Manufacturing device and method of permanent magnet
By designing a permanent magnet manufacturing device including a rotating shaft, a magnet rotor, a fixture, a heater and a magnetizer, the problems of insufficient magnetization, high energy consumption and poor magnetization uniformity in the prior art are solved, and a more efficient and reliable permanent magnet manufacturing is achieved.
Patent Information
- Application Number
- CN202510005000.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-02
- Publication Date
- 2025-04-18
AI Technical Summary
In the prior art, there are problems such as insufficient magnetization, high energy consumption, poor magnetization uniformity, and low operating complexity and production efficiency, especially when producing magnets with high coercive forces.
A permanent magnet manufacturing device is designed, including a rotating shaft, a magnet rotor, a fixture, a heater and a magnetizer. The direction of the rotating shaft is consistent with the conveying direction of the heating permanent magnet rotor, and simultaneous heating, continuous conveying and magnetization are achieved to ensure uniform distribution of thermal energy and uniformity of magnetization.
The production efficiency, heating uniformity, magnetization efficiency and device stability are improved, and the problems of insufficient magnetization, high energy consumption and poor magnetization uniformity are solved, thereby achieving more efficient and reliable permanent magnet manufacturing.
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Figure CN119853376A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of permanent magnet manufacturing, and in particular to a permanent magnet manufacturing device and method. Background Art
[0002] In recent years, magnets with high coercive force compared to rare earth magnets are sometimes used as magnet rotors of electric motors, etc., because magnets with high coercive force have an advantage of high heat resistance.
[0003] There is also a method of multi-pole magnetization of a blank magnet mounted on a permanent magnet rotor in the prior art. For example, a hole is inserted into the magnetizing device so that the magnetized rotor can enter and exit, and the hole is set at the center of the magnetizing yoke. A groove extending in the axial direction is formed on the inner wall surface of the hole according to the number of poles to be magnetized. A conductor with an insulating coating is buried in the groove, and adjacent conductors form a coil in a continuous folded shape. By inserting the magnetized object into such a hole, the charge accumulated in the capacitor is instantly released, so that a pulse current flows through the coil, and the magnetizing magnetic field generated on the magnetizing yoke can magnetize the blank magnet mounted on the rotor. In order to produce a magnet with high magnetization coercive force, a high magnetizing magnetic field is required, which makes the magnetizing device larger or more electric power; in particular, for the magnetization of the blank magnet with a small crystal particle size, two magnetizations are required to achieve sufficient magnetization; this consumes energy and power for a long time. If the magnetization is not sufficient, the motor characteristics cannot be obtained, and irreversible demagnetization is likely to occur when the temperature rises.
[0004] At the same time, in the prior art, there is a method in which the heater and the magnetizer are arranged axially as separate structures, and the holding part of the magnetized object can move relatively to the heater and the magnetizer. The heater is set to a temperature above the Curie point of the magnetizer, and the magnetizer becomes a temperature lower than the Curie point of the magnetizer. The magnetized object heated by the heater is moved to the magnetizer and magnetized. The magnetization device heats the magnetized object to a temperature above the Curie point through the heater, then transfers it to the magnetizer for magnetization, and then cools it to a temperature lower than the Curie point. During this period, the operation of continuously applying the magnetizing magnetic field can be quickly and easily through a series of operations, and the magnetization workability is improved. Therefore, even an annular permanent magnet with a very small diameter and a narrow magnetization spacing such as a multi-pole will not be insufficiently magnetized. In order to solve the above problems, we propose a manufacturing device and method for permanent magnets. Summary of the invention
[0005] In view of the shortcomings of the prior art, the present application provides a permanent magnet manufacturing device and method to solve the problems existing in the prior art, such as insufficient magnetization, high energy consumption, poor magnetization uniformity, operation complexity and low production efficiency.
[0006] To achieve the above objectives, this application provides the following technical solutions:
[0007] In a first aspect, the present application provides a permanent magnet manufacturing device, comprising a rotating shaft, a magnet rotor, two sets of clamps, a heater, and a magnetizer.
[0008] A rotating shaft is fixedly installed at the center of the magnet rotor, a pre-magnetized blank magnet is installed on the iron core of the magnet rotor, two sets of clamps are installed at the two ends of the rotating shaft and are used to clamp the two ends of the rotating shaft, the magnet rotor is inserted into the center hole of the heater, and the rotating shaft is maintained at the center of the heating hole of the heater.
