Hall protection structure of an immersed brushless direct current motor

Abstract

The utility model relates to motor structure design field especially relates to a kind of Hall protection structure of immersion liquid brushless DC motor, including casing, fixed plate, end cover, stator assembly, stator sheath, Hall device and Hall shield, stator sheath is hollow cylinder with hollow disc in one end and is uniformly provided with positioning protrusion on outer circumferential surface along the circumference, and the fixed plate on the inner surface of the front end of casing is fixed in one end of stator sheath with hollow disc, stator assembly is installed between stator sheath and casing, Hall shield is installed in end cover inner surface and forms sealed cavity with end cover, Hall device is placed in cavity. The protection structure designed in the utility model is convenient to install, and the structure is stable, and the sealing is good, can ensure that stator assembly and Hall device are not directly contacted with coolant, so that immersion liquid brushless DC motor can work stably for a long time, improve the working reliability of motor.

Description

Technical Field

[0001] This utility model relates to the field of motor structure design, and in particular to a Hall protection structure for a liquid-immersed brushless DC motor. Background Technology

[0002] Brushless DC motors use electronic commutation instead of the brush commutation of traditional brushed DC motors, effectively avoiding the commutation sparking problem present in brushed DC motors and improving operational reliability. In recent years, technological breakthroughs in permanent magnet materials, switching devices, and control chips have led to the rapid development of brushless DC motors. As an electromechanical integrated product, it possesses the advantages of traditional DC motors, such as excellent speed regulation performance and simple control, while also having the advantages of AC motors, such as simple structure, ease of maintenance, and reliable operation, making it widely used in industrial fields.

[0003] With the rise of the all-electric aircraft concept, research on the application of brushless DC motors in aircraft has attracted attention. Due to the size and weight requirements of aircraft equipment, the power density of brushless DC motors used in aircraft is often designed to be very high, thus requiring consideration of motor heat dissipation. Immersion in coolant offers advantages such as high heat dissipation efficiency and ease of operation; however, because coolant is corrosive, direct contact with armature windings, Hall effect devices, etc., can corrode these components, leading to motor malfunction or even danger. Therefore, appropriate protective structures are needed. Existing protective structures cannot simultaneously achieve both structural simplicity and good sealing, hindering the widespread application of liquid-immersed motors. Therefore, research on Hall effect protection structures for liquid-immersed brushless DC motors is meaningful. Utility Model Content

[0004] To address the aforementioned issues, this invention proposes a Hall effect protection structure for a liquid-immersed brushless DC motor. This structure is easy to install, structurally stable, and has good sealing properties, ensuring that the Hall effect sensors and stator components are not corroded by the coolant, thereby improving the motor's operational reliability and extending its service life.

[0005] The technical solution of this utility model is as follows: In order to achieve the above-mentioned utility model objectives, this utility model proposes a Hall protection structure for a liquid-immersed brushless DC motor, including a housing, a fixing plate, an end cover, a stator assembly, a stator sleeve, a Hall device, and a Hall shield. The stator sleeve is a hollow cylinder with a hollow disk at one end and positioning protrusions are evenly arranged along the circumferential direction on its outer circumferential surface. The end of the stator sleeve with the hollow disk is fixed to the fixing plate on the inner surface of the front end of the housing. The stator assembly is installed between the stator sleeve and the housing. The Hall shield is installed on the inner surface of the end cover and forms a sealed cavity with the end cover. The Hall device is placed in the cavity.

[0006] Furthermore, the housing and the fixing plate are an integral structure, the outer diameter of the fixing plate is slightly larger than the inner diameter of the stator sleeve, the stator sleeve and the fixing plate are interference fit, and the end of the stator sleeve with the hollow disc is glued to the inner surface of the front end of the housing with sealant.

[0007] Furthermore, an armature winding is wound on the stator core. The stator core and the armature winding constitute a stator assembly. The stator assembly is placed according to the correspondence between the positioning protrusions and the slots of the stator core, and the entire stator assembly is potted with epoxy resin.

