ELECTRIC MOTOR STATOR PUNCHING SHEET AND ELECTRIC MOTOR THAT USES IT.

Abstract

An electric motor stator punching sheet and an electric motor using the same are described. A central hole is provided in the middle portion of the stator punching sheet. The stator punching sheet comprises an annular yoke portion and stator tooth portions, and a wire-inlay slot is formed between two adjacent stator tooth portions. The stator tooth portion comprises a tooth root portion and a pole shoe portion positioned at the end of the tooth root portion. The diameter D1 of an outer circle of the stator punching sheet varies from 61.75 mm to 68.25 mm, and the inner diameter D2 of the central hole varies from 31.6 mm to 35 mm. The lower portions of the wire-inlay slots are evenly distributed along the circumference and are tangent to a circle. The diameter D3 of the tangent circle varies from 54.72 mm to 60 mm.The stator tooth section is 48 mm long, with a tooth width L1 ranging from 4.75 mm to 5.25 mm, and a pole shoe section with a thickness H1 ranging from 0.3 * L1 to 0.45 * L1. Eight stator tooth sections and eight slots for wire insertion are provided. The structure is simple and the manufacturing capability is good. The stator iron core structure size is optimized, the pole shoe section thickness is increased, and a more uniform magnetic flux density distribution is achieved across the stator iron core. This reduces the phenomenon of local magnetic saturation, thereby improving the working efficiency of the electric motor and extending its service life.