[0009] As a further technical solution of the present invention, it also includes a machine base, and the two groups of the clamps, the heater and the magnetizer are installed on the machine base.
[0010] As a further technical solution of the present invention, the magnet rotor is composed of two end plates with a central opening and an iron core, the iron core is formed by stacking multiple electromagnetic steel plates, and the iron core is provided with slots for placing the magnets of the blank before magnetization, and the number of the slots is set to 2+N.
[0011] As a further technical solution of the present invention, the heating and releasing heat energy inside the heater is evenly arranged according to the number of slots and the horizontal direction of the rotating axis. The multi-pole magnetization inside the magnetizer is evenly arranged according to the number of slots and the horizontal direction of the rotating axis.
[0012] As a further technical solution of the present invention, the path of the magnet rotor before heating of the internal conveyor clamp of the heater is connected to the path of the magnet rotor after heating of the internal conveyor clamp of the magnetizer, and forms a straight path.
[0013] In a second aspect, the present application also provides a method for manufacturing a permanent magnet, comprising the following steps:
[0014] S1: Blank magnet heating process: the blank magnet before magnetization is mounted on the iron core of the magnet rotor having the rotating shaft at the center, the two ends of the rotating shaft are clamped by the clamp, and the obtained rod-shaped magnet rotor with clamp is inserted into the center hole of the heater from one end thereof, and the magnet rotor with clamp is heated in a state where the rotating shaft is kept at the center of the heating hole and kept horizontal to the direction of the heating hole; after heating, the magnet rotor with clamp is discharged in a manner where the other end is first;
[0015] S2: Magnetization process of blank magnet: continuously insert the heated rod-shaped magnet rotor with clamp from one end thereof into the center hole of the magnetizer, magnetize the magnet rotor with clamp while keeping the rotating shaft at the center of the magnetization hole and in a horizontal state with the direction of the magnetization hole, and discharge the magnet rotor with clamp in a manner of the other end first after magnetization to obtain the magnetized permanent magnet installed on the iron core of the magnet rotor.
[0016] The present invention provides a device and method for manufacturing a permanent magnet, which has the following beneficial effects:
[0017] 1. A permanent magnet manufacturing device of the present invention makes the direction of the rotating shaft consistent with the conveying direction of the heated permanent magnet rotor, and the two are heated, conveyed and magnetized continuously at the same time, so that the set heat energy can be maintained without loss, thereby improving efficiency.
[0018] 2. The magnet rotor is heated more evenly in the heater. Uniform heating can ensure the uniform temperature distribution of the magnet material before magnetization, which helps the uniform arrangement of the magnetic domains during the magnetization process. Uneven heating will cause thermal stress inside the material, which may destroy the microstructure of the material and affect the magnetic properties. Uniform heating can reduce the generation of such thermal stress and protect the integrity of the material.
[0019] 3. Dynamic magnetization can be achieved by rotating the magnet rotor in the magnetizer. Compared with static magnetization, this dynamic magnetization method can more effectively rearrange the magnetic domains inside the magnet material, thereby improving the magnetization efficiency. The rotating magnet rotor can ensure that each part can evenly receive the magnetic field of the magnetizer, avoiding the uneven magnetization phenomenon that may occur during static magnetization.
[0020] 4. Through the design of the machine base, slideway, internal spline sleeve, fixture and other structures, the magnet rotor is automatically moved to the heater and magnetizer for positioning and rotation, which improves the stability, reliability and production automation of the device.
[0021] In summary, the present invention improves production efficiency, heating uniformity, magnetization efficiency and device stability by optimizing the manufacturing device and method of permanent magnets, and provides a more efficient and reliable solution for the manufacture of permanent magnets. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 is a schematic cross-sectional view showing a specific example of a heating process;
[0023] Figure 2 is a schematic cross-sectional view showing a specific example of the magnetization process;
[0024] Figure 3 It is a schematic three-dimensional diagram of the combination of the magnet rotor and the rotating shaft;
[0025] Figure 4 It is a schematic three-dimensional diagram showing the upper end plate, lower end plate and core assembly of the magnet rotor;
[0026] Figure 5 Schematic diagram of a specific embodiment showing the relationship between the temperature, effective magnetic field, and magnetic susceptibility of a permanent magnet before magnetization Figure 1 ;
[0027] Figure 6 Schematic diagram of a specific embodiment showing the relationship between the temperature, effective magnetic field, and magnetic susceptibility of a permanent magnet before magnetization Figure 2 ;
[0028] Figure 7 Schematic diagram of a specific embodiment showing the relationship between the temperature, effective magnetic field, and magnetic susceptibility of a permanent magnet before magnetization Figure 3 ;
[0029] Figure 8 Schematic diagram of a specific embodiment showing the relationship between the temperature, effective magnetic field, and magnetic susceptibility of a permanent magnet before magnetization Figure 4 ;
[0030] Fig. 9 It is a structural schematic diagram of a permanent magnet manufacturing device according to the second embodiment of the present invention;
[0031] Fig.10 is a cross-sectional view of a permanent magnet manufacturing device according to a second embodiment of the present invention;
[0032] Fig.11 It is a partial structural enlarged schematic diagram of a permanent magnet manufacturing device according to the second embodiment of the present invention;
[0033] Fig.12 It is a partial structural exploded schematic diagram of a permanent magnet manufacturing device according to the second embodiment of the present invention.
