CN220653057U - Motor, fan and cleaning device - Google Patents

Abstract

The utility model provides a motor, a fan and a cleaning device. The motor comprises a stator core, a rotor, a magnetic ring and a connecting piece, wherein the rotor is arranged on the periphery of the stator core in a surrounding mode, the magnetic ring is arranged between the stator core and the rotor, a limiting surface is arranged on the connecting piece, the stator core limits the relative position between the stator core and the rotor through the limiting surface, and a height difference is formed between the limiting surface and the magnetic ring in the axial direction of the rotor. Therefore, the limit surface can limit the height difference between the stator core and the magnetic ring, and the saturation position of the core mainly appears on the end face and is caused by the end effect of the magnetic ring.

Description

Motor, fan and cleaning device

Technical Field

The utility model relates to the technical field of cleaning devices, in particular to a motor, a fan and a cleaning device.

Background

The motor includes a stator and a rotor rotatable relative to the stator. The stator generally includes a stator core, stator windings, and a base. The rotor is arranged on the periphery of the stator, and a magnetic ring is arranged between the rotor and the stator. The stator is used for generating a rotating magnetic field, and the rotor rotates under the action of the rotating magnetic field.

The existing motors, especially motors for cleaning devices, are limited by the installation space, which requires the motor to be as small as possible, however, the output power of the motor and the motor volume are interrelated, the smaller the volume, the smaller the maximum power output. How to increase the power of the motor without increasing the volume of the motor is always a problem that the cleaning device needs to overcome. Generally, in order to ensure the power requirement of the motor and meet the installation space requirement, the end face of the stator core and the end face of the magnetic ring are arranged in parallel. However, due to the arrangement, the stator core may be saturated due to the end effect of the magnetic ring, and the problem of heating of the tooth part of the stator core is aggravated, so that the efficiency of the motor is also affected.

Disclosure of Invention

In order to at least partially solve the problems of the prior art, according to one aspect of the present utility model, an electric machine is provided. The motor comprises a stator core, a rotor, a magnetic ring and a connecting piece, wherein the rotor is arranged on the periphery of the stator core in a surrounding mode, the magnetic ring is arranged between the stator core and the rotor, a limiting surface is arranged on the connecting piece, the stator core limits the relative position between the stator core and the rotor through the limiting surface, and a height difference is formed between the limiting surface and the magnetic ring in the axial direction of the rotor.

Illustratively, an air gap a is provided between the magnetic ring and the stator core in the radial direction of the rotor, a being 0.3mm-0.4mm.

Illustratively, the magnetic ring has a thickness b of 1.3mm-1.5mm.

Illustratively, the height difference is 0.85mm-1mm.

The rotor has a limit end face, and the magnetic ring has a first end face and a second end face, the first end face being fitted with the limit end face, the limit face being closer to the second end face than the first end face in an axial direction of the rotor.

The second end face and the limiting face have a distance in the axial direction of the rotor, which distance forms a height difference.

Illustratively, the stator core includes a plurality of silicon steel sheets stacked in an axial direction of the stator core, the thickness of the silicon steel sheets being 0.1mm to 0.2mm.

Illustratively, the outer diameter of the rotor is no greater than 27.5mm.

Illustratively, the height of the rotor in its axial direction is no greater than 11mm.

According to another aspect of the present utility model, there is also provided a blower. The fan comprises a shell, wherein any motor is arranged in the shell.

According to another aspect of the present utility model, there is also provided a cleaning device. The cleaning device comprises a machine body, wherein the fan is arranged in the machine body.

According to the motor provided by the utility model, the limit surface can limit the height difference between the stator core and the magnetic ring, and the saturation position of the core mainly appears on the end surface and is caused by the end effect of the magnetic ring.

In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description section. This summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

Advantages and features of the utility model are described in detail below with reference to the accompanying drawings.

Drawings

The following drawings are included to provide an understanding of the utility model and are incorporated in and constitute a part of this specification. Embodiments of the present utility model and their description are shown in the drawings to explain the principles of the utility model. In the drawings of which there are shown,

fig. 1 is a front view of an electric machine according to an exemplary embodiment of the present utility model;

FIG. 2 is a top view of an electric machine according to an exemplary embodiment of the present utility model;

FIG. 3 is a cross-sectional view of an electric machine according to an exemplary embodiment of the present utility model; and

fig. 4 is a partial enlarged view of the S portion in fig. 3.

Wherein the above figures include the following reference numerals:

100. a motor; 110. a stator core; 120. a rotor; 121. a limiting end face; 130. a magnetic ring; 131. a first end face; 132. a second end face; 140. a connecting piece; 141. a limiting surface; 142. a main body; 150. a base.

