Underwater brushless motor

Abstract

The utility model provides an underwater brushless motor. The underwater brushless motor comprises a stator assembly and a rotor assembly. The motor is characterized in that the stator assembly comprises a shell and a stator winding arranged on the inner side of the shell, and sealant wrapping the stator winding in a sealed mode is arranged in the shell; the rotor assembly comprises a rotor cylinder and a magnetic ring arranged on the side wall of the rotor cylinder in a sealed mode. A plurality of integrally formed paddles are arranged on the inner side of the rotor cylinder; at least two ceramic bearings are connected between the stator assembly and the rotor assembly, and the rotor assembly is rotatably connected with the stator assembly through the ceramic bearings. The motor adopts a non-central-spindle and non-support design, and the blades and the rotor cylinder are directly integrally formed, so that water flow and sundries can freely pass through the interior of the motor and are not easily wound by foreign matters such as silk threads, motor faults caused by jamming are reduced, and the system stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, and more specifically to an underwater brushless motor. Background Technology

[0002] Brushless motors are widely used in various underwater propulsion systems due to their high efficiency, reliability, and long lifespan, such as underwater robots, unmanned underwater vehicles (AUVs), reservoir cleaning equipment, and pool cleaners. These underwater propulsion systems not only require motors with excellent waterproof performance but also necessitate a well-designed blade structure to improve propulsion efficiency. Currently, underwater propulsion motors on the market generally adopt a traditional structure, where the blades are fixed to the shaft, and the motor is mounted inside the casing via a triangular bracket. However, this design has the following problems: It is easily entangled by debris: Common floating objects in the underwater environment, such as threads, seaweed, and plastic bags, can easily become entangled between the shaft and the blades, causing the motor to become obstructed or even stop working. Water flow is obstructed, affecting propulsion efficiency: The presence of the shaft and bracket in traditional propulsion systems obstructs water flow through the blades, thus affecting propulsion efficiency. To address these problems, this invention proposes a novel underwater brushless motor solution. Through innovative structural design, it improves the motor's anti-entanglement capability while simultaneously enhancing propulsion efficiency and durability. Utility Model Content

[0003] In view of this, the present invention provides an underwater brushless motor.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An underwater brushless motor includes a stator assembly and a rotor assembly; characterized in that: the stator assembly includes a housing and a stator winding disposed inside the housing, and the housing contains a sealant that seals and encapsulates the stator winding; the rotor assembly includes a rotor cylinder and a magnetic ring sealed on the side wall of the rotor cylinder; the rotor cylinder contains a plurality of integrally formed blades; at least two ceramic bearings are connected between the stator assembly and the rotor assembly, and the rotor assembly is rotatably connected to the stator assembly via the ceramic bearings.

[0006] In a preferred embodiment, the rotor cylinder is a hollow tubular structure, and the multiple blades are integrally formed on the inner side wall of the rotor cylinder. The multiple blades extend inward from the side wall of the rotor cylinder and are staggered and do not contact each other.

[0007] In a preferred embodiment, the outer shell includes a tubular cylindrical body and two covers respectively located on both sides of the cylindrical body. The ceramic bearing is located inside the cover and can be sleeved onto the outside of the rotor cylinder.

[0008] In the preferred embodiment, the sealant is formed by a potting process. The sealant seals and wraps the stator winding and is located inside the cylinder. The rotor cylinder seals and wraps the magnetic ring inside its side wall by a rubber-coating injection molding process. The rotor cylinder is located inside the sealant and is fitted with a clearance between them. The positions of the magnetic ring and the stator winding correspond to each other internally and externally.

[0009] In a preferred embodiment, the cover is provided with a fixing groove that matches the ceramic bearing, and the ceramic bearing is fixed to the cover through the fixing groove.

[0010] In a preferred embodiment, the rotor cylinder has mounting grooves on both sides that match the inner side of the ceramic bearing, and the rotor assembly is fixed in the stator assembly by interference fit between the ceramic bearing and the mounting groove.

[0011] In a preferred embodiment, a base for fixing or connecting a motor is provided on the outer side of the cylinder. As can be seen from the above technical solution, compared with the prior art, this utility model has the following beneficial technical effects:

[0012] The motor features a shaftless and bracketless design, with the blades integrally formed with the rotor cylinder. This allows water and debris to flow freely through the motor's interior, reducing the risk of entanglement by foreign objects such as threads, minimizing motor malfunctions caused by jamming, and improving system stability. The hollow rotor cylinder design allows water to pass directly through the motor's interior, reducing flow resistance and increasing propulsion. Multiple staggered blades that do not contact each other ensure smooth water flow, optimizing hydrodynamic characteristics, improving propulsion efficiency, and enabling the thruster to provide greater thrust with the same power consumption.

