Stator assembly and motor

Abstract

The utility model provides a stator assembly and a motor, and relates to the technical field of high-voltage motors. The stator assembly comprises a stator core and a winding wire; the stator core is provided with a plurality of stator slots, the stator slots are arranged on the outer side wall and the inner side wall of the stator core in pairs and are distributed along the circumferential direction of the stator core, a plurality of turns of winding wires are arranged in each stator slot in a penetrating manner, and each turn of winding wire is coated with a turn-to-turn insulating layer. In the stator assembly, a plurality of turns of winding wires are arranged in each stator slot in a penetrating manner to form a back winding type scattered wire winding. And meanwhile, each turn of winding wire is coated with the turn-to-turn insulating layer, so that high voltage can be withstood, and the insulation requirement of the high-voltage motor can be met. In the winding process, the winding wire has better flexibility and is easier to bend, so that the sizes of the windings at the two ends of the stator iron core are smaller than those of the formed windings, the occupied space is reduced, the length of the high-voltage motor can be shortened, and the high-voltage motor can achieve higher power and rotating speed.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage motors, in particular to a stator assembly and a motor. Background Art

[0002] Existing high-voltage motors (usually motors with a rated voltage greater than 1000V) often use formed windings. The windings are made of flat wires, and each coil is pre-formed and inserted into an open or semi-open stator slot from the slot.

[0003] The characteristic of the formed winding is that the shape is basically fixed, which causes the end winding to be too large and incompressible, and requires a large end space, so that the high-voltage motor needs to be made very long, limiting the power and speed of the high-voltage motor. Utility Model Content

[0004] In order to solve the problems of oversized end windings, limited power and rotation speed in existing high-voltage motors, one of the purposes of the utility model is to provide a stator assembly.

[0005] The utility model provides the following technical solutions:

[0006] A stator assembly comprises a stator core and a winding wire;

[0007] The stator core is provided with a plurality of stator slots, which are arranged in pairs on the outer wall and the inner wall of the stator core and distributed along the circumference of the stator core. A plurality of turns of the winding wire are passed through each of the stator slots, and each turn of the winding wire is covered with an inter-turn insulation layer.

[0008] As a further optional solution for the stator assembly, the stator slots are filled with an impregnation varnish layer, and the impregnation varnish layer wraps the winding wire.

[0009] As a further optional solution for the stator assembly, multiple layers of insulating felt are arranged in the stator slots, the multiple layers of insulating felt are distributed along the depth direction of the stator slots, and the winding wire is located between two adjacent layers of the insulating felt.

[0010] As a further optional solution for the stator assembly, a slot wedge is provided in the stator slot, the slot wedge is engaged with the inner wall of the stator slot, and the slot wedge is located on the side of the winding wire facing the slot opening of the stator slot.

[0011] As a further optional solution for the stator assembly, an expansion felt is provided in the stator slot, and the slot wedge is supported against the winding wire through the expansion felt.

[0012] As a further optional solution for the stator assembly, a slot insulation layer is provided in the stator slot, and the slot insulation layer is in contact with the inner wall of the stator slot.

[0013] As a further optional solution to the stator assembly, the cross-section of the winding wire is rectangular or hexagonal;

[0014] The bottom surface of the stator slot is a plane, or the stator slot has two side walls parallel to each other.

[0015] Another object of the utility model is to provide a motor.

[0016] The utility model provides the following technical solutions:

[0017] A motor comprises the above-mentioned stator assembly.

[0018] As a further optional solution for the motor, the motor further includes a casing, the casing is sleeved on the stator core, and an inner side wall of the casing is provided with grooves corresponding to the stator slots on the outer side wall of the stator core.

[0019] As a further optional solution for the motor, the motor also includes a pressure plate and a pull rod, the pressure plates are arranged in pairs at both ends of the stator core along the axial direction, the pull rod passes through the stator core and the pressure plate, and insulating sleeves are arranged between the pull rod and the stator core and between the pull rod and the pressure plate.

