Permanent magnet rotor magnetic material fixing structure and permanent magnet rotor

Abstract

The utility model discloses a permanent magnet rotor magnetic material fixing structure and a permanent magnet rotor, the permanent magnet rotor magnetic material fixing structure comprises a rotor iron core, a plurality of magnetic materials and two end covers respectively fixed on two end surfaces of the rotor iron core, the plurality of magnetic materials are arranged at intervals around the central axis of the rotor iron core, and the inner arc surfaces of the plurality of magnetic materials are attached to the outer circular surface of the rotor iron core; the plurality of magnetic materials are clamped between the two end covers; pressing and fixing parts are arranged on the side faces, close to each other, of every two adjacent magnetic materials, a fixing piece is arranged between every two adjacent magnetic materials, each fixing piece comprises a wedge block and a fixing screw penetrating through the wedge block, the wedge blocks are pressed on the pressing and fixing parts of the two adjacent magnetic materials at the same time, and the fixing screws are inserted into the rotor iron core and are in threaded connection with the rotor iron core. According to the utility model, when the magnetic material is installed on the iron core, the situation that the magnetic material is broken due to excessive extrusion on the magnetic material is avoided, so that the lossless installation of the magnetic material can be realized; and the fixing strength is high, and a stainless steel sleeve does not need to be sleeved outside the magnetic material, so that heat generated by the magnetic material is dissipated, and the heat dissipation effect of the rotor is better.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet motors, in particular to a permanent magnet rotor magnetic material fixing structure and a permanent magnet rotor. Background Technique

[0002] A permanent magnet motor refers to a type of motor that uses permanent magnets to provide excitation, mainly including components such as a stator, a rotor, and an end cover. Among them, the rotor includes a rotor core and permanent magnet materials installed on the rotor core. The rotor core is used to fixedly install the motor output shaft, and the permanent magnet materials are used to provide excitation to generate a driving torque between the permanent magnet materials and the stator, so as to drive the rotor core to drive the motor output shaft to output torque.

[0003] At present, the installation methods of permanent magnet materials in the prior art usually include the following two types. One is to process the permanent magnet materials into magnetic tiles. The magnetic tiles have an arc-shaped structure and are bonded to the outer ring of the rotor core. Due to the high-speed rotation of the rotor, a stainless steel sleeve needs to be sleeved on the bonded magnetic tiles to prevent the magnetic tiles from being displaced by centrifugal force. The above magnetic material installation method is not only complex in assembly, but the stainless steel sleeve will also increase the weight of the rotor, resulting in a reduction in rotor efficiency; and the sleeved stainless steel sleeve will also affect the heat dissipation during the high-speed operation of the rotor, thereby affecting the performance and service life of the motor.

[0004] The other is to equally and spacedly distribute several through-shaped accommodating parts around the rotating shaft of the rotor core, and bury the magnetic materials into the accommodating parts. In order to firmly place the magnetic materials in the accommodating parts, the size of the accommodating parts needs to be equal to or smaller than the magnetic materials. The accommodating parts will exert extrusion on the magnetic materials due to the burying action, resulting in the magnetic materials being easily broken; and if the size of the accommodating parts is larger than the magnetic materials, when the rotor rotates at a high speed, the magnetic materials are likely to collide with the accommodating parts and generate noisy noises. The above two installation methods both have some defects, so it is difficult to install the magnetic materials on the rotor core without damage and stably while ensuring the working efficiency and heat dissipation effect of the rotor. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a permanent magnet rotor magnetic material fixing structure and a permanent magnet rotor with non-destructive installation, high fixing strength and good heat dissipation effect.

[0006] To solve the above technical problem, in the first aspect, the permanent magnet rotor magnetic material fixing structure provided by the utility model adopts the following technical solutions:

[0007] A permanent magnet rotor magnetic material fixing structure, comprising a rotor core, a plurality of magnetic materials, and two end covers respectively fixed to both end faces of the rotor core. The magnetic materials are in an arc-shaped plate structure. A plurality of the magnetic materials are arranged around the cylindrical surface of the rotor core. A plurality of the magnetic materials are all clamped between the two end covers. Pressing and fixing parts are arranged on both straight edges of the two sides of a plurality of the magnetic materials. Fixing members are arranged between adjacent two of the magnetic materials. The fixing members simultaneously press on the pressing and fixing parts of adjacent two magnetic materials close to each other, and the fixing members are simultaneously fixedly connected to the rotor core.

