Brushless motor rotor magnetizing device and method

Abstract

The invention discloses a brushless motor rotor magnetizing device and method, and relates to the technical field of motor magnetizing, the brushless motor rotor magnetizing device comprises a base, an electric lifting rod is fixedly connected to the top of the base, a lifting plate is fixedly connected to the top end of the electric lifting rod, a magnetizer is arranged at the bottom of the lifting plate, and a motor rotor is arranged below the magnetizer; a magnetizing clamping mechanism is arranged at the top of the base; by arranging the magnetizing clamping mechanism, a pushing telescopic hinge rod, a hinge block A and a sliding clamping block are tightly clamped in a clamping groove through the elastic force of a spring, the inner wall of the motor rotor is tightly extruded through extrusion force, the automatic clamping effect on the motor rotor is completed, and it is avoided that when a magnetizer is pressed downwards to be powered on, the motor rotor is damaged. The problem of non-uniform magnetizing caused by the fact that the position of the motor rotor is not fixed is solved, and the magnetizing efficiency of the motor rotor is improved through the rapid fixing mode.

Description

Technical Field

[0001] The present invention relates to the technical field of motor magnetization, and in particular to a brushless motor rotor magnetization device and method. Background Art

[0002] The magnetizer has a relatively simple structure. It is actually an electromagnet with extremely strong magnetic force, equipped with iron blocks of various shapes as additional magnetic poles to form a closed magnetic circuit with the magnetized object. When magnetizing, the additional magnetic poles and the magnetized object are arranged, and the magnetizing current is applied, and the process is completed instantly. A magnetizing device and a magnetizing method for an internal permanent magnet synchronous motor rotor described in a patent application with publication number CN111540562B include a base, support frames are fixedly connected to the left and right sides of the base, and a rotor to be magnetized is rotatably connected between the two support frames; magnetizing poles are slidably connected to the front and rear sides of the base; a positioning sleeve that moves along the axial direction of the rotor is provided on the left or right side of the rotor, and positioning baffles located between the upper and lower parts of the two magnetizing poles are axially extended at the top and bottom of the positioning sleeve respectively; the two magnetizing poles have a circular arc structure that is symmetrically arranged and can hold the rotor, and when the two magnetizing poles move relative to each other, they can push the positioning sleeve and the rotor to rotate simultaneously, so that the center line of the rotor's pole coincides with the center line of the magnetizing pole; When the brushless motor rotor is magnetized, the rotor needs to be manually clamped, and after clamping, it is covered with a magnetizer and energized for magnetization. It needs to be manually taken out and then rotated and shifted, and then energized for magnetization to ensure the uniformity of magnetization. Many operating procedures affect its magnetization efficiency. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a brushless motor rotor magnetizing device and method, which achieves the purpose of solving the above-mentioned problems.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: a brushless motor rotor magnetizing device, comprising a base, an electric lifting rod is fixedly connected to the top of the base, a lifting plate is fixedly connected to the top of the electric lifting rod, a magnetizer is arranged at the bottom of the lifting plate, a motor rotor is arranged below the magnetizer, and a magnetizing clamping mechanism is arranged at the top of the base; The magnetizing clamping mechanism comprises: The disc is a circular disc-shaped structure, the disc is rotatably connected to the top of the base, the inner wall of the disc is rotatably connected to a fixed block, the bottom of the fixed block is fixedly connected to the top of the base, the top of the fixed block is fixedly connected to a threaded rod, and the disc is used to rotate the motor rotor placed thereon; A sliding clamping block, the sliding clamping block is a block structure, one side of the sliding clamping block is an inclined surface, the bottom of the sliding clamping block is slidably connected to the top of the disc through a slide groove, one side of the sliding clamping block is fixedly connected with a hinge block A, and the sliding clamping block is used to slide on the disc when being pressed down by the motor rotor.

[0005] Preferably, a telescopic hinge rod is hinged on the inner wall of the hinge block A, the telescopic hinge rod is hinged on the hinge block B, and one side of the hinge block B is fixedly connected with an internal threaded sleeve.

