CN219678218U - Radiating assembly, motor and washing machine - Google Patents

Abstract

The embodiment of the disclosure relates to a heat dissipation assembly, a motor and a washing machine. The heat dissipation assembly includes: the bracket of the motor rotor comprises a bracket surface and heat dissipation holes arranged on the bracket surface; the radiating fin is arranged in the radiating hole, and an included angle between the radiating fin and the frame surface is an acute angle or an obtuse angle; the gaps between the radiating fins and the radiating holes form radiating air channels; in this way, the heat dissipation rate can be increased.

Description

Radiating assembly, motor and washing machine

Technical Field

The disclosure relates to the technical field of electric appliances, in particular to a heat dissipation assembly, a motor and a washing machine.

Background

As shown in fig. 1 and 2, for a drum in a washing machine, a motor for driving the drum includes a motor rotor and a motor stator. Some types of machines have windings surrounded by a rotor, the heat generated by the windings requiring heat dissipation. In the related art, heat dissipation holes are usually formed in a supporting frame of a motor rotor to dissipate heat of a winding. The heat dissipation mode has lower heat dissipation efficiency.

There is a need for a heat dissipating assembly that increases the heat dissipation efficiency of a motor.

Disclosure of Invention

The embodiment of the disclosure provides a heat dissipation assembly, a motor and a washing machine.

A first aspect of the present disclosure provides a heat dissipating assembly comprising: the bracket of the motor rotor comprises a bracket surface and heat dissipation holes arranged on the bracket surface; the radiating fin is arranged in the radiating hole, and an included angle between the radiating fin and the frame surface is an acute angle or an obtuse angle; and the gaps between the radiating fins and the radiating holes form a radiating air channel.

Optionally, the heat sink includes: a first heat sink having a first inclined surface; and/or a second fin having a second inclined surface; wherein the first inclined surface and the second inclined surface are axisymmetrically arranged relative to the frame surface.

Optionally, the motor rotor is a bidirectional rotor; the first radiating fins and the second radiating fins are symmetrically distributed in one radiating hole; or the first radiating fins and the second radiating fins are distributed in different radiating holes in a staggered mode.

Optionally, the first inclined surface and the second inclined surface of the same fin are connected by ribs and are distributed axisymmetrically by the ribs.

Optionally, the motor rotor is a unidirectional rotor; the first inclined surface or the second inclined surface of the radiating fin in each radiating hole has the following inclined direction: from facing away from the shelf surface to being flush with the shelf surface.

Optionally, the heat sink further includes: the flow guiding plane is positioned at the end part of the radiating fin, which is far away from the frame surface.

Optionally, the first inclined surface is located at one side of the frame surface facing the motor stator; or extend on both sides of the frame surface; and/or the second inclined surface is positioned on one side of the frame surface facing the motor stator; or extend on both sides of the shelf surface.

Optionally, the heat dissipation assembly further includes: the retaining wall extends from the frame surface to a direction away from the frame surface.

A second aspect of the present disclosure provides an electric machine comprising: a motor rotor; a motor stator, on which a heating element is arranged; the heat dissipation assembly of the first aspect is fastened to the motor rotor, and is used for dissipating heat of the heating element.

Optionally, the heating element includes: windings wound on teeth of the motor stator; wherein teeth of the motor stator surrounded by the windings are opposite to magnets inside the motor rotor.

A third aspect of the present disclosure, comprising: a roller; a motor as described in the second aspect above connected to the drum, the motor being configured to drive the drum to rotate.

Embodiments of the present disclosure provide a heat dissipation assembly, comprising: the electric radiating fin is arranged in the radiating hole of the bracket of the motor rotor, and an included angle between the radiating fin and the bracket surface of the bracket is an acute angle or an obtuse angle; the gaps between the radiating fins and the radiating holes form radiating air channels, so that air generates heat exchange in the air channels; compared with the method that the radiating holes are only opened on the frame surface, in the embodiment of the disclosure, the radiating fins are inclined relative to the frame surface, so that strong heat convection can be formed in the air duct when the rotor rotates, and the radiating efficiency is improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.

