CN111245114B - A motor core based on metal 3D printing technology and its manufacturing method - Google Patents
A motor core based on metal 3D printing technology and its manufacturing method Download PDFInfo
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- CN111245114B CN111245114B CN202010062461.7A CN202010062461A CN111245114B CN 111245114 B CN111245114 B CN 111245114B CN 202010062461 A CN202010062461 A CN 202010062461A CN 111245114 B CN111245114 B CN 111245114B
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- core
- shell
- powder
- rotor
- soft magnetic
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- 238000010146 3D printing Methods 0.000 title claims abstract description 29
- 238000005516 engineering process Methods 0.000 title claims abstract description 28
- 239000002184 metal Substances 0.000 title claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 26
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000006247 magnetic powder Substances 0.000 claims abstract description 48
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000011258 core-shell material Substances 0.000 claims abstract description 44
- 239000000843 powder Substances 0.000 claims abstract description 41
- 239000002245 particle Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical group [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000007639 printing Methods 0.000 claims description 4
- 229910000676 Si alloy Inorganic materials 0.000 claims description 3
- YFELMWJRIDJCTN-UHFFFAOYSA-N [O-2].[Fe+2].[Si+4].[O-2].[O-2] Chemical compound [O-2].[Fe+2].[Si+4].[O-2].[O-2] YFELMWJRIDJCTN-UHFFFAOYSA-N 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 2
- 238000007254 oxidation reaction Methods 0.000 claims description 2
- 230000035699 permeability Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 241000237983 Trochidae Species 0.000 description 2
- UCNNJGDEJXIUCC-UHFFFAOYSA-L hydroxy(oxo)iron;iron Chemical compound [Fe].O[Fe]=O.O[Fe]=O UCNNJGDEJXIUCC-UHFFFAOYSA-L 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
本发明公开了一种基于金属3D打印技术的电机铁心及其制造方法，包括相互配合的定子铁心和转子铁心，定子铁心包括定子铁心外壳和定子铁心内壳，定子铁心内壳沿圆周均匀形成多个向外凸出的定子槽；定子铁心外壳和定子铁心内壳之间围合成用于容纳氧化软磁粉末的定子铁心槽；转子铁心包括转子铁心外壳和转子铁心内壳，沿转子铁心外壳内周设有多个均匀分布的一字型内槽；转子铁心外壳和转子铁心内壳之间一字型内槽以外的部分设有不同规格氧化软磁粉末。本发明在铁心内部不同槽中填充不同规格的氧化软磁粉末，通过调节粉末的颗粒大小来减小电机涡流损耗；通过调节铁心槽中粉末的疏松度，可以调节电机铁心导磁性能、优化电机磁路，从而提高电机性能。
The invention discloses a motor iron core based on metal 3D printing technology and a manufacturing method thereof, comprising a stator iron core and a rotor iron core which cooperate with each other. A stator slot protruding outwards; a stator core slot for accommodating the oxidized soft magnetic powder is enclosed between the stator core shell and the stator core inner shell; the rotor core includes a rotor core shell and a rotor core inner shell, along the inner surface of the rotor core shell The circumference is provided with a plurality of evenly distributed in-line grooves; the parts other than the in-line inner grooves between the outer shell of the rotor iron core and the inner shell of the rotor iron core are provided with oxidized soft magnetic powders of different specifications. The invention fills the different slots of the iron core with oxidized soft magnetic powder of different specifications, and reduces the eddy current loss of the motor by adjusting the particle size of the powder; and by adjusting the looseness of the powder in the iron core slot, the magnetic permeability of the motor iron core can be adjusted and the motor can be optimized. magnetic circuit, thereby improving motor performance.
Description
Technical Field
The invention relates to a motor iron core, in particular to a motor iron core based on a metal 3D printing technology and a manufacturing method thereof.
Background
The traditional manufacturing method of the motor iron core mainly comprises a single-piece punching method and a splicing method. Both methods need to punch silicon steel sheets first, then laminate and splice, and finally complete welding, and the process is complex, the manufacture of the iron core with a complex shape is difficult, the universality of the die is not high, a large number of dies are needed, and the price is high.