[0008] By adopting the above technical solution, the pressing and fixing parts of adjacent two magnetic materials are pressed by the fixing members and locked relative to the rotor core. A plurality of fixing members cooperate with each other to jointly fix and lock a plurality of magnetic materials on the rotor core. The above structure can install the magnetic materials on the rotor core without excessively squeezing the magnetic materials to cause the magnetic materials to break, so that the magnetic materials can be installed without damage; and the fixing strength is relatively high, and there is no need to sleeve a stainless steel sleeve outside the magnetic materials, so that the heat generated by the magnetic materials can be dissipated, thereby making the heat dissipation effect of the rotor better; and reducing the entire stainless steel sleeve to several fixing members can also reduce the weight of the rotor, thereby improving the working efficiency of the rotor.

[0009] Optionally, the fixing member includes a wedge block and a fixing screw passing through the wedge block. The wedge block simultaneously presses on the pressing and fixing parts of adjacent two magnetic materials, and the fixing screw is threadedly connected to the rotor core.

[0010] By adopting the above technical solution, the pressing and fixing parts of adjacent two magnetic materials are pressed by the wedge block, and then the wedge block is locked relative to the rotor core by the fixing screw. The wedge blocks of a plurality of fixing members cooperate with each other to jointly fix and lock a plurality of wedge blocks on the rotor core, so as to install the magnetic materials on the rotor core without excessively squeezing the magnetic materials to cause the magnetic materials to break.

[0011] Optionally, the number of wedge blocks of the same fixing member is at least two. At least two wedge blocks simultaneously press on the pressing and fixing parts of adjacent two magnetic materials, and at least two wedge blocks are arranged at intervals along the axis of the rotor core.

[0012] By adopting the above technical solution, at least two wedge blocks can make the locking points of the magnetic materials more balanced, thereby further enhancing the fixing stability between the magnetic materials and the rotor core, and further avoiding the magnetic tiles from being displaced by centrifugal force. And there are gaps between at least two wedge blocks arranged at intervals. Compared with a whole long wedge block, it can better promote the heat dissipation effect when the rotor works.

[0013] Optionally, a stabilizing block is fixedly connected to the side surface of the wedge block facing the rotor core. The stabilizing block is clamped between adjacent two pressing and fixing parts, and the fixing screw passes through the stabilizing block.

[0014] By adopting the above technical solution, the stabilizing block is clamped in the pressing parts of two adjacent wedge blocks, which can limit the situation that the magnetic material shakes or shifts relative to the rotor core due to centrifugal force.

[0015] Optionally, the opposite side edges of two adjacent pressing parts are both arranged in an arc shape, the transition surface between the wedge block and the stabilizing block is arranged in an arc shape, and the transition surface between the wedge block and the stabilizing block is attached to the arc surface of the pressing part.

[0016] By adopting the above technical solution, by arranging the side edges of the pressing part, the transition surface between the wedge block and the stabilizing block in an arc shape, when the magnetic material and the pressing part are pressed by the wedge block and abutted by the stabilizing block, the stress received by the magnetic material and the pressing part is relatively more dispersed, thereby reducing the situation that the magnetic material and the pressing part are cracked due to stress concentration during locking.

[0017] Optionally, the wedge block is also in the structure of an arc-shaped plate and has the same radian as the magnetic material, and the outer arc surface of the wedge block and the magnetic material are located on the same cylindrical surface.

[0018] By adopting the above technical solution, the outer arc surface of the wedge block and the magnetic material being located on the same cylindrical surface can reduce the resistance received during the high-speed rotation of the rotor, thereby further improving the working efficiency of the rotor.

[0019] Optionally, the wedge block is provided with a counterbore, the fixing screw is a countersunk head bolt, and the screw head of the fixing screw is located in the counterbore.

