Coreless motor

Abstract

The utility model provides a coreless motor, which relates to the technical field of coreless motors and comprises a rotor assembly, a stator assembly and a motor casing, a motor shaft is arranged in the center of the rotor assembly, a magnet is sleeved on the rotor assembly, a bearing is arranged on the rotor assembly, the stator assembly is an I-shaped glue pouring coil, and an annular iron core is arranged on the periphery of the stator assembly. A signal magnet is arranged at the bottom of the motor shaft, and a balance ring is arranged in the middle of the motor shaft. The stator coil is internally provided with a winding skeleton, the middle is filled with an elastic washer, and the bottom is a UVW three-phase line. The front bearing is limited by a snap spring, and the rear bearing clings to the wave washer. An end cover is arranged at the bottom of the motor shell and fastened through a screw, and a threaded through hole is formed in the wave washer. The motor performance is improved, the maintenance requirement is reduced, meanwhile, assembling and overhauling are convenient, and the stability and durability of the motor are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hollow cup motor technical field, especially a kind of hollow cup motor. BACKGROUND

[0002] The stator potting process of hollow cup motor has been widely applied in the industry, the stator adopts potting process, which can not only provide a solid protective layer for the motor to prevent corrosion from the external environment, but also provide reliable insulation protection for the motor to prevent current leakage and short circuit, and reduce the risk of failure. At the same time, high-quality potting glue can withstand temperature changes within a certain range. In high-temperature or low-temperature environment, the potting glue will not soften, harden or crack, maintaining its performance stability. In addition to this, the potting glue not only plays a role in bonding and fixing the hollow cup motor, but also provides good protection to prevent the wire set from falling off during high-speed rotation of the motor. Currently, hollow cup motors use glass fiber plate structure during potting process. The glass fiber plate breaks under stress during the potting process, causing potting glue leakage, which affects the service life of the motor.

[0003] The assembly of hollow cup motor is difficult to automate, and current manual assembly is mainly used. The existing assembly process of hollow cup motor stator and rotor leads to low productivity and efficiency of the motor.

[0004] The pre-tightening force of the bearing in the hollow cup motor plays a crucial role, mainly in improving rotational accuracy, stiffness, bearing life, reducing noise, improving dynamic performance, suppressing vibration patterns and friction and wear. Currently, most hollow cup motors use wave washers to increase the pre-tightening force of the bearing. However, due to the difficulty of automation in hollow cup motors, manual work inevitably leads to the problem of missing wave washers.

[0005] Comparative document CN116722702A discloses a hollow cup motor with FPC and its assembly method. The hollow cup motor with FPC includes a stator assembly, a rotor assembly, a flexible circuit board and a housing. The stator assembly is arranged in the housing and has an axial cavity. The rotor assembly is rotatably arranged in the cavity. The flexible circuit board includes a first wiring part and a second wiring part. The second wiring part is adapted to bend relative to the first wiring part. The flexible circuit board is arranged at one end of the housing. The first wiring part is connected to the stator assembly. The second wiring part is adapted to extend out of the housing and connect to a power cord. The second wiring part includes multiple wiring rods. The wiring rods are connected to the edge of the first wiring part and are adapted to bend relative to the first wiring part and extend in the axial direction away from the first wiring part. The utility model improves the stability, reliability and yield of the motor.

[0006] However, the patent still has the following shortcomings: the stator and rotor assembly of the hollow cup motor is still difficult, the problem of glue leakage is not solved, and the wave washer is not installed in the rear bearing, which may cause insufficient motor yield. The cost of manufacturing the PCB board circuit is high, and the circuit is more complex, which may also reduce the torque of the motor.

