A pole module of a permanent magnet motor, a manufacturing method and a permanent magnet motor
By using mortise and tenon joints and the arrangement of Heilbeck magnets, the problem of unstable welding fixation in permanent magnet motors was solved, achieving reliable fixation of the pole box and improving motor performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
- Filing Date
- 2021-10-29
- Publication Date
- 2026-06-02
Smart Images
Figure CN116094218B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of motor technology, specifically to a magnetic pole module, processing method, and permanent magnet motor. Background Technology
[0002] A permanent magnet motor includes a rotor yoke and pole modules mounted on the rotor yoke. The pole module comprises a carrier plate fixed to the rotor yoke and pole boxes fixed to the carrier plate, with magnets housed within the pole boxes. Currently, to ensure installation reliability, pole boxes are typically fixed to the carrier plate by welding. However, welding generates high temperatures and harmful gases, and the high temperatures affect the magnets within the pole boxes, influencing their magnetization direction and magnetization. Welded fixation is unstable and prone to detachment as the rotor rotates. Therefore, improving the fixation effect of the magnets in both the axial and radial directions is a problem that urgently needs to be solved. Summary of the Invention
[0003] This invention provides a magnetic pole module for a permanent magnet motor, comprising a carrier plate fixed to the rotor yoke of the permanent magnet motor, and a magnetic pole box. The magnetic pole box has an opening on one side facing the carrier plate, and a Heilbeck magnet is installed inside the magnetic pole box. The magnetic pole box includes a panel opposite to the opening and a side plate surrounding the panel. The side plate includes a pair of oppositely arranged and parallel plug-in side plates, which are inserted into the corresponding sides of the carrier plate along their length direction to be tenon-and-mortise connected to the carrier plate. The side plate also includes a cover side plate, which can restrict the plug-in side plates from disengaging in the plug-in direction or in the opposite direction.
[0004] In one specific embodiment, at least a portion of the edge of the plug-in side plate is provided with an inwardly extending flange, the carrier plate is provided with a corresponding slot, at least one end of the slot is open, and the flange is inserted into the slot along the opening of the slot to achieve a tenon-and-mortise connection.
[0005] In one specific embodiment, at least a portion of the edge of the flange extends toward the panel to form a raised strip, and the groove wall of the slot is provided with a groove corresponding to the raised strip.
[0006] In one specific embodiment, the inner side of the plug-in side plate is provided with a slot, at least one end of the slot is open, and at least a portion of the edge of the carrier plate is provided with a protrusion, which is inserted into the slot along the opening of the slot to achieve a tenon-and-mortise connection.
[0007] In one specific embodiment, the magnetic pole box contains a plurality of magnets, which are magnetized to form the Heilbeck magnet; or the Heilbeck magnet is formed by magnetizing a single piece of magnet.
[0008] The present invention also provides a method for processing a magnetic pole module of a permanent magnet motor. Based on the magnetic pole module of the permanent magnet motor described in any of the above claims, a blank plate for preparing a magnetic pole box is prepared. The blank plate includes a main board located in the middle and a plurality of extension plates extending outward from multiple edges of the main board. The main board is used to form the panel of the magnetic pole box.
[0009] The pair of oppositely arranged and parallel extension plates are bent to form a pair of plug-in side plates;
[0010] Install the magnet;
[0011] The plug-in side plate is tenon-and ...
[0012] The other extension plates are bent to form the cover side plates to cover both ends of the magnetic pole box.
[0013] In one specific manner, the edges of a pair of parallel extension plates are bent inward to form a flange, and then the pair of extension plates are bent to form a pair of plug-in side plates; or, the pairs of parallel extension plates are bent to form the pair of plug-in side plates, and then the edges of the pair of plug-in side plates are bent to form the flange.
[0014] The present invention also provides a permanent magnet motor, including a rotor yoke, and further including a magnetic pole module of the permanent magnet motor as described in any of the preceding claims, wherein the carrier plate of the magnetic pole module is fixed to the rotor yoke.
[0015] In one specific embodiment, the rotor yoke is provided with a dovetail groove, and one side of the carrier plate has a dovetail-shaped structure, with the dovetail-shaped structure of the carrier plate inserted into the dovetail groove.
