KR-102962566-B1 - Axial Gap Type Electric Motor and Electric Water Pump Using the Same

KR102962566B1KR 102962566 B1KR102962566 B1KR 102962566B1KR-102962566-B1

Abstract

The present invention relates to a slim axial gap type electric motor that significantly reduces the overall height of the pump by using a laminated printed circuit board in which a plurality of coil patterns are formed on each layer, and an electric water pump using the same. The above electric motor comprises: a rotor rotatably supported in a fluid flow passage between a pump cover and a body case; and a stator integrally formed in the body case to generate a rotating magnetic field to drive the rotation of the rotor; wherein the stator comprises a stacked printed circuit board (PCB) having a plurality of coil patterns formed in each layer and a plurality of through holes formed in the center of each of the plurality of coil patterns; a plurality of segmented cores each having teeth coupled to the plurality of through holes; and a back yoke having a plurality of through holes coupled to the leading edge of the teeth protruding below the through holes of the printed circuit board (PCB).

Inventors

김병수

Assignees

주식회사 아모텍

Dates

Publication Date: 20260508
Application Date: 20241129
Priority Date: 20231129

Claims (14)

A rotor rotatably supported in a fluid flow passage between a pump cover and a body case; a stator disposed in a sealed lower space formed by the body case and an upper cover to generate a rotating magnetic field to drive the rotation of the rotor; and a partition disposed on the upper part of the body case to separate the rotor and the stator; comprising The above stator is, A stacked printed circuit board (PCB) having a plurality of coil patterns formed on each layer and a plurality of through holes formed in the center of each of the plurality of coil patterns; A plurality of segmented cores, each having a tooth coupled to the plurality of through holes; and A back yoke having a plurality of through holes that are coupled to the tip of the tooth protruding below the through hole of the printed circuit board (PCB); The bulkhead of the body case has a plurality of through holes at positions corresponding to the plurality of divided cores, and An axial gap type electric motor for an electric water pump, wherein the shoes of the plurality of split cores coupled to the plurality of through holes are positioned to be exposed to a fluid flow passage, the split cores are formed by laminating silicon steel, and the exposed shoes and bulkheads are waterproofed so as to form the same plane.
A rotor rotatably supported in a fluid flow passage between a pump cover and a body case; a stator disposed in a sealed lower space formed by the body case and an upper cover to generate a rotating magnetic field to drive the rotation of the rotor; and a partition disposed on the upper part of the body case to separate the rotor and the stator; comprising The above stator is, A stacked printed circuit board (PCB) having a plurality of coil patterns formed on each layer and a plurality of through holes formed in the center of each of the plurality of coil patterns; A plurality of segmented cores, each having a tooth coupled to the plurality of through holes; and A back yoke having a plurality of through holes that are coupled to the tip of the tooth protruding below the through hole of the printed circuit board (PCB); The bulkhead of the body case has a plurality of through holes at positions corresponding to the plurality of divided cores, and The shoes of the plurality of split cores coupled to the plurality of through holes are positioned to be exposed to a fluid flow passage, and the split cores are made of soft magnetic powder (SMC). An axial gap type electric motor for an electric water pump, wherein a waterproof sealing treatment is performed using epoxy or urethane at the boundary between the shoe and the through hole.
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In paragraph 1 or 2, The above-described stacked printed circuit board (PCB) is composed of a multilayer substrate having a plurality of coil patterns formed on each layer to form U, V, and W three-phase coils, and The above plurality of coil patterns are connected in series for each of the U, V, and W phases, and the leading start line among the plurality of coil patterns assigned to each of the serially connected U, V, and W phases is commonly connected to a common electrode terminal to form a neutral point (COM) for Y-connection. An axial gap type motor for an electric water pump, wherein the final end wire among the plurality of coil patterns assigned to each of the series-connected U, V, and W phases is connected to the U, V, and W three-phase output terminals of an inverter circuit through terminals other than U, V, and W.