[0034] In the figure: a fixture 10, a blank magnet 11, a rotating shaft 20, a magnet rotor 30, an iron core 31, an end plate 32, a slot 33, a heater 40, a magnetizer 50, a base 101, a slideway 102, an inner spline sleeve 103, a round rod 104, a vertical plate 105, an outer spline 106, a lead screw 107, a connecting shaft 108, a first gear 109, a first motor 110, a second gear 111, an annular sleeve 112, a gear ring 113, a second motor 114, and an incomplete gear 115. DETAILED DESCRIPTION
[0035] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.
[0036] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.
[0037] In the following, in conjunction with the accompanying drawings, a manufacturing device and method for a permanent magnet provided in an embodiment of the present application are described in detail through specific embodiments and their application scenarios.
[0038] Embodiment 1
[0039] Reference Figure 1-Figure 8 As shown, a permanent magnet manufacturing device includes a rotating shaft 20, a magnet rotor 30, two sets of clamps 31, a heater 40 and a magnetizer 50.
[0040] The rotating shaft 20 is fixedly mounted at the center of the magnet rotor 30, the pre-magnetized blank magnet 11 is mounted on the iron core of the magnet rotor 30, two sets of clamps 31 are mounted at both ends of the rotating shaft 20 and are used to clamp both ends of the rotating shaft 20, the magnet rotor 30 is inserted into the center hole of the heater 40, and the rotating shaft 20 is kept at the center of the heating hole of the heater 40. The magnet rotor is heated more evenly in the heater, which helps the uniform arrangement of magnetic domains during the magnetization process, and the uniform heating can reduce the generation of thermal stress and protect the integrity of the material.
[0041] The magnet rotor 30 is composed of two end plates 32 with a central opening and an iron core 31. The iron core 31 is formed by stacking a plurality of electromagnetic steel plates. The iron core 31 is provided with slots 33 for placing the blank magnets 11 before magnetization. The number of slots 33 is set to 2+N. The design of 2+N slots provides flexibility and can accommodate blank magnets of different numbers or sizes, while ensuring accurate positioning and stable placement of the magnets in the rotor. The two end plates 32 with a central opening provide structural support for the rotor to ensure its stability during rotation. The iron core 31 is formed by stacking a plurality of electromagnetic steel plates, which helps to reduce eddy current losses and improve magnetic efficiency.
[0042] The heat released by the heating inside the heater 40 is uniformly arranged according to the number of slots 33 and the horizontal direction of the rotating shaft 20. This uniform arrangement ensures that the blank magnet 11 in each slot 33 can be uniformly heated, which helps to control the temperature during the magnetization process and improve the magnetization effect and consistency. The multi-pole magnetization inside the magnetizer 50 is arranged according to the number of slots 33 and the horizontal direction of the rotating shaft 20. The multi-pole magnetization design can be precisely configured according to the number and position of the slots 33 to provide a uniform magnetic field for each blank magnet 11, ensuring the uniformity and consistency of the magnetization process. This design helps to improve the magnetization efficiency and reduce the energy loss during the magnetization process.
[0043] The path of the magnet rotor 30 before heating of the conveyor clamp 31 inside the heater 40 is connected to the path of the magnet rotor 30 after heating of the conveyor clamp 31 inside the magnetizer 50, and forms a straight path. By rotating the magnet rotor in the magnetizer, a dynamic magnetization process is realized, and the dynamic magnetization method can more effectively rearrange the magnetic domains inside the magnet material. The paths of the heater and the magnetizer are connected to form a straight path, which is convenient for continuous operation.