Description

ELECTRIC MOTOR STATOR PUNCHING SHEET AND ELECTRIC MOTOR THAT USES THE SAME Field of Invention The exhibition relates to a stator lamination and an electric motor comprising the same. Background of the Invention In the context of improving global energy efficiency, small energy loads, such as exhaust fans and ventilators, need to meet the dual requirements of Energy Star compliance and low noise levels. Achieving this goal involves a general fan design that reduces the motor's rotational speed to minimize fan noise. The number of motor poles is increased to achieve a reduction in both motor speed and fan noise, thereby increasing the electric motor's efficiency at its rated or full-load operating point. Optimizing the parameters for both stator and rotor laminations plays a vital role in optimizing the motor's overall performance. Currently, conventional stator laminations typically include a middle section with a through-hole. The stator lamination also includes an annular yoke and a plurality of stator teeth extending inward from the annular yoke and evenly spaced. The wire slot is formed between each pair of adjacent stator teeth. Each stator tooth includes a vertical tooth root and a pole shoe located at the end of the vertical tooth root. However, the pole shoe thickness is insufficient, and according to magnetic circuit calculations and analysis, conventional stator laminations present the following disadvantages: (1) There is a significant discrepancy in the magnetic flux density distribution between the annular yoke and the stator teeth, resulting in reduced magnetic utilization and reduced motor efficiency. (2) The utilization rate of the stator lamination is suboptimal, leading to increased costs. Furthermore, there are problems with excessive local magnetic flux density, elevated temperature, significant motor noise, and reduced motor efficiency. Currently, the motor rotor core is formed by stacking multiple rotor laminations, with a plurality of rotor slots evenly distributed along the edge of each rotor lamination. The conductive elements are installed within these rotor slots. However, the coordination between the wire slots in the stator lamination and the conductive elements in the rotor lamination is not optimal, leading to the following common problems: (1) The coordination between the stator core wire slots and the rotor core rotor slots is not reasonable, leading to low motor efficiency and reduced motor life. (2) Uneven distribution of magnetic flux density occurs in both the stator lamination and the rotor lamination during different cycles, affecting motor efficiency and resulting in increased electromagnetic noise, which ultimately reduces the motor's lifespan. Summary of the Invention The exhibit features a stator lamination and an electric motor comprising it. The stator lamination offers several advantages, including a simple structure, excellent machinability, a balanced magnetic circuit, suitable magnetic flux density, improved motor efficiency, reduced motor noise, and a longer motor lifespan. The exhibition is carried out through the following technical solutions. The first objective of this description is to provide a stator lamination. The stator lamination comprises a middle section, an annular yoke, and a plurality of stator teeth. The middle section includes a central hole. The plurality of stator teeth extend from the inner side of the annular yoke and are evenly distributed within it. A wire groove is formed between each pair of adjacent stator teeth, so the annular yoke comprises a plurality of wire grooves. Each of the plurality of stator teeth comprises a tooth root and a pole shoe disposed at one end of the tooth root. The stator lamination has an outer diameter DI ranging from 61.75 mm to 68.25 mm, and the central hole has an inner diameter D2 ranging from 31.6 mm to 35 mm.The plurality of wire slots is evenly distributed around the edge of a circle, and the bottom of each wire slot is tangent to the circle. The circle has a diameter D3 that varies from 54.72 mm to 60.48 mm. The stator teeth have a tooth width L1 that varies from 4.75 mm to 5.25 mm, and the pole shoe has a thickness H1 that varies from 0.3 L1 to 0.45 L1. The stator lamination comprises eight stator teeth and eight wire slots. Preferably, the tooth width L1 of the stator teeth is 5 mm, and the thickness H1 of the pole shoe is in the range of 1.5 mm to 2.25 mm. Preferably, the annular yoke has a minimum thickness H2 that varies from 3.5 mm to 3.9 mm. Preferably, the outer diameter DI of the stator lamination is 65 mm, the center hole has an inner diameter D2 of 33.3 mm, the diameter D3 of the circle is 57.6 mm, the thickness H1 of the pole shoe is 2.15 mm, and the minimum thickness H2 of the annular yoke is 3.7 mm. Preferably, each of the plurality of wire slots comprises an arc segment and two straight segments, respectively tangent to both ends of the arc segment. Each tooth root comprises a tooth edge perpendicular to the two straight segments. The second objective of the exhibition is to provide an electric motor comprising a stator lamination. The electric motor comprises a rotating shaft, a rotor assembly, a stator assembly, and a housing assembly. The rotor assembly is arranged on the rotating shaft. The stator assembly is arranged within the housing assembly. The rotor installation-5 is arranged within the stator assembly. The