CN113824226B - Alternating pole local HALBACH structure less rare earth mixed permanent magnet motor - Google Patents

Alternating pole local HALBACH structure less rare earth mixed permanent magnet motor Download PDF

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CN113824226B
CN113824226B CN202110977952.9A CN202110977952A CN113824226B CN 113824226 B CN113824226 B CN 113824226B CN 202110977952 A CN202110977952 A CN 202110977952A CN 113824226 B CN113824226 B CN 113824226B
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permanent magnet
ferrite
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iron boron
neodymium iron
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CN113824226A (en
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陈云云
蔡同乐
李敏艳
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Yangzhou University
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Yangzhou University
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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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2746—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets arranged with the same polarity, e.g. consequent pole type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • 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

The invention discloses a rare earth mixed permanent magnet motor with an alternating pole local HALBACH structure, wherein an arc-shaped through groove is formed in the outer wall of a rotor, a first neodymium iron boron permanent magnet is placed in the arc-shaped through groove, ferrite permanent magnets are arranged on the side faces of the rotor, and a second neodymium iron boron permanent magnet is arranged at the top of each ferrite permanent magnet. And the top of the second neodymium iron boron permanent magnet is provided with a hammer-shaped magnetic barrier. The bottom of the ferrite permanent magnet is provided with an annular through groove, the inner wall of the annular through groove is provided with first fan-shaped ferrite permanent magnets and second fan-shaped ferrite permanent magnets in a staggered mode according to a HALBACH structure, and the number of the ferrite permanent magnets, the number of the first fan-shaped ferrite permanent magnets and the number of the second fan-shaped ferrite permanent magnets are equal. The structure of the invention not only can fully utilize the internal space of the rotor and ensure the torque output performance of the motor, but also can effectively improve the utilization rate of the permanent magnet and reduce the cost of the rare earth permanent magnet material of the motor.

Description

Alternating-pole local HALBACH structure less rare earth mixed permanent magnet motor
Technical Field
The invention relates to a rare earth-less hybrid permanent magnet motor with an alternate pole local HALBACH structure, and belongs to the technical field of permanent magnet motors.
Background
The rare earth permanent magnet motor with the advantages of high efficiency, high power density and the like is widely applied to the industrial field, but the rare earth material is unstable in supply and large in price fluctuation, the manufacturing cost of the permanent magnet motor is seriously influenced, and the further large-scale application of the rare earth permanent magnet motor is hindered. So that many motor manufacturers are dedicated to deep utilization of permanent magnet materials in rare earth permanent magnet motors and even research and develop zero rare earth permanent magnet motors.
The non-rare earth ferrite has the advantages of low price, easily obtained materials and the like, and is the most direct solution for removing rare earth of the permanent magnet motor, but because the magnetic property of the ferrite is far lower than that of rare earth permanent magnet materials such as neodymium iron boron and the like, in order to ensure the torque output capacity of the motor, the ferrite permanent magnet motor mostly adopts a spoke type structure with a magnetism gathering effect, and usually needs to select a ferrite permanent magnet material with a larger size, so that the size of the motor is increased undoubtedly, and the torque and the power density of the motor are reduced. It can be seen that, in terms of torque output performance of the motor, the rare-earth permanent magnet material cannot be completely replaced by the non-rare-earth ferrite material, and therefore, a small amount of rare-earth material is added to the rare-earth ferrite material to form the rare-earth-less hybrid permanent magnet motor.
Because the rare earth permanent magnet material and the non-rare earth permanent magnet material are adopted in the rare earth-less hybrid permanent magnet motor, different magnetic circuit forms of series connection, parallel connection and series-parallel connection hybrid can be formed by flexibly placing two permanent magnet materials with different magnetic characteristics, and the performance of the motor has advantages and disadvantages due to different dosage ratios. In the split combined permanent magnet brushless motor and the hybrid permanent magnet motor with high torque density proposed in the prior art, large-size non-rare earth ferrite and a small amount of rare earth neodymium iron boron are adopted in the rotor, and the purpose of reducing the dosage of rare earth materials while ensuring the torque output performance is achieved by optimizing and proportioning the dosage of two permanent magnet materials. But the simple parallel spoke type structure and the placement scheme of the built-in V-shaped permanent magnet material are combined to form a single parallel magnetic circuit or a single series magnetic circuit, so that the motor can only be optimized in the aspects of torque density and demagnetization resistance. In addition, there is a need for further rational optimization of design in view of both the flux leakage suppression of the permanent magnet material and the utilization of the internal space of the rotor. The stator partition type hybrid permanent magnet motor provided in the prior art places hybrid permanent magnets in an inner stator after partition, makes full use of the inner space of the motor, but the motor with the structure has double layers of air gaps, so that the motor is complex in structure and difficult to assemble.