[0016] In one specific embodiment, at least one of the following is applied: glue or heat dissipation grease or a mixture of glue and heat dissipation grease between the magnet and the magnetic pole box, between the magnet and the carrier plate, and between the carrier plate and the rotor yoke.
[0017] In this design, the pole box and carrier plate are connected using mortise and tenon joints, replacing the traditional welding method. This allows for magnetization of the magnets inside the pole box, which is fixed to the carrier plate, without the high temperatures associated with welding. This makes it possible to form Heilbeck magnets within the pole box. Furthermore, the mortise and tenon joint does not damage the magnets or generate harmful gases. Additionally, the mortise and tenon joint between the pole box's insertion side plate and the carrier plate, along with the use of a sealing side plate for positioning, ensures a smooth and reliable connection. Therefore, the pole module in this design also boasts advantages such as simple structure and ease of mass production. The Heilbeck magnet arrangement method significantly improves the sinusoidal nature of the air gap magnetic field, which is beneficial for enhancing motor performance. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the magnetic pole module being installed on the rotor yoke in an embodiment of the present invention;
[0019] Figure 2 For use in forming Figure 1 Schematic diagram of the blank plate for the middle magnetic pole box;
[0020] Figure 3 for Figure 2 A schematic diagram of a pair of extended edges of a medium billet flat after bending.
[0021] Figure 4 for Figure 3 A schematic diagram showing the magnetic pole box being fitted with magnets and then connected to the carrier plate via tenon and mortise joints.
[0022] Figure 5 for Figure 4 A schematic diagram showing the mortise and tenon connection between the middle magnetic pole box and the carrier plate;
[0023] Figure 6 This is a schematic diagram of the magnet inside the magnetic pole box after it has been magnetized.
[0024] Figure 1-6 The annotations in the attached figures are explained as follows:
[0025] 1-Rotor yoke;
[0026] 2-Magnetic steel;
[0027] 3-Magnetic pole box; 311-First cover side plate; 313-First plug-in side plate; 314-Second plug-in side plate; 31a-Flanged edge; 31b-Raised strip; 32-Panel;
[0028] 311' - First extension plate; 312' - Second extension plate; 313' - Third extension plate; 314' - Fourth extension plate;
[0029] 4-Carrier plate; 41-Dovetail structure; 41a-Slot; 41b-Groove. Detailed Implementation
[0030] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0031] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the magnetic pole module installed on the rotor yoke 1 in an embodiment of the present invention. It shows two magnetic pole modules, including a cross-sectional view of one magnetic pole module, the corresponding carrier plate 4, and the rotor yoke 1.
[0032] The permanent magnet motor in this embodiment includes a rotor yoke 1 and a magnetic pole module mounted on the rotor yoke 1. The permanent magnet motor can be a low-speed, large-diameter permanent magnet motor. The magnetic pole module includes a carrier plate 4 fixed to the rotor yoke 1 and a magnetic pole box 3 fixed to the carrier plate 4. The magnetic pole box 3 can be made of materials such as stainless steel or silicon steel sheets. Figure 1 In the rotor yoke 1, a dovetail groove is provided on the side facing the carrier plate 4, and a dovetail structure 41 is formed on the side of the carrier plate 4 facing the rotor yoke 1. The dovetail structure 41 is inserted into the dovetail groove along its length direction. Figure 1 If the carrier plate 4 is inserted into the dovetail groove in a direction perpendicular to the paper, then the carrier plate 4 cannot detach radially from the rotor yoke 1. Of course, this is only one specific way of fixing the carrier plate 4 and the rotor yoke 1, and this solution does not impose any specific restrictions.
[0033] The magnetic pole box 3 of the magnetic pole module contains multiple magnets 2. One side of the magnetic pole box 3 is open, facing the carrier plate 4. The carrier plate 4 serves as a carrier component for mounting the magnetic pole box 3 to the rotor yoke 1. Figure 1 As shown, after the magnetic pole box 3 is fixed to the carrier plate 4, the magnet 2 inside the magnetic pole box 3 can contact the carrier plate 4 from the opening position.
