A water-cooled outer rotor motor

Abstract

The utility model discloses a water -cooling outer rotor motor, including stator subassembly, rotor subassembly and motor shaft, stator subassembly includes fixed base, stator mechanism and seal ring, and fixed base includes stator end cover and sleeve, and the inner wall and the outer wall between sleeve are equipped with water -cooling cavity, and the end of sleeve is equipped with the annular process groove that can supply processing cutter to extend into water -cooling cavity, and annular process groove communicates water -cooling cavity, and seal ring seals and is embedded in annular process groove, and stator mechanism sets up on sleeve, and rotor subassembly is from the opposite side of stator end cover of stator mechanism and sets up on stator mechanism, and motor shaft rotatably is threaded on sleeve, and the first end of motor shaft projects to the end of sleeve and is connected with rotor subassembly, and the second end of motor shaft projects to stator end cover, the sleeve of the utility model has water -cooling cavity, and the heat generated by stator mechanism is transferred to the cooling water of water -cooling cavity through sleeve, and is taken out to the motor outside through the cooling circulation of cooling water, and the motor is directly cooled from the motor center position, makes the motor have good heat dissipation effect.

Description

Technical Field

[0001] This utility model relates to the field of external rotor motor technology, and more particularly to a water-cooled external rotor motor. Background Technology

[0002] Based on the rotating parts of the motor, motors can be divided into internal rotor motors and external rotor motors, each with its own advantages and applications. The main structure of an external rotor motor includes a stator assembly, a rotor assembly, and a motor shaft. The rotor assembly surrounds the outer circumference of the stator assembly, and the motor shaft rotatably passes through the stator assembly. Both ends of the motor shaft protrude from the stator assembly; one end connects to the rotor assembly, and the other end is the output end. The stator assembly includes a stator support and stator windings. The stator support includes stator end covers and a sleeve, and the stator windings are mounted on the sleeve.

[0003] In an external rotor motor, the external rotor rotates externally while the stator assembly remains stationary. The stator assembly includes the stator windings and the iron core. When an external rotor motor operates at high speed and high load, the stator assembly generates heat. Since the stator windings and iron core are located at the center of the motor, they are subject to multiple layers of obstruction during heat dissipation, preventing the generated heat from being directly transferred to the outside. Therefore, heat dissipation is difficult. Utility Model Content

[0004] In order to solve the technical problem of heat dissipation difficulties in existing external rotor motors, one of the objectives of this utility model is to provide a water-cooled external rotor motor.

[0005] One of the objectives of this utility model is achieved through the following technical solution:

[0006] A water-cooled external rotor motor, the water-cooled external rotor motor comprising a stator assembly, a rotor assembly and a motor shaft;

[0007] The stator assembly includes a fixed base, a stator mechanism, and a sealing ring. The fixed base includes a stator end cover and a sleeve disposed on the stator end cover.

[0008] A water-cooling cavity is provided between the inner and outer walls of the sleeve, and an annular process groove is provided at the end of the sleeve for a machining tool to extend into the water-cooling cavity, the annular process groove being connected to the water-cooling cavity;

[0009] The sealing ring is sealed and embedded in the annular process groove;

[0010] The stator mechanism is disposed on the sleeve;

[0011] The rotor assembly is fitted onto the stator mechanism from the side of the stator mechanism opposite to the stator end cover;

[0012] The motor shaft is rotatably mounted on the sleeve. The first end of the motor shaft protrudes from the end of the sleeve and is connected to the rotor assembly. The second end of the motor shaft protrudes from the stator end cover and is used to output power.

[0013] Optionally, the annular process groove is located at the junction of the end face of the sleeve and the inner wall of the sleeve, and the first end of the motor shaft passes through the sealing ring.

[0014] Optionally, the outer circumferential surface of the first end of the sealing ring is provided with an abutting ring that abuts against the end of the sleeve, the end face of the second end of the sealing ring abuts against the sleeve, and a limiting ring is provided on the end face of the second end of the sealing ring. The limiting ring extends into the water-cooling cavity, and the inner wall of the limiting ring abuts against the inner wall of the water-cooling cavity.

[0015] Optionally, a first sealing groove is provided on the outer circumferential surface of the first end of the sealing ring at the position abutting against the sleeve, and a second sealing groove is provided on the end face of the second end of the sealing ring at the position abutting against the sleeve, and a sealing ring is provided in the first sealing groove and the second sealing groove.

