Magnetic steel pressing device for rotor core of permanent magnet motor

Abstract

The utility model discloses a permanent magnet motor rotor core magnetic steel pressing device which comprises a rotor core and magnetic steel and further comprises a cylinder, an upper pressing plate and a lower supporting plate, the rotor core is arranged in an inner cavity of the cylinder, and a plurality of positioning rib plates which extend in the radial direction and are evenly distributed in the circumferential direction are arranged on the inner wall of the cylinder. A tile-shaped cavity is defined by the cylinder, the rotor core and the two adjacent positioning rib plates, the upper pressing plate and the lower supporting plate are in a disc shape, an upper positioning cylinder is arranged in the middle of the bottom face of the upper pressing plate, a plurality of evenly-distributed tile-shaped through holes are formed in the circumferential direction of the upper pressing plate, a lower positioning cylinder is arranged in the middle of the top face of the lower supporting plate, and a plurality of evenly-distributed tile-shaped through holes are formed in the circumferential direction of the lower pressing plate. The upper positioning cylinder and the lower positioning cylinder are matched with a motor shaft hole of a rotor iron core in size, the cylinder body is located between the upper pressing plate and the lower supporting plate, and the upper pressing plate and the lower supporting plate are fixedly connected together through a bolt. According to the utility model, the silicon steel sheets can be prevented from being pulled off or broken during magnetic steel pasting, and the position precision of magnetic steel pasting can be ensured.

Description

Technical Field

[0001] The utility model relates to a permanent magnet motor, in particular to a device for pressing permanent magnet steel on a rotor core of a permanent magnet motor, belonging to the technical field of motors. Background Art

[0002] Existing permanent magnet motors usually include a motor shaft, a stator, a rotor core and permanent magnet steel. The rotor core is formed into a cylindrical structure by laminating a plurality of silicon steel sheets. A motor shaft hole for passing through the motor shaft is arranged in the middle of the rotor core, and the permanent magnet steel is in a tile shape. For the existing rotor core of a permanent magnet motor, there are the following two disadvantages when pasting the permanent magnet steel on the outer circumferential wall surface of the rotor core: on the one hand, since the distance between the outer circle of the silicon steel sheet and the outer arc of the tile-shaped permanent magnet steel is short, the silicon steel sheet uses a punching sheet of 0.2 mm, and since the permanent magnet steel has strong magnetism, when pasting the permanent magnet steel, the pushing and pulling force can easily pull the silicon steel sheet off or break it. On the other hand, when pasting manually, the position accuracy of pasting the permanent magnet steel on the outer circumferential wall surface of the rotor core is relatively low. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a device for pressing permanent magnet steel on a rotor core of a permanent magnet motor, which can effectively prevent the silicon steel sheet from being pulled off or broken when pasting the permanent magnet steel, and can ensure the position accuracy of pasting the permanent magnet steel on the outer circumferential wall surface of the rotor core.

[0004] To solve the above technical problem, the utility model adopts such a device for pressing permanent magnet steel on a rotor core of a permanent magnet motor, including a rotor core and permanent magnet steel. The rotor core is laminated into a cylindrical structure by a plurality of silicon steel sheets. A motor shaft hole for passing through the motor shaft is arranged in the middle of the rotor core. The permanent magnet steel is in a tile shape. The device further includes a cylindrical body, an upper pressing plate and a lower supporting plate. The rotor core is placed in the inner cavity of the cylindrical body. A plurality of positioning rib plates extending radially and evenly distributed in the circumferential direction are arranged on the inner wall of the cylindrical body. A tile-shaped cavity is formed between the cylindrical body, the rotor core and two adjacent positioning rib plates. The size and shape of the tile-shaped cavity are adapted to the permanent magnet steel. The upper pressing plate and the lower supporting plate are in a disc shape. An upper positioning cylinder is arranged in the middle of the bottom surface of the upper pressing plate. A plurality of evenly distributed tile-shaped through holes are formed in the circumferential direction of the upper pressing plate. The size and shape of the tile-shaped through holes are adapted to the permanent magnet steel. A lower positioning cylinder is arranged in the middle of the top surface of the lower supporting plate. The sizes of the upper positioning cylinder and the lower positioning cylinder are adapted to the motor shaft hole of the rotor core. The cylindrical body is located between the upper pressing plate and the lower supporting plate, and the upper pressing plate and the lower supporting plate are fixedly connected together by bolts.

