An insulation protection structure for motor stator slot coils

Abstract

This utility model discloses an insulation protection structure for stator slot coils of an electric motor, comprising: a copper flat wire coil passing through a stator winding slot and wound in a zigzag pattern on the stator, the portion of the copper flat wire coil located within the stator winding slot forming an effective edge; an insulating partition clamping adjacent copper flat wire coils within the same slot; a U-shaped insulating plate embedded in the stator winding slot, the slot opening of the U-shaped insulating plate facing the same direction as the slot opening of the stator winding slot; and an insulating plug located at the slot opening of the stator winding slot, the insulating plug sealing the slot opening of the U-shaped insulating plate to insulate and surround the effective edge of the copper flat wire coil, with the plug head body of the insulating plug embedded in the slot opening of the U-shaped insulating plate and pressing the effective edge. This utility model solves the problems of insufficient insulation protection for the coil within the stator slot and unreliable fixation of the effective edge by forming an insulating cavity through the U-shaped insulating plate and the insulating plug, and in conjunction with a soft plug pressing structure.

Description

Technical Field

[0001] This utility model belongs to the field of motor insulation coil technology, and particularly relates to an insulation protection structure for motor stator slot coils. Background Technology

[0002] Traditional motor stator slot insulation uses sheathed paper or slot wedges for fixation. Sheathed paper has low mechanical strength and is easily damaged during winding, and shrinks at high temperatures, causing it to separate from the slot wall. The slot wedges exert uneven pressure on the flat wire coils, which can easily loosen due to vibration, causing coil movement, insulation wear, or even inter-turn short circuits. Copper flat wire coils generate a lot of heat, and existing interlayer insulation cannot completely fill the gaps, leaving residual air gaps that cause partial discharge and accelerate insulation aging. It is difficult to achieve both strong insulation and non-destructive clamping, resulting in insufficient insulation life and operational reliability. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides an insulation protection structure for the stator slot coil of a motor. The structure forms an insulating cavity by means of a U-shaped insulating plate and an insulating plug, and is combined with a soft plug pressing structure to solve the problems of insufficient insulation protection for the coil in the stator slot and unreliable effective edge fixing.

[0004] Technical solution: To achieve the above objectives, this utility model provides an insulation protection structure for motor stator slot coils, comprising:

[0005] A copper flat wire coil is inserted into the stator winding slot and wound in a zigzag pattern on the stator, wherein the portion of the copper flat wire coil located in the stator winding slot constitutes an effective side;

[0006] An insulating partition is clamped between adjacent copper flat wire coils in the same slot;

[0007] A U-shaped insulating plate is embedded in the stator winding slot, and the slot opening of the U-shaped insulating plate faces the same direction as the slot opening of the stator winding slot.

[0008] An insulating plug located at the slot opening of the stator winding, the insulating plug closes the slot opening of the U-shaped insulating plate to insulate the effective side of the copper flat wire coil from the U-shaped insulating plate, and the plug head body of the insulating plug is embedded in the slot opening of the U-shaped insulating plate and presses against the effective side.

[0009] Furthermore, the insulating partition is an insulating paperboard, which fills the gap between adjacent copper flat wire coils by elastic deformation when compressed.

[0010] Furthermore, the U-shaped insulating plate is fixed by being embedded into the stator winding slot through an interference fit.

[0011] Furthermore, the plug body of the insulating plug is a soft plug structure, which is embedded in the slot of the closed U-shaped insulating plate and flexibly presses the effective edge of the copper flat wire coil located in the stator winding slot.

[0012] Furthermore, the insulating plug also includes a plug head that is fixedly connected to the plug head body, and the insulating plug is fixed to the inner circle of the stator core of the stator through the plug head.

[0013] Furthermore, it includes fasteners, the plug head being fixedly connected to the inner circle of the stator core by the fasteners.

[0014] Furthermore, the fastener is a locating pin that passes through the head of the plug and extends into the stator, used to position the insulating plug and prevent its circumferential and / or axial movement.