[0007] Currently, the glass fiber plate structure is used in the pouring process, and the glass fiber plate is brittle and prone to breakage during pouring, resulting in glue leakage defects. Currently, the hollow cup motor is assembled by tightening the motor shell screws under the action of the bearing pre-tightening force, which may cause the end cover and motor shell screw to be tilted and not in place, resulting in differences in the motor assembly position, making it difficult to ensure the stability and consistency of the quality. After the hollow cup motor is assembled, it cannot be confirmed from the appearance whether the wave washer has been assembled. If the wave washer is missing, the bearing will not have pre-tightening force, which will reduce the service life of the bearing and cause noise in the motor. Practical new type content

[0008] Based on the poor brittleness of the glass fiber plate structure pouring process and the possibility of motor shell screw problems during installation of the hollow cup motor, the utility model designs a hollow cup motor, relating to the technical field of hollow cup motors, comprising a rotor assembly, a stator assembly and a motor shell. The motor shell is provided with a cavity penetrating along the axis, the rotor assembly is arranged at the center of the cavity, the stator assembly is installed inside the motor shell and tightly adheres to the motor shell, and a certain gap is provided between the rotor assembly and the stator assembly. The center of the rotor assembly is provided with a motor shaft sleeve and a magnet, and a bearing is arranged. The stator assembly is a hollow cylinder, the main part is a I-shaped glue pouring line package, and an annular iron core is arranged on the periphery.

[0009] Preferably, the magnet of the rotor assembly is wrapped with a protective sleeve, a step limit is arranged at the left side of the motor shaft and the magnet installation position, and the outer diameter of the magnet and the protective sleeve is smaller than the inner diameter of the stator assembly. The high coercive force and high magnetic field strength of the magnet help to improve the dynamic performance and output torque of the motor. Due to the high corrosion resistance and oxidation resistance of the magnet, the maintenance requirement of the motor is reduced, and the long-term operation cost is reduced.

[0010] Preferably, a front bearing is arranged on the front side of the motor shaft step of the rotor assembly, a rear bearing is arranged on the rear side of the motor shaft, and the outer diameter of the rear bearing is smaller than the inner diameter of the stator assembly.

[0011] Preferably, the bottom of the motor shaft is provided with a cylindrical groove, a signal magnet is arranged inside the cylindrical groove, a balance ring is arranged between the magnet and the rear bearing, and the outer diameter of the balance ring is much smaller than the rear bearing. The signal magnet can be used for positioning the motor and feedback of the sensor, improving the accuracy and response speed of the motor operation; the balance ring can reduce electromagnetic interference during the operation of the motor, improving the safety and stability of the motor.

[0012] Preferably, the inside of the glue-filling wire package of the stator assembly is provided with a wire winding framework, the annular core is filled with an elastic washer in the middle of the glue-filling wire package, and the bottom of the glue-filling wire package is a UVW three-phase wire.

[0013] Preferably, the front bearing is arranged on the front side of the step and is provided with a snap spring limit, the snap spring is arranged in the groove at the tail of the motor shell, and the rear bearing is tightly attached to a wave washer. The snap spring 2 limit can prevent the bearing from moving along the axial direction, ensure the correct position of the bearing on the shaft, and increase the safety and stability of the structure; the wave shape design of the wave washer can uniformly distribute the load when pressed, effectively avoid bolt loosening and reduce the risk of loosening caused by vibration, thereby improving the tightness of the connection; the flexible wave edge of the wave washer can adapt to uneven or slightly deviated contact surfaces, realize tighter sealing, and is especially suitable for occasions with high sealing requirements.

[0014] Preferably, the bottom of the motor shell is provided with an end cover, the end cover is fastened to the motor shell through end cover screws, the inside of the end cover is provided with a convex-shaped groove, the surface formed by the rear bearing and the wave washer matches the bottom of the convex-shaped groove, and the motor shaft matches the top of the convex-shaped groove.

[0015] Preferably, the motor shell and the end cover are provided with threaded through holes at the wave washer. The threaded through holes can clearly observe whether the wave washer is accurately installed, can improve the yield of the hollow cup motor, and can use the threaded through holes to fix the reinforcing ribs or other structural members in the subsequent process, enhance the connection strength of the motor shell and the end cover, and improve the stability and durability of the entire motor.