[0005] As a preferred embodiment of the utility model, there are 10 positioning rib plates, and 5 evenly distributed tile-shaped through holes are formed in the circumferential direction of the upper pressing plate.

[0006] As a preferred embodiment of the present utility model, two pairs of symmetrically arranged upper protrusions are provided on the outer circumferential wall surface of the upper pressing plate, and the central angle between two adjacent upper protrusions is 36°. A pair of symmetrically arranged lower protrusions are provided on the outer circumferential wall surface of the lower supporting plate, and the upper protrusions of the upper pressing plate and the lower protrusions of the lower supporting plate are fixedly connected together by bolts.

[0007] After adopting the above structure, the present utility model has the following beneficial effects:

[0008] When the present utility model is working, the upper pressing plate and the lower supporting plate are adopted, and the silicon steel sheets of the rotor core are pressed and fixed between the two by bolts. The permanent magnet uses the tile-shaped through holes on the upper pressing plate as a guide, is pressed into the tile-shaped cavity in the inner cavity of the cylinder body with glue, and is accurately pasted and fixed on the outer circumferential wall surface of the rotor core. After adopting the structure of the present utility model, accidents such as the silicon steel sheets being pulled off or broken during the pasting of the permanent magnets are effectively prevented, and the position accuracy of the permanent magnets pasted on the outer circumferential wall surface of the rotor core is ensured.

[0009] The structure of the present utility model is simple, the manufacturing cost is low, and the operation is also very convenient, which is convenient for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The following further elaborates on the specific embodiments of the present utility model in conjunction with the accompanying drawings.

[0011] Figure 1 It is a schematic structural view of a permanent magnet motor rotor core magnet pressing device of the present utility model.

[0012] Figure 2 It is a schematic structural view of the upper pressing plate in the present utility model.

[0013] Figure 3 It is a schematic structural view of the lower supporting plate in the present utility model.

[0014] Figure 4 It is a schematic structural view of the rotor core of the present utility model placed in the inner cavity of the cylinder body.

[0015] Figure 5 For Figure 4 The top view schematic diagram. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] See Figures 1 to 5A magnetic steel pressing device for a permanent magnet motor rotor core shown in the figure includes a rotor core 1 and a magnetic steel 2. The rotor core 1 is laminated by a plurality of silicon steel sheets into a cylindrical structure. In the middle of the rotor core 1, there is a motor shaft hole 1-1 for inserting a motor shaft. The magnetic steel 2 is in a tile shape. It also includes a cylindrical body 3, an upper pressing plate 4 and a lower supporting plate 5. The rotor core 1 is placed in the inner cavity of the cylindrical body 3. On the inner wall of the cylindrical body 3, there are a plurality of positioning rib plates 3-1 extending radially and evenly distributed in the circumferential direction. A tile-shaped cavity 6 is formed between the cylindrical body 3, the rotor core 1 and two adjacent positioning rib plates 3-1. The size and shape of the tile-shaped cavity 6 are adapted to the magnetic steel 2. The upper pressing plate 4 and the lower supporting plate 5 are in a disc shape. In the middle of the bottom surface of the upper pressing plate 4, there is an upper positioning cylinder 4-1. A plurality of evenly distributed tile-shaped through holes 4-2 are formed along the circumferential direction of the upper pressing plate 4. The size and shape of the tile-shaped through holes 4-2 are adapted to the magnetic steel 2. In the middle of the top surface of the lower supporting plate 5, there is a lower positioning cylinder 5-1. The sizes of the upper positioning cylinder 4-1 and the lower positioning cylinder 5-1 are adapted to the motor shaft hole 1-1 of the rotor core 1. During operation, the upper positioning cylinder 4-1 and the lower positioning cylinder 5-1 are inserted into the motor shaft hole 1-1 of the rotor core 1. The cylindrical body 3 is located between the upper pressing plate 4 and the lower supporting plate 5, and the upper pressing plate 4 and the lower supporting plate 5 are fixedly connected together by bolts 7. In the present utility model, the upper pressing plate 4 and the lower supporting plate 5 are preferably made of aluminum material, and the bolts 7 are copper bolts.

