Rotor core of permanent magnet brushless direct current motor

Abstract

A rotor iron core of a permanent magnet brushless direct current motor relates to the technical field of motor rotor iron cores and comprises a core cylinder, the core cylinder is composed of multiple layers of same sheet structures, the core cylinder is assembled in a splicing mode, free layout can be carried out when the core cylinder is processed, and the core cylinders are combined into a whole through first fixing screws. A limiting bolt is installed on one side of the outer portion of the sliding frame, one end of the limiting bolt penetrates into the sliding frame and extends into the inner side of the limiting piece, a limiting groove is formed in the position, corresponding to the limiting bolt, of the limiting piece, the limiting groove is in a long strip shape, and a spring is placed in the limiting groove. And when the limiting piece is ejected outwards, the spring in the limiting groove can be extruded, so that when the rotating ring rotates reversely and resets, the limiting piece can automatically reset to release the fixation of the tooth part.

Description

Technical Field

[0001] The utility model relates to the technical field of motor rotor cores, and more specifically to a permanent magnet brushless DC motor rotor core. Background Art

[0002] The permanent magnet brushless DC motor can be regarded as a DC motor that uses an electronic commutation device to replace mechanical commutation. It is mainly composed of a permanent magnet motor body, a rotor position sensor and an electronic commutation circuit. The rotor core, as an important component of the magnetic motor body, plays a vital role in the normal operation of the permanent magnet brushless DC motor.

[0003] The existing brushless motor rotor core, such as a permanent magnet brushless DC motor rotor core with publication number CN217590402U, includes a clamp, a clamp rod, a fixing plate and a spring arranged on the upper and lower sides of the tooth portion, and the tooth portion can be stably mounted on the outer side of the core barrel by utilizing the limiting function thereof, and each plate can be directly fixed by arranging a connecting screw and a fixing screw inside the core barrel ring and the tooth portion without welding operation, thereby improving the processing efficiency of the device;

[0004] However, the existing fixing method has many parts arranged on the teeth, which makes the disassembly and installation more complicated and requires each limit assembly to be moved. Therefore, the existing rotor core needs to be further improved. Utility Model Content

[0005] The utility model aims to solve the technical problem that the disassembly and installation of the gear parts in the prior art are both complicated.

[0006] The purpose and effect of the utility model are achieved by the following specific technical means:

[0007] A permanent magnet brushless DC motor rotor core comprises a core barrel, wherein the core barrel is composed of multiple layers of the same sheet structure, the core barrel is assembled by splicing, and free layout can be performed when processing the core barrel, the core barrels are combined into a whole by a first fixing screw, a nut is arranged at the other end of the first fixing screw, a tooth portion is arranged on the outer side of the core barrel, the tooth portion is formed by stacking a plurality of plate-like structures whose inner ends are isosceles trapezoids, a second fixing screw is installed inside the tooth portion, the second fixing screw combines a plurality of sheet-like tooth portions into a whole, a dovetail-shaped interlocking portion is arranged on one side of the tooth portion close to the core barrel, a dovetail groove is arranged at a position corresponding to the interlocking portion on the outer side of the core barrel, the tooth portion is connected to the core barrel by the interlocking portion, a rotating ring is arranged at the upper and lower ends of the core barrel, a convex block is arranged on the side of the rotating ring facing the tooth portion, a sliding frame is arranged between the rotating ring and the tooth portion on the upper and lower sides of the core barrel as a whole, and a limiting plate is installed inside the sliding frame.

[0008] Furthermore, the protrusions are arranged in the shape of a right-angled trapezoid with one side inclined, and the protrusions are arranged at equal distances on the outer circumference of the rotating ring.

[0009] Furthermore, the sliding frame is rectangular and hollow inside, a limiting bolt is installed on one side of the outside of the sliding frame, one end of the limiting bolt penetrates into the interior of the sliding frame and extends into the inner side of the limiting plate, the limiting plate is provided with a limiting groove corresponding to the limiting bolt, the limiting groove is long and has a spring placed inside.

[0010] Furthermore, a sliding ring is provided on the side of the rotating ring that contacts the core barrel, an annular sliding groove is provided at a position of the core barrel corresponding to the sliding ring, and an arc groove is provided inside the sliding ring.

[0011] Furthermore, a fixing bolt is installed at a position of the sliding ring corresponding to the arc groove, and the fixing bolt passes through the arc groove and enters the interior of the core tube. Beneficial Effects

[0012] A permanent magnet brushless DC motor rotor core has the following beneficial effects:

[0013] 1. A dovetail-shaped engaging portion is provided on one side of the tooth portion close to the core barrel, a dovetail groove is provided on the outer side of the core barrel at a position corresponding to the engaging portion, the tooth portion is connected to the core barrel by means of the engaging portion, rotating rings are installed at the upper and lower ends of the core barrel, a protrusion is provided on the side of the rotating ring facing the tooth portion, a sliding frame is provided between the rotating ring and the tooth portion on the upper and lower sides of the core barrel as a whole, and a limiting plate is installed inside the sliding frame. After the tooth portion is installed on the core barrel, the rotating ring can be rotated to make the inclined side of the protrusion contact with one end of the limiting plate, thereby driving the limiting plate to move outward in the sliding frame, thereby moving to one side of the tooth portion, limiting the tooth portion, and limiting plates are provided on both sides of the core barrel, so that both sides of the tooth portion can be limited and fixed.