[0020] By adopting the above technical solution, the screw head of the fixing screw being located in the counterbore can reduce the resistance received during the high-speed rotation of the rotor, thereby further improving the working efficiency of the rotor.

[0021] Optionally, a plurality of radiating fins are vertically arranged on one side surface of the two end covers away from the rotor core, and the plurality of radiating fins are arranged at intervals around the central axis of the rotor core.

[0022] By adopting the above technical solution, the plurality of radiating fins can further promote the dissipation of the heat generated by the magnetic material due to eddy current formation and hysteresis loss, thereby reducing the heat accumulation inside the rotor and improving the efficiency and power density of the rotor.

[0023] Optionally, the rotor core is provided with a plurality of heat dissipation channels, and the plurality of heat dissipation channels are all communicated with the external space.

[0024] By adopting the above technical solution, the plurality of heat dissipation channels in the rotor core can dissipate the heat transferred to the rotor core by the magnetic material, thereby further reducing the heat accumulation inside the rotor and improving the efficiency and power density of the rotor.

[0025] Optionally, a plurality of the heat dissipation channels are arranged at intervals around the central axis of the rotor core, and the two end covers are respectively provided with heat dissipation holes corresponding to the number of the heat dissipation channels, and the plurality of heat dissipation holes in the end cover communicate with the corresponding heat dissipation channels.

[0026] In a second aspect, the permanent magnet rotor provided by the present invention adopts the following technical solution:

[0027] A permanent magnet rotor includes the above permanent magnet rotor magnetic material fixing structure.

[0028] In summary, the present invention includes at least one of the following beneficial technical effects:

[0029] 1. By means of the wedge blocks and the fixing screws, the magnetic material can be installed on the rotor core without causing excessive extrusion of the magnetic material and resulting in the rupture of the magnetic material, so that the lossless installation of the magnetic material can be realized; and the fixing strength is relatively high, and there is no need to sleave a stainless steel sleeve outside the magnetic material, so that the heat generated by the magnetic material can be dissipated, thereby making the heat dissipation effect of the rotor better; and reducing the whole stainless steel sleeve into several small wedge blocks can also reduce the weight of the rotor, thereby improving the working efficiency of the rotor.

[0030] 2. At least two of the wedge blocks can make the locking points of the magnetic material more balanced, thereby further enhancing the fixing stability between the magnetic material and the rotor core, and further avoiding the dislocation of the magnetic tile due to the centrifugal force; and there is a gap between at least two wedge blocks arranged at intervals. Compared with a whole long wedge block, it can better promote the heat dissipation effect during the operation of the rotor.

[0031] 3. A plurality of heat dissipation fins and a plurality of heat dissipation channels can dissipate the heat transferred from the magnetic material into the rotor core, thereby further reducing the heat accumulation inside the rotor and improving the efficiency and power density of the rotor. Description of the Drawings

[0032] Figure 1 is a schematic structural diagram of the permanent magnet rotor in the present invention.

[0033] Figure 2 is a schematic structural diagram of the permanent magnet rotor magnetic material fixing structure of the present invention.

[0034] Figure 3 is a schematic structural diagram of the rotor core, magnetic material and fixing member in the present invention.

[0035] Figure 4 is Figure 2 a cross-sectional structural diagram along the line A-A.

[0036] Description of reference numerals: 1, rotor core; 2, magnetic material; 21, consolidation part; 3, end cover; 31, heat sink; 4, fixing member; 41, wedge; 411, stabilizing block; 42, fixing screw; 5, counterbore; 6, heat dissipation hole; 7, heat dissipation channel; 8, motor output shaft; 9, mounting screw. Detailed implementation manners

[0037] The following further describes the present utility model in detail with reference to the Figures 1-4 accompanying drawings.

