CN108736608A - The rotor structure and its manufacturing method of Halbach motors - Google Patents

Abstract

The invention provides a rotor structure of a Halbach motor, which includes N-pole magnets, S-pole magnets and a rotating shaft, the N-pole magnets include N-pole magnets and N-pole magnets, and the S-pole magnets include There are S extremely large magnets and S extremely small magnets, and are specifically limited: in the N extremely small magnets, the magnetic lines of force are parallel to the radial tangential diagonals of the N extremely small magnets or have an acute angle. In the extremely small magnetic steel, its magnetic force line is parallel to or has an acute angle with the radial tangent diagonal of the S extremely small magnetic steel. The invention also provides a manufacturing method of the rotor structure of the Halbach motor. The present invention has the following improvement advantages: the structure and shape of the permanent magnet constituting the magnetic group is simple, and its processing difficulty is low; the installation and operation are simple and convenient, the production efficiency of the motor is high, and the product consistency is improved; the structural limit of the magnetic group can eliminate the need for assembly. Accumulate errors to improve motor performance; the permanent magnet has a larger cross-sectional area and a longer internal magnetic circuit of the permanent magnet, thereby improving the anti-demagnetization ability of the motor.

Description

Rotor structure of Halbach motor and its manufacturing method

technical field

The invention relates to the technical field of motor equipment, and more specifically relates to a rotor mechanism of a Halbach motor and a manufacturing method thereof.

Background technique

The Halbach motor is a motor using the Halbach array magnet structure. The Halbach array magnet structure is an almost ideal magnet structure in engineering. The design goal of this structure is to generate the strongest magnetic field with the least amount of magnets.

The Halbach array magnet structure uses a special arrangement of magnet units to enhance the field strength of the magnet unit in one direction.

The Halbach rotor structure is applied to permanent magnet motors, which can build a special motor magnetic field circuit, which can remove the rotor magnetic yoke structure of the motor, increase the air gap magnetic density, optimize the air gap waveform, effectively improve the performance of the motor, reduce the Small motor weight, lower product cost.

In the existing technology, the traditional Halbach rotor is composed of N-pole magnets, S-pole magnets and a rotating shaft. The N-pole magnets and S-pole magnets adopt a flat structure, and the N-pole magnets or S-pole magnets are attached to the rotating shaft. , There is a line contact between the patch (N-pole magnet, S-pole magnet) and the rotating shaft. Due to the difficulty of patching, the patching operation is usually done manually, and the manual patching operation will cause the error accumulation of the patch. Due to the complex structure of the Halbach rotor, there are problems such as poor manufacturability and inflexible design. It is precisely the existence of these problems that the Halbach rotor cannot be mass-produced, and even the performance of small-scale production is poor.

To sum up, due to unreasonable structural design and cumbersome processing technology, the advantages of the Halbach rotor structure cannot be applied to actual production.

Contents of the invention

The purpose of the present invention is to provide a Halbach motor with reasonable structural design and low manufacturing difficulty.

In order to achieve the above object, the present invention provides the following technical solutions:

