Motor stator insulation system

Abstract

The invention provides a motor stator insulation system, which comprises a stator core, a first insulation framework, a second insulation framework and slot insulation paper, and is characterized in that the first insulation framework and the second insulation framework are respectively assembled at two ends of the stator core. A first cover plate and a second cover plate are arranged at the groove bottom and the groove shoulder of the groove part of the insulation framework, the first cover plate and the second cover plate form a semi-closed insulation layer structure, the groove insulation paper is unfolded into special-shaped insulation paper, the main body is clamped into the groove part of the stator iron core and is tightly attached to the first cover plate and the second cover plate, and the protruding structure extends out of the groove part of the insulation framework from the two side edges. The gap between the first cover plate and the second cover plate is filled, and the protruding structure is matched with the first cover plate and the second cover plate in a limiting and pressing mode. The insulation framework and the groove insulation paper are mutually limited, mutually compensated, wriggled relative to materials and matched with an open-loop gap, so that the insulation strength is improved, the tension on an enameled wire during winding is relieved, the safety strength of an insulation system is improved, and meanwhile, the utilization rate of an effective groove of the motor is improved.

Description

Technical Field

[0001] The present invention relates to the field of motor stator insulation systems, and in particular to a motor stator insulation system. Background Art

[0002] The motor consists of two main parts: the stator and the rotor. The stator of the motor is generally insulated with insulating paper. The insulating skeleton is an injection molded part that is set at the end of the motor stator and has a wire-passing structure design. Slot insulating paper is placed in the slots of the insulating skeleton and the stator core to insulate the motor stator core slots and stator winding wire packages. It is an insulating structure that separates the stator winding from the stator core, ensuring that the electrical strength of the motor can make the electrical performance qualified, safe and reliable.

[0003] The slot cover plate of the insulating skeleton used in the concentrated winding insulation system in the prior art is usually a closed-loop insulation layer structure based on the slot shape. The slot shape of the insulating skeleton is smaller than the slot shape of the stator core. The slot insulation paper inserted in the slot is a rectangular structure. The insulating skeleton and the insulating paper in the stator core slot are matched with a gap. At the same time, considering the properties of the nylon or other insulating materials used and the matching gap, the tooth width of the insulating skeleton is greater than the tooth width of the stator core, usually greater than 0.75mm, and the amount of insulating skeleton material used is large.

[0004] However, this type of insulating skeleton reduces the effective slot area of ​​the stator core, reduces the effective slot fill rate of the motor, and reduces the motor efficiency; during the winding process, the winding tension can easily cause the closed-loop slot cover to be damaged, resulting in reduced motor safety breakdown strength and insulation strength; after the winding is wound, due to the slot cover structure and thickness, there is a 0.3 to 0.5 mm gap between the winding and the stator core, and the winding is prone to skin effect, affecting the motor performance, safety and life; the enameled wire tension exists during winding and cannot be released, causing the electromagnetic force of the motor winding and the tension to form a lateral force, causing electromagnetic noise, increasing the motor noise and shortening its life. Summary of the invention

[0005] In order to solve the above problems and other problems, the present invention is a motor stator insulation system implemented by the following technical solutions, including: a stator core, including a main body, a first tooth portion and a first slot portion, the main body is provided with a plurality of evenly distributed first tooth portions, and the first slot portion is located between adjacent first tooth portions; a first insulating skeleton and a second insulating skeleton, the first insulating skeleton and the second insulating skeleton are respectively assembled at two ends of the stator; the first insulating skeleton includes an annular protection frame, a second tooth portion, a second slot portion, a first cover plate and a second cover plate, the annular frame is evenly distributed with a plurality of second tooth portions, the second slot portion is located between two adjacent second tooth portions, the first cover plate is arranged at the slot bottom position of the second slot portion, and the second The cover plate is arranged at the slot shoulder position of the second slot portion, the first cover plate and the second cover plate are located at the inner side end of the first insulating frame, and the first cover plate and the second cover plate are thickened insulating layers; slot insulating paper, the slot insulating paper and the first cover plate and the second cover plate are mutually limited and compensated; the slot insulating paper comprises a body, a folding line and a protruding structure, a plurality of the folding lines are arranged on the body, the protruding structure is symmetrically arranged on the long side of the body, after folding along the folding line, the body is embedded in the first slot portion, the protruding structure passes through the second slot portion and passes out, the slot insulating paper portion located in the first slot portion and the second slot portion is in close contact with the inner side wall of the slot, and the body is in close contact with the first cover plate and the second cover plate.

