CN115733266A - Magnetic suspension permanent magnet sheet motor suitable for centrifugal pump system - Google Patents
Magnetic suspension permanent magnet sheet motor suitable for centrifugal pump system Download PDFInfo
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- CN115733266A CN115733266A CN202210992309.8A CN202210992309A CN115733266A CN 115733266 A CN115733266 A CN 115733266A CN 202210992309 A CN202210992309 A CN 202210992309A CN 115733266 A CN115733266 A CN 115733266A
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- 239000000725 suspension Substances 0.000 title claims abstract description 18
- 229910001172 neodymium magnet Inorganic materials 0.000 claims abstract description 107
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims abstract description 87
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 13
- 238000005339 levitation Methods 0.000 claims description 10
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000002657 fibrous material Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
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- 230000009471 action Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 230000033228 biological regulation Effects 0.000 description 1
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- 239000008358 core component Substances 0.000 description 1
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- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention discloses a magnetic suspension permanent magnet slice motor suitable for a centrifugal pump system, wherein four groups of permanent magnet groups with the same structure are uniformly embedded in an inner rotor iron core along the circumferential direction, each group of permanent magnet groups is formed by sequentially connecting a first neodymium iron boron permanent magnet, a built-in arc permanent magnet and a second neodymium iron boron permanent magnet into a V shape, four surface-mounted arc neodymium iron boron permanent magnets are uniformly attached to the outer surface of the rotor iron core along the circumferential direction, the magnetizing directions of the first neodymium iron boron permanent magnet and the second neodymium iron boron permanent magnet are both along the directions from the inner end to the outer end, the magnetizing directions of all the built-in arc permanent magnets are all magnetized from inside to outside along the central line direction, and the magnetizing direction of each surface-mounted arc neodymium iron boron permanent magnet is the same as that of the built-in arc permanent magnet which is opposite to the surface-mounted arc neodymium iron boron permanent magnet; the invention is combined with the centrifugal pump, thereby not only reducing the loss of the rotor core and the eddy current, but also effectively reducing the torque pulsation and ensuring the suspension stable operation of the centrifugal pump.
Description
Technical Field
The invention belongs to the technical field of motor design, and particularly relates to a magnetic suspension permanent magnet sheet motor with a built-in and surface-mounted mixed rotor structure, which is applied to a centrifugal pump system.
Background
The centrifugal pump is widely applied to various fields such as agricultural field irrigation, petrochemical industry, power industry, urban drainage and the like as a general machine, in a centrifugal pump system, a motor is often used as a core component of energy transmission, and the performance of the motor directly influences the energy conversion efficiency and the reliability of the centrifugal pump system. The drive of traditional centrifugal pump is connected the impeller shaft of pump with electric shaft through the shaft coupling, makes impeller and motor rotate together and work, because there is the sealing washer between the impeller of motor shaft and centrifugal pump, leads to the centrifugal pump to take place to reveal, inevitably has reduced centrifugal pump system's efficiency.
The bearing-free permanent magnet thin-sheet motor (BPMSM) can effectively solve the leakage problem of the centrifugal pump, integrates an impeller of the centrifugal pump and a rotor of the motor into a whole, is sealed in a pump cavity together, and provides a rotating magnetic field and drives the impeller to rotate by a stator winding of the motor. The bearingless permanent magnet sheet motor utilizes the similarity of a motor stator structure and an electromagnetic bearing structure, a bearing winding generating radial suspension force is embedded into a motor stator tooth, the difference between the pole pair number of a torque winding and the pole pair number of a suspension winding is +/-1, and the active suspension of a rotor in two radial degrees of freedom is realized through an uneven air gap generated after two sets of windings are conducted; in addition, the excitation rotor is designed into a disc shape, the passive suspension of the rotor in three degrees of freedom in the axial direction of the motor is guaranteed by using the action of magnetic resistance, and the bearingless permanent magnet slice motor simplifies the structure of the traditional motor and greatly reduces the cost of the motor by using a suspension mode of combining driving and driven.
