CN113675961A

CN113675961A - Brushless Motor

Info

Publication number: CN113675961A
Application number: CN202111017329.5A
Authority: CN
Inventors: 刘述亮
Original assignee: Shenzhen Diju Intelligent Technology Co ltd
Current assignee: Shenzhen Action Yuan Intelligent Equipment Co.,Ltd.
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2021-11-19

Abstract

The application provides a brushless motor, comprising: a rotor having a rotating shaft, the extending direction of the rotating shaft being a first direction; a stator forming a first accommodating space inside, the rotor being rotatably connected to the stator, and The rotor is at least partially located in the first accommodating space; the length of the stator in the second direction is greater than the length of the stator in the third direction; wherein, the second direction and the first All three directions are perpendicular to the first direction, and the second direction is perpendicular to the third direction. The brushless motor can meet the space requirements in the third direction when the space is limited in the third direction, and can also keep the diameter of the rotor in a maximum state, so that the brushless motor can meet the space requirements in one direction when the space is limited. It still has a higher output torque, and thus achieves a higher output power at the same speed.

Description

Brushless motor

Technical Field

The application belongs to the technical field of motors, and particularly relates to a brushless motor.

Background

The brushless motor is composed of a motor main body and a driver, and is a typical electromechanical integration product. Because the brushless motor runs in a self-control mode, a starting winding is not additionally arranged on a rotor like a synchronous motor which is started under the condition of heavy load under the condition of variable frequency speed regulation, and oscillation and step-out can not be generated when the load suddenly changes, so that the brushless motor has a wide application range. Brushless motors are usually arranged in a cylindrical shape, and in some positions with limited space in one direction, the brushless motor with the radius meeting the limited space is usually adopted, but the situation that the torque is too low due to the fact that the diameter of the rotor is too small is often caused.

Disclosure of Invention

An object of the embodiments of the present application is to provide a brushless motor to solve the technical problem that the brushless motor in the prior art is forced to adopt a rotor with an excessively small diameter in order to be installed in a limited space in one direction.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

provided is a brushless motor including: the rotor is provided with a rotating shaft, and the extending direction of the rotating shaft is a first direction; the stator forms a first accommodating space inside, the rotor is rotatably connected with the stator, and at least part of the rotor is positioned in the first accommodating space; the length of the stator in the second direction is greater than the length of the stator in the third direction; wherein the second direction and the third direction are both perpendicular to the first direction, and the second direction is perpendicular to the third direction.

In one embodiment, the stator includes: a housing having a second receiving space formed therein; a first permanent magnet fixed inside the second accommodating space and close to one side of the housing in the second direction; a second permanent magnet fixed inside the second accommodating space and adjacent to the other side of the housing opposite to the one side in the second direction; the first permanent magnet and the second permanent magnet form the first accommodating space therebetween.

In one embodiment, a distance between the first permanent magnet and the second permanent magnet is the same as a length of the stator in the third direction.

In one embodiment, the housing has a first surface located at one end of the housing in the second direction, the first surface is an arc surface, and an opening direction of the arc surface faces the first accommodating space.

In one embodiment, the housing has a second surface located at an end of the housing facing away from the first surface in the second direction, the second surface is an arc surface, and an opening of the arc surface faces the first accommodating space.

In one embodiment, the housing has a third surface located at one end of the housing in the third direction, and the third surface is a plane.

In one embodiment, the housing has a fourth surface at an end of the housing facing away from the third surface in the third direction, the fourth surface being planar.

In one embodiment, further comprising: an encoder fixedly mounted to the stator; the rotor includes a coil, and the encoder is electrically connected to the coil to control a current direction of the coil.

In one embodiment, the encoder is fixedly mounted to one end of the stator in the first direction.

In one embodiment, the rotating shaft partially protrudes from the second accommodating space, and the portion of the rotating shaft protruding from the second accommodating space is located at an end of the stator facing away from the encoder.

The application provides a brushless motor's beneficial effect lies in: the brushless motor includes: a rotor and a stator; the rotor is provided with a rotating shaft, and the extending direction of the rotating shaft is a first direction, namely the rotor rotates around the first direction; the rotor is rotationally connected with the stator, a first accommodating space is formed inside the stator, and at least part of the rotor is positioned in the first accommodating space; the length of the stator in the second direction is greater than that of the stator in the third direction, wherein the second direction and the third direction are both perpendicular to the first direction, and the second direction is perpendicular to the third direction; because the length of stator in second direction and third direction is different, consequently under the limited circumstances in space in the third direction, the stator can have great length in the second direction, the diameter of rotor only need be slightly less than the stator length in the third direction this moment can, consequently this brushless motor can satisfy the space requirement in the third direction under the limited circumstances in third direction space, can also make the diameter of rotor keep the biggest state, thereby this brushless motor still has higher output torque under the limited circumstances in space in a direction, and then reach higher output under equal rotational speed.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of a brushless motor according to an embodiment of the present application;

fig. 2 is a cross-sectional view of a brushless motor according to an embodiment of the present application.

