Embedded magnetic steel assembly structure of large permanent magnet motor

Abstract

The utility model discloses an embedded magnetic steel assembly structure of a large permanent magnet motor, which comprises a rotor bracket, rotor iron cores are distributed on the periphery of an outer cylinder of the rotor bracket, an annular rotor pressure plate is arranged at a non-shaft extension end of the rotor bracket, and a bearing and an end cover are arranged at the non-shaft extension end of the rotor bracket and are arranged in a base. The shaft extension end guides the magnetic steel into the magnetic steel groove through the magnetic steel guide device, the magnetic steel guide device comprises false magnetic steel and a guide sleeve, the size of the false magnetic steel is consistent with that of the magnetic steel, the end of the false magnetic steel is provided with a push rod, a guide sleeve guide groove, a guide part and a clamping part, and the clamping part can be clamped on the two sides of the magnetic steel groove; and the magnetic steel is guided into the magnetic steel groove through the guide groove. According to the utility model, the installation direction of the magnetic steel is guided through the guide sleeve, the operation difficulty and the material loss are reduced, the personal safety of assembly workers can be ensured, the production efficiency is improved, and the production cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of motor assembly technology, and specifically relates to an embedded magnet assembly structure for a large permanent magnet motor. Background Technology

[0002] With societal development, automation levels across industries are increasing, leading to a wider application of electric motors and consequently, more stringent requirements for them. As electric motors evolve towards higher torque, the demands on the securing of magnets in the rotor also rise. The main methods for mounting magnets in electric motor rotors are surface-mounted and internal. Surface-mounted magnets directly face the air gap, offering advantages in processing and installation, but they directly bear the demagnetizing effect of armature reaction. Internal magnets are placed inside the core, resulting in more complex processing and installation, and higher magnetic leakage, but allowing for the placement of more magnets to improve air gap magnetic flux density and reduce the motor's mass and size. From a structural safety perspective, internal magnets are more secure, as they are less prone to detachment.

[0003] In internal rotor magnetic pole type (permanent magnets embedded in the magnetic poles) permanent magnet motors, the magnets themselves have magnetic force. Especially for high-performance magnets, the gap between the magnets and the slots is only 0.2mm to 0.4mm. It is very difficult to install them into the magnetic slots (embedded type, the gap between the magnet and the slot) and it is easy to cause the magnets to collide violently and fly out, damaging the magnets and the surface coating, causing injury to assembly workers. Utility Model Content

[0004] To address the above issues and improve the operability and precision of the embedded permanent magnet motor rotor assembly to meet the requirements of mass production, this utility model provides a large permanent magnet motor embedded magnet assembly structure.

[0005] This utility model is achieved using the following technical solution: A large permanent magnet motor embedded magnet assembly structure includes a rotor support. A rotor core is arranged around the outer cylinder of the rotor support. The rotor core is fan-shaped, and its sides have rectangular tensioning screw grooves and magnet grooves penetrating near the inner and outer diameter sides, respectively. A fixing hole penetrating the tensioning screw groove is provided on the inner diameter side. The tensioning screw includes a screw body with a rectangular cross-section and screw holes. Both ends of the screw body are screw sections. The screw body passes through the tensioning screw groove. The tensioning screw is tightened by fastening bolts provided on the inner side of the rotor support's outer cylinder, which pass through the fixing hole. An annular rotor pressure plate is installed on the non-shaft extension end of the rotor support. A through-hole is provided around the rotor pressure plate. The hole is secured to the rotor support by screwing the bolt section with a fastening nut. The non-shaft extension end of the rotor support is equipped with a bearing and end cover and installed in the base. The shaft extension end guides the magnet into the magnet slot through a magnet guide device. The magnet guide device includes a dummy magnet and a guide sleeve. The dummy magnet has the same size as the magnet and has a push rod at its end. The guide sleeve has a guide groove formed by a base plate, two parallel side plates on the base plate, and a panel connecting the two side plates. The upper end of the base plate extends to the upper end of the side plates to form a guide part, and the lower end of the side plates extends to the outside of the base plate to form a snap-fit ​​part. The snap-fit ​​part can be snapped into both sides of the magnet slot. After the dummy magnet passes through the slot in the magnet slot, the magnet is guided into the magnet slot through the guide groove.

[0006] Furthermore, thread-locking adhesive is applied to the fastening bolts during assembly.

[0007] Furthermore, the surface of the magnet is coated with epoxy, magnetized in parallel, and the polarity is marked on the surface.

[0008] Furthermore, the fake magnet and push rod are made of epoxy resin.

[0009] Furthermore, the guide sleeve is made of non-magnetic material.

[0010] Furthermore, the rotor pressure plate is made of stainless steel, and the rotor pressure plate and the rotor support are fitted together by a stop.

