Permanent magnet rotor

Abstract

The utility model discloses a permanent magnet rotor, which comprises a rotating shaft, a plurality of magnetic steel rotor cores arranged on the rotating shaft and a flat key connecting the rotating shaft and the magnetic steel rotor cores, and the magnetic steel rotor cores comprise a plurality of rotor punching sheets, a plurality of magnetic steels and rivets connecting the magnetic steels and the rotor punching sheets. A plurality of groups of through holes are circumferentially formed in the rotor punching sheets, the rivets press the plurality of rotor punching sheets to enable the corresponding through holes to form mounting grooves, the magnetic steel is arranged in the mounting grooves, each rotor punching sheet comprises a circular body and a plurality of circular arc bodies arranged on the outer side of the circular body, and the circular arc bodies correspond to the mounting grooves. The magnetic steel has the advantages that the arrangement of the arc body enables the limiting thickness of the magnetic steel in the centrifugal force direction to be increased, the thickness of the magnetic isolation bridge is not increased, the magnetic steel can bear larger centrifugal force when the rotor rotates, and the tensile stress resistance of the magnetic steel is improved.

Description

Technical Field

[0001] The utility model relates to the field of electronic rotors, in particular to a permanent magnet rotor. Background Art

[0002] When the rotor of a high-speed motor rotates at high speed, conventional rotor punchings cannot withstand the huge centrifugal force, and special high-strength silicon steel sheets are needed to improve the rotor stiffness; the rotor magnets are made of sintered materials and cannot withstand the tensile stress of the high-speed rotation of the rotor, so special designs must be made for the protection of the magnet body. In the design of the punchings for installing the magnets, the outer cylindrical part corresponding to the installation of the magnets will have a limiting effect on the magnets when the motor is working. If the diameter of the punchings is increased as a whole, the thickness of the magnetic isolation bridge will increase. The thicker the magnetic isolation bridge, the smaller the magnetic saturation and the smaller the leakage reactance, and the magnetic circuit will be easier to pass through the magnetic isolation bridge, thereby reducing the magnetic isolation effect.

[0003] In view of this, it is necessary to provide a permanent magnet rotor. Summary of the invention

[0004] The utility model provides a permanent magnet rotor, which effectively solves the problems that the existing rotor punchings have poor resistance to centrifugal force and the magnetic steel has weak resistance to tensile stress.

[0005] The technical solution adopted by the utility model is

[0006] A permanent magnet rotor comprises a rotating shaft, a plurality of rotor cores with magnetic steel arranged on the rotating shaft, and a flat key connecting the rotating shaft and the rotor core with magnetic steel, wherein the rotor core with magnetic steel comprises a plurality of rotor punchings, a plurality of magnetic steels, and rivets connecting the magnetic steels and the rotor punchings, wherein the rotor punchings are circumferentially provided with a plurality of groups of through holes, wherein the rivets press-fit the plurality of rotor punchings so that the corresponding through holes form mounting grooves, wherein the magnetic steels are arranged in the mounting grooves, and wherein the rotor punchings comprise a circular body and a plurality of arc bodies arranged outside the circular body, wherein the arc bodies correspond to the mounting grooves.

[0007] Furthermore, an axial hole is provided on the rotor punching sheet, and the axial hole includes a circular hole and a rectangular hole, the rectangular hole is connected to the circular hole, and the rivet presses a plurality of rotor punching sheets to form a cylindrical hole corresponding to the circular hole, and the rectangular hole forms a card slot, and a key slot corresponding to the card slot is provided on the rotating shaft, and the two sides of the flat key are respectively located in the key slot and the card slot, and the rotating shaft is installed in the cylindrical hole, and a plurality of the through holes are circumferentially arranged with the circular hole as the center.

[0008] Furthermore, the installation groove includes a No. 1 groove and a No. 2 groove which are symmetrically arranged, and the No. 1 groove includes a strip groove and an irregular groove No. 1 and an irregular groove No. 2 which are arranged at both ends of the strip groove, and the irregular groove No. 1 and the irregular groove No. 2 are both provided with abutting portions for abutting against the ends of the magnetic steel.

[0009] Furthermore, resin is provided in the first irregular groove and the second irregular groove, and the resin fills the gap between the magnetic steel and the rotor punching sheet.