Therefore, in the prior art, for a rare earth-less hybrid permanent magnet motor, there is a problem to be solved in advance how to reasonably design the structure of the motor, optimize the dosage ratios and the placement schemes of different permanent magnet materials to deeply utilize the permanent magnet materials, and further reduce the dosage of rare earth permanent magnets while ensuring the motor capacity.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides the rare earth mixed permanent magnet motor with the alternating pole local HALBACH structure and less rare earth, so that the utilization rate of the permanent magnet material is improved, the torque output performance of the motor is ensured, and the dosage of the rare earth permanent magnet material is reduced as much as possible.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the utility model provides a local HALBACH structure of local HALBACH few tombarthite hybrid permanent magnet machine, which comprises a stator and a rotor, it leads to the groove to have seted up convex on the rotor outer wall, the first neodymium iron boron permanent magnet of shape matched with has been placed to convex logical inslot, the first rectangle that all sets up perpendicular circumferencial direction on the rotor side of first neodymium iron boron permanent magnet both sides leads to the groove, first rectangle leads to inslot and places shape matched with ferrite permanent magnet, the second rectangle that perpendicular circumferencial direction was seted up at ferrite permanent magnet top leads to the groove, the second rectangle leads to the inslot and places shape matched with second neodymium iron boron permanent magnet. And the top of the second neodymium iron boron permanent magnet is provided with a hammer-shaped magnetic barrier. The bottom of the ferrite permanent magnet is provided with a circular through groove, the inner wall of the circular through groove is provided with first fan-shaped ferrite permanent magnets and second fan-shaped ferrite permanent magnets in a staggered mode according to an HALBACH structure, and the number of the ferrite permanent magnets, the number of the first fan-shaped ferrite permanent magnets and the number of the second fan-shaped ferrite permanent magnets are equal.
As a preferred scheme, the number of the first neodymium iron boron permanent magnets is the same as the number of pole pairs of the permanent magnet motor; the first neodymium iron boron permanent magnets are uniformly distributed on the outer wall of the rotor.
Preferably, the hammer-type magnetic barrier comprises a horizontal part and an inclined part, wherein the inclined part is connected to one end of the horizontal part, and a protruding part is arranged at the bottom of the horizontal part.
Preferably, the fan-shaped included angle of the first neodymium iron boron permanent magnet relative to the center of the rotating shaft is 19-25 degrees, and the ratio of the thickness h4 of the first neodymium iron boron permanent magnet to the height h5 of the second neodymium iron boron permanent magnet is 0.2-0.6: 1.
As a preferred scheme, ferrite permanent magnets are symmetrically arranged on two sides of the central axis of the first NdFeB permanent magnet, and the number ratio of the ferrite permanent magnets to the first NdFeB permanent magnet is 2: 1.
As a preferred scheme, the centers of the second ndfeb permanent magnet and the ferrite permanent magnet are aligned along the axis, and the width to height ratio of the second ndfeb permanent magnet and the ferrite permanent magnet can be obtained by the following formula:
Figure BDA0003226543070000021
Figure BDA0003226543070000022
wherein Λ isN、ΛFDenotes the permeance, mu, of the second Nd-Fe-B permanent magnet and the ferrite permanent magnetN、μFDenotes the permeability, H, of the second NdFeB permanent magnet and the ferrite permanent magnetcN、HcFThe coercive force of the second neodymium iron boron permanent magnet and the ferrite permanent magnet is shown, h5 and h6 show the height of the second neodymium iron boron permanent magnet and the ferrite permanent magnet, and W1 and W2 show the width of the second neodymium iron boron permanent magnet and the ferrite permanent magnet; the number of the second neodymium iron boron permanent magnets is the same as that of the ferrite permanent magnets.