[0014] 2. A limit bolt is installed on one side of the outside of the sliding frame. One end of the limit bolt penetrates into the inside of the sliding frame and extends into the inner side of the limit plate. The limit plate is provided with a limit groove corresponding to the limit bolt. The limit groove is in the shape of a long strip and a spring is placed inside. When the limit plate is pushed outward, the spring in the limit groove can be squeezed, so that when the rotating ring rotates in the opposite direction to reset, the limit plate can automatically reset to release the fixation of the tooth part.

[0015] 3. A sliding ring is provided on the side where the rotating ring contacts the core barrel, an annular sliding groove is provided at the position of the core barrel corresponding to the sliding ring, an arc groove is provided inside the sliding ring, a fixing bolt is installed at the position of the sliding ring corresponding to the arc groove, and the fixing bolt passes through the arc groove and enters the core barrel. When the rotating ring completes the rotation, the position of the rotating ring can be fixed by tightening the fixing bolt, thereby ensuring the contact between the protrusion and the limit plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The utility model is a schematic diagram of a permanent magnet brushless DC motor rotor core.

[0017] Figure 2 It is a top view schematic diagram of the rotating ring of the utility model.

[0018] Figure 3 For the utility model Figure 2 Enlarged schematic diagram at point A in the middle.

[0019] Figure 4 It is a cross-sectional schematic diagram of the core barrel of the present utility model.

[0020] Figure 5 For the utility model Figure 4 Enlarged schematic diagram of point B in the middle.

[0021] Figure 1-5 Middle: 1-core barrel, 101-first fixed screw, 2-tooth portion, 201-second fixed screw, 202-embedded portion, 3-sliding frame, 301-limiting bolt, 4-limiting plate, 401-limiting groove, 5-rotating ring, 501-fixing bolt, 502-arc groove, 6-bump, 7-sliding ring. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0023] Please refer to the diagram of the exploded structure of the rotor core of a permanent magnet brushless DC motor and the diagram of the planar structure in the attached drawings of the specification.

[0024] A permanent magnet brushless DC motor rotor core comprises a core barrel 1, the core barrel 1 is composed of multiple layers of the same sheet structure, the core barrel 1 is assembled by splicing, and free layout can be performed when processing the core barrel 1, the core barrels 1 are combined into a whole through a first fixing screw 101, a nut is arranged at the other end of the first fixing screw 101, a tooth portion 2 is arranged on the outside of the core barrel 1, the tooth portion 2 is formed by stacking multiple plate-like structures with isosceles trapezoidal inner ends, a second fixing screw 201 is installed inside the tooth portion 2, the second fixing screw 201 combines multiple sheet-like tooth portions 2 into a whole, a dovetail-shaped interlocking portion 202 is arranged on one side of the tooth portion 2 close to the core barrel 1, a dovetail groove is arranged on the outside of the core barrel 1 at a position corresponding to the interlocking portion 202, and the tooth portion 2 is connected to the core barrel 1 by the interlocking portion 202;

[0025] In a specific implementation, rotating rings 5 ​​are installed at the upper and lower ends of the core barrel 1. The rotating ring 5 and the core barrel 1 are arranged in concentric circles. A protrusion 6 is arranged on the side of the rotating ring 5 facing the tooth portion 2. The protrusion 6 is a right-angled trapezoid with one side inclined. The protrusions 6 are arranged equidistantly on the outer circumference of the rotating ring 5. A sliding frame 3 is arranged between the rotating ring 5 and the tooth portion 2 on the upper and lower sides of the core barrel 1 as a whole. The sliding frame 3 is rectangular and hollow inside. A limiting plate 4 is installed inside the sliding frame 3. A limiting bolt 301 is installed on one side of the outside of the sliding frame 3. One end of the limiting bolt 301 penetrates into the interior of the sliding frame 3 and extends into the inner side of the limiting plate 4. The limiting plate 4 is provided with a limiting groove 401 corresponding to the limiting bolt 301. The limiting groove 401 is in the shape of a long strip and a spring is placed inside.

[0026] In a specific implementation, a sliding ring 7 is provided on the side where the rotating ring 5 contacts the core tube 1, an annular sliding groove is provided at a position of the core tube 1 corresponding to the sliding ring 7, an arc groove 502 is provided inside the sliding ring 7, a fixing bolt 501 is installed at a position of the sliding ring 7 corresponding to the arc groove 502, and the fixing bolt 501 passes through the arc groove 502 and enters the interior of the core tube 1.