[0044] In the heating step, the pre-heating magnet rotor 30 with the jig 10 is heated so that the minimum temperature of the pre-magnetization blank magnet 11 is above a predetermined temperature, thereby obtaining a heated rotor with the jig. In the magnetizing step, the pre-magnetization blank magnet 11 is magnetized and then cooled so that the maximum temperature thereof is below a predetermined temperature, thereby obtaining a permanent magnet.
[0045] The core 31 may be formed by laminating a plurality of electromagnetic steel sheets punched into a predetermined shape (circular shape, etc.). Alternatively, the core 31 may be formed by laminating a plurality of soft magnetic plates, or by using powdered resin powder and mixing and compressing the powdered core.
[0046] End plates 32 are respectively installed on the two end surfaces of the core 31 in the direction parallel to the rotating shaft 20 to prevent the pre-magnetized blank magnet 11 from falling off in the direction parallel to the rotating shaft 20. Considering the dimensional tolerance, the thickness of the pre-magnetized blank magnet 11 must be smaller than the thickness of the slot 33 so that it can be reliably inserted into the slot 33. In the present invention, it means that the two ends of the rotating shaft 20 are held by the clamping fixture 10, and the clamping fixture 10, the rotating shaft 20 and the magnet rotor 30 are in the shape of a rod as a whole.
[0047] The pre-heating magnet rotor 30 with the jig 10 is heated to raise the temperature of the pre-magnetized blank magnet 11 contained therein. The parts of the jig 10 that contact both ends of the rotating shaft 20 are preferably made of heat insulating materials. When the pre-heating magnet rotor 30 with the jig 10 is heated, the pre-magnetized blank magnet 11 can be effectively heated to prevent the rotating shaft 20 from transferring heat to the jig 10, thereby reducing the deterioration of thermal efficiency.
[0048] The aforementioned specified temperature can be calculated as follows:
[0049] First, a blank magnet 11 before magnetization is arranged in a slot is prepared, and a sample of the blank magnet taken out from the same production batch is taken out. Then, a pulse BH measuring device (PBH-1000) is used to measure the magnetic field curves (JH curves) of various maximum measured magnetic fields (such as magnetic fields of 0.5T, 1T, 2T, and 5T) at room temperature (23°C). From the JH curves of each maximum measured magnetic field, a BH curve ( Figure 5 ), the coercive force bHc can be obtained at the intersection of the second quadrant of the BH curve and the horizontal axis (magnetic field axis). When bHc above the maximum magnetic field of 5T is set to (bHc)max, the value obtained by dividing bHc in each maximum measured magnetic field by (bHc)max (=bHc / (bHc)max) is defined as the critical magnetic susceptibility, and then the same measurement is performed at high temperatures (such as 70°C, 100°C, and 150°C) to obtain the magnetic susceptibility in each maximum measured magnetic field at each temperature. In the above, the "magnetic field" is the so-called "effective magnetic field" that effectively crosses the blank magnet 11.
[0050] According to the relationship between the temperature, effective magnetic field and magnetic susceptibility of the blank magnet 11 before magnetization, the values of the temperature and effective magnetic field of the blank magnet 11 before magnetization at the saturation magnetic susceptibility (magnetic susceptibility is above 0.98) are obtained. Figure 7 In the figure, it shows the effective magnetic field in P1, P2, P3, and P4 as comparison points read for saturation magnetization when the permanent magnet temperature before magnetization is 150°C, 100°C, 70°C, and RT; Figure 8 yes Figure 7 Partial enlarged image (magnetic susceptibility is above 0.98). Figure 8 This is a graph showing the relationship between the temperature at which saturation magnetization is obtained in a permanent magnet before magnetization and the effective magnetic field. If the effective magnetic field is determined during magnetization after heating, the temperature at which complete magnetization can be obtained can be obtained from the relationship X using the magnetic field.