[0016] Optionally, the annular process groove extends axially toward the stator end cover to increase its depth, the length of the sealing ring is adapted to the depth of the annular process groove, and the inner wall of the sealing ring is provided with a bearing groove for accommodating the bearing.

[0017] Optionally, the stator assembly further includes a pressure ring, the inner diameter of which is smaller than the outer diameter of the sealing ring, and the pressure ring is disposed on the end face of the sleeve end for pressing the sealing ring.

[0018] Optionally, the outer diameter of the pressure ring is larger than the outer diameter of the sleeve.

[0019] Optionally, the stator end cover is provided with a water inlet and a water outlet, both of which are connected to the water-cooling cavity.

[0020] Optionally, the rotor assembly includes a rotor end cover, a housing, and a plurality of magnets, wherein the rotor end cover is disposed on one side of the housing, and the plurality of magnets are arranged circumferentially on the inner wall of the housing.

[0021] The housing is fitted onto the stator mechanism, and a plurality of magnets surround the stator mechanism. There is an air gap between the magnets and the stator mechanism, and the first end of the motor shaft is connected to the rotor end cover.

[0022] Optionally, the inner side of the rotor end cover is provided with a plurality of first grooves for assembling magnets, and the plurality of first grooves are evenly distributed along the circumference.

[0023] The first end of the magnet extends into the first groove;

[0024] The rotor assembly also includes a magnetic retaining ring, which is retained inside the housing and located at the end away from the rotor end cover. The magnetic retaining ring has a plurality of second grooves on the side near the magnet, and the plurality of second grooves are evenly distributed along the circumference.

[0025] The second end of the magnet extends into the second groove.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] In this invention, the water-cooled external rotor motor includes a stator assembly, a rotor assembly, and a motor shaft. A portion of the rotor assembly is fitted onto the stator assembly, forming an electromagnetic connection. The stator assembly is mounted on a sleeve of a fixed base. The end of the sleeve has an annular groove for inserting a machining tool into the water-cooling cavity. This facilitates the insertion of the tool into the groove, allowing for machining of the water-cooling cavity between the inner and outer walls of the sleeve, thus improving the machining convenience of the water-cooling cavity. Additionally, this invention includes a sealing ring, which is embedded in the annular groove to fill any gaps caused by the groove and seal the water-cooling cavity, preventing cooling water leakage. Overall, the sleeve of this invention provides a water-cooling cavity. The heat generated by the stator assembly is transferred through the sleeve to the cooling water in the cavity. The cooling water then circulates and carries the heat out of the motor, directly cooling the motor from its center, resulting in excellent heat dissipation. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the water-cooled external rotor motor of this utility model;

[0029] Figure 2 This is an exploded view of the water-cooled external rotor motor of this utility model;

[0030] Figure 3 This is an exploded view of the stator assembly in the water-cooled external rotor motor of this utility model;

[0031] Figure 4 This is an exploded view of the rotor assembly in the water-cooled external rotor motor of this utility model;

[0032] Figure 5 This is a cross-sectional view of the water-cooled external rotor motor of this utility model;

[0033] Figure 6 This is a cross-sectional view of the mounting base in the water-cooled external rotor motor of this utility model;

[0034] Figure 7 This is a cross-sectional view of the sealing ring in the water-cooled external rotor motor of this utility model.

[0035] Explanation of reference numerals in the attached diagram:

[0036] 1. Stator assembly; 11. Mounting base; 111. Stator end cover; 112. Sleeve; 1121. Water cooling cavity; 1122. Annular process groove; 12. Stator mechanism; 13. Sealing ring; 131. Abutting ring; 132. Limiting ring; 133. First sealing groove; 134. Second sealing groove; 135. Bearing groove; 14. Pressure ring;

[0037] 2. Rotor assembly; 21. Rotor end cover; 22. Housing; 23. Magnet; 24. Magnetic coil;

[0038] 3. Motor shaft. Detailed Implementation

[0039] The following will refer to the appendices in the embodiments of this application. Figure 1 To be continued Figure 7 The technical solutions in the embodiments of this application are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0040] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0041] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0042] like Figures 1 to 5 The diagram shows a water-cooled external rotor motor, which includes a stator assembly 1, a rotor assembly 2, and a motor shaft 3. The stator assembly 1 includes a mounting base 11, a stator mechanism 12, and a sealing ring 13.

