High efficiency motor inner winding lamination

Abstract

The utility model discloses an inner winding lamination of high -efficient motor, including the lamination body of basically square, the middle part of lamination body forms the hollow inner circle hole, the hollow inner circle hole periphery direction is provided with a plurality of lamination grooves extending along the radial on lamination body interval, and the lamination groove between two two forms tooth part and yoke on lamination body, the lamination groove has the slot mouth, the shoulder and the groove bottom, wherein the slot mouth is rectangle setting, the groove bottom of slot mouth both ends with its adjacent tooth part is 90 set, and two groups of groove bottom intersection position is provided with arc part, and the radius Rk of arc part is 12.5mm. The utility model proposes technical scheme, and the winding of stator is optimized to the inner winding type scheme from the original winding, embedding wire, shaping etc. multiple processes, can improve product quality, production efficiency, reduce cost under the condition of satisfying motor performance.

Description

Technical Field

[0001] This utility model belongs to the field of stator lamination technology, specifically an inner winding lamination for a high-efficiency electric motor. Background Technology

[0002] An electric motor is a device that converts electrical energy into mechanical energy. It mainly consists of a stator winding, a rotor, and bearings that support its rotation. The stator winding is composed of copper wire coils and stator laminations with multiple slots.

[0003] The current fan motor market is facing intensified competition due to product homogeneity, and downstream customers' continuously increasing demands for cost control and energy efficiency are forcing innovation in motor design. Traditional fan motors generally adopt a stator structure with 16 or more slots of distributed windings, which has the following technical defects:

[0004] 1. High material costs: Distributed windings require multiple layers of winding, increasing the amount of enameled wire used and adding end redundancy (typically accounting for 20%-30% of the total winding). The cost of copper / aluminum consumables remains high. Furthermore, to meet magnetic circuit performance requirements, a larger yoke height is needed, resulting in low utilization of silicon steel sheets.

[0005] 2. Energy efficiency bottleneck: The excessive length of the winding ends leads to increased copper losses, which restricts the breakthrough of efficiency. Moreover, the multi-slot structure is prone to tooth harmonics, which increases the core eddy current loss and noise.

[0006] 3. High process complexity: Traditional wire embedding process requires multiple steps such as winding, embedding, and shaping, which is highly dependent on manual labor and easily damages the insulation layer.

[0007] In view of the above-mentioned technical defects, an inner winding lamination for a high-efficiency electric motor is proposed. Utility Model Content

[0008] The purpose of this utility model is to provide an inner winding lamination for a high-efficiency electric motor in order to solve the problems mentioned above.

[0009] The technical solution adopted by this utility model is as follows: an inner lamination for a high-efficiency electric motor, comprising a lamination body that is basically square, a hollow inner circular hole formed in the middle of the lamination body, and a plurality of radially extending lamination slots arranged at intervals on the outer periphery of the hollow inner circular hole on the lamination body, with teeth and yokes formed between each pair of lamination slots on the lamination body, the lamination slot having a slot opening, a slot shoulder, and a slot bottom, wherein the slot opening is rectangular, the slot bottoms at both ends of the slot opening are set at 90° with the adjacent teeth, an arc portion is provided at the intersection of the two sets of slot bottoms, the radius Rk of the arc portion is 12.5mm, the two sides of the teeth are arranged parallel to each other, the width j of the teeth is 7.6mm, the width g of the slot opening is 2.0mm, the height h is 0.8mm, and the height i of the yoke is 5.4mm.

[0010] In a preferred embodiment, the number of lamination slots is eight.

[0011] In a preferred embodiment, the length a of the lamination body is 75mm to 78mm, the width b is 75mm to 78mm, and the diameter Φc of the hollow inner circular hole is 48mm.

[0012] In a preferred embodiment, mounting holes are equidistantly distributed at the four corners of the lamination body. The diameter Φd of the mounting holes is 5.5 to 6.5 mm, and the hole distance Φf between two relative mounting holes is 88 mm to 92 mm.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0014] 1. In this utility model, the number of slots of the stator lamination is redesigned from 16 slots to 8 slots, and the formation of the stator winding is optimized from the original multiple processes such as winding, embedding, and shaping to an internal winding scheme. While meeting the motor performance requirements, this can improve product quality, production efficiency, and reduce costs.

[0015] 2. In this utility model, the stator process is optimized from the winding and matching process to the straight (inner) winding process using a frame, which greatly reduces the end height, reduces the end copper loss, and improves the motor efficiency.

[0016] 3. In this utility model, the two ends of the tooth are made of parallel surfaces, which can improve the utilization rate of the stator slot area, reduce the leakage flux coefficient and temperature rise of the motor, improve the service life of the motor, and also make the magnetic field distribution more reasonable. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a preferred embodiment of the inner winding lamination of this utility model;

[0018] Figure 2 for Figure 1 A simplified diagram of the enlarged structure at point A.