[0015] Furthermore, the outer surface of the copper flat wire coil is covered with a multi-layer composite insulating sleeve, which, from the inside out, comprises at least:

[0016] A buffer insulation layer with a pleated or corrugated structure;

[0017] A continuous mica tape layer covering the buffer insulation layer;

[0018] And a dense encapsulation layer that adheres to the continuous mica tape layer, wherein the dense encapsulation layer is an epoxy resin impregnation layer or a polyesterimide varnish layer.

[0019] Beneficial effects: The U-shaped insulating plate and insulating plug of this invention form an insulating cavity, effectively isolating the copper flat wire coil from the stator core and the external environment, preventing creepage and electrical short circuits. Simultaneously, the plug head of the insulating plug is embedded in and presses against the coil, suppressing axial movement during operation and improving mechanical stability. It balances strong insulation with non-destructive pressing, improving insulation life and operational reliability. Attached Figure Description

[0020] Figure 1 This is an enlarged structural schematic diagram of the stator axial cross section and the stator winding slot area;

[0021] Figure 2 A schematic diagram of a copper flat wire coil wound in a zigzag pattern. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] like Figure 1As shown, an insulation protection structure for a motor stator slot coil includes: a copper flat wire coil 2 that passes through a stator winding slot 10 and is wound in a zigzag pattern on the stator 1, the portion of the copper flat wire coil 2 located within the stator winding slot 10 forming an effective edge; an insulating partition 3 clamping adjacent copper flat wire coils 2 within the same slot; a U-shaped insulating plate 4 embedded in the stator winding slot 10, the slot opening of the U-shaped insulating plate 4 facing the same direction as the slot opening of the stator winding slot 10; and an insulating plug 5 located at the slot opening of the stator winding slot 10, the insulating plug 5 closing the slot opening of the U-shaped insulating plate 4 to insulate and surround the effective edge of the copper flat wire coil 2, and the plug head body 51 of the insulating plug 5 being embedded in the slot opening of the U-shaped insulating plate 4 and pressing the effective edge. The U-shaped insulating plate 4 and the insulating plug 5 form an insulating cavity, which isolates the effective edge of the copper flat wire coil 2 from the stator core and the external environment to a certain extent, preventing creepage and electrical short circuits. At the same time, the plug head body 51 of the insulating plug 5 is embedded in the coil to compress it, suppressing axial movement during operation and improving mechanical stability. It combines strong insulation with non-destructive compression, improving insulation life and operational reliability.

[0024] The insulating partition 3 is an insulating paperboard, which fills the gap between adjacent copper flat wire coils 2 by elastic deformation when compressed. The elastic deformation of the insulating paperboard after compression dynamically fills the gap between adjacent coils in the same slot, eliminating the risk of partial discharge and absorbing micro-vibrations, thus enhancing the reliability of the insulation.

[0025] The U-shaped insulating plate 4 is fixed by being embedded into the stator winding slot 10 through an interference fit, eliminating the risk of adhesive peeling and ensuring the structural integrity of the insulating cavity.

[0026] The plug body 51 of the insulating plug 5 is a soft plug structure, which is embedded in the slot of the closed U-shaped insulating plate 4 and flexibly presses the effective edge of the copper flat wire coil 2 located in the stator winding slot 10. The soft plug structure of the plug body 51 applies pressure flexibly when closing the slot, avoiding hard contact that could damage the coil and its surface insulation layer, while providing a lasting clamping force to ensure reliable coil fixation.

[0027] The insulating plug 5 also includes a plug head 52 fixedly connected to the plug head body 51, and the insulating plug 5 is fixed to the inner circle of the stator core of the stator 1 via the plug head 52. A fastener 6 is included, and the plug head 52 is fixedly connected to the inner circle of the stator core of the stator 1 via the fastener 6. Preferably, the fastener 6 is a locating pin that passes through the plug head 52 and extends into the stator 1, used to position the insulating plug 5 and prevent its circumferential and / or axial movement. The plug head 52 is anchored to the inner circle of the stator core by the locating pin, resisting centrifugal force and electromagnetic vibration, preventing the insulating plug 5 from loosening, and maintaining a tight clamping effect.