[0038] An embodiment of the present utility model discloses a permanent magnet rotor magnetic material fixing structure and a permanent magnet rotor. Refer to Figure 1 and Figure 2 , the permanent magnet rotor includes a motor output shaft 8 and a permanent magnet rotor magnetic material fixing structure that is sleeved and fixedly installed on the motor output shaft 8. The permanent magnet rotor magnetic material fixing structure includes a rotor core 1, a plurality of magnetic materials 2, and two end covers 3. The rotor core 1 is in a cylindrical shape. In other embodiments of the present application, the motor output shaft 8 also passes through and is fixedly installed in the center of the rotor core 1, thus forming a permanent magnet rotor.

[0039] Both of the two end covers 3 are in a disc shape. The two end covers 3 are respectively located and attached to the two end faces of the rotor core 1. The two end covers 3 are respectively fixedly connected to the end faces of the rotor core 1 through a plurality of mounting screws 9. The plurality of mounting screws 9 are arranged at intervals around the central axis of the rotor core 1. Both of the two end covers 3 are provided with central holes for the motor output shaft 8 to pass through.

[0040] Refer to Figure 2 and Figure 3 , the plurality of magnetic materials 2 are all in an arc-shaped plate structure. The plurality of magnetic materials 2 are arranged at intervals around the central axis of the rotor core 1. The inner arc surfaces of the plurality of magnetic materials 2 are all attached to the outer circular surface of the rotor core 1. Consolidation parts 21 are integrally formed on the side surfaces of adjacent two magnetic materials 2 close to each other. The consolidation parts 21 are in a strip shape and the length direction is parallel to the axis of the rotor core 1. The consolidation parts 21 are also attached to the outer circular surface of the rotor core 1.

[0041] Refer to Figure 2 and Figure 3 , a fixing member 4 is arranged between adjacent two magnetic materials 2. The fixing member 4 includes a wedge 41 and a fixing screw 42. The wedge 41 is also in an arc-shaped plate structure. The radian of the wedge 41 is the same as that of the magnetic material 2. The number of the wedges 41 is at least two. In the embodiment of the present application, the number of the wedges 41 is set to two. The two wedges 41 are simultaneously pressed on the consolidation parts 21 of adjacent two magnetic materials 2. The wedge 41 also simultaneously abuts against adjacent two magnetic materials 2. The two wedges 41 are arranged at intervals along the axis of the rotor core 1, and the two wedges 41 respectively correspond to and are attached to the two end covers 3.

[0042] Refer to Figure 2 and Figure 3, the two wedges 41 and the outer arc surface of the magnetic material 2 are located on the same outer circular surface. The number of fixing screws 42 corresponds to the wedges 41. The fixing screws 42 pass through the wedges 41 and are inserted and threadedly connected to the rotor core 1 at the same time. A counterbore 5 is provided on the side surface of the wedge 41 away from the rotor core 1. The fixing screw 42 is a countersunk head bolt, and the screw head of the fixing screw 42 is located in the counterbore 5.

[0043] By pressing the pressing parts 21 of two adjacent magnetic materials 2 through the wedges 41, and then locking the wedges 41 relative to the rotor core 1 through the fixing screws 42, the wedges 41 of multiple fixing members 4 cooperate with each other to jointly fix and lock the multiple wedges 41 on the rotor core 1. Through the wedges 41 and the fixing screws 42, the magnetic material 2 can be installed on the rotor core 1 without causing excessive extrusion of the magnetic material 2 and resulting in the rupture of the magnetic material 2, so that the lossless installation of the magnetic material 2 can be realized; and the fixing strength is relatively high, and there is no need to sleeved a stainless steel sleeve outside the magnetic material 2, so that the heat generated by the magnetic material 2 can be dissipated, thereby making the heat dissipation effect of the rotor better; and reducing the whole stainless steel sleeve into several small wedges 41 can also reduce the weight of the rotor, thereby improving the working efficiency of the rotor.

[0044] The two wedges 41 can make the locking points of the magnetic material 2 more balanced, thereby further enhancing the fixing stability between the magnetic material 2 and the rotor core 1, and further preventing the magnetic tile from being displaced by the centrifugal force; and there is a gap between the two wedges 41 arranged at intervals. Compared with a whole long wedge 41, it can better promote the heat dissipation effect during the operation of the rotor. And the fact that the wedges 41 and the outer arc surface of the magnetic material 2 are located on the same outer circular surface can reduce the resistance suffered by the rotor during high-speed rotation, and the screw head of the fixing screw 42 is located in the counterbore 5, which can further reduce the resistance suffered by the rotor during high-speed rotation, thereby further improving the working efficiency of the rotor.