Detailed Description

In the following description, numerous details are provided to provide a thorough understanding of the utility model. However, it will be understood by those skilled in the art that the following description illustrates preferred embodiments of the utility model by way of example only and that the utility model may be practiced without one or more of these details. Furthermore, some technical features that are known in the art have not been described in detail in order to avoid obscuring the utility model.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the present utility model. It will be apparent that embodiments of the utility model may be practiced without limitation to the specific details that are set forth by those skilled in the art. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.

For an electric machine, in order to meet the use requirement, it is necessary to ensure a sufficient torque output, according to the motor torque formula: t=b×a×v, where T is the torque of the motor, B is the air-gap flux density, a is the electrical load, and V is the rotational speed, and as can be seen from the formula, when the high performance output of the motor is satisfied, it can be achieved by increasing the air-gap flux density B (i.e., the magnetic load) and the electrical load a. However, due to the limitation of the volume, when a larger electric load A is obtained, the problem of magnetic saturation is very easy to occur, the iron core is seriously heated, and the motor efficiency is reduced; when the larger air gap magnetic density B is obtained, the magnetic performance is too strong, and under the combined action of the end effect of the magnet, the magnetic saturation heating is easy to cause, and the motor efficiency is low.

The size and efficiency of the motor need to be balanced. Especially when applied to some small-sized devices, such as sweeping robots, washing robots and the like, the internal structural components are more complex and have limited space, the size requirement on the motor is higher, and the efficiency of the motor can greatly influence the cleaning efficiency of the motor. There is an urgent need for a motor that can meet higher motor efficiency with smaller motor sizes. The utility model aims to meet performance output by improving the magnetic load B and solve the problem of low efficiency caused by magnetic saturation of an iron core and other factors.

An embodiment of the present utility model provides a motor 100. Referring to fig. 1-4 in combination, the motor 100 may include a stator core 110, a rotor 120, a magnetic ring 130, and a connection 140. The rotor 120 may be disposed around the outer circumference of the stator core 110, and the rotor 120 may be rotatable with respect to the stator core 110. The magnetic ring 130 may be disposed between the stator core 110 and the rotor 120. The connection member 140 may be provided with a limiting surface 141, and the stator core 110 is disposed on the connection member 140. The connector 140 may be connected to the base 150. The stator core 110 may define a relative position with the rotor 120 by the limit surface 141, and may have a height difference in the axial direction of the rotor 120 by the limit surface 141 and the magnetic ring 130.

It will be appreciated that the stator core 110 and the rotor 120 are generally coaxially disposed, and that both the axial direction of the rotor 120 and the axial direction of the stator core 110 may refer to the direction X-X in fig. 3, and both the radial direction of the rotor 120 and the radial direction of the stator core 110 may refer to the direction Y-Y in fig. 3. The difference in height between the stator core 110 and the magnet ring 130 in the axial direction X-X of the rotor 120 may be referred to as c in fig. 3, which is the difference in height between the bottom of the magnet ring 130 and the bottom of the stator core 110. In the axial direction X-X, the magnetic ring 130 may completely cover the stator core 110, i.e., the top of the magnetic ring 130 is higher than the top of the stator core 110, and the bottom of the magnetic ring 130 is lower than the bottom of the stator core 110. That is, there may be a height difference m between the top of the magnetic ring 130 and the top of the stator core 110 in the axial direction X-X of the rotor 120. The height difference m may be equal to the height difference c.

The stator core 110 may be mounted to the connection member 140. Specifically, the connector 140 may include a main body 142, and the limiting surface 141 is connected to an outer circumference of the main body 142 and extends in a direction away from the main body 142. The stop surface 141 may extend in the direction Y-Y. The bottom of the stator core 110 abuts against the limiting surface 141, and the limiting surface 141 forms a limit to the stator core 110 in the axial direction X-X. The outer periphery of the body 142 abuts against the stator core 110 and forms a limit for the stator core 110 in the radial direction Y-Y.

According to the motor 100 provided by the utility model, the limit surface 141 can limit the height difference between the stator core 110 and the magnetic ring 130, and the saturation position of the core mainly appears on the end surface, which is caused by the end effect of the magnetic ring, so that the saturation problem of the stator core 110 can be solved, the tooth heating of the stator core 110 can be reduced, and the efficiency of the motor 100 can be improved without increasing the size of the motor 100.

