Motor air circulation cooling system based on internal pressure difference

Abstract

The present invention relates to an air circulation cooling system for an electric motor based on an internal pressure difference. More specifically, the invention relates to an air circulation cooling system for an electric motor based on an internal pressure difference that maintains the external appearance of the existing electric motor while partially modifying the shapes of the stator and rotor, installing rotor blades on only one side, and forming axial passages in the stator and rotor; thereby inducing a pressure difference inside the motor through the unidirectional rotation of the blades during operation, causing air to circulate along the air passages within the stator and rotor to cool the heat of key components such as cores and coils. To this end, the present invention provides an electric motor air circulation cooling system based on an internal pressure difference, comprising: a stator module; a rotor mounted on the inside of the stator; a shaft inserted into the inside of the rotor around a rotation axis and rotating, wherein a blade is formed at one end of the rotor; a pressure difference is generated between the side where the blade is formed and the other side where the blade is not formed by the rotation of the rotor, such that air can be circulated due to the pressure difference between the side of the rotor and the other side.

Description

Technology Field

[0001] The present invention relates to an air circulation cooling system for an electric motor based on an internal pressure difference. More specifically, the invention relates to an air circulation cooling system for an electric motor based on an internal pressure difference that maintains the external appearance of the existing electric motor while partially modifying the shapes of the stator and rotor, installing rotor blades on only one side, and forming axial passages in the stator and rotor; thereby inducing a pressure difference inside the motor through the unidirectional rotation of the blades during operation, causing air to circulate along the air passages within the stator and rotor to cool the heat of key components such as cores and coils. Background Technology

[0002] Generally, an electric motor is composed of a stator and a rotor inserted inside the stator so as to be rotatable around a rotation axis.

[0003] During the operation of an electric motor, high temperatures are generated in the stator and rotor. As the internal temperature of the motor rises, the driving efficiency of the motor drops sharply. Due to this problem, various studies are actively being conducted to cool the motor in order to maintain its driving efficiency.

[0004] Meanwhile, the cooling methods mainly used for electric motors include semi-closed cooling and total cooling. Semi-closed cooling methods use natural air cooling utilizing external airflow or forced air cooling using a cooling fan and a blower motor to drive the fan.

[0005] However, the application of a semi-enclosed enclosure structure has the disadvantage that the ingress of external foreign matter causes motor failure, thereby shortening the motor's lifespan.

[0006] Furthermore, while totally enclosed motors can significantly improve maintainability by preventing the ingress of external substances, the development of optimal cooling technology to solve heat problems generated by the motor is essential due to the limited heat flow to the outside.

[0007] Furthermore, conventional cooling systems for fully enclosed motors utilize the forced air cooling system previously used for semi-enclosed motors; however, this had limitations in that heat generated from the coils, rotor, and core inside the motor could not be efficiently dissipated to the outside and remained inside.

[0008] In particular, in industrial sites requiring miniaturization and high performance of electric motors, internal heat accumulation has led to various problems, such as equipment performance degradation, shortened lifespan, and the risk of failure.

[0009] Therefore, there is a need to develop a means to induce airflow inside the motor and efficiently dissipate heat by optimizing only the internal structure, without separately modifying the frame or external duct structure.

[0011] Prior Art: KR Registered Patent Publication No. 10-1408869 (Published June 18, 2014) The problem to be solved

[0012] The present invention was devised to solve the above-mentioned problems, and aims to provide an electric motor air circulation cooling system based on internal pressure difference that can effectively cool the stator coils, windings, and rotor, which generate a lot of heat, and in particular, effectively improve cooling performance by circulating internal air without a separate cooling fan or external blower by changing the formation of the stator and rotor while maintaining the external frame of the electric motor as before. means of solving the problem

[0013] The electric motor air circulation cooling system based on an internal pressure difference according to the present invention, devised to achieve the above objective, comprises: a stator module; a rotor mounted on the inside of the stator; a shaft inserted into the inside of the rotor around a rotation axis and rotating; and a blade formed on one end of the rotor; a pressure difference between the one side where the blade is formed and the other side where the blade is not formed is generated by the rotation of the rotor and the blade is rotated by the rotation of the rotor; and air can be circulated by the pressure difference between the one side and the other side of the rotor.

[0014] In addition, the rotor further includes a plurality of air flow paths formed therein through which internal air can circulate.

[0015] In addition, the stator module is characterized by comprising a stator core having a slot formed therein to allow a winding to be inserted, a stator winding end formed at the end of the stator core to allow a winding protruding from the slot to return to the slot, and a stator molding that surrounds the outer surface of the stator core and the stator winding end and has a plurality of air flow paths formed therein. Effects of the invention

[0016] According to the present invention, the air-cooling radiator used in conventional air-cooling methods is unnecessary, and the core and coil heating parts can be cooled by internal air flow.