[0011] This utility model has the following beneficial effects:

[0012] 1. This utility model is easy to operate and has a simple structure. It can prevent the magnets from shifting or unevenly distributing during assembly. It adopts multiple positioning devices such as pressure plates and guide sleeves, and the assembly accuracy can be controlled within 0.05mm.

[0013] 2. This utility model combines safety and convenience. By guiding the installation direction of the magnet with a guide sleeve, the operation difficulty and material consumption are reduced. This magnet assembly process can avoid damage to the magnet and its surface coating caused by the strong magnetic force of the magnet, ensure the personal safety of assembly workers, improve production efficiency, and reduce production costs. Attached Figure Description

[0014] Figure 1 This is a front view of the rotor of this utility model;

[0015] Figure 2 This is a side view of the rotor of this utility model;

[0016] Figure 3 This is a schematic diagram of the rotor assembly of this utility model;

[0017] Figure 4 This is a schematic diagram of the rotor core of this utility model;

[0018] Figure 5 This is a schematic diagram of the tensioning screw of this utility model;

[0019] Figure 6 This is a schematic diagram of the rotor pressure plate of this utility model;

[0020] Figure 7 This is a schematic diagram of the structure of the dummy magnet of this utility model;

[0021] Figure 8 This is a schematic diagram of the structure of the guide sleeve of this utility model.

[0022] In the diagram: 1-Rotor support; 2-Rotor pressure plate; 3-Tightening screw; 31-Screw body; 32-Screw section; 4-Fastening nut; 5-Rotor core; 51-Tightening screw groove; 52-Magnet groove; 53-Fixing hole; 54-Magnetic bridge; 6-Magnet; 7-Fastening bolt; 8-Base; 9-Guide sleeve; 91-Guide groove; 92-Guide part; 93-Snap-fit ​​part; 10-Dummy magnet; 11-Push rod. Detailed Implementation

[0023] To better understand the purpose, structure, and function of this utility model, the following description, in conjunction with the accompanying drawings, provides a more detailed account of a large permanent magnet motor embedded magnet assembly structure of this utility model.

[0024] like Figures 1-8As shown, a large permanent magnet motor with an embedded magnet assembly structure includes a rotor support 1. A rotor core 5 is arranged around the outer cylinder of the rotor support 1. The rotor core 5 is fan-shaped, with rectangular tension screw grooves 51 and magnet grooves 52 extending through its sides near the inner and outer diameters, respectively. A fixing hole 53 extending through the tension screw groove 51 is provided on the inner diameter side. The tension screw 3 includes a screw body 31 with a rectangular cross-section and screw holes. Both ends of the screw body 31 are screw sections 32. The screw body 31 passes through the tension screw groove 51, and the tension screw 3 is tightened by fastening bolts 4 provided on the inner side of the rotor support 1 through the fixing holes 53. An annular rotor pressure plate 2 is installed on the non-shaft extension end of the rotor support 1. The rotor pressure plate 2 has through holes around its circumference, and fastening nuts 4 are used to tighten the tension screw 3. The screw section 32 is fastened to the rotor support 1. The non-shaft extension end of the rotor support 1 is fitted with a bearing and end cover and installed in the base 8. The shaft extension end guides the magnet into the magnet groove 52 through a magnet guide device. The magnet guide device includes a dummy magnet 10 and a guide sleeve 9. The dummy magnet 10 has the same size as the magnet 6 and is equipped with a push rod 11 at its end. The guide sleeve 9 has a guide groove 91 formed by a base plate, two parallel side plates on the base plate, and a panel connecting the two side plates. The upper end of the base plate extends to the upper end of the side plates to form a guide part 92. The lower end of the side plates extends to the outside of the base plate to form a snap-fit ​​part 93. The snap-fit ​​part 93 can be snapped into both sides of the magnet groove 52. After the dummy magnet 10 passes through the slot in the magnet groove 52, the magnet 6 is guided into the magnet groove 52 through the guide groove 91.

[0025] The embedded magnet assembly structure of this utility model fixes the rotor core 5 to the rotor bracket 1 by tightening screw 3, installs the rotor pressure plate 2, bearing and end cover at the non-shaft extension end, and inserts the rotor without magnets 6 into the base 8. A guide sleeve 9 is installed in the magnet slot 52 of the rotor core 5 at the shaft extension end. After the dummy magnet 10 is pushed into the magnet slot 52 of the rotor core 5 through the slot using push rod 11, the magnets 6 are pushed into the rotor core 5 one by one in sequence. Then the rotor pressure plate 2 on the other side is installed to press the magnets 6, thereby completing the assembly.