A rotor structure of a Halbach motor includes N-pole magnetic steel, S-pole magnetic steel and a rotating shaft. In the present invention, the rotating shaft is a circular shaft structure; the N pole magnet includes a N pole magnet and an N pole magnet, and the radial section of the N pole magnet is isosceles trapezoidal, so The top surface of the N extremely large magnet is the first bonding surface, and the N extremely large magnet is pasted on the rotating shaft through the first bonding surface, and the radial section of the N extremely small magnet is Rectangular, in the N extremely small magnetic steel, its magnetic force line is parallel to the radial sectional diagonal line of the N extremely small magnetic steel or has an acute angle, and one side of the N extremely small magnetic steel is the second Fitting surface, the N extremely small magnet is pasted on the rotating shaft through the second fitting surface, one side surface of the N extremely small magnet and the side surface of the N extremely large magnet connected, the two sides of the N pole magnet are each provided with the same number of one or more N pole magnets and form N pole magnetic groups; the S pole magnets include S pole magnets steel and S extremely small magnets, the radial section of the S extremely large magnets is isosceles trapezoidal, the top surface of the S extremely large magnets is the third bonding surface, and the S extremely large magnets pass through the The third bonding surface is pasted on the rotating shaft, the radial section of the S extremely small magnet is rectangular, and in the S extremely small magnet, the magnetic force line is in line with the radial direction of the S extremely small magnet. The cut diagonals are parallel or have an acute angle, one side of the S extremely small magnetic steel is the fourth bonding surface, and the S extremely small magnetic steel is pasted on the rotating shaft through the fourth bonding surface , one side of the S extremely small magnet is connected to the side of the S extremely large magnet, and the two sides of the S extremely large magnet are each provided with the same number of one or more of the The S pole magnetic steel is formed with an S pole magnetic group; there are multiple N pole magnetic groups, and there are multiple S pole magnetic groups, and the N pole magnetic group and the S pole magnetic group are arranged interspersed And a rotor magnetic group with a cylindrical structure is formed around the rotating shaft.

Preferably, an additional layer is provided on the side of the maximum N magnet, the N minimum magnet, the S maximum magnet, and the S minimum magnet on the side facing away from the rotating shaft, so that The outer surface of the additional layer is a smooth curved surface, and the inner surface of the additional layer is connected with the N extremely large magnet, the N extremely small magnet, the S extremely large magnet, and the S extremely small magnet ; The outer surface of the rotor magnetic group is provided with the additional layer and forms a circular curved surface structure.

Preferably, the additional layer is disposed on the N maximum magnet, the N minimum magnet, the S maximum magnet, and the S minimum magnet to form an integrated structure.

The present invention also provides a kind of manufacture method of the rotor structure of Halbach motor, and this method comprises the steps:

Step 1, preparing N maximum magnets and S maximum magnets whose radial section is isosceles trapezoidal by cutting;

Step 2, preparing N extremely small magnets and S extremely small magnets with rectangular radial sections by cutting;

Step 3: Magnetize the N-maximum magnet and form a magnetic force line perpendicular to its top or bottom surface in the N-maximum magnet, magnetize the S-maximum magnet and A magnetic force line perpendicular to its top or bottom surface is formed in the S extremely large magnet, and the N extremely small magnet is magnetized and a tangential plane parallel to its radial direction is formed in the N extremely small magnet. Angular line or a magnetic field line with an acute angle with its radial tangent diagonal, magnetize the S extremely small magnetic steel and form an angle parallel to its radial tangent in the S extremely small magnetic steel Lines or lines of magnetic force that have an acute angle with their radial tangential lines;

Step 4. Separate the N-pole small magnets to the two side surfaces of the N-max magnets and seamlessly fit the side surfaces of the N-max magnets to form an N-pole magnetic group. In the same N pole magnetic group, the magnetic force lines in the N extremely small magnet and the magnetic force lines in the N extremely large magnet form an acute angle structure, and the S extremely small magnet is divided into the S pole The two side surfaces of the large magnet steel are seamlessly attached to the side surfaces of the S pole magnet and form an S pole magnetic group. In the same S pole magnetic group, the S pole small magnet The magnetic force lines in the steel form an acute angle structure with the magnetic force lines in the S maximum magnetic steel;

Step 5, setting a rotating shaft and setting the N-pole magnetic group and the S-pole magnetic group on the outer surface of the rotating shaft, wherein the N-pole magnetic group and the S-pole magnetic group are interspersed.

Preferably, the present invention also provides a rotor magnetic group assembly tool, and the magnetic group assembly tool has a limiting slot with an isosceles trapezoidal cross section.

Preferably, the rotor magnetic group assembly tool includes a base, the limiting groove is provided on the base, and an upper cover is provided on the upper side of the base through tightening bolts;

The width of the base and the width of the upper cover are the same as the width of the N maximum magnet or the S maximum magnet.