[0043] The fixed base 11 includes a stator end cover 111 and a sleeve 112 disposed on the stator end cover 111. A water-cooling cavity 1121 is provided between the inner wall and the outer wall of the sleeve 112, and an annular process groove 1122 is provided at the end of the sleeve 112 for a machining tool to extend into the water-cooling cavity 1121. The annular process groove 1122 communicates with the water-cooling cavity 1121.

[0044] The sealing ring 13 is embedded in the annular process groove 1122. The stator mechanism 12 is mounted on the sleeve 112.

[0045] The rotor assembly 2 is sleeved onto the stator mechanism 12 from the side opposite to the stator end cover 111. The motor shaft 3 is rotatably mounted on the sleeve 112, with the first end of the motor shaft 3 protruding from the end of the sleeve 112 and connected to the rotor assembly 2, and the second end of the motor shaft 3 protruding from the stator end cover 111 for outputting power.

[0046] In this invention, the water-cooled external rotor motor includes a stator assembly 1, a rotor assembly 2, and a motor shaft 3. A portion of the rotor assembly 2 is sleeved on the stator mechanism 12, forming an electromagnetic connection with the rotor assembly 2. The stator mechanism 12 is mounted on a sleeve 112 of a fixed base 11. The end of the sleeve 112 is provided with an annular process groove 1122 for inserting a machining tool into the water-cooling cavity 1121. This facilitates the insertion of the machining tool into the annular process groove 1122, thereby machining the water-cooling cavity 1121 between the inner and outer walls of the sleeve 112, improving the machining convenience of the water-cooling cavity 1121. Furthermore, this invention also includes a sealing ring 13, which is embedded in the annular process groove 1122 to fill any gaps caused by the groove and seal the water-cooling cavity 1121, preventing cooling water leakage. Overall, the sleeve 112 of this utility model has a water-cooled cavity 1121. The heat generated by the stator mechanism 12 is transferred to the cooling water in the water-cooled cavity 1121 through the sleeve 112. After the cooling water is circulated, it is carried out to the outside of the motor, directly cooling the motor from the center position, so that the motor has a good heat dissipation effect.

[0047] Of course, the water-cooled cavity 1121 dissipates heat through the circulation of coolant via external water-cooling pipes. Specifically, the stator end cover 111 is provided with a water inlet and a water outlet, both of which are connected to the water-cooled cavity 1121. The external water-cooling pipes include an inlet pipe and an outlet pipe. The inlet pipe is connected to the water inlet, and the outlet pipe is connected to the water outlet. At least one of the inlet and outlet pipes is connected to a water pump, thus enabling cooling circulation through the cooperation of the external water-cooling pipes and the water pump.

[0048] The sleeve 112 has an annular process groove 1122 at its end. The annular process groove 1122 can be located inside the end face of the sleeve 112. Thus, the width of the annular process groove 1122 is the same as the width of the water cooling cavity 1121.

[0049] Of course, the annular process groove 1122 can be partially located within the end face of the sleeve 112, for example, as shown in the image. Figure 5 , Figure 6 As shown, the annular process groove 1122 is located at the junction of the end face of the sleeve 112 and the inner wall of the sleeve 112, and the first end of the motor shaft 3 passes through the sealing ring 13. The annular process groove 1122 is located at the junction of the end face and the inner wall, thus, when machining the annular process groove 1122, the space of the hollow portion of the sleeve 112 can be utilized to machine the annular process groove 1122. When machining the water-cooling cavity 1121, a milling cutter is used with the annular process groove 1122 as the entry point, thereby machining a wider water-cooling cavity 1121 inside the sleeve 112. This allows for the machining of a larger water-cooling cavity 1121 with a smaller opening.

[0050] In some embodiments of the sealing ring 13, such as Figure 5 , Figure 7 As shown, the outer circumferential surface of the first end of the sealing ring 13 is provided with an abutting ring 131 that abuts against the end of the sleeve 112. The end face of the second end of the sealing ring 13 abuts against the sleeve 112. A limiting ring 132 is provided on the end face of the second end of the sealing ring 13. The limiting ring 132 extends into the water cooling cavity 1121, and the inner wall of the limiting ring 132 abuts against the inner wall of the water cooling cavity 1121. The abutting ring 131 abuts against the end of the sleeve 112 in the radial direction and forms a sealed connection. The end face of the second end of the sealing ring 13 abuts against the sleeve 112 and forms a sealed connection. At the same time, the inner wall of the limiting ring 132 abuts against the inner wall of the water-cooling cavity 1121, forming a fitting relationship between the limiting ring 132 and the inner wall of the water-cooling cavity 1121 of the sleeve 112. Thus, abutment, sealing and limiting are formed at both ends of the sealing ring 13, so that the sealing ring 13 is stably embedded in the annular process groove 1122 and has good sealing performance.