[0034] It is worth noting that in this embodiment, the magnetic pole box 3 of the magnetic pole module is tenon-and ...
[0035] For details on how mortise and tenon joints are implemented, please refer to [reference needed]. Figure 2-4 understand, Figure 2 For use in forming Figure 1 Schematic diagram of the blank plate of the middle magnetic pole box 3; Figure 3 for Figure 2 A schematic diagram of a pair of extended edges of a medium billet flat after bending. Figure 4 for Figure 3 A schematic diagram showing the middle magnetic pole box 3 being connected to the carrier plate 4 after the magnet 2 is inserted into it using a tenon and mortise joint. Figure 5 for Figure 4 A schematic diagram showing the mortise and tenon connection between the middle magnetic pole box 3 and the carrier plate 4.
[0036] In this embodiment, the magnetic pole box 3 includes a panel 32 opposite to the opening and a side plate surrounding the panel 32. The side plate includes a pair of side plates, which are arranged opposite to each other and parallel to each other. One of the side plates is defined as a plug-in side plate. Figure 2 The central magnetic pole box 3 is a square box structure with an opening on one side, and also includes another pair of side plates, one of which can be defined as a cover side plate. The insert side plates are inserted along their length into the corresponding sides of the carrier plate 4 to achieve a mortise and tenon connection. To avoid interference from other side plates during the insertion of the mortise and tenon connection, the specific installation method is as follows:
[0037] like Figure 2 As shown, a blank plate for the magnetic pole box 3 can be prepared first. The blank plate includes a square main plate located in the center, and four extension plates extending outward from the four sides of the main plate. The square main plate is used to form Figure 1 The magnetic pole box 3 shown has a panel 32. In this design, the blank plate is a single piece of plate, which can be cut, stamped, or otherwise formed into four extension plates extending from the central square main plate: a first extension plate 311', a second extension plate 312', a third extension plate 313', and a fourth extension plate 314'. The four extension plates and the central panel 32 are essentially a single integrated structure. Figure 2 The dotted line in the middle indicates the boundary between the extension plate and the panel 32.
[0038] The third extension plate 313' and the fourth extension plate 314' are a pair of extension plates arranged opposite each other, and the first extension plate 311' and the second extension plate 312' are another pair of extension plates arranged opposite each other. One pair of extension plates can be bent to form a pair of interlocking side plates, such as... Figure 3 As shown, bending the third extension plate 313' and the fourth extension plate 314' will form the first insertion side plate and the second insertion side plate of the magnetic pole box 3.
[0039] After bending to form a pair of plug-in side plates, magnet 2 can be installed. At this time, a certain space is formed between the bent pair of plug-in side plates and the panel 32, but both ends are open (the first extension plate 311' and the second extension plate 312' are still flush with the panel 32), and magnet 2 can be placed in the corresponding position of the panel 32.
[0040] Then, the magnetic pole box 3, which contains the magnet 2 and has open ends, and the carrier plate 4 are connected by tenon and mortise joints, such as... Figure 4 As shown, the carrier plate 4 has at least one open slot 41a on each side corresponding to the first and second insertion side plates. The edges of the first and second insertion side plates 313 and 314 each have inwardly extending flanges 31a. Along the length of the slot 41a, the flanges 31a are inserted into the slot 41a from their ends, forming a mortise and tenon connection. It should be noted that the inward extension of the flanges 31a refers to the direction closer to the magnetic pole box 3. The flanges 31a are approximately parallel to the panel 32. The flanges 31a of the first insertion side plate extend towards the second insertion side plate, and the flanges 31a of the second insertion side plate extend towards the first insertion side plate. Furthermore, the edges of the first and second insertion side plates 313 and 314 may be partially or entirely provided with flanges 31a.
[0041] like Figure 5 As shown, after the flanges 31a of a pair of plug-in side plates and the slots 41a of the carrier plate 4 are fully plugged in, in the radial direction of the rotor yoke 1 (combined with...) Figure 1(Understood) The magnetic pole box 3 cannot detach from the carrier plate 4. Of course, since the pair of plug-in side plates are arranged opposite each other, they will interfere with each other, and the magnetic pole box 3 cannot detach along the slot of the card slot 41a. Figure 1 The slot opening of the middle card slot 41a is located on both sides of the carrier plate 4, and the slot opening faces outward. The length direction of the slot opening is parallel to the axial direction of the rotor yoke 1.