Illustratively, referring to fig. 3, the magnetic ring 130 and the stator core 110 have an air gap a therebetween in the radial direction of the rotor 120, and a may be 0.3mm to 0.4mm. For example, the air gap a may be 0.3mm, 0.35mm, 0.4mm, etc. By the arrangement, on one hand, the magnetic resistance of the main magnetic circuit can be shortened, and the air gap density B of the motor can be improved. On the other hand, the problem of the sweeping of the bore or the like due to the too small interval between the stator core 110 and the rotor 120 can be avoided. The air gap a is lower than the air gap of the motor in the prior art, the sectional area of the stator core 110 is increased, and the saturation problem of the stator core 110 is better avoided.

Illustratively, with continued reference to FIG. 3, the magnetic ring 130 has a thickness b, which may be 1.3mm-1.5mm. For example, b may be 1.3mm, 1.4mm, 1.5mm, etc. It will be appreciated that as the thickness of the magnetic ring 130 increases, the resistance of the primary magnetic circuit correspondingly decreases and the air gap flux density B of the motor 100 correspondingly increases. However, after the thickness is increased to a certain extent, the air gap flux density B tends to be stable, the improvement is limited, and the economical efficiency is low. Also, in the case where the overall size of the motor 100 is unchanged, an excessive thickness may cause an air gap to be too small, resulting in a problem of sweeping a bore. The thickness of the magnetic ring 130 is set to be 1.3mm-1.5mm, so that the air gap flux density B of the motor 100 can be better improved, and the problems of sweeping a bore and the like can be avoided under the condition that the overall size of the motor 100 is not increased.

Illustratively, the height difference may be 0.85mm-1mm, e.g., the height difference may be 0.85mm,0.9mm,0.95mm,1mm, etc. As the motor has larger redundancy at other positions when the end part reaches the magnetic saturation point, the problem of end part saturation can be better solved through the arrangement of the height difference of 0.85mm-1mm.

Illustratively, the rotor 120 may have a limiting end surface 121, the magnetic ring 130 may have a first end surface 131 and a second end surface 132, and the first end surface 131 may be in abutment with the limiting end surface 121. In the axial direction X-X of the rotor 120, the limit surface 141 is closer to the second end surface 132 than the first end surface 131. Thus, the limiting end face 121 further limits the magnetic ring 130, and the structure is simpler and more reasonable.

Illustratively, the second end surface 132 and the stop surface 141 have a spacing in the axial direction X-X of the rotor 120 that forms a possible height difference c. The connecting piece 140 limits the stator core 110, the rotor 120 limits the magnetic ring 130, and the structural arrangement is more reasonable under the condition of ensuring the efficiency of the motor 100.

Illustratively, the stator core 110 may include a plurality of silicon steel sheets stacked in an axial direction X-X of the stator core, and the thickness of the silicon steel sheets may be 0.1mm to 0.2mm. For example, the thickness of the silicon steel sheet is 0.1mm, 0.15mm, 0.2mm, or the like. Eddy current loss may be affected due to the thickness of the silicon steel sheet. In the case of a stator having a certain size, i.e., a constant width of the silicon steel sheet, the greater the thickness of the silicon steel sheet, the greater the eddy current loss, the lower the efficiency of the motor 100. By setting the thickness of the silicon steel sheet to 0.1mm-0.2mm, the eddy current loss of the stator core 110 can be reduced, the silicon steel sheet is less prone to damage, and stacking arrangement is facilitated. Illustratively, the silicon steel sheet can be selected to be an imported brand iron core with less iron loss material.

Referring to table 1, there are shown measured values and simulation values of the efficiency of the motor 100 under different values and ranges when the variable parameters are the air gap a, the thickness b of the magnetic ring 130, the height difference c of the magnetic ring 130 and the stator core 110, and the thickness d of the silicon steel sheet. Among them, the larger the core loss is, the larger the influence on the efficiency of the motor 100, that is, the larger the core loss is, the lower the efficiency of the motor 100 is.

As can be seen from table 1: 1. the smaller the air gap length a (the larger the air gap diameter) is, the larger the flux linkage of the motor is, and the higher the electric output efficiency is, under the condition that the outer diameter of the motor is unchanged. 2. In the size range of the motor, the incremental influence of the air gap length a on the flux linkage is larger than the influence of the increase of the magnetic ring thickness b, and the incremental influence is an influence factor for mainly increasing the output efficiency of the motor. 3. In the size range of the motor, the height difference c between the magnetic ring and the stator core is preferably 0.85-1mm, the larger the height difference c is, the stator core teeth are saturated, the actual output magnetic linkage is less, and the output efficiency of the motor is lower. 4. The larger the laminated thickness d of the silicon steel sheets is, the larger the iron loss is, and the lower the output efficiency of the motor is.