[0006] In one embodiment, the first cover plate and the second cover plate respectively press the body located at the bottom and shoulder of the first groove portion, and the body is tightly attached to the inner wall of the first groove portion; or the first cover plate and the second cover plate are tightly attached to the inner wall of the first groove portion, and the body presses the first cover plate and the second cover plate.

[0007] In one embodiment, the stack thickness of the stator core is set to L, and the axial length of the slot insulation paper located in the first slot portion and the second slot portion is L+2mm to L+3mm.

[0008] In one embodiment, the axial length of the protruding structure is 1.1 to 1.6 times the depth of the second groove portion.

[0009] In one embodiment, the first cover plate and the second cover plate are thickened insulating layers, and the first cover plate and the second cover plate extend toward the inner wall of the first groove portion respectively.

[0010] In one embodiment, the first cover plate and the second cover plate extend to a depth of 3 mm to 10 mm.

[0011] In one embodiment, the first insulating frame further includes a wire guard post and a wire guard plate, wherein the wire guard post is arranged at the outer end edge of the annular protective frame, and the wire guard plate is arranged at the bottom of the second tooth portion and located at the outer end of the annular protective frame.

[0012] In one embodiment, the insulation system is used for an outer rotor motor stator insulation system or an inner rotor motor insulation system.

[0013] Due to the application of the above technical scheme, the present invention has the following advantages compared with the prior art: the insulating skeleton and slot insulating paper in a stator insulation system proposed by the present invention limit each other, compensate each other, creep relative to the material, cooperate with the open-loop gap, meet the dynamic material relative compensation and insulation performance, relieve the tension on the enameled wire during winding, improve the insulation strength capacity of the motor system by more than 30%, and at the same time improve the utilization rate of the effective slots of the motor by more than 10%, thereby increasing the life of the motor and reducing the electromagnetic noise and vibration generated by the lateral force of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shown is a schematic diagram of a stator insulation system of the present invention;

[0015] Figure 2 Shown is an exploded view of the stator insulation system structure of the present invention;

[0016] Figure 3 It is a schematic diagram of the inner side end of the first insulating frame of the present invention;

[0017] Figure 4 Shown is a schematic diagram of the outer end of the first insulating skeleton of the present invention;

[0018] Figure 5 Shown is a schematic diagram of the slot insulation paper of the present invention;

[0019] Figure 6 Display as Figure 1 Cross-sectional view of .

[0020] 1- stator insulation system; 11- stator core; 111- main body; 112- first tooth portion; 113- first slot portion; 12- first insulating skeleton; 121- annular protection frame; 122- second tooth portion; 123- second slot portion; 124- first cover plate; 125- second cover plate; 126- wire guard post; 127- wire guard plate; 13- second insulating skeleton; 14- slot insulating paper; 141- main body; 142- folding line; 143- protruding structure. DETAILED DESCRIPTION

[0021] See also Figures 1 to 6The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0022] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for the understanding and reading of those skilled in the art, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "left", "right", "upper", "lower" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0023] In the present invention, for the sake of clear description, the following explanation is made: the observer faces the attached Figure 1 It is observed that one end of the insulating frame installed with the stator core is set as the "inner end" and the other end is set as the "outer end". The above description is only for the convenience of describing the present invention clearly, and does not indicate or imply that the structure or parts referred to must have a specific orientation or be constructed in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0024] Please combine Figure 1 and Figure 2 A motor stator insulation system 1 is used to separate a stator winding and a stator core slot and insulate the two. The stator insulation system 1 includes a stator core 11, a first insulation frame 12, a second insulation frame 13 and a slot insulation paper 14. The first insulation frame 12 and the second insulation frame 13 are respectively assembled at both ends of the stator core 11. The slot insulation paper 14 is embedded in the stator core 11, the first insulation frame 12 and the second insulation frame 13. The first insulation frame 12, the second insulation frame 13 and the slot insulation paper 14 are mutually limited, pressed and matched.

[0025] Specifically, the structures and installation methods of the first insulating frame 12 and the second insulating frame 13 are completely the same, so the first insulating frame 12 is taken as an example for specific description in this application.

[0026] The stator core 11 includes a main body 111 , a first tooth portion 112 and a first slot portion 113 . The main body 111 is provided with a plurality of evenly distributed first tooth portions 112 . The first tooth portions 112 are used for winding. The first slot portions 113 are located between adjacent first tooth portions 112 .