[0010] Furthermore, a plurality of de-weighting and magnetic isolation holes are circumferentially arranged on the rotor punching sheet, the plurality of de-weighting and magnetic isolation holes correspond to a plurality of through holes one by one, and the plurality of de-weighting and magnetic isolation holes are located inside the through holes.

[0011] The beneficial effects of the utility model are as follows: the setting of the arc body increases the limiting thickness of the magnetic steel in the direction of the centrifugal force without increasing the thickness of the magnetic isolation bridge, so that it can withstand greater centrifugal force when the rotor rotates, thereby improving the ability of the rotating magnetic steel to resist tensile stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is an overall schematic diagram of the permanent magnet rotor provided in an embodiment of the present application.

[0013] Figure 2 A schematic plan view of a rotor punching of a permanent magnet rotor provided in an embodiment of the present application.

[0014] Figure 3 A partial schematic diagram of a rotor punching of a permanent magnet rotor provided in an embodiment of the present application.

[0015] Figure 4 A schematic diagram of a magnetic steel rotor core of a permanent magnet rotor provided in an embodiment of the present application.

[0016] Figure 5 for Figure 4 A magnified schematic diagram of area A in the middle.

[0017] The markings in the figure are: 1. rotating shaft; 2. flat key; 3. rotor core with magnetic steel; 31. rotor punching sheet; 32. magnetic steel; 33. rivet; 301. through hole; 302. mounting slot; 311. circular body; 312. arc body; 303. shaft hole; 331. round hole; 332. rectangular hole; 321. strip slot; 322. irregular slot No. 1; 323. irregular slot No. 2; 4. resin; 305. de-weighting and magnetic isolation hole; 3011. slot No. 1; 3012. slot No. 2. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0019] like Figure 1 , Figure 2 and Figure 3As shown, a permanent magnet rotor provided in an embodiment of the present application comprises a rotating shaft 1, a plurality of magnetic steel rotor cores 3 arranged on the rotating shaft 1, and a flat key 2 connecting the rotating shaft 1 and the magnetic steel rotor cores 3, as shown in FIG. Figure 4 As shown, the rotor core 3 with magnetic steel includes a plurality of rotor punchings 31, a plurality of magnetic steels 32 and rivets 33 connecting the magnetic steels 32 and the rotor punchings 31. A plurality of groups of through holes 301 are circumferentially arranged on the rotor punchings 31. The rivets 33 press the plurality of rotor punchings 31 so that the corresponding through holes 301 form mounting grooves 302. The magnetic steels 32 are arranged in the mounting grooves 302. The rotor punchings 31 include a circular body 311 and a plurality of arc bodies 312 arranged outside the circular body 311. The arc bodies 312 correspond to the mounting grooves 302.

[0020] It should be noted that an area is formed between the outer side of the arc body 312 and the through hole 301 to protect the magnetic steel from centrifugal tensile stress, and the rest is a magnetic isolation bridge.

[0021] In actual use, the magnetic steel rotor core 3 will rotate under the drive of the rotating shaft 1. During the rotation process, due to the effect of centrifugal force, the steel magnet will tend to move to one side of the arc body 312.

[0022] In the above design, the setting of the arc body 312 increases the limiting thickness of the magnetic steel 32 in the direction of the centrifugal force, so that it can withstand a greater centrifugal force when the rotor rotates, thereby improving the ability of the rotating magnetic steel 32 to resist tensile stress.

[0023] Specifically: Figure 2 As shown, the rotor punching sheet 31 is provided with an axial hole 303, and the axial hole 303 includes a circular hole 331 and a rectangular hole 332. The rectangular hole 332 is connected to the circular hole 331. The rivet 33 presses a plurality of rotor punching sheets 31 to form a cylindrical hole corresponding to the circular hole 331, and the rectangular hole 332 forms a slot. The rotating shaft 1 is provided with a keyway corresponding to the slot, and the two sides of the flat key 2 are respectively located in the keyway and the slot. The rotating shaft 1 is installed in the cylindrical hole, and the plurality of through holes 301 are circumferentially arranged with the circular hole 331 as the center.

[0024] In actual use, the rotating shaft 1 is installed in the cylindrical hole, and the flat key 2 is installed in the clamping groove and the keyway, so as to achieve a fixed connection between the plurality of rotor punchings 31 and the rotating shaft 1 .

[0025] In the above design, the structural design and specific implementation of the rotor punching 31 and the rotating shaft 1 can facilitate the connection between the rotor punching 31 and the rotating shaft 1 .