[0006] Preferably, the internally threaded sleeve is an annular sleeve structure, the inner wall of the internally threaded sleeve is threadedly connected to the outer wall of the threaded rod, and a counterweight is fixedly connected to the bottom of the internally threaded sleeve.

[0007] Preferably, the inner wall of the counterweight block does not contact the outer wall of the threaded rod, and a slot is provided on the inner wall of the motor rotor, and the width of the slot is equal to the width of the sliding clamping block.

[0008] Preferably, the telescopic hinge rod is fixedly connected to a fixing plate A near the outer wall of the hinge block B, the telescopic hinge rod is fixedly connected to a fixing plate B near the outer wall of the hinge block A, and a spring is fixedly connected between the fixing plates A and B.

[0009] Preferably, a slow rotation mechanism is provided at the top of the internal threaded sleeve, and the slow rotation mechanism includes a vertical plate A, the bottom of the vertical plate A is fixedly connected to the top of the internal threaded sleeve, the outer wall of the vertical plate A is slidably connected to a sliding plate, the inner wall of the sliding plate is slidably connected to a vertical plate B, the top of the vertical plate B is fixedly connected to a fixed sleeve, and the inner wall of the fixed sleeve is rotatably connected to the outer wall of the threaded rod through a bearing.

[0010] Preferably, a one-way air inlet valve and a one-way air outlet valve are provided on the outer wall of the sliding plate, and the interior of the sliding plate is connected to the outside through the one-way air inlet valve and the one-way air outlet valve.

[0011] A brushless motor rotor magnetization method comprises the following steps: Step 1: Place the motor rotor that needs to be magnetized on the disc on the base. When the motor rotor is placed on the disc, the slot on the inner wall of the motor rotor is just stuck on the sliding clamping block of the corresponding width and pressed against it; Step 2: Press the motor rotor against the inclined surface on one side of the sliding clamping block by pressing. When the inclined surface on one side of the sliding clamping block is subjected to a downward force, a component force is applied in the direction of the threaded rod, so that the sliding clamping block slides on the disc through the slide groove between the disc and the disc to approach the threaded rod; Step 3: As the sliding clamping block slides, the sliding clamping block is completely retracted into the interior of the motor rotor, and the elastic force of the spring is used to make the sliding clamping block tightly press against the inner wall of the motor rotor to complete the clamping. Then, the lifting plate driven by the electric lifting rod is started to descend, and the motor rotor is inserted into it by using the magnetizer. The motor rotor is energized and magnetized by starting the magnetizer.

[0012] The present invention provides a brushless motor rotor magnetization device and method, which have the following beneficial effects: 1. The present invention sets a magnetizing clamping mechanism, and uses the elastic force of the spring to push the telescopic hinge rod, the hinge block A and the sliding clamping block to be tightly clamped in the slot, and uses the extrusion force to tightly squeeze the inner wall of the motor rotor, thereby completing the automatic clamping of the motor rotor, avoiding the problem of uneven magnetization caused by the position of the motor rotor not being fixed when the magnetizer is pressed down and energized, and improving the magnetization efficiency of the motor rotor through this quick fixing method.

[0013] 2. The present invention sets a slow-speed rotation mechanism, which rotates through thread sliding, thereby causing the hinge block B, the telescopic hinge rod and the hinge block A to start rotating together. Since the threaded rod is fixed by the fixed block below, the threaded rod cannot rotate. Therefore, when the internal threaded sleeve is pushed to slide up on the threaded rod, the internal threaded sleeve itself, the hinge block B, the telescopic hinge rod, the hinge block A and the sliding clamping block will all start to rotate synchronously, and the sliding clamping block drives the disc to rotate synchronously, thereby completing the insertion of the motor rotor into the sliding clamping block through the slot, so that after the motor rotor is fixed on the disc and the subsequent magnetization process is carried out, the disc, the sliding clamping block and the motor rotor can keep rotating all the time, so that when magnetizing in the magnetizer, there is no need to manually adjust the position to achieve a uniform rotation magnetization effect.