[0042] At this point, another pair of extension plates can be bent, namely, the first extension plate 311' and the second extension plate 312', to form another pair of sealing side plates, namely the first sealing side plate 311 and the second sealing side plate. The first sealing side plate 311 and the second sealing side plate can seal both ends of the magnetic pole box 3. Figure 1 The magnetic pole box 3 on the right side shows the first sealing side plate 311. It should be understood that the first insertion side plate 313 and the second insertion side plate 314 are arranged in parallel and need to be inserted into the slot 41a of the carrier plate 4. The first sealing side plate 311 and the second sealing side plate only need to cover both ends of the magnetic pole box 3. They can also be arranged in a non-parallel manner, or designed according to the end shape of the carrier plate 4, or one end can be not limited to one sealing side plate. This embodiment does not impose specific restrictions.
[0043] It should be noted that since the first and second sealing side plates 311 and 311 cover both ends of the magnetic pole box 3, they also cover the positions where they are tenon-and-mortise connected to the carrier plate 4. This prevents the insertion side plates (first and second insertion side plates) from detaching from the carrier plate 4 in the insertion direction or in the opposite direction. Figure 1 As shown in the left-hand magnetic pole box 3, the magnetic pole box 3 is inserted into the carrier plate 4 in a direction perpendicular to the paper plane, as follows. Figure 1 As shown in the magnetic pole box 3 on the right, after the first cover side plate 311 and the second cover side plate are formed, the magnetic pole box 3 cannot detach from the carrier plate 4 in the insertion direction or in the opposite direction to the insertion direction due to the obstruction of the first cover side plate 311 and the second cover side plate.
[0044] Please continue reading. Figure 3 , 4The entire edge of the flange 31a of the insert side plate extends towards the panel 32 to form a protrusion 31b. The protrusion 31b can be formed by bending the flange 31a towards the panel 32, or the flange 31a can be thicker at the edge. The groove wall of the slot 41a has a groove 41b corresponding to the protrusion 31b, that is, the cross-section of the slot 41a is L-shaped. With this configuration, when the flange 31a of the insert side plate is inserted into the corresponding slot 41a, the protrusion 31b of the flange 31a is correspondingly inserted into the groove 41b. In this way, not only is a limit formed in the direction perpendicular to the flange 31a, but the side wall of the groove 41b also forms a limit for the protrusion 31b in the direction parallel to the flange 31a, thereby confining the flange 31a within the slot 41a and preventing the flange 31a from accidentally detaching along the groove opening direction of the slot 41a. It can be seen that the edge of the flange 31a may also be partially provided with the above-mentioned protrusion 31b along the length direction.
[0045] like Figure 6 As shown, Figure 6 This is a schematic diagram of the magnet 2 inside the magnetic pole box 3 after it has been magnetized.
[0046] After bending the first sealing side plate 311 and the second sealing side plate to seal the end of the magnetic pole box 3, the magnetic pole box 3 is reliably fixed to the carrier plate 4. At this time, the magnet 2 inside the magnetic pole box 3 can be magnetized, and after magnetization, it forms... Figure 6 The Helbeck magnet shown has different magnetization directions at different locations. Figure 6 In the left-hand magnetic pole box 3, the magnetization directions of the three magnets 2 are diagonally upward to the left, upward, and diagonally upward to the right, respectively. In the right-hand magnetic pole box 3, the magnetization directions of the three magnets 2 are diagonally downward to the right, downward, and diagonally downward to the left, respectively. The magnets 2 in the left-hand and right-hand magnetic pole boxes 3 form magnetic poles with different polarities, namely N poles and S poles, with the magnetization directions of the N poles and S poles being exactly opposite. Heilbeck magnets can establish a sinusoidal magnetic field between the stator and rotor air gaps of a permanent magnet motor, significantly improving the sinusoidal nature of the air gap magnetic field and thus enhancing motor performance. The structural principle of Heilbeck magnets can be understood by referring to existing technologies and will not be elaborated here.
