CN112600318A - Ferrite product capable of reducing motor tooth space torque and forming die thereof - Google Patents
Ferrite product capable of reducing motor tooth space torque and forming die thereof Download PDFInfo
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- CN112600318A CN112600318A CN202011532279.XA CN202011532279A CN112600318A CN 112600318 A CN112600318 A CN 112600318A CN 202011532279 A CN202011532279 A CN 202011532279A CN 112600318 A CN112600318 A CN 112600318A
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- 238000010521 absorption reaction Methods 0.000 claims description 19
- 239000011159 matrix material Substances 0.000 claims description 12
- 210000003781 tooth socket Anatomy 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 229910001347 Stellite Inorganic materials 0.000 claims description 4
- AHICWQREWHDHHF-UHFFFAOYSA-N chromium;cobalt;iron;manganese;methane;molybdenum;nickel;silicon;tungsten Chemical compound C.[Si].[Cr].[Mn].[Fe].[Co].[Ni].[Mo].[W] AHICWQREWHDHHF-UHFFFAOYSA-N 0.000 claims description 4
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- 229910052788 barium Inorganic materials 0.000 description 1
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Classifications
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- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
Abstract
A ferrite product and its forming die that can reduce the cogging torque of the permanent magnet motor, the said permanent magnet ferrite product is tile-shaped, the crystal arrangement of different positions of the product carries on the n-polar shaping orientation magnetizing according to the magnetic declination beta designed; tooth grooves are arranged at the junctions of the inner arc and the outer arc of the product. The invention also comprises a forming die for manufacturing the sintered permanent magnetic ferrite product. The permanent magnetic ferrite product of the invention is assembled in the motor, and can effectively reduce the cogging torque of the motor, thereby inhibiting the noise and vibration of the motor; meanwhile, the utilization rate of permanent magnet products can be improved, the power density of the permanent magnet motor can be improved, or the material grade can be reduced under the condition of keeping the efficacy of the motor.
Description
Technical Field
The invention relates to a ferrite product, in particular to a ferrite product capable of reducing the cogging torque of a motor and a forming die thereof.
Background
The cogging torque is an inherent phenomenon of the permanent magnet motor, which can cause the motor not to run stably, generate vibration and noise, and cause the fluctuation of the rotating speed, and meanwhile, the motor can run normally only by overcoming the cogging torque under the low-speed running, so that the permanent magnet motor is difficult to start at low speed. How to reduce the cogging torque of the permanent magnet is a precondition for further application and popularization of the permanent magnet motor in household appliances such as washing machines, refrigerators, air conditioners and the like. At present, a permanent magnet tile magnetic product of a permanent magnet motor for household appliances is generally produced by two production modes of integral radiation orientation (an orientation schematic diagram is shown in an attached drawing 4) or parallel orientation (is shown in an attached drawing 5), and after the product is installed in a motor, a 2n (n is the number of designed poles of the motor/the number of sheets of the permanent magnet product assembled on the motor) pole radiation magnetizing mode is adopted to meet the requirement of the number of poles of the motor. The distribution of the air gap magnetic field generated by magnetizing the overall radiation orientation permanent magnetic ferrite product is generally saddle-shaped (see attached figure 6), and the motor has the characteristics that the permanent magnet has higher magnetic utilization rate, so that the motor has high efficiency, but the generated tooth space torque is larger, and the vibration and the noise of the motor are larger; the air gap magnetic field generated by magnetizing the whole parallel orientation permanent magnetic ferrite product is in a sine wave shape (see attached figure 7), the motor is characterized in that the cogging torque is small, but the utilization rate of the magnetic performance of the permanent magnet is low, so that the efficiency of the motor is low. Therefore, the research direction of the permanent magnet product is to reduce the cogging torque of the motor under the condition of improving the utilization rate of the magnetic performance of the permanent magnet so as to improve the motor.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art and provide a ferrite product which can reduce the cogging torque of a motor and improve the efficiency of the motor.
