Underwater propeller inner rotor with lightweight design

Abstract

The utility model relates to a lightweight-designed underwater propeller inner rotor, and the inner rotor comprises a rotor yoke which is hollow inside and is provided with a magnet installation part on the outer surface; a shaft hole is formed in the middle of the end plate; the two ends of the rotor yoke are respectively connected with an end plate. The rotating shaft penetrates through the two end plates and the rotor yoke and is connected with the two end plates respectively; and the magnet is mounted on the magnet mounting part. According to the lightweight underwater propeller inner rotor provided by the utility model, the rotor yoke is designed to be hollow, and the overall weight of the inner rotor is greatly reduced, so that the rotational inertia of the inner rotor is reduced, the response speed of control is improved, and the precision requirement of control is reduced; and the rotor yoke is connected with the end plate, so that the rotating shaft is connected with the end plate to drive the rotor yoke to rotate, and the reliability and stability of the overall structure of the inner rotor are ensured.

Description

Technical Field

[0001] This application relates to the technical field of motors, and particularly to an inner rotor of an underwater thruster with a lightweight design. Background Art

[0002] With the continuous development of the underwater power market, various underwater propulsion devices emerge in an endless stream, and the requirements for aligned motors are becoming increasingly strict. For example, for an electric hydrofoil used in water sports, it can lift the skateboard out of the water and is driven by an underwater motor to move. The electric hydrofoil has high requirements for the power density of the motor. Limited by the outer diameter size of the motor, the motor is generally made relatively slender, which results in a significant increase in the length of the inner rotor of the motor, thereby increasing the moment of inertia of the inner rotor. The increase in the moment of inertia will bring many adverse effects to the motor. For example, the larger the moment of inertia, the longer it takes to accelerate or decelerate to the target speed, which may lead to a slower response of the control system; in addition, the increase in the moment of inertia results in a more powerful computing ability and algorithm required by the controller to achieve precise control, leading to an increase in cost. Utility Model Content

[0003] Based on this, it is necessary to provide an inner rotor of an underwater thruster with a lightweight design, and its specific technical solution is as follows.

[0004] An inner rotor of an underwater thruster with a lightweight design, comprising:

[0005] A rotor yoke, which is hollow inside and has a magnet mounting portion on its outer surface;

[0006] End plates, with a shaft hole in the middle; the two ends of the rotor yoke are respectively connected to the end plates;

[0007] A rotating shaft, passing through the two end plates and the rotor yoke, and the rotating shaft is respectively connected to the two end plates;

[0008] Magnets, mounted on the magnet mounting portion.

[0009] Further, the rotor yoke is in a straight cylinder shape.

[0010] Further, the end plate includes an end cover and a first fitting protrusion protruding towards the end cover side; a gap is formed between the first fitting protrusion and the end cover; a yoke stop is provided at the end of the rotor yoke, and the yoke stop is inserted into the gap.

[0011] Further, the outer surface of the first fitting protrusion is bonded to the inner surface of the yoke stop; the inner surface of the end cover is bonded to the outer surface of the yoke stop.

[0012] Further, the first fitting protrusion is provided with a weight reduction hole.

[0013] Further, a plurality of first screw through holes are uniformly arranged in the circumferential direction of the end cover, and a plurality of threaded holes corresponding to the first screw through holes one by one are arranged on the yoke stop; the first set screws pass through the first screw through holes and are connected to the threaded holes, so that the end cover and the rotor yoke are fastened.

[0014] Further, a second fitting protrusion is provided on the side of the end cover away from the first fitting protrusion; a second screw through hole is provided on the second fitting protrusion, and a screw blind hole is provided on the rotating shaft; the rotating shaft passes through the second fitting protrusion, and the second set screw passes through the second screw through hole and is connected to the screw blind hole, so that the end cover and the rotating shaft are fastened.