[0013] The stator assembly employs a potting sealant process to completely encapsulate the windings, achieving insulation and waterproofing to prevent water ingress that could lead to short circuits or corrosion. The rotor cylinder's magnetic rings utilize a rubber-coated injection molding process to completely seal the rings, preventing moisture ingress and extending their lifespan. Ceramic bearings support the rotor, preventing metal bearings from rusting due to prolonged immersion, thus improving durability and operational stability. The elimination of traditional complex structures such as shafts and supports reduces the number of parts, lowering production difficulty and costs. No additional anti-winding protection measures are required, reducing maintenance needs and improving the motor's long-term reliability. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of 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 only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0015] Figure 1This is a cross-sectional structural diagram of the present invention.

[0016] Figure 2 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 3 This is a schematic diagram of the main structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the exploded structure of this utility model. Figure 1 .

[0019] Figure 5 This is a schematic diagram of the exploded structure of this utility model. Figure 1 .

[0020] Reference numerals: 100, stator assembly; 110, housing; 111, cylinder; 112, cover; 120, stator winding; 130, sealant; 200, rotor assembly; 210, rotor cylinder; 211, blade; 220, magnetic ring; 300, ceramic bearing; 1121, mounting groove; 212, mounting groove; 113, base. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0022] In the description of this application, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] An underwater brushless motor, please refer to Figure 1-5This invention can typically be used as an underwater propulsion device, with the motor fixed to a surface device or vehicle to provide propulsion power. It includes a stator assembly 100 and a rotor assembly 200. The stator assembly 100 includes a housing 110 and a stator winding 120 disposed inside the housing 110. The housing 110 is made of plastic or other waterproof material to ensure overall waterproof performance. The stator winding 120 is disposed inside the housing 110 and sealed with sealant 130 to achieve insulation and waterproofing. The rotor assembly 200 includes a rotor cylinder 210 and a magnetic ring 220 sealed on the side wall of the rotor cylinder 210. The rotor cylinder 210 is a hollow tubular structure with multiple integrally formed blades 211 on its inner side. The magnetic ring 220 is sealed on the side wall of the rotor cylinder 210 to prevent moisture from entering the magnetic ring 220 and affecting its performance. The integrally formed blades 211 on the rotor cylinder 210 ensure the stability of the rotor during operation and improve production efficiency. Compared with the blade structure that is installed and connected separately, it can avoid blade swaying or even falling off. Two ceramic bearings 300 are provided between the stator assembly 100 and the rotor assembly 200. The rotor assembly 200 is rotatably connected to the stator assembly 100 through the ceramic bearings 300. The rotation of the rotor cylinder 210 is realized by the cooperation of the magnetic ring 220 and the stator winding 120, so as to provide power to various water equipment or vehicles underwater.

[0025] Furthermore, the rotor cylinder 210 is a hollow tubular structure, with multiple blades 211 integrally formed on the inner side wall of the rotor cylinder 210. The multiple blades 211 extend inward from the side wall of the rotor cylinder 210, and the blades 211 are staggered and do not contact each other. In this embodiment, the rotor cylinder 210 has four blades 211 on its inner side, which are spirally distributed along the inner wall of the rotor cylinder 210 and have an arc to improve propulsion efficiency. In other embodiments, the innermost ends of each blade 211 are spaced apart, forming a channel in the center of the rotor cylinder 210, which makes the water flow smoother. The structure of the rotor cylinder 210 does not require a traditional shaft and support structure. This design significantly reduces the risk of the motor being entangled by wires and debris when operating underwater. Since the water flow can pass through the rotor assembly 200 and the blades 211, even if debris enters, it will not jam the motor. It will pass through the gaps between the blades 211 and the central channel, ensuring the stable operation of the motor and improving reliability. In other embodiments, the blades 211 can be radially distributed or have a variable spacing distribution. In addition, the number and shape of the blades 211 can also be changed according to actual requirements to achieve different thrust, energy efficiency, stability, etc. provided by the motor.

[0026] Furthermore, the outer casing 110 includes a tubular cylindrical body 111 and two covers 112 respectively located on both sides of the cylindrical body 111. The ceramic bearing 300 is located inside the cover 112 and can be sleeved to connect to the outside of the rotor cylinder 210. The sealant 130 is formed by a potting process. The sealant 130 seals and wraps the stator winding 120 and fixes it to the inside of the cylindrical body 111. The rotor cylinder 210 seals and wraps the magnetic ring 220 inside its side wall by a rubber-coating injection molding process. The rotor cylinder 210 is located inside the sealant 130 and is clearance-fitted to each other. The positions of the magnetic ring 220 and the stator winding 120 correspond to each other internally and externally. Encapsulation refers to injecting epoxy resin, polyurethane, silicone, etc., into the interior of electronic components or coils, allowing it to cure and form a protective layer. Generally, the windings are first encapsulated to ensure insulation and waterproofing, and then injection molding is used to form a sealant 130 that wraps around the stator winding 120. Similarly, encapsulation injection molding is an injection molding process that coats a rigid component with a soft or other material. The structure and manufacturing process of the rotor cylinder 210 and the sealant 130 effectively isolate moisture, preventing metal parts from rusting and corroding, ensuring that both can function normally underwater. Encapsulation and encapsulation processes prevent the stator winding 120 and magnetic ring 220 from being directly exposed to water or the external environment, improving durability. The stator winding 120 and the magnetic ring 220 correspond to each other and generate rotational torque through the interaction of magnetic induction and magnetic field, thereby driving the rotor cylinder 210 to move. The stator winding 120 includes multiple electromagnetic coils, usually a three-phase winding. Current flows into the stator winding 120 to form a magnetic field. The magnetic ring 220 is in the magnetic field and is affected by the magnetic field of the stator winding 120, thereby driving the rotor cylinder 210 to rotate. Changing the energizing sequence of the stator winding 120 controls the forward and reverse rotation of the rotor cylinder 210. In addition, in order to ensure the normal energizing of the stator winding, the power supply leads of the stator winding 120 are usually reserved and led out with sealant 130 or shell 110 before potting. During potting, the sealant is used to wrap the winding but not cover the lead outlet to ensure that the electrical connection is usable. The lead outlet is usually sealed with waterproof connectors, sealing rings or epoxy resin to prevent water from entering.

