CN211701696U - Motor, underwater propeller and electric floating plate - Google Patents

Abstract

The utility model relates to the technical field of underwater sports equipment and equipment, and discloses a motor, an underwater propeller and an electric floating plate, wherein the motor comprises a shell, a stator assembly, a rotor assembly and a heat dissipation rear cover, the heat dissipation rear cover is connected with the shell to form a sealed space, and the stator assembly and the rotor assembly are arranged in the sealed space; the heat dissipation rear cover comprises a rear cover body, a heat conduction part and a heat dissipation part, wherein the heat conduction part is arranged on one side of the rear cover body, the heat dissipation part is arranged on the other side of the rear cover body, the rear cover body is connected with the shell in a sealing mode, the heat conduction part is connected with the stator assembly and is arranged inside the shell, and the heat dissipation part is arranged outside the shell. Has the advantages that: the motor forms a sealed space with the shell through the heat dissipation rear cover, and plays a role in water resistance; the heat conduction portion can lead out the heat that the motor produced fast to dispel the heat through the radiating part, this motor has satisfied the heat dissipation requirement, avoids direct and water contact moreover, thereby avoids the motor to take place the card and dies and corrode, has improved the reliability of motor, has prolonged the life of motor.

Description

Motor, underwater propeller and electric floating plate

Technical Field

The utility model relates to an underwater motion equipment technical field especially relates to a motor, underwater propulsor and electronic kickboard.

Background

The electric floating plate is a novel water sports product, can provide forward power for the floating plate by adding the propeller and the battery on the traditional floating plate, and enlarges the application range of the floating plate. The electric floating plate provides propulsion power through a motor and a propeller.

The existing motor adopts an open outer rotor structure for heat dissipation and motor volume consideration, and the open outer rotor motor has the advantages of large torque, small volume and good heat dissipation. But this structure uses under the water environment that has the impurity and extremely easily blocks to die, simultaneously in the use, because stator and rotor all directly contact with water, magnet is corroded very easily, and then makes the reliability of motor reduce, life reduces. Therefore, it is urgently needed to design a motor, which can meet the heat dissipation requirement, and can prevent the motor from being stuck due to the contact of the motor and impurities or preventing the corrosion failure of key parts of the motor due to the contact of the motor and water, thereby improving the reliability of the motor and prolonging the service life of the motor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a motor, underwater propulsor and electronic kickboard, solved current open external rotor electric machine and in order to satisfy the heat dissipation requirement, the motor is direct and the water contact leads to corroding easily, the dead technical problem of card.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a motor, which comprises a shell, a stator assembly, a rotor assembly and a heat dissipation rear cover, wherein the heat dissipation rear cover is connected with the shell to form a sealed space, and the stator assembly and the rotor assembly are arranged in the sealed space;

the heat dissipation rear cover comprises a rear cover body, a heat conduction part and a heat dissipation part, the heat conduction part is arranged on one side of the rear cover body, the heat dissipation part is arranged on the other side of the rear cover body, the rear cover body is connected with the shell in a sealing mode, the heat conduction part is connected with the stator assembly and is arranged inside the shell, and the heat dissipation part is arranged outside the shell.

The motor forms a sealed space for accommodating the stator assembly and the rotor assembly through the heat dissipation rear cover and the shell, and plays a waterproof role; the heat conduction portion of lid can make the heat that the motor produced derive fast behind the heat dissipation to dispel the heat through the radiating part, with the heat dissipation to the aquatic with the motor production, this motor had both guaranteed can satisfy the heat dissipation requirement, avoided direct and water contact moreover, thereby avoid the motor to take place the card and die and corrode, improved the reliability of motor, prolonged the life of motor.

As a preferable mode of the above motor, an outer wall of the heat conducting portion is in interference fit with an inner wall of the stator assembly. The connection mode is simple and easy to realize.