Because the permanent magnet with single structure such as neodymium iron boron is adopted as excitation, the permanent magnet motor has a constant air gap magnetic field, but the speed regulation range of the motor is narrow. For example, in the motor disclosed in the chinese patent publication No. CN202021211305.4, a permanent magnet auxiliary reluctance motor is formed by embedding a permanent magnet and a non-magnetic conductor in an arc-shaped slot, and such a motor can effectively improve torque density by using permanent magnet torque and rotational reluctance torque, but when the permanent magnet is embedded in a magnetic isolation bridge, only a relatively low air gap magnetic flux density can be generated, and the magnetic flux density contains a large harmonic, which results in large torque ripple and core loss, further limiting the improvement of motor efficiency. Aiming at large torque ripple, the motor is improved by optimizing the structure of the motor body, for example, in the motor disclosed in the document with the Chinese patent publication number of 201711308185.2, the reasonable optimization of the magnetic circuit of the stator of the motor is realized by placing permanent magnets with different polarization directions, and the torque ripple of the motor is effectively reduced.
The centrifugal pump system with high energy conversion efficiency needs a motor with high torque density and low torque ripple, so that the problem of how to effectively reduce the torque ripple output by the motor and reduce the air gap harmonic content and improve the high-temperature demagnetization of the permanent magnet under the condition of maintaining the high torque density of the motor becomes a problem to be solved urgently in the field of design of the bearingless permanent magnet sheet motor.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the magnetic suspension permanent magnet sheet motor which can reasonably adjust the air gap magnetic field of the motor, improve the torque density, reduce the air gap harmonic wave and the torque pulsation and is suitable for a centrifugal pump system.
The invention relates to a magnetic suspension permanent magnet sheet motor suitable for a centrifugal pump system, which adopts the technical scheme that:
the permanent magnet motor comprises an outer stator and an inner rotor, wherein the inner rotor comprises a rotor iron core, four groups of permanent magnet groups with the same structure are uniformly embedded in the rotor iron core along the circumferential direction, each group of permanent magnet groups is provided with n layers of permanent magnets along the diameter direction, and n is more than or equal to 5; each layer of permanent magnet is formed by sequentially connecting a first neodymium iron boron permanent magnet, a built-in arc permanent magnet and a second neodymium iron boron permanent magnet into a V shape, and the V-shaped opening of each layer of permanent magnet and the arc opening of the built-in arc permanent magnet face the outside; the center lines of the n built-in arc permanent magnets 3 are collinear along the same diameter direction, the first neodymium iron boron permanent magnet and the second neodymium iron boron permanent magnet are symmetrically arranged relative to the center line of the connected built-in arc permanent magnet, the inner ends of the first neodymium iron boron permanent magnet and the second neodymium iron boron permanent magnet in each layer of permanent magnet are fixedly connected with the corresponding built-in arc permanent magnet in a seamless mode, and the outer ends of the first neodymium iron boron permanent magnet and the second neodymium iron boron permanent magnet are flush with the outer surface of the rotor iron core; four surface-mounted arc-shaped neodymium iron boron permanent magnets are uniformly and externally attached to the outer surface of the rotor iron core along the circumferential direction, each surface-mounted arc-shaped permanent magnet faces a built-in arc-shaped permanent magnet, and the central lines of the four surface-mounted arc-shaped neodymium iron boron permanent magnets are collinear; the magnetizing directions of the first neodymium iron boron permanent magnet and the second neodymium iron boron permanent magnet are all in the direction from the inner end to the outer end of the first neodymium iron boron permanent magnet, the magnetizing directions of all the built-in arc permanent magnets are all in the direction from inside to outside along the center line of the built-in arc permanent magnets, and the magnetizing direction of each surface-mounted arc neodymium iron boron permanent magnet is the same as that of the built-in arc permanent magnet opposite to the surface-mounted arc neodymium iron boron permanent magnet; the rotor core and the centrifugal pump impeller are integrated into a whole.
The surface-mounted arc permanent magnet and the built-in arc permanent magnet are made of NdFe30 NdFeB materials, and the first NdFeB permanent magnet and the second NdFeB permanent magnet are made of NdFe35 NdFeB materials.
