CN112953156B - Cylindrical permanent magnet linear motor adopting mixed material stator magnetic core - Google Patents
Cylindrical permanent magnet linear motor adopting mixed material stator magnetic core Download PDFInfo
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- CN112953156B CN112953156B CN202110422642.0A CN202110422642A CN112953156B CN 112953156 B CN112953156 B CN 112953156B CN 202110422642 A CN202110422642 A CN 202110422642A CN 112953156 B CN112953156 B CN 112953156B
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- silicon steel
- magnetic core
- stator
- core
- permanent magnet
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- 239000000463 material Substances 0.000 title claims abstract description 15
- 229910000976 Electrical steel Inorganic materials 0.000 claims abstract description 70
- 239000002131 composite material Substances 0.000 claims abstract description 42
- 238000004804 winding Methods 0.000 claims abstract description 21
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 4
- 238000010030 laminating Methods 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 2
- 238000000748 compression moulding Methods 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 229910000859 α-Fe Inorganic materials 0.000 claims description 2
- 230000004907 flux Effects 0.000 abstract description 21
- 230000035699 permeability Effects 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 150000003376 silicon Chemical class 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/02—Details of the magnetic circuit characterised by the magnetic material
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
- H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electromagnetism (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention discloses a cylindrical permanent magnet linear motor adopting a mixed material stator magnetic core, which adopts a mixed structure of silicon steel sheets and soft magnetic composite materials as the stator magnetic core of the motor, changes the stacking direction of the silicon steel sheets in the traditional motor, avoids eddy current loss caused by the fact that magnetic flux vertically passes through the axially stacked silicon steel sheets, fills soft magnetic composite materials in the circumferential residual space, improves the utilization rate of windings, and provides more magnetic flux paths. Compared with a magnetic core made of a soft magnetic composite material, the magnetic core is made of the silicon steel sheets which are stacked tangentially, the defect of low magnetic permeability of the soft magnetic composite material is overcome, and the magnetic permeability on a magnetic flux path is improved.
Description
Technical Field
The invention relates to the technical field of cylindrical permanent magnet linear motors, in particular to a cylindrical permanent magnet linear motor adopting a mixed material stator magnetic core.
Background
In a traditional cylindrical permanent magnet linear motor, a motor magnetic core is mostly formed by stacking silicon steel sheets along the axial direction of the motor. However, during the operation of the motor, the magnetic flux path is perpendicular to the silicon steel sheet in the axial direction, namely, the magnetic flux vertically passes through the silicon steel sheet, so that a large amount of eddy current loss can be generated in the magnetic core of the motor in a high-frequency changing magnetic field according to Faraday electromagnetic induction law, the operation efficiency of the motor is reduced, meanwhile, the eddy current loss causes serious heating of the motor, and the permanent magnet has the risk of demagnetization at a high temperature. With the development of new magnetic materials, soft magnetic composite materials are increasingly applied to motor design and manufacturing. The soft magnetic composite material is metal particles coated by an insulating layer and manufactured by a powder metallurgy technology, and can be directly pressed into a structure required by a motor magnetic core by a mould pressing technology. The material has the characteristics of small eddy current loss and magnetic and thermal isotropy, so that the material is suitable for motors with complex structures, in particular to three-dimensional magnetic circuits. In the traditional cylindrical permanent magnet linear motor, the soft magnetic composite material is adopted to manufacture the magnetic core of the motor, the problem of eddy current loss generated by adopting a silicon steel sheet material is solved, the magnetic core can be formed by pressing a die, and in mass production, the processing and manufacturing cost can be greatly reduced. However, the soft magnetic composite material has certain defects, and the material has lower magnetic permeability, larger hysteresis loss and is not ideal in a motor with lower operating frequency.
Disclosure of Invention
In order to overcome the defects in the original motor, the invention provides a cylindrical permanent magnet linear motor adopting a mixed material stator magnetic core. According to the motor, the silicon steel sheet and the soft magnetic composite material are used as the stator magnetic core in a mixed mode, the stacking direction of the silicon steel sheet is changed, so that magnetic flux can pass through the surface of the silicon steel sheet in the axial direction, and eddy current loss caused by the fact that the magnetic flux vertically passes through the silicon steel sheet is avoided. Meanwhile, the space which is not fully laminated by the silicon steel sheets is supplemented by utilizing the three-dimensional magnetic conductivity of the soft magnetic composite material so as to increase the path of magnetic flux.
