Combined stator punching sheet and motor

Abstract

The utility model discloses a combined type stator punching sheet and a motor. The combined type stator punching sheet comprises a stator yoke ring and a stator tooth ring. An inner cavity is formed in the middle of the stator yoke ring; the stator tooth ring is arranged in the inner cavity; wherein the stator yoke ring and the stator tooth ring are connected and jointly form a plurality of closed slots which are annularly distributed, and the closed slots are used for accommodating winding coils. According to the utility model, the stator is designed into the yoke ring and the toothed ring in a split manner, the yoke ring and the toothed ring are combined through the common connecting edge and the buckle structure, the overall structural strength is good, the process is simple to realize, and the pre-wound coil framework assembly can be sleeved between the tooth parts on the stator toothed ring before the yoke ring and the toothed ring are combined, so that the high slot fullness rate can be realized; this increases the power density of the electric machine.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a combined stator punching sheet and a motor. Background Art

[0002] In recent years, with the increasing demand for large-scale production and energy-saving awareness, the fractional-slot concentrated winding structure has been widely used in the field of small-power brushless DC motors.

[0003] The motor structure scheme using fractional slot concentrated winding can effectively save the use of electromagnetic wire, thereby improving motor efficiency and reducing manufacturing costs. This structure has good application prospects in industries such as home appliances, transmissions, fans, and water pumps.

[0004] However, most stator structures that use this type of winding currently use open slots. This is because the stator punching structure of the open slot is simple and can be stamped in one step by a composite mold. And because the tooth part and the yoke part are integrated, the tooth part strength is high, the natural frequency of the motor stator core is high, the deformation is small during operation, and the electromagnetic vibration can be controlled within an ideal range.

[0005] However, open slot concentrated winding stators also have obvious defects. For example, since the wire nozzle needs to extend from the slot during winding, the stator slot fill rate cannot be too high. A low slot fill rate will lead to a decrease in the motor power density. In addition, the presence of the slot increases the cogging effect of the motor, resulting in a large cogging torque in the permanent magnet motor, generating torque pulsation, and thus increasing the vibration and noise of the motor.

[0006] Therefore, how to design and develop a stator punching sheet with high slot fill rate and no cogging effect is a problem that needs to be solved. Utility Model Content

[0007] The main purpose of the utility model is to provide a combined stator punching sheet and a motor, which are used to solve the problem of low slot fill rate of the existing open slot concentrated winding stator, and further solve the defects of motor vibration and noise caused by the cogging effect.

[0008] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0009] A combined stator punching sheet comprises a stator yoke ring and a stator gear ring;

[0010] An inner cavity is provided in the middle of the stator yoke ring, and the stator gear ring is arranged in the inner cavity;

[0011] The stator yoke ring and the stator tooth ring are connected and together form a plurality of closed slots distributed in a ring shape, and the closed slots are used to accommodate winding coils.

[0012] Among them, a plurality of clamping grooves are arranged on the inner cavity wall of the stator yoke ring, and a clamping portion corresponding to the number of the clamping grooves is arranged on the stator gear ring, and the clamping portion is clamped in the clamping grooves.

[0013] Wherein, the stator gear ring has a plurality of tooth portions, and each of the tooth portions is provided with a clamping portion.

[0014] Wherein, the cross section of the inner cavity is an equilateral polygon, and a slot is provided on each side of the equilateral polygon.

[0015] Wherein, the card slot is a circular slot with an opening.

[0016] Wherein, the opening corner of the circular groove is an arc-shaped transition structure.

[0017] Wherein, the clamping portion is a circular piece extending from the end of the tooth portion, and the connection between the circular piece and the tooth portion is an arc-shaped transition structure.

[0018] A winding groove is provided between two adjacent teeth along the circumferential direction of the stator tooth ring, the bottom wall cross section of the winding groove is a V-shaped structure, and the middle part of the V-shaped structure is a straight line segment.

[0019] Wherein, a through hole is provided in the middle of the stator gear ring, and the thinnest part formed by the straight line segment and the hole wall of the through hole is 0.3 mm to 3 mm.

[0020] A motor comprises the above-mentioned combined stator punching sheets.

[0021] Beneficial technical effects of the utility model:

[0022] The utility model designs the stator into two parts, a yoke ring and a gear ring. Before the stator yoke ring and the stator gear ring are combined, the pre-wound coil belt skeleton component can be inserted between the teeth on the stator gear ring, so as to achieve a high slot fill rate, which improves the power density of the motor. In addition, since there is no notch between the tooth tips as a whole formed by the combined stator yoke ring and the stator gear ring, that is, the stator is in a closed slot shape, so that the cogging effect of the motor can be eliminated, the motor cogging torque is low, the torque pulsation is small, and the vibration noise of the motor and the performance of servo applications are optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional schematic diagram of a combined stator punching sheet according to an embodiment of the utility model;

[0024] Figure 2 It is a schematic cross-sectional view of a stator yoke ring of a combined stator punching sheet according to an embodiment of the utility model;

[0025] Figure 3It is a cross-sectional schematic diagram of a stator gear ring of a combined stator punching sheet according to an embodiment of the utility model;

[0026] Figure 4 This is a schematic structural diagram of a portion of the combined stator punching sheet of the embodiment of the utility model after the coil is wound;

[0027] Figure 5 for Figure 3 Schematic diagram of the partially enlarged structure.