In recent years, metal three-dimensional printing technology is rapidly developed, the three-dimensional printing technology which adopts a high energy source such as selective laser melting, sintering, electron beam melting and the like is the most mature, the rapid manufacturing of refractory and difficult-to-process metal materials can be realized, the method has wide application prospects in the fields of die manufacturing, aerospace, vehicles, medicine and the like, and a new idea is provided for manufacturing motor iron cores. After the metal three-dimensional printing technology is adopted, because the motor iron core is printed into a whole, the eddy current loss of the motor is increased along with the printing, and how to reduce the eddy current loss of the motor becomes a difficult point.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a motor iron core with low eddy current loss based on a metal 3D printing technology; a second object of the present invention is to provide a method for manufacturing a motor core based on a metal 3D printing technique, which can reduce eddy current loss.
The technical scheme is as follows: the invention discloses a motor iron core based on a metal 3D printing technology, which comprises a stator iron core and a rotor iron core which are matched with each other, and is characterized in that: the stator core comprises a stator core shell, the stator core shell consists of a stator core outer shell and a stator core inner shell, and the stator core inner shell uniformly forms a plurality of stator slots which protrude outwards and are used for placing windings along the circumference; a stator core slot for containing the oxidized soft magnetic powder is enclosed between the stator core outer shell and the stator core inner shell;
the rotor core comprises a rotor core shell, the rotor core shell consists of a rotor core outer shell and a rotor core inner shell, the rotor core inner shell is arranged in the rotor core outer shell, and a plurality of uniformly distributed linear inner grooves for placing permanent magnets are formed along the inner periphery of the rotor core outer shell; the parts outside the straight-line-shaped inner groove between the rotor core outer shell and the rotor core inner shell are filled with different specifications of oxidized soft magnetic powder.
Two side surfaces of the straight-shaped inner groove extend to the inner wall of the rotor core shell to form a first inner groove; two long edges of two adjacent linear inner grooves, which are close to one side of the rotor core inner shell, are connected, and a second inner groove is formed by the two long edges, the inner wall of the rotor core outer shell and two side surfaces of the two adjacent linear inner grooves in a surrounding mode; the space enclosed by the rotor core inner shell, the linear inner groove and the second inner groove is a third inner groove, and different specifications of oxidized soft magnetic powder can be filled in different grooves.
The stator core slot, the first inner slot, the second inner slot and the third inner slot are respectively filled with soft magnetic oxide powder with different specifications, and the loose degrees of the soft magnetic oxide powder filled in the stator core slot, the first inner slot, the second inner slot and the third inner slot are different; the eddy current loss of the motor is reduced by adjusting the size of the oxidized soft magnetic powder particles, and the magnetic conductivity of the motor core can be adjusted by adjusting the porosity of the oxidized soft magnetic powder in different grooves.
The thickness of the stator iron core shell and the rotor iron core shell is adjustable, the heat conduction performance is good, and the heat dissipation area is large.
The oxidized soft magnetic powder is iron oxide powder or iron oxide silicon alloy powder.
The top of the stator core shell is provided with a first powder containing hole, the top of the rotor core shell is provided with a plurality of powder containing holes corresponding to the first inner groove, the second inner groove and the third inner groove, and the oxidized soft magnetic powder is filled into each groove through the powder containing holes.
The stator core shell and the rotor core shell are made by adopting a metal 3D printing technology, the production process is simple, the production period is short, and the utilization rate of materials is improved.
The invention relates to a manufacturing method of a motor iron core based on a 3D printing technology, which comprises the following steps:
(1) establishing a three-dimensional model of the motor iron core by a metal 3D printing technology, and reserving powder filling holes at positions needing to be filled with oxidized soft magnetic powder in the stator iron core shell and the rotor iron core shell;
(2) after printing is finished, pouring out the residual soft magnetic powder in the stator core shell and the rotor core shell;
(3) determining the optimal particle specification for reducing the eddy current loss by oxidizing the soft magnetic powder through experiments;
(4) determining the porosity of the oxidized soft magnetic powder at each part of the iron core through calculation;
(5) filling the iron core with oxidized soft magnetic powder;
(6) and closing the powder containing hole.
