 on the lamination tooth 1 is greater than the width of the yoke 2. Since the magnetic flux through the tooth to the yoke is split on both sides, the width of the tooth 12 is at least twice the minimum width of the yoke 2.

[0053] Example 3

[0054] This embodiment further improves upon the above embodiment by providing the following technical solution: the cross-section of the notch 121 is "V"-shaped, "U"-shaped, or semi-circular. As shown in the attached figure, a "V"-shaped notch is preferred.

[0055] The cross-section of the protrusion 21 matches the notch 121, which fully ensures the positioning effect of the yoke 2 on the lamination tooth 1, and at the same time facilitates the insertion of the lamination tooth 1 into the yoke 2.

[0056] Example 4

[0057] Based on the above embodiments, this embodiment further improves upon the following technical solution: three circumferentially equidistant second teeth are provided on the ring body 11, and three first teeth are provided between two adjacent second teeth, effectively positioning a single lamination tooth 1 and effectively ensuring the volume of the winding on the iron core.

[0058] Example 5

[0059] Based on the above embodiments, this embodiment further improves the following technical solution: the tooth has a trapezoidal structure, and the width of the contact between the tooth 12 and the yoke 2 is greater than the width of the contact between the tooth 12 and the ring 11, so as to improve the winding quality with an iron core.

[0060] Example 6

[0061] Based on Embodiment 1 above, this embodiment further incorporates the following improved technical solutions: (See Appendix) Figure 6 The ring 11 between two adjacent teeth 12 is disconnected, and the teeth are fixed together with the yoke after being wound. Disconnecting the ring reduces the loss of magnetic flux shunting and further improves motor performance.

[0062] When assembling the iron core using this type of lamination, each of the separately wound teeth 12 needs to be fixed to the yoke 2 with an epoxy or similar potting compound.

[0063] Example 7

[0064] Based on Embodiment 2 above, this embodiment further incorporates the following improved technical solutions: (See Appendix) Figure 7 The ring 11 between two adjacent teeth 12 is broken, and the teeth 12 are bonded and fixed to the yoke.

[0065] When assembling the iron core using this type of lamination, each of the separately wound teeth 12 needs to be fixed to the yoke 2 with an epoxy or similar potting compound.

[0066] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A press formed blank for assembly, characterized in that, The application relates to a core and a core made of the same. The core comprises: a punching sheet tooth part comprising a ring body and a plurality of tooth parts arranged circumferentially along the ring body; a yoke part used for press-fitting the punching sheet tooth part; wherein the punching sheet tooth part is separated from the yoke part; the ring body between two adjacent tooth parts is disconnected, and the tooth parts are fixed together with the yoke part after being wound into a coil; 2. A press formed blank of claim 1, wherein the tooth part comprises a first tooth body and a second tooth body, the root of the second tooth body is provided with a notch, and the inner wall of the yoke part is provided with a protruding part corresponding to the notch in position.

3. A press formed blank of claim 1 wherein, The cross section of the notch is in the shape of a "V", a "U" or a semicircle.

4. A press formed blank of claim 3, wherein The first tooth body and the second tooth body are arranged at intervals.

5. A press formed blank of claim 4, wherein Three second tooth bodies are arranged at equal intervals on the ring body in the circumferential direction.

6. A press formed blank of claim 1 wherein, Three first tooth bodies are arranged between two adjacent second tooth bodies.

7. An iron core characterized by The tooth part is in a trapezoidal structure, and the width of the tooth part at the position in contact with the yoke part is greater than the width of the tooth part at the position in contact with the ring body.

8. A permanent magnet electric machine characterized by, The application further relates to a core comprising a plurality of the punching sheets as claimed in any one of claims 1-6. The application further relates to a core comprising the core as claimed in claim 7.

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