[0016] The utility model discloses the beneficial effect is: adopt the elastic washer sealing ring that increases in the front and rear of motor stator, can play the sealing effect in the process of stator filling, solve the problem of filling glue leakage, through the control of the inner diameter of motor stator is greater than the outer diameter of rotor and rear bearing, so that the rear bearing can be assembled on the rotor first, facilitate motor rotor's assembly, overhaul and rework, through the structure of the through -hole that opens at the wave washer, so that the wave washer can be visualized, so after the motor assembly is completed, can from the outside observation whether leak installs the wave washer. The structure that the inner diameter of stator is greater than the outer diameter of rotor and rear bearing, facilitate motor stator and rotor's assembly, overhaul and rework, improve the stability and pass rate of motor quality. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1It is the motor structure main view of the utility model.

[0018] Figure 2 It is the motor rotor section view of the utility model.

[0019] Figure 3 It is the motor stator section view of the utility model.

[0020] Figure 4 It is the wave washer observation port section view of the utility model.

[0021] In the figure: 1, motor shell, 2, clamp spring, 3, rotor assembly, 4, stator assembly, 5, wave washer, 6, end cover, 7, end cover screw, 8, front bearing, 9, motor shaft, 10, magnet, 11, protective sleeve, 12, balance ring, 13, rear bearing, 14, signal magnet, 15, elastic washer, 16, iron core, 17, winding skeleton, 18, glue-filled wire package, 19, UVW three-phase wire, 20, threaded through hole. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0023] A hollow cup motor includes a rotor assembly 3, a stator assembly 4 and a motor shell 1. The motor shell 1 is provided with a cavity penetrating along an axis. The rotor assembly 3 is arranged at the center of the cavity. The stator assembly 4 is installed in the motor shell 1 and tightly adheres to the motor shell 1 with a certain gap from the rotor assembly 3. The center of the rotor assembly 3 is a motor shaft 9, which is sleeved with a magnet 10 and provided with a bearing. The stator assembly 4 is a hollow cylinder. The main part is a glue-filled wire package 18 in the shape of an I-beam with thick ends and a thin middle. The periphery is provided with an annular iron core 16. The motor shell 1 is provided with a cavity penetrating along an axis. This design can reduce the weight of the motor and provide enough space to accommodate the rotor assembly 3 and the stator assembly 4, which is conducive to the heat dissipation and performance stability of the motor. The front bearing 8 is arranged on the front side of the step and limited by the clamp spring 2. The rear bearing 13 tightly adheres to the wave washer 5. These designs can improve the positioning accuracy and safety of the bearing, reduce the wear of the bearing and improve the assembly efficiency. Meanwhile, the noise and vibration can be reduced. The hollow cylinder design, in which the main part is a glue-filled wire package 18 in the shape of an I-beam with thick ends and a thin middle, can improve the mechanical strength of the stator, speed up the heat dissipation during the sealing process, reduce the overall temperature during the sealing, improve the quality of the motor stator sealing and be conducive to the performance stability of the motor stator.

[0024] The magnet 10 of the rotor assembly 3 is wrapped with a protective sleeve 11 and has a step limit on the left side. The high coercivity and high magnetic field strength of the magnet 10 help improve the dynamic performance and output torque of the motor. Due to the high corrosion resistance and oxidation resistance of the magnet 10, the maintenance requirements of the motor are reduced, and the long-term operating costs are reduced.

[0025] The front side of the motor shaft 9 step of the rotor assembly 3 is provided with a front bearing 8, and the rear side of the motor shaft 9 is provided with a rear bearing 13. The front bearing 8 and the rear bearing 13 jointly support the motor rotor, ensuring that it remains stable during operation, reducing vibration and noise; the bearing not only supports the rotor, but also is responsible for the positioning of the rotor, ensuring that the air gap size is uniform, which is crucial for the performance of the motor; by adding a wave washer 5 and pre-tightening force to the bearing chamber outer ring, the force causing axial movement can be offset, eliminating bearing noise, while ensuring that the bearing outer ring moves freely in the bearing chamber, avoiding the bearing clearance becoming smaller or disappearing due to thermal expansion of the rotor, thereby preventing the bearing temperature rise or seizure.

[0026] The bottom of the motor shaft 9 is provided with a signal magnet 14, which is a high-performance magnetic material that not only provides a stable magnetic field for the motor, but also interacts with sensors in the motor control system. The presence of the signal magnet 14 enables the motor to achieve high-precision positioning, which is crucial for applications that require precise control of speed and position. At the same time, it can provide feedback signals for the sensor, allowing the control system to monitor the motor's operating state in real time, thereby improving the motor's response speed and overall performance.