As a preferable mode of the motor, a length of the heat conducting portion is equal to or greater than a length of the stator assembly in an axial direction thereof. This setting makes the area of contact of heat conduction portion and stator module big, and the heat conduction is effectual.

As a preferable scheme of the motor, the rear cover body is provided with a plurality of threading holes, electric wires connected with the stator assembly penetrate through the threading holes, and the electric wires and the inner walls of the threading holes are arranged in a sealing manner. The electric wire that is convenient for link to each other with stator module of setting up of through wires hole is worn out, through sealed setting between the inner wall in electric wire and through wires hole, can play sealed effect, avoids water to enter into the motor by the clearance between electric wire and the through wires hole inside and influence the performance of motor.

In a preferred embodiment of the motor, a sealing cover is provided on the heat-radiating rear cover, and the sealing cover abuts against the heat-radiating portion. The sealed lid butt is in the radiating part, avoids water to enter into the motor by the radiating part in, influences motor performance.

As a preferable mode of the motor, the heat dissipation part includes a first heat dissipation part and a second heat dissipation part, the second heat dissipation part is sleeved outside the first heat dissipation part, and the second heat dissipation part is connected to the circumferential direction of the rear cover body; and glue is filled and sealed among the first heat dissipation part, the second heat dissipation part and the rear cover body. The heat dissipation part comprises a first heat dissipation part and a second heat dissipation part, the area of contact with external water is increased, heat can be uniformly dissipated, and the heat dissipation effect is good.

As a preferable scheme of the above motor, the rotor assembly includes a rotating shaft, and an output end of the rotating shaft penetrates out of the housing and is sealed by a dynamic sealing structure at a position where the rotating shaft is matched with the housing. The output end of the rotating shaft penetrates out of the shell, and the output end of the rotating shaft is sealed with the matching position of the shell through a dynamic sealing structure, so that the sealing effect can be achieved on the premise of realizing relative rotation between the stator assembly and the rotor assembly.

As a preferable mode of the motor, the heat-dissipating rear cover includes a mounting hole, and the mounting hole penetrates through the heat-conducting portion and the heat-dissipating portion and is configured to receive the rotating shaft. Through covering after the heat dissipation and set up the mounting hole, the mounting hole link up heat-conducting part and radiating part, can be convenient for accomodate of countershaft.

As a preferable scheme of the above motor, a first bearing and a second bearing are disposed at two ends of the mounting hole, and are used for supporting the rotating shaft. The first bearing and the second bearing are arranged at two ends of the mounting hole, so that the rotating support of the rotating shaft can be realized.

The utility model also provides an underwater propeller, which comprises the motor, wherein a propeller is arranged on a rotating shaft of the motor; a gap is arranged between the dynamic sealing structure of the motor and the propeller.

This underwater propulsor passes through above-mentioned motor, can realize good heat dispersion, prolongs underwater propulsor's life, through being provided with the clearance between the dynamic seal structure of motor and the screw, has increased the pivot of motor and the area of water contact to radiating efficiency has been improved.

The utility model also provides an electronic kickboard, including foretell underwater propulsor.

The electric floating plate has good heat dissipation effect and long service life.

The utility model has the advantages that:

the utility model provides a motor, through the heat dissipation back lid with the casing form the confined space who holds stator module and rotor subassembly, play waterproof role of sealing; the heat conduction portion of lid can make the heat that the motor produced derive fast behind the heat dissipation to dispel the heat through the radiating part, in order to produce the aquatic with the motor, this motor both can prevent that the motor from because of contacting the impurity card of aquatic dieing, has improved the reliability of motor, can satisfy the heat dissipation requirement again, avoids direct and water contact to produce the corruption moreover, has prolonged the life of motor.

The utility model provides an underwater propeller has good heat dispersion and reliability.

The utility model provides an electronic kickboard has good heat dispersion and reliability.