The technical scheme for solving the technical problems is that the cylindrical permanent magnet linear motor adopting the mixed material stator core is designed and is characterized by comprising a stator core, a rotor core, a permanent magnet and armature windings, wherein the stator core is cylindrical, a plurality of annular channels taking the axis of the stator core as the axis are uniformly arranged on the inner surface of the stator core towards the outer surface, and the armature windings are arranged in each annular channel;
the rotor magnetic core is also cylindrical, the length of the rotor magnetic core is longer than that of the stator magnetic core, a plurality of annular permanent magnets with the same radial thickness and the same axial width are sleeved on the outer surface of the rotor magnetic core along the axial direction, the permanent magnets are fully distributed on the outer surface of the rotor magnetic core, and the rotor magnetic core and the permanent magnets are tightly connected through an adhesive; the rotor magnetic core sleeved with the permanent magnet is arranged in the stator magnetic core and is coaxial, and a circle of air gap is arranged between the inner surface of the stator magnetic core and the outer surface of the permanent magnet;
The stator magnetic core comprises silicon steel sheet units and soft magnetic composite material units, the number of the silicon steel sheet units is the same as that of the soft magnetic composite material units, the structures and the sizes of the same units are the same, and the same units are separated by another unit and are spliced circumferentially to form a complete cylinder; the silicon steel sheet unit is formed by laminating, bonding, fastening and connecting a plurality of silicon steel sheets, cutting and forming, wherein the inner side surface and the outer side surface of the silicon steel sheet unit are two curved surfaces, the other side surfaces are planes, and the inner side surface of the silicon steel sheet unit is provided with a notch for installing an armature winding;
The inner side surface and the outer side surface of the silicon steel sheet unit are part of the inner side surface and the outer side surface of the stator magnetic core respectively; the inner side surface and the outer side surface of the soft magnetic composite material unit are also two curved surfaces, the arc length of the inner side surface is shorter than that of the outer side surface, and the inner side surface is also provided with a notch which is matched with the notch on the silicon steel sheet unit; the two rectangular silicon steel sheets and the silicon steel sheet unit and the soft magnetic composite material unit are fastened and connected through an adhesive.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts the mixed structure of the silicon steel sheets and the soft magnetic composite material as the stator magnetic core of the motor, changes the stacking direction of the silicon steel sheets in the traditional motor, avoids the eddy current loss caused by the magnetic flux vertically passing through the axially stacked silicon steel sheets, fills the soft magnetic composite material in the circumferential residual space, improves the utilization rate of the winding, and provides more magnetic flux paths. Compared with a magnetic core made of a soft magnetic composite material, the magnetic core is made of the silicon steel sheets which are stacked tangentially, the defect of low magnetic permeability of the soft magnetic composite material is overcome, and the magnetic permeability on a magnetic flux path is improved.
Drawings
FIG. 1 is a schematic perspective view of an embodiment of the motor of the present invention (a single sheet of silicon steel is extremely thin, less than 0.5mm, so the silicon steel unit is shown as a whole, hereinafter the same);
FIG. 2 is a schematic perspective view of a stator core of an embodiment of the motor of the present invention;
FIG. 3 is a schematic axial view of a stator core of an embodiment of an electric machine according to the present invention;
Fig. 4 is a schematic perspective view of a silicon steel sheet unit according to an embodiment of the motor of the present invention;
FIG. 5 is a schematic perspective view of a soft magnetic composite unit according to an embodiment of the motor of the present invention;
fig. 6 is a schematic view of a lamination mode of silicon steel sheets of a silicon steel sheet unit of an embodiment of the motor of the invention (axial view, which is only for illustrating the lamination mode);
FIG. 7 is a schematic diagram of the axial flux path and eddy currents generated by a conventional motor stator core;
FIG. 8 is a schematic diagram of the axial flux path and eddy currents generated by the motor stator core of the present invention;
The reference numerals are as follows:
Wherein: 1-a silicon steel sheet unit; 2-a soft magnetic composite unit; 3-armature winding; 4-permanent magnets; 5-a mover core; a-a stator yoke; b-stator teeth.
