Stator core, motor stator, motor and electronic oil pump

Abstract

The utility model discloses a stator core, a motor stator, a motor and an electronic oil pump, the surface of the stator core is provided with a coating protective layer, and the coating protective layer is arranged at the contact surface of the stator core and an enameled wire so as to form an insulation partition between the stator core and the enameled wire. According to the utility model, the surface of the stator core is coated with the protective layer as the insulating layer, and the insulating layer is used for directly isolating the stator core from the enameled wire, so that an upper wire frame and a lower wire frame can be omitted, the winding operation is simplified, the number of parts is reduced, the assembly difficulty is reduced, the cost is reduced, and the slot fullness rate of the stator is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a stator core, a motor stator, a motor and an electronic oil pump. Background Art

[0002] The stator core of the motor needs to be insulated from the enameled wire in the motor. In the existing technology, the upper and lower wire racks are used as insulators for the enameled wire and the stator core, and the three-phase terminals are used as electrical connections. However, this type of insulation isolation has defects such as complex winding, low stator slot fill rate, and complex assembly process due to many parts. Therefore, it is necessary to provide a new insulation isolation structure to isolate the stator core and the enameled wire.

[0003] In view of this, this patent application is filed. Utility Model Content

[0004] The utility model aims to provide a stator core, a motor stator, a motor and an electronic oil pump, which utilize a protective coating layer to insulate and isolate the enameled wire and the stator core, thereby solving the technical problems of complex winding, low stator slot fill rate and complex assembly process in the current use of a wire rack to insulate and isolate the stator core and the enameled wire.

[0005] The utility model is realized by the following technical solutions:

[0006] The first object of the utility model is to provide a stator core, wherein the surface of the stator core is provided with a coating protective layer, and the coating protective layer is arranged at the contact surface between the stator core and the enameled wire to form an insulating partition between the stator core and the enameled wire.

[0007] In an optional embodiment, the coating protective layer is arranged on all exposed surfaces of the stator core.

[0008] In an optional embodiment, the coating protective layer is a paint film layer.

[0009] In an optional embodiment, the paint film layer is any one of a polyesterimide layer, a polyimide layer, a polyester layer, or a composite layer of polyesterimide and polyamideimide.

[0010] In an optional embodiment, the coating protective layer has a thickness of 10 to 20 microns.

[0011] The second object of the present utility model is to provide a motor stator, comprising a stator core as described in any one of the above items.

[0012] In an optional embodiment, it further includes enameled wire, which includes a copper busbar and an insulating layer, the insulating layer covers the copper busbar, the copper busbar and the insulating layer form an insulating winding, and the insulating winding of the enameled wire is wound and fits the stator core.

[0013] The third object of the present utility model is to provide a motor, comprising a stator core as described in any one of the above items or a motor stator as described in any one of the above items.

[0014] In an optional embodiment, a motor assembly is further included, which includes a hollow shaft, a rotor core, a magnet and a magnetic ring, the two ends of the hollow shaft are respectively matched with the stator core and the rotor core, the magnet is matched with the rotor core, and the magnetic ring is matched and connected with the magnet.

[0015] The fourth object of the utility model is to provide an electronic oil pump, comprising a motor as described in any of the above items, and also comprising a casing sealing ring, a pump cover sealing ring, a pump cover, an inner rotor, an outer rotor, a casing, a motor assembly, an upper cover sealing ring, an upper cover assembly, a PCBA board, and an upper cover, wherein the PCBA board is provided with a paint film coating.

[0016] The advantages and beneficial effects of the utility model compared to the prior art are:

[0017] The utility model designs and coats a protective layer on the surface of the stator core as an insulating layer, and utilizes the insulating layer to directly isolate the stator core and the enameled wire, so that an upper wire rack and a lower wire rack can be eliminated, the winding operation is simplified, parts are reduced, the assembly difficulty is reduced, the cost is reduced, and the stator slot fill rate is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present utility model, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present 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 creative work. In the drawings:

[0019] Figure 1 The diagram is a schematic diagram of the exploded structure of a motor in an existing electronic oil pump.

[0020] Figure 2 The present invention is a schematic diagram of an exploded structure of a motor provided in one embodiment of the present invention.

[0021] Figure 3 A schematic diagram of the explosion structure of an electronic oil pump provided in one embodiment of the utility model.

[0022] Figure 4A schematic diagram of the exploded structure of an upper cover assembly on an electronic oil pump provided in one embodiment of the utility model.