Preferably, the ratio of the height h2 of the horizontal part of the hammer-shaped magnetic barrier to the height h5 of the second neodymium iron boron permanent magnet is 0.1-0.25:1, and the ratio of the width W4 of the horizontal part to the width W1 of the second neodymium iron boron permanent magnet is 1.7-2.3: 1; the ratio of the height h1 of the hammer-shaped magnetic barrier protrusion to the height h5 of the second neodymium iron boron permanent magnet is 0.01-0.05: 1; the ratio of the width W3 of the convex part to the width W1 of the second NdFeB permanent magnet is 0.2-0.6: 1; the horizontal included angle alpha of the inclined part of the hammer-shaped magnetic barrier is 30-45 degrees; the ratio of the inclined portion width W5 to the horizontal portion width W4 is 0.6-0.65: 1; the height h3 of the inclined portion is the same as the height h2 of the horizontal portion.
As a preferred scheme, the central point of the first fan-shaped ferrite permanent magnet and the central point of the first neodymium iron boron permanent magnet are positioned on the same axis, and the second fan-shaped ferrite permanent magnets are distributed on two sides of the first fan-shaped ferrite permanent magnet; the thicknesses of the first fan-shaped ferrite permanent magnet and the second fan-shaped ferrite permanent magnet are the same, and the ratio of the thickness of the fan-shaped ferrite to the height h6 of the ferrite permanent magnet is 0.24-0.3: 1; a first interval is arranged between the top end of the second fan-shaped ferrite and the bottom of the ferrite permanent magnet, the first interval is set to be 0.5mm, a second interval between the bottom end of the second fan-shaped ferrite and the inner diameter of the rotor is set to be 1-2mm, a fan-shaped included angle beta of the first fan-shaped ferrite permanent magnet relative to the central point of the rotating shaft is 24 degrees, and a fan-shaped included angle gamma of the second fan-shaped ferrite permanent magnet relative to the central point of the rotating shaft is 12 degrees.
As a preferred scheme, the second neodymium iron boron permanent magnet and the ferrite permanent magnet are magnetized in a tangential direction, the magnetizing directions point to the first neodymium iron boron permanent magnet, the magnetizing directions of the first neodymium iron boron permanent magnet are the same and point to the stator, the first sector ferrite adopts the up-down magnetizing direction, and the second sector ferrite adopts the tangential magnetizing relative to the first sector ferrite and points to the first neodymium iron boron permanent magnet.
Preferably, the windings in the stator are arranged in a fractional slot concentrated winding structure.
Has the advantages that: compared with the prior art, the rare earth-less hybrid permanent magnet motor with the alternating pole local HALBACH structure provided by the invention has the following technical effects:
1. a small amount of rectangular neodymium iron boron permanent magnets are placed above the rectangular ferrite, and the two permanent magnets jointly form a parallel magnetic circuit, so that the torque output capacity is enhanced, and the amplitude of air gap flux density and the inductance performance of the motor are improved.
2. The unidirectional magnetized interpolation type arc neodymium iron boron permanent magnet is placed in the middle of the rectangular ferrite, the adjacent iron core is magnetized by the arc neodymium iron boron permanent magnet to form alternate poles with the other polarity, and the arc neodymium iron boron permanent magnet and the rectangular ferrite form a mixed series-parallel magnetic circuit structure, so that the utilization rate of permanent magnet materials is improved, and meanwhile, the torque output performance of the motor and the demagnetization resistance of the permanent magnet are considered.
3. The hammer-shaped magnetic barrier is arranged at the top end of the rectangular neodymium iron boron permanent magnet, so that torque pulsation can be effectively reduced; the included angle between the inclined plane of the front part of the hammer-shaped magnetic barrier and the top is alpha, the alpha is 30-45 degrees, the existence of the inclined plane is beneficial to improving the trend of magnetic lines of force, and the magnetic flux leakage of the tooth part is reduced.
4. The first fan-shaped ferrite and the second fan-shaped ferrite are arranged near the rotating shaft, the radian ratio of the first fan-shaped ferrite to the second fan-shaped ferrite is 2:1, the two fan-shaped ferrites are placed in an HALBACH structure, and the difference of the radians of the two fan-shaped ferrites is beneficial to generating a stronger unilateral magnetic field, improving the torque characteristic and reducing the magnetic leakage at the end part of the ferrite permanent magnet.