Detailed Description
For a further understanding of the invention, embodiments of the invention are described further below with reference to the drawings.
The invention provides a cylindrical permanent magnet linear motor (refer to a motor for short) adopting a mixed material stator core, which comprises a stator core, a rotor core, permanent magnets and armature windings, wherein the stator core is cylindrical, a plurality of annular channels taking the axis of the stator core as the axis are uniformly arranged on the inner surface of the stator core towards the direction of the outer surface, and each annular channel is internally provided with the armature windings;
The rotor magnetic core is also cylindrical, the length of the rotor magnetic core is longer than that of the stator magnetic core, a plurality of annular permanent magnets with the same radial thickness and the same axial width are sleeved on the outer surface of the rotor magnetic core along the axial direction, the permanent magnets are fully distributed on the outer surface of the rotor magnetic core, and the rotor magnetic core and the permanent magnets are tightly connected through an adhesive; the rotor magnetic core sleeved with the permanent magnet is arranged in the stator magnetic core and is coaxial, and a circle of air gap is arranged between the inner surface of the stator magnetic core and the outer surface of the permanent magnet.
The stator magnetic core comprises silicon steel sheet units and soft magnetic composite material units, the number of the silicon steel sheet units is the same as that of the soft magnetic composite material units, the structures and the sizes of the same units are the same, and the same units are separated by another unit and are spliced circumferentially to form a complete cylinder. The silicon steel sheet unit is formed by laminating, bonding, fastening and connecting a plurality of silicon steel sheets, cutting and forming, wherein the inner side surface and the outer side surface of the silicon steel sheet unit are two curved surfaces, the other side surfaces of the silicon steel sheet unit are planes, and the inner side surface of the silicon steel sheet unit is provided with a notch for installing an armature winding. Specifically, the silicon steel sheet unit can be obtained by: firstly, a plurality of silicon steel sheets are respectively cut into notches with the same groove width as the annular groove on the inner side of the stator magnetic core, then the silicon steel sheets are inserted into the annular mold with the same size as the annular groove one by one through the opening, and meanwhile, the silicon steel sheets are bonded by using an adhesive, and the stacking width of the silicon steel sheets is limited to be the design width. And then, performing linear cutting on the front side and the rear side of the silicon steel sheet to form two parallel curved surfaces on the inner side and the outer side of the laminated silicon steel sheet to form a silicon steel sheet unit.
The inner side surface and the outer side surface of the silicon steel sheet unit are part of the inner side surface and the outer side surface of the stator magnetic core respectively. The inner side surface and the outer side surface of the soft magnetic composite material unit are also two curved surfaces, the arc length of the inner side surface is shorter than that of the outer side surface, and the inner side surface of the soft magnetic composite material unit is also provided with a notch which is matched with the notch on the silicon steel sheet unit. The two rectangular silicon steel sheets and the silicon steel sheet unit and the soft magnetic composite material unit are fastened and connected through an adhesive.
Specifically, as shown in fig. 1, as an example, the stator core includes five silicon steel sheet units 1 and five soft magnetic composite material units 2, which are circumferentially spliced to form a complete cylindrical stator core.
In the embodiment, the widths of the annular grooves at the two ends of the inner part of the stator magnetic core are the same and are half of the widths of the annular grooves at the middle part, and an armature winding is respectively arranged in each annular groove at the two ends; two armature windings are respectively arranged in the annular channels in the middle, and the two armature windings are insulated.
The rotor magnetic core 5 is made of soft magnetic composite material and is formed by compression molding.
The soft magnetic composite material unit 2 is obtained by molding a soft magnetic composite material.
The permanent magnet 4 is made of ferrite material, and the armature winding 3 is copper wire.
The soft magnetic composite material is 7003P in model number.