[0015] Further, positioning posts extending along the axis direction of the rotor yoke are provided on the magnet mounting portion; a plurality of positioning posts are uniformly arranged along the circumferential direction of the rotor yoke to form a plurality of magnet mounting grooves.

[0016] Further, the magnet is divided into at least two segments along the axis direction of the rotor yoke, and each segment of the magnet is adhesively bonded in the magnet mounting groove.

[0017] Further, a glue groove is provided on the rotating shaft, and the rotating shaft is glued to the end cover.

[0018] Beneficial effects: For the inner rotor of the underwater thruster with a lightweight design provided by the present utility model, the rotor yoke is designed to be hollow, greatly reducing the overall weight of the inner rotor, thereby reducing its moment of inertia, improving the response speed of control, and reducing the accuracy requirements of control; and the rotor yoke is connected to the end plate, and the rotating shaft is connected to the end plate to drive the rotor yoke to rotate, ensuring the reliability and stability of the overall structure of the inner rotor. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 It is an exploded view of the inner rotor;

[0021] Figure 2 It is an overall view of the inner rotor;

[0022] Figure 3 It is a view of the rotating shaft;

[0023] Figure 4 It is a view of the rotor yoke;

[0024] Figure 5One of the schematic diagrams of the front end plate;

[0025] Figure 6 Another schematic diagram of the front end plate;

[0026] Figure 7 One of the schematic diagrams of the rear end plate;

[0027] Figure 8 Another schematic diagram of the rear end plate;

[0028] Figure 9 Radial sectional view after the inner rotor and the stator are assembled.

[0029] Explanation of the reference numerals in the drawings: 1. Rotor yoke; 2. Front end plate; 3. Rear end plate; 4. Rotating shaft; 5. Magnet; 6. First set screw; 7. Second set screw; 8. Stator core; 9. Air gap;

[0030] 11. Yoke stop; 12. Positioning post; 13. Magnet mounting groove; 14. Threaded hole;

[0031] 21. Shaft hole; 22. First mating projection; 23. End cover; 24. Gap; 25. Weight reduction hole; 26. First screw through hole; 27. Balancing groove; 28. Second mating projection; 29. Second screw through hole;

[0032] 41. Screw blind hole; 42. Glue groove. Detailed implementation manners

[0033] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0034] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0036] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "joined", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In this application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0038] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0039] Embodiment

[0040] Referring to Figure 1 As shown, this embodiment provides an inner rotor of an underwater thruster with a lightweight design, including a rotor yoke 1, end plates, a rotating shaft 4, and magnets 5.

[0041] Referring to Figure 4As shown, the interior of the rotor yoke 1 is hollow, and a magnet mounting portion is provided on the outer surface of the rotor yoke 1. A plurality of magnets 5 are uniformly arranged circumferentially around the rotor yoke 1 and mounted within the magnet mounting portion. The number of end plates is two, which are divided into a front end plate 2 and a rear end plate 3. The front end plate 2 and the rear end plate 3 are respectively connected to both ends of the rotor yoke 1. Through holes 21 are respectively provided in the middle of the front end plate 2 and the rear end plate 3. The rotating shaft 4 sequentially passes through the front end plate 2, the rotor yoke 1, and the rear end plate 3, and the rotating shaft 4 is respectively connected to the front end plate 2 and the rear end plate 3. After the assembly is completed, it is as shown in Figure 2 shown. When the rotating shaft 4 rotates, it drives the two end plates to rotate, thereby driving the rotor yoke 1 to rotate.

[0042] For the inner rotor of the underwater thruster with a lightweight design provided in this embodiment, the rotor yoke 1 is designed to be hollow, which greatly reduces the overall weight of the inner rotor, thereby reducing its moment of inertia, improving the response speed of control, and reducing the accuracy requirements of control; and the rotor yoke 1 is connected to the end plates, so that the rotating shaft 4 is connected to the end plates to drive the rotor yoke 1 to rotate, ensuring the reliability and stability of the overall structure of the inner rotor.

