CN214755786U

CN214755786U - Permanent magnet brushless motor rotor punching sheet structure

Info

Publication number: CN214755786U
Application number: CN202121295497.6U
Authority: CN
Inventors: 赵光辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2021-11-16
Anticipated expiration: 2031-06-10

Abstract

The utility model belongs to the technical field of permanent magnet brushless motor manufacturing and designing, in particular to permanent magnet brushless motor rotor punching sheet structure, motor are permanent magnet inner rotor structure, and the permanent magnet is the table at the rotor surface and pastes the formula, still includes the rotor towards the piece, and the centre of a circle department of rotor towards the piece has the pivot hole, and the rotor is equipped with a plurality of permanent magnet groove towards the circumferential surface of piece, establishes arch, its characterized in that between per two permanent magnet grooves: the protrusion is provided with a groove therein. The utility model discloses an establish the rotor punching of recess in forked tail location arch can effectively reduce thereby adjacent permanent magnet magnetic leakage and improve motor output, restrain back electromotive force harmonic content, establishes the recess simultaneously and can make the location arch have certain elasticity to make the permanent magnet be difficult to drop under the impact vibrations condition.

Description

Permanent magnet brushless motor rotor punching sheet structure

Technical Field

The utility model belongs to the technical field of permanent magnet brushless motor manufacturing and designing, in particular to can fix the permanent magnet simultaneously and can reduce the rotor punching of adjacent opposite sex permanent magnet magnetic leakage.

Background

The surface-mounted permanent magnet brushless motor rotor permanent magnet fixing is usually realized by arranging a dovetail-shaped positioning protrusion on a rotor punching sheet, for example, a rotor punching sheet for an electric vehicle motor with the authorization publication number of CN201466829U discloses a dovetail-shaped positioning protrusion fixed permanent magnet rotor punching sheet structure, but because the dovetail-shaped positioning protrusion is positioned in the middle of adjacent opposite permanent magnets, according to the principle that magnetic lines of force pass through the minimum magnetic resistance, partial magnetic lines of force of the adjacent opposite permanent magnets can be directly closed through the dovetail-shaped positioning protrusion, so that the magnetic leakage is caused, the output torque of the motor is reduced, and the content of counter potential harmonic is also increased. Meanwhile, the dovetail-shaped positioning protrusions have no certain toughness, so that the permanent magnets are easy to fall off when the motor is impacted and vibrated.

Disclosure of Invention

The utility model aims at solving the shortcoming that exists among the prior art, and the permanent magnet brushless motor rotor punching structure who provides.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a permanent magnetism brushless motor rotor punching structure, the motor is permanent magnetism inner rotor structure, and the permanent magnet is the surface-mounted formula on the rotor surface, and the centre of a circle department of rotor punching (1) has pivot hole (2), and the circumferential surface of rotor punching (1) is equipped with a plurality of permanent magnet groove (3), establishes arch (4) between per two permanent magnet groove (1), and arch (4) mainly play the permanent magnet effect of location, sets up recess (5) in arch (4). The protrusions (4) are in a dovetail shape, the grooves (5) are rectangular, the height of the grooves (5) is H1, and the height of the protrusions (4) is H2, so that 2H 2 is not less than H1 and not more than 3H 2; the width of the groove (5) is W1, the width of the bottom of the protrusion (4) is W2, and then W1 is more than or equal to 0.8W 2 and more than or equal to 0.5W 2. A plurality of permanent magnet groove (3) evenly sets up at the circumferential surface of rotor punching (1), and recess (5) set up in the surface middle part of arch (4), and recess (5) that set up in arch (4) also can the surface seal form the hole, thereby also play the effect that reduces the permanent magnet magnetic leakage and improve motor output, restrain back electromotive force harmonic content, establish the hole simultaneously and make arch (4) have certain elasticity to make the permanent magnet be difficult to drop under the impact vibrations condition.

Compared with the prior art, the invention has the beneficial effects that: recess (5) that set up in arch (4) have increased the magnetic leakage magnetic resistance of adjacent different in nature permanent magnet, have reduced the direct closed probability of adjacent different in nature permanent magnet magnetic line of force, have increased the output torque of motor, have also reduced back electromotive force harmonic content, establish simultaneously recess (5) and can make arch (4) have certain elasticity and toughness, make the permanent magnet be difficult to drop under the impact vibrations condition.

Drawings

Fig. 1 is a schematic diagram of a conventional permanent magnet brushless rotor punching sheet.

Fig. 2 is a schematic diagram of a permanent magnet brushless rotor punching sheet provided by the present invention.

Fig. 3 is a schematic view of a permanent magnet brushless rotor punching sheet according to the present invention.

FIG. 4 is a comparison of torque for a convex grooved and non-grooved punch.

FIG. 5 is a comparison of harmonic content for raised slotted and non-slotted punches.

