Halbach array magnetic pole rotor and installation method thereof
By creating auxiliary magnet grooves on the rotor yoke of the Heilbeck array motor and optimizing the magnet arrangement, the assembly difficulties caused by the large number of magnets were solved, the magnet utilization rate was improved, the eddy current loss was reduced, and the air gap magnetic field was enhanced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SUZHOU LEGO MOTORS CO LTD
- Filing Date
- 2026-01-29
- Publication Date
- 2026-05-01
AI Technical Summary
The existing Haierbeck array motor rotor has difficulties in assembly and positioning due to the large number and small size of magnets, and the leakage of magnetic flux leads to increased eddy current losses, resulting in the failure to maximize the utilization of magnets.
Auxiliary magnet grooves are made on the rotor yoke, and auxiliary magnets are embedded in the grooves. The main magnets are arranged between two adjacent auxiliary magnets. The auxiliary magnets are used for positioning. The main magnets are magnetized radially outward, while the auxiliary magnets are magnetized tangentially and in the opposite direction. The magnet arrangement is optimized to enhance the air gap magnetic field and weaken the yoke magnetic field.
It effectively solved the assembly and positioning problem, reduced the process difficulty and manufacturing cost, and improved the utilization rate of magnets, reduced eddy current losses, and enhanced the air gap magnetic field.
Smart Images
Figure CN121966080A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of motor technology, and in particular to a Heilbeck array magnetic pole rotor and its installation method. Background Technology
[0002] Halbach pole arrangement can enhance the magnetic field on one side and weaken it on the other. When applied to motor rotors, proper arrangement can significantly reduce the thickness of the rotor yoke, even allowing the use of non-magnetic materials for the rotor yoke. The Halbach pole array on the rotor enhances the magnetic field on the air gap side and weakens it on the rotor yoke side (here, the rotor yoke side is considered a leakage magnetic field), achieving unilateral magnetization. However, conventional Halbach array structures still exhibit significant leakage magnetic field on the rotor yoke side, failing to maximize magnet utilization. Furthermore, the leakage magnetic field increases eddy current losses in the yoke.
[0003] In addition, the motor rotor with Halbach magnetic pole structure has a large number of main magnets and auxiliary magnets, which are pasted on the circumferential surface of the rotor core, making positioning difficult and assembly extremely challenging. Summary of the Invention
[0004] This invention provides a Heilbeck array magnetic pole rotor and its installation method. By opening auxiliary magnet grooves on the rotor yoke, the auxiliary magnets are embedded in the auxiliary magnet grooves, and the main magnets are arranged between two adjacent auxiliary magnets, the assembly and positioning problem caused by the large number and small size of the Heilbeck array motor rotor is solved.
[0005] In a first aspect, embodiments of the present invention provide a Heilbeck array magnetic pole rotor, including a rotor yoke and main magnets and auxiliary magnets periodically arranged on the rotor yoke; The rotor yoke has an auxiliary magnet groove, and the auxiliary magnet is embedded in the auxiliary magnet groove; The main magnet is arranged between two adjacent auxiliary magnets; The ratio of the radial height of the auxiliary magnet to that of the main magnet along the rotor yoke is 1-1.5.
[0006] Optionally, the magnetization direction of the main magnet is radially outward along the rotor yoke.
[0007] Optionally, the magnetization direction of the auxiliary magnets is along the tangent of the rotor yoke, and the magnetization directions of adjacent auxiliary magnets are opposite.
[0008] Optionally, the ratio of the width of the main magnet to the width of the auxiliary magnet along the rotor yoke is 1-3.
[0009] Optionally, the height ratio of the auxiliary magnet to the main magnet is 1.15-1.225.
[0010] Optionally, the depth of the groove of the auxiliary magnet is equal to the difference in radial height between the auxiliary magnet and the main magnet.
[0011] Optionally, the depth of the auxiliary magnet groove is greater than 0.5 mm.
[0012] Optionally, the rotor yoke is made of a non-ferromagnetic material.
[0013] Optional, the non-ferromagnetic material is aluminum alloy.
[0014] In a second aspect, embodiments of the present invention also provide a method for installing a Hellbeck array magnetic pole rotor, for installing any of the Hellbeck array magnetic pole rotors in the first aspect; Installation methods include: The auxiliary magnet is installed in the auxiliary magnet groove on the rotor yoke; The main magnet is installed between adjacent auxiliary magnets.