[0014] 3. The present invention sets a magnetizing clamping mechanism. When the internal threaded sleeve slides and rises on the outer wall of the threaded rod, since the threaded rod is located at the center of the disk and the internal threaded sleeve is connected to four telescopic hinged rods through the hinge block B, when the internal threaded sleeve rises, the hinge block B and the telescopic hinged rod will pull the four hinged blocks A and the sliding clamping block to move synchronously, so that the moving distances of the four sliding clamping blocks are equal, and the motor rotor located on the four sliding clamping blocks can automatically maintain the centering effect of the concentric circle position with the disk, avoiding the problem of uneven magnetization around the motor rotor during subsequent magnetization by the magnetizer.

[0015] 4. The present invention sets a magnetizing clamping mechanism. After the magnetization is completed, the elastic force of the spring continues to be released, which will still make the internal thread sleeve slide and rise on the outer wall of the threaded rod, so that the motor rotor as a whole is driven to rotate by the sliding clamping block and the slot, and then through its long-term stable and slow rotation, it is convenient for the subsequent circumferential magnetic detection of the motor rotor, and also frees the hands of the staff to improve the magnetization of the motor rotor and the overall work efficiency of subsequent work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 The structure diagram of the magnetizing clamping mechanism of the present invention is shown in FIG. Figure 1 ; Figure 3 The structure diagram of the magnetizing clamping mechanism of the present invention is shown in FIG. Figure 2 ; Figure 4 The structure diagram of the magnetizing clamping mechanism of the present invention is shown in FIG. Figure 3 ; Figure 5 For the present invention Figure 2 A magnified image of point A; Figure 6 The structure diagram of the magnetizing clamping mechanism of the present invention is shown in FIG. Figure 4 ; Figure 7 The motion state of the magnetizing clamping mechanism of the present invention is Figure 1 ; Figure 8 The motion state of the magnetizing clamping mechanism of the present invention is Figure 2 ; Fig. 9 The motion state of the magnetizing clamping mechanism of the present invention is Figure 3 ; Fig.10 The motion state of the magnetizing clamping mechanism of the present invention is Figure 4 ; Fig.11 The structure diagram of the slow-speed rotating mechanism of the present invention is shown in FIG. Figure 1 ; Fig.12 It is a schematic diagram of the disassembled structure of the slow-speed rotating mechanism of the present invention; Fig.13 For the present invention Figure 2 The enlarged view of point B; Fig.14 The structure diagram of the slow-speed rotating mechanism of the present invention is shown in FIG. Figure 2 ; Fig.15 The motion state of the slow-speed rotating mechanism of the present invention is Figure 1 ; Fig.16The motion state of the slow-speed rotating mechanism of the present invention is Figure 2 ; Fig.17 The motion state of the slow-speed rotating mechanism of the present invention is Figure 3 ; Fig.18 The motion state of the slow-speed rotating mechanism of the present invention is Figure 4 .

[0017] In the figure: 1 lifting plate, 2 motor rotor, 3 magnetizing clamping mechanism, 301 disc, 302 sliding clamping block, 303 slot, 304 hinge block A, 305 counterweight, 306 telescopic hinge rod, 307 hinge block B, 308 internal thread sleeve, 309 threaded rod, 310 fixed block, 311 fixed plate A, 312 spring, 313 fixed plate B, 4 slow rotation mechanism, 401 vertical plate A, 402 sliding plate, 403 vertical plate B, 405 fixed sleeve, 406 one-way air inlet valve, 407 one-way air outlet valve, 5 electric lifting rod, 6 magnetizer, 7 base. DETAILED DESCRIPTION