In the figure: 1 rotor punching sheet, 2 rotating shaft holes, 3 permanent magnet grooves, 4 protrusions, 5 grooves, the height of an H1 groove, the height of an H2 protrusion, the width of a W1 groove and the width of a W2 protrusion.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

The utility model provides a permanent magnet brushless motor rotor punching structure, the motor is permanent magnetism inner rotor structure, and the permanent magnet is the surface-mounted formula on the rotor surface, and the centre of a circle department of rotor punching (1) has pivot hole (2), and the circumferential surface of rotor punching (1) is equipped with a plurality of permanent magnet groove (3), establishes arch (4) between per two permanent magnets, and arch (4) mainly play the effect of location permanent magnet, set up recess (5) in arch (4). The protrusions (4) are in a dovetail shape, the grooves (5) are rectangular, the height of the grooves (5) is H1, the height of the protrusions is H2, and then 2 × H2 is not less than H1 and not more than 3 × H2; the width of the groove (5) is W1, the width of the bottom of the protrusion (4) is W2, and then W1 is more than or equal to 0.8W 2 and more than or equal to 0.5W 2. A plurality of permanent magnet grooves (3) are uniformly formed in the circumferential surface of the rotor punching sheet (1), grooves (5) are formed in the middle of the outer surface of the protrusions (4), and the grooves (5) formed in the protrusions (4) can also be sealed on the surface to form holes.

Examples

Scheme 1 is permanent magnetism inner rotor structure, and the permanent magnet is the surface-mounted formula on the rotor surface, and the centre of a circle department of rotor punching (1) has pivot hole (2), and the circumferential surface of rotor punching (1) is equipped with 8 permanent magnet grooves (3) uniformly, establishes arch (4) between per two permanent magnet grooves (3), and arch (4) mainly play the effect of location permanent magnet, and the surface middle part of arch (4) sets up recess (5). The protrusions (4) are dovetail-shaped, the grooves (5) are rectangular, the height of the protrusions (4) is H2, and the height of the grooves (5) is H1= 2.2H 2. The width of the bottom of the protrusion (4) is W2, and the width of the groove (5) is W1= 0.75W 2. The bulge (4) of the scheme 2 is in a dovetail shape and is not provided with a groove.

Under the same condition, the torque of the motor with the groove arranged in the middle of the outer surface of the bulge is increased by 1.5% in a case of a scheme 1, namely a scheme 2, and the amplitude of the counter potential 5 th harmonic is reduced by 0.17% in a case of a motor with the groove arranged in the middle of the outer surface of the bulge at 1000 rpm.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be within the technical scope of the present invention, and the technical solution and the concept of the present invention are equivalent to or changed according to the present invention, and all those skilled in the art should be covered by the scope of the present invention.

Claims

1. The utility model provides a permanent magnetism brushless motor rotor punching structure, motor are permanent magnetism inner rotor structure, and the permanent magnet still includes rotor punching (1) for the surface mounting formula on rotor surface, and the centre of a circle department of rotor punching (1) has pivot hole (2), and the circumferential surface of rotor punching (1) is equipped with a plurality of permanent magnet groove (3), establishes arch (4), its characterized in that between per two permanent magnet groove (3): a groove (5) is arranged in the bulge (4).

2. The rotor punching structure of the permanent magnet brushless motor according to claim 1, wherein the protrusions (4) are dovetail-shaped.

3. The rotor punching structure of the permanent magnet brushless motor according to claim 1, wherein the groove (5) is rectangular.

4. The rotor punching structure of the permanent magnet brushless motor according to claim 3, wherein the height of the groove (5) is H1, and the height of the protrusion (4) is H2, so that 2H 2 is not less than H1 is not less than 3H 2.

5. The rotor punching structure of the permanent magnet brushless motor according to claim 3, wherein the width of the groove (5) is W1, and the width of the bottom of the protrusion (4) is W2, so that the width of W1 is more than or equal to 0.5X W2 and less than or equal to 0.8X W2.

6. The structure of the rotor punching sheet of the permanent magnet brushless motor according to claim 1, wherein a plurality of permanent magnet grooves (3) are uniformly arranged on the circumferential surface of the rotor punching sheet (1).

7. The rotor punching structure of the permanent magnet brushless motor according to claim 1, wherein the groove (5) is formed in the middle of the outer surface of the protrusion (4).

8. The utility model provides a permanent magnetism brushless motor rotor punching structure, motor are permanent magnetism inner rotor structure, and the permanent magnet still includes rotor punching (1) for the surface mounting formula on rotor surface, and the centre of a circle department of rotor punching (1) has pivot hole (2), and the circumferential surface of rotor punching (1) is equipped with a plurality of permanent magnet groove (3), establishes arch (4), its characterized in that between per two permanent magnet groove (3): the bulge (4) is provided with a hole.