The outer surfaces of the four surface-mounted circular arc neodymium iron boron permanent magnets are sleeved with a rotor protective sleeve together, the rotor protective sleeve is of a cylindrical structure made of mesh-shaped fiber materials, and the rotor protective sleeve is in a thread shape.
The n layers of permanent magnets are arranged at intervals along the radial direction, and the distance between every two adjacent layers of permanent magnets is equal.
n first neodymium iron boron permanent magnets in n layers of permanent magnets are parallel to each other, and n second neodymium iron boron permanent magnets in n layers of permanent magnets are parallel to each other.
The radian occupied by each built-in arc permanent magnet is 120 degrees, and the included angle between the first neodymium iron boron permanent magnet and the second neodymium iron boron permanent magnet in each layer of permanent magnet is 60 degrees.
The invention adopts the technical scheme to highlight the beneficial effects that:
1. the invention is combined with the centrifugal pump, thereby not only reducing the loss of the rotor core and the eddy current, but also effectively reducing the torque pulsation and ensuring the suspension stable operation of the centrifugal pump.
2. The invention adopts permanent magnet materials with different types, so that the magnetic performance of the outer surface of the rotor is smaller, the magnetic performance of the inner part of the rotor is larger, the weak magnetic range of the motor is effectively enlarged, and the effects of increasing the salient pole rate of the motor and reducing the torque pulsation are achieved.
3. The magnetizing directions of the surface-mounted permanent magnet and the built-in arc permanent magnet are set to be the same, the magnetic density which is approximately distributed in a sine mode is generated in an air gap, harmonic components of opposite electric potentials are smaller, and the torque can be output stably.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic view of a radial structure of a magnetic levitation permanent magnet sheet motor suitable for a centrifugal pump system according to the present invention;
FIG. 2 is an enlarged view of the structure and geometric dimensioning of one of the permanent magnet groups of FIG. 1;
FIG. 3 is a schematic view of the magnetic circuit of the present invention in operation;
FIG. 4 is a schematic diagram of the air gap flux density 3 harmonic component comparison of the structure of the present invention with a conventional surface mount, conventional internal motor;
FIG. 5 is a schematic diagram showing the comparison of 3 harmonic components of the air gap flux density in the hybrid magnetization mode and the parallel/radial magnetization mode according to the present invention;
FIG. 6 is a graph comparing the core loss of a motor using a hybrid magnetizing method with a single parallel/radial magnetizing according to the present invention;
FIG. 7 is a graph comparing eddy current losses for a hybrid magnetization mode and a single parallel/radial magnetization motor employed in the present invention;
FIG. 8 is a graph comparing core loss and eddy current loss for motors using different permanent magnet materials (NdFe 30+ NdFe 35) and the same permanent magnet material (NdFe 35+ NdFe 35) according to the present invention;
in the figure: 1-a stator core; 2, pasting a circular arc permanent magnet on the surface; 3-built-in arc permanent magnet; 4-rotor protection sleeve; 5-a stator coil; 6-rotor core; 7-a first neodymium iron boron permanent magnet, 8-a second neodymium iron boron permanent magnet, and 9-a permanent magnet filler is pasted on the surface.
Detailed Description
Referring to fig. 1, the magnetic suspension permanent magnet sheet motor suitable for a centrifugal pump system according to the present invention is a permanent magnet motor with a built-in-surface-mounted hybrid rotor structure, and includes an outer stator and an inner rotor, where the outer stator is composed of a stator core 1 and coils 5, the stator core 1 is provided with stator teeth and stator slots, and the stator teeth are wound with stator coils 5. The inner rotor includes rotor core 6, and rotor core 6 places in stator core 1's inside with the axle center, and rotor core 6's outside parcel one deck rotor protection cover 4 radially, leaves the radial air gap of 2mm between stator core 1's inner wall and the rotor protection cover 4 outer wall. The stator core 1 and the rotor core 6 are formed by laminating DW465-50 silicon steel sheets with the thickness of 0.35mm, and the laminating coefficient is 0.95.
The middle of the rotor core 6 is provided with no rotating shaft, the centrifugal pump impeller and the rotor core 6 are integrated into a whole and then sealed in the centrifugal pump together, and the rotor core 6 rotates to drive the centrifugal pump impeller to rotate.
