CN219145218U

CN219145218U - Outer rotor low noise brushless motor

Info

Publication number: CN219145218U
Application number: CN202223510256.6U
Authority: CN
Inventors: 赵磊; 赵成龙; 王治强; 郑伟; 彭振华; 吴国旭; 黄延明; 张韩
Original assignee: Suzhou Ruidong Electric Technology Co ltd
Current assignee: Suzhou Ruidong Electric Technology Co ltd
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-06-06
Anticipated expiration: 2032-12-28

Abstract

The utility model discloses an outer rotor low-noise brushless motor, which comprises an outer rotor shell and a stator core, wherein a plurality of magnetic steels are uniformly distributed on the inner peripheral surface of the outer rotor shell along the circumferential direction, the stator core is positioned in the center of the outer rotor shell, and the inner end surfaces of the magnetic steels opposite to the stator core are planes. The inner end face of the magnetic steel on the outer rotor shell is set to be a plane, the magnetic field of the magnetic steel is close to sine wave, the magnetic steel is matched with the stator core, when the motor works, the cut-in air gap difference between the magnetic steel and the stator core can be increased under the premise of ensuring power output in the rotating process of the outer rotor, the magnetic field change of the stator core is enabled to be more stable, the magnetic circuit of the magnetic field is enabled to be more optimized, and therefore electromagnetic noise of the motor can be effectively reduced, and motor noise is further reduced.

Description

Outer rotor low noise brushless motor

Technical Field

The utility model relates to the technical field of motors, in particular to an outer rotor low-noise brushless motor.

Background

The brushless motor has the advantages of high efficiency, stable operation and the like, and is widely applied to various fields such as aerospace, medical appliances, household appliances, electric vehicles and the like. The brushless motor mainly comprises a rotor with permanent magnets, a multipolar winding stator, a position sensor and the like. The outer rotor motor is a motor with a rotor arranged on the periphery of a stator, permanent magnets are arranged on the outer rotor, magnetic steel on the existing outer rotor motor is of a tile-shaped structure generally, the inner end face of the magnetic steel opposite to a stator core is an arc-shaped face (shown in figure 1), and the advantage of adopting the structure is that the gap between the magnetic steel 1 and the stator core 2 can be kept unchanged, so that the working condition of the motor is stable. However, the motor adopting the structure has certain defects, because the gap between the magnetic steel 1 and the stator core 2 is directly related to the output power of the motor, in order to improve the output power of the motor, the gap between the magnetic steel 1 and the stator core 2 is often smaller, but if the gap between the magnetic steel and the stator is too small, the electromagnetic noise is larger when the gap is switched in the rotating process of the motor. With the application of the motor in the fields of electric automobiles, household appliances and the like, the requirements of people on motor noise are higher and higher, so that the existing motor structure is required to be further improved so as to further reduce the motor noise.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model aims to develop a conveying device capable of realizing the steering of a lithium battery cell in the conveying process.

The utility model provides an external rotor low noise brushless motor, includes external rotor casing and stator core, evenly distributed is provided with a plurality of magnet steel along the circumferencial direction on the inner peripheral surface of external rotor casing, stator core is located the center of external rotor casing, the magnet steel with the interior terminal surface that stator core is relative is the plane.

Preferably, two ends of the magnetic steel are provided with arc transition parts.

Preferably, the stator core is formed by stacking a plurality of stator punching sheets, the stator punching sheets comprise annular yokes, a plurality of stator teeth which are uniformly distributed along the circumferential direction are arranged on the annular yokes, stator grooves are formed between adjacent stator teeth, stator pole shoes are arranged at the ends of the stator teeth which are far away from the annular yokes, the end faces of the stator pole shoes comprise a power output section and two magnetic steel cutting sections, the two magnetic steel cutting sections are symmetrically arranged at two ends of the power output section, the outer end faces of the power output section are planes, and the magnetic steel cutting sections form inclined planes which are at a certain angle with the power output section and extend inwards.

Preferably, the included angle between the magnetic steel cut-in section and the power output section is 160-170 degrees.

Preferably, the included angle between the magnetic steel cut-in section and the power output section is 165 degrees.

Preferably, the outer end part of the magnetic steel cut-in section is an arc-shaped surface.

The technical scheme has the following beneficial effects: the inner end face of the magnetic steel on the outer rotor shell is set to be a plane, the magnetic field of the magnetic steel is close to sine wave, the magnetic steel is matched with the stator core, when the motor works, the cut-in air gap difference between the magnetic steel and the stator core can be increased under the premise of ensuring power output in the rotating process of the outer rotor, the magnetic field change of the stator core is enabled to be more stable, the magnetic circuit of the magnetic field is enabled to be more optimized, and therefore electromagnetic noise of the motor can be effectively reduced, and motor noise is further reduced.

Drawings

Fig. 1 is a schematic structural diagram of a magnetic steel and a stator core of a conventional motor.

Fig. 2 is a schematic structural diagram of an embodiment of the present utility model.

Fig. 3 is a schematic structural diagram of a motor magnetic steel and a stator core according to an embodiment of the present utility model.

Fig. 4 is a schematic diagram of a magnetic field of a motor magnetic steel according to an embodiment of the present utility model.

Fig. 5 is a schematic structural view of a stator lamination according to an embodiment of the present utility model.

Fig. 6 is a schematic structural view of a stator lamination pole piece in accordance with an embodiment of the present utility model.

