An outer rotor motor for an underwater robot

Abstract

This utility model discloses an external rotor motor for underwater robots, including a base and a housing. The base has a stator assembly and a rotatable shaft. One end of the shaft has a rotor assembly, which is fitted around the stator assembly with a clearance fit. The housing is fitted around the rotor assembly. A limiting groove is provided on the outer wall of the base, and a sealing ring is provided within the limiting groove. The housing fits around the base and seals against the sealing ring. A sealing groove is provided on the outer wall of the base, and a wire passage hole is provided within the sealing groove. A sealing silicone is provided within the sealing groove. This utility model uses a sealing silicone filling method, eliminating the need for applying waterproof adhesive, simplifying the process, shortening the manufacturing cycle, reducing manufacturing costs, and improving the assembly efficiency of the motor.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to an external rotor motor for underwater robots. Background Technology

[0002] Underwater robots, also known as remotely operated vehicles (ROVs), are robots designed for extreme underwater operations. Given the harsh and dangerous underwater environment and the limited diving depth of humans, underwater robots have become an important tool for ocean exploration.

[0003] Underwater robots typically have multiple motors installed, each used to drive the robot forward or perform other tasks. Because underwater robots operate underwater, all motors used in them need to be waterproofed. Current methods usually involve potting adhesive at the cable exit points of the base and applying waterproof adhesive to the connection between the base and the outer shell. While this method meets the waterproofing requirements for underwater operation, the potting process is complex, time-consuming, and impacts assembly efficiency, resulting in high costs. Applying waterproof adhesive at the base-outer shell connection is also cumbersome, leading to low assembly efficiency. Utility Model Content

[0004] To address some or all of the problems existing in the prior art, this utility model provides an external rotor motor for underwater robots, comprising a base and a housing. The housing is connected to the base. The base is provided with a stator assembly and a rotatable shaft. One end of the shaft is provided with a rotor assembly. The rotor assembly is sleeved around the stator assembly, and the rotor assembly and the stator assembly are in clearance fit. The housing is sleeved around the rotor assembly. A limiting groove is provided on the outer side wall of the base, and a sealing ring is provided in the limiting groove. The housing is sleeved around the base and seals against the sealing ring. A sealing groove is provided on the outer side wall of the base, and a wire passage hole is provided in the sealing groove. A wire harness is passed through the wire passage hole, and sealing silicone is provided in the sealing groove.

[0005] As a further improvement of this utility model, the outer peripheral sidewall of the base is provided with a limiting step surface, the outer shell is sleeved on the periphery of the base, and the end face of the outer shell abuts against the limiting step surface.

[0006] As a further improvement of this utility model, a hollow column is provided on the base, the hollow column is coaxially arranged with the base, the stator assembly is sleeved around the hollow column, and the rotating shaft passes through the hollow column and is rotatably connected to the hollow column.

[0007] As a further improvement of this utility model, at least two bearings are sleeved around the outer periphery of the rotating shaft, and the bearings are respectively connected to the hollow column.

[0008] As a further improvement of this utility model, the front end face of the base is provided with a mounting groove, and an oil seal is provided in the mounting groove, the oil seal being slidably sealed to the rotating shaft.

[0009] As a further improvement of this utility model, the mounting groove is provided with a secondary groove, the secondary groove is provided with a fixing cover, and the end of the rotating shaft away from the rotor assembly extends out of the fixing cover.

[0010] As a further improvement of this utility model, the stator assembly includes a stator core, which is fixedly connected to the base. An induction coil is provided on the stator core, and the induction coil is electrically connected to the wire harness.

[0011] As a further improvement of this utility model, the rotor assembly includes a housing, which is connected to the rotating shaft. A magnet mounting frame is provided inside the housing, and multiple permanent magnets are arranged in a circumferential array on the magnet mounting frame. The permanent magnets are distributed around the stator core and are in clearance fit with the stator core.

[0012] As a further improvement of this utility model, the magnet mounting bracket has multiple hollowed-out notches at both ends, which are used to install dynamic balancing mud.

[0013] As a further improvement of this utility model, the hollowed-out notches are distributed in a circular array at both ends of the magnet mounting frame.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention achieves sufficient waterproofing for the wire passage by filling the sealing groove with sealing silicone and by setting a sealing ring at the connection between the outer shell and the base. Actual testing shows a waterproof rating of IP68, meeting the operational requirements of underwater robots. Compared to glue-pouring, this method of filling with sealing silicone simplifies the process, shortens the manufacturing cycle, and reduces manufacturing costs. Furthermore, the connection between the base and the outer shell eliminates the need for additional waterproof adhesive, simplifying assembly and improving motor assembly efficiency. Attached Figure Description

[0016] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1This is a schematic diagram of the external structure of an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of an embodiment of this utility model;

[0019] Figure 3 This is an exploded structural diagram of an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of the base structure in an embodiment of this utility model;

[0021] Figure 5 This is a schematic diagram of the base from another perspective in an embodiment of this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of the magnet mounting bracket and the permanent magnet in an embodiment of this utility model. Detailed Implementation

[0023] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used in the specification is for the purpose of describing particular embodiments only and is not intended to limit the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects, not to describe a particular order.