Referring to fig. 2, four permanent magnet groups are uniformly embedded in the rotor core 6 along the circumferential direction, and the structures of the four permanent magnet groups are completely the same. Each permanent magnet group is distributed with n layers of permanent magnets along the diameter direction, n is more than or equal to 5, and only 5 layers are shown in the figure. The structure can form a multilayer magnetic circuit structure in the air gap, and meets the electromagnetic performance requirement of a high-power motor.
Each layer of permanent magnet is sequentially connected into a V-shaped structure by a first neodymium iron boron permanent magnet 7, a built-in arc permanent magnet 3 and a second neodymium iron boron permanent magnet 8. The radial cross section of the first neodymium iron boron permanent magnet 7 and the radial cross section of the second neodymium iron boron permanent magnet 8 are square, and the radial cross section of the built-in arc permanent magnet 3 is arc. The n layers of permanent magnets are arranged at intervals along the radial direction, and the adjacent two layers of permanent magnets are not in contact and have equal intervals. The V-shaped opening of the V-shaped structure of each layer of permanent magnet faces towards the outer side, namely towards the air gap side. The arc openings of the built-in arc permanent magnets 3 are also all towards the air gap side. The five arc permanent magnets 3 in the n layers of permanent magnets have the same structure, and the center lines of the n built-in arc permanent magnets 3 are collinear and along the same diameter direction. The built-in arc-shaped permanent magnet 3 in each layer of permanent magnet is arranged at the bottom of the V shape, and the first neodymium iron boron permanent magnet 7 and the second neodymium iron boron permanent magnet 8 are symmetrically arranged relative to the center line of the connected built-in arc-shaped permanent magnet 3 to form two V-shaped side edges. Therefore, the first ndfeb permanent magnet 7 and the second ndfeb permanent magnet 8 in the same layer of permanent magnet have the same structure. The inner ends of the first neodymium iron boron permanent magnet 7 and the second neodymium iron boron permanent magnet 8 in each layer of permanent magnet are fixedly connected with the corresponding built-in arc permanent magnet 3 in a seamless mode, and the outer ends of the first neodymium iron boron permanent magnet and the second neodymium iron boron permanent magnet are flush with the outer surface of the rotor core 6. n first neodymium iron boron permanent magnets 7 in n layers of permanent magnets are parallel to each other, and n second neodymium iron boron permanent magnets 8 in n layers of permanent magnets are parallel to each other.
All the magnetizing directions of the first neodymium iron boron permanent magnet 7 and the second neodymium iron boron permanent magnet 8 are the directions from the inner end to the outer end of the first neodymium iron boron permanent magnet, and are the length directions of the first neodymium iron boron permanent magnet and the second neodymium iron boron permanent magnet in the rotor iron core 6. All the built-in arc permanent magnets 3 are magnetized from inside to outside along the direction of the central line of the built-in arc permanent magnets, and are also magnetized from inside to outside through the radius direction of the rotor iron core 6 with the built-in arc permanent magnets 3.
The arc α =120 ° occupied by each built-in circular arc permanent magnet 3. The included angle between the first neodymium iron boron permanent magnet 7 and the second neodymium iron boron permanent magnet 8 in each layer of permanent magnet is 60 degrees, and the included angle beta =30 degrees between the center lines of the first neodymium iron boron permanent magnet 7, the second neodymium iron boron permanent magnet 8 and the circular arc permanent magnet 3.
The distance h =2mm between two adjacent layers of permanent magnets, namely the same distance is arranged between two adjacent first neodymium iron boron permanent magnets 7, between two adjacent second neodymium iron boron permanent magnets 8 and between two adjacent built-in arc permanent magnets 3 in the two adjacent layers of permanent magnets, and the distance h =2mm.