Through the above structural design, the present invention has the following improved advantages: the permanent magnets constituting the N pole magnetic group and the S pole magnetic group have a simple structure and shape, and their processing difficulty is low; the permanent magnets constituting the N pole magnetic group and the S pole magnetic group are assembled , the installation and operation are simple and convenient, and through the pre-installed N-pole magnetic group and S-pole magnetic group, the installation accuracy of the permanent magnet is improved, the production efficiency of the Halbach motor is high, and the product consistency is improved, thereby realizing the mass production of the Halbach motor; N The structural error of the pole magnetic group and the S pole magnetic group is small, so the cumulative error in the circumferential direction generated when they are assembled on the rotating shaft is also small. In the N-pole magnetic group or the S-pole magnetic group, the bottom surface (the surface used to connect with the rotating shaft) is composed of three angled planes, and the angular positions of the three planes are consistent with the outer surface of the rotating shaft. In this way, the structural limitation of the assembly of the N-pole magnetic group or the S-pole magnetic group is carried out by three planes, which can eliminate the cumulative error, greatly optimize the sine of the air-gap flux density waveform of the Halbach structure motor, and improve the performance of the motor. In the present invention, compared with the ordinary magnetic circuit structure, the N and S magnetic groups composed of the Halbach structure have a longer distance for the magnetic circuit to flow through the permanent magnet, a larger cross-sectional area of the permanent magnet, and a longer magnetic circuit inside the permanent magnet. , thereby improving the anti-demagnetization ability of the motor.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. in:

Fig. 1 is a schematic cross-sectional structure diagram perpendicular to the rotating shaft in a Halbach rotor in an embodiment of the present invention;

Fig. 2 is a sectional view along A-A in 1;

Fig. 3 is a schematic diagram of the distribution of magnetic force lines inside each magnet in the structure of Fig. 1 based on the present invention;

FIG. 4 is a schematic structural view of an N-pole magnetic group in an embodiment of the present invention;

Fig. 5 is a structural schematic diagram of an S pole magnetic group in an embodiment of the present invention;

Fig. 6 is a schematic structural view of the rotor magnetic group assembly tool in an embodiment of the present invention;

Fig. 7 is a sectional view along B-B among Fig. 6;

Explanation of reference signs:

Shaft 1, N extremely large magnet 2, N extremely small magnet 3, S extremely large magnet 4, S extremely small magnet 5,

Base 6, tightening bolt 7, loam cake 8.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and examples. Each example is provided by way of explanation of the invention, not limitation of the invention. In fact, those skilled in the art will recognize that modifications and variations can be made in the present invention without departing from the scope or spirit of the invention. For example, features illustrated or described as part of one embodiment can be used on another embodiment to yield a still further embodiment. Therefore, it is intended that the present invention includes such modifications and variations as come within the scope of the appended claims and their equivalents.

In the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", " The orientations or positional relationships indicated by "top", "bottom", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation, so they cannot be understood as Limitations on the Invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense, for example, it can be fixedly connected or detachably connected; it can be directly connected or indirectly connected through intermediate parts, for ordinary A skilled person can understand the specific meanings of the above terms according to specific situations.

Please refer to Fig. 1 to Fig. 7, wherein, Fig. 1 is the cross-sectional structure diagram perpendicular to the rotating shaft in the Halbach rotor in an embodiment of the present invention; Fig. 2 is the sectional view along A-A in 1; Fig. 3 is the structure of the present invention based on Fig. 1 Fig. 4 is a schematic diagram of the structure of the N-pole magnetic group in an embodiment of the present invention; Fig. 5 is a structural schematic diagram of the S-pole magnetic group in an embodiment of the present invention; Fig. 6 is a schematic diagram of this Schematic diagram of the structure of the rotor magnetic group assembly tool in an embodiment of the invention; FIG. 7 is a cross-sectional view along B-B in FIG. 6 .