And (3) after filling different oxidized soft magnetic powder with different specifications in different powder filling holes, introducing rated current to the motor under the same experimental condition, and measuring the temperature rise of the rotor through a temperature sensor to find out the specification of the oxidized soft magnetic powder which enables the temperature rise of the rotor of the motor to be minimum.
In the step (4), the porosity calculation formula of the oxidized soft magnetic powder is specifically as follows:
in the formula, mnDenotes the mass of the oxidized powder in the nth powder vessel, VnThe volume of the nth powder groove is shown.
Has the advantages that: compared with the prior art, the invention has the beneficial effects that: (1) soft magnetic powder materials such as iron oxide powder with different porosities are filled in different grooves in the iron core, and the eddy current loss of the motor can be effectively reduced by adjusting the particle size of the powder; (2) the magnetic conductivity of the motor iron core can be adjusted and the magnetic circuit of the motor can be optimized by adjusting the looseness of powder at different parts of the iron core, so that the performance of the motor is improved; (3) the eddy current loss is basically concentrated on the iron core shell, but the thickness of the iron core shell can be adjusted, the heat conduction performance is good, and the heat dissipation area is large; (4) the iron core is printed by adopting a metal three-dimensional printing technology, the production process is simple, the production period is short, and the utilization rate of materials is improved.
Drawings
FIG. 1 is a schematic structural diagram of an electrical machine core according to the present invention;
FIG. 2 is a schematic structural diagram of a stator core of an electric machine according to the present invention;
FIG. 3 is a schematic structural diagram of a rotor core of an electric machine according to the present invention;
FIG. 4 is a radial cross-sectional view of a stator core of an electric machine in accordance with the present invention;
fig. 5 is a radial sectional view of a rotor core of an electric machine according to the present invention.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and the attached drawing figures.
As shown in fig. 1 to 3, the present invention includes a stator core and a rotor core, both the stator core and the rotor core are of a hollow structure, the stator core is sleeved outside the rotor core, an air gap is provided between the stator core and the rotor core, as shown in fig. 3, the stator core includes a stator core housing 1 printed by a metal 3D printing technology, the stator core housing 1 includes a stator core outer housing 11 and a stator core inner housing 12, the stator core inner housing 12 is disposed inside the stator core outer housing 11 and concentrically disposed with the stator core outer housing 12, the stator core inner housing 12 uniformly forms a plurality of stator slots 13 along a circumference, and stator teeth are formed between two adjacent stator slots 13, in this embodiment, the number of the plurality of stator slots 13 is 12, and a winding is provided in the plurality of stator slots 13; a gap portion between the stator core outer shell 11 and the stator core inner shell 12 forms a stator core slot 14; as shown in fig. 1, a top shell is arranged at the top of a stator core shell 1, and a first powder containing hole 15 is formed in the top shell and positioned right above a stator core slot 14;
as shown in fig. 4, the rotor core includes a rotor core housing 2 printed by a metal 3D printing technology, the rotor core housing 2 includes a rotor core outer shell 21 and a rotor core inner shell 22, the rotor core inner shell 22 is disposed inside the rotor core outer shell 21 and concentrically disposed with the rotor core outer shell, and a plurality of linear inner grooves 23 are uniformly distributed along the inner circumference of the rotor core outer shell 21, in this embodiment, the number of the linear inner grooves 23 is 6, and the linear inner grooves are all used for placing permanent magnets; two side surfaces of the straight-shaped inner groove 23 extend to the inner wall of the rotor core housing 21 to form a first inner groove 24; two long sides of two adjacent linear inner grooves 23 close to one side of the rotor core inner shell 22 are connected, and form a second inner groove 25 together with the inner wall of the rotor core outer shell 21 and the short sides of the two adjacent linear inner grooves 23; the space enclosed by the rotor core inner shell 22, the straight inner groove 23, and the second inner groove 25 is a third inner groove 26. In this embodiment, the stator core housing 1 and the rotor core housing 2 have adjustable thicknesses, good thermal conductivity, and a large heat dissipation area, and the stator core housing 1 and the rotor core housing 2 are formed of core straps having a certain width. As shown in fig. 2, a top case is provided on the top of the rotor core housing 2, a second powder filling hole 27 is formed right above each first inner groove 24, a third powder filling hole 28 is formed right above each second inner groove 25, and a fourth powder filling hole 29 is formed right above each third inner groove 25.