[0023] Marks and corresponding parts names in the attached drawings:

[0024] 1- housing seal ring; 2- pump cover seal ring; 3- pump cover; 4- inner rotor; 5- outer rotor; 6- housing; 7- motor assembly; 8- upper cover seal ring; 9- upper cover assembly; 10- PCBA board; 11- upper cover; 12- enameled wire; 13- grounding terminal; 14- lower wire rack; 15- upper wire rack; 16- stator core; 17- three-phase terminal; 18- hollow shaft; 19- rotor core; 20- magnet; 21- magnetic ring, 22- coating protective layer. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the utility model more clearly understood, the utility model is further described in detail below in conjunction with embodiments and drawings. The schematic implementation manner of the utility model and its description are only used to explain the utility model and are not intended to limit the utility model.

[0026] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to those skilled in the art that these specific details are not necessary to implement the present invention. In other embodiments, in order to avoid confusing the present invention, well-known structures, circuits, materials or methods are not specifically described.

[0027] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] In the description of the present invention, the terms "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention 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. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0029] Embodiment 1:

[0030] The motor in the existing electronic oil pump is adopted as follows Figure 1 The structure shown in FIG. 1 is a structure in which the stator core 16 and the enameled wire 12 are isolated by the upper wire rack 15 and the lower wire rack 14, and the three-phase terminal 17 is used as an electrical connection, and the grounding terminal 13 cooperates with the three-phase terminal 17. The specific process is as follows:

[0031] 1. Place the motor stator core 16 on a fixed fixture;

[0032] 2. Place the upper and lower wire racks 14 on the wire rack fixing tooling respectively;

[0033] 3. Turn on the equipment and insert the upper and lower wire racks 14 into the motor stator core 16;

[0034] 4. Place the assembled stator core 16 in a winding tool for winding.

[0035] The lower bobbin 14, the upper bobbin 15 and the slot of the stator core 16 are in an interference fit relationship, which is used to ensure the basic insulation between the enameled wire 12 and the stator core 16. However, this method is complicated in winding, and the assembly process is complicated due to the large number of parts, and the cost is also high. At the same time, since the bobbin needs to be inserted into the slot of the stator core 16, the area of ​​the stator slot becomes smaller, and the area where the enameled wire 12 can be wound becomes smaller, resulting in a low stator slot fill rate.

[0036] In order to solve the above defects, Figure 2 As shown in , in Example 1, the stator core 16 used has a coating protective layer 22, and the coating protective layer 22 has insulating properties. The coating protective layer 22 is arranged at the contact surface between the stator core 16 and the enameled wire 12 to form an insulating partition between the stator core 16 and the enameled wire 12. The coating protective layer 22 is preferably a paint film layer, which has insulating properties and can be applied in a coating manner. The paint film layer can be any one of a polyesterimide layer, a polyimide layer, and a polyester layer, and can also be a composite layer of polyesterimide and polyamideimide.

[0037] In this embodiment, a protective coating 22 is designed to be applied on the surface of the stator core 16 as an insulating layer. This insulating layer can be used to directly isolate the stator core 16 and the enameled wire 12, so that the wire rack can be replaced, and the upper wire rack 15 and the lower wire rack 14 can be eliminated. The advantage of this design is that it can simplify the winding operation, and there is no need to install the upper and lower wire racks 14, and it reduces the number of parts, reduces the difficulty of assembly, and reduces costs. The area of ​​the stator slot is increased, and the area where the enameled wire 12 can be wound is increased, which increases the stator slot full rate. The power density is improved, the motor performance is improved, the weight is reduced, and the compatibility of field applications is improved.

[0038] The coating protection layer 22 can be designed to be applied locally or entirely. Local coating is applied only on the surface of the stator core 16 that contacts the enameled wire 12, while entirely coating is applied to the entire surface of the stator core 16. The selection can be made according to actual conditions.

[0039] Preferably, the coating protection layer 22 may be designed to have a thickness of 10 to 20 microns, which can improve wear resistance and extend the service life of the stator core 16 while ensuring good insulation isolation.

[0040] Embodiment 2:

[0041] A motor stator includes the stator core 16 of Example 1, and also includes an enameled wire 12, the enameled wire 12 includes a copper busbar and an insulating layer, the insulating layer covers the copper busbar to form an insulating protection on the outside of the copper busbar, and the copper busbar and the insulating layer form an insulating winding, and the insulating winding of the enameled wire 12 is wound in a winding manner and adhered to the stator core 16.

[0042] By adopting this method, the dependence on the wire rack for insulation isolation between the stator core 16 and the enameled wire 12 is eliminated, the number of parts in the motor stator is reduced, the cost is reduced, the assembly complexity is reduced, and the stator slot fill rate is improved.

[0043] Embodiment 3:

[0044] Provided in this embodiment is a motor, which includes a motor stator as in Embodiment 2, and also includes a motor assembly 7, the motor assembly 7 includes a hollow shaft 18, a rotor core 19, a magnet 20 and a magnetic ring 21, the two ends of the hollow shaft 18 are respectively matched with the stator core 16 and the rotor core 19, the hollow shaft 18 is located in the middle, matched with the rotor core 19, the enameled wire 12, and the stator core 16, and the central axis coincides, and the magnet 20 is matched with the magnetic ring 21, and the magnet 20 is sleeved inside the rotor core 19.