Drawings

Fig. 1 is a schematic structural diagram of a motor provided by the present invention;

fig. 2 is a cross-sectional view of an electric machine provided by the present invention;

fig. 3 is a schematic structural view of an angle of the heat dissipation rear cover provided by the present invention;

fig. 4 is a schematic structural view of another angle of the heat dissipation rear cover provided by the present invention;

fig. 5 is a schematic view of an angle of the underwater propeller provided by the present invention;

fig. 6 is a schematic structural view of another angle of the underwater propeller provided by the present invention;

fig. 7 is a cross-sectional view of an underwater propulsor provided by the present invention.

In the figure:

100. a motor;

1. a housing; 2. a stator assembly;

3. a rotor assembly; 31. a rotating shaft; 311. a helical groove; 32. a first bearing; 33. a second bearing;

4. a heat dissipation rear cover; 41. a rear cover body; 411. mounting holes; 412. threading holes; 42. a heat conducting portion; 421. mounting grooves; 43. a heat dissipating section; 431. a first heat sink portion; 432. a second heat sink member; 44. sealing the connection part; 45. a lug; 451. a fixing hole;

5. a sealing cover; 51. a sealing cover body; 52. a holding portion; 6. an electric wire;

7. a dynamic sealing structure; 8. a first seal structure; 9. a second seal structure; 10. a third seal structure;

200. a propeller; 201. auxiliary blades.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The first embodiment is as follows:

the existing motor adopts an open outer rotor structure for heat dissipation and motor volume consideration, and the open outer rotor motor has the advantages of large torque, small volume and good heat dissipation. But this structure uses under the water environment that has the impurity and extremely easily blocks to die, simultaneously in the use, because magnet direct and water contact cause the magnet to corrode very easily, and then influence product life-span. Therefore, this embodiment provides a motor, can enough satisfy the heat dissipation requirement, can also avoid the motor directly to contact with water or aquatic impurity, has improved the reliability of motor, has prolonged the life of motor. As shown in fig. 1 to 4, the motor 100 includes a housing 1, a stator assembly 2, a rotor assembly 3, and a heat-dissipating rear cover 4, the heat-dissipating rear cover 4 is connected to the housing 1 to form a sealed space, and the stator assembly 2 and the rotor assembly 3 are disposed in the sealed space; the heat dissipation rear cover 4 includes a rear cover body 41, a heat conduction portion 42 disposed on one side of the rear cover body 41, and a heat dissipation portion 43 disposed on the other side of the rear cover body 41, the rear cover body 41 is hermetically connected to the housing 1, the heat conduction portion 42 is connected to the stator assembly 2 and disposed inside the housing 1, and the heat dissipation portion 43 is disposed outside the housing 1.

The motor 100 forms a sealed space for accommodating the stator assembly 2 and the rotor assembly 3 through the heat-radiating rear cover 4 and the shell 1, and plays a role in sealing and waterproofing; the heat conduction portion 42 of lid 4 can make the heat that motor 100 produced derive fast behind the heat dissipation to dispel the heat through heat dissipation portion 43, with the heat dissipation to the aquatic with motor 100 production, this motor had both guaranteed can satisfy the heat dissipation requirement, avoided direct and water direct contact moreover, thereby avoid motor 100 to take place the card dead and corrode, improved motor 100's reliability, prolonged motor 100's life.

Optionally, the end of the housing 1 away from the heat dissipation rear cover 4 is tapered to reduce the resistance.

Optionally, the heat dissipation rear cover 4 is made of an aluminum material, so that the heat transfer effect is good, and the heat dissipation effect is good. The heat dissipation rear cover 4 can also be made of other materials with good heat conductivity.

Optionally, the heat dissipation rear cover 4 is integrally formed, so that the sealing performance of the heat dissipation rear cover 4 is ensured. In this embodiment, the heat dissipation rear cover 4 is made of aluminum alloy, and not only has a good heat dissipation effect, but also meets the strength requirement.