[0015] This invention provides a Heilbeck array pole rotor and its installation method. The pole rotor includes a rotor yoke and main magnets and auxiliary magnets periodically arranged on the rotor yoke. An auxiliary magnet groove is formed on the rotor yoke, and the auxiliary magnets are embedded in the groove to solve the problem of difficult positioning of the auxiliary magnets during installation. The main magnets are arranged between two adjacent auxiliary magnets and are positioned using the auxiliary magnets. This invention effectively solves the assembly and positioning problem caused by the large number and small size of magnets in the Heilbeck array motor rotor by embedding auxiliary magnets in the rotor yoke, significantly reducing process difficulty and manufacturing cost while ensuring high performance. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of a Heilbeck array magnetic pole rotor provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of a rotor magnetic yoke provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a main magnet and an auxiliary magnet provided in an embodiment of the present invention; Figure 4 This is a schematic diagram illustrating the relationship between the growth ratio of the auxiliary magnet relative to the main magnet and the magnetic flux density of the rotor yoke, provided in an embodiment of the present invention. Figure 5 This is a magnetic density cloud diagram of the rotor yoke when the height ratio of the auxiliary magnet to the main magnet is 1.15, according to an embodiment of the present invention. Figure 6 This is a flowchart of a Hellbeck array pole rotor installation method provided in an embodiment of the present invention; Figure 7 yes Figure 6The diagram shows the structural flowchart corresponding to the Heilbeck array pole rotor installation method. Detailed Implementation
[0017] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.
[0018] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0019] Figure 1 This is a schematic diagram of a Heilbeck array pole rotor provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of a rotor magnetic yoke provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of a main magnet and an auxiliary magnet provided in an embodiment of the present invention. The arrows in the diagram indicate the magnetization direction of the magnets. (Reference) Figures 1-3 This invention provides a Heilbeck array magnetic pole rotor, including a rotor yoke 1, and main magnets 2 and auxiliary magnets 3 periodically arranged on the rotor yoke; the rotor yoke 1 has grooves for auxiliary magnets, and the auxiliary magnets 2 are embedded in the grooves; the main magnets 2 are arranged between two adjacent auxiliary magnets 3. The ratio of the radial height of the auxiliary magnets to that of the main magnets along the rotor yoke is 1-1.5.
[0020] Specifically, the rotor yoke 1 can be understood as a rotating component of the permanent magnet motor, providing mechanical support for the main magnet 2 and auxiliary magnet 3, and forming a low-resistivity magnetic field path. The main magnet 2 is a permanent magnet magnetized radially or parallel to the rotor, used to establish the main air gap magnetic field at the outer edge of the rotor. The magnetization direction of the auxiliary magnet 3 is different from that of the main magnet. It uses the Hellbeck array principle to modulate the magnetic field of the main magnet to enhance the magnetic field strength on the air gap side and weaken the magnetic flux in the rotor yoke. In the final Hellbeck array, after the magnetic fields of the auxiliary magnet 3 and the main magnet 2 are vector-superimposed, the magnetic field is significantly enhanced on the rotor outer edge side near the air gap, achieving a magnetic focusing effect, while on the rotor yoke side near the shaft, they weaken each other, achieving magnetic flux shunting.
[0021] It should be noted that the ratio of the radial height of the auxiliary magnet to that of the main magnet along the rotor yoke is 1-1.5, which is determined based on pre-experiments or theoretical calculations under specific motor conditions. In the Halebeck array structure, a lower rotor yoke magnetic flux density (weakening side) is desirable. When the ratio of the radial height of the auxiliary magnet to that of the main magnet is between 1 and 1.5, the yoke magnetic flux density can reach a smaller value or range. Compared to a design where the auxiliary magnet and the main magnet are of equal height, the yoke magnetic flux density can be reduced by approximately 37%.
[0022] This invention provides a Hellbeck array pole rotor, comprising a rotor yoke and main magnets and auxiliary magnets periodically arranged on the rotor yoke. The rotor yoke has grooves for the auxiliary magnets, and the auxiliary magnets are embedded within these grooves to solve the problem of difficult positioning of the auxiliary magnets during installation. The main magnets are arranged between two adjacent auxiliary magnets and are positioned using these auxiliary magnets. This invention, by creating grooves for the auxiliary magnets on the rotor yoke, embedding the auxiliary magnets within these grooves, and arranging the main magnets between two adjacent auxiliary magnets, solves the assembly and positioning problem caused by the large number and small size of magnets in the Hellbeck array motor rotor.