[0017] In addition, according to the present invention, there is an effect that cooling performance can be significantly improved by partially modifying only the internal stator and rotor shapes without changing the frame, mounting dimensions, or appearance.

[0018] In addition, according to the present invention, the temperature of the core, coil heating part, etc. is reduced, thereby improving the durability and lifespan of the electric motor. Brief explanation of the drawing

[0019] FIG. 1 is a cross-sectional view of an electric motor air circulation cooling system based on an internal pressure difference according to a preferred embodiment of the present invention. FIG. 2 is a diagram showing the airflow in FIG. 1. FIG. 3 is a three-dimensional cross-sectional view showing the flow of air in an electric motor air circulation cooling system due to an internal pressure difference according to a preferred embodiment of the present invention. FIG. 4 is a cross-sectional view of a stator module, FIG. 5 is a cross-sectional view of a rotor module, FIG. 6 is a drawing illustrating a molding jig for manufacturing a stator molding, FIG. 7 is a drawing showing a stator inserted into a molding jig to manufacture a stator molding. FIG. 8 is a drawing illustrating the assembly of a central rod that forms an internal space in the stator molding and serves as a molding material injection port in FIG. 7. FIG. 9 is a drawing illustrating the assembly of pins capable of passing between stator windings to form an air passage. FIG. 10 is a drawing showing a molding material injected into the structure of FIG. 9. FIG. 11 is a drawing illustrating the disassembly of the molding solution in the order of pin, center rod, and molding jig after the molding solution has hardened. Specific details for implementing the invention

[0020] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, it should be noted that in assigning reference numerals to the components of each drawing, the same components are given the same reference numeral whenever possible, even if they are shown in different drawings. Furthermore, in describing the present invention, if it is determined that a detailed description of related known components or functions may obscure the essence of the present invention, such detailed description is omitted. Additionally, while preferred embodiments of the present invention will be described below, the technical concept of the present invention is not limited or restricted thereto and can be modified and implemented in various ways by those skilled in the art.

[0021] FIG. 1 is a cross-sectional view of an electric motor air circulation cooling system based on an internal pressure difference according to a preferred embodiment of the present invention; FIG. 2 is a diagram showing the airflow in FIG. 1; FIG. 3 is a three-dimensional cross-sectional view showing the airflow in an electric motor air circulation cooling system based on an internal pressure difference according to a preferred embodiment of the present invention; FIG. 4 is a cross-sectional view of a stator module; FIG. 5 is a cross-sectional view of a rotor module; FIG. 6 is a diagram showing a molding jig for manufacturing a stator molding; FIG. 7 is a diagram showing a stator inserted into a molding jig to manufacture a stator molding; FIG. 8 is a diagram showing a central rod assembled in FIG. 7, which forms an internal space in the stator molding and serves as a molding material injection port; FIG. 9 is a diagram showing a fin assembled that can pass between the stator windings to form an air passage; FIG. 10 is a diagram showing molding material injected into the structure of FIG. 9; FIG. 11 shows the fin, central rod, and molding jig in that order after the molding solution has hardened. This is a drawing illustrating the disassembly process.

[0023] Hereinafter, the components of an electric motor air circulation cooling system based on an internal pressure difference according to a preferred embodiment of the present invention will be described in detail.

[0025] Referring to FIGS. 1 to 5, an electric motor air circulation cooling system based on an internal pressure difference according to a preferred embodiment of the present invention comprises a stator module (100), a rotor (200), a shaft (300), and a frame (400).

[0027] The stator module (100) is formed by winding a plurality of coils and generating magnetic flux when power is applied to rotate the rotor, and includes a stator core (110), a stator winding end portion, and a stator molding (130).

[0029] The stator module (100) is composed of a first stator winding end portion (120b) located in the same direction as the front of the shaft (300), a second stator winding end portion (120a) located at the end opposite to the first stator winding end portion (120b) where a coil is wound, and a stator core (110) located between the first stator winding end portion (120b) and the second stator winding end portion (120a), and each component is covered by a stator molding (130).

[0031] A slot is formed inside the stator core (110) so that a winding can be inserted, and stator winding end portions are formed at each end of the stator core (110) so that the winding protruding from the slot can return to the slot.

[0033] The stator molding surrounds and combines the first stator winding end portion (120b), the second stator winding end portion (120a), and the stator core (110), and has an air flow path formed therein, so that the first stator winding end portion (120b), the second stator winding end portion (120a), and the stator core (110) can be cooled by air flowing in the air flow path.