The width of all the first neodymium iron boron permanent magnet 7 and the second neodymium iron boron permanent magnet 8 are uniformAre all the same as delta 2 ＝2mm。
Referring to fig. 2, on the outer surface of the rotor core 6, a total of 4 surface-mounted circular arc-shaped neodymium iron boron permanent magnets 2 with two pairs of poles are uniformly surface-mounted in the circumferential direction, and the radian occupied by each surface-mounted circular arc-shaped neodymium iron boron permanent magnet 2 is 120 °. The radial thickness of each circular arc neodymium iron boron permanent magnet 2 is delta 1 =4mm, opening towards the inside. The central line of one surface-mounted circular arc neodymium iron boron permanent magnet 2 is collinear with the central line of one built-in circular arc permanent magnet 3, and one surface-mounted circular arc neodymium iron boron permanent magnet 2 faces one built-in circular arc permanent magnet 3.
The magnetizing direction of each surface-mounted circular arc neodymium iron boron permanent magnet 2 is the same as that of the built-in circular arc permanent magnet 3 which is opposite to the surface-mounted circular arc neodymium iron boron permanent magnet. Because the surface-mounted arc neodymium iron boron permanent magnet 2 and the built-in arc permanent magnet 3 are both arc structures, the parallel magnetizing mode with the same direction is adopted, the flux density which is close to sinusoidal distribution is more easily generated in an air gap, the harmonic component of opposite potential is smaller, and the stable output of torque is facilitated.
The pole arc coefficients of each surface-mounted circular arc neodymium iron boron permanent magnet 2 are the same and are 0.7, and resin filling media are adopted between every two adjacent surface-mounted circular arc permanent magnets 2, namely, surface-mounted permanent magnet fillers 9 are filled and fixed, so that the permanent magnets are prevented from being thrown out under the action of centrifugal force.
All the neodymium iron boron permanent magnets of the invention adopt permanent magnet materials with different types and have different magnetic properties. The surface-mounted arc-shaped permanent magnet 2 and the built-in arc-shaped permanent magnet 3 are made of NdFe30 NdFeB materials, and the first NdFeB permanent magnet 7 and the second NdFeB permanent magnet 8 are made of NdFe35 NdFeB materials. The magnetic performance of the outer surface of the rotor is smaller, the magnetic performance of the permanent magnet at the V-shaped structure in the rotor is larger, the weak magnetic range of the motor can be effectively enlarged by the arrangement mode, and the effects of increasing the salient pole rate of the motor and reducing torque pulsation are achieved.
Referring to fig. 1, a rotor protection sleeve 4 is attached to the outer side surface of the surface-mounted arc permanent magnet 2, the rotor protection sleeve 4 is a cylindrical structure with the thickness of 1mm and made of a mesh-shaped fiber material, and the rotor protection sleeve 4 is in a thread shape. The double design of the mesh-shaped material and the thread-shaped structure can increase the contact area between the surface-mounted arc-shaped permanent magnet 2 and air, and effectively improve the demagnetization problem of the permanent magnet caused by overheating.
Referring to fig. 3, two adjacent groups of permanent magnets are taken as an example to illustrate the working magnetic circuit of the present invention, the permanent magnet group where the N pole is located is the first group, the permanent magnet group where the S pole is located is the second group, and two magnetic circuits are arranged on the rotor core 6. As shown by the solid line in the figure, the path of the first magnetic circuit is, in order: starting from the N pole of the built-in arc permanent magnet 3 in the first group of permanent magnet groups, a circulating path is formed by the N pole of the second NdFeB permanent magnet 8 in the first group of permanent magnet groups, the surface-mounted arc NdFeB permanent magnet 2, an air gap, the stator core 1, the surface-mounted arc NdFeB permanent magnet 2, the S pole of the second NdFeB permanent magnet 8 in the second group of permanent magnet groups, the built-in arc permanent magnet 3 in the second group of permanent magnet groups, the rotor core 6 and the N pole of the built-in arc permanent magnet 3 in the first group of permanent magnet groups. As shown by the dashed line in the figure, the path of the second magnetic circuit is, in order: starting from the N pole of the built-in arc permanent magnet 3 in the first group of permanent magnet groups, a circulation path is formed by the N pole of the first NdFeB permanent magnet 7 in the first group of permanent magnet groups, the surface-mounted arc NdFeB permanent magnet 2, an air gap, the stator core 1, the surface-mounted arc NdFeB permanent magnet 2, the S pole of the first NdFeB permanent magnet 7 in the second group of permanent magnet groups, the built-in arc permanent magnet 3 in the second group of permanent magnet groups, the rotor core 6 and finally the N pole of the built-in arc permanent magnet 3 in the first group of permanent magnet groups.