The present invention further aims to overcome the above-mentioned drawbacks of the prior art and provide a forming mold for manufacturing ferrite products that can reduce the cogging torque of the motor.
The technical scheme adopted by the invention for solving the technical problems is as follows: a ferrite product capable of reducing cogging torque of a motor is tile-shaped, and crystal arrangement of different parts of the product is subjected to n-pole forming orientation magnetization according to a designed magnetic declination angle beta, wherein n is the number of designed poles of the motor/the number of permanent magnet pieces assembled on the motor.
Further, the value range of n is 1-4, and the preferential axis of the material crystal of each polar orientation part in the product is arranged and oriented according to a design angle (magnetic declination).
Further, tooth grooves are formed between the inner arc and the outer arc of the product. The tooth grooves are processed in a grinding mode. The width of the bottom of the tooth socket is consistent with that of the tooth socket designed by the motor.
Furthermore, the depth of the outer arc tooth socket is 0.5 +/-0.1 mm, and the depth of the inner arc tooth socket is 1.5 +/-0.3 mm.
Furthermore, two sides of the tooth socket form an included angle of 90 degrees, and the two sides are connected in the tooth socket through a transition arc.
Preferably, the ferrite capable of reducing the cogging torque of the motor has a chemical composition of barium-based ferrite, strontium-based ferrite, or calcium-based ferrite. The most widely used permanent magnetic ferrite is strontium ferrite, and the second is barium ferrite, which belong to hexagonal crystal systems, and the easy magnetization axis is in the c axis, so that a permanent magnetic field can be generated by only providing magnetization energy from the outside once.
The invention further solves the technical problem and adopts the technical scheme that: the upper die water absorption plate comprises an upper die water absorption plate body and a punch, wherein the upper die water absorption plate body is composed of a first magnetic conduction layer base body and a first non-magnetic conduction layer embedded into the first magnetic conduction layer base body, the bottom surface of the first non-magnetic conduction layer of the upper die water absorption plate body is in contact with a die cavity, the punch is composed of a second magnetic conduction layer base body and a second non-magnetic conduction layer, an arc-shaped boss is arranged on the upper end surface of the second magnetic conduction layer base body, and the center line of each boss corresponds to the.
Preferably, the width of the boss is the green width/(2 × n); the height is designed to be 8-10 mm. Designing the radian of the boss: the connecting line of two side edges of the lug boss is an arc surface formed by an included angle of 90 degrees. The lower end face of the second non-magnetic conductive layer is consistent with the shape of the upper end face of the second magnetic conductive layer matrix.
The middle part of the upper end face of the second non-magnetic-conductive layer is an arc-shaped face or a plane, and the inner arc faces are consistent according to green body design.
Further, the width and thickness of the first non-magnetic-conductive layer of the upper water suction plate are calculated and designed according to the requirement of the magnetic declination angle of the product, and generally, the magnetic declination angle of the product is correspondingly increased along with the increase of the width and thickness of the first non-magnetic-conductive layer. The width and the thickness of the non-magnetic conductive layer material are calculated according to the declination beta of the permanent magnetic ferrite product, and specifically are as follows: width of first non-magnetic conductive layer of water absorption plate (design green thickness d)1+ punch center point non-magnetic conducting thickness d2) And/tan (beta) ± 2 mm. Thickness of the first non-magnetic conductive layer of the water absorption plate (design green body thickness d)1+ punch center point non-magnetic conducting thickness d2)*(1/tan(β)-1)±2mm。
Further, the second magnetic conduction layer matrix of the punch is made of 45 steel, and the second non-magnetic conduction layer is made of 70Mn, 60Mn, 50Mn or stellite.
Further, the first non-magnetic conductive layer of the upper water absorption plate is made of 70Mn, 60Mn, 50Mn or stellite. The non-magnetic layer mainly has the effect of changing the orientation of magnetic lines of force, so that the distribution of the magnetic field intensity on the surface of the ferrite product is changed, and meanwhile, the non-magnetic layer is more corrosion-resistant and wear-resistant than No. 45 steel, so that the service life of the lower punch can be effectively prolonged, and the quality of the ferrite product is improved.
