CN111864968A - Integrated sand core cast disc type motor shell and casting process - Google Patents
Integrated sand core cast disc type motor shell and casting process Download PDFInfo
- Publication number
- CN111864968A CN111864968A CN202010837719.6A CN202010837719A CN111864968A CN 111864968 A CN111864968 A CN 111864968A CN 202010837719 A CN202010837719 A CN 202010837719A CN 111864968 A CN111864968 A CN 111864968A
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- sand
- water channel
- end cover
- motor
- built
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/14—Casings; Enclosures; Supports
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/06—Cast metal casings
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
Abstract
The disk motor casing that adopts the as cast integral type psammitolite that this scheme provided adopts the casting process to form the motor end cover of integral type casting structure, sets up built-in water course on the inner chamber wall, and motor end cover terminal surface sets up the sand discharge groove of external and motor end cover's built-in water course intercommunication, and sand discharge groove area is great, and the clearance that can be comparatively swift is arranged sand, and the water course closing plate embedding sand discharge inslot welded seal of same shape after the clearance of arranging sand is accomplished. This scheme still provides a casting process who uses above-mentioned disc motor casing, places prefabricated water course psammitolite and sand discharge groove psammitolite in casting motor casing mould, only needs one shot forming can process out the motor casing midbody that has the psammitolite, clears away sand discharge groove psammitolite and water course psammitolite after, can obtain the motor end cover that has built-in water course. The casting process is simple, and the design of the reserved sand discharge position enables the mold to be easily cleaned of sand, easy sealing and no increase of welding cost.
Description
Technical Field
The invention belongs to the technical field of motor housings, and particularly relates to a disc type motor housing cast by an integrated sand core and a casting process.
Background
In the prior art, the structure of the axial flux disc type motor is generally a flat disc-shaped structure. Structurally, the front end cover and the rear end cover are directly butted, a middle shell is not arranged, the linear stator assemblies are arranged on the front end cover and the rear end cover on two sides, and cooling water channels are arranged in the end covers to meet the heat dissipation requirement of the linear stator assemblies. The sealing modes of arranging the cooling water channels on the end covers are various, such as O-shaped ring sealing, sealant sealing, integrated sand core casting and welding sealing modes and the like.
To integral type psammitolite casting welding sealing mode, the position of arranging sand is reserved in present design sets up unreasonablely, and the sand is arranged to the too little difficult sand that is left, and the welding cost is increased greatly to the too big thing that stays. Therefore, the position for reserving the sand discharge is very critical.
Disclosure of Invention
The invention aims to provide a disc type motor shell cast by an integrated sand core and a casting process, wherein the reserved sand discharging position is reasonable in design, sand is easy to discharge, and welding cost is not increased.
In order to solve the technical problem, the invention provides a disc type motor shell cast by an integrated sand core, which comprises a motor end cover, a built-in water channel and a water channel sealing plate;
the built-in water channel for cooling water circulation is arranged on the inner cavity wall of the motor end cover, and the motor end cover and the built-in water channel are an integrated casting;
a sand discharge groove is formed in the end face of the motor end cover and at least used for discharging the molding sand of the water channel sand core with the built-in water channel;
the water channel sealing plate is matched with the sand discharge groove and is arranged in the sand discharge groove of the motor end cover and is connected in a welding and sealing mode.
Preferably, in the above-described disc motor casing, the waterway seal plate has a closed circular ring, an open circular ring profile, a multiple circular ring or a segmental circular arc.
Preferably, in the above-described disc motor casing, the motor end cover and the waterway seal plate are welded by friction stir welding.
Preferably, in the above-described disc motor casing, a gap between the sand drain groove and the welding surface of the waterway sealing plate after assembly is 0.05mm to 0.2 mm.
Preferably, in the above-described disc motor casing, the built-in water passage includes a cooling passage and a water passage water inlet/outlet port exposed to an upper portion of an outer wall of the motor end cover.
Preferably, in the disc motor housing, the built-in water channel is arranged in a winding manner to form a hollow ring shape, and is attached to an end face of the motor end cover on the side close to the sand discharge groove.
