CN216904466U

CN216904466U - Rotor assembly and brushless coreless cup motor

Info

Publication number: CN216904466U
Application number: CN202220243588.3U
Authority: CN
Inventors: 严超
Original assignee: Shenzhen Topband Co Ltd
Current assignee: Shenzhen Topband Co Ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-07-05
Anticipated expiration: 2032-01-26

Abstract

The utility model discloses a rotor assembly and a brushless coreless motor, and relates to the technical field of coreless motors, and the brushless coreless motor comprises a rotating shaft, wherein a metal core is arranged on the rotating shaft, and the central axis of the metal core and the central axis of the rotating shaft are superposed; the outer side surface of the metal core body is provided with a plurality of positioning convex ridges, each positioning convex ridge is distributed in a circumferential manner by using the central axis of the metal core body, the intervals between any two adjacent positioning convex ridges are equal, each positioning convex ridge defines an even number of profiling grooves on the outer side surface of the metal core body, magnetic pieces are correspondingly arranged in each profiling groove one by one, the magnetic pole directions of two adjacent magnetic pieces are opposite, and the magnetic pieces are matched with the profiling grooves; therefore, the assembly tolerance between two adjacent magnetic parts cannot influence the assembly of the subsequent magnetic parts, the assembly tolerance is ensured not to be accumulated, the overlarge interval between the magnetic part assembled at the last and the two adjacent magnetic parts is prevented, and the stability of the rotor assembly in the rotating process is improved.

Description

Rotor assembly and brushless coreless cup motor

Technical Field

The utility model relates to the technical field of coreless motors, in particular to a rotor assembly and a brushless coreless motor.

Background

The brushless coreless motor has the advantages of small volume, high rotating speed and sensitive response, and is widely applied to the fields such as a miniature power model, a precise power output device or a bionic artificial limb and the like; most brushless coreless motors on the market are provided with a plurality of magnetic elements on a rotor at the center, and the rotor is pushed to rotate through magnetic field change.

However, in the process of assembling the rotor assembly of the brushless coreless motor of the present day, when the magnetic elements are assembled one by one along the rotating shaft, the assembly tolerance between two adjacent magnetic elements can only be overcome as much as possible, and the tolerance between the magnetic elements assembled in the front can be concentrated on the assembly position of the last magnetic element, that is, the assembly tolerance between the last magnetic element and the first magnetic element can be larger, so that the overall magnetic force of the rotor assembly is unbalanced, the overall vibration amount is larger, especially under the condition that the number of the magnetic elements is set to be 6 or more, the assembly tolerance is further expanded, and the running smoothness of the motor is lower.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a rotor assembly and a brushless coreless motor which can operate stably.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the application provides a rotor assembly, which comprises a rotating shaft, wherein a metal core body is arranged on the rotating shaft, and the central axis of the metal core body is overlapped with the central axis of the rotating shaft;

the outer side surface of the metal core body is provided with a plurality of positioning convex ridges, each positioning convex ridge is distributed in a circumferential manner around the central axis of the metal core body, the intervals between any two adjacent positioning convex ridges are equal, each positioning convex ridge defines an even number of profiling grooves on the outer side surface of the metal core body, magnetic pieces are correspondingly arranged in each profiling groove one by one, the magnetic pole directions of two adjacent magnetic pieces are opposite, and the magnetic pieces are matched with the profiling grooves.

In some embodiments, the rotor assembly further includes at least two non-ferromagnetic sheaths, each of the non-ferromagnetic sheaths is sleeved outside each of the magnetic members, and an inner side surface of each of the non-ferromagnetic sheaths is supported against an outer side surface of each of the magnetic members, so that the magnetic members are abutted against the groove wall of the contour groove.

In some embodiments, the rotor assembly further includes two balance limiting rings sleeved on the rotating shaft, the metal core is located between the two balance limiting rings, and each balance limiting ring is supported against the metal core and the magnetic member.

In some embodiments, the balance limiting ring is annular, and the wall thickness of each position of the balance limiting ring is equal.

In some embodiments, a plurality of glue grooves are formed in the outer side wall of the rotating shaft, the notches of the glue grooves are used for containing glue and face the metal core, and the glue grooves are circumferentially distributed around the central axis of the rotating shaft.