[0045] Refer to Figure 2 and Figure 3 In order to further improve the installation stability of the magnetic material 2, a stabilizing block 411 is integrally formed on the side surface of the wedge 41 facing the rotor core 1. The stabilizing block 411 fits on the outer circular surface of the rotor core 1, and the stabilizing block 411 is clamped between two adjacent pressing parts 21. The fixing screw 42 passes through the stabilizing block 411 at the same time. The stabilizing block 411 is clamped in the pressing parts 21 of two adjacent wedges 41, which can limit the situation that the magnetic material 2 shakes or shifts relative to the rotor core 1 due to the centrifugal force, thereby further improving the installation stability of the magnetic material 2.

[0046] Refer to Figure 2 and Figure 3, in order to reduce the possibility of the wedge block 41 cracking when the wedge block 41 presses and fixes the magnetic material 2 to the rotor core 1, the transition surface between the wedge block 41 and the stabilizing block 411 is arranged as an arc surface, and the transition surface between the wedge block 41 and the stabilizing block 411 is arranged in a fitting manner with the arc surface of the pressing and fixing portion 21. By arranging the side edge of the pressing and fixing portion 21, the transition surface between the wedge block 41 and the stabilizing block 411 as arc surfaces, when the magnetic material 2 and the pressing and fixing portion 21 are pressed by the wedge block 41 and abutted by the stabilizing block 411, the stress received by the magnetic material 2 and the pressing and fixing portion 21 is relatively more dispersed, thereby reducing the situation of cracking of the magnetic material 2 and the pressing and fixing portion 21 due to stress concentration during locking.

[0047] Refer to Figure 2 and Figure 4 , to further improve the heat dissipation effect when the rotor works, a plurality of heat dissipation fins 31 are fixedly connected to the side surfaces of the two end covers 3 away from the rotor core 1. The plurality of heat dissipation fins 31 are all perpendicular to the end covers 3, and the plurality of heat dissipation fins 31 are arranged at intervals around the central axis of the rotor core 1. The mounting screw 9 is located between two adjacent heat dissipation fins 31.

[0048] Refer to Figure 2 and Figure 4 , a plurality of heat dissipation channels 7 are formed in the rotor core 1. The plurality of heat dissipation channels 7 are arranged at intervals around the central axis of the rotor core 1. The heat dissipation channels 7 penetrate through the rotor core 1, and the axis of the heat dissipation channels 7 is parallel to the axis of the rotor core 1. The two end covers 3 are respectively provided with a plurality of heat dissipation holes 6. The number of the heat dissipation holes 6 corresponds to the heat dissipation channels 7, and the plurality of heat dissipation holes 6 communicate with the corresponding heat dissipation channels 7.

[0049] The plurality of heat dissipation fins 31 can promote the dissipation of the heat generated by the magnetic material 2 due to eddy current and hysteresis loss, thereby reducing the heat accumulation inside the rotor and improving the efficiency and power density of the rotor. The plurality of heat dissipation channels 7 in the rotor core 1 can dissipate the heat transferred from the magnetic material 2 to the rotor core 1, thereby further reducing the heat accumulation inside the rotor and improving the efficiency and power density of the rotor.

[0050] The implementation principle of the permanent magnet rotor magnetic material fixing structure in the embodiment of the present utility model is as follows: the pressing and fixing portions 21 of two adjacent magnetic materials 2 are pressed by the wedge block 41, and then the wedge block 41 is locked relative to the rotor core 1 through the fixing screw 42. The wedge blocks 41 of the plurality of fixing members 4 cooperate with each other to jointly fix and lock the plurality of wedge blocks 41 on the rotor core 1. Through the wedge block 41 and the fixing screw 42, the magnetic material 2 can be installed on the rotor core 1 without causing excessive extrusion of the magnetic material 2 and resulting in cracking of the magnetic material 2, thereby realizing the non-destructive installation of the magnetic material 2; and the fixing strength is relatively high, and there is no need to sleeve a stainless steel sleeve outside the magnetic material 2, so that the heat generated by the magnetic material 2 can be dissipated, thereby making the heat dissipation effect of the rotor better.

