Winding outgoing line structure of high-voltage concentrated winding motor

Abstract

The invention discloses a winding outgoing line structure of a high-voltage concentrated winding motor, and the structure comprises a winding which is of an annular structure, and the side part of the winding is of a U-shaped structure; the outgoing line is arranged in the middle of the U-shaped structure; and the insulating layer is sleeved on the peripheries of the winding and the outgoing line. According to the winding outgoing line structure of the high-voltage concentrated winding motor provided by the invention, the outgoing line is arranged in the middle of the side part of the winding, and the peripheries of the outgoing line and the winding are wrapped with the insulating layer, so that compared with the prior art, the arrangement mode of the outgoing line has the advantages that the distance between the outgoing line and the middle part of the winding is increased; therefore, the creepage distance of the root of the insulating layer on the surface of the outgoing line is increased, and the creepage breakdown phenomenon caused by the winding withstand voltage of the high-voltage concentrated winding motor is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of motor components, and more specifically to a high-voltage concentrated winding motor winding lead-out wire structure. Background Art

[0002] With the continuous improvement of the cost-effectiveness of rare earth permanent magnet material neodymium iron boron (NdFeB), permanent magnet motors have been rapidly developed in the fields of industrial drive and servo control systems with their significant advantages such as high efficiency, high power density, and good dynamic response characteristics. The characteristics of fractional slot concentrated windings, such as small end proportion, small phase mutual inductance, relatively large self-inductance, and asymmetric structural distribution, make it have many advantages such as low loss, high efficiency, high torque density, strong fault tolerance, good weak magnetic properties, small short-circuit current, small cogging torque, and excellent torque characteristics. It has broad application prospects in the fields of wind power generation, ship propulsion, and electric vehicles. Fractional slot concentrated winding permanent magnet synchronous motors are currently mostly used in the field of low-voltage motors. Based on the many advantages of fractional slot concentrated winding permanent magnet synchronous motors, concentrated windings are intended to be used in the field of high-voltage and low-speed direct drive motors.

[0003] Since the concentrated winding coil ends are shorter and the coil span is narrower, the electric field distribution at the winding ends changes significantly. With the common low-voltage concentrated winding lead wire wrapping method, the lead wire and the main insulation overlap distance is short, and it is difficult to ensure the sealing between the lead wire and the main insulation during the wrapping process, resulting in creepage breakdown during withstand voltage, which seriously affects the product quality and production efficiency.

[0004] The existing high-voltage concentrated winding lead-out wire structure generally follows the more mature low-voltage concentrated winding lead-out wire structure, that is, the winding lead-out wire is parallel to the straight line part of the winding (the straight line part can be directly formed on the winding mold, and the process is simple), and then the lead-out wire is fixed to the winding by using external insulation.

[0005] The existing high-voltage concentrated winding lead-out structure generally has the following two shortcomings:

[0006] 1) The relatively mature low-voltage concentrated winding lead-out structure is used, that is, the winding lead-out line is parallel to the straight part of the winding, and the lead-out position basically overlaps with the end position of the low-resistance band (the low-resistance band will contact the iron core and is the grounding point). Affected by the short structural characteristics of the concentrated winding end, the overlap distance between the winding lead-out insulation and the main insulation is only a part of the notch of the straight part of the winding (about 20mm, that is, the distance between the lead insulation root and the lead-out position, which is equivalent to the distance between the lead insulation root and the grounding point), which cannot meet the creepage distance design requirements. The high-voltage concentrated winding motor is prone to creepage breakdown during the voltage withstand test;

[0007] 2) Only external insulation is used to fix the lead wire on the winding. After wrapping the insulation, the shape of the lead wire is irregular. There is a large gap between the lead wire insulation and the main insulation. It is difficult to completely fill it after varnishing, resulting in poor overall insulation density. Creepage breakdown is prone to occur during the voltage withstand test of the high-voltage concentrated winding motor winding.

[0008] In summary, how to avoid creepage breakdown of high-voltage concentrated winding motor windings is a problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0009] In view of this, the purpose of the present invention is to provide a high-voltage concentrated winding motor winding lead-out wire structure, which can increase the distance between the lead-out wire position and the middle of the winding, improve the creepage distance of the insulation layer at the root of the lead-out wire, and avoid creepage breakdown.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] A high-voltage concentrated winding motor winding lead-out wire structure, comprising:

[0012] The winding is a ring-shaped structure, and the side of the winding is a U-shaped structure;

[0013] A lead-out line is arranged in the middle of the U-shaped structure;

[0014] The insulating layer is sleeved on the outer circumference of the winding and the lead wire.