[0043] Referring to Figure 9 shown, the inner rotor provided in this embodiment is assembled into the stator assembly. The rotor yoke 1, the stator core 8, and the air gap 9 together form a magnetic flux closed loop, which is abbreviated as a magnetic circuit; when the motor operates, the magnetic induction intensity generated by the energized winding is coupled with the magnetic field of the rotor permanent magnet and propagates along the magnetic circuit; among them, as long as the thickness of the rotor yoke 1 ensures that the magnetic flux density is not oversaturated and is within a reasonable range, the rest can be removed to reduce the weight. In this embodiment, the thickness of the rotor yoke 1 is designed to be 3.3 mm. When the motor operates, the magnetic flux density of the rotor yoke 1 ≯ 1.4 Tesla, which is much lower than the saturation magnetic induction intensity of low-carbon steel, ensuring the performance of the motor while reducing the rotor weight, thereby realizing a lightweight design of reducing the rotor inertia and improving the rotor control accuracy.

[0044] Specifically, the rotor yoke 1 is in a straight cylinder shape. A yoke stop 11 is provided at the end of the rotor yoke 1. A plurality of positioning posts 12 arranged along the circumferential direction are provided on the outer surface of the rotor yoke 1, that is, in the magnet mounting portion. These positioning posts 12 extend along the axis direction of the rotor yoke 1 to form a plurality of magnet mounting grooves 13. Due to the above structural characteristics, the rotor yoke 1 provided in this embodiment can be formed by profile extrusion and CNC machining, with higher dimensional accuracy and stronger reliability.

[0045] Specifically, referring to Figure 5 and Figure 6As shown, the front end plate 2 includes an end cover 23 and a first mating protrusion 22 protruding toward one side of the end cover 23; a gap 24 is formed between the first mating protrusion 22 and the end cover 23; the yoke stop 11 is inserted into the gap 24 to mate the front end plate 2 with the rotor yoke 1. The outer surface of the first mating protrusion 22 is in contact with the inner surface of the yoke stop 11, and the inner surface of the end cover 23 is in contact with the outer surface of the yoke stop 11. In this embodiment, the outer surface of the first mating protrusion 22 can be adhesively bonded to the inner surface of the yoke stop 11, and the inner surface of the end cover 23 can be adhesively bonded to the outer surface of the yoke stop 11. In other embodiments, other methods can also be used to connect the front end plate 2 and the rotor yoke 1. In other embodiments, the yoke stop 11 can also be not provided, and the rotor yoke 1 can be directly inserted into the gap 24.

[0046] Specifically, in this embodiment, the first mating protrusion 22 is provided with a weight reduction hole 25 to further reduce the weight of the inner rotor, thereby reducing the moment of inertia. In other embodiments, the weight reduction hole 25 can also be not provided.

[0047] Specifically, a plurality of first screw through holes 26 are uniformly provided in the circumferential direction of the end cover 23, and a plurality of threaded holes 14 corresponding to the first screw through holes 26 one by one are provided on the yoke stop 11; a first set screw 6 passes through the first screw through hole 26 and is connected to the threaded hole 14 to fasten the end cover 23 and the rotor yoke 1.

[0048] Specifically, in this embodiment, the front end cover 23 is further provided with a balance groove 27. In other embodiments, the balance groove 27 can also be not designed and a weight removal balancing process can be adopted instead.

[0049] Specifically, in this embodiment, a second mating protrusion 28 is provided on the side of the end cover 23 away from the first mating protrusion 22; a second screw through hole 29 is provided on the second mating protrusion 28, and a screw blind hole 41 is provided on the rotating shaft 4; the rotating shaft 4 passes through the second mating protrusion 28, and a second set screw 7 passes through the second screw through hole 29 and is connected to the screw blind hole 41 to fasten the end cover 23 and the rotating shaft 4. In other embodiments, other methods can also be used to connect the front end plate 2 and the rotating shaft 4, such as using D-shaped holes, hot sleeve assembly, cold sleeve assembly, etc.