The working principle of the motor is as follows: the rotor magnetic core 5 is sleeved and fixed on the shaft, the stator magnetic core is sleeved on the outer side face of the rotor magnetic core 5 and is coaxial with the rotor magnetic core 5, a circle of air gap is reserved between the rotor magnetic core and the stator magnetic core, and the stator magnetic core is fixed on the base through the mounting accessory. When the motor operates, the rotor magnetic core 5 moves linearly along the axial direction, magnetic flux flows out of the permanent magnet, enters the stator tooth part through the air gap, flows out of the adjacent stator tooth part through the stator yoke part, and returns to the permanent magnet through the air gap. The main magnetic flux comprises radial and axial magnetic fluxes, the radial magnetic flux passes through the stator tooth part of the silicon steel sheet, the axial magnetic flux passes through the stator yoke part of the silicon steel sheet and is parallel to the surface of the silicon steel sheet, so that eddy current loss caused by the fact that the axial magnetic flux of the yoke part vertically passes through the silicon steel sheet when the silicon steel sheet is overlapped in the traditional axial direction is avoided, the utilization rate of the winding is improved by filling soft magnetic composite materials in the circumferential residual space, and more magnetic flux paths are provided. Compared with a stator magnetic core completely made of soft magnetic composite materials, the stator magnetic core is added with tangentially-overlapped silicon steel sheets, so that the defect of low magnetic permeability of the soft magnetic composite materials is overcome, and the magnetic permeability on a magnetic flux path is improved.
The invention is applicable to the prior art where it is not described.
Claims (7)
1. The cylindrical permanent magnet linear motor adopting the mixed material stator core is characterized by comprising a stator core, a rotor core, permanent magnets and armature windings, wherein the stator core is cylindrical, a plurality of annular grooves taking the axis of the stator core as the axis are uniformly formed in the inner surface of the stator core towards the outer surface, and the armature windings are arranged in each annular groove;
the rotor magnetic core is also cylindrical, the length of the rotor magnetic core is longer than that of the stator magnetic core, a plurality of annular permanent magnets with the same radial thickness and the same axial width are sleeved on the outer surface of the rotor magnetic core along the axial direction, the permanent magnets are fully distributed on the outer surface of the rotor magnetic core, and the rotor magnetic core and the permanent magnets are tightly connected through an adhesive; the rotor magnetic core sleeved with the permanent magnet is arranged in the stator magnetic core and is coaxial, and a circle of air gap is arranged between the inner surface of the stator magnetic core and the outer surface of the permanent magnet;
The stator magnetic core comprises silicon steel sheet units and soft magnetic composite material units, the number of the silicon steel sheet units is the same as that of the soft magnetic composite material units, the structures and the sizes of the same units are the same, and the same units are separated by another unit and are spliced circumferentially to form a complete cylinder; the silicon steel sheet unit is formed by laminating, bonding, fastening and connecting a plurality of silicon steel sheets, cutting and forming, wherein the inner side surface and the outer side surface of the silicon steel sheet unit are two curved surfaces, the other side surfaces are planes, and the inner side surface of the silicon steel sheet unit is provided with a notch for installing an armature winding;
The inner side surface and the outer side surface of the silicon steel sheet unit are part of the inner side surface and the outer side surface of the stator magnetic core respectively; the inner side surface and the outer side surface of the soft magnetic composite material unit are also two curved surfaces, the arc length of the inner side surface is shorter than that of the outer side surface, and the inner side surface is also provided with a notch which is matched with the notch on the silicon steel sheet unit; the two rectangular silicon steel sheets and the silicon steel sheet unit and the soft magnetic composite material unit are fastened and connected through an adhesive;
the width of the annular grooves at the two ends of the inner part of the stator magnetic core is the same and is half of the width of the annular groove at the middle part, and an armature winding is respectively arranged in the annular grooves at the two ends; two armature windings are respectively arranged in the annular channels in the middle, and the two armature windings are insulated.
2. A cylindrical permanent magnet linear motor employing a hybrid stator core according to claim 1, wherein the stator core comprises five silicon steel sheet units and five soft magnetic composite material units.
3. The cylindrical permanent magnet linear motor adopting the mixed material stator core according to claim 1, wherein the mover core is made of soft magnetic composite material by compression molding.
4. A cylindrical permanent magnet linear motor employing a hybrid stator core according to claim 1, wherein the permanent magnets are ferrite materials.