In conclusion, the invention provides the alternating-pole local HALBACH structure rare-earth-less hybrid permanent magnet motor, which not only can fully utilize the internal space of the rotor and ensure the torque output performance of the motor, but also can effectively improve the utilization rate of the permanent magnet and reduce the rare-earth permanent magnet material cost of the motor.
Drawings
Fig. 1 is a schematic structural diagram of a low-rare earth mixed permanent magnet motor with an alternating pole local HALBACH structure.
Fig. 2 is a schematic structural view of the rotor.
Fig. 3 is a front view of the hammer type magnetic barrier.
Fig. 4 is a front view structural diagram of the first neodymium-iron-boron permanent magnet.
Fig. 5 is a front structural view of a second neodymium-iron-boron permanent magnet and a ferrite permanent magnet.
Fig. 6 is a front view structural diagram of the hammer type magnetic barrier and the second ndfeb permanent magnet.
FIG. 7 is a HALBACH structure diagram of a fan-shaped ferrite permanent magnet.
Fig. 8 is a schematic view of the magnetization direction of the rare-earth-less hybrid permanent magnet motor with the alternate pole local HALBACH structure, wherein the arrow points to indicate the magnetization direction.
Fig. 9 is a magnetic line distribution diagram of the alternating pole local HALBACH structure rare earth-less hybrid permanent magnet motor.
Detailed Description
The present invention will be further described with reference to the following examples.
As shown in fig. 1-2, a local little tombarthite hybrid permanent magnet machine of HALBACH structure of alternating pole, including stator 1 and rotor 2, rotor 2 has seted up on the outer wall convex logical groove, circular arc leads to the inslot and has placed shape matched with first neodymium iron boron permanent magnet 7, the first rectangle that all sets up perpendicular circumferencial direction on the rotor side of first neodymium iron boron permanent magnet 7 both sides leads to the groove, first rectangle leads to the inslot and has placed shape matched with ferrite permanent magnet 5, the second rectangle that perpendicular circumferencial direction leads to the groove is seted up at ferrite permanent magnet 5 top, the second rectangle leads to the inslot and has placed shape matched with second neodymium iron boron permanent magnet 4. And the top of the second neodymium iron boron permanent magnet 4 is provided with a hammer-shaped magnetic barrier 6. The bottom of the ferrite permanent magnet 5 is provided with an annular through groove, the inner wall of the annular through groove is provided with first fan-shaped ferrite permanent magnets 8 and second fan-shaped ferrite permanent magnets 9 in a staggered mode according to a HALBACH structure, and the number of the ferrite permanent magnets 5, the number of the first fan-shaped ferrite permanent magnets 8 and the number of the second fan-shaped ferrite permanent magnets 9 are equal.
The number of the first neodymium iron boron permanent magnets 7 is the same as the number of pole pairs of the permanent magnet motor. First neodymium iron boron permanent magnet 7 is even distributes on 2 outer walls of rotor.
As shown in fig. 3, the hammer type magnetic barrier 6 includes a horizontal portion 601, and an inclined portion 602, one end of the horizontal portion 601 is connected to the inclined portion 602, and a protrusion 603 is provided at the bottom of the horizontal portion 601.
As shown in fig. 4, the fan-shaped included angle of the first ndfeb permanent magnet 7 relative to the center of the rotating shaft is 19 to 25 °, the ratio of the thickness h4 of the first ndfeb permanent magnet 7 to the height h5 of the second ndfeb permanent magnet is 0.2 to 0.6:1, and the torque output capability of the first ndfeb permanent magnet 7 in unit volume is favorably ensured. In addition, the first neodymium iron boron permanent magnet 7 and the alternating poles formed by the adjacent rotor iron core can make full use of harmonic waves to generate larger output torque, and the utilization rate of the permanent magnet material is improved.
Ferrite permanent magnets 5 are symmetrically arranged on two sides of the central axis of the first neodymium iron boron permanent magnet 7, and the number ratio of the ferrite permanent magnets 5 to the first neodymium iron boron permanent magnet 7 is 2: 1.