[0028] like Figure 2As shown, the copper flat wire coil 2 is covered with a multi-layer composite insulating sleeve. This multi-layer composite insulating sleeve, from the inside out, includes at least: a buffer insulating layer 7 with a corrugated or pleated structure; a continuous mica tape layer 8 covering the buffer insulating layer 7; and a dense encapsulating layer 9 adhered to the continuous mica tape layer 8. The dense encapsulating layer 9 is an epoxy resin impregnation layer or a polyesterimide varnish layer. The multi-layer composite insulating sleeve serves as secondary protection: the corrugated or pleated buffer insulating layer 7 absorbs thermal stress to prevent cracking, the continuous mica tape layer 8 blocks high-frequency corona discharge, and the dense encapsulating layer 9 isolates moisture contaminants.

[0029] In summary, the advantages of this utility model are: 1) Strong insulation protection: The U-shaped insulating plate and the insulating plug form an insulating cavity, eliminating electrical contact between the effective edge of the coil and the iron core and the environment, and preventing creepage and electrical short circuits; 2) Damage-proof clamping and fixing: The soft plug structure flexibly clamps the coil, avoiding insulation damage caused by traditional hard slot wedges, while suppressing axial movement; 3) Discharge prevention: The physical elastic deformation of the insulating paperboard fills the coil gap in real time, eliminating the hidden danger of air gap discharge; 4) Vibration resistance: The positioning pin anchors the insulating plug, ensuring that the clamping function does not fail under high centrifugal force.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. An insulation protection structure for stator slot coils of an electric motor, characterized in that: include: A copper flat wire coil (2) is inserted into the stator winding slot (10) and wound in a zigzag pattern on the stator (1). The portion of the copper flat wire coil (2) located in the stator winding slot (10) constitutes an effective side. An insulating partition (3) is clamped between adjacent copper flat wire coils (2) in the same slot; A U-shaped insulating plate (4) is embedded in the stator winding slot (10), and the slot opening of the U-shaped insulating plate (4) is aligned with the slot opening of the stator winding slot (10). An insulating plug (5) is located at the slot opening of the stator winding slot (10). The insulating plug (5) closes the slot opening of the U-shaped insulating plate (4) to insulate the effective side of the copper flat wire coil (2) from the U-shaped insulating plate (4). The plug head body (51) of the insulating plug (5) is embedded in the slot opening of the U-shaped insulating plate (4) and presses the effective side.

2. The motor stator slot coil insulation protection structure according to claim 1, characterized in that: The insulating partition (3) is an insulating paperboard, which fills the gap between adjacent copper flat wire coils (2) by elastic deformation generated when squeezed.

3. The motor stator slot coil insulation protection structure according to claim 1, characterized in that: The U-shaped insulating plate (4) is fixed by being embedded into the stator winding slot (10) through an interference fit.

4. The motor stator slot coil insulation protection structure according to claim 1, characterized in that: The plug body (51) of the insulating plug (5) is a soft plug structure, which is embedded in the slot of the closed U-shaped insulating plate (4) and flexibly presses the effective edge of the copper flat wire coil (2) located in the stator winding slot (10).

5. The motor stator slot coil insulation protection structure according to claim 1, characterized in that: The insulating plug (5) also includes a plug head (52) fixedly connected to the plug head body (51), and the insulating plug (5) is fixed to the inner circle of the stator core of the stator (1) through the plug head (52).

6. The motor stator slot coil insulation protection structure according to claim 5, characterized in that: Includes fasteners (6), the plug head (52) is fixedly connected to the inner circle of the stator core of the stator (1) by fasteners (6).

7. The motor stator slot coil insulation protection structure according to claim 6, characterized in that: The fastener (6) is a locating pin that passes through the head (52) of the plug and extends into the stator (1) to position the insulating plug (5) and prevent its circumferential and / or axial movement.

8. The motor stator slot coil insulation protection structure according to any one of claims 1 to 7, characterized in that: The copper flat wire coil (2) is covered with a multi-layer composite insulating sleeve, which, from the inside out, includes at least the following: A buffer insulation layer with a pleated or corrugated structure (7); A continuous mica tape layer (8) covering the buffer insulation layer (7); And a dense encapsulation layer (9) that adheres to the continuous mica tape layer (8), wherein the dense encapsulation layer (9) is an epoxy resin impregnation layer or a polyesterimide varnish layer.

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