[0026] Specifically: Figure 3 As shown, the installation slot 302 includes a first slot 3011 and a second slot 3012 that are symmetrically arranged. Figure 2As shown, the first slot 3011 includes a strip slot 321 and a first irregular slot 322 and a second irregular slot 323 arranged at both ends of the strip slot 321. The first irregular slot 322 and the second irregular slot 323 are both provided with abutting portions for abutting against the ends of the magnetic steel 32.

[0027] In actual use, the magnetic steel 32 is installed in the strip groove 321, and the two ends of the magnetic steel 32 are respectively abutted against the abutting parts on both sides.

[0028] In the above design, the structural design of the mounting groove 302 facilitates the installation of the magnetic steel 32 and improves the assembly efficiency.

[0029] Specifically: Figure 4 and Figure 5 As shown, resin 4 is disposed in both the first irregular groove 322 and the second irregular groove 323 , and the resin 4 fills the gap between the magnetic steel 32 and the rotor punching sheet 31 .

[0030] In actual use, the magnet 32 ​​is fixed in the mounting groove 302 by the high strength of the resin 4, which can ensure the stability of the position of the magnet 32.

[0031] Specifically: Figure 2 , Figure 4 and Figure 5 As shown, a plurality of de-weighting and magnetic isolation holes 305 are circumferentially arranged on the rotor punching sheet 31 , and the plurality of de-weighting and magnetic isolation holes 305 correspond to a plurality of through holes 301 one by one, and the plurality of de-weighting and magnetic isolation holes 305 are located inside the through holes 301 .

[0032] In the above design, by providing the weight-removing magnetic isolation holes 305, the weight of the rotor can be effectively reduced, and the magnetic field can be effectively isolated.

[0033] To further explain in detail, it should be understood that the above is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A permanent magnet rotor, comprising a rotating shaft (1), a plurality of magnetic steel rotor cores (3) arranged on the rotating shaft (1), and a flat key (2) connecting the rotating shaft (1) and the magnetic steel rotor cores (3), characterized in that: The magnetic steel rotor core (3) comprises a plurality of rotor punching sheets (31), a plurality of magnetic steels (32) and rivets (33) connecting the magnetic steels (32) and the rotor punching sheets (31); a plurality of groups of through holes (301) are circumferentially arranged on the rotor punching sheets (31); the rivets (33) press the plurality of rotor punching sheets (31) so that the corresponding through holes (301) form mounting grooves (302); the magnetic steels (32) are arranged in the mounting grooves (302); the rotor punching sheets (31) comprise a circular body (311) and a plurality of circular arc bodies (312) arranged outside the circular body (311); the circular arc bodies (312) correspond to the mounting grooves (302).

2. The permanent magnet rotor according to claim 1, characterized in that: The rotor punching sheet (31) is provided with an axial hole (303), the axial hole (303) includes a circular hole (331) and a rectangular hole (332), the rectangular hole (332) is connected to the circular hole (331), the rivet (33) presses a plurality of rotor punching sheets (31) to form a cylindrical hole corresponding to the circular hole (331), the rectangular hole (332) forms a clamping groove, the rotating shaft (1) is provided with a key groove corresponding to the clamping groove, the two sides of the flat key (2) are respectively located in the key groove and the clamping groove, the rotating shaft (1) is installed in the cylindrical hole, and the plurality of through holes (301) are circumferentially arranged with the circular hole (331) as the center.

3. The permanent magnet rotor according to claim 1, characterized in that: The mounting groove (302) comprises a first groove (3011) and a second groove (3012) which are symmetrically arranged, the first groove (3011) comprises a strip groove (321) and a first irregular groove (322) and a second irregular groove (323) arranged at two ends of the strip groove (321), and the first irregular groove (322) and the second irregular groove (323) are both provided with abutting portions for abutting against the ends of the magnetic steel (32).

4. The permanent magnet rotor according to claim 3, characterized in that: Resin (4) is disposed in both the first irregular groove (322) and the second irregular groove (323), and the resin (4) fills the gap between the magnetic steel (32) and the rotor punching sheet (31).

5. The permanent magnet rotor according to claim 1, characterized in that: A plurality of de-weighting and magnetic isolation holes (305) are circumferentially arranged on the rotor punching sheet (31), the plurality of de-weighting and magnetic isolation holes (305) correspond to a plurality of through holes (301) one by one, and the plurality of de-weighting and magnetic isolation holes (305) are located inside the through holes (301).

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