FIG. 1 is a schematic diagram of a heat dissipating assembly according to an exemplary embodiment of the present disclosure;

FIG. 2 is a schematic structural view of a heat dissipating assembly according to an exemplary embodiment of the present disclosure;

FIG. 3 is a schematic diagram of a heat dissipating assembly according to an exemplary embodiment of the present disclosure;

FIG. 4 is a schematic structural view of a heat dissipating assembly according to an exemplary embodiment of the present disclosure;

FIG. 5 is a schematic diagram of a heat dissipating assembly according to an exemplary embodiment of the present disclosure;

fig. 6 is a schematic structural view of a heat dissipating assembly according to an exemplary embodiment of the present disclosure.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the utility model. Rather, they are merely examples of devices consistent with aspects of the utility model as detailed in the accompanying application.

Referring to fig. 3, 4, 5 and 6, in an embodiment of the present disclosure, there is provided a heat dissipating assembly 10 including:

a bracket 11 of the motor rotor 20, the bracket 11 including a bracket surface 111 and a heat radiation hole 112 provided on the bracket surface 111;

a heat sink 12 disposed in the heat dissipation hole 112, and an included angle between the heat sink 12 and the frame surface 111 is an acute angle or an obtuse angle;

wherein, the gap between the radiating fin 12 and the radiating hole 112 forms a radiating air channel 121.

In the embodiment of the disclosure, the motor rotor 20 is applied to a motor, and the motor may be an external rotor motor with some stators disposed inside the rotor, where the stators are disposed inside the rotor and require heat dissipation.

The motor rotor 20 may be a Direct Drive (DD) motor, for example.

The motor may be applied to any suitable appliance or mechanism requiring actuation, such as a drum washer, a sweeping robot, a robot dog, etc.

For heat dissipation of an external rotor motor as shown in fig. 1 or fig. 2, only the heat dissipation holes 112 are formed in the motor rotor support, so that heat flow in the rotor is dissipated through the heat dissipation holes. However, the heat dissipation efficiency is low because the heat dissipation holes 112 are difficult to cause forced convection.

In the embodiment of the present disclosure, the heat sink 12 may be disposed in the heat dissipation hole 112, where an included angle between the heat sink 12 and the frame surface 111 is an acute angle or an obtuse angle, and in this case, the heat sink 12 is inclined with respect to the frame surface 111. Here, the included angle may be any suitable angle such as 30 °, 40 °, 50 °, 150 °, 140 °, 130 °.

Therefore, when the motor rotor 20 drives the bracket 11 to rotate, heat flow in the bracket 11 and cold flow convection outside the bracket 11 are induced due to the inclination of the radiating fins 12, so that the radiating efficiency can be improved.

Alternatively, the heat sink 12 is inclined with respect to the frame surface 111, so that a gap is formed between the heat sink 12 and the heat dissipation hole 112, and a heat dissipation air duct 121 is formed. The air duct 121 is used for outputting heat flow in the bracket 11 along the air duct 121, and cold flow outside the bracket 11 enters the bracket 11 along the air duct 121.

Thereby, the air in the air duct 121 is subjected to heat convection, and the heat dissipation and the temperature reduction of the motor stator in the motor rotor are achieved.

In some embodiments, the heat sink 12 may be an integrally formed metal sheet, for example, it may be: the heat sink 12 has a good heat dissipation performance due to the metal sheet made of aluminum alloy, iron, aluminum and the like.

Alternatively, there is a direction of rotation when the motor rotor 20 rotates. The inclination direction of the heat sink 12 is at least from the direction away from the rotation direction to the direction inclined or extending in the bracket 11, so that when the motor rotor 20 rotates in the rotation direction, the heat flow in the bracket 11 is output in the same direction as the rotation direction due to the heat sink 12, and heat convection occurs with the cold flow outside the bracket 11.

In this way, the heat dissipation air duct 121 formed by the heat dissipation fins 12 inclined with respect to the frame surface 111 induces forced heat convection when the motor rotor 20 rotates, thereby improving heat dissipation efficiency.

As shown in fig. 3, 4, 5, and 6, in an embodiment of the disclosure, the heat sink 12 includes:

a first fin having a first inclined surface 122;

and/or the number of the groups of groups,

a second heat sink having a second inclined surface 123;

wherein the first inclined surface 122 and the second inclined surface 123 are axially symmetrically disposed with respect to the shelf surface 111.