[0027] Between the magnet 10 and the rear bearing 13, a balance ring 12 is added. Magnets are widely used in high-performance motors due to their high magnetic energy product and temperature stability, but they can also cause certain electromagnetic interference. The introduction of the balance ring 12 effectively reduces this interference, as it can absorb and disperse electromagnetic waves generated during motor operation due to its conductive properties, thereby reducing the impact of electromagnetic interference on the motor and other electronic devices. This design not only improves the safety of the motor, ensuring stable operation in various environments, but also enhances the electromagnetic compatibility of the motor, allowing it to maintain high efficiency and reliable performance in complex electromagnetic environments.

[0028] In addition, the balance ring 12 also plays a certain role in heat dissipation, helping to disperse the heat generated during motor operation, thereby protecting sensitive components inside the motor and extending the service life of the motor. This design, which takes into account electromagnetic compatibility and thermal management, reflects the meticulousness and foresight of modern motor design, ensuring that the motor not only operates efficiently, but also maintains long-term stability and reliability.

[0029] The stator assembly 4 has a wire packing 18 inside the ring, a wire framework 17 around the ring, an elastic washer 15 between the ring-shaped core 16 and the wire packing 18, and a UVW three-phase line 19 at the bottom of the wire packing 18. The wire packing 18 of the stator assembly 4 is surrounded by a solid wire framework 17, providing additional mechanical support and protection. The elastic washer 15 is filled between the ring-shaped core 16 and the wire packing 18. This material has excellent insulation performance, excellent sealing characteristics and high and low temperature resistance, effectively improving the electrical safety and environmental adaptability of the motor. The filling of the elastic washer 15 also helps to reduce the impact of external shocks on sensitive components and provides good adhesion strength to ensure the structural stability of the stator assembly 4. In addition, the wire packing 18 is designed with a UVW three-phase line 19 at the bottom, which not only optimizes the electromagnetic performance of the motor, but also helps to improve the heat dissipation efficiency and production efficiency of the motor. The fast curing properties of UV glue make the production process more efficient, while its excellent chemical corrosion resistance and flame retardant properties further enhance the reliability and safety of the motor.

[0030] The front bearing 8 is located in front of the step and is limited by the snap spring 2, and the rear bearing 13 is in close contact with the wave washer 5. The snap spring 2 can prevent the bearing from moving axially, ensuring the correct position of the bearing on the shaft and increasing the safety and stability of the structure; the wave shape of the wave washer 5 can evenly distribute the load when under pressure, effectively preventing bolt loosening and reducing the risk of loosening caused by vibration, thereby improving the tightness of the connection; the flexible wave edge of the wave washer 5 can adapt to uneven or slightly deviated contact surfaces, achieving a tighter seal, especially suitable for occasions with high sealing requirements.

[0031] The bottom of the motor shell 1 is provided with an end cover 6, which is fastened to the motor shell 1 by end cover screws 7. The end cover 6 is a cylinder with a circuit board at the bottom, and the upper part of the end cover 6 is provided with a through hole and is equipped with UVW three-phase lines 19. The head of the motor shell 1 is provided with threads and corresponding steps, and a through hole is formed, with a circular sealing ring inside the through hole. The end cover 6 at the bottom of the motor shell 1 is tightly connected to the motor shell 1 by end cover screws 7, providing a stable support structure for the motor, ensuring stability and reliability during operation. The end cover 6 is designed in a cylindrical shape with a circuit board at the bottom. This layout not only protects the circuit board from environmental factors, improving the durability and safety of the motor, but also facilitates the arrangement and maintenance of the circuit. The upper part of the end cover 6 is provided with a through hole and is equipped with UVW three-phase lines 19, simplifying the wiring work of the motor and making the wiring more convenient and fast. The threads and corresponding steps at the head of the motor shell 1, as well as the circular sealing ring inside, not only provide good sealing performance to prevent liquid and dust from entering, protecting the internal components, but also enhance the application ability of the motor in humid or dusty environments. In addition, this design helps to improve the production efficiency of the motor, reduce costs, and enhance electromagnetic compatibility, making the overall appearance of the motor more neat and professional, while providing higher maintenance convenience and environmental adaptability.

