Motor stator structure

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a motor stator structure. While the insulation strength is ensured, the reliability of the motor is improved and the service life is prolonged, the usage amount of insulation materials can be reduced, the effective usable area in the groove is increased and the motor performance is improved. The motor comprises a stator core, a stator winding assembled in an iron core groove of the stator core, and a groove insulator installed between the inner surface of the iron core groove and the winding. The two ends of the interior of the iron core groove are both arranged to be step-shaped, and step-shaped concave extensions are formed. The groove insulator comprises a main body groove insulator, two ends of the main body groove insulator are respectively sleeved with a reinforcing insulator, and the main body groove insulator and the reinforcing insulators are connected into a whole.

Description

Technical Field

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

[0002] Currently, if Figure 1-2 In motor structures both domestically and internationally, the slot insulation 1, the insulating material between the core slots and the winding conductors, is typically made of single- or multi-layer insulation material. The thickness of the slot insulation throughout the core 2 is uniform. However, in practical engineering and during motor operation, damage and aging of the slot insulation often occur at the ends of the core, where the slot insulation protrudes from the core (i.e., at the root of the end slots 4). This is because the winding 3, having just emerged from the core, experiences bending deformation at the winding ends, where stress is concentrated. This contact between the insulation and the sharp core point at this location increases the risk of insulation damage and hidden insulation risks.

[0003] Furthermore, during use, the temperature of the winding ends of motors is generally higher than that of the core and slots, causing more severe thermal aging of the slot insulation there than elsewhere in the core. Therefore, the insulation material at the root of the slots in existing motors presents a significant risk of insulation damage.

[0004] Some companies have also solved this problem by thickening the slot insulation as a whole, but this will reduce the limited space in the slot, reduce the heat dissipation efficiency of the slot, and significantly increase the amount of slot insulation material used. Summary of the Invention

[0005] The utility model aims to solve the defects in the prior art and provides a motor stator structure.

[0006] To achieve the above-mentioned object, the present invention adopts the following technical solution: the motor stator structure includes a stator core, a stator winding assembled in the core slots (of the stator core), and a slot insulator installed between the inner surface of the core slots and the windings;

[0007] It is characterized in that the inner and both ends of the core slot are arranged in a stepped shape to form a stepped concave extension;

[0008] The slot insulation comprises a main slot insulation, both ends of the main slot insulation are respectively sleeved with a reinforced insulation, and the main slot insulation and the reinforced insulation are connected as a whole.

[0009] Furthermore, the two stepped depressions have the same epitaxial size and shape.

[0010] Furthermore, the stepped recess extension forms a stepped structure with the adjacent core slot inner walls, and the stepped recess extension serves as the lower tread of the stepped structure, and the adjacent core slot inner walls serve as the higher tread, forming a kick surface (with a certain height) between the stepped recess and the adjacent core slot inner walls.

[0011] Furthermore, the width of the stepped recess extension is 3 to 10 mm.

[0012] Furthermore, the height of the riser is consistent with the thickness of the reinforced insulation.

[0013] Furthermore, the reinforced insulation adopts insulating paper.

[0014] Furthermore, the main slot insulation is made of insulating material.

[0015] Furthermore, when the slot insulation is assembled in the corresponding core slot, the reinforced insulation portion is located within the stepped recessed extension.

[0016] Compared with the prior art, the utility model has beneficial effects.

[0017] The utility model can reduce the amount of insulating material used, increase the effective use area in the slot, and improve the performance of the motor while ensuring the insulation strength, improving the reliability of the motor and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0019] Figure 1 It is a schematic diagram of the motor stator structure in the prior art.

[0020] Figure 2 It is a schematic diagram of the explosion of the motor stator in the prior art.

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the stator core of the utility model.

[0022] Figure 4 This is the main view of the stator core of the utility model.

[0023] Figure 5 yes Figure 4 AA schematic diagram.

[0024] Figure 6 yes Figure 3 Enlarged schematic diagram of point B.

[0025] Figure 7 It is an exploded schematic diagram of the slot insulation of the utility model.

[0026] Figure 8This is a schematic diagram of the utility model after the slot insulation is combined.

[0027] Figure 9-10 This is a schematic diagram of the position of the slot insulation and the stator core of the utility model.

[0028] Figure 1-2 1. Slot insulation; 2. Iron core; 3. Winding; 4. Root of the end slot (where the slot insulation protrudes from the iron core);

[0029] Figure 3-10 5. Stator core; 6. Stepped concave extension; 8. Lower tread; 9. Riser; 10. Inner wall of adjacent core slot; 11. Main slot insulation; 12. Reinforced insulation. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and beneficial effects of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0031] like Figure 3-10 As shown, the stator structure of the motor of the present invention includes a stator core, stator windings mounted within the core slots (of the stator core), and slot insulation installed between the inner surface of the core slots and the windings. The core slots are stepped both inside and at both ends, forming a stepped concave extension. The slot insulation includes a main slot insulation, each end of which is fitted with a reinforced insulation, which is integrally connected to the main slot insulation. The reinforced insulation is made of insulating paper, and the main slot insulation is made of an insulating material. When the slot insulation is mounted within the corresponding core slot, the reinforced insulation portion is located within the stepped concave extension.

[0032] In Example 1, reinforced insulation and conventional insulation (also known as main slot insulation) are connected together to form a complete insulation system for the motor. Reinforced insulation is concentrated in key areas where higher insulation performance is required (for example, where the slot insulation at both ends of the core protrudes from the core), while conventional insulation covers other areas. The two work together to protect the motor from electrical faults. Among them:

[0033] Reinforced insulation: Provides enhanced electrical insulation performance to withstand harsh operating conditions such as high voltage or high frequency, ensuring motor safety and reliability. The height of the riser (i.e., the depth of the stepped recess) is consistent with the thickness of the reinforced insulation. The thickness of the reinforced insulation material (such as insulating paper) matches the depth of the stepped design, ensuring a tight fit.