In some embodiments, the metal core is provided with an insertion hole penetrating along a central axis direction of the metal core, and the rotating shaft is used for being inserted into the insertion hole.

In some embodiments, the end of the shaft is provided with a first chamfer and the socket is provided with a second chamfer at the aperture.

In some embodiments, the height of the positioning ridge is less than the thickness of the magnetic member.

In some embodiments, each of the positioning ridges is of unitary construction with the metal core.

On the other hand, this application still provides a brushless coreless motor, its including motor housing and above-mentioned any one technical scheme in the rotor subassembly, the rotor subassembly rotate set up in motor housing.

The rotor assembly and the brushless coreless motor at least have the following beneficial effects:

according to the rotor assembly and the brushless coreless motor, the metal core arranged on the rotating shaft is provided with the plurality of positioning convex ridges to define even number of profile grooves which are independent of each other, so that the installation position of each magnetic part is always limited in the corresponding profile groove, the assembly tolerance between two adjacent magnetic parts cannot influence the assembly of the subsequent magnetic parts, the assembly tolerances cannot be accumulated, the overlarge interval between the last assembled magnetic part and two adjacent magnetic parts is prevented, and the stability of the rotor assembly in the rotating process is improved.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view of the construction of a rotor assembly in a preferred embodiment of the present invention;

fig. 2 is an exploded view of the rotor assembly shown in fig. 1.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Fig. 1 and 2 illustrate a rotor assembly 10 in accordance with some preferred embodiments of the present invention, the rotor assembly 10 being used to assemble an electric machine that functions to rotate to output power. As shown in fig. 1 and 2, the rotor assembly 10 includes a rotating shaft 1, a metal core 2 and a plurality of magnetic members 3, the metal core 2 is disposed on the rotating shaft 1, a central axis of the metal core 2 and a central axis of the rotating shaft 1 are overlapped, and each of the magnetic members 3 is disposed on the metal core 2. The rotating shaft 1 plays a role of outputting torque and is fixed with the metal core body 2. The metal core 2 is used for fixing each magnetic part 3, and each magnetic part 3 is stressed in an external magnetic field, so that the metal core 2 drives the rotating shaft 1 to rotate.

As shown in fig. 1 and 2, the rotor assembly 10 further includes a plurality of positioning ridges 21 disposed on the outer side surface of the metal core 2, each positioning ridge 21 is circumferentially distributed around the central axis of the metal core 2, the intervals between any two adjacent positioning ridges 21 are equal, each positioning ridge 21 defines an even number of contour grooves 22 on the outer side surface of the metal core 2, each magnetic member 3 is disposed in each contour groove 22 in a one-to-one correspondence, the magnetic poles of two adjacent magnetic members 3 are opposite in direction, and the magnetic members 3 are adapted to the contour grooves 22.

It is understood that both side surfaces of the positioning ridge 21 are respectively in contact with the side surfaces of two magnetic members 3, that is, two adjacent magnetic members 3 are separated by the same positioning ridge 21. During the assembly, the mounted position of each magnetic part 3 all can be spacing in the profile groove 22 that each cell body profile is the same to prevent that the assembly error of magnetic part 3 from accumulating gradually and causing very big influence to last magnetic part 3, improved rotor subassembly 10's dynamic balance, reduced the vibration volume of motor, improved the operation smoothness of product.

It will also be understood that the included angles formed by connecting the centers of any two adjacent positioning ridges 21 to the center of the metal core 2 are equal; further, the size of the angle formed by connecting the centers of two adjacent positioning ridges 21 to the center of the metal core 2 multiplied by the number of the magnetic members 3 is equal to the size of the angle of the fillet. For example, if a single assembled rotor assembly 10 has four magnetic members 3, the angle formed by connecting the centers of two adjacent positioning ridges 21 to the center of the metal core 2 is 90 °; if six magnetic members 3 are provided on the assembled single rotor assembly 10, the included angle formed by connecting the centers of two adjacent positioning ridges 21 to the center of the metal core 2 is 60 °.

Preferably, the metal core 2 may be made of low carbon steel, and has the advantages of high strength, light weight, and easy processing. The rotating shaft 1 and the metal core 2 can be fixedly connected through an adhesive material or substance such as anaerobic glue.