[0020] The embodiments of the present invention have the following beneficial effects:

[0021] In the above-mentioned stator assembly, the stator slots are arranged in pairs on the outer wall and the inner wall of the stator core to facilitate winding. On this basis, multiple turns of winding wire are passed through each stator slot to form a back-wound loose wire winding. At the same time, each turn of the winding wire is coated with an inter-turn insulation layer, which can withstand high voltage to meet the insulation requirements of high-voltage motors. During the winding process, the winding wire has better flexibility and is easier to bend, so that the size of the winding at both ends of the stator core is smaller than that of the formed winding, which reduces the occupied space and is conducive to shortening the length of the high-voltage motor, so that the high-voltage motor can achieve higher power and speed.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 The overall structural diagram of a stator assembly provided by an embodiment of the utility model is shown;

[0025] Figure 2 A partial structural schematic diagram of a stator assembly provided by an embodiment of the utility model is shown;

[0026] Figure 3 A partial structural schematic diagram of a motor provided by an embodiment of the utility model is shown;

[0027] Figure 4 A partial structural schematic diagram of a motor provided by an embodiment of the utility model is shown.

[0028] Description of main component symbols:

[0029] 100- stator assembly; 110- stator core; 111- stator slot; 111a- bottom surface; 111b- side wall; 112- impregnation varnish layer; 113- insulating felt; 114- slot wedge; 115- expansion felt; 116- slot insulation layer; 117- pull rod hole; 120- winding wire; 121- inter-turn insulation layer; 200- housing; 210- groove. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the template herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0035] Example

[0036] Please also read Figure 1 and Figure 2 This embodiment provides a stator assembly 100, which is applied to a motor, especially a high-voltage motor. The stator assembly 100 is composed of a stator core 110 and a winding wire 120.

[0037] The stator core 110 is provided with a plurality of stator slots 111, and the stator slots 111 are arranged in pairs on the outer wall and the inner wall of the stator core 110. The stator slots 111 penetrate the stator core 110 in a direction parallel to the axis of the stator core 110, and the plurality of stator slots 111 are distributed along the circumferential direction of the stator core 110. In addition, a plurality of turns of winding wire 120 are passed through each stator slot 111, and each turn of winding wire 120 is coated with an inter-turn insulation layer 121.

[0038] Among them, the stator slots 111 are arranged in pairs on the outer wall and the inner wall of the stator core 110, which means that the number of stator slots 111 located on the outer wall of the stator core 110 is the same as the number of stator slots 111 located on the inner wall of the stator core 110, and the stator slots 111 located on the outer wall of the stator core 110 are aligned with the corresponding stator slots 111 located on the inner wall of the stator core 110 along the radial direction of the stator core 110.

[0039] In addition, a single or multiple winding wires 120 are alternately and repeatedly wound in the stator slots 111 located on the outer wall of the stator core 110 and the corresponding stator slots 111 located on the inner wall of the stator core 110 , thereby forming multiple turns of winding wire 120 in each stator slot 111 .

[0040] At this time, the arrangement of the winding wire 120 in the stator slot 111 located on the outer wall of the stator core 110 is the same as the arrangement direction of the winding wire 120 in the stator slot 111 located on the inner wall of the stator core 110. This embodiment takes the stator slot 111 located on the outer wall of the stator core 110 as an example for explanation.

[0041] In the above-mentioned stator assembly 100, the stator slots 111 are arranged in pairs on the outer wall and the inner wall of the stator core 110 to facilitate winding. On this basis, each stator slot 111 is penetrated with a plurality of turns of winding wire 120 to form a back-wound loose wire winding. At the same time, each turn of winding wire 120 is coated with an inter-turn insulation layer 121, which can withstand high voltage to meet the insulation requirements of high-voltage motors. During the winding process, the winding wire 120 has better flexibility and is easier to bend, so that the size of the winding at both ends of the stator core 110 is smaller than that of the formed winding, which reduces the occupied space and is conducive to shortening the length of the high-voltage motor, so that the high-voltage motor can achieve higher power and speed.

[0042] In some embodiments, each turn of the winding wire 120 includes multiple strands of enameled wire, and the multiple strands of enameled wire are fixed together by an inter-turn insulation layer 121 wrapped outside to form a single turn of the winding wire 120 .

[0043] Optionally, the enameled wire is a self-adhesive enameled wire, or a Litz wire is used to facilitate molding.

[0044] In addition, the inter-turn insulating layer 121 is wound with insulating materials such as glass fiber.

[0045] In some specific embodiments, the winding wire 120 has a circular cross-section.

[0046] Accordingly, the stator slot 111 has a bottom surface 111 a and two opposite side walls 111 b .

[0047] The bottom surface 111a of the stator slot 111 is arc-shaped. The two side walls 111b are spaced farther apart at one end near the middle of the stator core 110 and are connected to the bottom surface 111a respectively. The two side walls 111b are spaced farther apart at one end away from the middle of the stator core 110, forming a relatively narrow slot.