[0034] Conventional insulation (also known as main slot insulation): covers the corresponding core slots of the stator core and components such as windings, and is used to provide basic electrical insulation performance, prevent current leakage and short circuit, and ensure the normal operation of the motor.

[0035] In Example 2, the two stepped recessed extensions have the same size and shape. The stepped recessed extensions and the adjacent core slot inner walls form a staircase structure, with the stepped recessed extensions serving as the lower tread of the staircase structure, and the adjacent core slot inner walls serving as the higher tread. A riser of a certain height is formed between the stepped recesses and the adjacent core slot inner walls. The width of the stepped recessed extensions ranges from 3 to 10 mm, and the specific length can be determined by the designer based on the difficulty of the process.

[0036] The stepped design better accommodates and secures the insulation material, especially the reinforced insulation. The reinforced insulation is designed to coordinate with the stepped portion within the core slot. The depth of the stepped design precisely matches the thickness of the reinforced insulation (insulating paper), ensuring a tight fit on the core and enhancing insulation effectiveness. The stepped structure not only provides additional space for the insulation material but also helps secure it through its geometry, preventing displacement or damage during motor operation.

[0037] Specifically, first, the utility model solves the problem that the traditional motor product design and process cause the insulation material at the root of the motor end slot to have a greater risk of insulation damage. The specific implementation method is:

[0038] 1. The root of the notch at the end of the core is designed to be stepped. This design allows the reinforced insulation material to fit more closely to the core, reducing the risk of insulation damage caused by factors such as mechanical stress and thermal stress.

[0039] 2. The step depth matches the thickness of the reinforced insulation material to ensure that the insulation material can completely fill the stepped area at the root of the notch to provide better mechanical support and electrical insulation.

[0040] 3. The stepped design helps fix the insulation material through its geometric shape, preventing it from displacement or damage during motor operation, thereby improving the stability and durability of the insulation material.

[0041] This design, through its stepped design and enhanced insulation material, significantly reduces the risk of insulation damage at the root of the motor's end slots, improving the motor's overall insulation performance. It also enhances the motor's safety and reliability under harsh operating conditions such as high voltage or high frequency.

[0042] Second, the present invention solves the problem that the existing technology solves this problem by thickening the slot insulation as a whole, which reduces the limited space in the slot, reduces the heat dissipation efficiency in the slot, and significantly increases the amount of slot insulation material used. The specific implementation method is:

[0043] 1. Adopt a design of locally reinforced insulation, that is, using reinforced insulation material at the key location at the root of the slot at the end of the motor, rather than thickening the slot insulation as a whole. This local reinforcement method not only solves the problem of insulation damage, but also avoids the negative impact of overall thickening.

[0044] 2. By locally reinforcing the insulation, the rest of the slot can still maintain thinner conventional insulation, thereby maximizing the use of the limited space in the slot and improving the power density and efficiency of the motor.

[0045] 3. Since the thickness of the insulation material in other parts of the slot is not increased, the heat dissipation path in the slot is not excessively blocked, thereby maintaining good heat dissipation efficiency and helping to control the temperature of the motor during long-term operation.

[0046] 4. Locally enhanced insulation design reduces the overall demand for insulation materials, lowers material costs, and also reduces complexity and waste in the manufacturing process.

[0047] In other words, by locally reinforcing the insulation, the space utilization within the slot is optimized, improving the power density and efficiency of the motor. This also maintains the heat dissipation efficiency within the slot, helping to control the temperature of the motor during long-term operation and extending its service life.

[0048] The utility model has a new motor iron core and insulation structure: by optimizing the iron core slot size and insulation structure adjustment at individual positions, the motor of the same size can have better performance, save the use of insulation materials, improve the safety and reliability of the insulation structure, and extend the service life of the motor.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. Therefore, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope defined by the claims of the present invention.

Claims

1. A motor stator structure comprising a stator core, a stator winding mounted in a core slot, and a slot insulator mounted between the inner surface of the core slot and the winding; characterized in that: The inner and both ends of the core slot are arranged in a stepped shape, forming a stepped concave extension; The slot insulation comprises a main slot insulation, both ends of the main slot insulation are respectively sleeved with a reinforced insulation, and the main slot insulation and the reinforced insulation are connected as a whole.

2. The motor stator structure according to claim 1, characterized in that: The two stepped depressions have the same outer size and shape.

3. The motor stator structure according to claim 1, characterized in that: The stepped recess extension forms a stepped structure with the adjacent core slot inner wall, and the stepped recess extension serves as the lower tread of the stepped structure, the adjacent core slot inner wall serves as the higher tread, and a riser is formed between the stepped recess and the adjacent core slot inner wall.

4. A motor stator structure according to claim 2 or 3, characterized in that: The width of the stepped depression extension is 3 to 10 mm.

5. The motor stator structure according to claim 3, characterized in that: The height of the riser is consistent with the thickness of the reinforced insulation.

6. The motor stator structure according to claim 1, characterized in that: The reinforced insulation adopts insulating paper.

7. The motor stator structure according to claim 1, characterized in that: The main body slot insulation is made of insulating material.

8. The motor stator structure according to claim 1, characterized in that: When the slot insulation is assembled in the corresponding iron core slot, the reinforced insulation portion is located within the stepped recessed extension.

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