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A pump housing having a pump cover having an inlet for introducing fluid and an outlet for discharging the introduced fluid, and a body case coupled to the lower part of the pump cover to form a fluid flow passage between the inlet and the outlet; A rotor rotatably supported in the above fluid flow passage; An impeller formed integrally with the rotor on the upper side of the rotor; and It includes a stator integrally formed in the above body case to generate a rotating magnetic field and drive the rotation of the rotor; The above stator A stacked printed circuit board (PCB) having a plurality of coil patterns formed on each layer and a plurality of through holes formed in the center of each of the plurality of coil patterns; A plurality of segmented cores, each having a tooth coupled to the plurality of through holes; and A back yoke having a plurality of through holes that are coupled to the tip of the tooth protruding below the through hole of the printed circuit board (PCB); An electric water pump in which the shoes of the plurality of segmented cores coupled to the plurality of through holes are positioned to be exposed to a fluid flow passage, the segmented cores are formed by laminating silicon steel, and the exposed shoes and bulkheads are waterproofed so as to form the same plane.
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In Paragraph 9, The above-described stacked printed circuit board (PCB) is composed of a multilayer substrate having a plurality of coil patterns formed on each layer to form U, V, and W three-phase coils, and The above plurality of coil patterns are connected in series for each of the U, V, and W phases, and the leading start line among the plurality of coil patterns assigned to each of the serially connected U, V, and W phases is commonly connected to a common electrode terminal to form a neutral point (COM) for Y-connection. An electric water pump in which the final end wire among the plurality of coil patterns assigned to each of the series-connected U, V, and W phases is connected to the U, V, and W three-phase output terminals of an inverter circuit through terminals other than U, V, and W.
In Paragraph 9, The above-mentioned stacked printed circuit board (PCB) is A multilayer substrate having a plurality of coil patterns connected in series for each phase U, V, and W formed on each layer; and An electric water pump comprising: a bottom layer substrate having a common electrode terminal in which the leading start line of each U, V, and W phase is commonly connected among a plurality of coil patterns assigned to each U, V, and W phases connected in series to form a Y-connection neutral point (COM), and U, V, and W output terminals in which the terminal outside U, V, and W is connected to the final end line of each U, V, and W phase among a plurality of coil patterns assigned to each U, V, and W phases connected in series to be connected to the U, V, and W three-phase output terminals of an inverter circuit.
In Paragraph 13, The above multilayer substrate is A first layer substrate comprising, for each of the U, V, and W phases, a first coil pattern having a start line among two series-connected coil patterns arranged on the left and formed as a spiral conductive pattern rotating clockwise, and a second coil pattern having an end line among the two coil patterns arranged on the right and formed as a spiral conductive pattern rotating counterclockwise; A second layer substrate comprising, for each of the U, V, and W phases, a third coil pattern having a start line among two series-connected coil patterns arranged on the right and formed as a spiral conductive pattern rotating clockwise, and a fourth coil pattern having an end line among the two coil patterns arranged on the left and formed as a spiral conductive pattern rotating counterclockwise; A third layer substrate comprising, for each of the two coil patterns of U, V, and W, a fifth coil pattern having a start line positioned on the left and formed as a spiral conductive pattern rotating clockwise, and a sixth coil pattern having an end line positioned on the right and formed as a spiral conductive pattern rotating counterclockwise; and A fourth layer substrate comprising: a seventh coil pattern having a start line among two coil patterns for each U, V, and W phase, which is positioned on the right and is formed as a spiral conductive pattern rotating clockwise, and an eighth coil pattern having an end line among the two coil patterns, which is positioned on the left and is formed as a spiral conductive pattern rotating counterclockwise; An electric water pump in which two coil patterns are alternately arranged for each of the U, V, and W phases on each floor.