After the motor is electrified, two magnetic circuits on the rotor core 6 interact with a magnetic field generated by a stator coil 5 of the motor at the same time to generate electromagnetic torque so as to drag a load to operate. Because the invention adopts the mode of combining surface mounting with built-in permanent magnet, the motor can effectively improve the torque density by utilizing the permanent magnet torque and the rotating reluctance torque. Therefore, after the centrifugal pump is combined with the centrifugal pump, if the torque pulsation output by the motor is too large, the suspension effect is invalid, and the system is stopped, so that the centrifugal pump can be operated in a suspension mode, the loss of an iron core and a vortex of a rotor can be reduced, the torque pulsation can be effectively reduced, and the stable operation of the centrifugal pump in a suspension mode is guaranteed.
Fig. 4 is a schematic diagram comparing the air gap flux density 3 harmonic component of the present invention with that of a conventional surface-mounted, conventional built-in motor, and it can be seen from fig. 4 that the present invention can reduce the harmonic component.
Fig. 5 is a schematic diagram showing the comparison of the air gap flux density 3-order harmonic component between the hybrid magnetization mode and the single parallel magnetization or radial magnetization mode, and it can be seen from fig. 5 that the air gap harmonic content can be reduced by the present invention.
Fig. 6 is a comparison graph of the core loss of the motor adopting the hybrid magnetizing method and the single parallel magnetizing or radial magnetizing, and it can be seen from fig. 6 that the core loss can be reduced by the present invention.
Fig. 7 is a comparison of eddy current loss of a motor adopting a hybrid magnetizing method and a single parallel magnetizing or radial magnetizing method, and it can be seen from fig. 7 that the eddy current loss can be reduced by the present invention.
Fig. 8 is a graph comparing the core loss and the eddy current loss of the motor when different permanent magnet materials (NdFe 30+ NdFe 35) are used according to the present invention and the same permanent magnet material (NdFe 35+ NdFe 35) is used, and it can be seen from fig. 8 that the present invention can reduce the core loss and the eddy current loss.
The foregoing is directed to embodiments of the present invention, and it is understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a magnetic suspension permanent magnetism thin slice motor suitable for centrifugal pump system, includes outer stator and inner rotor, characterized by: the inner rotor comprises a rotor core (6), four groups of permanent magnet groups with the same structure are uniformly embedded in the rotor core (6) along the circumferential direction, n layers of permanent magnets are distributed in each group of permanent magnet groups along the diameter direction, and n is more than or equal to 5; each layer of permanent magnet is formed by sequentially connecting a first neodymium iron boron permanent magnet (7), a built-in arc permanent magnet (3) and a second neodymium iron boron permanent magnet (8) into a V shape, and the V-shaped opening of each layer of permanent magnet and the arc opening of the built-in arc permanent magnet (3) face to the outside; the center lines of the n built-in arc permanent magnets (3) are collinear along the same diameter direction, the first neodymium iron boron permanent magnet (7) and the second neodymium iron boron permanent magnet (8) are symmetrically arranged relative to the center line of the connected built-in arc permanent magnet (3), the inner ends of the first neodymium iron boron permanent magnet (7) and the second neodymium iron boron permanent magnet (8) in each layer of permanent magnet are fixedly connected with the corresponding built-in arc permanent magnet (3) in a seamless mode, and the outer ends of the first neodymium iron boron permanent magnet and the second neodymium iron boron permanent magnet are flush with the outer surface of the rotor iron core (6); four arc-shaped neodymium iron boron permanent magnets (2) are uniformly pasted on the outer surface of the rotor iron core (6) along the circumferential direction, each arc-shaped permanent magnet (3) is arranged in a manner of being right opposite to the other arc-shaped permanent magnet, and the central lines of the two arc-shaped permanent magnets are collinear; the magnetizing directions of the first neodymium iron boron permanent magnet (7) and the second neodymium iron boron permanent magnet (8) are all directions from the inner end to the outer end of the first neodymium iron boron permanent magnet, the magnetizing directions of all the built-in arc-shaped permanent magnets (3) are all magnetizing from inside to outside along the direction of the central line of the built-in arc-shaped permanent magnets, and the magnetizing direction of each surface-mounted arc-shaped neodymium iron boron permanent magnet (2) is the same as the magnetizing direction of the built-in arc-shaped permanent magnet (3) opposite to the surface-mounted arc-shaped permanent magnet; the rotor iron core (6) is integrated with the centrifugal pump impeller.