[0047] In this embodiment, the Heilbeck magnet in the magnetic pole box 3 is assembled from three magnets 2. It can also be a larger number of magnets 2, or a whole magnet 2 can be used and the magnet is sinusoidally magnetized as a whole. That is, different magnetization directions at different positions of the whole magnet also belong to the Heilbeck magnet described in this solution.
[0048] It is important to emphasize that in this embodiment, the pole box 3 and the carrier plate 4 are connected by mortise and tenon joints, instead of the traditional welding connection. This allows for the magnetization of the magnet 2 inside the pole box 3, which is fixed to the carrier plate 4, without the magnet 2 being affected by the high temperatures of welding. Although Heilbeck magnets are a known technology, the welding method used to fix the pole box prevented their actual application within the pole box 3, as Heilbeck magnets have stricter requirements for magnetization direction and the magnetization environment. The mortise and tenon joint method in this solution makes it possible to form Heilbeck magnets within the pole box 3. The arrangement of Heilbeck magnets can significantly improve the sinusoidal nature of the air gap magnetic field, which is beneficial for improving motor performance. Furthermore, the mortise and tenon joint does not damage the magnets and does not produce harmful gases.
[0049] Furthermore, the plug-in side plate of the magnetic pole box 3 and the carrier plate 4 are connected by mortise and tenon joints, and the sealing side plate is used for limiting the movement. This ensures that the mortise and tenon connection is smooth and the limiting is very reliable. The entire magnetic pole box 3 and carrier plate 4 are very firmly fixed, and only destructive operations can release this fixation. The reliability of the fixation can reach or even exceed that of welding methods, and the operation of this mortise and tenon connection is very simple. It can be seen that the magnetic pole module in this solution also has the advantages of simple and reliable structure, as well as being easy to mass-produce.
[0050] In the above embodiments, the insertion side plate is inserted into both sides of the carrier plate 4 by setting a flange 31a. It can be understood that the inner side of the insertion side plate may have ribs, for example, which can be inserted into the slot 41a. The structure is not limited to forming a flange 31a to cooperate with the slot 41a. Furthermore, the carrier plate 4 has a slot 41a, which can be open at one end and closed at the other. This ensures that even without the cover of the magnetic pole box 3, the magnetic pole box 3 will not detach along the slot 41a. Of course, both ends can also be open, even under the cover of the cover side plate, and the open ends facilitate the processing of the slot 41a. The slot 41a can also be equipped with a magnet, which can be attracted and fixed after the flange 31a is inserted, further improving the fixing effect.
[0051] In addition, in this embodiment, the pair of plug-in side plates in the magnetic pole box 3 are provided with flanges 31a and slots 41a of the carrier plate 4 for insertion and matting to achieve a tenon-and-mortise connection. It can be seen that slots 41a are provided on the inner side of the pair of plug-in side plates, and protruding parts are provided on both sides of the carrier plate 4. The protruding parts can be inserted into the slots 41a along the opening at the end of the slots 41a to achieve a tenon-and-mortise connection. For example Figure 2 As shown, the insertion side plate of the magnetic pole box 3 is thinner than the carrier plate 4. The slot 41a on the carrier plate 4 makes the tenon and mortise connection more reliable. At this time, after the insertion forms a tenon and mortise connection, the first cover side plate 311 and the second cover side plate can still be bent to form a cover, so as to restrict the magnetic pole box 3 from detaching from the carrier plate 4 in the insertion direction or in the opposite direction to the insertion direction.
[0052] In this embodiment, adhesive, thermal grease, or a mixture of both can be applied between the magnet 2 and the pole box 3, between the magnet 2 and the carrier plate 4, and between the carrier plate 4 and the rotor yoke 1 to enhance the fixation of the magnet 2 and increase the rotor's heat dissipation capacity. Furthermore, the magnet 2 is encapsulated within the pole box 3, improving its protection level and making it less susceptible to corrosion and breakage. Even if it breaks, the residue will be sealed within the pole box 3, and the residue will not affect the operation of the permanent magnet motor.