[0051] For sealing installations, specifically, such as Figure 5 , Figure 7 As shown, a first sealing groove 133 is provided on the outer circumferential surface of the first end of the sealing ring 13 at the position abutting against the sleeve 112, and a second sealing groove 134 is provided on the end face of the second end of the sealing ring 13 at the position abutting against the sleeve 112. Sealing rings are provided in both the first and second sealing grooves 133 and 134. By providing the first and second sealing grooves 133 and 134 at the position abutting against the sleeve 112, and by providing sealing rings within the first and second sealing grooves 133 and 134, a sealing and embedding effect is achieved.

[0052] More specifically, such as Figure 7 As shown, the first sealing groove 133 is located on the abutting ring 131, and the second sealing groove 134 is located on the end face of the second end of the sealing ring 13.

[0053] In some further embodiments of the sealing ring 13, the annular process groove 1122 extends axially toward the stator end cap 111 to increase its depth. The length of the sealing ring 13 is adapted to the depth of the annular process groove 1122, and the inner wall of the sealing ring 13 is provided with a bearing groove 135 for accommodating a bearing. The axial extension of the annular process groove 1122, adapted to the length of the sealing ring 13, increases the length of the sealing ring 13, making the sealing ring 13 sufficiently sized to accommodate the bearing groove 135, thus facilitating the placement of a bearing between the sealing ring 13 and the fixed shaft.

[0054] In some embodiments of stator assembly 1, such as Figure 2 , Figure 5 As shown, the stator assembly 1 also includes a pressure ring 14. The inner diameter of the pressure ring 14 is smaller than the outer diameter of the sealing ring 13. The pressure ring 14 is disposed on the end face of the sleeve 112 to press the sealing ring 13. When the sealing ring 13 is embedded in the annular process groove 1122, with a suitable radial dimension, the sealing ring 13 can maintain a suitable pressure with the sleeve 112 in the radial direction, thereby achieving a stable sealing effect. In the axial direction, the sealing ring 13 may slip out of the annular process groove 1122. After the pressure ring 14 is provided, it can restrict the position of the sealing ring 13 and maintain pressure on the sealing ring 13, thereby preventing the sealing ring 13 from falling out and ensuring a stable sealing effect on the second end face of the sealing ring 13.

[0055] Of course, when the outer diameter of the pressure ring 14 is larger than the outer diameter of the sleeve 112, the pressure ring 14 can cover the stator mechanism 12, thus restricting the position of the stator mechanism 12 and preventing the stator mechanism 12 from moving on the sleeve 112.

[0056] In some embodiments of rotor assembly 2, such as Figure 4 As shown, the rotor assembly 2 includes a rotor end cover 21, a housing 22, and several magnets 23. The rotor end cover 21 is disposed on one side of the housing 22, and several magnets are arranged circumferentially on the inner wall of the housing 22. The housing 22 is fitted onto the stator mechanism 12, and several magnets 23 surround the stator mechanism 12. There is an air gap between the magnets 23 and the stator mechanism 12. The first end of the motor shaft 3 is connected to the rotor end cover 21.

[0057] Furthermore, the inner side of the rotor end cover 21 is provided with several first grooves for assembling magnets 23, and these first grooves are evenly distributed along the circumference. The first end of the magnet 23 extends into the first groove. During assembly, the spacing between the first ends of each magnet 23 can be quickly adjusted through the first grooves, achieving rapid positioning and assembly of the first ends of the magnets 23. At the same time, during actual operation, the first grooves fix the first ends of the magnets 23, maintaining the position and spacing of the first ends of the magnets 23 and preventing the first ends of the magnets 23 from shifting.

[0058] like Figure 4 As shown, the rotor assembly 2 also includes a retaining magnetic ring 24, which is secured within the housing 22 and located at the end furthest from the rotor end cover 21. The retaining magnetic ring 24 has several second grooves on the side near the magnet 23, evenly distributed along its circumference. The second end of the magnet 23 extends into one of the second grooves. During assembly, the second grooves allow for quick adjustment of the spacing between the second ends of each magnet 23, enabling rapid positioning and assembly of the second ends of the magnets 23. Simultaneously, during actual operation, the second grooves fix the second ends of the magnets 23, maintaining the spacing between them and preventing any misalignment.