[0051] In addition, this embodiment also provides a method for manufacturing a permanent magnet, comprising the following steps:
[0052] S1: Blank magnet heating process: the blank magnet 11 before magnetization is mounted on the iron core 31 of the magnet rotor 30 having the rotating shaft 20 at the center, the two ends of the rotating shaft 20 are clamped by the clamp 10, and the obtained rod-shaped magnet rotor 30 with the clamp is inserted into the center hole of the heater 40 from one end thereof, and the magnet rotor 30 with the clamp is heated in a state where the rotating shaft 20 is kept at the center of the heating hole and kept horizontal to the direction of the heating hole; after heating, the magnet rotor 30 with the clamp 10 is discharged in a manner where the other end is first;
[0053] S2: Magnetization process of blank magnet: continuously insert the heated rod-shaped magnet rotor 30 with the clamp 10 from one end into the center hole of the magnetizer 50, and magnetize the magnet rotor 30 with the clamp 10 while keeping the rotating shaft 20 at the center of the magnetization hole and in a horizontal state with the direction of the magnetization hole. After magnetization, the magnet rotor 30 with the clamp 10 is discharged in a manner of the other end first, and the magnetized permanent magnet installed on the iron core 31 of the magnet rotor 30 is obtained.
[0054] Figure 1 The fixture 10 shown is composed of two arms, which hold the heated magnet rotor 30. The sensors confirm that these positions are consistent. The rotating shaft 20 of the heated magnet rotor is moved by the two arms, and then Figure 2 As shown, the magnet 11 is moved to a predetermined position in the magnetizer 50, the blank magnet 11 in the magnetizer 50 is magnetized, cooled after magnetization, the magnet rotor 30 is taken out from the magnetizer 50, the magnet rotor 30 is removed, and the end plate 32 is opened to take out the permanent magnet.
[0055] Embodiment 2
[0056] Reference Figure 1-Figure 12 As shown in FIG. 1 , as another preferred embodiment of the present invention, the difference from Embodiment 1 is that it further includes a machine base 101, and two sets of clamps 31, a heater 40 and a magnetizer 50 are installed on the machine base 101. Two slideways 102 arranged at intervals are fixedly installed on the machine base 101, and the slideway 102 is a cross slideway. The clamps 31 at both ends are slidably arranged in the two slideways 102 respectively, and two internal spline sleeves 103 arranged at intervals can be installed on the machine base 101. The clamps 31 pass through the internal spline sleeves 103 on both sides and are spline-matched with the internal spline sleeves 103.
[0057] Among them, the clamp 31 includes a round rod 104 and a vertical plate 105, the round rod 104 and the vertical plate 105 are fixedly connected together, the two ends of the rotating shaft 20 are fixedly connected to the round rods 104 on both sides, the round rod 104 penetrates the machine base 101 and the internal spline sleeve 103, the upper ends of the vertical plates 105 are slidably set in the slideway 102, the round rod 104 is fixedly connected with an external spline 106, and the round rod 104 is spline-matched with the internal spline sleeve 103 on the same side.
[0058] Among them, a lead screw 107 is rotatably mounted on the machine base 101, the lead screw 107 passes through the vertical plate 105 on one side and is threadedly connected with the vertical plate 105, a connecting shaft 108 is fixedly mounted on one end of the lead screw 107, the connecting shaft 108 is rotatably mounted on the machine base 101, a first gear 109 is fixedly mounted on one end of the connecting shaft 108, a first motor 110 is fixedly mounted on the machine base 101, a second gear 111 is fixedly mounted on the output shaft end of the first motor 110, the second gear 111 is meshed with the first gear 109, and the second gear 111 is reduced in speed to the first gear 109. Through the above structural design, it is convenient for the magnet rotor to automatically move into the heater and the magnetizer.
[0059] Among them, an annular sleeve 112 is fixedly installed at the end of the inner spline sleeve 103 on one side, and the annular sleeve 112 is sleeved outside the round rod 104. A ring gear 113 is fixedly installed at one end of the annular sleeve 112. A second motor 114 is fixedly installed on the machine base 101. An incomplete gear 115 is fixedly installed on the output shaft end of the second motor 114, and the incomplete gear 115 is meshed with the ring gear 113. An isolation cover 116 is fixedly installed outside the machine base 101, and the isolation cover 116 is used to isolate the lead screw 107, the first motor 110, the ring gear 113, and the incomplete gear 115 from the staff.