The technical problem to be solved by the present invention is to provide a novel Halbach rotor structure and its processing method. Through its structural design, the problem that the existing Halbach rotor cannot be produced in batches can be solved. At the same time, the present invention can also largely solve the problems of poor performance and poor consistency of the Halbach rotor structure caused by technical problems.

The Halbach rotor provided by the present invention is mainly composed of permanent magnets and a rotating shaft. In the manufacturing method of the Halbach rotor provided by the present invention, a permanent magnet forming tool and a rotor forming tool are also used.

Specifically, in the rotor structure of a Halbach motor provided by the present invention, it includes N pole magnets, S pole magnets and a rotating shaft 1, and the rotating shaft 1 is a circular shaft structure.

The present invention mainly optimizes the structure of N-pole magnets and S-pole magnets, and its specific design is as follows: N-pole magnets include N-maximum magnets 2, N-maximum magnets 3, and N-maximum magnets 2. The radial section is an isosceles trapezoid, the top surface of the N-maximum magnet 2 is the first bonding surface, the N-maximum magnet 2 is attached to the rotating shaft 1 through the first bonding surface, and the N-maximum magnet 2 The central axis is perpendicular to the axis of the rotating shaft 1, the radial section of the N extremely small magnetic steel 3 is a rectangle, and in the N extremely small magnetic steel 3, its magnetic force line is parallel to the radial sectional diagonal of the N extremely small magnetic steel 3, The central axis of N extremely small magnetic steel 3 is perpendicular to the axis of rotating shaft 1, one side of N extremely small magnetic steel 3 is the second bonding surface, and N extremely small magnetic steel 3 is attached to rotating shaft 1 through the second bonding surface , one side of the N extremely small magnet 3 is connected to the side of the N extremely large magnet 2, and each of the two sides of the N extremely small magnet 2 is provided with an N extremely small magnet 3 and formed with an N pole magnetic group.

The S pole magnet includes the S extremely large magnet 4 and the S extremely small magnet 5, the radial section of the S extremely large magnet 4 is an isosceles trapezoid, and the top surface of the S extremely large magnet 4 is the third bonding surface , S extremely large magnetic steel 4 is pasted on the rotating shaft 1 through the third bonding surface, the central axis of S extremely large magnetic steel 4 is perpendicular to the axis of rotating shaft 1, and the radial section of S extremely small magnetic steel 5 is a rectangle. In the S extremely small magnetic steel 5, its magnetic force line is parallel to the radial tangential diagonal line of the S extremely small magnetic steel 5, the central axis of the S extremely small magnetic steel 5 is perpendicular to the axis of the rotating shaft 1, and the S extremely small magnetic steel 5 One side is the fourth bonding surface, and the S extremely small magnetic steel 5 is attached to the rotating shaft 1 through the fourth bonding surface, and the side surface of the S extremely small magnetic steel 5 is connected with the side surface of the S extremely large magnetic steel 4 To connect, the two sides of the S pole magnet 4 are each provided with an S pole magnet 5 and form an S pole magnetic group.

There are multiple N-pole magnetic groups and multiple S-pole magnetic groups. The N-pole magnetic groups and the S-pole magnetic groups are interspersed and surround the rotating shaft 1 to form a cylindrical rotor magnetic group. In the present invention, the limitation for the size of the magnetic steel group is as follows: according to the performance requirements of the motor, determine the size of the main magnetic circuit magnet (N, S extremely large magnetic steel) and the auxiliary magnetic circuit magnetic steel (N, S) in the Halbach magnetic steel group. S very small magnetic steel) logarithm and size.

In the present invention, the limitation on the shape of the magnetic steel group is as follows: the shape of the magnetic steel group and the magnetic steel shapes of each part are designed according to the performance requirements and dimensions of the motor.