Optionally, the outer wall of the heat conducting portion 42 is in interference fit with the inner wall of the stator assembly 2, so that the connection mode is simple, and the heat conducting effect is good. The heat conducting portion 42 may also be connected by a connecting member, which is not specifically limited herein, as long as the heat conducting portion 42 is abutted against the inner wall of the stator assembly 2, so as to dissipate the heat generated by the stator assembly 2. In this embodiment, the heat conducting portion 42 is of a sleeve structure, so that the heat conducting portion 42 and the stator assembly 2 can be in circumferential contact, the contact area is large, and the heat conducting effect is good. Preferably, the length of the heat conduction portion 42 is equal to or greater than the length of the stator assembly 2 in the axial direction thereof, so that the contact area between the heat conduction portion 42 and the stator assembly 2 is large, further enhancing the heat conduction effect.

Optionally, the heat dissipation part 43 includes a first heat dissipation part 431 and a second heat dissipation part 432 coaxially disposed, the second heat dissipation part 432 is sleeved outside the first heat dissipation part 431, and the second heat dissipation part 432 is connected to the circumferential direction of the rear cover body 41; the first heat sink member 431, the second heat sink member 432, and the rear cover body 41 are sealed by potting. The first heat sink member 431 and the second heat sink member 432 each extend in the longitudinal direction of the housing 1, so that the heat conducted from the heat conduction member 42 can be uniformly conducted to the outside of the housing 1 along the longitudinal direction of the housing 1 through the first heat sink member 431 and the second heat sink member 432. The first heat sink member 431, the second heat sink member 432, and the rear cover body 41 are sealed by potting, so that water can be prevented from entering the motor 100.

Alternatively, the first heat sink member 431 has a sleeve structure, and a radial cross section of the first heat sink member 431 has an annular structure. The rear cover body 41 is provided with a mounting hole 411, and the mounting hole 411 penetrates the heat conducting portion 42 and the heat radiating portion 43 and houses the rotating shaft 31 of the rotor assembly 3. The mounting hole 411 is coaxially disposed with the heat conducting portion 42 and the heat radiating portion 43, so that the structure is simple and the mounting of the rotating shaft 31 is facilitated.

Optionally, a first bearing 32 and a second bearing 33 are disposed at two ends of the mounting hole 411, and the first bearing 32 and the second bearing 33 are disposed to realize the rotation support of the rotating shaft 31. Specifically, the mounting grooves 421 are formed in the inner walls of the two ends of the mounting hole 411, the first bearing 32 and the second bearing 33 are respectively mounted in the two mounting grooves 421, and the mounting grooves 421 are convenient for mounting the first bearing 32 and the second bearing 33. The first bearing 32 and the second bearing 33 are respectively sleeved on the rotating shaft 31, so that the rotating shaft 31 is rotatably arranged.

Alternatively, the heat conduction part 42 has an inner diameter smaller than that of the mounting hole 411, and the mounting hole 411 has a diameter smaller than that of the first heat sink part 431, so that the assembly of the motor 100 is facilitated.

In order to connect the heat-dissipating rear cover 4 to the housing 1, a plurality of lugs 45 are circumferentially disposed on the second heat-dissipating portion 432, fixing holes 451 are disposed on the lugs 45, and the rear cover body 41 is connected to the housing 1 by fasteners passing through the fixing holes 451. The connection with the shell 1 is realized through the arrangement of the lugs 45, and the structure is simple. Alternatively, the fixing member may be a bolt.

Optionally, heat dissipation ribs may be disposed between the first heat dissipation part 431 and the second heat dissipation part 432, and the heat dissipation ribs are connected to the rear cover body 41, so that heat dissipation can be further accelerated, and the specific shape of the heat dissipation ribs is not limited herein.

As shown in fig. 1 and 2, the motor 100 further includes a sealing cover 5, the sealing cover 5 abuts against the heat sink member 43, and optionally, the sealing cover 5 seals the first heat sink member 431, one end of the sealing cover 5 extends into the first heat sink member 431, and the other end of the sealing cover 5 abuts against the first heat sink member 431 in a sealing manner. The setting of sealed lid 5 can seal motor 100's pivot 31, avoids water to enter into motor 100 by lid 4 after the heat dissipation, influences motor 100's performance. Of course, the sealing cover 5 may also seal the second heat sink member 432 from water entering the motor 100. In this embodiment, the sealing cover 5 seals the first heat sink member 431.