The present invention also provides a casting process for a disc motor housing for casting a disc motor housing cast with an integral sand core as described above, the casting process comprising the steps of:
a. processing and manufacturing a water channel sand core and a sand discharge groove sand core;
b. placing the water channel sand core and the annular groove sand core in a casting motor shell mold to form a built-in water channel of the disc type motor shell to be cast, wherein one end surface of the annular groove sand core is attached to the inner wall of the casting motor shell mold, and the other end surface of the annular groove sand core is attached to the water channel sand core to form a sand discharge groove which is communicated with the outer side of the motor end cover and the built-in water channel;
c. filling metal liquid, and cooling and forming the metal liquid to form a motor shell intermediate;
d. and removing the sand discharge groove sand core and the water channel sand core to obtain the motor end cover with the built-in water channel.
Preferably, in the casting process, the step d is specifically: the water channel sand core is arranged at the center of the cast motor shell mold, the sand discharge groove sand core is removed from the end face of the motor shell intermediate to form the sand discharge groove, and the water channel sand core is removed through the sand discharge groove to obtain the motor end cover with the built-in water channel.
Preferably, in the casting process, in the step a, the sand discharge slot sand core and the waterway sand core are made of fine sand, or fine sand and resin in a mixed manner.
Preferably, in the casting process, in the step d, the sand discharge slot sand core and the water channel sand core are cleaned out of the motor casing intermediate body by means of heating, vibration and/or high-pressure flushing.
The disk motor casing that adopts the as cast integral type psammitolite that this scheme provided adopts the casting process to form the motor end cover of integral type casting structure, sets up built-in water course on the inner chamber wall, and motor end cover terminal surface sets up the sand discharge groove of external and motor end cover's built-in water course intercommunication, and sand discharge groove area is great, and the clearance that can be comparatively swift is arranged sand, and the water course closing plate embedding sand discharge inslot welded seal of same shape after the clearance of arranging sand is accomplished. The integrated casting design of the motor end cover is high in integration degree, the strength of the shell is improved, meanwhile, the built-in water channel is arranged on the inner cavity wall of the motor end cover and is not completely sealed before assembly, the sand discharge groove is arranged on the end face of the motor end cover to form a sand discharge channel, sand is easily removed from the die due to the design of the reserved sand discharge position, and the welding cost is not increased. This scheme still provides a casting process of using above-mentioned disc motor casing, arranges prefabricated water course psammitolite and sand discharge groove psammitolite in casting motor casing mould, only needs one shot forming can process out the motor casing midbody that has the psammitolite, clears away sand discharge groove psammitolite and water course psammitolite after, can obtain the motor end cover that has built-in water course, and casting process is simple, and the design of reserving the sediment discharge position in the above-mentioned structure makes the mould clear sand easily, easily seals, does not increase welding cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a front view of a disc motor housing provided with the present solution;
FIG. 2 is a cross-sectional view of the disk motor housing of FIG. 1 taken along direction A-A;
fig. 3 is a rear view of the disc motor housing provided by the present solution;
FIG. 4 is a schematic structural view of a built-in water channel provided by the present solution;
fig. 5 is a schematic structural diagram of a disc-type motor housing provided by the scheme;
FIG. 6 is a schematic structural view showing that the shape of the water passage sealing plate is a non-closed circular ring shape in the present embodiment;
FIG. 7 is a schematic structural view of the water channel sealing plate in a non-circular deformed shape according to the present invention;
FIG. 8 is a schematic structural view of the water channel sealing plate in the scheme, wherein the shape of the water channel sealing plate is in a multi-ring shape;
FIG. 9 is a schematic structural view showing the sectional arc shape of the sealing plate for the water passage in the present embodiment;
fig. 10 is a schematic structural view of a sealing plate with a built-in water channel and a water channel arranged on the inner end face of the motor end cover in the scheme.
In the upper diagram:
1-motor end cover, 101-sand discharge groove, 2-built-in water channel, 3-water channel sealing plate, 4-sealing welding position and 5-water channel water inlet and outlet.
Detailed Description
The core of the invention is to provide the disc type motor shell cast by the integrated sand core and the casting process, the reserved sand discharging position is reasonably designed, the sand discharging is easy, and the welding cost is not increased.