2. A magnetic levitation permanent magnet foil motor as recited in claim 1, adapted for use in a centrifugal pump system, wherein: the surface-mounted arc-shaped permanent magnet (2) and the built-in arc-shaped permanent magnet (3) are made of NdFe30 NdFeB materials, and the first NdFeB permanent magnet (7) and the second NdFeB permanent magnet (8) are made of NdFe35 NdFeB materials.
3. A magnetic levitation permanent magnet sheet motor as recited in claim 1, adapted for use in a centrifugal pump system, wherein: the outer surfaces of the four surface-mounted circular arc neodymium iron boron permanent magnets (2) are sleeved with a rotor protective sleeve (4), the rotor protective sleeve (4) is of a cylindrical structure made of a mesh-shaped fiber material, and the shape of the rotor protective sleeve is a thread shape.
4. A magnetic levitation permanent magnet foil motor as recited in claim 1, adapted for use in a centrifugal pump system, wherein: the n layers of permanent magnets are arranged at intervals along the radial direction, and the distance between every two adjacent layers of permanent magnets is equal.
5. A magnetic levitation permanent magnet sheet motor as recited in claim 1, adapted for use in a centrifugal pump system, wherein: n first neodymium iron boron permanent magnets (7) in n layers of permanent magnets are parallel to each other, and n second neodymium iron boron permanent magnets (8) in n layers of permanent magnets are parallel to each other.
6. A magnetic levitation permanent magnet foil motor as recited in claim 1, adapted for use in a centrifugal pump system, wherein: the radian occupied by each built-in arc-shaped permanent magnet (3) is 120 degrees, and the included angle between the first neodymium iron boron permanent magnet (7) and the second neodymium iron boron permanent magnet (8) in each layer of permanent magnet is 60 degrees.
7. A magnetic levitation permanent magnet foil motor as recited in claim 1, adapted for use in a centrifugal pump system, wherein: the same distance of 2mm is arranged between two adjacent first neodymium iron boron permanent magnets (7) in the two adjacent layers of permanent magnets and between two adjacent second neodymium iron boron permanent magnets (8).
8. A magnetic levitation permanent magnet foil motor as recited in claim 1, adapted for use in a centrifugal pump system, wherein: the radial thickness of each circular arc neodymium iron boron permanent magnet (2) is 4mm.
9. A magnetic levitation permanent magnet foil motor as recited in claim 1, adapted for use in a centrifugal pump system, wherein: and resin is filled between every two adjacent surface-mounted circular arc permanent magnets (2).
10. A magnetic levitation permanent magnet foil motor as recited in claim 1, adapted for use in a centrifugal pump system, wherein: the pole arc coefficient of each arc neodymium iron boron permanent magnet (2) is 0.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210992309.8A CN115733266A (en) | 2022-08-18 | 2022-08-18 | Magnetic suspension permanent magnet sheet motor suitable for centrifugal pump system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210992309.8A CN115733266A (en) | 2022-08-18 | 2022-08-18 | Magnetic suspension permanent magnet sheet motor suitable for centrifugal pump system |
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| CN115733266A true CN115733266A (en) | 2023-03-03 |
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| CN202210992309.8A Pending CN115733266A (en) | 2022-08-18 | 2022-08-18 | Magnetic suspension permanent magnet sheet motor suitable for centrifugal pump system |
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2022
- 2022-08-18 CN CN202210992309.8A patent/CN115733266A/en active Pending
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Inventor after: Zhao Ruijie Inventor after: Chen Xiaodan Inventor after: Wu Ao Inventor after: Xu Enxiang Inventor before: Chen Xiaodan Inventor before: Zhao Ruijie Inventor before: Wu Ao Inventor before: Xu Enxiang |