[0024] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0026] like Figure 1-6As shown, an external rotor motor for an underwater robot includes a housing 1 and a base 2. The housing 1 is fixedly connected to the base 2. A stator assembly and a rotatable shaft 3 are mounted on the base 2. A rotor assembly is mounted on one end of the shaft 3. The rotor assembly is sleeved around the stator assembly, and the rotor assembly and the stator assembly are in clearance fit. During operation, the rotor assembly is driven to rotate by supplying power to the stator assembly, which in turn drives the shaft 3 to rotate, thereby realizing the function of driving external devices to work.

[0027] The outer casing 1 is fitted around the rotor assembly. A limiting groove 21 is provided on the outer side wall of the base 2, and a sealing ring 4 is fixedly installed within the limiting groove 21. The outer casing 1 is fitted onto the outer side of the base 2 and threadedly connected to it. The inner side wall of the outer casing 1 is in sealing contact with the sealing ring 4. By providing the sealing ring 4 on the base 2, the outer casing 1 and the base 2 can be sealed together, meeting the waterproof performance requirements for underwater operation. This eliminates the need for additional waterproof adhesive, simplifies the assembly process, and improves the assembly efficiency of the motor.

[0028] The outer wall of the base 2 is provided with a sealing groove 22, and three wire passage holes 23 are provided in the sealing groove 22. Wire harnesses 5 are respectively passed through the wire passage holes 23. The wire harnesses 5 are used to connect external control equipment and power supply. Sealing silicone is provided in the sealing groove 22. By filling the sealing groove 22 with sealing silicone, the wire passage holes 23 have sufficient waterproof performance to meet the requirements of underwater operation.

[0029] Actual testing showed that by adding sealing ring 4 and sealing silicone, the waterproof rating of the external rotor motor for this underwater robot can reach IP68, which fully meets the operational requirements of the underwater robot. Compared with the potting method, the method of filling with sealing silicone simplifies the process, shortens the manufacturing cycle, and reduces manufacturing costs; moreover, there is no need to apply waterproof adhesive at the connection between the base 2 and the outer shell 1, which simplifies the assembly process and improves the assembly efficiency of the motor.

[0030] To limit the installation position of the outer shell 1, a limiting step surface 24 is provided on the outer peripheral side wall of the base 2. During the assembly of the base 2 and the outer shell 1, the outer shell 1 is fitted onto the outer periphery of the base 2. By tightening the mating threads, the outer shell 1 will screw into the base 2 until the end face of the outer shell 1 abuts against the limiting step surface 24, thus fixing the outer shell 1 and the base 2 in place. By providing the limiting step surface 24 on the base 2, the position of the outer shell 1 fitted into the base 2 can be limited, thereby improving the structural stability of the external rotor motor used in this underwater robot.

[0031] A hollow column 25 is provided on the base 2, and the hollow column 25 is coaxially arranged with the base 2. The stator assembly is sleeved around the hollow column 25, and the rotating shaft 3 passes through the hollow column 25 and is rotatably connected to the hollow column 25. Specifically, two bearings 6 are sleeved on the outer periphery of the rotating shaft 3, and the outer rings of the two bearings 6 are fixedly connected to the hollow column 25 respectively; through the two bearings 6, the rotating shaft 3 can rotate freely within the hollow column 25. In other embodiments, the number of bearings 6 can also be any other arbitrary number.

[0032] The stator assembly includes a stator core 7, which is fixedly sleeved around the hollow column 25 and coaxially arranged with the hollow column 25. An induction coil (not shown in the figure) is wound on the stator core 7. A control circuit board (not shown in the figure) is mounted on the base 2. The induction coil and the wiring harness 5 are electrically connected to the control circuit board. During operation, a power supply and control equipment are connected externally through the wiring harness 5. The external control equipment sends a control signal to the control circuit board, which then energizes the induction coil, causing the stator core 7 to generate magnetism. Under the action of the magnetic force, the rotor assembly can be driven to rotate, thereby driving the rotating shaft 3 to rotate and drive the external device to work.