[0015] Preferably, the lead wire comprises a lead wire head and a lead wire tail, and the lead wire head and the lead wire tail are respectively arranged on both sides of the middle part of the U-shaped structure.

[0016] Preferably, two straight portions are provided between two side portions of the winding, and the insulating layer comprises a high-resistance band and a low-resistance band, the high-resistance band is sleeved on the side portion of the winding, and the low-resistance band is sleeved on the straight portion of the winding.

[0017] Preferably, the insulating layer further comprises a lead wire insulating layer, the lead wire insulating layer is sleeved on the outer circumference of the lead wire, the lead wire insulating layer is overlapped with the high resistance band, and the high resistance band is overlapped with the low resistance band.

[0018] Preferably, the two straight line portions and the lead-out line are arranged parallel to each other.

[0019] Preferably, the high-resistance band includes two main insulating layers, and the two main insulating layers are respectively arranged on both sides of the lead-out line.

[0020] Preferably, the lead wire and the winding are an integrated structure.

[0021] Preferably, the insulating layer is formed by winding a mica tape, and the starting point of the mica tape is arranged at the connection between the lead wire and the winding.

[0022] Preferably, a digital display detection component is also provided on the surface of the insulating layer, and the digital display detection component is used to detect the voltage on the surface of the insulating layer.

[0023] Preferably, it also includes an alarm component, which is electrically connected to the digital display detection component, and the alarm component is used to issue an alarm when the digital display detection component reaches a preset value.

[0024] The present invention provides a lead-out wire structure for a high-voltage concentrated winding motor winding, in which the lead-out wire of the structure extends outward from the middle of the winding side, and an insulating layer is wrapped around the lead-out wire and the outer periphery of the winding. Compared with the prior art, the lead-out wire is arranged in a manner that increases the distance between the lead-out wire and the middle of the winding, thereby increasing the creepage distance of the root of the insulating layer on the surface of the lead-out wire, thereby avoiding creepage breakdown of the high-voltage concentrated winding motor winding withstand voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the structure of the lead-out wire structure of the high-voltage concentrated winding motor provided by the present invention;

[0027] Figure 2 This is a structural schematic diagram of the high-voltage concentrated winding motor winding lead-out wire structure provided by the present invention from another perspective.

[0028] Reference numerals:

[0029] 1-winding; 2-lead wire; 201-lead wire head; 202-lead wire tail; 3-insulating layer; 301-high resistance band; 302-low resistance band; 303-lead wire insulation layer. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The core of the present invention is to provide a high-voltage concentrated winding motor winding lead-out wire structure, which can increase the distance between the lead-out wire position and the middle section of the winding, and improve the creepage distance of the insulation layer at the root of the lead-out wire compared to the prior art, thereby avoiding creepage breakdown.

[0032] It should be noted that the directions or positional relationships indicated by “upper”, “lower”, “front”, “back”, etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0033] The present application provides a high-voltage concentrated winding motor winding lead-out wire structure, comprising: a winding 1, a lead-out wire 2 and an insulating layer 3;

[0034] Wherein, the winding 1 is a ring structure, and the side of the winding 1 is a U-shaped structure;

[0035] The lead wire 2 is arranged in the middle of the U-shaped structure;

[0036] The insulating layer 3 is sleeved on the outer circumference of the winding 1 and the lead wire 2 .

[0037] For details, please refer to the attached Figure 2 The winding 1 is a ring structure, divided into two side parts and two middle parts. The side part of the winding 1 is a U-shaped structure. A lead wire 2 is arranged in the middle part of the U-shaped structure. The lead wire 2 and the U-shaped structure are combined to form a Y-shaped structure. The lead wire 2 and the winding 1 can be fixed through the insulating layer 3. Compared with the prior art, the design scheme in which the lead wire 2 is arranged in the middle of the U-shaped structure increases the distance between the connection part between the lead wire 2 and the winding 1 and the middle part of the winding 1, thereby improving the creepage distance at the root of the insulation layer of the lead wire 2.

[0038] On the basis of the above embodiment, the lead wire 2 includes a lead wire head 201 and a lead wire tail 202 , and the lead wire head 201 and the lead wire tail 202 are respectively arranged on both sides of the middle of the U-shaped structure.

[0039] For details, please refer to the attached Figure 1 The lead wire 2 is a U-shaped structure, the middle part of which is arranged in the inner ring of the winding 1 and is conformed to the U-shaped structure on the side of the winding 1 and fits on the inner wall of the U-shaped structure. The lead wire head 201 and the lead wire tail 202 are both extended toward the outside of the winding 1. The lead wire head 201, the winding 1 and the lead wire tail 202 are combined to realize current transmission.