[0023] Optionally, the magnetization direction of the main magnet 2 is radially outward along the rotor yoke 1.
[0024] For details, please refer to [link / reference]. Figure 1 In the Heilbeck array, the magnetization direction of the main magnets 2 is set to be radially outward along the rotor yoke 1. Under the magnetic field modulation of two adjacent tangentially magnetized auxiliary magnets 3, the magnetic fields radiated outward by all the main magnets 2 are superimposed in the same direction in the air gap at the outer edge of the rotor, thereby enhancing the air gap magnetic flux density; at the same time, the magnetic field component pointing inward toward the rotating shaft cancels out the magnetic field of the auxiliary magnets in the rotor yoke region, reducing the magnetic flux density of the yoke.
[0025] Optionally, the magnetization direction of the auxiliary magnet 3 is along the tangent of the rotor yoke 1, and the magnetization directions of adjacent auxiliary magnets 3 are opposite.
[0026] For details, please refer to [link / reference]. Figure 1 In the Hellbeck array, the magnetization direction of the auxiliary magnet 3 is set to be tangential to the rotor yoke 1, and the magnetization directions of adjacent auxiliary magnets 3 are opposite to each other. The paired tangential magnetic fields with opposite directions are used to modulate the magnetic field of the main magnet 2: on its side near the air gap (outer edge of the rotor), the magnetic field of the auxiliary magnet is superimposed in the same direction with the magnetic field of the main magnet, which enhances the magnetic field of the air gap (magnetic focusing); on its side near the shaft (rotor yoke), the magnetic field of the auxiliary magnet is superimposed in opposite directions with the magnetic field of the main magnet, which weakens the magnetic field of the yoke (shielding).
[0027] Optionally, the ratio of the width of the main magnet to the width of the auxiliary magnet along the rotor yoke is 1-3.
[0028] For details, please refer to [link / reference]. Figure 3 The tangential widths of the main magnet 2 and the auxiliary magnet 3 along the rotor yoke 1 are W1 and W2, respectively, and the ratio of their tangential widths, W1 / W2, is set within the range of 1-3. If the ratio of their tangential widths along the rotor yoke 1 is relatively small (close to 1), the modulation effect of magnetization and shielding is better; if the ratio is relatively large (close to 3), sufficient magnetomotive force can be provided. Considering that conventional Hellbeck array structures still have significant leakage flux on the rotor yoke side, the magnet utilization rate is not maximized, and leakage flux also increases eddy current losses in the yoke. To obtain better modulation effect of magnetization and shielding, this application preferably describes an embodiment where the ratio of the tangential widths of the main magnet 2 and the auxiliary magnet 3 along the rotor yoke 1 is 1.
[0029] Figure 4 This is a schematic diagram illustrating the relationship between the growth ratio of the auxiliary magnet relative to the main magnet and the magnetic flux density of the rotor yoke, provided by an embodiment of the present invention. In an optional embodiment, refer to... Figure 3 and Figure 4 The height ratio b / a between the auxiliary magnet and the main magnet is 1.15-1.225.
[0030] Specifically, the ratio of the auxiliary magnet's height to the main magnet's height (ba) / a = X, the height ratio of the auxiliary magnet to the main magnet = X + 1, and the magnetic flux density at the rotor yoke is a key indicator of whether the magnetic circuit is approaching saturation. The lower the value, the lower the risk of magnetic saturation. When the height ratio is around 1.15 to 1.25, the magnetic flux density is in the low range of the chart. Therefore, 1.15-1.225 is a design range that can effectively reduce the risk of magnetic saturation and achieves optimal overall performance.
[0031] For example, Figure 5This is a magnetic density cloud diagram of the rotor yoke when the height ratio of the auxiliary magnet to the main magnet is 1.15, provided in an embodiment of the present invention. Figure 5 In the diagram, different colors represent different magnetic flux density levels, measured in Tesla. When the height ratio of the auxiliary magnet to the main magnet is 1.15, the overall magnetic flux density around the yoke is low and relatively uniform, with no areas appearing in deep red (representing extremely high magnetic flux density, close to saturation).
[0032] Optionally, the depth of the groove of the auxiliary magnet is equal to the difference in radial height between the auxiliary magnet and the main magnet.