[0018] Example 1: Please refer to Figure 1-4 The present invention provides a technical solution: a brushless motor rotor magnetizing device, comprising a base 7, an electric lifting rod 5 is fixedly connected to the top of the base 7, a lifting plate 1 is fixedly connected to the top of the electric lifting rod 5, a magnetizer 6 is arranged at the bottom of the lifting plate 1, a motor rotor 2 is arranged below the magnetizer 6, and a magnetizing clamping mechanism 3 is arranged at the top of the base 7; The magnetizing clamping mechanism 3 comprises: The disk 301 is a circular disk-shaped structure. The disk 301 is rotatably connected to the top of the base 7. The inner wall of the disk 301 is rotatably connected to a fixed block 310. The bottom of the fixed block 310 is fixedly connected to the top of the base 7. The top of the fixed block 310 is fixedly connected to a threaded rod 309. The disk 301 is used to rotate the motor rotor 2 placed thereon; The sliding clamping block 302 is a block structure, one side of the sliding clamping block 302 is an inclined surface, the bottom of the sliding clamping block 302 is slidably connected to the top of the disc 301 through a slide groove, and one side of the sliding clamping block 302 is fixedly connected with a hinge block A304. The sliding clamping block 302 is used to slide on the disc 301 when being pressed down by the motor rotor 2.

[0019] When in use, the motor rotor 2 to be magnetized is placed on the disc 301 on the base 7, and then the electric lifting rod 5 is started to drive the lifting plate 1 to descend, and the motor rotor 2 is inserted into the magnetizer 6, and the motor rotor 2 is powered on and magnetized by starting the magnetizer 6; Example 2: Please refer to Figure 1-10On the basis of the first embodiment, the present invention provides a technical solution: a telescopic hinge rod 306 is hinged on the inner wall of the hinge block A304, the telescopic hinge rod 306 is hinged on the hinge block B307, and an internal threaded sleeve 308 is fixedly connected to one side of the hinge block B307.

[0020] The internal threaded sleeve 308 is an annular sleeve structure, the inner wall of the internal threaded sleeve 308 is threadedly connected to the outer wall of the threaded rod 309 , and the bottom of the internal threaded sleeve 308 is fixedly connected to a counterweight block 305 .

[0021] The inner wall of the counterweight block 305 does not contact the outer wall of the threaded rod 309 . A slot 303 is provided on the inner wall of the motor rotor 2 . The width of the slot 303 is equal to the width of the sliding clamping block 302 .

[0022] The telescopic hinge rod 306 is fixedly connected to a fixing plate A311 on the outer wall near the hinge block B307, the telescopic hinge rod 306 is fixedly connected to a fixing plate B313 on the outer wall near the hinge block A304, and a spring 312 is fixedly connected between the fixing plate A311 and the fixing plate B313.

[0023] When the motor rotor 2 is placed on the disc 301, the slot 303 on the inner wall of the motor rotor 2 is just stuck on the sliding clamping block 302 of the corresponding width, and presses against the inclined surface on one side of the sliding clamping block 302, and the motor rotor 2 is pressed on the inclined surface on one side of the sliding clamping block 302 by pressing. The inclined surface on one side of the sliding clamping block 302 is subjected to a downward force, which will apply a component force in the direction of the threaded rod 309, so that the sliding clamping block 302 slides on the disc 301 through the slide groove between the disc 301 and the disc 301 to approach the threaded rod 309; When the four sliding clamping blocks 302 slide toward the central threaded rod 309 and the center position of the disk 301, the sliding clamping block 302 will push the telescopic hinge rod 306 through the hinge block A304, and the telescopic hinge rod 306 will push the hinge block B307 to the internal threaded sleeve 308 through the built-in spring of the inner wall. At this time, the internal threaded sleeve 308 cannot be pushed, so that the telescopic hinge rod 306 will begin to shrink and squeeze the spring 312 between the fixed plate A311 and the fixed plate B313 on the telescopic hinge rod 306 to deform until the motor rotor 2 continues to move downward. The pressing crosses the inclined surface of the sliding clamping block 302 to the vertical surface on one side of the sliding clamping block 302, so that the elastic force of the spring 312 pushes the telescopic hinge rod 306, the hinge block A304 and the sliding clamping block 302 to be tightly clamped in the clamping groove 303, and the inner wall of the motor rotor 2 is tightly squeezed by the squeezing force, so as to complete the automatic clamping of the motor rotor 2, avoid the problem of uneven magnetization caused by the position of the motor rotor 2 not being fixed when the magnetizer 6 is pressed down and energized, and improve the magnetization efficiency of the motor rotor 2 through this quick fixing method; Example 3: Please refer to Figure 1-18On the basis of the first and second embodiments, the present invention provides a technical solution: a slow-rotation mechanism 4 is arranged on the top of the internal threaded sleeve 308, and the slow-rotation mechanism 4 includes a vertical plate A401, the bottom of the vertical plate A401 is fixedly connected to the top of the internal threaded sleeve 308, the outer wall of the vertical plate A401 is slidably connected to a sliding plate 402, the inner wall of the sliding plate 402 is slidably connected to a vertical plate B403, the top of the vertical plate B403 is fixedly connected to a fixed sleeve 405, and the inner wall of the fixed sleeve 405 is rotatably connected to the outer wall of the threaded rod 309 through a bearing.