In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 10, fig. 1 is a front view of a disc motor housing according to the present invention; FIG. 2 is a cross-sectional view of the disk motor housing of FIG. 1 taken along direction A-A; fig. 3 is a rear view of the disc motor housing provided by the present solution; FIG. 4 is a schematic structural view of a built-in water channel provided by the present solution; fig. 5 is a schematic structural diagram of a disc-type motor housing provided by the scheme; fig. 6-10 are schematic structural views of different forms of water channel sealing plates in the disc type motor shell provided by the scheme. Fig. 6 is a schematic structural view illustrating a water channel sealing plate in a non-closed circular ring shape; FIG. 7 is a schematic structural diagram of a water channel sealing plate in a non-circular irregular shape; FIG. 8 is a schematic view of a waterway sealing plate in a multi-ring shape; FIG. 9 is a schematic view of a water passage sealing plate having a sectional arc shape; fig. 10 is a schematic view of the structure of the inner motor end cover with the built-in water channel and the water channel sealing plate (the sand discharge groove and the sealing weld are not marked on the inner end surface).
The invention provides a disc type motor shell cast by an integrated sand core, which comprises a motor end cover 1, a built-in water channel 2 and a water channel sealing plate 3;
the motor end cover 1 and the built-in water channel 2 are cast integrally, the built-in water channel 2 for cooling water circulation is arranged on the wall of an inner cavity of the motor end cover 1, a sand discharge groove 101 is formed in the end face of the motor end cover 1, and the sand discharge groove 101 is at least used for discharging molding sand of a water channel sand core of the built-in water channel 2. In the present embodiment, the sand discharge groove 101 functions to discharge the molding sand of the water channel core of the built-in water channel 2, but is not limited to this function. When other structures are provided in the motor end cover 1, similar molding sand may still need to be discharged through the sand discharge groove 101.
The water channel sealing plate 3 is matched with the sand discharge groove 101, and the water channel sealing plate 3 is arranged in the sand discharge groove 101 of the motor end cover 1 and is connected in a welding and sealing mode. Meanwhile, the inner end face of the motor end cover 1 is provided with a mounting position for a motor component, and the central part is provided with a mounting position for penetrating through the rotating shaft.
It should be noted that the sand discharge groove 101 is usually formed in an end surface of one side of the motor end cover 1, where two ends of the motor end cover 1 are close to the motor and are inner end surfaces, and two ends of the motor end cover 1 are outer end surfaces far away from the motor. Preferably, the sand discharge groove 101 is arranged on the outer end face of the motor end cover 1, and the built-in water channel 2 is arranged on the inner cavity wall of the motor end cover close to the outer end face, so that slight leakage can not cause the motor to fail. Of course, the sand discharge groove 101 may also be formed on the inner end surface of the motor end cover 1, and the built-in water channel 2 is formed on the inner cavity wall of the motor end cover close to the inner end surface.
The cast disk motor casing of integral type psammitolite that this scheme provided, adopt casting process formation integral type casting structure's motor end cover 1, set up built-in water course 2 on the wall of 1 inner chamber of motor end cover, the sand discharge groove 101 of the built-in water course 2 intercommunication of motor end cover 1 outside setting of 1 terminal surface of motor end cover, sand discharge groove 101 area is great, the clearance sand discharge that can be comparatively swift, weld in the sand discharge groove 101 with the 3 embedding sand discharge grooves of water course closing plate of same shape after the clearance of sand discharge is accomplished, can accomplish sealedly. The integrated design of motor end cover 1 and built-in water course 2, the integrated level is high, has improved casing intensity, and simultaneously, built-in water course setting is incomplete before the assembly at motor end cover inner chamber wall and the assembly seals, arranges sand groove 101 and sets up at motor end cover terminal surface, forms row's husky passageway, and the design of reserving row's husky position in the above-mentioned structure makes the mould clear sand easily, easily seals, and manual work and low in production cost do not increase the welding cost.
In a preferred embodiment, as shown in fig. 6-9, the shape of the waterway seal plate 3 can be derived into a closed circular ring, an unclosed circular ring, a non-circular ring profile, a multi-circular ring or a segmental circular arc, etc., according to actual requirements. Of course, the water channel sealing plate 3 with other annular structures or corresponding deformation structures can be adopted, and the deformation structure and the sand discharge groove are both in the protection range of the scheme according to the adaptability of practical application.
Preferably, the sand discharge groove 101 of the motor end cover 1 and the waterway sealing plate 3 are welded by friction stir welding. The friction stir welding has low welding cost and strong reliability for the regular routes. Thus, the built-in water channel can be sealed.
Specifically, the sand discharge groove 101 of the end cover and the water channel sealing plate 3 need to form a certain matching size in a machining mode, and a welding gap between the groove wall of the sand discharge groove 101 and the water channel sealing plate 3 on one side is set to be 0.05-0.2 mm, so that welding of the sand discharge groove and the water channel sealing plate is facilitated.