[0019] The markings in the diagram are: 1-Stamp body, 2-Mounting hole, 3-Stamp groove, 4-Groove opening, 5-Tooth, 6-Hollow inner hole, 7-Yoke, 8-Groove bottom, 9-Circular arc, 10-Groove shoulder. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] Reference Figure 1-2 An inner lamination for a high-efficiency electric motor includes a lamination body 1 that is basically square. A hollow inner circular hole 6 is formed in the center of the lamination body 1. A plurality of lamination slots 3 extending radially are arranged at intervals on the outer periphery of the hollow inner circular hole 6 on the lamination body 1. The number of lamination slots 3 is preferably 8. Between each pair of lamination slots 3, a tooth 5 and a yoke 7 are formed on the lamination body 1. The lamination slot 3 has a slot opening 4, a slot shoulder 10, and a slot bottom 8. The slot opening 4 is rectangular. The slot bottoms 8 at both ends of the slot opening 4 are set at 90° with the adjacent tooth 5. An arc portion 9 is provided at the intersection of two sets of slot bottoms 8. The radius Rk of the arc portion 9 is 12.5 mm. The width g of the slot opening 4 is 2.0 mm, and the height h is... The height i of the yoke 7 is 5.4mm, and the number of slots of the stator lamination has been redesigned from 16 slots to 8 slots. The original multiple processes such as winding, embedding, and shaping have been optimized into an internal winding scheme. During assembly, the coil can be directly embedded in the lamination slot 3. With the internal winding scheme, on the one hand, the lamination body 1 can be designed as a square structure, which can further reduce the height (thickness) of the yoke 7, thereby reducing the end copper loss and improving the motor efficiency. On the other hand, the assembled coil can be embedded in the lamination slot 3 to achieve assembly, which can improve the overall assembly efficiency and reduce the loss of copper or aluminum used in the winding during motor manufacturing, thereby reducing the amount of raw materials used in the winding and core.

[0024] It should be noted that each corner of the lamination groove 3 is provided with an arc-shaped transition surface, which can reduce wear on the wires.

[0025] In this embodiment, please refer to Figure 2 As shown, the two sides of the tooth 5 are arranged parallel to each other. The width j of the tooth 5 is 7.6mm. The parallel surfaces at both ends of the tooth can ensure the consistency of the width of the lamination groove 3 in the front and rear directions of the tooth, which can improve the utilization rate of the stator slot area, reduce the leakage magnetic coefficient and temperature rise of the motor, improve the service life of the motor, and also make the magnetic field distribution more reasonable.

[0026] In this embodiment, the length a of the lamination body 1 is 75mm to 78mm, the width b is 75mm to 78mm, and the diameter Φc of the hollow inner circular hole 6 is 48mm.

[0027] In this embodiment, please refer to Figure 1 As shown, mounting holes 2 are evenly spaced at the four corners of the lamination body 1. The diameter of the mounting holes 2 is Φd, which is 5.5 to 6.5 mm, and the distance between two mounting holes 2 is Φf, which is 88 mm to 92 mm. During the process of stacking a large number of laminations into an iron core, the mounting holes 2 at the four corners can be used with guide pins or positioning rods to achieve precise positioning. When stacking laminations, it can ensure that all laminations are aligned in the stacking direction.

[0028] In summary, by changing the shape and number of slots in the lamination slot 3, the magnetic field distribution in the slot shoulder and yoke is made more reasonable, which can also improve the assembly efficiency of the motor and reduce the overall production cost.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An inner winding lamination for a high-efficiency electric motor, characterized in that, The device includes a basically square stamped body with a hollow inner circular hole in the center. A plurality of radially extending stamped grooves are spaced apart on the outer periphery of the hollow inner circular hole. Between each pair of stamped grooves, a toothed portion and a yoke are formed on the stamped body. Each stamped groove has a groove opening, a groove shoulder, and a groove bottom. The groove opening is rectangular, and the groove bottoms at both ends of the groove opening are at a 90° angle to the adjacent toothed portion. An arc portion with a radius Rk of 12.5 mm is provided at the intersection of two sets of groove bottoms. The two sides of the toothed portion are parallel to each other, and the width j of the toothed portion is 7.6 mm. The width g of the groove opening is 2.0 mm, the height h is 0.8 mm, and the height i of the yoke is 5.4 mm.

2. The inner lamination of the high-efficiency electric motor as described in claim 1, characterized in that: The number of stamping slots is 8.

3. The inner lamination of the high-efficiency electric motor as described in claim 2, characterized in that: The length a of the stamped body is 75mm to 78mm, the width b is 75mm to 78mm, and the diameter Φc of the hollow inner circular hole is 48mm.

4. The inner lamination of the high-efficiency electric motor as described in claim 3, characterized in that: The lamination body has mounting holes evenly spaced at its four corners. The diameter of each mounting hole Φd is 5.5 to 6.5 mm, and the distance between two mounting holes Φf is 88 mm to 92 mm.

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