[0024] A one-way air inlet valve 406 and a one-way air outlet valve 407 are provided on the outer wall of the sliding plate 402 , and the interior of the sliding plate 402 is connected to the outside through the one-way air inlet valve 406 and the one-way air outlet valve 407 .

[0025] When the telescopic hinge rod 306 pushes the internal threaded sleeve 308, the internal threaded sleeve 308 rises by pushing the upper vertical plate A401, the sliding plate 402, and the vertical plate B403 to contract each other. When they contract each other, air will be discharged through the one-way air outlet valve 407. The one-way air outlet valve 407 has a small diameter, so the discharge speed is limited. Then, when the hinge block B307 pushes the internal threaded sleeve 308, the internal threaded sleeve 308 will rise and rotate on the outer wall of the threaded rod 309, and the rising speed of the internal threaded sleeve 308 will be greatly slowed down. Since the thread rise angle of the thread on the outer wall of the threaded rod 309 and the inner wall of the internal threaded sleeve 308 is greater than 45 degrees, the friction of the thread sliding is low, and the internal threaded sleeve 308 can slide smoothly on the threaded rod 309, rise and rotate; Only by continuously and slowly exhausting the air outward through the one-way air outlet valve 407 can the vertical plate A401, the sliding plate 402, and the vertical plate B403 be continuously shortened, and when the vertical plate A401, the sliding plate 402, and the vertical plate B403 are stretched away from each other, air is taken in through the one-way air inlet valve 406. The one-way air inlet valve 406 has a large opening and is not blocked, while the one-way air outlet valve 407 has a small opening. Therefore, when the vertical plate A401, the sliding plate 402, and the vertical plate B403 are squeezed against each other, the air outlet is limited, and the one-way air inlet valve 406 and the one-way air outlet valve 407 are both one-way air inlet channels, and the air cannot be diverted; After the motor rotor 2 is quickly inserted into the four sliding clamping blocks 302, the spring 312 is released by its own elastic force, continuously pushing the internal threaded sleeve 308 to slowly rise on the threaded rod 309, and rotating through the thread sliding, thereby causing the hinge block B307, the telescopic hinge rod 306 and the hinge block A304 to start rotating together. Since the threaded rod 309 is fixed by the fixing block 310 below, the threaded rod 309 cannot rotate. Therefore, when the internal threaded sleeve 308 is pushed to slide and rise on the threaded rod 309, the internal threaded sleeve 308 itself and The hinge block B307, the telescopic hinge rod 306, the hinge block A304, and the sliding clamping block 302 will all start to rotate synchronously, and the sliding clamping block 302 drives the disc 301 to rotate synchronously, so as to complete the insertion of the motor rotor 2 into the sliding clamping block 302 through the card slot 303, so that after the motor rotor 2 is fixed on the disc 301 and the subsequent magnetization process is carried out, the disc 301 and the sliding clamping block 302 and the motor rotor 2 can keep rotating all the time, so that when magnetizing in the magnetizer 6, there is no need to manually adjust the position, so as to achieve a uniform rotation magnetization effect; When the internal threaded sleeve 308 slides up on the outer wall of the threaded rod 309, since the threaded rod 309 is located at the center of the disk 301, and the internal threaded sleeve 308 is connected to the four telescopic hinged rods 306 through the hinge block B307, when the internal threaded sleeve 308 rises, it will synchronously pull the four hinged blocks A304 and the sliding clamping block 302 to move synchronously through the hinge block B307 and the telescopic hinged rod 306, so that the moving distances of the four sliding clamping blocks 302 are equal, and the motor rotor 2 located on the four sliding clamping blocks 302 can automatically maintain the concentric circle position with the disk 301. The problem of uneven magnetization around the motor rotor 2 during subsequent magnetization by the magnetizer 6 is avoided; After the magnetization is completed, the elastic force of the spring 312 continues to be released, which will still cause the internal threaded sleeve 308 to slide and rise on the outer wall of the threaded rod 309, so that the motor rotor 2 as a whole is driven to rotate by the sliding clamping block 302 and the slot 303, and then through its long-term stable and slow rotation, it is convenient for the subsequent circumferential magnetic detection of the motor rotor 2, and also frees the hands of the staff to improve the magnetization of the motor rotor 2 and the overall work efficiency of subsequent work.