In the present invention, the limitation on the assembly of the magnetic steel group is as follows: the magnetic steel in the magnetic steel group of the same magnetic pole is installed by using the rotor magnetic group assembly tool.

In the present invention, the general assembly of the Halbach motor is defined as follows: the magnetic steel group is surface-mounted (this structure is mostly used for surface-mounted rotors) on the rotating shaft to form the rotor, and then the motor is assembled.

Inside the motor, the rotor installation space formed by the coil windings is basically a cylindrical space structure. Therefore, the present invention is based on the above-mentioned structural design. Steel 4, S extremely small magnetic steel 5 are also provided with an additional layer on the side facing away from the rotating shaft 1, the outer surface of the additional layer is a smooth curved surface, the inner surface of the additional layer is the same as N extremely small magnetic steel 2, N extremely small magnetic steel 3 , S extremely large magnetic steel 4, and S extremely small magnetic steel 5 are connected; the outer surface of the rotor magnetic group is provided with an additional layer and forms a circular curved surface structure.

Through the limited number of structural designs by the designer, the additional layers are respectively set on the N maximum magnet 2, the N minimum magnet 3, the S maximum magnet 4, and the S minimum magnet 5, and the N maximum magnet 2 , N extremely small magnetic steel 3, S extremely large magnetic steel 4, and S extremely small magnetic steel 5 are assembled in turn, and the outer surface of the formed rotor magnetic group is a circular curved surface structure, so that the rotor magnetic group and the internal coil winding of the motor are formed. The air gaps between the formed rotor installation spaces are consistent.

In the present invention, the additional layer has various structural forms, which are not illustrated here one by one.

It is defined here that the additional layer is arranged on the N maximum magnet 2 , the N minimum magnet 3 , the S maximum magnet 4 , and the S minimum magnet 5 to form an integrated structure.

In the present invention, the bonding method and tooling positioning of the N pole magnetic group and the S pole magnetic group are the same, which can ensure that the external dimensions of all the magnetic pole groups are consistent, facilitate installation, improve the uniformity of the permanent magnet of the rotor, and reduce the air gap magnetic field of the motor Harmonics, reducing the torque ripple of the whole machine.

The installation process of the present invention is as follows: two inverted N extremely small magnets 3 and one N extremely large magnet 2 are bonded with glue; two inverted S extremely small magnets 5 and one S extremely large magnet 4 are glued together Glue bonding, and then surface-attach on the outer surface of the rotating shaft 1 in order.

It should be noted that in the present invention, each component is assembled according to the above process, and attention should be paid to its installation position during assembly to reduce assembly errors.

It should be noted that: in the present invention, the "big" and "small" magnets used refer to the size of the circumference of the permanent magnet. The circumference of the large magnet is greater than the circumference of the small magnet, and its ratio is within one In the magnetic group, it is generally 60% to 90% (determined according to the specific design); the "small" magnet refers to the permanent magnet that changes the magnetic circuit, and appears in pairs on both sides of the "big" magnet. According to the design requirements, the "small" magnet The logarithm of steel can be appropriately increased, and the total proportion in a magnetic group is generally not more than 40%.

The present invention also provides a manufacturing method for manufacturing the rotor structure of the above-mentioned Halbach motor, in the manufacturing method, it includes:

Step 1. Prepare N maximum magnet steel 2 and S maximum magnet steel 4 whose radial section is similar to an isosceles trapezoid (the bottom edge is an arc) by cutting;

Step 2, preparing the N extremely small magnetic steel 3 and the S extremely small magnetic steel 5 whose radial section is rectangular by cutting;