Wherein, in the figures, the respective reference numerals:

100. a brushless motor; 110. a rotor; 111. a rotating shaft; 112. a coil; 120. a stator; 121. a first surface; 122. a second surface; 123. a third surface; 124. a fourth surface; 125. a housing; 126. a first permanent magnet; 127. a second permanent magnet; 130. an encoder.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

The brushless motor provided in the embodiment of the present application will now be described.

As shown in fig. 1 and 2, the present application provides a brushless motor 100 including: a rotor 110 and a stator 120.

The rotor 110 has a rotation axis 111, and the rotation axis 111 extends in a first direction, i.e., the rotation direction of the rotation axis 111 is around the first direction. The rotor 110 further has a coil 112, and the coil 112 may be provided in plural, and the plural coils 112 are annularly distributed around the rotation axis 111.

The stator 120 has an inner portion forming a first receiving space in which the rotor 110 is at least partially positioned. The stator 120 is rotatably coupled to the rotor 110, and in particular, the rotor 110 rotates in a first direction in a first receiving space formed by the stator 120. The length of the stator 120 in the second direction is greater than the length of the stator 120 in the third direction, wherein the second direction and the third direction are perpendicular to the first direction, and the second direction is perpendicular to the third direction. I.e., the length of the stator 120 in the second direction is longer than the length of the stator 120 in the third direction. Since the stator 120 is shorter in length in the third direction, it can be installed in a space limited in the third direction; since the space of the stator 120 in the perpendicular direction to the third direction is not limited, the length of the stator 120 in the second direction is longer, and more structures of the stator 120 can be installed in the second direction.

The stator 120 may include a housing 125, a first permanent magnet 126, and a second permanent magnet 127. The housing 125 may form a second accommodating space, and both the first permanent magnet 126 and the second permanent magnet 127 may be disposed in the second accommodating space of the housing 125. The length of the housing 125 in the second direction is greater than the length of the housing 125 in the third direction, so that the first permanent magnet 126 may be mounted at one end of the stator 120 in the second direction, the second permanent magnet 127 may be mounted at the other end of the stator 120 opposite to the one end in the second direction, and a first receiving space may be formed between the first permanent magnet 126 and the second permanent magnet 127. The length of the first accommodating space in the second direction is determined by the distance between the first permanent magnet 126 and the second permanent magnet 127, and the length of the first accommodating space in the third direction is determined by the length of the second accommodating space in the third direction, and since the length of the first accommodating space in the third direction is limited, the distance between the first permanent magnet 126 and the second permanent magnet 127 needs to be greater than or equal to the length of the first accommodating space in the second direction in order to secure the volume of the first accommodating space. The diameter of the rotor 110 is determined according to the diameter of the first receiving space, and the diameter of the first receiving space is determined by the length of the first receiving space in the third direction, so in the brushless motor 100, the diameter of the first receiving space is the diameter of the housing 125 in the third direction minus the thickness of the housing 125, and since the thickness of the housing 125 can be made thin, the diameter of the first receiving space can be maximized under the condition that the space in the third direction is limited, thereby ensuring that the diameter of the rotor 110 is maximized.

The brushless motor 100 includes: a rotor 110 and a stator 120; the rotor 110 has a rotating shaft 111, and the extending direction of the rotating shaft 111 is a first direction, i.e. the rotor 110 rotates around the first direction; the rotor 110 is rotatably connected to the stator 120, a first accommodating space is formed inside the stator 120, and the rotor 110 is at least partially located in the first accommodating space; the length of the stator 120 in the second direction is greater than the length of the stator 120 in the third direction, wherein the second direction and the third direction are both perpendicular to the first direction, and the second direction is perpendicular to the third direction; because the lengths of the stator 120 in the second direction and the third direction are different, under the condition that the space in the third direction is limited, the stator 120 may have a larger length in the second direction, and at this time, the diameter of the rotor 110 only needs to be slightly smaller than the length of the stator 120 in the third direction, so that the brushless motor 100 may meet the space requirement in the third direction under the condition that the space in the third direction is limited, and the diameter of the rotor 110 may also be kept in a maximum state, so that the brushless motor 100 still has a higher output torque under the condition that the space in one direction is limited, and further reaches a higher output power under the same rotating speed.

In some embodiments of the present application, the first permanent magnet 126 is fixedly attached to the housing 125. Specifically, the first permanent magnet 126 may be fixedly connected to the housing 125 by bonding, welding, or the like, so as to ensure the connection strength between the two; or may be fixedly connected to the housing 125 by a fastener, a screw, or the like, so as to facilitate the assembly and disassembly. The second permanent magnet 127 is also fixedly attached to the housing 125. Specifically, the second permanent magnet 127 may be fixedly connected to the housing 125 by bonding, welding, or the like, so as to ensure the connection strength between the two; or may be fixedly connected to the housing 125 by a fastener, a screw, or the like, so as to facilitate the assembly and disassembly.