[0035] The stator molding allows for the integral molding of the molding material onto the stator without changing the frame, thereby providing an air flow path, and enables air to flow along the air flow path to effectively cool the internal heat.

[0037] More specifically, the stator molding is provided with a first air flow path (130a) formed through the inner and outer surfaces, and a second air flow path (130b) formed in the same direction as the length direction of the stator molding.

[0039] The rotor (200) is mounted on the inside of the stator module (100), has an air flow path (220) formed therein, and has a blade (210) provided only at one end.

[0041] The rotor (200) of the present invention is equipped with blades (210) only at one end of the front or rear, so that when the rotor rotates, pressure is generated only on the side where the blades are equipped, and air can circulate inside along the passage due to the pressure difference between the front and rear, thereby effectively cooling.

[0043] In addition, a plurality of air flow paths (220) are formed in the rotor (200) through the front and rear ends in the longitudinal direction, so that air can move and circulate through the air flow paths (220).

[0045] In the air flow path (220) formed in the rotor (200) and the second air flow path (130b) provided in the stator molding, air flows in opposite directions, respectively.

[0047] For example, if air flows from the front to the rear in the air flow path (220) formed in the rotor (200), air flows from the rear to the front in the second air flow path (130b) provided in the stator molding so that air is circulated.

[0049] When air circulates in front of and behind the motor, heat dissipation through the frame (400) is increased, and as the air passes through the rotor core during internal circulation, the existing cooling performance can be improved.

[0051] In other words, since blades are provided only at one end of the rotor, a pressure difference occurs in the front and rear spaces of the motor, and air circulates internally through the air flow paths provided in the rotor and stator, thereby enhancing cooling performance.

[0053] Hereinafter, a method for manufacturing a stator mold of an electric motor air circulation cooling system based on an internal pressure difference according to a preferred embodiment of the present invention will be described in detail with reference to FIGS. 6 to 11.

[0055] Referring to Fig. 6, first, a molding jig is prepared that can serve as a mold to maintain the molding material being introduced in liquid form in the design shape and as a passage to guide the molding material being introduced.

[0057] A stator is inserted into a molding jig, and with reference to FIG. 7, when the stator is inserted, the position of the stator is fixed by the molding jig.

[0059] The stator molding has the shape of a cylinder with a hollow center. Referring to Fig. 8, a central rod is assembled to hollow out the central part.

[0061] The center rod serves to prevent the molding material from entering the inner diameter of the stator, while simultaneously serving as a molding material injection port.

[0063] The pin is fixed to the molding jig to pass between the windings, and the hole between the windings formed by the pin can become part of the air passage.

[0065] After the center rod and pin are assembled, the molding liquid is injected through the center rod. The injected molding liquid rises from the bottom along the channel formed in the molding jig and covers the entire stator.

[0067] Depending on the characteristics of the molding solution, once the solution has fully cured after a certain period of time, it is disassembled in the order of pin, center rod, and molding jig.

[0069] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications, changes, and substitutions within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention and the accompanying drawings are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by such embodiments and accompanying drawings. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention. Explanation of the symbols

[0070] 100 - Stator module 200 - Rotor 300 - Shaft 400 - Frame

Claims

Claim 1 A stator module; a rotor mounted on the inner side of the stator; and a shaft inserted into the inner side of the rotor around a rotation axis and rotating therein; wherein a blade is formed on one end of the rotor; wherein the blade rotates due to the rotation of the rotor, causing a pressure difference between the side where the blade is formed and the other side where the blade is not formed; and wherein air can be circulated due to the pressure difference between the side and the other side of the rotor. The stator module includes a stator molding, wherein the stator molding is integrally molded with a molding material on the stator without changing the frame to provide an air flow path, and allows air to flow along the air flow path to effectively cool internal heat, and comprises a first air flow path formed penetrating the inner and outer surfaces, and a second air flow path formed in the same direction as the longitudinal direction of the stator molding. A motor air circulation cooling system based on an internal pressure difference, comprising: a plurality of air flow paths formed in the rotor in the longitudinal direction, penetrating the front and rear ends, so that air can move and circulate through the air flow paths; and air flowing in opposite directions in the air flow path formed in the rotor and the second air flow path provided in the stator molding. Claim 2 delete Claim 3 In claim 1, the stator module comprises a stator core having a slot formed therein to insert a winding, a stator winding end formed at the end of the stator core to allow a winding protruding from the slot to return to the slot, and a stator molding that surrounds the outer surface of the stator core and the stator winding end and has a plurality of air flow paths formed therein, thereby forming an electric motor air circulation cooling system based on an internal pressure difference.

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