Here, the shelf surface 111 may be circular, and the first inclined surface 122 and the second inclined surface 123 may be axisymmetrically disposed with respect to one axis of the shelf surface 111.

Alternatively, the first inclined surface 122 and the second inclined surface 123 are disposed in the heat dissipation hole 112 of the mount surface 111 with axial symmetry.

In the embodiment of the disclosure, the included angle of the first inclined surface 122 inclined with respect to the frame surface 111 and the included angle of the second inclined surface 123 inclined with respect to the frame surface 111 are equal or unequal.

In some embodiments, the heat sink 12 may set an inclination direction of the inclined surface according to a rotatable direction of the motor rotor 20.

In some embodiments, the heat sink 12 may have only the first inclined surface 122 or only the second inclined surface 123; alternatively, the heat sink 12 is composed of a first inclined surface 122 and a second inclined surface 123. The heat sink 12 is disposed with respect to an inclined surface, and is related to a rotatable direction of the motor rotor 20.

For example, if the rotatable direction of the motor rotor 20 is the first rotation direction, the portion of the first inclined surface 122 located in the bracket 11 may be inclined at an acute angle with respect to the first rotation direction when the motor rotor 20 rotates. Here, the first rotation direction is a counterclockwise direction.

In this way, when the motor rotor 20 rotates in the first rotation direction, the cold flow outside the bracket 11 and the hot flow inside the bracket 11 are convected along the first inclined surface 122, so as to dissipate heat from the heating element inside the bracket 11.

If the rotatable direction of the motor rotor 20 is the second rotation direction, the portion of the second inclined surface 123 located in the bracket 11 is inclined at an acute angle with respect to the second rotation direction when the motor rotor 20 rotates. Here, the second rotation direction may be opposite to the first rotation direction, and the second rotation direction may be a clockwise direction.

In this way, when the motor rotor 20 rotates in the second rotation direction, the cold flow outside the bracket 11 and the hot flow inside the bracket 11 send convection along the second inclined plane 123, so as to dissipate heat from the heating element inside the bracket 11.

In this way, by adjusting the angle between the direction in which the heat sink 12 is inclined with respect to the mount surface 111 and the rotation direction, the heat flow in the mount 11 and the cold flow outside the mount 11 are caused to be convected.

Referring to fig. 3, 4, 5 and 6, in an embodiment of the disclosure, the motor rotor 20 is a bi-directional rotor;

one of the first heat sink and one of the second heat sink are symmetrically disposed within one of the heat dissipation holes 112. Alternatively, the first heat sink and the second heat sink are alternately arranged in different heat dissipating holes 112.

In the embodiment of the present disclosure, if the motor rotor 20 is a bi-directional rotor, the motor rotor 20 may rotate counterclockwise or clockwise, and the first inclined surface 122 and the second inclined surface 123 having different inclined directions may be provided.

In some embodiments, a first heat sink having a first inclined surface 122 and a second heat sink having a second inclined surface 123 may be disposed within the same heat sink 112. Different fins having different inclined surfaces may also be provided in different adjacent heat dissipating holes 112.

In this way, for a bi-directional rotor, a bi-directional heat sink may be provided to facilitate heat dissipation in different rotational directions.

In some embodiments, the first heat sink and the second heat sink located in the same heat sink 112 may be integrally formed, so as to have better mechanical properties.

In other embodiments, the first fin and the second fin in the same heat dissipation hole 112 may be connected by the rib 124, and are axisymmetrically distributed with respect to the rib 124.

Here, the ribs 124 may enhance the mechanical properties of the heat sink 12.

In some embodiments, fins having only one slope may be disposed within adjacent different heat dissipating holes 112.

For example, a first fin is provided in an n-th adjacent heat dissipation hole, and a second fin is provided in an n+1-th adjacent heat dissipation hole. Here, n may be any suitable value of 5, 6, 7, 8, 9, 10, etc.

For example, a first fin is provided in the 1 st heat sink, a second fin is provided in the 2 nd heat sink, a first fin is provided in the 3 rd heat sink, and a second fin is provided in the 4 th heat sink. By analogy, embodiments of the present disclosure are not limited to the examples described above.

In some embodiments, the ratio of the first heat sink and the second heat sink may be determined according to a switching frequency of a rotational direction of the motor rotor.