In a specific embodiment, as shown in fig. 2, 4 and 5, the built-in water channel 2 includes a cooling channel and a water channel water inlet/outlet 5, and the water channel water inlet/outlet 5 is exposed to an upper portion of an outer wall of the motor end cover 1. The motor end cover 1 is a hollow cylinder, a cooling channel is arranged on the end face side of the motor end cover 1, a water channel water inlet and water outlet 5 communicated with the cooling channel is arranged on the cylinder, water continuously flows into the cooling channel from the water inlet and then is discharged from the water outlet, the motor end cover is rapidly cooled and cooled, and the service life of the motor is prolonged.
As shown in fig. 4, the built-in water channel 2 is arranged in a winding way to form a hollow ring shape, and the built-in water channel 2 is similar to a serpentine pipe structure and is attached to the end surface of the motor end cover 1 close to the sand discharge groove 101. Of course, the built-in water channel 2 can also be arranged in a cylindrical shape and arranged along the circumferential direction of the motor end cover. Because the linear stator assembly is arranged on the front end cover and the rear end cover on the two sides, the cooling water channels are arranged in the end covers, so that the heat dissipation requirement of the linear stator assembly can be effectively improved. When the sand discharge groove 101 and the built-in water channel 2 are both symmetrical structures, the symmetrical center lines of the sand discharge groove 101 and the built-in water channel 2 are collinear, namely, the sand discharge groove and the built-in water channel 2 are coaxially arranged.
The invention also provides a casting process of the disc type motor shell, which is used for casting the disc type motor shell cast by the integral sand core, and the casting process comprises the following steps:
a. processing and manufacturing a water channel sand core and a sand discharge groove sand core;
b. placing the water channel sand core and the sand discharge groove sand core in a casting motor shell mold to form a built-in water channel 2 of the disc type motor shell to be cast, wherein one end surface of the sand discharge groove sand core is attached to the inner wall of the casting motor shell mold, and the other end surface of the sand discharge groove sand core is attached to the water channel sand core to form a sand discharge groove 101 communicating the outer side of the motor end cover and the built-in water channel 2;
c. filling metal liquid, and cooling and forming the metal liquid to form a motor shell intermediate;
d. and removing sand cores of the sand discharge groove and sand cores of the water channel to obtain the motor end cover 1 with the built-in water channel 2.
By adopting the casting process, the prefabricated water channel sand core and the sand discharge groove sand core are arranged in the casting motor shell mold, the motor shell intermediate can be processed only through one-step forming, meanwhile, the sand discharge groove sand core and the water channel sand core are removed, the motor end cover 1 with the built-in water channel 2 is obtained, the casting process is simple, and the design of reserving the sand discharge position in the structure enables the mold to be easy to clean sand, easy to seal and free of increase of welding cost.
It should be noted that the molten metal in step c may be specifically aluminum liquid, and is obtained by melting an aluminum ingot. Of course, one or more metals, such as aluminum alloy, can be selected as the processing material, and the mass percentages of the element components can be configured according to the actual application and are all within the protection scope of the scheme.
Preferably, the water channel sand core is arranged at the center of the casting motor shell mold, the water channel sand core can be designed into a central symmetrical structure and is arranged in the center of the mold, casting is facilitated, and the cooling and heat dissipation effects can be effectively improved. Of course, the water channel sand core can be designed to be in an asymmetric structure according to actual requirements.
Further, step d specifically includes: and removing sand cores of the sand discharge groove from the end surface of the motor shell intermediate to form the sand discharge groove 101, and removing sand cores of the water channel through the sand discharge groove 101 to obtain the motor end cover 1 with the built-in water channel 2.
Specifically, in the step a, the sand drain slot sand core and the waterway sand core are made of fine sand or fine sand and resin by mixing. The fine sand is added with a small amount of resin and curing agent to be stirred and mixed, which is beneficial to improving the quality of the casting and reducing the defects of vein, mechanical sand adhesion and the like.
Specifically, in step d, the sand drain slot core and the waterway core are cleaned from the motor housing intermediate body by means of heating, vibration and/or high pressure flushing. After cleaning, the motor end cover of the built-in casting integrated water channel is formed.