[0032] In the design of a precision hollow cup motor, the connection between the motor shell 1 and the end cover 6 is a key link to ensure the performance of the motor. To achieve this goal, threaded holes are designed at the position of the wave washer 5. These threaded holes not only provide clear inspection points visually, allowing technicians to directly observe whether the wave washer 5 is correctly installed, thereby ensuring the sealing performance of the washer and the dustproof and waterproof performance of the motor, but also greatly improve the yield of the hollow cup motor.

[0033] In addition, the design of these threaded holes also takes into account the long-term stability and durability of the motor. During subsequent maintenance or upgrading of the motor, these holes can be used to fix reinforcing ribs or other structural components, such as additional support frames or heat sinks. In this way, not only does it enhance the connection strength between the motor shell 1 and the end cover 6, but it also improves the structural stability of the entire motor, allowing it to maintain high efficiency and reliability even when running for a long time or in harsh environments.

[0034] Overall, this design not only improves the assembly efficiency and quality control of the motor during the manufacturing process, but also provides additional stability and durability guarantees during the service life of the motor, allowing the hollow cup motor to perform well in various application scenarios.

[0035] The threaded holes in the wave washer 5 provide multiple advantages for the assembly and performance of the motor. First, this design allows for intuitive inspection of the wave washer 5 installation during assembly, ensuring its precise placement and improving the production yield of the hollow cup motor. The correct installation of the wave washer 5 is crucial for the stability and noise control of the motor, so being able to visually check this point is very helpful in ensuring product quality.

[0036] Furthermore, the presence of threaded holes also facilitates the subsequent installation of reinforcing ribs or other structural elements. Through these holes, reinforcing elements can be easily fixed in place, enhancing the connection strength between the motor housing 1 and the end cover 6. This enhanced connection not only improves the structural stability of the motor, but also significantly improves the durability and load-bearing capacity of the motor.

[0037] Overall, this design makes the motor more reliable during long-term operation by providing an intuitive inspection method and a convenient way to reinforce the structure, reducing the risk of failure due to improper installation or weak connections. This not only improves the performance of the motor, but also reduces maintenance costs and extends the service life of the motor, providing users with a more stable and durable power solution.

[0038] The utility model provides a kind of hollow cup motor of process friendly, and the hollow cup motor structure mainly includes motor housing 1, snap spring 2, rotor assembly 3, stator assembly 4, wave washer 5, end cover 6, end cover screw 7 etc. composition. Wherein rotor assembly 3 is by front bearing 8, motor shaft 9, magnet 10, protective sleeve 11, balance ring 12, rear bearing 13, signal magnet 14 composition, and the outer ring of front bearing 8 and rear bearing 13 all have double-layer O-ring. Wherein stator assembly 4 is by elastic washer 15, iron core 16, winding skeleton 17, glue filling wire package 18, UVW three-phase wire 19 composition.

[0039] The specific assembly sequence of the utility model is that stator 4 is first assembled into motor housing 1, then wave washer 5 is placed into end cover 6, and end cover 6 and motor housing 1 are fixed together with end cover screw 7, then rotor 3 is assembled into stator from the front end of motor housing 1, i.e. rear bearing 13 first enters into motor housing 1, then rear bearing 13 and wave washer 5 are pressed together according to preset bearing pre-tightening force, and finally snap spring 2 is assembled into the snap spring slot of motor housing 1. The pre-tightening force design of rear bearing 13 and wave washer 5 provides sufficient support and stability, reduces vibration and noise during motor operation, and prolongs the service life of the motor.

[0040] The utility model discloses hollow cup motor design adopts the structure that the inside diameter of stator is greater than the outside diameter of rotor and rear bearing, makes rear bearing 13 can be installed on motor shaft 9 before stator 4 and rotor 3 assemble, the assembly, overhaul and rework of motor stator and rotor are convenient, improve the stability and pass rate of motor quality.

[0041] The utility model discloses the threaded hole 20 is made to motor shell 1 and end cover 6, can observe whether missing wave gasket 5 through threaded hole 20 after motor production, and the stability and consistency of motor quality are preserved.