5. A cylindrical permanent magnet linear motor employing a hybrid stator core according to claim 1, wherein the armature winding is copper wire.
6. The cylindrical permanent magnet linear motor using a hybrid stator core according to claim 1, wherein the soft magnetic composite material unit is obtained by molding a soft magnetic composite material.
7. A cylindrical permanent magnet linear motor according to any of claims 3 or 6, wherein the soft magnetic composite material is 7003P.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110422642.0A CN112953156B (en) | 2021-04-16 | 2021-04-16 | Cylindrical permanent magnet linear motor adopting mixed material stator magnetic core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110422642.0A CN112953156B (en) | 2021-04-16 | 2021-04-16 | Cylindrical permanent magnet linear motor adopting mixed material stator magnetic core |
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| Publication Number | Publication Date |
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| CN112953156A CN112953156A (en) | 2021-06-11 |
| CN112953156B true CN112953156B (en) | 2024-05-07 |
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| CN202110422642.0A Active CN112953156B (en) | 2021-04-16 | 2021-04-16 | Cylindrical permanent magnet linear motor adopting mixed material stator magnetic core |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012119302A1 (en) * | 2011-03-07 | 2012-09-13 | 浙江博望科技发展有限公司 | Ferrite three-phase permanent magnet motor |
| WO2012119301A1 (en) * | 2011-03-07 | 2012-09-13 | 浙江博望科技发展有限公司 | Ferrite three-phase permanent magnet motor |
| CN106067720A (en) * | 2016-07-06 | 2016-11-02 | 江苏大学 | A kind of low-loss semi-closed port grooved fault-tolerant permanent-magnetic cylindrical linear electric motors and processing method thereof |
| CN108683313A (en) * | 2018-07-26 | 2018-10-19 | 河北工业大学 | A kind of efficient axial flux permanent magnet motor of high power density |
| CN108696094A (en) * | 2018-05-30 | 2018-10-23 | 沈阳工业大学 | A kind of not equal teeth mixed structure permanent-magnetism linear motor of soft-magnetic composite material |
| CN108832791A (en) * | 2018-07-26 | 2018-11-16 | 河北工业大学 | A kind of magnetic pawl motor of high power density high efficiency high reliability |
| CN109004777A (en) * | 2018-07-26 | 2018-12-14 | 河北工业大学 | A kind of flux-reversal claw-pole motor component |
| CN214480221U (en) * | 2021-04-16 | 2021-10-22 | 河北工业大学 | Cylindrical permanent magnet linear motor adopting mixed material stator magnetic core |
-
2021
- 2021-04-16 CN CN202110422642.0A patent/CN112953156B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012119302A1 (en) * | 2011-03-07 | 2012-09-13 | 浙江博望科技发展有限公司 | Ferrite three-phase permanent magnet motor |
| WO2012119301A1 (en) * | 2011-03-07 | 2012-09-13 | 浙江博望科技发展有限公司 | Ferrite three-phase permanent magnet motor |
| CN106067720A (en) * | 2016-07-06 | 2016-11-02 | 江苏大学 | A kind of low-loss semi-closed port grooved fault-tolerant permanent-magnetic cylindrical linear electric motors and processing method thereof |
| CN108696094A (en) * | 2018-05-30 | 2018-10-23 | 沈阳工业大学 | A kind of not equal teeth mixed structure permanent-magnetism linear motor of soft-magnetic composite material |
| CN108683313A (en) * | 2018-07-26 | 2018-10-19 | 河北工业大学 | A kind of efficient axial flux permanent magnet motor of high power density |
| CN108832791A (en) * | 2018-07-26 | 2018-11-16 | 河北工业大学 | A kind of magnetic pawl motor of high power density high efficiency high reliability |
| CN109004777A (en) * | 2018-07-26 | 2018-12-14 | 河北工业大学 | A kind of flux-reversal claw-pole motor component |
| CN214480221U (en) * | 2021-04-16 | 2021-10-22 | 河北工业大学 | Cylindrical permanent magnet linear motor adopting mixed material stator magnetic core |
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| CN112953156A (en) | 2021-06-11 |
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