As shown in fig. 5, the centers of the second ndfeb permanent magnet 4 and the ferrite permanent magnet 5 are aligned along the axis, when the permanent magnet works at an ideal working point, the magnetic field strength at the working point of the second ndfeb permanent magnet 4 and the ferrite permanent magnet 5 is close to 0, and at this time, the width and height ratio of the second ndfeb permanent magnet 4 and the ferrite permanent magnet 5 can be obtained by the following formula:
Figure BDA0003226543070000051
Figure BDA0003226543070000052
wherein the content of the first and second substances,ΛN、ΛFdenotes the permeance, mu, of the second Nd-Fe-B permanent magnet 4 and the ferrite permanent magnet 5N、μFDenotes the permeability, H, of the second NdFeB permanent magnet 4 and the ferrite permanent magnet 5cN、HcFThe coercive force of the second neodymium-iron-boron permanent magnet 4 and the ferrite permanent magnet 5 is shown. The second neodymium iron boron permanent magnet is small in size and strong in magnetism, and is placed on the top of the ferrite permanent magnet, so that the improvement of the air gap flux density amplitude and the motor inductance characteristic is facilitated. In addition, the second neodymium iron boron permanent magnet, the ferrite permanent magnet and the first neodymium iron boron permanent magnet adopt a series-parallel mixed magnetic circuit structure, so that the torque output performance and the demagnetization resistance of the permanent magnet can be effectively considered.
As shown in fig. 6, the top of the second ndfeb permanent magnet 4 is provided with a hammer-shaped magnetic barrier 6, the ratio of the height h2 of the horizontal part 601 of the hammer-shaped magnetic barrier 6 to the height h5 of the second ndfeb permanent magnet 4 is 0.1-0.25:1, and the ratio of the width W4 of the horizontal part 601 to the width W1 of the second ndfeb permanent magnet 4 is 1.7-2.3: 1; the provision of the horizontal portion 601 can reduce torque ripple while securing torque output capability. The ratio of the height h1 of the bulge 603 of the hammer-shaped magnetic barrier 6 to the height h5 of the second neodymium iron boron permanent magnet 4 is 0.01-0.05: 1; the ratio of the width W3 of the projection 603 to the width W1 of the second NdFeB permanent magnet is 0.2-0.6: 1; the arrangement of the convex part 603 is not only beneficial to fixing the position of the permanent magnet and preventing the permanent magnet from falling off, but also ensures the inductance performance of the motor. The horizontal included angle alpha of the inclined part 602 of the hammer-shaped magnetic barrier 6 is 30-45 degrees; the ratio of the width W5 of the inclined part 602 to the width W4 of the horizontal part 601 is 0.6-0.65: 1; the height h3 of the inclined portion 602 is the same as the height h2 of the horizontal portion 601. The design of the hammer-shaped magnetic barrier can effectively reduce the torque pulsation of the motor, and the design of the front part of the inclined plane is beneficial to reducing the magnetic leakage of the tooth part and improving the utilization rate of the permanent magnet.
As shown in fig. 7, the central point of the first fan-shaped ferrite permanent magnet 8 and the central point of the first ndfeb permanent magnet 7 are located on the same axis, and the second fan-shaped ferrite permanent magnets 9 are distributed on both sides of the first fan-shaped ferrite permanent magnet 8. The thicknesses of the first fan-shaped ferrite permanent magnet 8 and the second fan-shaped ferrite permanent magnet 9 are the same, and the ratio of the thickness of the fan-shaped ferrite to the height h6 of the ferrite permanent magnet 5 is 0.24-0.3: 1; the torque output performance of the motor is considered while the low torque pulsation is ensured. A gap is arranged between the top end of the second fan-shaped ferrite 9 and the bottom of the ferrite permanent magnet 5, and the gap is set to be 0.5mm, so that the magnetic force line passes through the fan-shaped ferrite permanent magnet, and the utilization rate of the permanent magnet is improved; the interval between the bottom end of the second fan-shaped ferrite 9 and the inner diameter of the rotor is set to be 1-2mm, so that the space of the rotor is fully utilized, and the magnetic leakage at the end part of the ferrite is reduced. The sector angle beta of the first sector-shaped ferrite permanent magnet relative to the central point of the rotating shaft is 24 degrees, and the sector angle gamma of the second sector-shaped ferrite permanent magnet relative to the central point of the rotating shaft is 12 degrees. Different designs of the fan-shaped included angle can fully utilize the HALBACH structure to generate a stronger unilateral magnetic field, improve the torque characteristic of the motor and reduce the end magnetic flux leakage generated by ferrite.