For example, if the first rotation direction of the motor rotor requires the first heat sink to dissipate heat, the second rotation direction requires the second heat sink to dissipate heat; if the ratio of the time for switching the motor rotor to the first rotation direction to the time for switching the motor rotor to the second rotation direction is a to b, the ratio of the number of the first cooling fins to the number of the second cooling fins may be a to b. Here, a and b are both positive integers.

The first cooling fin may be disposed in every a×k cooling holes, and the second cooling fin may be disposed in every b×k adjacent cooling holes. The k may be any suitable value of 1, 2, 3, etc.

For example, if a is 2, b is 1, and k is 1, a first fin may be provided in each 2 heat dissipation holes, and a second fin may be provided in the adjacent 1 heat dissipation hole.

For another example, if a is 3, b is 2, and k is 1, a first fin may be provided in every 3 heat dissipation holes, and a second fin may be provided in 2 adjacent heat dissipation holes.

For another example, if a is 3, b is 2, and k is 2, the first fin may be installed in every 6 heat dissipation holes, and the second fin may be installed in the adjacent 4 heat dissipation holes. By analogy, embodiments of the present disclosure are not limited to the examples described above.

Therefore, the number of the first radiating fins and the second radiating fins can be determined according to the switching frequency of the rotating direction of the motor rotor, and accordingly the first radiating fins and the second radiating fins with proper numbers can be reasonably and correspondingly arranged, and the radiating efficiency is accurately improved.

Referring to fig. 3, 4, 5 and 6, in the embodiment of the disclosure, the first inclined surface 122 and the second inclined surface 123 of the same fin 112 are connected by the ribs 124 and are symmetrically distributed with the ribs 124 as an axis.

In the embodiment of the disclosure, the ribs 124 protrude toward the outer side of the bracket 11 with respect to the bracket surface 111, so that the heat flow coming out of the air duct of the first inclined surface 122 can be blocked from entering the air duct of the second inclined surface 123; alternatively, the heat flow from the air channel of the second inclined surface 123 may be blocked from entering the air channel of the first inclined surface 122.

In this way, the heat flow can be blocked by the ribs 124 and can again flow back into the interior of the support 11.

Referring to fig. 3, 4, 5 and 6, in an embodiment of the disclosure, the motor rotor 20 is a unidirectional rotor; the first inclined surface 122 or the second inclined surface 123 of the fin 12 in each of the heat dissipation holes 112 has an inclination direction of: from facing away from the shelf 111 to being flush with the shelf 111.

In some embodiments, the heat sink 12 is located within the frame 11 at a position facing away from the frame surface 111.

If the motor rotor 20 is a unidirectional rotor, the unidirectional rotor rotates in the first rotational direction or the second rotational direction.

For example, if the unidirectional rotor rotates counterclockwise in a first rotational direction, the heat sink 12 may include a first inclined surface 122, and the inclined direction of the first inclined surface 122 may form an acute angle with the first rotational direction when the motor rotor rotates.

Similarly, for example, if the unidirectional rotor rotates clockwise in a second rotational direction, the heat sink 12 may include a second inclined surface 123, and the inclined direction of the second inclined surface 123 may form an acute angle with the second rotational direction when the motor rotor rotates.

In this way, when the unidirectional rotor rotates, the unidirectional rotation direction is opposite to the direction of cold flow of the cooling fin 12 entering the bracket 11, and the direction of hot flow flowing out of the bracket 11 is the same, so that forced convection is realized.

As shown in fig. 3, 4, 5, and 6, in an embodiment of the disclosure, the heat sink 12 further includes:

a deflector plane 125 is located at the end of the fin 12 remote from the mount surface 111.

In the embodiment of the disclosure, the end of the heat sink 12 away from the frame surface 111 is close to the motor stator inside the bracket 11. When a heating element, such as a winding, on the stator of the motor heats, heat flow near the winding will flow along the flow guiding plane 125 to the first inclined surface 122 or the second inclined surface 123 of the heat sink 12.

And when the diversion plane 125 is parallel to the frame surface 111, the diversion effect is better.

The flow guiding plane 125 may be inclined toward the motor stator if the space inside the bracket 11 allows, so that the amount of flow guiding to the first inclined surface 122 or the second inclined surface 123 of the heat sink may be increased.