stator assembly comprises a stator core, an end insulator, and a plurality of coil windings, and the stator core comprises a plurality of stator laminations stacked together. The rotor assembly comprises a rotor core comprising a plurality of rotor laminations stacked together. Each of the plurality of rotor laminations comprises a shaft hole and a plurality of rotor slots. The rotating shaft is arranged through the shaft hole, and the plurality of rotor slots are evenly distributed around the edge of each of the plurality of rotor laminations. The electric motor further comprises a plurality of conductive elements arranged respectively within the rotor slots; a rotor tooth is formed between each pair of adjacent rotor slots. Each of the plurality of stator laminations comprises eight wire slots.The ratio between the number of wire slots in each stator lamination and the number of rotor slots in each rotor lamination is in the range of 8:13 to 8:24. Preferably, the ratio between the number of wire slots in each stator lamination and the number of rotor slots in each rotor lamination is in the range of 8:15. Preferably, each of the plurality of rotor laminations has a diameter D4 ranging from 31.6 mm to 35 mm; the shaft hole has a diameter D5 ranging from 7.6 mm to 8.4 mm; and the rotor tooth has a width L2 ranging from 2.328 mm to 2.573 mm. -6Preferably, the diameter D4 of each of the plurality of rotor laminations is 33.3 mm; the diameter D5 of the shaft hole is 8 mm; and the width L2 of the rotor tooth is 2.45 mm. The following advantages are associated with exposure. The stator lamination comprises a middle section, an annular yoke, and a plurality of stator teeth. The middle section includes a central hole. The plurality of stator teeth extend from the inner side of the annular yoke and are evenly spaced. Wire slots are formed between each pair of adjacent stator teeth. Each of the plurality of stator teeth comprises a tooth root and a pole shoe disposed at one end of the tooth root. The stator lamination has an outer diameter DI ranging from 61.75 mm to 68.25 mm, and the central hole has an inner diameter D2 ranging from 31.6 mm to 35 mm. The plurality of wire slots are evenly spaced around the edge of a circle, and the bottom of each wire slot is tangent to the circle. The circle has a diameter D3 ranging from 54.72 mm to 60.48 mm. The root of the tooth has an L1 width that varies from 4.75 mm to 5.The stator core is 25 mm in diameter, and the pole shoe has a thickness H1 that varies from 0.3 L1 to 0.45 L1. The stator lamination comprises eight stator teeth and eight wire slots, providing a simple structure and excellent machinability. By optimizing the stator core size and structure and increasing the pole shoe thickness, a more uniform distribution of magnetic flux density is achieved within the stator core, reducing localized magnetic saturation effects. As a result of this improvement, motor efficiency is enhanced and motor life is extended. The electric motor comprises a rotor assembly and a stator assembly. The rotor assembly is arranged within the stator assembly. The stator assembly comprises a stator core, an end insulator, and a plurality of coil windings. A plurality of stator laminations are stacked together to form the stator core. The rotor assembly comprises a rotor core. A plurality of rotor laminations are stacked together to form the rotor core. A plurality of rotor slots are evenly distributed around the edges of each of the plurality of rotor laminations. The electric motor further comprises a plurality of conductive elements arranged respectively within the rotor slots. Each of the plurality of stator laminations comprises eight wire slots.The ratio of wire slots in each stator lamination to rotor slots in each rotor lamination ranges from 8:13 to 8:24. This design optimizes the coordination between the wire slots in the stator laminations and the rotor slots in the rotor laminations, improving motor efficiency, reducing motor noise, and extending motor life. By utilizing all eight wire slots, the manufacturing process is streamlined, and the number of wire crossings on the winder is reduced by half. This optimization increases production efficiency and ultimately reduces costs. -8 the cost of the engine. Other advantages of exposure are described in detail in the following examples. Brief Description of the Figures of the Invention Figure 1 is a cross-sectional view of the stator lamination according to Example 1 of the exhibit; Figure 2 is a local enlarged view of part A of Figure 1; Figure 3 is a cross-sectional view of an electric motor according to Example 2 of the exhibit; Figure 4 is a cross-sectional view of a rotor lamination according to Example 2 of the exhibit; and Figure 5 is a cross-sectional view of the stator lamination and rotor lamination arrangement according to Example 2 of the exhibit. Detailed Description of the Invention To further illustrate the discussion, the following modalities detail the stator lamination and an electric motor comprising the same. It should be noted that the following modalities are intended to describe, not to limit, the discussion. Example 1 As shown in Figures 1 and 2, the stator lamination 1 comprises a middle section, an annular yoke 11, and a plurality of stator teeth 12. The middle section includes a central hole. The plurality of stator teeth 12 extend from the