The magnetization directions of the permanent magnets are as shown in fig. 8, the second neodymium iron boron permanent magnet 4 and the ferrite permanent magnet 5 are magnetized tangentially, the magnetization directions point to the first neodymium iron boron permanent magnet 7, and the second neodymium iron boron permanent magnet 4 and the ferrite permanent magnet 5 form a parallel magnetic circuit structure, so that the torque output capacity of the motor is effectively enhanced; the first neodymium iron boron permanent magnet 7 has the same magnetization direction and points to the stator, and forms a series-parallel mixed magnetic circuit with the second neodymium iron boron permanent magnet 4 and the ferrite permanent magnet 5, so that the demagnetization resistance of the permanent magnets is improved while the output capacity is ensured; the first fan-shaped ferrite 8 adopts the up-down magnetizing direction, the second fan-shaped ferrite 9 adopts tangential magnetizing relative to the first fan-shaped ferrite and points to the first neodymium iron boron permanent magnet 7, the trend of magnetic lines of force can be effectively improved, and a stronger unilateral magnetic field is formed.
The winding 3 in the stator is arranged according to a fractional slot centralized winding structure, so that the coil inserting is convenient, the length of the end part of the coil can be effectively reduced, and the torque pulsation is reduced.
The magnetic line of force of the motor is as shown in fig. 9, and the magnetic line of force passes through the stator teeth from the first ndfeb permanent magnet, passes through the second ndfeb permanent magnet, the ferrite permanent magnet and the HALBACH structure, and returns to the first ndfeb permanent magnet to form a complete closed loop. The bottom HALBACH structure and the hammer-shaped magnetic barrier effectively reduce magnetic leakage and improve the utilization rate of the permanent magnet.
The invention provides a rare earth mixed permanent magnet motor with a local HALBACH structure and less rare earth, which not only can fully utilize the internal space of a rotor and ensure the torque output performance of the motor, but also can effectively improve the utilization rate of a permanent magnet, reduce the consumption of rare earth permanent magnet materials and save the cost.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention.

Claims (10)

1. The utility model provides a few rare earth hybrid permanent magnet motor of local HALBACH structure of alternating pole, includes stator and rotor, its characterized in that: the rotor outer wall is provided with an arc-shaped through groove, a first neodymium iron boron permanent magnet with matched shape is placed in the arc-shaped through groove, the side faces of the rotor at the two sides of the first neodymium iron boron permanent magnet are respectively provided with a first rectangular through groove vertical to the circumferential direction, a ferrite permanent magnet with matched shape is placed in the first rectangular through groove, the top of the ferrite permanent magnet is provided with a second rectangular through groove vertical to the circumferential direction, a second neodymium iron boron permanent magnet with matched shape is placed in the second rectangular through groove, the top of the second neodymium iron boron permanent magnet is provided with a hammer-shaped magnetic barrier, the bottom of the ferrite permanent magnet is provided with a circular-ring-shaped through groove, the inner wall of the annular through groove is provided with a first fan-shaped ferrite permanent magnet and a second fan-shaped ferrite permanent magnet in a staggered manner according to an HALBACH structure, the number of the ferrite permanent magnets, the number of the first fan-shaped ferrite permanent magnets and the number of the second fan-shaped ferrite permanent magnets are equal.
2. The alternating-pole local HALBACH structure rare-earth-less hybrid permanent magnet machine of claim 1, wherein: the number of the first neodymium iron boron permanent magnets is the same as the number of pole pairs of the permanent magnet motor; the first neodymium iron boron permanent magnets are evenly distributed on the outer wall of the rotor.
3. The alternating-pole local HALBACH structure rare-earth-less hybrid permanent magnet machine of claim 1, wherein: the hammer type magnetic barrier comprises a horizontal part and an inclined part, wherein one end of the horizontal part is connected with the inclined part, and a protruding part is arranged at the bottom of the horizontal part.
4. The few-rare earth hybrid permanent magnet motor of alternating pole local HALBACH structure of claim 3, wherein: the fan-shaped included angle of the first neodymium iron boron permanent magnet relative to the center of the rotating shaft is 19-25 degrees, and the ratio of the thickness h4 of the first neodymium iron boron permanent magnet to the height h5 of the second neodymium iron boron permanent magnet is 0.2-0.6: 1.