[0053] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.
Claims
1. A magnetic pole module for a permanent magnet motor, characterized in that, The device includes a carrier plate (4) fixed to the rotor yoke (1) of a permanent magnet motor, and a pole box (3). The pole box (3) has an opening on one side facing the carrier plate (4). The pole box (3) contains Heilbeck magnets. The pole box (3) includes a panel (32) opposite to the opening and a side plate surrounding the panel (32). The side plate includes a pair of opposite and parallel plug-in side plates. The plug-in side plates are inserted into the corresponding sides of the carrier plate (4) along their length direction to be tenon-mortise connected to the carrier plate (4). The side plate also includes a cover side plate that can restrict the plug-in side plates from disengaging in the plug-in direction or in the opposite direction. The pole box includes a panel located in the middle and multiple extension plates extending outward from multiple edges of the panel. A pair of opposite and parallel extension plates are bent to form a pair of plug-in side plates, and the other extension plates are bent to form the cover side plates.
2. The magnetic pole module of the permanent magnet motor as described in claim 1, characterized in that, At least a portion of the edge of the plug-in side plate is provided with an inwardly extending flange (31a), and the carrier plate (4) is provided with a corresponding slot (4a). At least one end of the slot (4a) is open, and the flange (31a) is inserted into the slot (4a) along the opening of the slot (4a) to achieve a tenon-and-mortise connection.
3. The magnetic pole module of the permanent magnet motor as described in claim 2, characterized in that, At least a portion of the edge of the flange (31a) extends toward the panel to form a ridge (31b), and the groove wall of the slot (4a) is provided with a groove (4b) corresponding to the ridge (31b).
4. The magnetic pole module of the permanent magnet motor as described in claim 1, characterized in that, The inner side of the plug-in side plate is provided with a slot, at least one end of the slot is open, and at least part of the edge of the carrier plate (4) is provided with a protrusion. The protrusion is inserted into the slot along the opening of the slot to achieve a tenon-and-mortise connection.
5. The magnetic pole module of the permanent magnet motor as described in any one of claims 1-4, characterized in that, The magnetic pole box (3) contains a plurality of magnets (2), and the plurality of magnets (2) are magnetized to form the Halbec magnet; or the Halbec magnet is formed by magnetizing a whole piece of magnet.
6. A method for processing a magnetic pole module of a permanent magnet motor, based on the magnetic pole module of a permanent magnet motor according to any one of claims 1-5, characterized in that, A blank plate for preparing the magnetic pole box (3) includes a main plate located in the middle and multiple extension plates extending outward from multiple edges of the main plate; the main plate is used to form the panel (32) of the magnetic pole box (3). The pair of oppositely arranged and parallel extension plates are bent to form a pair of plug-in side plates; Install the magnet (2); The plug-in side plate is tenon-and ... The other extension plates are bent to form the cover side plates to cover both ends of the magnetic pole box (3).
7. The method for processing the magnetic pole module of the permanent magnet motor as described in claim 6, characterized in that, The edges of a pair of oppositely arranged and parallel extension plates are bent inward to form a flange (31a), and then the pair of extension plates are bent to form a pair of plug-in side plates; or, the edges of the pair of plug-in side plates are bent to form the pair of plug-in side plates, and then the flange (31a) is bent.
8. A permanent magnet motor, characterized in that, It includes a rotor yoke (1) and a magnetic pole module of a permanent magnet motor as described in any one of claims 1-5, wherein the carrier plate (4) of the magnetic pole module is fixed to the rotor yoke (1).
9. The permanent magnet motor as described in claim 8, characterized in that, The rotor yoke (1) is provided with a dovetail groove, and one side of the carrier plate (4) is a dovetail structure (41), and the dovetail structure (41) of the carrier plate (4) is inserted into the dovetail groove.
10. The permanent magnet motor as described in claim 8 or 9, characterized in that, At least one of the magnets and the pole box (3), the magnets (2) and the carrier plate (4), and the carrier plate (4) and the rotor yoke (1) is coated with glue or heat dissipation grease or a mixture of glue and heat dissipation grease.