[0040] In some embodiments, two straight portions are provided between two sides of the winding 1 , and the insulating layer 3 includes a high resistance band 301 and a low resistance band 302 . The high resistance band 301 is sleeved on the side of the winding 1 , and the low resistance band 302 is sleeved on the straight portion of the winding 1 .

[0041] Specifically, two identical straight parts are arranged between the two U-shaped side parts of the winding 1, a low-resistance belt 302 is arranged on the outer periphery of the straight part, and a high-resistance belt 301 is arranged on the outer periphery of the U-shaped structure of the side part. The arrangement of the low-resistance belt 302 and the high-resistance belt 301 can prevent leakage and ensure the normal use of the winding 1. The high-resistance belt 301 is usually made of an alkali-free glass fiber belt impregnated with semiconductor high-resistance paint and is used for the end of the winding 1. The field strength at the core slot position and the end of the winding is stronger than that at the straight edge position, and corona is easily formed at these positions. Therefore, the high-resistance belt 301 is required to prevent corona damage to the winding 1. The low-resistance belt 302 mainly includes an iron-containing asbestos belt and an alkali-free glass fiber belt impregnated with semiconductor low-resistance paint, and is used for the wire rod and wire slot part, that is, the straight edge of the winding 1. The high-resistance belt 301 is overlapped at the transition intersection between the straight edge and the end to achieve uniform distribution of potential and prevent corona.

[0042] Based on the above embodiment, the insulating layer 3 also includes a lead wire insulating layer 303, which is sleeved on the outer periphery of the lead wire 2, and the lead wire insulating layer 303 is overlapped with the high resistance band 301, and the high resistance band 301 is overlapped with the low resistance band 302.

[0043] Specifically, a lead wire insulation layer 303 is provided on the outer periphery of the lead wire 2, and the lead wire 2 appears at the side vertex of the winding 1, which increases the overlapping distance between the lead wire insulation layer 303 and the high resistance band 301, that is, increases the distance between the root of the lead wire insulation layer 303 and the lead wire outlet position of the lead wire 2, and at the same time, the change in the position of the lead wire 2 increases the distance between the lead wire outlet position and the low resistance band 302. The increase in the above two distances can both increase the creepage distance at the root of the lead wire insulation layer 303.

[0044] On the basis of the above embodiment, the two straight line portions and the lead wire 2 are arranged parallel to each other.

[0045] Specifically, the two straight portions are arranged in parallel to ensure regular distribution of field strength. The overall structure is simple and easy to manufacture. The lead wire 2 is conformally arranged to the side of the winding 1 so that the lead wire 2 is arranged in parallel to the two straight portions, which facilitates the arrangement of the insulating layer 3.

[0046] On the basis of the above-mentioned embodiment, the high-resistance band 301 includes two main insulating layers, and the two main insulating layers are respectively arranged on both sides of the lead-out line 2 .

[0047] Specifically, the main insulating layer near the high-resistance band 301 is divided into an upper and lower part according to the position of the lead wire 2. During the insulation layer wrapping process, the upper and lower parts of the main insulating layer can be wrapped separately. After the upper and lower parts of the main insulating layer are wrapped, the lead wire insulation layer 303 can be wrapped to increase the overlap distance.

[0048] On the basis of the above-mentioned embodiment, the lead wire 2 and the winding 1 are an integrated structure.

[0049] Specifically, the lead wire 2 should be arranged conformally to the side of the winding 1 , and an integrated arrangement can also be adopted to improve the stability of the structure, which can also reduce the difficulty of wrapping the insulating layer 3 .

[0050] On the basis of the above-mentioned embodiment, the insulating layer 3 is formed by winding a mica tape, and the starting point of the mica tape is set at the connection between the lead wire 2 and the winding 1 .

[0051] Specifically, for the wrapping of the insulating layer 3, generally speaking, under the premise of ensuring the overlap rate of the coil in the middle part of the winding 1, some layers of the main insulating mica tape need to be filled and wrapped layer by layer from the root of the lead wire below the lead wire 2 to strengthen the insulation at the root of the lead wire and fill the gap at the root of the lead wire. The remaining layers of the main insulating mica tape are wrapped as a whole above the lead wire 2 until the highest point of the coil axial direction, at the point where the lead wire 2 is separated from the wire turn, and the lead wire 2 and the wire turn are tied as a whole. This wrapping method will fill the gap at the root of the lead wire and the gap between the lead wire insulation layer 303 and the main insulation as much as possible to reduce the creepage clearance and increase the creepage breakdown voltage.