inner side of the annular yoke 11 and are evenly spaced. Wire slots 2 are formed between each pair of adjacent stator teeth 12. Each of the plurality of stator teeth 12 comprises a tooth root 121 and a pole shoe 122 disposed at one end of the tooth root 121. The stator lamination 1 has an outer diameter DI ranging from 61.75 mm to 68.25 mm, and the central hole has an inner diameter D2 ranging from 31.6 mm to 35 mm. The plurality of wire slots is evenly distributed around the edge of a circle, and the bottom of each wire slot is tangent to the circle, and the circle has a diameter D3 that varies from 54.72 mm to 60.48 mm.The tooth root 121 has a width L1 ranging from 4.75 mm to 5.25 mm, and the pole shoe 122 has a thickness H1 ranging from 0.3 L1 to 0.45 L1. The stator lamination 1 comprises eight stator teeth 12 and eight wire slots 2, providing a simple structure and excellent machinability. By optimizing the size and structure of the stator core 51 and increasing the thickness of the pole shoe 122, a more uniform distribution of magnetic flux density is achieved in the stator core 51, reducing localized magnetic saturation effects. As a result of this improvement, motor efficiency is enhanced and motor life is extended. Preferably, the L1 width of the tooth root is 5 mm, and the H1 thickness of the polar shoe 122 is in the range of 1.5 mm to 2.25 mm. - 10 Preferably, the annular yoke 11 has a minimum thickness H2 that varies from 3.5 mm to 3.9 mm. Specifically, the outer diameter DI of the stator lamination 1 is 65 mm, the center hole has an inner diameter D2 of 33.3 mm, the diameter D3 of the circle is 57.6 mm, the thickness H1 of the pole shoe 122 is 2.15 mm and the minimum thickness H2 of the annular yoke 11 is 3.7 mm. Each of the plurality of wire slots 2 comprises an arc segment 21 and two straight segments 22 tangent to both ends of the arc segment 21. Each tooth root 121 comprises a tooth edge 1211 perpendicular to the two straight segments 22, making the winding process easier and more efficient. Example 2 As shown in Figures 3-5, an electric motor comprises a rotating shaft 3, a rotor assembly 4, a stator assembly 5, and a housing assembly 6. The rotor assembly 4 is arranged on the rotating shaft 3. The stator assembly 5 is arranged within the housing 6. The rotor assembly 4 is arranged within the stator assembly 5. The stator assembly 5 comprises a stator core 51, an end insulator 52, and a plurality of coil windings 53. A plurality of stator laminations 1 are stacked together to form the stator core 51. The rotor assembly 4 comprises a rotor core. A plurality of rotor laminations 7 are stacked together to form the rotor core. Each of the plurality of rotor laminations 7 comprises a shaft hole 71 and a plurality - 11 rotor slots 72. The rotating shaft 3 is arranged through the shaft hole 71, and the plurality of rotor slots 72 are evenly distributed around the edge of each of the plurality of rotor laminations 7. The electric motor further comprises a plurality of conductive elements 8 arranged respectively within the rotor slots 72. A rotor tooth 73 is formed between each pair of adjacent rotor slots 72. The plurality of stator laminations 1, as described in Example 1, is used in the stator assembly. Each of the plurality of stator laminations 1 comprises eight wire slots 2. The ratio of the number of wire slots 2 in each stator lamination 1 to the number of rotor slots 72 in each of the rotor laminations 7 is in the range of 8:13 to 8:24. The design optimizes the coordination between the wire slots 2 in the stator laminations 1 and the rotor slots 72 in the rotor laminations 7, resulting in improved motor efficiency, reduced motor noise, and extended motor life. By utilizing all eight wire slots 2, the manufacturing process is streamlined, and the number of wire crossings on the winder is halved. This optimization increases production efficiency and ultimately reduces the motor cost. Preferably, the ratio between the number of wire slots 2 in each stator lamination 1 and the number of rotor slots 72 in each rotor lamination 7 is 8:15. The design optimizes the coordination between the wire slots 2 in the stator core 51 and the slots 72 - 12 of the rotor in the rotor core, ensuring a uniform distribution of magnetic flux density in both the stator lamination 1 and the rotor lamination 7 during different cycles. This optimization leads to reduced localized magnetic saturation effects, minimized motor noise, and ultimately improves motor efficiency and extends motor life. Each of the rotor's multiple laminations 7 has a diameter D4 ranging from 31.6 mm to 35 mm. The shaft hole 71 has a diameter D5 ranging from 7.6 mm to 8.4 mm. The rotor tooth 73 has a width L2 ranging from 2.328 mm to 2.573 mm. Optimization improves the size and structure of the rotor laminations 7, leading to a more uniform distribution of magnetic flux density across all parts of the rotor laminations 7. Reducing localized magnetic saturation effects improves motor efficiency and extends motor life. Specifically, the diameter D4 of each of the plurality of rotor laminations 7 is 33.3 mm, the diameter D5 of the shaft hole 71 is 8 mm, and the width L2 of the rotor tooth 73 is 2.45 mm. It will be obvious to those skilled in the art that changes and modifications may be made, and therefore the objective of the appended claims is to cover all such changes and modifications.