[0017] As a preferred embodiment of the present utility model, as Figure 2 , 4 , as shown in Fig. 5, there are 10 positioning rib plates 3-1. Correspondingly, there are also 10 tile-shaped cavities 6. Five evenly distributed tile-shaped through holes 4-2 are formed along the circumferential direction of the upper pressing plate 4.

[0018] As a preferred embodiment of the present utility model, as Figure 1 , 2 , as shown in Fig. 3, on the outer circumferential wall surface of the upper pressing plate 4, there are two pairs of symmetrically arranged upper protrusions 4-3. The central angle between two adjacent upper protrusions 4-3 is 36°. On the outer circumferential wall surface of the lower supporting plate 5, there is a pair of symmetrically arranged lower protrusions 5-2. The upper protrusions 4-3 of the upper pressing plate 4 and the lower protrusions 5-2 of the lower supporting plate 5 are fixedly connected together by bolts 7.

[0019] See Figure 1 , 4, as a preferred working mode of the present utility model, the upper pressing plate 4 and the lower supporting plate 5 are used, and the silicon steel sheets of the rotor core 1 are tightly fixed between them by bolts 7. The permanent magnet 2 is guided by the tile-shaped through hole 4-2 on the upper pressing plate 4, and is pressed into the tile-shaped cavity 6 in the inner cavity of the cylinder body 3 with glue and pasted and fixed on the outer circumferential wall surface of the rotor core 1. After pasting the permanent magnets 2 of the same polarity, the upper pressing plate 4 is rotated by 36°, and then the permanent magnets 2 of the other polarity are pasted.

[0020] After trial use, the structure of the present utility model is simple, which can effectively prevent the silicon steel sheets from being pulled off or broken when pasting the permanent magnets, and can ensure the position accuracy of the permanent magnets pasted on the outer circumferential wall surface of the rotor core, achieving good practical effects.

Claims

1. A permanent magnet motor rotor core magnetic steel pressing device, comprising a rotor core (1) and magnetic steel (2), wherein the rotor core (1) is formed by stacking a plurality of silicon steel sheets into a cylindrical structure, a motor shaft hole (1-1) for inserting a motor shaft is provided in the middle of the rotor core (1), and the magnetic steel (2) is in a tile shape, characterized in that: It also includes a cylindrical body (3), an upper pressure plate (4) and a lower support plate (5), wherein the rotor core (1) is placed in the inner cavity of the cylindrical body (3), and a plurality of positioning ribs (3-1) extending radially and evenly distributed circumferentially are provided on the inner wall of the cylindrical body (3), wherein a tile-shaped cavity (6) is enclosed between the cylindrical body (3), the rotor core (1) and two adjacent positioning ribs (3-1), and the size and shape of the tile-shaped cavity (6) are compatible with the magnetic steel (2), the upper pressure plate (4) and the lower support plate (5) are in the shape of a disk, and an upper positioning cylinder (4-1) is provided in the middle of the bottom surface of the upper pressure plate (4). -1), a plurality of evenly distributed tile-shaped through holes (4-2) are opened along the circumference of the upper pressure plate (4), the size and shape of the tile-shaped through holes (4-2) are compatible with the magnetic steel (2), a lower positioning cylinder (5-1) is provided in the middle of the top surface of the lower support plate (5), the size of the upper positioning cylinder (4-1) and the lower positioning cylinder (5-1) are compatible with the motor shaft hole (1-1) of the rotor core (1), the cylindrical body (3) is located between the upper pressure plate (4) and the lower support plate (5), and the upper pressure plate (4) and the lower support plate (5) are fixedly connected together by bolts (7).

2. The permanent magnet motor rotor core magnetic steel pressing device according to claim 1 is characterized in that: There are 10 positioning rib plates (3-1), and 5 evenly distributed tile-shaped through holes (4-2) are opened along the circumference of the upper pressing plate (4).

3. The permanent magnet motor rotor core magnetic steel pressing device according to claim 2 is characterized in that: Two pairs of symmetrically arranged upper protrusions (4-3) are provided on the outer circular wall surface of the upper pressure plate (4), and the central angle between two adjacent upper protrusions (4-3) is 36 degrees. A pair of symmetrically arranged lower protrusions (5-2) are provided on the outer circular wall surface of the lower support plate (5), and the upper protrusions (4-3) of the upper pressure plate (4) and the lower protrusions (5-2) of the lower support plate (5) are fixedly connected together by bolts (7).

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