TABLE 1

Illustratively, the outer diameter of the rotor 120 may be no greater than 27.5mm. It will be appreciated that the size of the motor 100 may place a limit on the power of the motor 100. The larger the size, the greater the maximum power that can be achieved. The use of motor 100 in a device may result in excessive space within the device due to the oversized motor 100 or may result in a larger device itself and higher cost. The motor 100 provided by the utility model can be smaller in size under the condition of ensuring the power, can be better applied to devices with higher size requirements, and is wider in application range and lower in cost. In particular, in the embodiment where the magnetic ring 130 has a thickness of 1.3mm-1.5mm and the air gap a is 0.3mm-0.4mm, the outer diameter of the rotor 120 may be made not greater than 27.5mm while the power of the motor 100 is better ensured.

Illustratively, the height of the rotor 120 in its axial direction X-X may be no greater than 11mm. The motor 100 provided by the utility model can be smaller in size under the condition of ensuring the power, can be better applied to devices with higher size requirements, and is wider in application range and lower in cost.

According to another aspect of the present utility model, there is also provided a blower. The blower may include a housing within which any of the motors 100 described above may be disposed. Because the motor 100 adopts the technical scheme of any one of the embodiments, the fan has at least the beneficial effects brought by the technical scheme of the embodiment. The fan provided with the motor 100 is more efficient. At the same input power, e.g. 50w, the work absorption can be increased by 30% (including aerodynamic efficiency). The heating problem and the energy consumption problem can be improved better. In addition, the fan may include impellers, bearings, and the like. The impeller, bearings, etc. may have various structures that may be present or may occur in the future, and do not constitute a limitation on the scope of the present utility model.

According to another aspect of the present utility model, there is also provided a cleaning device. The cleaning device may comprise a body. The fan can be arranged in the machine body. The cleaning device may be a sweeping robot, a washing and mopping integrated robot, a hand-held cleaner, or the like. The cleaning device having the blower can have a better cleaning effect because the motor 100 in the blower is more efficient.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front", "rear", "upper", "lower", "left", "right", "transverse", "vertical", "horizontal", and "top", "bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely for convenience of describing the present utility model and simplifying the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, without limiting the scope of protection of the present utility model; the orientation terms "inner" and "outer" refer to the inner and outer relative to the outline of the components themselves.

For ease of description, regional relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein to describe regional positional relationships of one or more components or features to other components or features illustrated in the figures. It will be understood that the relative terms of regions include not only the orientation of the components illustrated in the figures, but also different orientations in use or operation. For example, if the element in the figures is turned over entirely, elements "over" or "on" other elements or features would then be included in cases where the element is "under" or "beneath" the other elements or features. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". Moreover, these components or features may also be positioned at other different angles (e.g., rotated 90 degrees or other angles), and all such cases are intended to be encompassed herein.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, components, assemblies, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

The present utility model has been illustrated by the above-described embodiments, but it should be understood that the above-described embodiments are for purposes of illustration and description only and are not intended to limit the utility model to the embodiments described. In addition, it will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that many variations and modifications are possible in light of the teachings of the utility model, which variations and modifications are within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (11)

1. The motor is characterized by comprising a stator core, a rotor, a magnetic ring and a connecting piece, wherein the rotor is arranged on the periphery of the stator core in a surrounding mode, the magnetic ring is arranged between the stator core and the rotor, a limiting surface is arranged on the connecting piece, the stator core limits the relative position between the stator core and the rotor through the limiting surface, and a height difference exists between the limiting surface and the magnetic ring in the axial direction of the rotor.

2. The electric machine according to claim 1, characterized in that the magnetic ring and the stator core have an air gap a between them in the radial direction of the rotor, a being 0.3mm-0.4mm.

3. The electric machine of claim 1, wherein the magnetic ring has a thickness b of 1.3mm-1.5mm.

4. The electric machine of claim 1, wherein the height difference is 0.85mm-1mm.

5. The motor of claim 1, wherein the rotor has a limit end face, the magnetic ring has a first end face and a second end face, the first end face is in contact with the limit end face, and the limit face is closer to the second end face than the first end face in an axial direction of the rotor.

6. The motor of claim 5, wherein the second end face and the limit face have a pitch in an axial direction of the rotor, the pitch forming the height difference.

7. The motor of claim 1, wherein the stator core includes a plurality of silicon steel sheets stacked in an axial direction of the stator core, the silicon steel sheets having a thickness of 0.1mm to 0.2mm.

8. The electric machine of claim 1, wherein the outer diameter of the rotor is no greater than 27.5mm.

9. An electric machine according to claim 1, characterized in that the rotor has a height in its axial direction of not more than 11mm.

10. A fan comprising a housing in which the motor of any one of claims 1 to 9 is disposed.

11. A cleaning device comprising a body having the blower of claim 10 disposed therein.