Claims

1. A stator lamination for an electric motor, comprising: a middle part; an annular yoke; and a plurality of stator teeth; characterized in that: the middle part comprises a central hole; the plurality of stator teeth extend from a lower side of the annular yoke and are evenly distributed on the annular yoke; a wire groove is formed between each two adjacent stator teeth, the annular yoke therefore comprising a plurality of wire grooves; each of the plurality of stator teeth comprises a tooth root and a pole shoe disposed at one end of the tooth root; the stator lamination has an outer diameter DI ranging from 61.75 mm to 68.25 mm, and the central hole has an inner diameter D2 ranging from 31.6 mm to 35 mm; the plurality of wire slots is evenly distributed around the edge of a circle, and the bottom of each wire slot is tangent to the circle, and the circle has a diameter D3 ranging from 54.72 mm to 60.48 mm; the stator teeth have a tooth width L1 ranging from 4.75 mm to 5.25 mm, and the pole shoe has a thickness H1 ranging from 0.3 L1 to 0.45 Ll; and the stator lamination comprises eight stator teeth and eight wire slots.

2. The stator lamination of claim 1, characterized in that the tooth width L1 of the stator teeth is 5 mm, and the thickness H1 of the pole shoe is in the range of 1.5 mm to 2.25 mm.

3. The stator lamination of claim 1 or 2, characterized in that the annular yoke has a minimum thickness H2 ranging from 3.5 mm to 3.9 mm.

4. The stator lamination of claim 3, characterized in that the outer diameter DI of the stator lamination is 65 mm, the center hole has an inner diameter D2 of 33.3 mm, the diameter D3 of the circle is 57.6 mm, the thickness H1 of the pole shoe is 2.15 mm, and the minimum thickness H2 of the annular yoke is 3.7 mm.

5. The stator lamination of claim 4, characterized in that each of the plurality of wire slots comprises an arc segment and two straight segments respectively tangent to both ends of the arc segment, and each tooth root comprises a tooth edge perpendicular to the two straight segments.

6. An electric motor, comprising: a rotating shaft; a rotor assembly; a stator assembly; and a housing assembly; characterized in that the rotor assembly is disposed on the rotating shaft; the stator assembly is disposed within the housing assembly; the rotor assembly is disposed - 15 within the stator assembly; the stator assembly comprises a stator core, an end insulator, and a plurality of coil windings, and the stator core comprises a plurality of stator laminations of any of claims 1-5 stacked together; the rotor assembly comprises a rotor core comprising a plurality of rotor laminations stacked together; each of the plurality of rotor laminations comprises a shaft hole and a plurality of rotor slots;The rotating shaft is arranged through the shaft hole, and the plurality of rotor slots are evenly distributed around an edge of each of the plurality of rotor laminations; the electric motor further comprises a plurality of conducting elements arranged respectively within the rotor slots; a rotor tooth is formed between each pair of adjacent rotor slots; and each of the plurality of stator laminations comprises eight wire slots; and the ratio of the number of wire slots in each stator lamination to the number of rotor slots in each rotor lamination is in the range of 8:13 to 8:

24.

7. The electric motor of claim 6, characterized in that the ratio of the number of wire slots in each stator lamination to the number of rotor slots in each rotor lamination is in the range of 8:

15.

8. The electric motor of claim 7, iviA / a / ζυζό / υυυό iu - 16 characterized in that each of the plurality of rotor laminations has a diameter D4 ranging from 31.6 mm to 35 mm; the shaft hole has a diameter D5 ranging from 7.6 mm to 8.4 mm; and the rotor tooth has a width 5 L2 ranging from 2.328 mm to 2.573 mm.

9. The electric motor of claim 8, characterized in that the diameter D4 of each of the plurality of rotor laminations is 33.3 mm; the diameter D5 of the shaft hole is 8 mm; and the width L2 10 of the rotor tooth is 2.45 mm.

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