[0033] Specifically, the auxiliary magnet is embedded in the groove, and the main magnet is attached to the surface of the yoke. The radial height difference between the two is compensated by the depth of the groove, ultimately ensuring that the outer sides are flush. This avoids the formation of uneven surfaces with varying heights on the outer sides of the magnets. Uneven surfaces can lead to problems such as local scattering of the magnetic field, loss of magnetic flux, and inability to form a continuous and concentrated strong magnetic field, directly weakening the advantage of the Hellbeck array's single-sided magnetic focusing.
[0034] Optionally, the depth of the auxiliary magnet groove is greater than 0.5 mm.
[0035] Specifically, considering that the magnets may need to be chamfered, the depth of the auxiliary magnet groove should be at least 0.5mm to ensure the fixing effect of the auxiliary magnet 3 and the rotor yoke 1.
[0036] Optionally, the rotor yoke is made of a non-ferromagnetic material.
[0037] Specifically, using non-ferromagnetic materials to manufacture the rotor yoke can increase the magnetic reluctance of the yoke and weaken the magnetic field of the yoke, thereby reducing the magnetic flux density of the yoke and avoiding saturation.
[0038] In an optional embodiment, the non-ferromagnetic material is an aluminum alloy.
[0039] Figure 6 This is a flowchart of a Hellbeck array pole rotor installation method provided in an embodiment of the present invention. Figure 7 yes Figure 6 The diagram shows the structural flowchart corresponding to the Hellbeck array magnetic pole rotor installation method. This embodiment of the invention also provides a Hellbeck array magnetic pole rotor installation method for installing any of the Hellbeck array magnetic pole rotors described in the first aspect.
[0040] refer to Figure 6 The installation method includes: S110. Install the auxiliary magnet in the auxiliary magnet groove on the rotor yoke.
[0041] For details, please refer to Figure 7A rotor yoke 1 is provided, and a plurality of auxiliary magnets 3 are installed and fixed in the respective auxiliary magnet grooves of the rotor yoke 1 according to their predetermined magnetization directions. The fixing methods include, but are not limited to, interference fits or adhesive bonding.
[0042] S120. Install the main magnet between adjacent auxiliary magnets.
[0043] Specifically, after the auxiliary magnets 3 have been installed and fixed in the auxiliary magnet grooves of the rotor yoke 1, each main magnet 2 is installed and fixed in the installation space defined between two adjacent auxiliary magnets 3 on the rotor yoke 1 according to its predetermined magnetization direction. The fixing methods for the main magnets include, but are not limited to, interference fits or adhesive bonding.
[0044] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.
Claims
1. A Heilbeck array pole rotor, characterized in that, It includes a rotor yoke, and main magnets and auxiliary magnets arranged periodically on the rotor yoke; The rotor yoke has an auxiliary magnet groove, and the auxiliary magnet is embedded in the auxiliary magnet groove; The main magnet is arranged between two adjacent auxiliary magnets; The ratio of the radial height of the auxiliary magnet to that of the main magnet along the rotor yoke is 1-1.
5.
2. The Heilbeck array pole rotor according to claim 1, characterized in that, The magnetization direction of the main magnet is radially outward along the rotor yoke.
3. The Heilbeck array pole rotor according to claim 1, characterized in that, The magnetization direction of the auxiliary magnet is along the tangent of the rotor yoke, and the magnetization directions of adjacent auxiliary magnets are opposite.
4. The Heilbeck array pole rotor according to claim 1, characterized in that, The ratio of the width of the main magnet to the width of the auxiliary magnet along the tangential direction of the rotor yoke is 1-3.
5. The Heilbeck array pole rotor according to claim 1, characterized in that, The height ratio of the auxiliary magnet to the main magnet is 1.15-1.
225.
6. The Heilbeck array pole rotor according to claim 1, characterized in that, The depth of the groove of the auxiliary magnet is equal to the difference in radial height between the auxiliary magnet and the main magnet.
7. The Heilbeck array pole rotor according to claim 1, characterized in that, The depth of the auxiliary magnet groove is greater than 0.5 mm.
8. The Heilbeck array pole rotor according to claim 1, characterized in that, The rotor yoke is made of a non-ferromagnetic material.
9. The Heilbeck array pole rotor according to claim 8, characterized in that, The non-ferromagnetic material is an aluminum alloy.
10. A method for installing a Hellbeck array magnetic pole rotor, characterized in that, For mounting the Hellbeck array magnetic pole rotor as described in any one of claims 1-9; The installation method includes: The auxiliary magnet is installed in the auxiliary magnet groove on the rotor yoke; The main magnet is installed between adjacent auxiliary magnets.