[0052] Optionally, after the winding 1 and the lead wire 2 are stacked with mica tape, the winding gaps and micropores can be filled with insulating varnish. After the insulating varnish is cured, a continuous and smooth paint film can be formed on the surface of the impregnated object, bonding it into a hard whole. The types of insulating varnish include silicone, diphenyl ether, polyimide, polyesterimide, epoxy resin and unsaturated polyester.

[0053] On the basis of the above embodiment, a digital display detection component is further provided on the surface of the insulating layer 3 , and the digital display detection component is used to detect the voltage on the surface of the insulating layer 3 .

[0054] Specifically, the creepage breakdown voltage of the insulating layer 3 can be detected through a standard leakage test. The standard leakage test is a common creepage distance test method, which uses standardized test equipment and procedures to simulate the breakdown situation under actual working conditions. Generally speaking, a digital multimeter can be used as a digital display detection component to detect basic electrical parameters such as voltage and current of the insulating layer 3. When the corresponding parameter reaches the preset value, it is regarded as leakage of the insulating layer.

[0055] Based on the above embodiment, it also includes an alarm component, which is electrically connected to the digital display detection component, and the alarm component is used to issue an alarm when the digital display detection component reaches a preset value.

[0056] Specifically, the alarm component generally uses an audible and visual alarm component. By electrically connecting the alarm component to the digital display detection component, when leakage of the insulation layer 3 is detected, that is, the insulation capacity of the insulation layer 3 does not meet the standard, the audible and visual alarm component will sound an alarm to warn the operator that the winding 1 and the insulation layer 3 need to be inspected.

[0057] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0058] The above is a detailed introduction to the high-voltage concentrated winding motor winding lead wire structure provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A high-voltage concentrated winding motor winding lead-out structure, characterized in that: include: The winding (1) is a ring-shaped structure, and the side of the winding (1) is a U-shaped structure; A lead wire (2) is arranged in the middle of the U-shaped structure; An insulating layer (3) is sleeved on the outer circumference of the winding (1) and the lead wire (2).

2. The high-voltage concentrated winding motor winding lead-out structure according to claim 1, characterized in that: The lead wire (2) comprises a lead wire head (201) and a lead wire tail (202), and the lead wire head (201) and the lead wire tail (202) are respectively arranged on two sides of the middle part of the U-shaped structure.

3. The high-voltage concentrated winding motor winding lead-out structure according to claim 1, characterized in that: Two straight sections are provided between two side sections of the winding (1); the insulating layer (3) comprises a high resistance band (301) and a low resistance band (302); the high resistance band (301) is sleeved on the side section of the winding (1); and the low resistance band (302) is sleeved on the straight section of the winding (1).

4. The high-voltage concentrated winding motor winding lead-out structure according to claim 3, characterized in that: The insulating layer (3) further comprises a lead wire insulating layer (303), wherein the lead wire insulating layer (303) is sleeved on the outer periphery of the lead wire (2), the lead wire insulating layer (303) is overlapped with the high resistance band (301), and the high resistance band (301) is overlapped with the low resistance band (302).

5. The high-voltage concentrated winding motor winding lead-out structure according to claim 4, characterized in that: The two straight line portions and the lead wire (2) are arranged parallel to each other.

6. The high-voltage concentrated winding motor winding lead-out structure according to claim 5, characterized in that: The high resistance band (301) comprises two main insulating layers, and the two main insulating layers are respectively arranged on both sides of the lead-out line (2).

7. The high-voltage concentrated winding motor winding lead-out structure according to any one of claims 1 to 6, characterized in that: The lead wire (2) and the winding (1) are an integrated structure.

8. The high-voltage concentrated winding motor winding lead-out structure according to claim 7, characterized in that: The insulating layer (3) is formed by winding a mica tape, and the starting point of the mica tape is arranged at the connection point between the lead wire (2) and the winding (1).

9. The high-voltage concentrated winding motor winding lead-out structure according to claim 8, characterized in that: A digital display detection component is also provided on the surface of the insulating layer (3), and the digital display detection component is used to detect the voltage on the surface of the insulating layer (3).

10. The high-voltage concentrated winding motor winding lead-out wire structure according to claim 9, characterized in that: It also includes an alarm component, which is electrically connected to the digital display detection component and is used to issue an alarm when the digital display detection component reaches a preset value.

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