[0027] Furthermore, the cover 112 is provided with a fixing groove 1121 that matches the ceramic bearing 300, and the ceramic bearing 300 is fixed to the cover 112 through the fixing groove 1121. The rotor cylinder 210 has mounting grooves 212 on both sides that match the inner side of the ceramic bearing 300. The rotor assembly 200 is fixed inside the stator assembly 100 by an interference fit between the ceramic bearing 300 and the mounting grooves 212. Normally, during motor installation, the ceramic bearing 300 is pre-installed on the cover 112 through the fixing grooves 1121. Then, the mounting grooves 212 of the rotor cylinder 210 are aligned with the ceramic bearing 300 and inserted. Next, the cylinder 111, which has been sealed with sealant 130, is fitted on, and finally, the cover 112 on the other side is closed. The cylinder 111 and the cover 112 are fixed together with screws. The rotor cylinder 210 is rotatably connected on both sides by the ceramic bearing 300, ensuring its rotational stability. The ceramic material of the ceramic bearing 300 ensures its waterproof and durable performance underwater. The outer side of the cylinder 111 is provided with a base 113 for fixing or connecting the motor. The motor can be easily fixed to the water vehicle or equipment to be connected through the base 113. At the same time, the motor's lead wire can be extended through the base 113 to the vehicle or equipment for power connection.

[0028] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An underwater brushless motor comprising a stator assembly (100) and a rotor assembly (200); characterized in that: The stator assembly (100) comprises a housing (110) and a stator winding (120) arranged inside the housing (110), and the housing (110) is internally provided with a sealing glue (130) for sealing the stator winding (120); the rotor assembly (200) comprises a rotor cylinder (210) and a magnetic ring (220) sealingly arranged on the side wall of the rotor cylinder (210); the inner side of the rotor cylinder (210) is provided with a plurality of integrally formed paddles (211); the stator assembly (100) and the rotor assembly (200) are connected by at least two ceramic bearings (300), and the rotor assembly (200) is rotatably connected to the stator assembly (100) through the ceramic bearings (300).

2. An underwater brushless motor according to claim 1, characterized in that: The rotor cylinder (210) is a hollow tubular structure, and the plurality of paddles (211) are integrally formed on the inner side of the side wall of the rotor cylinder (210), and the plurality of paddles (211) extend inwardly from the side wall of the rotor cylinder (210) and are staggered and do not contact each other.

3. An underwater brushless motor according to claim 1, characterized in that: The housing (110) comprises a tubular cylinder body (111) and two cover bodies (112) arranged on both sides of the cylinder body (111), respectively, the ceramic bearing (300) is arranged on the inner side of the cover body (112) and can be sleeved and connected to the outer side of the rotor cylinder (210).

4. An underwater brushless motor according to claim 3, characterized in that: The sealing glue (130) is formed by a glue pouring process, the sealing glue (130) sealingly wraps the stator winding (120) and is arranged on the inner side of the cylinder body (111), the rotor cylinder (210) is sealingly wrapped with the magnetic ring (220) on the side wall thereof by a glue injection molding process, the rotor cylinder (210) is located on the inner side of the sealing glue (130) and is gap-fitted with each other, and the magnetic ring (220) and the stator winding (120) are located inside and outside each other.

5. An underwater brushless motor according to claim 4, characterized in that: The cover body (112) is provided with a fixing groove (1121) matched with the ceramic bearing (300), and the ceramic bearing (300) is fixed on the cover body (112) through the fixing groove (1121).

6. An underwater brushless motor according to claim 5, characterized in that: The two sides of the rotor cylinder (210) are respectively provided with a mounting groove (212) matched with the inner side of the ceramic bearing (300), and the rotor assembly (200) is fixed in the stator assembly (100) by interference fit connection of the ceramic bearing (300) and the mounting groove (212).

7. An underwater brushless motor according to claim 6, characterized in that: The outer side of the cylinder body (111) is provided with a base (113) for fixing or connecting the motor.

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