According to the cogging torque calculation formula, Tcog ═ pi × z × La (R2)2-R12) Σ n Gn Brnz zp sin (nza) (Tcog is cogging torque; la is the axial length of the armature core; r1 is the armature outer radius; r2 is the stator inner radius; n is the harmonic frequency corresponding to the magnetic conductance; brnz/zp is the air gap magnetic field density; gn is the air gap flux density fourier expansion coefficient). The main influence of the permanent magnetic ferrite product on the cogging torque is the air gap magnetic field density distribution. Permanent magnet motor air gapThe optimal magnetic field density distribution is Halbach magnetic field distribution, and the utilization rate of the magnetic performance of the permanent magnet can be improved to the maximum extent while the cogging torque is reduced to the greatest extent. According to the design of a Halbach array, M-phase crystal preferential axes at different parts in a magnet are required to be arranged and distributed according to a certain angle (see figure 8).
The permanent magnetic ferrite production process is a typical powder metallurgy process. Firstly, grinding permanent magnetic ferrite powder particles to a range of 0.6-1.0 micron, then pressing and molding the powder in a mold into a green body through an oil press or a mechanical press, generating a magnetic field through a coil in the molding process, and forming a complete loop by magnetic lines of force of the magnetic field along guide posts of the press, an upper mold of the mold, a magnetic conduction magnetic path of a punch and the permanent magnetic ferrite powder particles of a cavity. The preferential axis of the powder particles is distributed in the cavity along the magnetic lines of force. The grain interface transforms into a crystal interface at high temperatures of about 1200 c during sintering, at which time the preferential axis of the grains transforms into the preferential axis of the crystal arrangement. Therefore, the key technology for arranging the crystals in the permanent magnetic ferrite product along the designed declination is the distribution design of magnetic force lines in the die cavity. The shape and thickness of the magnetic conduction layer and the non-magnetic conduction layer are designed on different parts of the water absorption plate on the die and the punch, and magnetic lines of force generated by the coil are distributed in the die cavity to be guided, so that the distribution difference of the magnetic lines of force in different directions is achieved, and the permanent magnetic ferrite magnetic powder is pressed in the die cavity to be preferentially oriented according to the distribution direction of the magnetic lines of force.
The principle of the invention is as follows: in the process of forming the permanent magnetic ferrite, a magnetic field is generated when a coil of a press is electrified, and magnetic lines of force of the magnetic field form a complete loop along an upper cross beam and a lower cross beam of the press, a guide post, a water absorption plate and a punch of a die and an air gap in a die cavity. According to the second law of magnetic circuit: coil winding total flux potential source 0.4 pi sigma Ni*Ii＝HCrossbeamLCross beam+HGuide postLGuide post+HWater absorption plateLWater absorption plate+HPunch headLPunch head+HAir gapLAir gap. Air gap magnetic field intensity H in cavityAir gap＝(0.4Π*∑Ni*Ii—_HCrossbeamLCross beam—HGuide postLGuide post—HWater absorption plateLWater absorption plate—HPunch headLPunch head)/LAir gap. According to calculation, under the condition that the conditions of the coil and the press are consistent, the oriented magnetic field strength H of each part in the cavity is in inverse proportion to the length of the air gap. Different air gap lengths are formed at different parts of the cavity by designing the shapes and thicknesses of the magnetic layer matrix and the non-magnetic layer of the water suction plate and the punch of the die, so that different oriented magnetic fields are formed. In addition, in the magnetic circuit, the magnetic force line always passes along the direction with the minimum magnetic resistance RmL/(μ x a) (L: air gap length, a: cross-sectional area perpendicular to the magnetic field lines, μ: permeability). Therefore, the magnetic lines of force are arranged according to the length direction of the shortest air gap at different positions between the water suction plate of the die and the punch. By designing the shapes and the thicknesses of the magnetic conduction layer and the non-magnetic conduction layer of the mould and the water absorption