Description of element numbers: 1. Magnetic steel; 11. an inner end surface; 12. a transition section; 2. a stator core; 21. pole shoes; 211. a power output section; 212. a magnetic steel cutting section; 213. an arc surface; 22. stator teeth; 23. an annular yoke; 3. an outer rotor case.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the utility model. One skilled in the relevant art will recognize, however, that the utility model may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known aspects have not been shown or described in detail to avoid obscuring aspects of the utility model.

As shown in fig. 2 and 3, the utility model discloses an outer rotor low noise brushless motor, which comprises an outer rotor shell 3 and a stator core 2, wherein a plurality of magnetic steels 1 are uniformly distributed on the inner peripheral surface of the outer rotor shell 3 along the circumferential direction, the stator core 2 is positioned at the central position of the outer rotor shell 3, a coil is arranged on the stator core 2, and the outer rotor shell 3 is driven to rotate along with the change of a magnetic field after the coil is electrified.

The inner end face 21 of the stator core 2 opposite to the stator core 2 on the brushless motor is a plane, and two ends of the magnetic steel are provided with arc-shaped transition parts 12. The magnetic steel with the structure has a sine wave structure (shown in fig. 4) in the magnetic field, and the inner end surface of the magnetic steel is set to be a plane, so that the cut-in air gap difference between the magnetic steel 1 and the stator core 2 can be increased in the rotating process of the outer rotor, for example, the air gap at the position b2 in fig. 3 is obviously larger than the air gap at the position b1, the magnetic field change of the stator core 2 can be more stable in the mode, the magnetic circuit of the magnetic field is more optimized, the electromagnetic noise of the motor can be effectively reduced, and the noise of the motor can be further reduced.

As shown in fig. 5 and 6, in order to achieve a better noise reduction effect, as a preferred embodiment of the present patent, the stator core 2 in the present patent is formed by stacking a plurality of stator punching sheets, the stator punching sheet structure of the motor includes an annular yoke portion 23, a plurality of stator teeth 22 uniformly distributed along the circumferential direction are provided on the annular yoke portion 23, stator slots are formed between adjacent stator teeth, stator pole shoes 21 are provided at ends of the stator teeth far away from the annular yoke portion 23, end surfaces of the stator pole shoes include a power output section 211, magnetic steel cut-in sections 212 are formed at two sides of the power output section 211, the two magnetic steel cut-in sections 212 are symmetrically arranged at two ends of the power output section 211, an outer end surface of the power output section 211 is a plane, and the magnetic steel cut-in sections 212 form a certain angle with the power output section and are inclined planes extending inwards. That is to say that the power output section 21 projects outwards with respect to the two-sided magnetic steel cut-in sections 22.

As a specific embodiment, the angle of the magnetic steel cut-in section 212 is in the range of 160 ° to 170 ° with the power output section 211, and as a preferred mode, the angle of the magnetic steel cut-in section 212 is 165 ° with the power output section 211, and under the premise of ensuring the output power of the motor, the electromagnetic noise of the motor is minimum. To even out the cut-in air gap transition, the outer end 213 of the magnetic steel cut-in 212 may be configured as an arcuate surface.

As shown in FIG. 3, the stator punching structure can further enlarge the gap cut into the air gap b2, so that the commutation vibration generated when each stator tooth is switched between magnetic steels can be further reduced, and the electromagnetic noise of the motor is reduced. When the power output section 211 cuts into the magnetic steel, a small gap is reserved between the stator punching sheet and the magnetic steel, so that the output power of the motor can be effectively ensured.

The inner end face of the magnetic steel on the outer rotor shell is set to be a plane, the magnetic field of the magnetic steel is close to sine wave, the magnetic steel is matched with the stator core, when the motor works, the cut-in air gap difference between the magnetic steel and the stator core can be increased under the premise of ensuring power output in the rotating process of the outer rotor, the magnetic field change of the stator core is enabled to be more stable, the magnetic circuit of the magnetic field is enabled to be more optimized, and therefore electromagnetic noise of the motor can be effectively reduced, and motor noise is further reduced.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims

1. The utility model provides an external rotor low noise brushless motor, includes external rotor casing and stator core, evenly distributed is provided with a plurality of magnet steel along circumferencial direction on the inner peripheral surface of external rotor casing, stator core is located the central authorities of external rotor casing, its characterized in that: the inner end surface of the magnetic steel, which is opposite to the stator core, is a plane.

2. The external rotor low noise brushless motor of claim 1, wherein: and arc transition parts are arranged at two ends of the magnetic steel.

3. The external rotor low noise brushless motor of claim 1, wherein: the stator core is formed by stacking a plurality of stator punching sheets, the stator punching sheets comprise annular yokes, a plurality of stator teeth which are uniformly distributed along the circumferential direction are arranged on the annular yokes, stator grooves are formed between adjacent stator teeth, stator pole shoes are arranged at the end parts of the stator teeth which are far away from the annular yokes, each end face of each stator pole shoe comprises a power output section and two magnetic steel cutting-in sections, the two magnetic steel cutting-in sections are symmetrically arranged at two ends of each power output section, the outer end faces of each power output section are planes, and each magnetic steel cutting-in section forms an inclined plane which is at a certain angle with the corresponding power output section and extends inwards.

4. The outer rotor low noise brushless motor of claim 3, wherein: and an included angle between the magnetic steel cut-in section and the power output section is 160-170 degrees.

5. The outer rotor low noise brushless motor of claim 4, wherein: and an included angle between the magnetic steel cut-in section and the power output section is 165 degrees.

6. The outer rotor low noise brushless motor of claim 3, wherein: the outer end part of the magnetic steel cut-in section is an arc-shaped surface.