[0027] Please combine Figure 3 and Figure 4 The first insulating skeleton 12 includes an annular protective frame 121, a second tooth portion 122, a second groove portion 123, a first cover plate 124, a second cover plate 125, a wire protection column 126 and a wire protection plate 127. The annular frame 121 is provided with a plurality of evenly distributed second tooth portions 122; the second groove portion 123 is located between adjacent second tooth portions 122, and the position of the second groove portion 123 corresponds to the position of the first groove portion 113; the first cover plate 124 is arranged at the bottom position of the groove 123, the second cover plate 125 is arranged at the groove shoulder position of the second groove portion 123, the first cover plate 124 and the second cover plate 125 are located at the inner side end of the annular frame 121, and the first cover plate 12 4 and the second cover plate 125 are thickened insulation layers, the first cover plate 124 and the second cover plate 125 extend to the second groove portion 123, and the extension thickness is 3mm to 10mm. The first cover plate 124 and the second cover plate 125 press the slot insulation paper 14 into the first groove portion 113, and there is a 0.1mm clearance fit between the first cover plate 124 and the second cover plate 125 and the slot insulation paper 14; the wire guard post 126 is arranged at the outer end edge of the annular protective frame 121 for installing and fixing the winding; the wire guard plate 127 is arranged at the bottom of the second tooth portion 122, located at the outer end of the annular frame body 121, and the wire guard plate 127 is used to install and protect the winding.

[0028] Specifically, the first cover plate 124 and the second cover plate 125 may also be in close contact with the inner wall of the first slot portion 113 , and the slot insulation paper 14 is pressed on the first cover plate 124 and the second cover plate 125 .

[0029] Please combine Figure 5 and Figure 6The slot insulating paper 14 is unfolded into a special-shaped structure, including a main body 141, a folding line 142 and a protruding structure 143. The main body 141 is unfolded into a rectangular shape; a plurality of folding lines 142 are arranged on the main body 141, so that the slot insulating paper 14 is folded along the folding lines 142 and then embedded in the first slot portion 113, and is in close contact with the inner wall of the first slot portion 113, and the main body 141 is in close contact with the first cover plate 124 and the second cover plate 125; the protruding structure 143 is symmetrically arranged on the long side of the main body 141, and the position of the protruding structure 143 after folding is in close contact with the inner wall of the first slot portion 113. The two side edges of the second groove portion 123 correspond to each other, and the protruding structure 143 passes through the second groove portion 123 and out, and the part located in the second groove portion 123 is tightly attached to the side wall of the second groove portion 123, and the protruding structure 143 fills the insulating layer gap between the first cover plate 124 and the second cover plate 125. The protruding structure 143 and the first cover plate 124 and the second cover plate 125 limit and compensate each other to form a closed insulating layer surrounding the second groove portion 123, and the protruding structure 143 limits the second tooth portion 122, thereby enhancing the insulation strength of the second tooth portion 122.

[0030] Specifically, the first cover plate 124 and the second cover plate 125 respectively press the main body 141 located at the bottom and shoulder of the first groove portion 113, and the main body 141 is tightly attached to the inner wall of the first groove portion 113; or the first cover plate 124 and the second cover plate 125 are tightly attached to the inner wall of the first groove portion 113, and the main body 141 presses the first cover plate 124 and the second cover plate 125.

[0031] Specifically, the stack thickness of the stator core is set to L, and the axial length of the slot insulation paper 14 located in the first slot portion 113 and the second slot portion 123 is L+2mm to L+3mm.

[0032] Specifically, the axial length of the protruding structure 143 is greater than the depth of the second groove portion 123 , and is 1.1 to 1.6 times the depth of the second groove portion 123 .

[0033] The preferred material of the first insulating frame 12 and the second insulating frame 13 is PA66, and the preferred material of the slot insulating paper 14 is DMD. In this embodiment, the matching effect is optimal and the safety factor is improved.