plate, the directions and the densities of the magnetic lines of force of different parts can be obtained. The included angle beta between the direction of the magnetic force lines at different positions and the vertical direction is called magnetic declination. During the pressing process of the permanent magnetic ferrite particles, the preferential axis of the particles is arranged along the direction of the magnetic lines of the air-gap magnetic field of the cavity, and the density of the particles is positively correlated with the density of the magnetic lines of the magnetic field. The grain interface transforms into a crystal interface at high temperatures of about 1200 c during sintering, at which time the preferential axis of the grains transforms into the preferential axis of the crystal arrangement. The crystal arrangement direction in the product is arranged according to the designed declination. Meanwhile, the tooth grooves are formed in the junction of the poles and the poles of the single-piece product, the magnetic field at the tooth grooves is further reduced, and the distribution of the surface magnetic field of the product after the product is filled into the motor and is magnetized is ensured to be in accordance with the distribution of the Halbach magnetic field, so that the tooth groove torque of the product is reduced, and the utilization rate of the magnet is greatly improved.
The invention has the beneficial effects that: the permanent magnetic ferrite product is assembled in the motor, so that the tooth space torque of the motor in operation can be effectively reduced, the operation noise and vibration of the motor are reduced, and the performance utilization rate of the permanent magnet can be greatly improved.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a permanent magnetic ferrite product of the present invention;
FIG. 2 is a schematic view of the orientation of magnetic lines of force after the permanent magnetic ferrite product of the embodiment of the present invention is subjected to orientation magnetization;
FIG. 3 is a schematic structural diagram of an embodiment of a forming mold for manufacturing permanent magnetic ferrite products according to the present invention;
FIG. 4 is a schematic view of the orientation of magnetic lines of force after the conventional integral radiation orientation permanent magnetic ferrite product is subjected to orientation magnetization;
FIG. 5 is a schematic view of the orientation of magnetic lines of force after the conventional integral parallel orientation permanent magnetic ferrite product is subjected to orientation magnetization;
FIG. 6 is a diagram of the distribution (saddle shape) of the magnetic field at the air gap of the motor after the conventional integral radiation orientation permanent magnetic ferrite product is magnetized;
FIG. 7 is a diagram of the distribution (sine waveform) of the magnetic field at the air gap of the motor after the conventional integral parallel orientation permanent magnetic ferrite product is magnetized;
FIG. 8 is a schematic structural diagram of a permanent magnet product magnetic declination angle beta designed by a Halbach array;
FIG. 9 is a schematic diagram of SEM scanning analysis results of the internal structure of an embodiment of a permanent magnetic ferrite product of the present invention;
FIG. 10 is a schematic diagram of the magnetic declination of the internal crystal of a conventional radiation orientation permanent magnetic ferrite product of a comparative example;
FIG. 11 is a distribution diagram of an air gap magnetic field after a permanent magnetic ferrite product is loaded into a motor and magnetized according to an embodiment of the present invention;
FIG. 12 is a distribution diagram of the air gap field of a motor of a comparative example conventional radiation oriented permanent magnetic ferrite product;
FIG. 13 is a schematic diagram showing the comparison of a cogging torque test after a permanent magnetic ferrite product installation machine according to an embodiment of the present invention and a conventional radiation-oriented product installation machine of a comparative example;
FIG. 14 is a magnetic field simulation distribution plot for analyzing the magnetic field of the mold cavity of the present invention during the molding process of the mold using finite element based simulation;
FIG. 15 is a simulation diagram of magnetic field simulation during the molding process of a conventional radiation-oriented permanent magnetic ferrite product molding die;
fig. 16 is a structural schematic view of a conventional radiation-oriented magnetizing mold.