The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The disc type motor shell cast by the integrated sand core is characterized by comprising a motor end cover (1), a built-in water channel (2) and a water channel sealing plate (3);
the built-in water channel (2) for cooling water to flow through is arranged on the inner cavity wall of the motor end cover (1), and the motor end cover (1) and the built-in water channel (2) are an integrated casting;
a sand discharge groove (101) is formed in the end face of the motor end cover (1), and the sand discharge groove (101) is at least used for discharging the molding sand of the water channel sand core of the built-in water channel (2);
the water channel sealing plate (3) is matched with the sand discharge groove (101), and the water channel sealing plate (3) is arranged in the sand discharge groove (101) of the motor end cover (1) and is connected in a welding and sealing mode.
2. The disc motor housing according to claim 1, wherein the waterway seal plate (3) is shaped as a closed circular ring, an open circular ring profile, a multi-circular ring, or a segmented circular arc.
3. The disc motor housing according to claim 1, wherein the motor end cover (1) and the waterway seal plate (3) are welded by friction stir welding.
4. The disc motor housing according to claim 1, wherein a gap between the bonded surfaces of the drain groove (101) and the waterway seal plate (3) is 0.05mm to 0.2mm after assembly.
5. The disc motor housing according to claim 1, wherein the built-in water passage (2) includes a cooling passage and a water passage inlet/outlet port (5), the water passage inlet/outlet port (5) being exposed to an upper portion of an outer wall of the motor end cover (1).
6. The disc motor housing according to any one of claims 1 to 5, wherein the built-in water channel (2) is arranged in a winding manner to form a hollow ring shape and is attached to an end face of the motor end cover (1) on a side close to the sand discharge groove (101).
7. A casting process of a disc motor housing for casting a disc motor housing cast by an integral sand core as claimed in any one of claims 1 to 6, the casting process comprising the steps of:
a. processing and manufacturing a water channel sand core and a sand discharge groove sand core;
b. placing the water channel sand core and the annular groove sand core in a casting motor shell mold to form a built-in water channel (2) of the disc type motor shell to be cast, wherein one end surface of the annular groove sand core is attached to the inner wall of the casting motor shell mold, and the other end surface of the annular groove sand core is attached to the water channel sand core to form a sand discharge groove (101) communicating the outer side of the motor end cover with the built-in water channel (2);
c. filling metal liquid, and cooling and forming the metal liquid to form a motor shell intermediate;
d. and removing the sand discharge groove sand core and the water channel sand core to obtain the motor end cover (1) with the built-in water channel (2).
8. The casting process according to claim 7, wherein step d is in particular: the water channel sand core is arranged at the center of the cast motor shell mold, the sand discharge groove sand core is removed from the end face of the motor shell intermediate to form the sand discharge groove (101), and the water channel sand core is removed through the sand discharge groove (101) to obtain the motor end cover (1) with the built-in water channel (2).
9. The casting process according to claim 7, wherein in the step a, the sand drain slot sand core and the water channel sand core are manufactured by using fine sand or mixing fine sand and resin.
10. The casting process according to claim 7, wherein in step d, the drain slot core and the waterway core are cleaned from the motor housing intermediate body by heating, vibration, and/or high pressure flushing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010837719.6A CN111864968A (en) | 2020-08-19 | 2020-08-19 | Integrated sand core cast disc type motor shell and casting process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010837719.6A CN111864968A (en) | 2020-08-19 | 2020-08-19 | Integrated sand core cast disc type motor shell and casting process |
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| Publication Number | Publication Date |
|---|---|
| CN111864968A true CN111864968A (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010837719.6A Pending CN111864968A (en) | 2020-08-19 | 2020-08-19 | Integrated sand core cast disc type motor shell and casting process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114189092A (en) * | 2021-11-20 | 2022-03-15 | 重庆虎溪电机工业有限责任公司 | Novel water channel structure of water-cooled motor and manufacturing method |
| US11462977B2 (en) * | 2020-06-05 | 2022-10-04 | Teco Electric & Machinery Co., Ltd. | Closed-type liquid cooling motor frame and method for manufacturing the same |
-
2020
- 2020-08-19 CN CN202010837719.6A patent/CN111864968A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11462977B2 (en) * | 2020-06-05 | 2022-10-04 | Teco Electric & Machinery Co., Ltd. | Closed-type liquid cooling motor frame and method for manufacturing the same |
| CN114189092A (en) * | 2021-11-20 | 2022-03-15 | 重庆虎溪电机工业有限责任公司 | Novel water channel structure of water-cooled motor and manufacturing method |
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