[0008] Furthermore, each positioning protrusion evenly arranged circumferentially on the outer circumferential surface of the stator sheath can be inserted into the slot of the stator core without contacting the armature winding.

[0009] Furthermore, the Hall effect shield and the end cover are sealed by two sealing rings, and the end cover and the housing are sealed by one sealing ring.

[0010] Furthermore, both the Hall effect device and the Hall effect shield are bonded to the inner surface of the end cap using sealant.

[0011] Furthermore, both the stator sheath and the Hall effect shield are made of carbon fiber.

[0012] The technical advantages of this invention are as follows: The protective mechanism designed in this invention utilizes a fixing plate to facilitate the installation of the stator sleeve and ensure a tight fit between the stator sleeve and the housing. The circumferentially evenly distributed positioning protrusions on the outer surface of the stator sleeve allow the stator sleeve and stator core to engage, facilitating stator assembly installation and enhancing overall structural stability. The installation of the stator sleeve and the encapsulation with epoxy resin completely isolate the stator assembly from the coolant. The installation of the Hall effect shield and the design of the sealing ring ensure that the coolant will not corrode the Hall effect devices and will not leak. The entire stator protection structure is easy to install, structurally stable, and has good sealing performance, ensuring that the stator assembly and Hall effect devices do not directly contact the coolant. This allows the liquid-immersed brushless DC motor to operate stably for extended periods, improving the motor's reliability. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the Hall protection structure of the liquid-immersed brushless DC motor of this utility model.

[0014] Figure 2 This is a schematic diagram of the cross-section of the stator core.

[0015] Figure 3 This is a schematic diagram of the stator sheath.

[0016] Figure 4 This is a structural diagram of the Hall effect shield.

[0017] The components include: housing 1, fixing plate 2, stator sleeve 3, positioning protrusion 3-1, stator assembly 4, stator core 4-1, armature winding 4-2, end cover 5, Hall effect shield 6, Hall effect device 7, sealing ring 8-1, sealing ring 8-2, sealing ring 8-3, and epoxy resin 9. Detailed Implementation

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings or specific implementation examples. It should be noted that some (but not all) of the disclosed examples are shown in the drawings. In fact, many different examples can be described, and these examples should not be construed as limited to the examples set forth herein. Rather, these examples are described to better demonstrate the positive effects of this utility model, and all aspects not detailed herein are considered to be well-known or conventional techniques in the art.

[0019] See appendix Figure 1 , Figure 1 This is a schematic diagram of the Hall protection structure of the liquid-immersed brushless DC motor of this utility model. The Hall protection structure of the liquid-immersed brushless DC motor designed in this utility model includes a housing 1, a fixing plate 2, a stator sleeve 3, a stator assembly 4, an end cover 5, a Hall shield 6, and a Hall device 7.

[0020] like Figure 1 As shown, the housing 1 and the fixing plate 2 are integrally made. The stator sleeve 3 is installed on the inner surface of the front end of the housing 1. The stator assembly 4 is placed between the stator sleeve 3 and the housing 1. The Hall shield 6 and the end cover 5 are fastened together to form a cavity. The Hall device 7 is placed in the cavity. The Hall shield 6 and the end cover 5 are sealed, and the end cover 5 and the housing 1 are sealed. The materials used for the stator sleeve 3 and the Hall shield 6 are both carbon fiber.

[0021] Figure 2 and Figure 3 These are, respectively, a cross-sectional schematic diagram of the stator core 4-1 and a structural schematic diagram of the stator sheath 3. For example... Figure 3 As shown, the stator sleeve 3 is a hollow cylinder with a hollow disc at one end. Positioning protrusions 3-1 are evenly distributed circumferentially on its outer circumferential surface. The number of positioning protrusions 3-1 is the same as the number of slots in the stator core 4-1. Each positioning protrusion 3-1 can be inserted into a slot in the stator core 4-1 without contacting the armature winding 4-2. The outer diameter of the fixing plate 2 is slightly larger than the inner diameter of the stator sleeve 3. The end of the stator sleeve 3 with the hollow disc is bonded to the inner front surface of the housing 1 with sealant and uses an interference fit with the fixing plate 2, making installation relatively convenient and the structure stable.