In the figure, 1, a permanent magnetic ferrite magnetic shoe product, 2, a tooth groove, 3, an upper die water absorption plate, 4, a punch, 301, a first magnetic conduction layer matrix, 302, a first non-magnetic conduction layer, 401, a second magnetic conduction layer matrix, 402 and a second non-magnetic conduction layer.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Referring to fig. 1-2, the embodiment of the invention is a strontium ferrite product, specifically a 2-pole molded oriented magnetized permanent magnetic ferrite tile magnetic product 1, and the magnetic declination beta is designed to be 30 ± 5 degrees and is used for a permanent magnet motor for a washing machine. The permanent magnet motor is designed with 48 poles, 24 pieces of products are assembled, and each piece of product is magnetized in a mode that 2 poles correspond to the motor.
The tooth space 2 is designed at the junction of the product pole and the pole, and after the product is sintered, the product is processed by adopting a diamond grinding wheel when the product is subjected to inner and outer arc grinding.
Fig. 9 is a schematic diagram of SEM scanning analysis results of the internal structure of the permanent magnetic ferrite product, showing that the crystal declination angle inside the product is 35 °. Compared with the prior conventional radiation oriented product, the comparative example is shown in figure 10, and the magnetic declination of the crystal arrangement in the comparative example is only about 15 degrees. Compared with the comparative example, the declination of the product of the embodiment is improved.
Referring to fig. 11, which is a distribution diagram of the air-gap field after the product of the present invention is installed in the motor and is magnetized, compared with the air-gap field after the conventional radiation oriented product is installed in the motor as shown in fig. 12, the air-gap field at the pole-pole junction is significantly weakened, and the apparent magnetic peak value is improved.
Referring to fig. 13, a comparison of cogging torque testing after the product assembly of the present invention is assembled with a conventional prior art radiation-oriented product assembly.
Fig. 16 is a schematic structural diagram of a conventional radiation-oriented magnetizing die, in which the middle of the upper end surface of the lower punch base in the comparative example is an arc surface, and the lower end surface of the non-magnetic conductive layer is in the same shape as the upper end surface of the lower punch base. The whole water absorption plate is made of No. 45 steel which is a magnetic conductive material.
Referring to fig. 3, the present embodiment is an embodiment of a forming die for manufacturing a permanent magnetic ferrite product that can reduce cogging torque of a motor, and includes an upper die suction plate 3 and a punch 4, as compared with the comparative example shown in fig. 16. The upper mold water absorption plate 3 of the permanent magnetic ferrite molding mold comprises a first magnetic conduction layer matrix 301 and a first non-magnetic conduction layer 302, and the non-magnetic conduction layer material is embedded in the magnetic conduction layer matrix material. The first magnetic conduction layer substrate 301 is made of No. 45 steel, and the first non-magnetic conduction layer 302 is made of 70Mn material.
The punch 4 is composed of a second magnetically permeable layer base 401 and a second non-magnetically permeable layer 402. The upper end surface of the second magnetic conduction layer base 401 adopts a boss structure, the bosses are circular arc surfaces, and the center line of each boss corresponds to the center line of the designed pole number of the product. The second non-magnetic conductive layer 402 is formed on the second magnetic conductive layer substrate 401 by stellite overlaying.
Referring to fig. 14-15, a magnetic field simulation distribution diagram for analyzing the magnetic field of the mold cavity in the molding process of the mold according to the present invention based on finite element simulation is adopted, the magnetic declination angle of the permanent magnetic ferrite product in this embodiment is about 30 °, and compared with the comparative example shown in fig. 15, the magnetic declination angle of the product is about 15 ° as shown by the magnetic field simulation result in the mold cavity in the molding process of the conventional radiation orientation.
Various modifications and variations of the present invention may be made by those skilled in the art, and they are also within the scope of the present invention provided they are within the scope of the claims of the present invention and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (9)
1. The utility model provides a can reduce ferrite product of motor tooth's socket moment of torsion, is tile-shaped, its characterized in that: and (3) carrying out n-pole forming orientation magnetizing on crystal arrangement of different parts of the product according to a designed magnetic declination beta, wherein n is the number of designed poles of the motor/the number of permanent magnet sheets assembled on the motor.