[0051] The above are all preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited thereby. Therefore, all equivalent changes made according to the structure, shape and principle of the present utility model shall be covered within the protection scope of the present utility model.

Claims

1. A permanent magnet rotor magnetic material fixing structure, comprising a rotor core (1), a plurality of magnetic materials (2), and two end covers (3) respectively fixed to both end faces of the rotor core (1). The magnetic materials (2) are in an arc-shaped plate structure, and the plurality of magnetic materials (2) are arranged around the cylindrical surface of the rotor core (1). The plurality of magnetic materials (2) are all clamped between the two end covers (3), and it is characterized in that: Pressing and fixing parts (21) are arranged on both straight edges of multiple said magnetic materials (2). Fixing parts (4) are arranged between adjacent two said magnetic materials (2). The fixing parts (4) are simultaneously pressed on the pressing and fixing parts of adjacent two magnetic materials (2) close to each other, and the fixing parts (4) are simultaneously fixedly connected to the rotor core (1).

2. The permanent magnet rotor magnetic material fixing structure according to claim 1, characterized in that: The fixing part (4) includes a wedge block (41) and a fixing screw (42) passing through the wedge block (41). The wedge block (41) is simultaneously pressed on the pressing and fixing parts (21) of adjacent two magnetic materials (2), and the fixing screw (42) is threadedly connected to the rotor core (1).

3. The permanent magnet rotor magnetic material fixing structure according to claim 2, characterized in that: The number of wedge blocks (41) of the same fixing part (4) is at least two. At least two said wedge blocks (41) are simultaneously pressed on the pressing and fixing parts (21) of adjacent two magnetic materials (2), and at least two said wedge blocks (41) are arranged at intervals along the axis of the rotor core (1).

4. The permanent magnet rotor magnetic material fixing structure according to any one of claims 2 or 3, characterized in that: A stabilizing block (411) is fixedly connected to one side surface of the wedge block (41) facing the rotor core (1). The stabilizing block (411) is clamped between adjacent two pressing and fixing parts (21), and the fixing screw (42) passes through the stabilizing block (411).

5. The permanent magnet rotor magnetic material fixing structure according to claim 4, characterized in that: The opposite side edges of adjacent two said pressing and fixing parts (21) are both arranged in an arc shape. The transition surface of the wedge block (41) and the stabilizing block (411) is arranged in an arc shape, and the transition surface of the wedge block (41) and the stabilizing block (411) is attached to the arc surface of the pressing and fixing part (21).

6. The permanent magnet rotor magnetic material fixing structure according to any one of claims 2 or 3, characterized in that: The wedge block (41) is also in an arc-shaped plate structure and has the same radian as the magnetic material (2). The outer arc surface of the wedge block (41) and the magnetic material (2) are located on the same cylindrical surface.

7. The permanent magnet rotor magnetic material fixing structure according to any one of claims 2 or 3, characterized in that: The wedge block (41) is provided with a counterbore (5). The fixing screw (42) is a countersunk head bolt, and the screw head of the fixing screw (42) is located in the counterbore (5).

8. The permanent magnet rotor magnetic material fixing structure according to any one of claims 1-3, characterized in that: A plurality of heat dissipation fins (31) are vertically arranged on one side surface of two said end covers (3) away from the rotor core (1). The plurality of heat dissipation fins (31) are arranged at intervals around the central axis of the rotor core (1).

9. The permanent magnet rotor magnetic material fixing structure according to any one of claims 1-3, characterized in that: The rotor core (1) is provided with a plurality of heat dissipation channels (7), and the plurality of heat dissipation channels (7) are all communicated with the external space.

10. A permanent magnet rotor, characterized in that: Including the permanent magnet rotor magnetic material fixing structure according to any one of claims 1-9.

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