[0022] An armature winding 4-2 is wound on the stator core 4-1. The stator core 4-1 and the armature winding 4-2 constitute the stator assembly 4. The stator assembly 4 is placed according to the correspondence between the positioning protrusion 3-1 and the slot of the stator core 4-1. The entire stator assembly 4 is potted with epoxy resin 9.

[0023] Figure 4 This is a structural diagram of the Hall effect shield. The Hall device 7 is bonded to the inner surface of the end cap 5 with sealant, and the Hall effect shield 6 is placed on top of it. Sealant is applied to the contact surface between the Hall effect shield 6 and the end cap 5.

[0024] like Figure 4 As shown, the housing 1 has three sealing grooves. One of the sealing grooves is equipped with a sealing ring 8-1 to achieve a seal between the housing 1 and the end cover 5, ensuring that the coolant will not leak. The other two sealing grooves are equipped with sealing rings 8-2 and 8-3 to achieve a seal between the end cover 5 and the Hall shield 6, ensuring that the coolant will not corrode the Hall device.

[0025] The above specific embodiments or examples are only used to explain the technical solutions of this utility model and are not intended to limit this application. Parts not described in detail are considered to be conventional technical means or common knowledge in the field. It can be understood by those skilled in the art that, based on the design concept of this application, adaptive modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications, equivalent substitutions, and adaptive improvements do not depart from the technical essence of this utility model and should all be covered within the protection scope of this application.

Claims

1. A Hall protection structure for a liquid-immersed brushless DC motor, characterized in that, The device includes a housing, a fixing plate, an end cover, a stator assembly, a stator sleeve, a Hall effect device, and a Hall effect shield. The stator sleeve is a hollow cylinder with a hollow disk at one end and positioning protrusions are evenly distributed along the circumferential direction on its outer circumferential surface. The end of the stator sleeve with the hollow disk is fixed to the fixing plate on the inner surface of the front end of the housing. The stator assembly is installed between the stator sleeve and the housing. The Hall effect shield is installed on the inner surface of the end cover and forms a sealed cavity with the end cover. The Hall effect device is placed in the cavity.

2. The Hall protection structure for a liquid-immersed brushless DC motor as described in claim 1, characterized in that, The housing and the fixing plate are an integral structure. The outer diameter of the fixing plate is slightly larger than the inner diameter of the stator sleeve. The stator sleeve and the fixing plate are interference-fitted, and the end of the stator sleeve with the hollow disc is glued to the inner surface of the front end of the housing with sealant.

3. The Hall protection structure for a liquid-immersed brushless DC motor as described in claim 2, characterized in that, Each positioning protrusion evenly arranged circumferentially on the outer circumferential surface of the stator sheath can be inserted into the slot of the stator core without contacting the armature winding.

4. The Hall protection structure for a liquid-immersed brushless DC motor as described in claim 1, characterized in that, An armature winding is wound on the stator core. The stator core and the armature winding constitute the stator assembly. The stator assembly is placed according to the correspondence between the positioning protrusions and the slots of the stator core, and the entire stator assembly is potted with epoxy resin.

5. The Hall protection structure for a liquid-immersed brushless DC motor as described in claim 1, characterized in that, The Hall effect shield is sealed to the end cover by two sealing rings, and the end cover is sealed to the housing by one sealing ring.

6. The Hall protection structure for a liquid-immersed brushless DC motor as described in claim 1, characterized in that, Both the Hall effect device and the Hall effect shield are bonded to the inner surface of the end cap using sealant.

7. The Hall protection structure for a liquid-immersed brushless DC motor as described in claim 1, characterized in that, Both the stator sheath and the Hall effect shield are made of carbon fiber.

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