The invention relates to a manufacturing method of a motor iron core structure based on a 3D printing technology, which specifically comprises the following steps:
(1) establishing a three-dimensional model of the motor iron core by a metal 3D printing technology, and reserving powder filling holes at positions needing to be filled with oxidized soft magnetic powder in the stator iron core shell and the rotor iron core shell;
(2) after printing is finished, pouring out the residual soft magnetic powder in the stator core shell and the rotor core shell;
(3) determining the optimal particle specification for reducing the eddy current loss by oxidizing the soft magnetic powder through experiments;
(4) determining the porosity of the oxidized soft magnetic powder at each part of the iron core through calculation;
(5) filling the iron core with oxidized soft magnetic powder;
(6) and closing the powder containing hole.
In the step (3), after the oxidized soft magnetic powder with different specifications is filled in different powder filling holes, under the same experimental conditions, rated current is introduced into the motor, and the temperature rise of the rotor is measured by the temperature sensor, so that the oxidized soft magnetic powder with the minimum temperature rise of the rotor of the motor is found out.
In the step (4), the porosity calculation formula of the oxidized soft magnetic powder is specifically as follows:
mnthe n-th powder groove is filled with oxidized soft magnetic powderMass of powder, VnThe volume of the nth powder groove. In the present embodiment, the porosity of the oxidized soft magnetic powder in second inner groove 25 is greater than the porosity of the oxidized soft magnetic powder in first inner groove 24, and the porosity of the oxidized soft magnetic powder in first inner groove 24 is greater than the porosity of the oxidized soft magnetic powder in third inner groove 26.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010062461.7A CN111245114B (en) | 2020-01-20 | 2020-01-20 | A motor core based on metal 3D printing technology and its manufacturing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010062461.7A CN111245114B (en) | 2020-01-20 | 2020-01-20 | A motor core based on metal 3D printing technology and its manufacturing method |
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| CN111245114A CN111245114A (en) | 2020-06-05 |
| CN111245114B true CN111245114B (en) | 2021-08-31 |
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| CN202010062461.7A Active CN111245114B (en) | 2020-01-20 | 2020-01-20 | A motor core based on metal 3D printing technology and its manufacturing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111564917A (en) * | 2020-06-08 | 2020-08-21 | 南京师范大学 | Motor rotor structure based on metal 3D printing technology |
| CN111769675B (en) * | 2020-06-22 | 2021-06-08 | 南京师范大学 | Motor based on liquid metal coil, manufacturing method and speed regulation method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102013221965A1 (en) * | 2013-10-29 | 2015-04-30 | Volkswagen Aktiengesellschaft | Process for producing a molded part and electric machine with such a molded part |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1166713A (en) * | 1997-01-30 | 1997-12-03 | 职统磊 | Resin-iron powder stator for electric motor and its production method |
| CN105262247B (en) * | 2015-10-22 | 2019-03-01 | 珠海格力电器股份有限公司 | Stator core structure assembly, motor, compressor and air conditioner |
| KR102453826B1 (en) * | 2017-09-05 | 2022-10-12 | 현대자동차주식회사 | Light weight partition motor and production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102013221965A1 (en) * | 2013-10-29 | 2015-04-30 | Volkswagen Aktiengesellschaft | Process for producing a molded part and electric machine with such a molded part |
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