2. The ferrite product capable of reducing motor cogging torque as claimed in claim 1, wherein: the value range of n is 1-4.
3. The ferrite product capable of reducing motor cogging torque according to claim 1 or 2, wherein: the inner arc and the outer arc of the product are provided with tooth grooves among poles, and the width of the bottom of each tooth groove is consistent with that of the tooth groove designed by the motor.
4. The ferrite product capable of reducing motor cogging torque as claimed in claim 3, wherein: the depth of the outer arc tooth socket is 0.5 +/-0.1 mm, and the depth of the inner arc tooth socket is 1.5 +/-0.3 mm.
5. The ferrite product capable of reducing motor cogging torque as claimed in claim 4, wherein: two sides of the tooth socket form an included angle of 90 degrees, and the two sides are connected in the tooth socket through a transition arc.
6. A forming die for manufacturing a ferrite product capable of reducing motor cogging torque according to any one of claims 1 to 5, comprising an upper die suction plate and a punch, wherein: the upper die water absorption plate is composed of a first magnetic conduction layer matrix and a first non-magnetic conduction layer embedded in the first magnetic conduction layer matrix, the bottom surface of the first non-magnetic conduction layer of the upper die water absorption plate is in contact with a die cavity, the punch is composed of a second magnetic conduction layer matrix and a second non-magnetic conduction layer, arc-shaped bosses are arranged on the upper end surface of the second magnetic conduction layer matrix, and the center line of each boss corresponds to the center line of the designed number of poles of the product.
7. The forming die for manufacturing a ferrite product capable of reducing motor cogging torque as claimed in claim 6, wherein: the width and the thickness of the first non-magnetic-conductive layer are calculated through a product magnetic declination.
8. The forming die for manufacturing a ferrite product capable of reducing motor cogging torque as claimed in claim 6, wherein: the middle part of the upper end surface of the second non-magnetic conductive layer is an arc surface or a plane.
9. The molding die for manufacturing a ferrite product for reducing cogging torque of a motor according to claim 6, wherein: the second magnetic conduction layer matrix is made of 45 steel, and the second non-magnetic conduction layer is made of 70Mn, 60Mn, 50Mn or stellite.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011532279.XA CN112600318A (en) | 2020-12-22 | 2020-12-22 | Ferrite product capable of reducing motor tooth space torque and forming die thereof |
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| CN202011532279.XA CN112600318A (en) | 2020-12-22 | 2020-12-22 | Ferrite product capable of reducing motor tooth space torque and forming die thereof |
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| CN112600318A true CN112600318A (en) | 2021-04-02 |
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| CN1674171A (en) * | 2004-03-25 | 2005-09-28 | Tdk株式会社 | Method for producing magnet, method for forming magnetic powder and dry type forming devie |
| CN200960550Y (en) * | 2006-10-16 | 2007-10-17 | 安徽龙磁科技有限责任公司 | Permanent-magnet ferrite hetero-direction wet pressing magnetic tile forming die lower punch |
| CN201285702Y (en) * | 2008-10-27 | 2009-08-05 | 鞍山市德康磁性材料有限责任公司 | Tile shaped magnetic steel die for producing permanent ferrite with auxiliary magnetic field orientation |
| CN101741186A (en) * | 2009-12-28 | 2010-06-16 | 金坛市磁性材料有限公司 | Moulding stamper for magnetic shoe of permanent magnet DC motor stator and using method thereof |