Step 3: Magnetize the N-maximum magnet 2 and form a magnetic force line perpendicular to its top or bottom surface in the N-maximum magnet 2, magnetize the S-maximum magnet 4 and place it in the S-maximum magnet. Magnetic force lines perpendicular to its top or bottom surface are formed in the steel 4, magnetizing the N extremely small magnetic steel 3 and forming a diagonal line parallel to its radial tangent or radial to the N extremely small magnetic steel 3. The tangent diagonal has a magnetic force line with an acute angle, magnetize the S extremely small magnetic steel 5 and form a parallel to its radial tangent diagonal or face its radial tangent in the S extremely small magnetic steel 5 Angular lines have magnetic field lines with acute angles;

Step 4: Set N extremely small magnetic steel 3 on both side surfaces of N extremely large magnet 2 and seamlessly attach to the side surfaces of N extremely large magnet 2 to form an N pole magnetic group. The magnetic lines of force in the N pole magnetic group, the N extremely small magnet 3 and the N extremely large magnet 2 form an acute angle structure, and the S extremely small magnet 5 is divided into the two side surfaces of the S extremely large magnet 4 And with the side surface of the S extremely large magnetic steel 4 seamlessly fit and form an S pole magnetic group, in the same S pole magnetic group, the magnetic field lines in the S extremely small magnetic steel 5 are the same as those in the S extremely small magnetic steel 4 The lines of magnetic force form an acute angle structure;

Step 5: Install the rotating shaft 1 and arrange the N-pole magnetic group and the S-pole magnetic group on the outer surface of the rotating shaft 1 , wherein the N-pole magnetic group and the S-pole magnetic group are interspersed.

In the above steps 3 and 4, the magnetization direction of the small magnets can be changed according to the overall structure of the motor. In one embodiment of the present invention, a pair of small magnets is arranged in a magnetic group, and the magnetization direction inside the small magnets In another embodiment of the present invention, when more than two pairs of small magnetic steels are arranged in one magnetic group, it needs to be magnetized according to the specific size of the motor.

In Step 4, the present invention also uses a magnetic group assembly tool, wherein the magnetic group assembly tool has a limiting groove with an isosceles trapezoidal cross section.

In Step 5, the present invention also uses a rotor magnetic group assembly tool, wherein the rotor magnetic group assembly tool has a limiting hole, and the cross-sectional shape of the limiting hole is a regular polygon or a circle.

The invention cuts the permanent magnet into a designed shape and magnetizes it according to a fixed direction; uses the permanent magnet forming tool to bond and form the permanent magnets constituting the N-pole magnetic group and the S-pole magnetic group; The pole magnetic group is spliced and installed on the rotating shaft 1, fixed with the rotor magnetic group assembly tool, and then bonded and cured.

Please refer to FIG. 6 and FIG. 7 , wherein FIG. 6 is a schematic structural diagram of the rotor magnetic assembly assembly tool in an embodiment of the present invention; FIG. 7 is a cross-sectional view along B-B in FIG. 6 .

The rotor magnetic group assembly tooling provided by the present invention includes a base 6, a limiting groove is arranged on the base 6, and an upper cover 8 is arranged on the upper side of the base 6 through tightening bolts 7; the width of the base 6 and the width of the upper cover 8 are in line with the The width of N pole magnet or S pole magnet is the same.

In the present invention, the main function of the rotor magnetic group assembly tool is to install the Halbach magnetic steel group (comprising the N pole group and the S pole group) of the above step 4, and the size of each Halbach magnetic steel group is limited by the tooling, thereby improving the rotor. The consistency of the magnetic steel installation structure. Since the structural precision of the rotor magnetic group is improved, the air gap waveform of the motor can be made smoother. The tooling consists of two parts (the base and the upper cover), that is, the tooling composed of magnetic steel. The function of the rotor magnetic group assembly tool is to fix the Halbach magnetic steel group, limit the relative position between the magnetic steels and limit the magnetic steel assembly.