[0059] Furthermore, the magnet 23 is fixed from both ends of the magnet 23 by the first groove and the second groove, respectively. The first groove fixes the position of the first end of the magnet 23 and maintains the spacing, while the second groove maintains the spacing of the second end of the magnet 23. This speeds up the assembly of the magnet 23 as a whole and keeps the position of the magnet 23 stable, preventing the magnet 23 from shifting.

[0060] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A water-cooled external rotor motor, characterized in that, The water-cooled external rotor motor includes a stator assembly, a rotor assembly, and a motor shaft; The stator assembly includes a fixed base, a stator mechanism, and a sealing ring. The fixed base includes a stator end cover and a sleeve disposed on the stator end cover. A water-cooling cavity is provided between the inner and outer walls of the sleeve, and an annular process groove is provided at the end of the sleeve for a machining tool to extend into the water-cooling cavity, the annular process groove being connected to the water-cooling cavity; The sealing ring is sealed and embedded in the annular process groove; The stator mechanism is disposed on the sleeve; The rotor assembly is fitted onto the stator mechanism from the side of the stator mechanism opposite to the stator end cover; The motor shaft is rotatably mounted on the sleeve. The first end of the motor shaft protrudes from the end of the sleeve and is connected to the rotor assembly. The second end of the motor shaft protrudes from the stator end cover and is used to output power.

2. The water-cooled external rotor motor as described in claim 1, characterized in that, The annular process groove is located at the junction of the end face of the sleeve and the inner wall of the sleeve, and the first end of the motor shaft passes through the sealing ring.

3. The water-cooled external rotor motor as described in claim 2, characterized in that, The outer circumferential surface of the first end of the sealing ring is provided with an abutting ring that abuts against the end of the sleeve. The end face of the second end of the sealing ring abuts against the sleeve. A limiting ring is provided on the end face of the second end of the sealing ring. The limiting ring extends into the water-cooling cavity, and the inner wall of the limiting ring abuts against the inner wall of the water-cooling cavity.

4. The water-cooled external rotor motor as described in claim 2, characterized in that, A first sealing groove is provided on the outer circumferential surface of the first end of the sealing ring at the position abutting against the sleeve, and a second sealing groove is provided on the end face of the second end of the sealing ring at the position abutting against the sleeve. A sealing ring is provided in the first sealing groove and the second sealing groove.

5. The water-cooled external rotor motor as described in claim 4, characterized in that, The annular process groove extends axially toward the stator end cover to increase its depth. The length of the sealing ring is adapted to the depth of the annular process groove. The inner wall of the sealing ring is provided with a bearing groove for accommodating the bearing.

6. The water-cooled external rotor motor as described in claim 1, characterized in that, The stator assembly also includes a pressure ring, the inner diameter of which is smaller than the outer diameter of the sealing ring, and the pressure ring is disposed on the end face of the sleeve end for pressing the sealing ring.

7. The water-cooled external rotor motor as described in claim 6, characterized in that, The outer diameter of the pressure ring is larger than the outer diameter of the sleeve.

8. The water-cooled external rotor motor as described in claim 1, characterized in that, The stator end cover is provided with a water inlet and a water outlet, both of which are connected to the water-cooling cavity.

9. The water-cooled external rotor motor as described in claim 1, characterized in that, The rotor assembly includes a rotor end cover, a housing, and several magnets. The rotor end cover is disposed on one side of the housing, and the several magnets are arranged circumferentially on the inner wall of the housing. The housing is fitted onto the stator mechanism, and a plurality of magnets surround the stator mechanism. There is an air gap between the magnets and the stator mechanism, and the first end of the motor shaft is connected to the rotor end cover.

10. The water-cooled external rotor motor as described in claim 9, characterized in that, The inner side of the rotor end cover is provided with a plurality of first grooves for assembling magnets, and the plurality of first grooves are evenly distributed along the circumference. The first end of the magnet extends into the first groove; The rotor assembly also includes a magnetic retaining ring, which is retained inside the housing and located at the end away from the rotor end cover. The magnetic retaining ring has a plurality of second grooves on the side near the magnet, and the plurality of second grooves are evenly distributed along the circumference. The second end of the magnet extends into the second groove.

Images