[0027] Working principle:

[0028] The tooth portion 2 is connected to the core barrel 1 by a dovetail-shaped engaging portion 202 on one side close to the core barrel 1, and a dovetail groove is provided on the outer side of the core barrel 1 at a position corresponding to the engaging portion 202. The tooth portion 2 is connected to the core barrel 1 by means of the engaging portion 202. A rotating ring 5 is installed at the upper and lower ends of the core barrel 1, and a protrusion 6 is provided on the rotating ring 5 facing the tooth portion 2. A sliding frame 3 is provided between the rotating ring 5 and the tooth portion 2 on the upper and lower sides of the core barrel 1 as a whole, and a limiting plate 4 is installed inside the sliding frame 3. When the tooth portion 2 is installed on the core barrel 1, the rotating ring 5 can be rotated to make the inclined side of the protrusion 6 contact with one end of the limiting plate 4, thereby driving the limiting plate 4 to move outward in the sliding frame 3, thereby moving to one side of the tooth portion 2 to limit the tooth portion. The limiting plates 4 are provided on both sides of the core barrel 1, so that the two sides of the tooth portion 2 can be limited and fixed. Then, a limiting bolt 301 is installed on the outer side of the sliding frame 3. The limiting bolt 301 is The end penetrates into the interior of the sliding frame 3 and extends into the inner side of the limiting plate 4. The limiting plate 4 is provided with a limiting groove 401 corresponding to the limiting bolt 301. The limiting groove 401 is in the shape of a long strip and a spring is placed inside. When the limiting plate 4 is pushed outward, the spring in the limiting groove 401 can be squeezed, so that when the rotating ring 5 is reversely rotated and reset, the limiting plate 4 can automatically reset and release the fixation of the tooth portion 2. Then, a sliding ring 7 is provided on the side that contacts the core tube 1 through the rotating ring 5. The core tube 1 is provided with an annular sliding groove at the position corresponding to the sliding ring 7. An arc groove 502 is provided inside the sliding ring 7. A fixing bolt 501 is installed at the position of the sliding ring 7 corresponding to the arc groove 502. The fixing bolt 501 passes through the arc groove 502 and enters the interior of the core tube 1. When the rotating ring 5 completes the rotation, the position of the rotating ring 5 can be fixed by tightening the fixing bolt 501, thereby ensuring the contact between the protrusion 6 and the limiting plate 4.

Claims

1. A permanent magnet brushless DC motor rotor core, comprising a core barrel (1), characterized in that: The core barrel (1) is composed of multiple layers of identical sheet-like structures. A first fixing screw (101) is arranged inside the core barrel (1). A tooth portion (2) is arranged on the outside of the core barrel (1). The tooth portion (2) is formed by stacking a plurality of plate-like structures whose inner ends are isosceles trapezoidal. A second fixing screw (201) is installed inside the tooth portion (2). A side of the tooth portion (2) close to the core barrel (1) is a dovetail-shaped interlocking portion (202). The outer side of the core barrel (1) corresponds to the interlocking portion (20 2) is provided with a dovetail groove, the tooth portion (2) is connected to the core barrel (1) by means of a fitting portion (202), a rotating ring (5) is installed at the upper and lower ends of the core barrel (1), a convex block (6) is provided on one side of the rotating ring (5), a sliding frame (3) is provided between the rotating ring (5) and the tooth portion (2) on the upper and lower sides of the core barrel (1) as a whole, a limiting plate (4) is installed inside the sliding frame (3), and a fixing bolt (501) is installed inside the rotating ring (5).

2. A permanent magnet brushless DC motor rotor core as claimed in claim 1, characterized in that: The convex blocks (6) are arranged in the form of a right-angled trapezoid with one side inclined, and the convex blocks (6) are arranged at equal distances on the outer circumference of the rotating ring (5).

3. A permanent magnet brushless DC motor rotor core as claimed in claim 1, characterized in that: The sliding frame (3) is rectangular and hollow inside. A limiting bolt (301) is installed on one side of the outside of the sliding frame (3). One end of the limiting bolt (301) penetrates into the interior of the sliding frame (3) and extends into the inside of the limiting plate (4).

4. A permanent magnet brushless DC motor rotor core as claimed in claim 3, characterized in that: The limiting plate (4) is provided with a limiting groove (401) corresponding to the limiting bolt (301); the limiting groove (401) is in the shape of an elongated strip and has a spring disposed therein.

5. A permanent magnet brushless DC motor rotor core as claimed in claim 1, characterized in that: A sliding ring (7) is provided on the side of the rotating ring (5) that contacts the core barrel (1), an annular sliding groove is provided at a position of the core barrel (1) corresponding to the sliding ring (7), and an arc groove (502) is provided inside the sliding ring (7).

6. A permanent magnet brushless DC motor rotor core as claimed in claim 5, characterized in that: A fixing bolt (501) is installed at a position of the sliding ring (7) corresponding to the arc groove (502), and the fixing bolt (501) passes through the arc groove (502) and then enters the interior of the core barrel (1).

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