As shown in fig. 1 and 2, the rotor assembly 10 may further include at least two non-ferromagnetic sheaths 4 in some embodiments, each non-ferromagnetic sheath 4 is sleeved outside each magnetic member 3, and an inner side surface of each non-ferromagnetic sheath 4 is supported against an outer side surface of each magnetic member 3, so that the magnetic members 3 are abutted against groove walls of the contour grooves 22.

It will be appreciated that the non-ferromagnetic sheath 4 may be made of stainless steel to ensure the hardness of the non-ferromagnetic sheath 4 and to ensure that it has no magnetic permeability. The non-ferromagnetic sheath 4 plays a role in fixing each magnetic member 3 to the metal core 2, and prevents the magnetic member 3 from being gradually peeled off from the metal core 2 due to the effect of centrifugal force for a long time, thereby preventing the reduction of the rotational stability of the rotor assembly 10 due to the deviation of the magnetic member 3.

In particular, the non-ferromagnetic sheath 4 can be connected to the respective magnetic element 3 by gluing.

As shown in fig. 1 and 2, the rotor assembly 10 may further include two balance limiting rings 5 sleeved on the rotating shaft 1 in some embodiments, the metal core 2 is located between the two balance limiting rings 5, and each balance limiting ring 5 is supported against the metal core 2 and the magnetic member 3.

Understandably, the balance limiting ring 5 is used for limiting the magnetic part 3 and the metal core 2 and preventing the magnetic part and the metal core from sliding along the central axis direction of the rotating shaft 1; specifically, a side surface of the balance limiting ring 5 is respectively abutted against the metal core 2 and each magnetic part 3, and the arrangement of the two balance limiting rings 5 enables the metal core 2 and each magnetic part 3 to be always limited between the two balance limiting rings 5.

As shown in fig. 1 and 2, the balanced retainer 5 may be in a ring shape in some embodiments, and the wall thickness of each position of the balanced retainer 5 is equal.

The through hole is arranged in the center of the annular balance limiting ring 5, the rotating shaft 1 is penetrated, the central axis of the rotating shaft 1 and the central axis of the balance limiting ring 5 coincide with each other, the dynamic balance of the whole rotating process of the rotor assembly 10 is further guaranteed, and the running stability of the motor is improved.

As shown in fig. 1 and 2, in some embodiments, a plurality of glue grooves 11 are disposed on an outer side wall of the rotating shaft 1, a notch of each glue groove 11 is used for accommodating glue and faces the metal core 2, and each glue groove 11 is circumferentially distributed around a central axis of the rotating shaft 1.

It can be understood that, after the glue is coated on the outer side wall of the rotating shaft 1, the glue will go deep into the glue groove 11, increasing the bonding area between the glue and the rotating shaft 1 and improving the bonding force between the rotating shaft 1 and the metal core 2. The circumferential distribution mode can avoid gradual torsion and dislocation between the rotating shaft 1 and the metal core body 2 due to small local bonding force.

As shown in fig. 1 and 2, in some embodiments, the metal core 2 is provided with an insertion hole 23 penetrating along a central axis direction of the metal core 2, and the rotating shaft 1 is used for being inserted into the insertion hole 23.

Understandably, the aperture size of the jack 23 is matched with the shaft diameter of the rotating shaft 1, so that the jack and the rotating shaft can be tightly matched, and the stability and the reliability of power transmission are ensured.

As shown in fig. 1 and 2, in some embodiments, the end of the shaft 1 is provided with a first chamfer 12, and the socket 23 is provided with a second chamfer 24 at the orifice.

Understandably, the arrangement of the first chamfer 12 and the second chamfer 24 can guide the rotating shaft 1 to be aligned with the jack 23 correctly, and the assembly difficulty is reduced.

As shown in fig. 1 and 2, in some embodiments, the height of the positioning ridge 21 is less than the thickness of the magnetic member 3.

It can be understood that after the magnetic members 3 are assembled, the positioning ridges 21 do not protrude out of the two magnetic members 3; the positioning convex ridge 21 only needs to meet the requirements of limiting and defining the installation position of the magnetic part 3, and the positioning convex ridge 21 with smaller height can enable the center of gravity of the metal core body 2 to be more concentrated in the central position, thereby being more beneficial to the lifting of dynamic balance.