[0050] In this embodiment, referring to Figure 7 and Figure 8 As shown, the structure of the rear end cover 23 is basically similar to that of the front end cover 23, so it will not be elaborated in this embodiment.

[0051] Specifically, the magnets 5 are respectively installed in the magnet installation grooves 13, and in one magnet installation groove 13, the magnet 5 is divided into two segments along the axis direction of the rotor yoke 1, reducing the processing / technological difficulty caused by the too long length of the magnet 5. In other embodiments, it may not be segmented, or the magnet 5 may be divided into three segments or more than three segments.

[0052] Specifically, a glue groove 42 is further provided on the rotating shaft 4 to glue the rotating shaft 4 and the end cover 23. In other embodiments, the second set screw 7, as well as the second screw through hole 29 and the second blind hole, may also be cancelled.

[0053] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0054] The above-described embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An inner rotor of an underwater thruster with a lightweight design, characterized in that, Including: A rotor yoke, which is hollow inside and has magnet mounting parts on its outer surface; End plates, with shaft holes in the middle; both ends of the rotor yoke are respectively connected with end plates; A rotating shaft, passing through the two end plates and the rotor yoke, and the rotating shaft is respectively connected with the two end plates; Magnets, mounted on the magnet mounting parts.

2. The inner rotor of the underwater thruster with lightweight design according to claim 1, characterized in that The rotor yoke is in a straight cylinder shape.

3. The inner rotor of an underwater thruster with a lightweight design according to claim 1, characterized in that, The end plate includes an end cover and a first fitting protrusion protruding towards the end cover side; a gap is formed between the first fitting protrusion and the end cover; a yoke stop is provided at the end of the rotor yoke, and the yoke stop is inserted into the gap.

4. The inner rotor of an underwater thruster with a lightweight design according to claim 3, characterized in that, The outer surface of the first fitting protrusion is in contact with and glued to the inner surface of the yoke stop; the inner surface of the end cover is in contact with and glued to the outer surface of the yoke stop.

5. The inner rotor of an underwater thruster with a lightweight design according to claim 3, characterized in that, The first fitting protrusion is provided with weight-reducing holes.

6. The inner rotor of an underwater thruster with a lightweight design according to claim 3, characterized in that A plurality of first screw through holes are evenly arranged in the circumferential direction of the end cover, and a plurality of threaded holes corresponding to the first screw through holes one by one are provided on the yoke stop; a first set screw passes through the first screw through hole and is connected with the threaded hole to fasten the end cover and the rotor yoke.

7. The inner rotor of the underwater thruster with lightweight design according to claim 3, characterized in that A second fitting protrusion is provided on the side of the end cover away from the first fitting protrusion; a second screw through hole is provided on the second fitting protrusion, and a screw blind hole is provided on the rotating shaft; the rotating shaft penetrates through the second fitting protrusion, and a second set screw passes through the second screw through hole and is connected with the screw blind hole to fasten the end cover and the rotating shaft.

8. The inner rotor of an underwater thruster with a lightweight design according to claim 1, characterized in that, Positioning columns extending along the axis direction of the rotor yoke are provided on the magnet mounting parts; a plurality of positioning columns are evenly arranged in the circumferential direction of the rotor yoke to form a plurality of magnet mounting grooves.

9. The inner rotor of an underwater thruster with a lightweight design according to claim 8, characterized in that, The magnets are divided into at least two sections along the axis direction of the rotor yoke, and each section of magnet is respectively glued in the magnet mounting groove.

10. The inner rotor of an underwater thruster with a lightweight design according to claim 1, characterized in that, Glue grooves are provided on the rotating shaft, and the rotating shaft is glued to the end cover.

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