5. The alternating-pole local HALBACH structure rare-earth-less hybrid permanent magnet machine of claim 1, wherein: ferrite permanent magnets are symmetrically arranged on two sides of the central axis of the first neodymium iron boron permanent magnet, and the number ratio of the ferrite permanent magnets to the first neodymium iron boron permanent magnet is 2: 1.
6. The alternating-pole local HALBACH structure rare-earth-poor hybrid permanent magnet machine of claim 1, wherein: the center of second neodymium iron boron permanent magnet and ferrite permanent magnet aligns along the axis, and the width and the height ratio of second neodymium iron boron permanent magnet and ferrite permanent magnet can be obtained by the following formula:
Figure FDA0003226543060000011
Figure FDA0003226543060000012
wherein, ΛN、ΛFDenotes the magnetic conductance, mu, of the second NdFeB permanent magnet and the ferrite permanent magnetN、μFDenotes the permeability, H, of the second NdFeB permanent magnet and the ferrite permanent magnetcN、HcFThe coercive force of the second Nd-Fe-B permanent magnet and the ferrite permanent magnet is shown, h5 and h6 show the height of the second Nd-Fe-B permanent magnet and the ferrite permanent magnet, and W1 and W2 show the height of the second Nd-Fe-B permanent magnet and the ferrite permanent magnetThe width of the body; the number of the second neodymium iron boron permanent magnets is the same as that of the ferrite permanent magnets.
7. The few-rare earth hybrid permanent magnet motor of alternating pole local HALBACH structure of claim 3, wherein: the ratio of the height h2 of the horizontal part of the hammer-shaped magnetic barrier to the height h5 of the second neodymium iron boron permanent magnet is 0.1-0.25:1, and the ratio of the width W4 of the horizontal part to the width W1 of the second neodymium iron boron permanent magnet is 1.7-2.3: 1; the ratio of the height h1 of the hammer-shaped magnetic barrier protrusion to the height h5 of the second neodymium-iron-boron permanent magnet is 0.01-0.05: 1; the ratio of the width W3 of the convex part to the width W1 of the second neodymium iron boron permanent magnet is 0.2-0.6: 1; the horizontal included angle alpha of the inclined part of the hammer-shaped magnetic barrier is 30-45 degrees; the ratio of the inclined portion width W5 to the horizontal portion width W4 is 0.6-0.65: 1; the height h3 of the inclined portion is the same as the height h2 of the horizontal portion.
8. The alternating-pole local HALBACH structure rare-earth-less hybrid permanent magnet machine of claim 1, wherein: the center point of the first fan-shaped ferrite permanent magnet and the center point of the first neodymium iron boron permanent magnet are positioned on the same axis, and the second fan-shaped ferrite permanent magnets are distributed on two sides of the first fan-shaped ferrite permanent magnet; the thicknesses of the first fan-shaped ferrite permanent magnet and the second fan-shaped ferrite permanent magnet are the same, and the ratio of the thickness of the fan-shaped ferrite to the height h6 of the ferrite permanent magnet is 0.24-0.3: 1; a first interval is arranged between the top end of the second fan-shaped ferrite and the bottom of the ferrite permanent magnet, the first interval is set to be 0.5mm, a second interval between the bottom end of the second fan-shaped ferrite and the inner diameter of the rotor is set to be 1-2mm, a fan-shaped included angle beta of the first fan-shaped ferrite permanent magnet relative to the central point of the rotating shaft is 24 degrees, and a fan-shaped included angle gamma of the second fan-shaped ferrite permanent magnet relative to the central point of the rotating shaft is 12 degrees.
9. The alternating-pole local HALBACH structure rare-earth-poor hybrid permanent magnet machine of claim 1, wherein: the second neodymium iron boron permanent magnet and the ferrite permanent magnet are magnetized in a tangential direction, the magnetizing direction points to the first neodymium iron boron permanent magnet, the magnetizing directions of the first neodymium iron boron permanent magnet are the same and all point to the stator, the first sector ferrite adopts the up-down magnetizing direction, and the second sector ferrite adopts tangential magnetization relative to the first sector ferrite and points to the first neodymium iron boron permanent magnet.
10. The alternating-pole local HALBACH structure rare-earth-poor hybrid permanent magnet machine of claim 1, wherein: the windings in the stator are arranged in a fractional slot concentrated winding structure.
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