[0033] The rotor assembly includes a housing 8, which is fixedly connected to the rotating shaft 3. A magnet mounting bracket 9 is fixedly installed inside the housing 8. Multiple permanent magnets 10 are arranged in a circumferential array on the magnet mounting bracket 9. The permanent magnets 10 are distributed around the stator core 7 and are in clearance fit with the stator core 7. During operation, when the induction coil is energized, the stator core 7 becomes magnetic. Under the magnetic force of the stator core 7 and the permanent magnets 10, the magnet mounting bracket 9 drives the housing 8 to rotate, simultaneously driving the rotating shaft 3 to rotate, thus enabling the drive of external devices.

[0034] To seal the area where the shaft 3 extends from the base 2, a mounting groove 26 is provided on the front end face of the base 2. An oil seal 11 is installed inside the mounting groove 26, and the oil seal 11 is fitted around the shaft 3 and slidably sealed to it. By setting the oil seal 11, the area where the shaft 3 extends from the base 2 can be sealed, ensuring its waterproof performance.

[0035] The mounting groove 26 is provided with a secondary groove 27, and a fixing cover 12 is installed in the secondary groove 27. By installing the fixing cover 12 on the secondary groove 27, the oil seal 11 can be sealed in the mounting groove 26, avoiding the problem of axial movement of the oil seal 11 during use and improving the stability of the structure.

[0036] To facilitate the dynamic balance adjustment of the external rotor motor for the underwater robot, multiple hollow notches 91 are provided at both ends of the magnet mounting frame 9. These notches 91 are used to install dynamic balancing mud. During testing after the external rotor motor for the underwater robot is assembled, if the rotor assembly exhibits dynamic imbalance during rotation, balancing mud can be filled into the corresponding hollow notches 91 on the magnet mounting frame 9, thereby restoring the dynamic balance of the external rotor motor for the underwater robot. The hollow notches 91 facilitate dynamic balance adjustment of the external rotor motor for the underwater robot, improving operational convenience.

[0037] In this embodiment, the hollowed-out notches 91 are distributed in a circular array at both ends of the magnet mounting bracket 9; in other embodiments, the hollowed-out notches 91 can also be distributed in other ways, as long as it can be filled with balancing mud.

[0038] The above-described specific embodiments are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. An outer rotor motor for an underwater robot, characterized by: The device includes a base and a housing, the housing being connected to the base. The base has a stator assembly and a rotatable shaft, one end of the shaft having a rotor assembly. The rotor assembly is fitted around the stator assembly with a clearance fit. The housing is fitted around the rotor assembly. The outer wall of the base has a limiting groove with a sealing ring inside. The housing is fitted around the base and seals against the sealing ring. The outer wall of the base is provided with a sealing groove, the sealing groove is provided with a wire hole, the wire harness is passed through the wire hole, and the sealing groove is provided with sealing silicone.

2. The outer rotor electric motor for underwater robots according to claim 1, characterized in that: The outer peripheral sidewall of the base is provided with a limiting step surface, and the outer shell is sleeved on the periphery of the base, with the end face of the outer shell abutting against the limiting step surface.

3. The outer rotor electric motor for underwater robots according to claim 1, characterized in that: The base has a hollow column, which is coaxially arranged with the base. The stator assembly is sleeved around the hollow column. The rotating shaft passes through the hollow column and is rotatably connected to the hollow column.

4. The outer rotor electric motor for underwater robots according to claim 3, characterized in that: At least two bearings are fitted around the outer periphery of the rotating shaft, and the bearings are respectively connected to the hollow column.

5. The outer rotor electric motor for underwater robots according to claim 1, characterized in that: The base has a mounting groove on its front end face, and an oil seal is provided in the mounting groove. The oil seal is slidably sealed to the rotating shaft.

6. The outer rotor electric motor for underwater robots according to claim 5, characterized in that: The mounting slot is provided with a secondary slot, and the secondary slot is provided with a fixing cover. The end of the rotating shaft away from the rotor assembly extends out of the fixing cover.

7. The outer rotor electric motor for underwater robots according to any of claims 1-6, characterized in that: The stator assembly includes a stator core, which is fixedly connected to the base. An induction coil is provided on the stator core, and the induction coil is electrically connected to the wire harness.

8. The outer rotor electric motor for underwater robots according to claim 7, characterized in that: The rotor assembly includes a housing connected to the rotating shaft. A magnet mounting frame is provided inside the housing. Multiple permanent magnets are arranged in a circumferential array on the magnet mounting frame. The permanent magnets are distributed around the stator core and are in clearance fit with the stator core.

9. The outer rotor electric motor for underwater robots according to claim 8, characterized in that: The magnet mounting bracket has multiple hollowed-out notches at both ends, which are used to install dynamic balancing mud.

10. The outer rotor electric motor for underwater robots according to claim 9, characterized in that: The perforated notches are arranged in a circular array at both ends of the magnet mounting frame.

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