Alternating current motor stator winding bevel edge fixing structure

Abstract

The utility model relates to a bevel edge fixing structure for a stator winding of an alternating current motor, develops a fixing structure made of materials such as a thermal expansion type glass mat, a polyester mat, an epoxy glass cloth plate cushion block and an oriented glass fiber tape, and belongs to the field of fixing of bevel edges of stator windings. The bevel edge of the end part of the stator coil is bound by a specific insulating material and then is connected and fixed into a whole, the stator coil does not transmit vibration after the stator end part is fixed by the stator coil, and the stator end part is in non-rigid connection with a motor stator base, so that the capability of insulating and resisting mechanical vibration of a stator winding is enhanced; meanwhile, the problems that the outer contour of a stator winding is large and the stator is difficult to assemble due to binding of a glass fiber reinforced plastic end hoop at a coil nose part at present are solved; the safety, the reliability and the service life of the motor in long-term operation are further improved.

Description

Technical Field:

[0001] The utility model relates to a fixing structure for the bevel edge of a stator winding of an AC motor, belonging to the field of fixing the bevel edge of a stator winding. Background Art:

[0002] During the long-term operation of an AC motor, the stator winding is affected by mechanical vibration force, electromagnetic force, temperature, and environmental factors, and thus phenomena such as loosening, displacement, wear, and cracking occur, resulting in accidents such as motor insulation breakdown and shutdown. In particular, the strong impact force caused by the electromagnetic force generated during motor startup or stator winding short circuit is more likely to cause damage to the motor winding. The probability of this damage occurring at the winding end is much higher than that at the slot part. Most of them are caused by unreasonable binding and fixing of the winding end.

[0003] Due to the limitation of the insulating material for binding and fixing, the shims for binding the stator winding end are made of hard laminate, and the gaps between the bevel edges of the winding coils are tightly filled. In the long-term operation of the motor, the shims are sometimes loose, or the main insulation of the end coils is worn or the shims jump out, all of which will cause motor operation accidents. There are no strengthening measures for the lead connection and phase-to-phase connection parts of the stator winding, and they often crack and "explode" due to stress. Therefore, the fixing process of the motor winding has attracted more and more attention, and the winding binding and fixing structure has been continuously improved.

[0004] In order to enable the motor to operate stably for a long time, the fixing structure of the bevel edge of its stator coil needs to have sufficient mechanical strength. Usually, after the stator coil is embedded in the stator core, it is called the stator winding. When the motor is running, especially during startup or load change, the end of the stator winding is subjected to a large electromagnetic force. If the stator coil is unevenly stressed, it is very easy to generate displacement or deformation, resulting in damage to the insulation of the stator coil. This phenomenon has a higher probability at the end of the stator winding. Therefore, the fixing of the bevel edge of the stator coil will directly affect the service life of the motor. For this reason, the fixing structure of the end of the motor stator winding is constantly being improved, and it is very necessary to study a simple, reliable, and well-fixed structure for the bevel edge of the motor winding. Summary of the Utility Model:

[0005] The purpose of the patent of the utility model is to provide a simple, reliable, and well-fixed structure for the bevel edge of the motor winding, enhance the ability of the stator winding insulation to resist mechanical vibration, and improve the safety of the motor during long-term operation.

[0006] The fixing structure for the bevel edge of the stator winding of an AC motor, the fixing structure for the bevel edge of the stator winding is divided into tangential fixing and diagonal fixing. The coils of the stator winding are fixedly connected into a whole through the end part, specifically by arranging pads on the stator winding coils, and the pads and the outer side of the stator winding coils are fixed by binding.

[0007] The utility model discloses a stator winding bevel fixing structure for an AC motor. The conventional fixing adopts a heat-expanding glass felt which is inserted into a gap. The height of the pad needs to exceed the insulation height of the coil by 3 mm. After VPI impregnation, the heat-expanding glass felt has an expansion rate of more than 50% at 145°C. After curing, the heat-expanding glass felt becomes a dumbbell shape, which effectively ensures the bevel gap of the coil.

[0008] The utility model discloses a stator winding bevel fixing structure for an AC motor, wherein the cushion block is a glass cloth plate cushion block wrapped with polyester felt.

[0009] The utility model discloses an alternating current motor stator winding oblique edge fixing structure. The diagonal fixing is specifically achieved by arranging pads between the gaps between the upper and lower edges of adjacent stator winding coils. The pads and the outer sides of the stator winding coils are fixed by cross-binding.

[0010] The utility model discloses an alternating current motor stator winding bevel fixing structure. The tangential fixing is specifically achieved by arranging a pad on a single stator winding coil, and the pad and the outer side of the stator winding coil are fixed by straight binding.

[0011] The utility model discloses a stator winding bevel fixing structure for an alternating current motor, wherein the binding is specifically fixed by adopting a directional glass fiber belt.

[0012] The utility model discloses a stator winding bevel fixing structure for an alternating current motor. After the cross-binding and fixing, the height of the pad is slightly smaller than the insulation height of the coil.

[0013] The utility model provides a simple, reliable and good fixing effect motor winding bevel fixing structure, which enhances the ability of the stator winding insulation to resist mechanical vibration, and overcomes the problem that the outer contour of the stator winding is larger and the stator is difficult to equip due to the current fiberglass end hoop binding of the coil nose, and further improves the safety, reliability and service life of the motor under long-term operation. Description of the drawings:

[0014] Figure 1 It is a schematic diagram of the fixing of the coil bevel cutting direction.