[0026] After the magnetization is completed and the motor rotor 2 is picked up, the internal threaded sleeve 308 starts to slide down on the outer wall of the threaded rod 309 along with the counterweight of the bottom counterweight block 305, and the telescopic hinge rod 306, the hinge block A304 and the sliding clamping block 302 are pushed back to their original positions by the hinge block B307, so that they are returned to their original positions together, waiting for the next pressing and clamping work of the motor rotor 2; A brushless motor rotor magnetization method comprises the following steps: Step 1: Place the motor rotor 2 to be magnetized on the disc 301 on the base 7. When the motor rotor 2 is placed on the disc 301, the slot 303 on the inner wall of the motor rotor 2 is just stuck on the sliding clamping block 302 of the corresponding width and pressed against it; Step 2: Press the motor rotor 2 against the inclined surface of the sliding clamping block 302 by pressing. When the inclined surface of the sliding clamping block 302 is subjected to a downward force, a component force is applied to the direction of the threaded rod 309, so that the sliding clamping block 302 slides on the disc 301 through the slide groove between the disc 301 and the disc 301 to approach the threaded rod 309. Step 3: As the sliding clamping block 302 slides, the sliding clamping block 302 is completely retracted into the interior of the motor rotor 2, and the elastic force of the spring 312 is used to make the sliding clamping block 302 tightly press against the inner wall of the motor rotor 2 to complete the clamping, and then the lifting plate 1 driven by the electric lifting rod 5 is started to descend, and the motor rotor 2 is inserted into it by using the magnetizer 6, and the motor rotor 2 is energized and magnetized by starting the magnetizer 6.

[0027] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A brushless motor rotor magnetizing device, comprising a base (7), the top of the base (7) being fixedly connected to an electric lifting rod (5), the top of the electric lifting rod (5) being fixedly connected to a lifting plate (1), the bottom of the lifting plate (1) being provided with a magnetizer (6), and a motor rotor (2) being provided below the magnetizer (6), characterized in that: A magnetizing clamping mechanism (3) is provided on the top of the base (7); The magnetizing clamping mechanism (3) comprises: A disc (301), the disc (301) being a circular disc-shaped structure, the disc (301) being rotatably connected to the top of the base (7), the inner wall of the disc (301) being rotatably connected to a fixing block (310), the bottom of the fixing block (310) being fixedly connected to the top of the base (7), the top of the fixing block (310) being fixedly connected to a threaded rod (309), the disc (301) being used to rotate a motor rotor (2) placed thereon; A sliding clamping block (302) is a block-shaped structure, one side of the sliding clamping block (302) is an inclined surface, the bottom of the sliding clamping block (302) is slidably connected to the top of the disc (301) via a sliding groove, one side of the sliding clamping block (302) is fixedly connected to a hinge block A (304), and the sliding clamping block (302) is used to slide on the disc (301) when being pressed down by the motor rotor (2).