Alternatively, the other end of the seal cover 5 and the first heat sink member 431 are sealed by a first seal structure 8, and the first seal structure 8 is a static seal.

Specifically, as shown in fig. 2, the seal cover 5 includes a seal cover body 51 and a holding portion 52 located at one end of the seal cover body 51, an outer diameter of the seal cover body 51 is smaller than or equal to an inner diameter of the first heat dissipating portion 431, a circumferential dimension of the holding portion 52 is larger than an outer diameter of the seal cover body 51, the seal cover body 51 extends into the first heat dissipating portion 431, and the holding portion 52 and one end of the first heat dissipating portion 431, which is not connected to the rear cover body 41, are sealingly held. The abutting portion 52 is connected to the end of the first heat sink portion 431 not connected to the rear cover body 41 by the first seal structure 8.

As shown in fig. 3 and 4, the rear cover body 41 is further provided with a sealing connection portion 44 in the circumferential direction of the side thereof provided with the heat conduction portion 42, and the sealing connection portion 44 is inserted into the housing 1 and is connected to the housing 1 in a sealing manner. The sealing connection part 44 is capable of forming a sealing connection with the housing 1, so as to prevent water from entering from a gap between the housing 1 and the heat dissipation rear cover 4 and affecting the use performance of the motor 100.

Optionally, the circumferential direction of the sealing connection portion 44 is provided with a groove structure, the second sealing structure 9 is arranged between the groove structure and the inside of the casing 1, the second sealing structure 9 is accommodated conveniently due to the groove structure, and water entering from a gap between the casing 1 and the heat dissipation rear cover 4 can be avoided through the second sealing structure 9, so that the use performance of the motor 100 is affected. The second sealing structure 9 is a static seal.

The output end of the rotating shaft 31 of the rotor assembly 3 penetrates out of the housing 1, and the matching part of the output end and the housing 1 is sealed through the dynamic sealing structure 7. The output end of the rotating shaft 31 penetrates out of the shell 1, and the matching position of the rotating shaft and the shell 1 is sealed through the dynamic sealing structure 7, so that the sealing effect can be achieved on the premise that the relative rotation between the stator assembly 2 and the rotor assembly 3 is achieved.

Alternatively, the dynamic seal structure 7 adopts two oil seals for sealing, and the dynamic seal structure 7 can also adopt other seals such as a universal plug seal, a stett seal and the like.

Optionally, the rear cover body 41 is provided with a plurality of threading holes 412, the wires 6 connected to the stator assembly 2 are threaded in the threading holes 412, and the wires 6 and the inner walls of the threading holes 412 are sealed. The electric wire 6 that is convenient for link to each other with stator module 2 wears out in the setting of through wires hole 412, through sealed setting between the inner wall of electric wire 6 and through wires hole 412, can play sealed effect, avoids inside water enters into motor 100 by the clearance between electric wire 6 and the through wires hole 412, influences motor 100's performance. When the sealing cover 5 seals the second heat sink member 432, since the electric wire 6 is inserted through the rear cover body 41, it is necessary to provide a wire hole in the sealing cover 5 and seal a gap between the electric wire 6 and the wire hole.

Optionally, the wire 6 is sealed with the inner wall of the threading hole 412 by a third sealing structure 10, and the third sealing structure 10 is a static seal.

The first sealing structure 8, the second sealing structure 9 and the third sealing structure 10 can adopt structures such as an O-shaped ring, a gasket, a star-shaped ring and the like as long as static sealing can be realized.

Preferably, the third sealing structure 10 further includes a glue filling seal, and a sealant is filled among the first heat sink member 431, the second heat sink member 432, and the rear cover body 41, so that the sealing effect is further improved.