The rotor magnetic group assembly tool is flat and long metal with a through hole in the middle (formed by setting the upper cover on the base and closing the limit groove by the upper cover). When using, install the magnetic steel with the same magnetic pole in the through hole of the tooling according to the above step 4. Before installation, apply glue (anaerobic glue) on the contact surface between the magnetic steel and the magnetic steel, and ensure that the surface of the magnetic steel must be flush; After the glue is solidified, press out the Halbach magnetic steel group bonded inside with the magnetic steel group pressing tool, remove the remaining glue inside the tooling, and complete the installation of a Halbach magnetic steel group.

After the present invention carries out above-mentioned structural innovation, its advantage is as follows:

1. The permanent magnets that make up the N-pole magnetic group and the S-pole magnetic group have a simple structure and shape, and their processing difficulty is low. It is suitable for most surface-mounted permanent magnets, such as ferrite, alnico, and rare earth materials. Wide range of applications;

2. The installation and operation of the permanent magnets constituting the N-pole magnetic group and the S-pole magnetic group are simple and convenient during assembly. Due to the complicated installation of permanent magnets in the prior art, it is an important constraint factor that the Halbach structure is not suitable for mass production. Therefore, through this The invented structural design can realize mass production of Halbach motors, and Halbach motors have high production efficiency and good product consistency;

3. The structure error of the N-pole magnetic group and the S-pole magnetic group is small, so the cumulative error in the circumferential direction generated when they are assembled on the rotating shaft 1 is also small. In the N-pole magnetic group or the S-pole magnetic group, its bottom surface (the surface used to connect with the rotating shaft 1) is composed of three angled planes, so that the N-pole magnetic group or the S-pole magnetic group is composed of three planes. The assembly of the group is limited by the structure. As long as the accuracy of the outer circle of the rotor is controlled, the centerline of each N-pole magnetic group or S-pole magnetic group can be guaranteed to coincide with the centerline of the connecting surface of the shaft 1. This independent positioning structure, There is almost no cumulative error in actual production. Also because of this, the present invention can eliminate cumulative errors, greatly optimize the air-gap magnetic density waveform of the Halbach structure motor, and improve the performance of the motor;

4. Compared with the motor with ordinary structure, the Halbach motor provided by the present invention can achieve larger permanent magnet cross-sectional area and longer internal magnetic circuit of the permanent magnet, thereby improving the external characteristics of the motor and having strong anti-demagnetization ability.

5. The present invention weakens the influence of permanent magnet installation accuracy through the pre-installed Halbach magnetic steel group; at the same time, the shape and distribution of special permanent magnets are used to reduce the influence of permanent magnet processing and magnetization accuracy, which can ensure the Halbach rotor structure Under the premise of performance advantages, the processing of batch products can be realized.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (6)