[0034] The stator insulation system 1 proposed in this application fully considers the material properties and insulation characteristics, and ensures safe and reliable insulation from the perspective of static and dynamic systems. It is suitable for concentrated winding motors, permanent magnet synchronous motors, DC brushless motors and asynchronous motors, and is suitable for inner rotor motors and outer rotor motors. Under the stator insulation system 1, the relatively limited area of ​​the slot is the largest, and the winding tension is buffered. The first insulation frame 12, the second insulation frame 13 and the slot insulation paper 14 are matched in a mutually limited pressing manner, with a buffer space and dynamic close contact, which effectively reduces the gap between the stator insulation system 1 and the stator core 11, while ensuring that the relatively limited area of ​​the slot remains unchanged, thereby improving the slot fill rate. During the winding process, the dynamic tension direction of the enameled wire is radial force, which seriously damages the slot shoulder and the slot bottom. Since the insulating layer formed by the first cover plate 124 and the second cover plate 125 is a semi-closed loop structure, the first cover plate 124 extends into the slot bottom position of the first slot portion 113 for compensation, and the second cover plate 125 extends into the slot shoulder position of the first slot portion 113 for compensation. The slot insulation paper 14 is inserted into the first slot portion 113, and the first cover plate 124 and the second cover plate 125 press the slot insulation paper 14 to limit the slot insulation paper 14. The protruding structure 143 extends out of the first slot portion 113 and fits the inner wall of the second slot portion 123, effectively alleviating the radial force. The first insulating skeleton 12, the second insulating skeleton 13 and the slot insulating paper 14 are mutually limited, mutually compensated, and relative to the material creep. During the winding process, there is spatial movement and relative buffering of the two materials, which reduces the gap between the slot insulating paper 14 and the stator core 11, reduces insulation damage and wire package tension, and is equipped with an open-loop gap, which is suitable for static insulation capacity, suitable for dynamic enameled wire tension buffering and decomposition of winding winding, and reduces the transverse current when the motor is running, that is, reduces the electromagnetic noise and vibration of the motor.

[0035] In summary, the stator insulation system and the insulation frame and insulation paper in the motor proposed by the present invention limit each other, compensate each other, creep relative to the material, cooperate with the open-loop gap, meet the dynamic material relative compensation and insulation performance, relieve the tension on the enameled wire during winding, and improve the insulation strength capacity of the motor system by more than 30%. At the same time, the effective slot utilization rate of the motor is increased by more than 10%, thereby increasing the life of the motor and reducing the electromagnetic noise and vibration generated by the lateral force of the motor.

[0036] Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value. The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology can modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A motor stator insulation system, characterized in that: include: The stator core comprises a main body, a first tooth portion and a first slot portion, wherein the main body is provided with a plurality of evenly distributed first tooth portions, and the first slot portion is located between adjacent first tooth portions; A first insulating frame and a second insulating frame, wherein the first insulating frame and the second insulating frame are respectively assembled at two ends of the stator; the first insulating frame comprises an annular protection frame, a second tooth portion, a second slot portion, a first cover plate and a second cover plate, a plurality of the second tooth portions are evenly distributed on the annular frame, the second slot portion is located between two adjacent second tooth portions, the first cover plate is arranged at the slot bottom position of the second slot portion, the second cover plate is arranged at the slot shoulder position of the second slot portion, the first cover plate and the second cover plate are located at the inner side end of the first insulating frame, and the first cover plate and the second cover plate are thickened insulating layers; Slot insulation paper, wherein the slot insulation paper and the first cover plate and the second cover plate are mutually limited and compensated; the slot insulation paper comprises a body, a folding line and a protruding structure, a plurality of folding lines are arranged on the body, the protruding structures are symmetrically arranged on the long sides of the body, after folding along the folding lines, the body is embedded in the first slot portion, the protruding structure passes through the second slot portion and comes out, the slot insulation paper portions located in the first slot portion and the second slot portion are in close contact with the inner side wall of the slot, and the body is in close contact with the first cover plate and the second cover plate.

2. A motor stator insulation system according to claim 1, characterized in that: The first cover plate and the second cover plate respectively press the main body located at the bottom and shoulder of the first groove portion, and the main body is tightly attached to the inner wall of the first groove portion; or the first cover plate and the second cover plate are tightly attached to the inner wall of the first groove portion, and the main body presses the first cover plate and the second cover plate.

3. The motor stator insulation system according to claim 2, characterized in that: The stack thickness of the stator core is set to L, and the axial length of the slot insulation paper located in the first slot portion and the second slot portion is L+2mm to L+3mm.

4. A motor stator insulation system according to claim 3, characterized in that: The axial length of the protruding structure is 1.1 to 1.6 times the depth of the second groove portion.

5. The motor stator insulation system according to claim 2, characterized in that: The first cover plate and the second cover plate are thickened insulating layers, and the first cover plate and the second cover plate extend toward the inner wall of the first groove portion respectively.

6. The motor stator insulation system according to claim 5, characterized in that: The first cover plate and the second cover plate extend to a depth of 3 mm to 10 mm.

7. The motor stator insulation system according to claim 1, characterized in that: The first insulating frame also includes a wire protection column and a wire protection plate. The wire protection column is arranged at the outer end edge of the annular protective frame, and the wire protection plate is arranged at the bottom of the second tooth portion and located at the outer end of the annular protective frame.

8. The motor stator insulation system according to claim 1, characterized in that: The insulation system is used for an outer rotor motor stator insulation system or an inner rotor motor insulation system.

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