[0028] Description of reference numerals:

[0029] 1- stator yoke ring, 101-inner cavity of stator yoke ring, 2-stator tooth ring, 200-through hole, 201-tooth portion of stator tooth ring, 3-slot, 301-arc-shaped transition portion of the slot, 4-clamping portion, 401-arc-shaped transition portion of the clamping portion, 5-straight segment, 6-tooth tip, 7-coil with skeleton assembly. DETAILED DESCRIPTION

[0030] In order to make the technical solution of the present invention more clear and specific to those skilled in the art, the present invention is further described in detail below in conjunction with embodiments and drawings, but the implementation methods of the present invention are not limited thereto.

[0031] like Figure 1-Figure 5 As shown, the combined stator punching sheet provided in this embodiment includes a circular stator yoke ring 1 and a spoke-shaped stator gear ring 2;

[0032] An inner cavity 101 having an equilateral polygonal cross section is provided in the middle of the stator yoke ring 1, which is used to connect with the tooth portion 201 of the stator gear ring 2. The plurality of tooth portions 201 are equidistantly spaced along the outer circumference of the stator gear ring 2. The number of the tooth portions 201 of the stator gear ring 2 is equal to the number of sides of the inner cavity 101 of the stator yoke ring 1. The number of the tooth portions 201 of the stator gear ring 2 is an integer multiple of 3. In this embodiment, as shown in the attached Figure 1 As shown, the stator gear ring 2 of the combined stator punching sheet has 12 teeth 201. In other embodiments, the number of teeth 201 can be increased or decreased according to actual needs, as long as the number of teeth is a multiple of 3.

[0033] A slot 3 is provided at the middle of each side of the inner cavity 101 of the stator yoke ring 1. The slot 3 is a circular slot with an opening. Figure 2 As shown, the circular groove with an opening is shaped like a "match head". For the circular groove with an opening, the opening diameter is smaller than the inner diameter of the circular groove.

[0034] A clamping portion 4 is provided at the middle of each tooth portion 201 of the stator gear ring 2 . The clamping portion 4 is a circular piece extending from the end of the tooth portion 201 . The outer contour of the clamping portion 4 is substantially the same as the inner contour of the clamping slot 3 .

[0035] like Figure 3 As shown, the clamping portion 4 is also shaped like a "match head". When the clamping portion 4 is clamped in the clamping slot 3 at the corresponding position, the stator yoke ring 1 and the stator gear ring 2 are fixedly connected, and at the same time, a plurality of closed slots distributed in a ring shape are formed, and the closed slots are used to accommodate the winding coils.

[0036] In this embodiment, the opening cross section of the card slot 3 can be regarded as a rectangular channel as a whole, but it is not a complete rectangle because its corners are arc-shaped transition structures, such as Figure 2 The arc-shaped transition portion 301 of the slot is shown.

[0037] The connection between the tooth portion 201 and the clamping portion 4 is an arc-shaped transition structure, such as Figure 3 The arc-shaped transition portion 401 of the clamping portion is shown.

[0038] The arcuate transition portion 301 of the slot and the arcuate transition portion 401 of the clamping portion are adjacently distributed when the stator yoke ring 1 and the stator gear ring 2 are connected to each other, and the two adjacent transition portions can fit each other, which can reduce the stress concentration of the punching sheet and improve the strength of the punching sheet.

[0039] In addition, the unique shape of the above-mentioned slot 3 means that it has a larger contact area, and the cooperation with the clamping portion 4 with a similar contour provides a reliable interlocking mechanism with a strong fixing effect. After the stator yoke ring 1 and the stator gear ring 2 are connected, the cooperation between the slot 3 and the clamping portion 4 effectively enhances the connection strength between the two parts, which means that the overall structure of the stator becomes more stable and rigid. This increased structural rigidity can increase the modal natural frequency of the stator assembly, so that the motor has less vibration and lower noise when approaching or reaching its operating frequency.

[0040] In this embodiment, if Figure 3 As shown, a through hole 200 is provided in the middle of the stator gear ring 2, and a winding groove is provided between two adjacent tooth portions 201 along the circumferential direction of the stator gear ring 2. The bottom wall cross-section of the winding groove is a V-shaped structure, and the middle part of the V-shaped structure is a straight line segment 5, that is, the transition part between the tooth tips 6 of the two adjacent tooth portions 201 is a straight line segment 5.