| CN201566025U (en) * | 2009-12-11 | 2010-09-01 | 安徽金寨将军磁业有限公司 | Permanent magnetic ferrite magnetic shoe counter-pressure mould |
| CN201845657U (en) * | 2010-11-04 | 2011-05-25 | 广东省梅州市磁性材料厂 | Anti-backwater forming die for wet-pressing permanent ferrite magnetic tile |
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| CN202861398U (en) * | 2012-11-01 | 2013-04-10 | 横店集团东磁股份有限公司 | Magnet mold structure enabling surface magnetic field in center to be stronger than surface magnetic fields on two sides |
| CN203599522U (en) * | 2013-12-05 | 2014-05-21 | 横店集团东磁股份有限公司 | Automatic injection forming die special for microwave oven annular magnetic steel |
| CN105946098A (en) * | 2016-03-10 | 2016-09-21 | 安徽金寨将军磁业有限公司 | Multi-pole magnetizing permanent magnetic ferrite magnetic tile die |
| CN107415032A (en) * | 2017-09-18 | 2017-12-01 | 安徽龙磁科技股份有限公司 | A kind of magnetic shoe molding press device for studding with non-magnet_conductible material |
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| CN107617740A (en) * | 2016-07-15 | 2018-01-23 | 日立金属株式会社 | Sintered body, its manufacture method, decompressor and resin molded ring |
| CN111745786A (en) * | 2020-07-20 | 2020-10-09 | 盐城市中天磁材有限公司 | Novel mould structure is used in production of magnetic shoe |
| CN111933379A (en) * | 2020-06-22 | 2020-11-13 | 浙江凯文磁业有限公司 | Magnetic field device and process for preparing radial radiation rare earth permanent magnetic tile |
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| CN201285702Y (en) * | 2008-10-27 | 2009-08-05 | 鞍山市德康磁性材料有限责任公司 | Tile shaped magnetic steel die for producing permanent ferrite with auxiliary magnetic field orientation |
| CN201566025U (en) * | 2009-12-11 | 2010-09-01 | 安徽金寨将军磁业有限公司 | Permanent magnetic ferrite magnetic shoe counter-pressure mould |
| CN101741186A (en) * | 2009-12-28 | 2010-06-16 | 金坛市磁性材料有限公司 | Moulding stamper for magnetic shoe of permanent magnet DC motor stator and using method thereof |
| CN201845657U (en) * | 2010-11-04 | 2011-05-25 | 广东省梅州市磁性材料厂 | Anti-backwater forming die for wet-pressing permanent ferrite magnetic tile |
| CN202438610U (en) * | 2012-02-16 | 2012-09-19 | 自贡市江阳磁材有限责任公司 | Molding die for magnetic tiles with evenly distributed high magnetic flux densities on inner arc surfaces |
| CN202861398U (en) * | 2012-11-01 | 2013-04-10 | 横店集团东磁股份有限公司 | Magnet mold structure enabling surface magnetic field in center to be stronger than surface magnetic fields on two sides |
| CN203599522U (en) * | 2013-12-05 | 2014-05-21 | 横店集团东磁股份有限公司 | Automatic injection forming die special for microwave oven annular magnetic steel |
| CN105946098A (en) * | 2016-03-10 | 2016-09-21 | 安徽金寨将军磁业有限公司 | Multi-pole magnetizing permanent magnetic ferrite magnetic tile die |
| CN107617740A (en) * | 2016-07-15 | 2018-01-23 | 日立金属株式会社 | Sintered body, its manufacture method, decompressor and resin molded ring |
| CN107579628A (en) * | 2017-08-30 | 2018-01-12 | 浙江凯文磁钢有限公司 | A kind of method for manufacturing radial radiation orientation rare-earth permanent magnet ferrite arch magnet |
| CN107415032A (en) * | 2017-09-18 | 2017-12-01 | 安徽龙磁科技股份有限公司 | A kind of magnetic shoe molding press device for studding with non-magnet_conductible material |
| CN111933379A (en) * | 2020-06-22 | 2020-11-13 | 浙江凯文磁业有限公司 | Magnetic field device and process for preparing radial radiation rare earth permanent magnetic tile |
| CN111745786A (en) * | 2020-07-20 | 2020-10-09 | 盐城市中天磁材有限公司 | Novel mould structure is used in production of magnetic shoe |
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