2. A brushless motor rotor magnetizing device according to claim 1, characterized in that: A telescopic hinge rod (306) is hinged on the inner wall of the hinge block A (304), the telescopic hinge rod (306) is hinged on the hinge block B (307), and one side of the hinge block B (307) is fixedly connected to an internal thread sleeve (308).

3. A brushless motor rotor magnetizing device according to claim 2, characterized in that: The internally threaded sleeve (308) is an annular sleeve structure; the inner wall of the internally threaded sleeve (308) is threadedly connected to the outer wall of the threaded rod (309); and a counterweight (305) is fixedly connected to the bottom of the internally threaded sleeve (308).

4. A brushless motor rotor magnetizing device according to claim 3, characterized in that: The inner wall of the counterweight block (305) does not contact the outer wall of the threaded rod (309); a slot (303) is provided on the inner wall of the motor rotor (2); and the width of the slot (303) is equal to the width of the sliding clamping block (302).

5. A brushless motor rotor magnetizing device according to claim 4, characterized in that: The telescopic hinge rod (306) is fixedly connected to a fixing plate A (311) on an outer wall close to the hinge block B (307), the telescopic hinge rod (306) is fixedly connected to a fixing plate B (313) on an outer wall close to the hinge block A (304), and a spring (312) is fixedly connected between the fixing plate A (311) and the fixing plate B (313).

6. A brushless motor rotor magnetizing device according to claim 5, characterized in that: A slow-rotation mechanism (4) is arranged at the top of the internal threaded sleeve (308), and the slow-rotation mechanism (4) comprises a vertical plate A (401), the bottom of the vertical plate A (401) is fixedly connected to the top of the internal threaded sleeve (308), the outer wall of the vertical plate A (401) is slidably connected to a sliding plate (402), the inner wall of the sliding plate (402) is slidably connected to a vertical plate B (403), the top of the vertical plate B (403) is fixedly connected to a fixed sleeve (405), and the inner wall of the fixed sleeve (405) is rotatably connected to the outer wall of the threaded rod (309) via a bearing.

7. A brushless motor rotor magnetizing device according to claim 6, characterized in that: A one-way air inlet valve (406) and a one-way air outlet valve (407) are provided on the outer wall of the sliding plate (402), and the interior of the sliding plate (402) is connected to the outside through the one-way air inlet valve (406) and the one-way air outlet valve (407).

8. A brushless motor rotor magnetizing method, based on a brushless motor rotor magnetizing device according to any one of claims 1 to 7, characterized in that: The following steps are involved: The first step is to place the motor rotor (2) to be magnetized on the disc (301) on the base (7). When the motor rotor (2) is placed on the disc (301), the slot (303) on the inner wall of the motor rotor (2) is just stuck on the sliding clamping block (302) of the corresponding width and pressed against it; Step 2: The motor rotor (2) is pressed against the inclined surface on one side of the sliding clamping block (302) by pressing. When the inclined surface on one side of the sliding clamping block (302) is subjected to a downward force, a component force is applied in the direction of the threaded rod (309), so that the sliding clamping block (302) slides on the disc (301) through the slide groove between the disc (301) and the disc (301) to approach the threaded rod (309); Step 3: As the sliding clamping block (302) slides, the sliding clamping block (302) is completely retracted into the interior of the motor rotor (2), and the elastic force of the spring (312) is used to make the sliding clamping block (302) tightly press against the inner wall of the motor rotor (2) to complete the clamping. Then, the lifting plate (1) driven by the electric lifting rod (5) is started to descend, and the motor rotor (2) is inserted into the magnetizer (6). The motor rotor (2) is energized and magnetized by starting the magnetizer (6).

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