The motor 100 realizes the sealing and water proofing of the motor 100 through the dynamic sealing structure 7 and the three static seals (the first sealing structure 8, the second sealing structure 9 and the third sealing structure 10), thereby ensuring the impurity prevention and corrosion prevention performance of the motor 100.

This motor 100 forms the confined space who holds stator module 2 and rotor subassembly 3 through lid 4 and casing 1 behind the heat dissipation, play waterproof effect, heat conduction portion 42 sets up between stator module 2 and rotor subassembly 3, and with stator module 2 inner wall looks butt for the heat that motor 100 produced can derive heat dissipation portion 43 through heat conduction portion 42 fast, conduct external aquatic through heat dissipation portion 43, the reliability of motor 100 has been improved.

Example two:

the present embodiment provides a motor 100, in which the structure of the heat conducting portion 42 of the heat dissipation rear cover 4 in the present embodiment is different from the structure of the heat conducting portion 42 in the first embodiment, the structure of the heat conducting portion 42 in the first embodiment is an integrated sleeve structure, and the heat conducting portion 42 in the present embodiment may be an arc structure, and the arc structure is in heat conduction and abutted with the stator assembly 2, so as to perform a heat conduction function.

Alternatively, the heat conduction portion 42 may include one arc-shaped structure, and may further include a plurality of arc-shaped structures, and when the heat conduction portion 42 includes a plurality of arc-shaped structures, the plurality of arc-shaped structures are spaced apart from each other to form a cylindrical structure. Of course, the heat conducting portion 42 may have other shapes as long as the heat of the stator assembly 2 can be conducted out, thereby facilitating heat dissipation.

Optionally, the heat conducting portion 42 may be connected with the stator assembly 2 in an interference fit manner, and the heat conducting portion 42 may be connected with the stator assembly 2 by using a heat conducting sealant between the heat conducting portion 42 and the stator assembly 2, so that a heat conducting effect is achieved, and a waterproof effect is also achieved.

Example three:

the utility model discloses still provide an underwater propulsor, as shown in fig. 5-7, including the motor 100 in above-mentioned embodiment one or embodiment two, install screw 200 on the pivot 31 of motor 100. The underwater propeller can realize good heat dissipation performance and reliability through the motor 100.

The rotating shaft 31 of the motor 100 and the rotor assembly 3 are sealed by a dynamic sealing structure (e.g., an oil seal), and the oil seal generates a large amount of heat during the high-speed rotation of the motor 100, and even if the oil seal contacts water, the heat is not dissipated. Poor heat dissipation for a long time can seriously reduce the service life of the oil seal and also reduce the sealing performance of the oil seal. In order to solve the problem of heat dissipation of the dynamic seal structure, a gap is formed between the dynamic seal structure 7 of the motor 100 and the propeller 200, so that on one hand, water flow washes the dynamic seal structure 7 and the rotating shaft 31 for cooling, on the other hand, the contact area between the rotating shaft 31 of the motor 100 and water is increased, the heat dissipation efficiency of heat transferred to the rotating shaft 31 by the dynamic seal structure is increased, and the heat dissipation efficiency of the rotating shaft 31 is improved from the two aspects.

Preferably, the clearance provided between the dynamic seal structure 7 of the motor 100 and the propeller 200 ranges between 2mm and 20mm, including 2mm and 20 mm. Optionally, an auxiliary blade 201 is disposed on an inner wall of the casing 1 of the propeller 200 near one end of the dynamic seal structure 7, and the auxiliary blade 201 enhances the liquid flow in the cavity inside the propeller 200 to promote the heat dissipation of the dynamic seal structure 7 when the motor 100 rotates.

Optionally, a spiral groove 311 is provided on the rotating shaft 31 between the dynamic seal structure 7 of the motor 100 and the propeller 200, for increasing the heat dissipation area of the rotating shaft 31, which is beneficial to promoting the heat dissipation of the dynamic seal structure.