As shown in fig. 1 and 2, in some embodiments, each positioning ridge 21 is formed as a single piece with the metal core 2.

It can be understood that the positioning ridge 21 and the metal core 2 are integrally formed, which can improve the mechanical strength of the connection position of the two and prolong the service life of the metal core 2.

As shown in fig. 1 and 2, the brushless coreless motor in some embodiments includes a motor housing, and the rotor assembly 10 in any one of the above embodiments, wherein the rotor assembly 10 is rotatably disposed in the motor housing.

As will be appreciated, the brushless coreless motor is configured to drive the rotor assembly 10 in rotation in the energized state, thereby providing an output torque. The rotor assembly 10 may be rotatably mounted to the motor housing by bearings.

according to the rotor assembly and the brushless coreless motor, the metal core arranged on the rotating shaft is provided with the plurality of positioning convex ridges to define an even number of mutually independent profile grooves, so that the mounting position of each magnetic part is always limited in the corresponding profile groove, the assembly tolerance between two adjacent magnetic parts cannot influence the assembly of the subsequent magnetic parts, the assembly tolerances cannot be accumulated, the overlarge interval between the last assembled magnetic part and the two adjacent magnetic parts is prevented, and the stability of the rotor assembly in the rotating process is improved.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. A rotor assembly comprises a rotating shaft (1), and is characterized in that a metal core (2) is arranged on the rotating shaft (1), and the central axis of the metal core (2) and the central axis of the rotating shaft (1) are overlapped;

the outer side surface of the metal core body (2) is provided with a plurality of positioning convex ridges (21), each positioning convex ridge (21) is distributed in a circumferential mode with the central axis of the metal core body (2), the intervals between any two adjacent positioning convex ridges (21) are equal, each positioning convex ridge (21) defines an even number of profiling grooves (22) on the outer side surface of the metal core body (2), magnetic pieces (3) are correspondingly arranged in each profiling groove (22) one by one, the magnetic pole directions of every two adjacent magnetic pieces (3) are opposite, and the magnetic pieces (3) are matched with the profiling grooves (22).

2. The rotor assembly according to claim 1, wherein the rotor assembly (10) further comprises at least two non-ferromagnetic sheaths (4), each non-ferromagnetic sheath (4) is sleeved outside each magnetic member (3), and an inner side surface of each non-ferromagnetic sheath (4) is abutted against an outer side surface of each magnetic member (3) so that the magnetic members (3) are abutted against groove walls of the contour groove (22).

3. The rotor assembly according to claim 1, wherein the rotor assembly (10) further comprises two balance limiting rings (5) sleeved on the rotating shaft (1), the metal core (2) is located between the two balance limiting rings (5), and each balance limiting ring (5) is supported against the metal core (2) and the magnetic member (3).

4. The rotor assembly according to claim 3, wherein the balancing stop collar (5) is ring-shaped, and the wall thickness of each position of the balancing stop collar (5) is equal.

5. The rotor assembly according to claim 1, wherein a plurality of glue grooves (11) are formed in an outer side wall of the rotating shaft (1), notches of the glue grooves (11) are used for containing glue and face the metal core (2), and the glue grooves (11) are circumferentially distributed around a central axis of the rotating shaft (1).

6. The rotor assembly according to claim 1, wherein the metal core (2) is provided with an insertion hole (23) penetrating along a central axis direction of the metal core (2), and the rotating shaft (1) is used for being inserted into the insertion hole (23).

7. The rotor assembly according to claim 6, wherein the end of the shaft (1) is provided with a first chamfer (12) and the receptacle (23) is provided with a second chamfer (24) at the aperture.

8. The rotor assembly (10) according to claim 1, wherein the height of the positioning ridge (21) is less than the thickness of the magnetic member (3).

9. The rotor assembly according to claim 8, wherein each of the positioning ridges (21) is of integral construction with the metal core (2).

10. A brushless coreless motor, comprising a motor housing, and a rotor assembly (10) as claimed in any one of claims 1 to 9, the rotor assembly (10) being rotatably disposed within the motor housing.