1. a rotor structure of a Halbach motor, comprising N pole magnets, S pole magnets and rotating shaft (1), is characterized in that, The rotating shaft is a circular shaft structure; The N-pole magnets include N-maximum magnets (2) and N-maximum magnets (3), the radial section of the N-maximum magnets is an isosceles trapezoid, and the N-maximum magnets have The top surface is the first fitting surface, and the N pole magnetic steel is pasted on the rotating shaft through the first fitting surface, and the radial section of the N pole small magnet steel is rectangular, and the N pole magnet is In the small magnetic steel, its magnetic force line is parallel to the radial tangent diagonal line of the N extremely small magnetic steel or has an acute angle included angle, one side of the N extremely small magnetic steel is the second bonding surface, and the N extremely small magnetic steel The extremely small magnetic steel is pasted on the rotating shaft through the second bonding surface, and one side surface of the N extremely small magnet is connected to the side surface of the N extremely large magnet, and the N extremely small magnet is connected to the side surface of the N extremely large magnet. The two sides of the magnetic steel are each provided with the same number of one or more small N-pole magnets and an N-pole magnetic group is formed; The S pole magnet includes a very large S magnet (4) and a very small S magnet (5), the radial section of the S very large magnet is an isosceles trapezoid, and the S very large magnet The top surface is the third bonding surface, and the S extremely large magnet is pasted on the rotating shaft through the third bonding surface, and the radial section of the S extremely small magnet is rectangular. In the small magnetic steel, its magnetic force line is parallel to the radial tangent diagonal line of the S extremely small magnetic steel or has an acute angle, and one side of the S extremely small magnetic steel is the fourth bonding surface, and the S extremely small magnetic steel The extremely small magnet is pasted on the rotating shaft through the fourth bonding surface, one side of the S extremely small magnet is connected to the side of the S extremely large magnet, and the S extremely small The two sides of the magnetic steel are each provided with the same number of one or more S pole small magnets and formed with an S pole magnetic group; There are multiple N-pole magnetic groups, and there are multiple S-pole magnetic groups. The N-pole magnetic groups are interspersed with the S-pole magnetic groups and surround the rotating shaft to form a cylindrical rotor magnetic group. . 2. the rotor structure of Halbach motor according to claim 1, is characterized in that, An additional layer is provided on the side of the N maximum magnet, the N minimum magnet, the S maximum magnet, and the S minimum magnet on the side facing away from the rotating shaft, and the additional layer The outer surface of the outer surface is a smooth curved surface, and the inner surface of the additional layer is connected with the N extremely large magnet, the N extremely small magnet, the S extremely large magnet, and the S extremely small magnet; The outer surface of the rotor magnetic group is provided with the additional layer and forms a circular curved surface structure. 3. the rotor structure of Halbach motor according to claim 2, is characterized in that, The additional layer is arranged on the N maximum magnet, the N minimum magnet, the S maximum magnet, and the S minimum magnet to form an integrated structure. 4. a manufacturing method of the rotor structure of Halbach motor, is characterized in that, comprises: Step 1, preparing N maximum magnets and S maximum magnets whose radial section is isosceles trapezoidal by cutting; Step 2, preparing N extremely small magnets and S extremely small magnets with rectangular radial sections by cutting; Step 3: Magnetize the N-maximum magnet and form a magnetic force line perpendicular to its top or bottom surface in the N-maximum magnet, magnetize the S-maximum magnet and A magnetic force line perpendicular to its top or bottom surface is formed in the S extremely large magnet, and the N extremely small magnet is magnetized and a tangential plane parallel to its radial direction is formed in the N extremely small magnet. Angular line or a magnetic field line with an acute angle with its radial tangent diagonal, magnetize the S extremely small magnetic steel and form an angle parallel to its radial tangent in the S extremely small magnetic steel Lines or lines of magnetic force that have an acute angle with their radial tangential lines; Step 4. Separate the N-pole small magnets to the two side surfaces of the N-max magnets and seamlessly fit the side surfaces of the N-max magnets to form an N-pole magnetic group. In the same N pole magnetic group, the magnetic force lines in the N extremely small magnet and the magnetic force lines in the N extremely large magnet form an acute angle structure, and the S extremely small magnet is divided into the S pole The two side surfaces of the large magnet steel are seamlessly attached to the side surfaces of the S pole magnet and form an S pole magnetic group. In the same S pole magnetic group, the S pole small magnet The magnetic force lines in the steel form an acute angle structure with the magnetic force lines in the S maximum magnetic steel; Step 5, setting a rotating shaft and setting the N-pole magnetic group and the S-pole magnetic group on the outer surface of the rotating shaft, wherein the N-pole magnetic group and the S-pole magnetic group are interspersed. 5. the manufacture method of the rotor structure of Halbach motor according to claim 4, is characterized in that, It also includes a rotor magnetic group assembly tool, and the magnetic group assembly tool has a limit slot with an isosceles trapezoidal cross section. 6. the manufacture method of the rotor structure of Halbach motor according to claim 5, is characterized in that, The rotor magnetic group assembly tool includes a base (6), the limiting groove is provided on the base, and the upper cover (8) is provided on the upper side of the base through tightening bolts (7); The width of the base and the width of the upper cover are the same as the width of the N maximum magnet or the S maximum magnet.