[0045] Embodiment 4:

[0046] The present embodiment provides an electronic oil pump, which includes the motor in Embodiment 2, and further includes a casing seal ring 1, a pump cover seal ring 2, a pump cover 3, an inner rotor 4, an outer rotor 5, a casing 6, a motor assembly 7, an upper cover seal ring 8, an upper cover assembly 9, a PCBA board 10, and an upper cover 11. The casing seal ring 1, the pump cover seal ring 2, the pump cover 3, the inner rotor 4, the outer rotor 5, the casing 6, the motor assembly 7, the upper cover seal ring 8, and the upper cover assembly 9 can be assembled in an existing assembly manner, and the motor can also be matched in the same manner as the existing electronic oil pump.

[0047] The upper cover assembly 9 includes a PCBA board 10 and an upper cover 11. The PCBA board 10 is provided with a paint film coating, and the paint film coating can be made of polyesterimide, polyimide, polyester material, or polyesterimide / polyamideimide composite material.

[0048] In the existing technology, the protection method of PCBA is to apply three-proof paint on the surface of PCBA board 10. The three-proof paint is sprayed into the required spraying area by spraying equipment, and then cured by different curing methods (solvent-based curing, room temperature curing, thermal curing and ultraviolet light curing, etc.), forming a solid protective layer on the surface of PCBA board 10. This technical solution is complex, costly, has large differences in insulation performance, and the thickness of the protective layer is large and uneven. In order to solve this problem, in this embodiment, a paint film coating is provided on PCBA board 10. The paint film coating can be applied by coating and electroplating, which is low in cost, and the obtained paint film coating is thin and uniform, and has consistent insulation properties.

[0049] The utility model has the following technical advantages:

[0050] 1. The motor stator eliminates the wire frame parts, simplifies the stator assembly process, greatly improves the production cycle, production efficiency, and reduces PPM.

[0051] 2. The number of parts used is reduced, the cost is reduced, and the product is lightweight and miniaturized.

[0052] 3. Low equipment investment, high power density, high slot fill rate, low cost, lightweight, and high compatibility in field applications.

[0053] 4. The PCBA board 10 has low cost, consistent insulation, and a uniform insulation layer on the surface of the PCBA board 10.

[0054] 5. Due to the improvement of the motor stator and the PCBA board 10, the electronic oil pump can achieve the advantages of light weight, high performance, small size and low cost.

[0055] The above specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above are only specific implementation methods of the utility model and are not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A stator core, characterized in that: The surface of the stator core (16) is provided with a coating protection layer (22), and the coating protection layer (22) is arranged at the contact surface between the stator core (16) and the enameled wire (12) to form an insulating partition between the stator core (16) and the enameled wire (12).

2. A stator core according to claim 1, characterized in that: The coating protective layer (22) is arranged on all exposed surfaces of the stator core (16).

3. A stator core according to claim 1 or 2, characterized in that: The coating protection layer (22) is a paint film layer.

4. A stator core according to claim 3, characterized in that: The paint film layer is any one of a polyesterimide layer, a polyimide layer, and a polyester layer, or is a composite layer of polyesterimide and polyamideimide.

5. A stator core according to claim 4, characterized in that: The coating protection layer (22) has a thickness of 10 to 20 micrometers.

6. A motor stator, characterized in that: It comprises a stator core as described in any one of claims 1 to 5.

7. The motor stator according to claim 6, characterized in that: It also comprises an enameled wire (12), the enameled wire (12) comprising a copper busbar and an insulating layer, the insulating layer covering the copper busbar, the copper busbar and the insulating layer forming an insulating winding, the insulating winding of the enameled wire (12) being wound and fitted to the stator core (16).

8. A motor, characterized in that: It comprises the stator core (16) as described in any one of claims 1 to 5 or the motor stator as described in claim 6 or 7.

9. The motor according to claim 8, characterized in that: The motor assembly (7) further comprises a hollow shaft (18), a rotor core (19), a magnetic steel (20) and a magnetic ring (21), wherein two ends of the hollow shaft (18) respectively cooperate with the stator core (16) and the rotor core (19), the magnetic steel (20) cooperates with the rotor core (19), and the magnetic ring (21) cooperates and is connected with the magnetic steel (20).

10. An electronic oil pump, characterized in that: A motor according to claim 8 or 9, further comprising a casing sealing ring (1), a pump cover sealing ring (2), a pump cover (3), an inner rotor (4), an outer rotor (5), a casing (6), a motor assembly (7), an upper cover sealing ring (8), an upper cover assembly (9), a PCBA board (10), and an upper cover (11), wherein a paint film coating is provided on the PCBA board (10).

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