As shown in fig. 3, 4, 5 and 6, in the embodiment of the disclosure, the first inclined surface 122 is located on a side of the frame surface 111 facing the motor stator 30; or, extend on both sides of the shelf surface 111;

and/or the number of the groups of groups,

the second inclined surface 123 is located on a side of the frame surface 111 facing the motor stator 30; or extend on both sides of the shelf surface 111.

In the embodiment of the disclosure, the first inclined surface 122 may be located at the inner side of the bracket 11 to guide the heat flow out of the bracket 11.

Similarly, the second inclined surface 123 may be located inside the bracket 11 to guide the heat flow out of the bracket 11.

In some embodiments, to better direct the heat flow along the first inclined surface 122 or the second inclined surface 123, the first inclined surface 122 may be disposed at both sides of the shelf surface 111; or the second inclined surfaces 123 are provided on both sides of the shelf surface 111.

As such, heat flow may flow from the portion of the first inclined surface 122 inside the bracket 11 to the portion of the first inclined surface 123 outside the bracket 11; alternatively, the heat flow may flow from the portion of the second inclined surface 123 inside the bracket 11 to the portion of the second inclined surface 123 outside the bracket 11.

In some embodiments, when the motor rotor 20 is a bi-directional rotor, the first inclined surface 122 is located at both sides of the frame surface 111, the second inclined surface 123 is located at both sides of the frame surface 111, and the first inclined surface 122 and the second inclined surface 123 are connected by the rib 124, the first inclined surface 122 intersects the second inclined surface 123.

A first vent may be provided at the intersection of the first inclined surface 122 with the second inclined surface 123 to facilitate the passage of heat flow on the second inclined surface 123; alternatively, a second ventilation opening is provided at the intersection of the second inclined surface 123 and the first inclined surface 122, so that the heat flow on the first inclined surface 122 can pass through.

Therefore, the flow guide length of the inclined plane can be prolonged, and the heat flow can pass through conveniently.

As shown in fig. 3, 4, 5, and 6, in an embodiment of the disclosure, the heat dissipation assembly 10 further includes:

a retaining wall 13, wherein the retaining wall 13 extends from the frame surface 111 to a direction away from the frame surface 111.

In the embodiment of the present disclosure, the retaining wall 13 may be connected to an inclined surface of the heat sink 12 inside the bracket.

Alternatively, when the fluid is thermally convected along the inclined surfaces of the heat sink 12, the fluid in the air duct 121 does not flow toward both sides of the heat sink 12 due to the shielding of the blocking wall 13 on both sides of the heat sink 12.

In this way, the convection flow rate and convection intensity can be increased.

As shown in conjunction with fig. 3, 4, 5, and 6, in an embodiment of the present disclosure, there is provided a motor 40 including:

a motor rotor 20;

a motor stator 30, wherein a heating element 41 is arranged on the motor stator 30;

as in the heat dissipation assembly 10 of the above embodiment, the heat dissipation assembly 10 is fastened to the motor rotor 20 for heat dissipation of the heating element 41.

As shown in fig. 3, 4, 5 and 6, in an embodiment of the disclosure, the heating element 41 includes:

windings wound on the teeth 31 of the motor stator 30; wherein the teeth 31 of the motor stator surrounded by the windings are opposite to the magnets 21 inside the motor rotor 20.

As shown in conjunction with fig. 3, 4, 5 and 6, in an embodiment of the present disclosure, there is provided a washing machine (not shown), including:

a drum (not shown);

the motor 40 according to the above embodiment is connected to the drum, and the motor 40 is used to drive the drum to rotate.

Examples: the example provides a heat dissipation assembly applied to the field of Direct Drive (DD) motors of household washing machines.

Some washing machine drums are all provided with brushless direct current (Brushless Direct Current Motor, BLDC) motors which are driven by belt pulleys, DD motors are generated along with technical development, windings of the DD motors are enclosed in rotors, generated heat is not easy to transfer out, and at present, a mode of opening radiating holes is mainly adopted, so that the radiating efficiency is low.

The embodiment of the disclosure can solve the problem of low heat dissipation efficiency of the current DD motor.

