CN113922547A

CN113922547A - Motor winding part and injection molding motor with same

Info

Publication number: CN113922547A
Application number: CN202110635911.1A
Authority: CN
Inventors: 姬中营; 金万兵; 田阁; 彭光明
Original assignee: Shanghai Moons Electric Co Ltd
Current assignee: Shanghai Moons Electric Co Ltd
Priority date: 2021-06-08
Filing date: 2021-06-08
Publication date: 2022-01-11

Abstract

The invention relates to a motor winding part and an injection molding motor with the same, wherein the winding part is formed by two times of plastic coating, and comprises a winding part, a low-pressure injection molding part and a high-pressure injection molding part, wherein the low-pressure injection molding part firstly performs plastic coating on the winding part to form a low-pressure injection molding preformed assembly, and the low-pressure injection molding preformed assembly performs plastic coating through the high-pressure injection molding part. Compared with the prior art, the invention has the advantages of being suitable for complex working conditions, high product qualification rate, high finished product reliability and the like.

Description

Motor winding part and injection molding motor with same

Technical Field

The invention relates to the field of injection molding motors, in particular to a motor winding part and an injection molding motor with the same.

Background

Along with the trend of miniaturization development of terminal products, the motor is used as a power component, and the requirement of a customer on installation space cannot be met according to the traditional motor structure, so that the plastic package (injection molding) motor is applied. The designated subassembly (winding part) of motor of moulding plastics forms motor structure support component through the mode of high pressure injection moulding, provides the basis for motor miniaturization, and the material of moulding plastics fills stator core and winding space, forms the entity, improves coefficient of heat conductivity, more does benefit to the stator heat dissipation in the motor operation, and this technology has certain competition advantage, and the trade is used and is constantly expanded.

However, the injection molding motors all have a common problem that a stator assembly (winding part) needs to be used as an insert in an injection molding process and is placed in an injection mold for plastic coating, the winding is in direct contact with an injection molding material in the injection molding process and is influenced by high temperature, and on the other hand, huge impact force generated by the flow of the injection molding material directly acts on an enameled wire. The winding enameled wire has certain special requirements as an important component of electromagnetic conversion of a motor, and the quality problems in the following aspects are easily caused in the plastic coating process:

1. the enameled wire is subjected to high-temperature heat transfer of the injection molding material, so that the insulating film on the surface layer of the enameled wire is easily damaged, and turn-to-turn breakdown of a coil occurs;

2. the diameter of the enameled wire of the winding is generally thinner, and the enameled wire is influenced by huge impact force generated by flowing of an injection molding material and internal stress generated by curing of the injection molding material in the injection molding process, so that the enameled wire is easy to break;

3. the stator winding has limited structural strength and is easy to deform under the action of impact force, so that the enameled wire is leaked out of the injection molding material

Based on the above problems, the yield of products and the reliability are affected, thereby limiting the application conditions of the motor.

Disclosure of Invention

The present invention is directed to overcoming the above-mentioned problems of the prior art and providing a winding part for an electric machine and an injection molded electric machine having the winding part.

The purpose of the invention can be realized by the following technical scheme:

according to one aspect of the invention, the winding part is formed by two times of plastic coating, and comprises a winding part, a low-pressure injection part and a high-pressure injection part, wherein the low-pressure injection part performs plastic coating on the winding part to form a low-pressure injection preformed assembly, and the low-pressure injection preformed assembly performs plastic coating through the high-pressure injection part.

As a preferred technical solution, the low-pressure injection molding part is a low-pressure pre-molding part used for pre-molding the winding part by using a low-pressure injection molding process.

As a preferred technical scheme, the specific forming process of the low-pressure preforming part is as follows: and placing the winding part as an insert in a forming die, and performing plastic coating and preforming by adopting a heat shrinkable material and extremely low pressure.

As a preferred technical scheme, the extremely low pressure is 1-5 Mpa.

Preferably, the heat-shrinkable material is a high-fluidity heat-shrinkable material.

As a preferred technical scheme, the specific process of the low-pressure injection molding preformed component through the high-pressure injection molding part for plastic coating molding comprises the following steps:

and placing the cooled low-pressure injection molding preformed component into a forming die in an insert mode, and performing plastic coating forming by adopting an injection molding material in a high-pressure high-injection process.

As a preferable technical scheme, the high-pressure high-injection pressure is 300 MPa.

As a preferred technical scheme, the injection molding material is a heat-shrinkable material or thermosetting plastic.

As a preferred technical solution, the motor winding component is a stator assembly or a rotor assembly.