[0041] The thinnest part of the stator punching sheet is formed between the straight segment 5 and the wall of the through hole 200 of the stator gear ring 2. The size of the thinnest part is any value between 0.3mm and 3mm. The thinner the part is, the smaller the leakage magnetic flux between two adjacent teeth will be, which is beneficial to reducing the stray loss of the motor. However, the thinner it is, the more it will affect the life of the die and the structural strength of the stator. Therefore, the thinnest part is selected with a suitable thickness according to the size of the actual product, that is, a reasonable choice is made within the range of 0.3-3mm. The straight segment 5 between two adjacent teeth 201 can reduce the structural stress of the stator gear ring 2. At the same time, on the stator gear ring, the magnetic lines of force are usually distributed along the teeth and the grooves between the two teeth. If the transition of the middle part of the tooth tip is a straight line, this can provide a more uniform and direct path, reduce the distortion of the magnetic lines of force in the transition area, and thus reduce the stator stray loss.

[0042] In this embodiment, before the stator yoke ring 1 and the stator tooth ring 2 are combined, the pre-wound coil belt skeleton assembly 7 can be inserted between the teeth 201 of the stator tooth ring 2, and a high slot fill rate of more than 80% can be achieved, which can improve the power density of the motor. After the stator yoke ring 1 and the stator tooth ring 2 are combined through the snap-on structure, the whole formed has no notches between the teeth 201, that is, the stator assembly becomes a closed slot shape, which can eliminate the tooth slot effect of the motor, and the motor tooth slot torque is low, the torque pulsation is small, and the vibration noise of the motor and the performance of servo applications are optimized.

[0043] In this embodiment, the card slot 3 and the card connection portion 4 are not limited to the shapes mentioned above, and other shapes such as rectangles that can achieve or approach the technical effects of the shapes mentioned above in this embodiment can also be used as substitutes.

[0044] A motor is a permanent magnet motor, which comprises the above-mentioned combined stator punching sheet. The stator punching sheet of the permanent magnet motor has the advantages of high structural strength, high slot fill rate and no cogging effect.

[0045] To sum up, in this embodiment, the stator yoke ring 1 and the stator gear ring 2 provided in this embodiment are combined through a common connecting edge and a snap-fit ​​structure, the overall structural strength is good, the process is simple to implement, and the modal natural frequency of the stator assembly is improved.

[0046] In addition, the arc-shaped transition parts of the clamping portion 4 and the clamping groove 3 respectively help to distribute stress more evenly, thereby reducing local stress concentration. When combined, they can reduce the stress concentration of the combined stator punching sheet, which is beneficial to improving the overall structural strength and durability.

[0047] Finally, the bottom wall of the upper tooth tip of the stator gear ring 2 is a straight line transition, which can reduce the structural stress of the stator gear ring 2. At the same time, the straight line transition can provide a more uniform and direct path, which can reduce the distortion of magnetic lines of force and reduce the stator stray loss, effectively improving the overall efficiency and performance of the motor.

[0048] The above is only a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the present invention according to the technical solution and concept of the present invention, which fall within the protection scope of the present invention.

Claims

1. A combined stator punching sheet, characterized in that: It comprises a stator yoke ring (1) and a stator gear ring (2); An inner cavity is provided in the middle of the stator yoke ring (1), and the stator gear ring (2) is arranged in the inner cavity; The stator yoke ring (1) and the stator tooth ring (2) are connected and together form a plurality of closed slots distributed in an annular shape, wherein the closed slots are used to accommodate winding coils.

2. The combined stator sheet according to claim 1, characterized in that: A plurality of clamping grooves (3) are provided on the inner cavity wall of the stator yoke ring (1), and a number of clamping parts (4) corresponding to the number of the clamping grooves (3) are provided on the stator gear ring (2), and the clamping parts (4) are clamped in the clamping grooves (3).

3. The combined stator sheet according to claim 2, characterized in that: The stator gear ring (2) has a plurality of tooth portions, and each of the tooth portions is provided with a clamping portion (4).

4. The combined stator sheet according to claim 3, characterized in that: The cross section of the inner cavity is an equilateral polygon, and a clamping slot (3) is provided on each side of the equilateral polygon.

5. The combined stator sheet according to claim 4, characterized in that: The clamping slot (3) is a circular slot with an opening.

6. The combined stator sheet according to claim 5, characterized in that: The opening corner of the circular groove is an arc-shaped transition structure.

7. The combined stator sheet according to claim 6, characterized in that: The clamping portion (4) is a circular piece extending from the end of the tooth portion, and the connection between the circular piece and the tooth portion is an arc-shaped transition structure.

8. The combined stator sheet according to claim 3, characterized in that: A winding groove is provided between two adjacent tooth portions along the circumferential direction of the stator tooth ring (2); the bottom wall cross section of the winding groove is a V-shaped structure, and the middle portion of the V-shaped structure is a straight line segment.

9. The combined stator sheet according to claim 8, characterized in that: A through hole is provided in the middle of the stator gear ring (2), and the thinnest part formed by the straight line segment and the hole wall of the through hole is 0.3 mm to 3 mm.

10. A motor, characterized in that: The motor comprises a combined stator lamination as claimed in any one of claims 1 to 9.

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