[0048] In some other specific embodiments, the cross-section of the winding wire 120 is rectangular or hexagonal.

[0049] Accordingly, the bottom surface 111a of the stator slot 111 is a plane, or the two side walls 111b of the stator slot 111 are parallel to each other. At this time, each turn of the winding wire 120 is in close contact with each other, and the air gap is smaller, thereby reducing partial discharge.

[0050] In some embodiments, the stator slots 111 are filled with an impregnation varnish layer 112 , and the impregnation varnish layer 112 wraps the winding wire 120 .

[0051] During assembly, the stator core 110 is dipped in varnish after the winding wire 120 is inserted. After the dip varnish is cured, a dip varnish layer 112 is formed and the winding wire 120 is wrapped. This can further enhance the insulation between each turn of the winding wire 120, so that the winding wire 120 can withstand higher voltages and better meet the insulation requirements of high-voltage motors.

[0052] Furthermore, multiple layers of insulating felt 113 are arranged in the stator slot 111 and are distributed along the depth direction of the stator slot 111. Accordingly, the winding wire 120 is located between two adjacent layers of insulating felt 113, and the multiple turns of winding wire 120 are divided into several layers by the insulating felt 113.

[0053] After the varnishing treatment, the insulating felt 113 can keep the varnish as much as possible in the stator slot 111, making the insulation more reliable.

[0054] Exemplarily, three layers of insulating felt 113 are arranged in the stator slot 111, dividing the multi-turn winding wire 120 into four layers, wherein the number of the first layer of winding wires 120 is two, the number of the second layer of winding wires 120 is three, the number of the third layer of winding wires 120 is three, and the number of the fourth layer of winding wires 120 is two.

[0055] Furthermore, a slot wedge 114 is disposed in the stator slot 111 . The slot wedge 114 is engaged with the inner wall of the stator slot 111 , and the slot wedge 114 is located on the side of the winding wire 120 facing the slot opening of the stator slot 111 .

[0056] During assembly, the winding wire 120 is first inserted into the stator slot 111 , and then the slot wedge 114 is inserted into the stator slot 111 along the axial direction of the stator core 110 , so as to prevent the winding wire 120 from escaping from the stator slot 111 .

[0057] In some specific embodiments, an expansion felt 115 is further disposed in the stator slot 111 , and the slot wedge 114 is supported against the winding wire 120 by the expansion felt 115 .

[0058] During the assembly process, after all the winding wires 120 are inserted into the stator slots 111, the slot wedges 114 and the expansion felt 115 are used to compress the winding wires 120, and then the winding wires 120 are dipped in paint. The expansion felt 115 will expand after being dipped in paint, so that each turn of the winding wire 120 is in close contact, reducing the air gap between each turn of the winding wire 120, thereby reducing partial discharge.

[0059] Furthermore, a slot insulation layer 116 is provided in the stator slot 111 , and the slot insulation layer 116 is in contact with the inner wall of the stator slot 111 .

[0060] When used, the slot insulation layer 116 can enhance the insulation between the winding wire 120 and the stator core 110 .

[0061] In summary, the above-mentioned stator assembly 100 cancels the traditional formed winding, and instead uses multiple turns of winding wire 120 to form a back-wound loose wire winding, and covers each turn of winding wire 120 with an inter-turn insulation layer 121 to meet the insulation requirements of the high-voltage motor.

[0062] During the winding process, the winding wire 120 has better flexibility and is easier to bend, so that the winding size at both ends of the stator core 110 is smaller than the formed winding, reducing the occupied space and facilitating shortening the length of the high-voltage motor, thereby enabling the high-voltage motor to achieve higher power and speed.

[0063] In addition, the stator core 110 after the winding wire 120 is inserted is varnished to form an impregnated varnish layer 112 in the stator slot 111, and an insulating felt 113 and a slot insulation layer 116 are arranged in the stator slot 111, and the winding wire 120 is compressed by slot wedges 114 and expansion felt 115 to reduce the air gap between each turn of the winding wire 120, which can enhance the insulation of the above-mentioned stator assembly 100, so that the above-mentioned stator assembly 100 can withstand higher voltages and better meet the insulation requirements of high-voltage motors.

[0064] Please also read Figure 3 and Figure 4 This embodiment also provides a motor, specifically a scattered wire winding back-wound high-voltage motor, which includes the above-mentioned stator assembly 100.