[0060] The working principle of this embodiment is as follows: the second gear 111 is driven to rotate by the first motor 110, and the second gear 111 drives the first gear 109 to rotate, which can drive the connecting shaft 108 and the lead screw 107 to rotate synchronously, and can drive the vertical plate 105, the round rod 104 and the magnet rotor 30 to move horizontally, thereby driving the magnet rotor 30 to move into the heater 40 and the magnetizer 50. When the magnet rotor 30 moves into the heater 40 and the magnetizer 50, the incomplete gear 115 is driven to rotate by the second motor 114, and the incomplete gear 115 intermittently drives the ring gear 113 to rotate, and the ring gear 113, the annular sleeve 112 and the inner spline sleeve 103 rotate synchronously, and the inner spline sleeve 103 drives the round rod 104 to rotate through the outer spline 106, thereby driving the magnet rotor 30 between the two round rods 104 to rotate, so that the magnet rotor 30 can rotate in the heater 40 and the magnetizer 50. The magnet rotor 30 is heated more evenly in the heater 40. Uniform heating can ensure that the temperature distribution of the magnet material is consistent before magnetization, which helps to evenly arrange the magnetic domains during the magnetization process. Uneven heating can cause thermal stress inside the material, which may destroy the microstructure of the material and affect the magnetic properties. Uniform heating can reduce the generation of such thermal stress and protect the integrity of the material.
[0061] At the same time, by rotating the magnet rotor 30 in the magnetizer 50, a dynamic magnetization process can be achieved. Compared with static magnetization, this dynamic magnetization method can more effectively rearrange the magnetic domains inside the magnet material, thereby improving the magnetization efficiency. The magnet rotor in the rotating process can ensure that each part can evenly receive the magnetic field of the magnetizer, avoiding the uneven magnetization phenomenon that may occur during static magnetization.
[0062] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.
[0063] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.
Claims
1. A permanent magnet manufacturing device, characterized in that: It comprises a rotating shaft (20), a magnet rotor (30), two sets of clamps (31), a heater (40) and a magnetizer (50); A rotating shaft (20) is fixedly mounted at the center of the magnet rotor (30), a pre-magnetized blank magnet (11) is mounted on the iron core of the magnet rotor (30), two sets of clamps (31) are mounted at the two ends of the rotating shaft (20) and are used to clamp the two ends of the rotating shaft (20), the magnet rotor (30) is inserted into the center hole of the heater (40), and the rotating shaft (20) is maintained at the center of the heating hole of the heater (40).
2. The permanent magnet manufacturing device according to claim 1, characterized in that: It also includes a machine base (101), on which the two sets of clamps (31), the heater (40) and the magnetizer (50) are mounted.
3. The permanent magnet manufacturing device according to claim 1, characterized in that: The magnet rotor (30) is composed of two end plates (32) with a central opening and an iron core (31). The iron core (31) is formed by stacking a plurality of electromagnetic steel plates. A slot (33) for placing the pre-magnetized blank magnet (11) is provided on the iron core (31). The number of the slots (33) is set to 2+N.
4. The permanent magnet manufacturing device according to claim 3, characterized in that: The heating and heat release inside the heater (40) is evenly arranged according to the number of slots (33) and the horizontal direction of the rotating shaft (20). The multi-pole magnetization inside the magnetizer (50) is evenly arranged according to the number of slots (33) and the horizontal direction of the rotating shaft (20).
5. The permanent magnet manufacturing device according to claim 4, characterized in that: The path of the magnet rotor (30) before heating of the conveyor clamp (31) inside the heater (40) is connected to the path of the magnet rotor (30) after heating of the conveyor clamp (31) inside the magnetizer (50) to form a straight path.
6. A method for manufacturing a permanent magnet, implemented using the permanent magnet manufacturing device according to claim 5, characterized in that: The following steps are involved: S1: Blank magnet heating process: the blank magnet (11) before magnetization is mounted on the iron core (31) of the magnet rotor (30) having the rotating shaft (20) at the center, the two ends of the rotating shaft (20) are clamped by the clamp (10), and the obtained rod-shaped magnet rotor (30) with the clamp is inserted into the center hole of the heater (40) from one end thereof, and the magnet rotor (30) with the clamp is heated in a state where the rotating shaft (20) is kept at the center of the heating hole and kept horizontal with the direction of the heating hole; after heating, the magnet rotor (30) with the clamp (10) is discharged in a manner where the other end is first; S2: Magnetizing process of blank magnets: continuously inserting the heated rod-shaped magnet rotor (30) with a clamp (10) into the center hole of the magnetizer (50) from one end thereof, magnetizing the magnet rotor (30) with the clamp (10) while keeping the rotating shaft (20) at the center of the magnetizing hole and in a horizontal state with the direction of the magnetizing hole, and after magnetization, discharging the magnet rotor (30) with the clamp (10) in a manner of the other end first, and obtaining the magnetized permanent magnet installed on the iron core (31) of the magnet rotor (30).