In some embodiments of the present application, the housing 125 has a first surface 121, and the first surface 121 is located at one end of the housing 125 in the second direction. The first surface 121 is an arc surface, and an opening of the arc surface faces the first accommodating space. Specifically, under the condition that the first surface 121 is an arc surface, an inner wall of the first accommodating space opposite to the first surface 121 may also be an arc surface, and in this case, the first permanent magnet 126 may be attached to the inner wall of the first accommodating space, and under the condition that the first accommodating space is ensured to accommodate the first permanent magnet 126, it may be further ensured that the space occupied by the whole housing 125 is small.

In some embodiments of the present application, the housing 125 has a second surface 122, and the second surface 122 is located at an end of the housing 125 facing away from the first surface 121 in the second direction. The second surface 122 is a cambered surface, and an opening of the cambered surface faces the second accommodating space. Specifically, under the condition that the second surface 122 is an arc surface, the inner wall of the first accommodating space opposite to the second surface 122 may also be an arc surface, and in this case, the second permanent magnet 127 may be attached to the inner wall of the first accommodating space, so that the space occupied by the whole casing 125 may be ensured to be smaller under the condition that the first accommodating space is ensured to accommodate the second permanent magnet 127.

In some embodiments of the present application, the shell 125 has a third surface 123, the third surface 123 is located at one end of the shell 125 in the third direction, and the third surface 123 is a plane. Specifically, one side of the third surface 123 is connected to the first surface 121, and the other side of the third surface 123 is connected to the second surface 122. The third surface 123 is a plane, so that the housing 125 can have a sufficient width to accommodate the first permanent magnet 126 and the second permanent magnet 127 when the space in the third direction is limited.

In some embodiments of the present application, the shell 125 has a fourth surface 124, the fourth surface 124 is located at an end of the shell 125 facing away from the third surface 123 in the third direction, and the fourth surface 124 is a plane. Specifically, one side of the fourth surface 124 is connected to the first surface 121, and the other side of the fourth surface 124 is connected to the second surface 122. The fourth surface 124 is a plane, so that the housing 125 can be ensured to have a sufficient width to accommodate the first permanent magnet 126 and the second permanent magnet 127 under the condition that the space of the housing 125 in the third direction is limited.

In some embodiments of the present application, the brushless motor 100 further includes: an encoder 130.

The encoder 130 is fixedly installed on the stator 120, and the stator 120 is used to support the encoder 130. The encoder 130 is electrically connected to the coil 112, and the current mode of the coil 112 can be controlled by the encoder 130, so that the rotor 110 can be driven by the electromagnetic force to rotate continuously.

In some embodiments of the present application, the encoder 130 is fixedly installed at one end of the stator 120 in the first direction. Since the space in the first direction is not limited, the brushless motor 100 may satisfy that the encoder 130 is installed in a sufficient space in a case where the third direction is limited.

In some embodiments of the present application, the rotating shaft 111 partially protrudes from the second accommodating space, and the portion of the rotating shaft 111 protruding from the second accommodating space is located at an end of the stator 120 facing away from the encoder 130 in the first direction. Since the space in the first direction is not limited, the brushless motor 100 can satisfy the condition that the space output power is still enough under the condition that the third direction is limited.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A brushless motor, comprising:

the rotor is provided with a rotating shaft, and the extending direction of the rotating shaft is a first direction;

the stator forms a first accommodating space inside, the rotor is rotatably connected with the stator, and at least part of the rotor is positioned in the first accommodating space; the length of the stator in the second direction is greater than the length of the stator in the third direction;

wherein the second direction and the third direction are both perpendicular to the first direction, and the second direction is perpendicular to the third direction.

2. The brushless electric machine of claim 1, wherein the stator comprises:

a housing having a second receiving space formed therein;

a first permanent magnet fixed inside the second accommodating space and close to one side of the housing in the second direction;

a second permanent magnet fixed inside the second accommodating space and adjacent to the other side of the housing opposite to the one side in the second direction;

the first permanent magnet and the second permanent magnet form the first accommodating space therebetween.

3. The brushless electric machine of claim 2, wherein a distance between the first permanent magnet and the second permanent magnet is the same as a length of the stator in the third direction.

4. The brushless motor according to claim 2, wherein the housing has a first surface at an end of the housing in the second direction, the first surface is an arc surface, and an opening direction of the arc surface is toward the first accommodation space.

5. The brushless motor of claim 4, wherein the housing has a second surface at an end of the housing facing away from the first surface in the second direction, the second surface is an arc surface, and an opening of the arc surface faces the first accommodation space.

6. The brushless motor of claim 3, 4 or 5, wherein the housing has a third surface at an end of the housing in the third direction, the third surface being a plane.

7. The brushless electric machine of claim 6, wherein the housing has a fourth surface at an end of the housing facing away from the third surface in the third direction, the fourth surface being planar.

8. The brushless electric machine of claim 2, further comprising:

an encoder fixedly mounted to the stator; the rotor includes a coil, and the encoder is electrically connected to the coil to control a current direction of the coil.

9. The brushless electric machine of claim 8, wherein the encoder is fixedly mounted to an end of the stator in the first direction.

10. The brushless motor of claim 8, wherein the rotating shaft portion protrudes from the second accommodating space, and a portion of the rotating shaft that protrudes from the second accommodating space is located at an end of the stator that faces away from the encoder.