Alternatively, the diameter of the end of the rotating shaft 31 of the motor 100 protruding out of the housing 1 of the motor 100 is smaller than the diameter of the body of the rotating shaft 31 of the motor 100 to reduce the resistance of the underwater propeller.

Example four:

the utility model also provides an electronic kickboard, including the underwater propulsor in the third embodiment. The casing 1 of the underwater propeller motor 100 is provided with a connecting arm for fixing the underwater propeller in a flow channel of the electric floating plate. The underwater propeller has good heat dissipation performance and reliability. The motor 100 drives the propeller to rotate in the water to generate thrust, so that the electric floating plate generates forward power. When the electric floating plate is used, the underwater propeller and the motor 100 are both positioned in water, and the underwater propeller and the motor 100 thereof have a better heat dissipation environment, so that the electric floating plate has a good heat dissipation effect and a long service life.

In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are used in a descriptive sense or positional relationship based on the orientation or positional relationship shown in the drawings for convenience of description and simplicity of operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (11)

1. A motor comprises a shell (1), a stator assembly (2) and a rotor assembly (3), and is characterized in that the motor (100) further comprises a heat dissipation rear cover (4), the heat dissipation rear cover (4) is connected with the shell (1) to form a sealed space, and the stator assembly (2) and the rotor assembly (3) are arranged in the sealed space;

the heat dissipation rear cover (4) comprises a rear cover body (41), a heat conduction part (42) arranged on one side of the rear cover body (41) and a heat dissipation part (43) arranged on the other side of the rear cover body (41), the rear cover body (41) is hermetically connected with the shell (1), the heat conduction part (42) is connected with the stator assembly (2) and arranged inside the shell (1), and the heat dissipation part (43) is arranged outside the shell (1).

2. The machine according to claim 1, characterized in that the outer wall of the heat conducting portion (42) is interference fitted with the inner wall of the stator assembly (2).

3. The machine according to claim 2, characterized in that the length of the heat conducting portion (42) is equal to or greater than the length of the stator assembly (2) in the axial direction thereof.

4. The motor as claimed in claim 1, wherein a plurality of threading holes (412) are formed in the rear cover body (41), electric wires (6) connected with the stator assembly (2) are threaded in the threading holes (412), and the electric wires (6) are hermetically arranged with the inner wall of the threading holes (412).

5. The machine according to claim 1, characterized in that a sealing cover (5) is provided on the heat-dissipating rear cover (4), the sealing cover (5) abutting against the heat-dissipating portion (43).

6. The motor according to claim 1, wherein the heat sink member (43) comprises a first heat sink member (431) and a second heat sink member (432), the second heat sink member (432) is fitted over an outer side of the first heat sink member (431), and the second heat sink member (432) is connected to a circumferential direction of the rear cover body (41); and glue is filled and sealed among the first heat dissipation part (431), the second heat dissipation part (432) and the rear cover body (41).

7. The electric machine according to any of claims 1-6, characterized in that the rotor assembly (3) comprises a rotating shaft (31), the output end of the rotating shaft (31) penetrates out of the housing (1), and the matching part of the rotating shaft and the housing (1) is sealed by a dynamic sealing structure (7).

8. The electric machine according to claim 7, characterized in that the heat-dissipating rear cover (4) comprises a mounting hole (411), the mounting hole (411) passing through the heat-conducting portion (42) and the heat-dissipating portion (43) for receiving the rotating shaft (31).

9. The electric machine according to claim 8, characterized in that a first bearing (32) and a second bearing (33) are provided at both ends of the mounting hole (411) for supporting the rotating shaft (31).

10. An underwater propeller, characterized by comprising a motor as claimed in any one of claims 1 to 9, a propeller (200) being mounted on a rotating shaft (31) of the motor (100); a gap is arranged between the dynamic sealing structure (7) of the motor (100) and the propeller (200).

11. An electrically powered floating board comprising the underwater propeller of claim 10.

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