Description

Slim Axial Gap Type Electric Motor and Electric Water Pump Using the Same The present invention relates to a slim axial gap type electric motor and an electric water pump using the same, and more specifically, to a slim axial gap type electric motor and an electric water pump using the same in which a plurality of split cores are coupled to through holes of a laminated printed circuit board (PCB) in which a plurality of coils are patterned, and the plurality of split cores are connected using a back yoke, thereby significantly reducing the overall height of the pump while increasing the efficiency of the motor. Generally, water pumps applied to vehicles are devices that function to circulate coolant. They are typically configured as engine-driven water pumps, which are forcibly driven by a belt to rotate a pump impeller and circulate coolant by sucking in and discharging it, with a seal unit assembled inside to prevent coolant leakage, and electric water pumps, which drive an electric motor using electricity provided by a battery or similar source, and circulate coolant by rotating an impeller through the electric motor to suck in and discharge it. Among them, the electric water pump mentioned above does not require the engine driving power of the vehicle compared to the engine-driven water pump, and thus has the advantage of increased engine efficiency and consequently improved fuel economy. Furthermore, it offers the advantage of being able to precisely control the temperature of the coolant, and is therefore being widely applied to various vehicle models recently. Furthermore, in the case of electric vehicles, hybrid vehicles, or fuel cell vehicles, the importance of electric water pumps is increasingly growing compared to the aforementioned engine-driven water pumps, as driving takes place with the engine stopped (in the case of hybrid vehicles), or even in situations where there is no engine to drive the water pump (in the case of electric vehicles or fuel cell vehicles). Meanwhile, among the above electric water pumps, the canned type electric water pump is a pump driven by an electric motor having a sealed container in the shape of a can inside the stator, and is structured such that a can structure is inserted between the rotor and the stator, and the hydraulic section is extended to the rotor section so that the rotor is submerged in cooling water, thereby allowing the incoming water to properly cool the frictional heat generated in the rotor. Korean Published Patent Application No. 10-2021-0108844 (Patent Document 1) proposes an axial gap type electric motor for a water pump (EWP) comprising: a rotor rotatably supported in a fluid flow passage between a pump cover and a body case; a stator disposed in a lower space formed by the body case and an upper cover to generate a rotating magnetic field to drive the rotation of the rotor; and a partition disposed on the upper part of the body case to separate the rotor and the stator, wherein the rotor is equipped with a non-rare earth magnet. The conventional motor structure of Patent Document 1 has a problem of low assembly productivity because the stator core of the stator is formed in a "T" shape and the back yoke is formed by stacking multiple teeth made of soft magnetic composites (SMC) and multiple electrical steel sheets connecting the multiple teeth. In addition, conventional axial gap type motors for water pumps use a long stator core with a "T" shape and employ a stator in which coils are wound on a bobbin that forms a coil winding area on the outer circumference of the core, and since multiple stator cores are arranged parallel to the axial direction, it was very difficult for the water pump to have a slim structure in the axial direction. FIG. 1 is a perspective view of an electric water pump using an axial gap type electric motor according to the present invention. FIG. 2 is an axial cross-sectional view of an electric water pump using an axial gap type electric motor according to a first embodiment of the present invention. FIG. 3 is a front view of an electric water pump using an axial gap type electric motor according to a second embodiment of the present invention. FIG. 4 is a plan view of an electric water pump using an axial gap type electric motor according to a second embodiment of the present invention. Figures 5a and 5b are the cross-sectional views along line AA and line BB of Figure 4, respectively. FIG. 6 is a modular exploded perspective view of an electric water pump using an axial gap type electric motor according to a second embodiment of the present invention. FIG. 7 is a completely exploded perspective view of an electric water pump using an axial gap type electric motor according to a second embodiment of the present invention. FIGS. 8 and FIGS. 9 are a cross-sectional view and an exploded perspective view, respectively, of a stator of an axial gap type motor according to the present invention. FIGS. 10a to 10e are plan vi