[0026] In this embodiment, through holes are evenly arranged on the surface of the rotor support 1 cylinder, and threaded through holes are evenly distributed on the screw body of the tensioning screw 3. The rotor core 5 is formed by pressing rotor laminations, and a tensioning screw groove 51 is formed in the middle for passing through the tensioning screw 3. A fixing hole 53 is formed at the bottom for fixing with fastening bolts 7. The rotor core 5 is fixed to the rotor support 1 by fastening bolts 7 through the tensioning screw 3. Thread fastening adhesive is brushed onto the fastening bolts 7 during assembly.

[0027] The rotor pressure plate 2 is made of stainless steel and is fitted to the rotor support 1 via a stop. The dummy magnet 10 and push rod 11 are made of epoxy resin, and the guide sleeve 9 is made of non-magnetic material and is fixed to the rotor core 5 by a magnetic isolation bridge 54. The magnet 6 is epoxy coated, parallel magnetized, and its polarity is marked on the surface.

[0028] During assembly, first, install the tensioning screw 3 and rotor core 5 on the rotor bracket 1, apply bolt fastening adhesive to the fastening bolts 7, and then tighten the bolts. Fix the rotor pressure plate 2 at the non-shaft extension end, leaving the other end open for the installation of magnets 6. After pre-grooving each magnet slot 52 with dummy magnets 10, clean the dust on the rotor with a vacuum cleaner.

[0029] Then, install the non-shaft extension bearing and end cover, place the rotor without magnet 6 into the machine base 8, insert the guide sleeve 9 into the magnetic isolation bridge 54 on the rotor core 5 at the shaft extension end, and align the guide groove 91 with the groove of the magnet groove 52.

[0030] According to the process requirements for magnetic polarity, the first magnet 6 is placed in the guide groove 91. Using the push rod 11, magnet 6 is pushed sequentially through the guide groove 91 into the magnet slot 52. The remaining magnets 6 are then pushed into the magnet slots 52 in sequence, ensuring the magnets 6 in the slots 52 are connected end-to-end. After all magnets 6 are installed, the guide sleeve 9 is removed, the rotor pressure plate 2 at the shaft extension end is installed, and tightened with the fastening nut 4. With the magnet assembly complete, other accessories are then installed to complete the assembly.

[0031] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A large permanent magnet motor embedded magnet assembly structure, characterized in that, The rotor bracket (1) is equipped with a rotor core (5) arranged around its outer cylinder. The rotor core (5) is fan-shaped, and its sides are respectively provided with a rectangular tensioning screw groove (51) and a magnet groove (52) that pass through the inner diameter side and the outer diameter side. The inner diameter side is provided with a fixing hole (53) that passes through the tensioning screw groove (51). The tensioning screw (3) includes a screw body (31) with a rectangular cross section and a screw hole. The two ends of the screw body (31) are screw sections (32). The screw body (31) is inserted into the tensioning screw groove (51). The tensioning screw (3) is screwed and tightened by fastening bolts (7) provided on the inner side of the outer cylinder of the rotor bracket (1) through the fixing hole (53). The non-shaft extension end of the rotor bracket (1) is equipped with an annular rotor pressure plate (2). The rotor pressure plate (2) is provided with a through hole around its circumference. The screw section (32) is screwed and tightened by fastening nuts (4). The rotor is fixed on the rotor support (1). The non-shaft extension end of the rotor support (1) is equipped with a bearing and an end cover and installed in the base (8). The shaft extension end guides the magnet (6) into the magnet groove (52) through the magnet guide device. The magnet guide device includes a dummy magnet (10) and a guide sleeve (9). The dummy magnet (10) has the same size as the magnet (6) and its end is provided with a push rod (11). The guide sleeve (9) has a guide groove (91) formed by a base plate, two side plates arranged in parallel on the base plate and a panel connecting the two side plates. The upper end of the base plate extends to the upper end of the side plate to form a guide part (92). The lower end of the side plate extends to the outside of the base plate to form a snap-fit ​​part (93). The snap-fit ​​part (93) can be snapped into both sides of the magnet groove (52). After the dummy magnet (10) passes through the slot in the magnet groove (52), the magnet (6) is guided into the magnet groove (52) through the guide groove (91).

2. The large permanent magnet motor embedded magnet assembly structure according to claim 1, characterized in that, Apply thread-locking adhesive to the fastening bolts (7) during assembly.

3. The large permanent magnet motor embedded magnet assembly structure according to claim 1, characterized in that, The surface of the magnet (6) is coated with epoxy, magnetized in parallel, and the polarity is marked on the surface.

4. The large permanent magnet motor embedded magnet assembly structure according to claim 1, characterized in that, The dummy magnet (10) and push rod (11) are made of epoxy resin.

5. The large permanent magnet motor embedded magnet assembly structure according to claim 1, characterized in that, The guide sleeve (9) is made of non-magnetic material.

6. The large permanent magnet motor embedded magnet assembly structure according to any one of claims 1 to 5, characterized in that, The rotor pressure plate (2) is made of stainless steel and is fitted with the rotor support (1) through a stop.

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