[0065] In some embodiments, the motor further includes a housing 200 . The housing 200 is sleeved outside the stator core 110 , and the outer wall of the stator core 110 is in close contact with the inner wall of the housing 200 .

[0066] In addition, the inner wall of the housing 200 is provided with a groove 210 corresponding to the stator slot 111 of the outer wall of the stator core 110. The groove 210 extends along the axis of the housing 200, and the groove 210 and the corresponding stator slot 111 are aligned along the radial direction of the housing 200.

[0067] When in use, the groove 210 disposed on the housing 200 can reduce eddy current losses caused by magnetic leakage from the stator slots 111 located on the outer wall of the stator core 110 .

[0068] Optionally, the cross section of the groove 210 is semicircular, and the slot width of the groove 210 is greater than the slot width of the stator slot 111 .

[0069] Optionally, the housing 200 is made of a non-magnetic metal material.

[0070] In some embodiments, the motor further includes a pressure plate and a pull rod.

[0071] The pressure plates are parallel to the end surfaces of the stator core 110 , and are arranged in pairs at two ends of the stator core 110 along the axial direction.

[0072] The tie rod is parallel to the axis of the stator core 110 and is inserted through the stator core 110 and the pressure plate. The stator core 110 is provided with a tie rod hole 117 for the tie rod to pass through. The two ends of the tie rod are respectively provided with threaded parts, and the threaded parts are sleeved with fastening nuts, and the fastening nuts are against the side of the pressure plate facing away from the stator core 110.

[0073] When in use, screw in the fastening nut and use the pull rod to tighten the pressure plates at both ends of the motor.

[0074] In addition, insulating sleeves are provided between the pull rod and the stator core 110 and between the pull rod and the pressure plate, so that the pull rod is insulated not only from the stator core 110 but also from the pressure plate to reduce eddy current loss.

[0075] During assembly, the insulating sleeve is firstly sleeved on the pull rod, and then the pull rod and the insulating sleeve are passed through the stator core 110 and the pressure plate together.

[0076] In summary, the motor adopts the aforementioned stator assembly 100, which has a shortened length, can achieve higher power and rotation speed, and has the advantage of low eddy current loss.

[0077] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0078] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0079] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A stator assembly, characterized in that: including a stator core and winding wires; The stator core is provided with a plurality of stator slots, which are arranged in pairs on the outer wall and the inner wall of the stator core and distributed along the circumference of the stator core. A plurality of turns of the winding wire are passed through each of the stator slots, and each turn of the winding wire is covered with an inter-turn insulation layer.

2. The stator assembly according to claim 1, characterized in that The stator slots are filled with an impregnation varnish layer, and the impregnation varnish layer wraps the winding wire.

3. The stator assembly according to claim 2, characterized in that: Multiple layers of insulating felt are arranged in the stator slots. The multiple layers of insulating felt are distributed along the depth direction of the stator slots. The winding wire is located between two adjacent layers of the insulating felt.

4. The stator assembly according to claim 2, characterized in that: A slot wedge is arranged in the stator slot, the slot wedge is engaged with the inner wall of the stator slot, and the slot wedge is located on the side of the winding wire facing the slot opening of the stator slot.

5. The stator assembly according to claim 4, characterized in that: An expansion felt is arranged in the stator slot, and the slot wedge is supported against the winding wire through the expansion felt.

6. The stator assembly according to any one of claims 1 to 5, characterized in that: A slot insulation layer is arranged in the stator slot, and the slot insulation layer is in contact with the inner wall of the stator slot.

7. The stator assembly according to any one of claims 1 to 5, characterized in that: The cross section of the winding wire is rectangular or hexagonal; The bottom surface of the stator slot is a plane, or the stator slot has two side walls parallel to each other.

8. A motor, characterized in that: The invention comprises the stator assembly according to any one of claims 1 to 7.

9. The motor according to claim 8, characterized in that The motor further comprises a casing, wherein the casing is sleeved on the stator core, and an inner side wall of the casing is provided with grooves corresponding to the stator slots on the outer side wall of the stator core.

10. The motor according to claim 8, characterized in that The motor also includes a pressure plate and a pull rod, wherein the pressure plates are arranged in pairs at both ends of the stator core along the axial direction, the pull rod passes through the stator core and the pressure plate, and insulating sleeves are arranged between the pull rod and the stator core and between the pull rod and the pressure plate.

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