According to another aspect of the invention, there is provided an injection moulded motor having a winding part, characterised in that the motor comprises said motor winding part.

Compared with the prior art, the invention has the following advantages:

1) the invention adopts low-pressure injection molding as an intermediate transition process, and can reduce injection molding pressure and injection molding temperature due to the characteristics of high fluidity and low injection molding temperature, effectively protect the enameled wire, and reduce the requirements on the enameled wire material and the insulating layer.

2) Because the invention uses the low-pressure injection molding preforming, the invention can effectively solve the quality problems of interturn, wire breakage, deformation and the like of the enameled wire caused by directly adopting a high-pressure injection molding process to wrap the winding in the prior art.

3) According to the scheme of the invention, the production yield is high, the manufacturing process is stable, and the long-term operation reliability of the motor is higher.

Drawings

FIG. 1 is a schematic view of a winding assembly of an electric machine;

FIG. 2 is a schematic view of a low pressure injection molding preform;

FIG. 3 is a schematic view of high pressure injection molding.

Wherein 1 is a winding part, 2 is a low-pressure injection molding part, 3 is a high-pressure injection molding part, and 4 is a low-pressure injection molding preformed component.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

Example 1

As shown in fig. 1-3, a winding component of an electric machine is a winding component formed by two times of plastic coating, and comprises a winding part 1, a low-pressure injection part 2 and a high-pressure injection part 3, wherein the low-pressure injection part 2 performs plastic coating on the winding part 1 to form a low-pressure injection preformed component 4, and the low-pressure injection preformed component 4 performs plastic coating on the winding part 3.

The invention provides a secondary injection molding scheme for a motor winding part, namely the motor winding part is molded by twice plastic coating as shown in figure 1, and comprises the steps of preforming the winding part of a motor, pre-molding a stator part by using a low-pressure injection molding process to protect the winding part, and performing high-pressure injection molding after the part is cooled to meet the design final molding requirement.

The low-pressure injection molding means that the winding part is placed in a forming die as an insert, and then high-fluidity heat-shrinkable material is adopted to perform plastic coating forming at extremely low pressure to prepare an intermediate semi-finished product, as shown in fig. 2. The extremely low pressure is 1-5 Mpa.

The high-pressure injection molding refers to that a low-pressure injection molding assembly is placed into a molding die in an insert mode, and then is subjected to plastic coating molding by adopting a thermal shrinkage or thermosetting plastic material and a high-pressure high-injection process so as to meet the requirements of designing a final molding material, size and shape, as shown in fig. 3. The high-pressure high-injection pressure is 300 MPa.

Example 2

The motor winding part is a rotor assembly, and the rest is the same as that of the embodiment 1.

Example 3

An injection moulded motor having a winding part, the motor comprising said motor winding part.

While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a motor winding part, its characterized in that, this part is for adopting twice winding part of plastic-coated molding, and this winding part includes winding portion, low pressure part and the high pressure part of moulding plastics, the low pressure part of moulding plastics forms the low pressure and moulds plastics the preformed subassembly to winding portion after carrying out the plastic-coated molding earlier, the preformed subassembly of moulding plastics of low pressure carries out the plastic-coated molding through the high pressure part of moulding plastics.

2. A winding assembly according to claim 1, wherein said low pressure injection molded part is a low pressure pre-molded part for pre-molding the winding portion using a low pressure injection molding process.

3. The winding part of an electric machine according to claim 2, wherein the low-pressure pre-forming section is formed by a specific process comprising: and placing the winding part as an insert in a forming die, and performing plastic coating and preforming by adopting a heat shrinkable material and extremely low pressure.

4. A winding part for an electrical machine according to claim 3, wherein said very low pressure is 1-5 Mpa.

5. A winding assembly according to claim 3, wherein said heat-shrinkable material is a high-flow heat-shrinkable material.

6. The winding part of an electric machine according to claim 1, wherein the low-pressure injection molding preformed assembly is subjected to the plastic coating molding through the high-pressure injection molding part by the specific process of:

7. A winding part for an electrical machine according to claim 6, wherein said high pressure high emission pressure is in particular 300 MPa.

8. A winding assembly according to claim 6, wherein said injection moulded material is a heat shrinkable material or a thermosetting plastic.

9. The electrical machine winding component of claim 1, wherein the electrical machine winding component is a stator or rotor assembly.

10. An injection moulded electrical machine having a winding part, characterised in that the machine comprises a winding part of the electrical machine according to any one of claims 1-9.