[0042] The utility model discloses the potting sealant, in the utility model, the injection process of potting sealant is the key step in motor stator manufacturing process, and it ensures the insulation performance and mechanical stability of motor stator.

[0043] The following is the detailed description of potting process: the injection of potting sealant is carried out in the potting tool during the potting process of the stator, and the potting tool mainly includes a potting bottom end cover, a potting top end cover and a potting core rod.

[0044] Then the potting bottom end cover, the potting top end cover and the stator without potting after winding are connected together by four screw rods, which not only fix the position of the stator, but also provide the necessary pressure for the injection of the potting sealant, ensuring that the potting sealant can be fully filled and solidified.

[0045] In summary, the design and implementation of this potting process not only improve the manufacturing quality of the motor stator, but also greatly improve the production efficiency.

[0046] The scope of protection of the present utility model is not limited to the specific embodiments described herein, but is determined by the accompanying claims and equivalents recognized by the Patent Law. This means that all technical solutions that are the same or equivalent in principle and spirit to the present utility model are within the scope of protection of the present utility model. Therefore, the innovation and practicality of the present utility model are not limited to the current forms displayed, but also include all possible, reasonable derivatives and extensions.

Claims

1. A hollow cup motor comprising a rotor assembly (3), a stator assembly (4) and a motor housing (1), characterized in that, The motor shell (1) is provided with a cavity penetrating along the axis, the rotor assembly (3) is arranged in the center of the cavity, and the stator assembly (4) is installed in the motor shell (1) and closely attached to the motor shell (1) with a certain gap from the rotor assembly (3); The rotor assembly (3) is provided with a magnet (10) sleeved on the motor shaft (9) and a bearing; The stator assembly (4) is a hollow cylinder, and the main part is a I-shaped glue filling wire package (18), and an annular iron core (16) is arranged on the periphery.

2. A hollow cup motor according to claim 1, characterized in that The magnet (10) of the rotor assembly (3) is wrapped with a protective sleeve (11), a step limiting portion is arranged on the left side of the motor shaft (9) and the magnet (10), and the outer diameter of the magnet (10) and the protective sleeve (11) is smaller than the inner diameter of the stator assembly (4).

3. A hollow cup motor according to claim 2, characterized in that The front side of the step of the motor shaft (9) of the rotor assembly (3) is provided with a front bearing (8), the rear side of the motor shaft (9) is provided with a rear bearing (13), the outer diameter of the rear bearing (13) is smaller than the inner diameter of the stator assembly (4), and the outer diameter of the front bearing (8) is larger than the inner diameter of the stator assembly (4).

4. A hollow cup machine according to claim 2 or 3, characterised in that, The bottom of the motor shaft (9) is provided with a cylindrical groove, a signal magnet (14) is arranged in the cylindrical groove, a balance ring (12) is arranged between the magnet (10) and the rear bearing (13), and the outer diameter of the balance ring (12) is much smaller than the rear bearing (13).

5. A hollow cup motor according to claim 1, characterized in that The stator assembly (4) is provided with a wire winding framework (17) inside the glue filling wire package (18), the annular iron core (16) and the glue filling wire package (18) are filled with an elastic washer (15) in the middle, and the bottom of the glue filling wire package (18) is a UVW three-phase wire (19).

6. A hollow cup motor according to claim 3, wherein The front bearing (8) is arranged on the front side of the step and provided with a snap spring (2) limiting portion, the snap spring (2) is arranged in the groove at the tail of the motor shell (1), and the rear bearing (13) is closely attached to the wave washer (5).

7. A hollow cup motor according to claim 3, wherein The bottom of the motor shell (1) is provided with an end cover (6) which is fastened to the motor shell through an end cover screw (7), the inside of the end cover (6) is provided with a convex-shaped groove, the surface formed by the rear bearing (13) and the wave washer (5) matches the bottom of the convex-shaped groove, and the motor shaft (9) matches the top of the convex-shaped groove.

8. A hollow cup machine according to claim 7, characterized in that The motor shell (1) and the end cover (6) are provided with a threaded through hole (25) at the wave washer (5).

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