In the related art, heat dissipation holes are mainly formed in a rotor disc, so that heat accumulated in a motor is dissipated through the heat dissipation holes, and the heat dissipation efficiency is poor because forced convection is not performed.

A rotor disk: and plastic is used for coating the magnetic steel and the magnetic yoke to form the rotor.

Winding: wound around the stator teeth.

The rotor disc is provided with an inclined duct, when the motor rotates clockwise and anticlockwise, the inclined face can play a role of a fan blade, wind is pumped out from the inner side to form forced convection, and the motor winding is cooled; the blocking ribs can prevent the hot air from flowing back into the pore canal of the adjacent heat dissipation holes immediately after the hot air comes out to a certain extent, so that the heat dissipation effect is prevented from being weakened. Here, the ribs may be described by the ribs described above, and the duct may be described by the duct of the above embodiment.

The forced convection duct is designed, so that the temperature of the motor can be obviously reduced, the two sides of the duct are closed to enhance the convection heat dissipation effect, the motor volume can be reduced under the same working condition, and the motor cost is reduced.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following application.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the accompanying application documents.

Claims (11)

1. A heat dissipating assembly (10), comprising:

a bracket (11) of a motor rotor (20), wherein the bracket (11) comprises a bracket surface (111) and a heat dissipation hole (112) arranged on the bracket surface (111);

the radiating fins (12) are arranged in the radiating holes (112), and an included angle between each radiating fin (12) and the frame surface (111) is an acute angle or an obtuse angle;

the gap between the radiating fin (12) and the radiating hole (112) forms a radiating air duct (121).

2. The heat dissipating assembly (10) of claim 1, wherein said heat sink (12) comprises:

a first fin having a first inclined surface (122);

and/or the number of the groups of groups,

a second fin having a second inclined surface (123);

wherein the first inclined surface (122) and the second inclined surface (123) are axially symmetrically arranged relative to the frame surface (111).

3. The heat dissipating assembly (10) of claim 2, wherein said motor rotor (20) is a bi-directional rotor;

-one of said first cooling fins and one of said second cooling fins are symmetrically distributed in one of said cooling holes (112);

or alternatively, the process may be performed,

the first cooling fins and the second cooling fins are distributed in different cooling holes (112) in a staggered manner.

4. A heat sink assembly (10) according to claim 3, wherein the first inclined surface (122) and the second inclined surface (123) of the same fin (12) are connected by ribs (124) and are distributed axisymmetrically with respect to the ribs (124).

5. The heat dissipating assembly (10) of claim 2, wherein said motor rotor (20) is a unidirectional rotor;

the first inclined surface (122) or the second inclined surface (123) of the fin (12) in each of the heat radiation holes (112) has an inclination direction of: from facing away from the shelf surface (111) to being flush with the shelf surface (111).

6. The heat dissipating assembly (10) of claim 2, wherein said heat sink (12) further comprises:

and a diversion plane (125) positioned at the end of the radiating fin (12) far away from the frame surface (111).

7. The heat dissipating assembly (10) of any of claims 2 to 4,

the first inclined surface (122) is positioned on one side of the frame surface (111) facing the motor stator (30); or extends on both sides of the frame surface (111);

and/or the number of the groups of groups,

the second inclined surface (123) is positioned on one side of the frame surface (111) facing the motor stator (30); or extend on both sides of the shelf surface (111).

8. The heat dissipating assembly (10) of claim 2, wherein said heat dissipating assembly (10) further comprises:

and a retaining wall (13), wherein the retaining wall (13) extends from the frame surface (111) to a direction away from the frame surface (111).

9. An electric machine (40), comprising:

a motor rotor (20);

a motor stator (30), wherein a heating element (41) is arranged on the motor stator (30);

the heat dissipation assembly (10) as set forth in any one of claims 1-8, said heat dissipation assembly (10) being snap-fit onto said motor rotor (20) for heat dissipation of said heat generating element (41).

10. The electric machine (40) of claim 9 wherein,

the heating element (41) includes:

windings wound on teeth (31) of the motor stator (30); wherein the teeth (31) of the motor stator (30) surrounded by the windings are opposite to the magnets (21) inside the motor rotor (20).

11. A washing machine, comprising:

a roller;

a motor (40) according to any one of claims 9 to 10, connected to the drum, the motor (40) being adapted to drive the drum in rotation.