[0015] Figure 2 It is a schematic diagram of the diagonal fixing of the hypotenuse of the coil.

[0016] Figure 3 This is the normal fixing diagram of the coil bevel Figure 1 .

[0017] Figure 4 This is the normal fixing diagram of the coil bevel Figure 2 .

[0018] Figure 5 This is a schematic diagram of the straight-line fixing of the beveled edge of the coil.

[0019] Figure 6 It is a schematic diagram of cross-binding and fixing the bevel edge of the coil. Specific implementation method:

[0020] Example 1: As Figures 1-6 shown, for the bevel edge fixing structure of the stator winding of an AC motor, the coils of the stator winding are fixedly connected into a whole through the end parts. Specifically, pads are arranged on the coils of the stator winding, and the pads and the outer side of the stator winding coils are fixed by binding.

[0021] For a bevel edge fixing structure of the stator winding of an AC motor in the present utility model, the pads are made of heat-expansion type glass felt pads or polyester felt-wrapped glass cloth board pads.

[0022] For a bevel edge fixing structure of the stator winding of an AC motor in the present utility model, the diagonal fixing is specifically realized by arranging pads between the gaps of the upper and lower sides of adjacent stator winding coils, and the pads and the outer side of the stator winding coils are fixed by cross-binding.

[0023] For a bevel edge fixing structure of the stator winding of an AC motor in the present utility model, the tangential fixing is specifically realized by arranging pads on a single stator winding coil, and the pads and the outer side of the stator winding coils are fixed by one-way binding.

[0024] For a bevel edge fixing structure of the stator winding of an AC motor in the present utility model, the binding is specifically carried out by using a directional glass fiber tape for fixing.

[0025] For a bevel edge fixing structure of the stator winding of an AC motor in the present utility model, the height of the pad is slightly less than the insulation height of the coil after cross-binding and fixing.

[0026] Example 2: As Figures 1-6 shown, for the bevel edge fixing structure of the stator winding of an AC motor, the bevel edge fixing methods of the stator winding coils are divided into tangential fixing and diagonal fixing;

[0027] As Figure 1 and 2 shown, the stator coils are fixedly connected into a whole through the end parts. For ordinary fixing, heat-expansion type glass felt is stuffed into the gap. For cross-binding, heat-expansion type glass felt pads or polyester felt-wrapped glass cloth board pads are stuffed into the gap between the upper and lower sides, and then cross-bound and fixed with a directional glass fiber tape. The height of the pad in this fixing method is slightly less than the insulation height of the coil.

[0028] For the bevel edge fixing structure of the stator winding of an AC motor, for the gap between the upper and lower sides of the coil, for ordinary fixing, heat-expansion type glass felt is stuffed into the gap, and the height of the pad needs to exceed the insulation height of the coil by 3 mm;

[0029] As Figure 3and 4 As shown, when the heat-expandable glass mat is impregnated with VPI, the expansion rate reaches over 50% at 145°C. After curing, the heat-expandable glass mat becomes dumbbell-shaped, effectively ensuring the clearance of the coil bevel edge.

[0030] For the bevel edge fixing structure of the AC motor stator winding, for the clearance between the upper and lower sides of the coil, when using cross tying with heat-expandable glass mat pads or polyester felt-wrapped glass cloth board pads, they are inserted into the clearance between the upper and lower sides, and then fixed by cross-cross tying with oriented glass fiber tapes. The height of the pads in this fixing method is slightly less than the insulation height of the coil, as Figure 5 and 6 shown.

[0031] The non-rigid connection between the stator end and the motor stator frame enhances the ability of the stator winding insulation to resist mechanical vibration.

[0032] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0033] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Fixed structure for the bevel edge of the stator winding of an AC motor, characterized in that , The stator winding bevel fixing structure is divided into tangential fixing and diagonal fixing. The stator winding coils (1) are fixedly connected into a whole through end fixing. Specifically, pads (2) are arranged on the stator winding coils (1), and the pads (2) and the outer sides of the stator winding coils (1) are fixed by binding; The diagonal fixing is specifically realized by arranging pads (2) between the gaps of the upper and lower sides of adjacent stator winding coils (1), and the pads (2) and the outer sides of the stator winding coils (1) are fixed by cross binding; The tangential fixing is specifically realized by arranging pads (2) on a single stator winding coil (1), and the pads (2) and the outer sides of the stator winding coils (1) are fixed by linear binding.

2. The fixed structure of the hypotenuse of the stator winding of an AC motor according to claim 1, wherein The pad (2) is a heat-expansion type glass felt pad.

3. A fixing structure for the bevel edge of the stator winding of an AC motor according to claim 1, characterized in that, The pad (2) is a polyester felt wrapped glass cloth board pad.

4. A fixing structure for the bevel edge of a stator winding of an AC motor according to claim 1, characterized in that, The binding is specifically carried out by using a directional glass fiber tape for fixing.

5. A fixing structure for the bevel edge of a stator winding of an AC motor according to claim 4, characterized in that, After the cross binding is fixed, the height of the pad (2) is less than the insulation height of the stator winding coil (1).

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