Iron core and motor used in hydrofoil surfboard power sleeve
By optimizing the stator teeth and rotor structure and adjusting the copper-iron loss ratio, the problems of low efficiency and high temperature in electric hydrofoil surfboard motors were solved, resulting in improved motor performance and enhanced user experience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN HOBBYWING TECH CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-06-30
AI Technical Summary
Existing electric hydrofoil surfboard motors have low stator and rotor core fill factor and unreasonable slot design, resulting in low motor efficiency, high temperature, large cogging torque, low range, poor NVH performance, and high production costs.
Design a core and motor for a hydrofoil surfboard power sleeve. By arranging the stator teeth in a circumferentially close arrangement to form the rotor mounting center area, optimizing the stator and rotor structure, adjusting the copper-iron loss ratio, optimizing the cogging torque and back electromotive force, and reducing noise and torque pulsation.
It improves motor efficiency, reduces temperature rise and cogging torque, extends driving range, improves NVH performance, and reduces production costs.
Smart Images
Figure CN224438603U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of motors, and in particular to an iron core and motor used in the power sleeve of a hydrofoil surfboard. Background Technology
[0002] With the rapid development of the global water sports market, electric hydrofoil surfboards have become one of the fastest-growing segments in the industry due to their adaptability to waveless environments and environmental advantages. However, the efficiency and range of their power systems remain key bottlenecks restricting user experience. Currently, mainstream electric hydrofoil surfboard motors generally suffer from high core losses and insufficient heat dissipation, making it difficult to improve overall system efficiency. The design of the stator and rotor cores has the greatest impact on motor efficiency; existing products have low slot fill factor and unreasonable slot design, resulting in low system efficiency under rated operating conditions.
[0003] It is understandable that existing stator and rotor core motors have low efficiency, high winding temperature rise, and large cogging torque, resulting in low overall range, limited power, poor NVH and overall operability, and high production costs. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an iron core and motor for use in the power sleeve of a hydrofoil surfboard.
[0005] The objective of this utility model is achieved through the following technical solution:
[0006] A core for a hydrofoil surfboard power sleeve includes: a stator core and a rotor assembly.
[0007] The stator core includes a stator yoke and multiple stator teeth. A central mounting cavity is provided on the stator yoke. Each stator tooth is installed in the central mounting cavity of the stator yoke, and the stator teeth are arranged in a circumferential row and closely together to form a rotor mounting center area.
[0008] The rotor assembly is housed within the rotor mounting center area. The rotor assembly includes a rotor core and multiple bread magnets. Multiple magnetic slots are provided on the rotor core, and each bread magnet is embedded in one of the magnetic slots.
[0009] In one embodiment, the rotor mounting center area is circular, and the outer surfaces of each of the bread magnets are connected to form a circle, which is concentric with the rotor mounting center area of the stator core.
[0010] In one embodiment, the stator core includes 18 stator teeth and 18 coil slots, the openings of the coil slots facing the rotor core, and the stator yoke and each stator tooth of the stator core are integrally formed.
[0011] In one embodiment, the bread magnet has an arc-shaped surface on one side near the stator teeth and a flat surface on one side near the rotor core.
[0012] In one embodiment, the outer diameter of the stator yoke is the stator outer diameter D1, and the stator teeth together form the rotor mounting center area, which is the stator inner diameter D2. The stator outer diameter D1 and the stator inner diameter D2 satisfy: 63 <D1<64,0.7<D1 / D2<0.72。
[0013] In one embodiment, the tooth width of the stator teeth is W1, and the width of the stator yoke is W2, which satisfies: 0.82 <W1 / W2<0.84。
[0014] In one embodiment, the included angle of the stator core teeth is A1, where A1 satisfies: 159° <A1<163°;
[0015] The width of the stator tooth shoe is W3, and the width of the bread magnet is W4, which satisfies: 1.28 <W3 / W4<1.33。
[0016] In one embodiment, the thickness of the bread magnet is T1, where T1 satisfies: 3.1 <T1<3.6;
[0017] The outer diameter of the rotor core is D3, and D3 satisfies: 41 <D3<42。
[0018] In one embodiment, the ends of the stator teeth and the inside of the coil slots are coated with insulating glue, and a coil is wound on the stator teeth, with the number of turns on three consecutive stator teeth being 4 turns, 3 turns, and 4 turns, respectively.
[0019] This utility model also provides an electric motor, including the iron core as described above.
[0020] The advantages and beneficial effects of this utility model compared to the prior art are as follows:
[0021] This invention relates to a core and motor for a hydrofoil surfboard power sleeve. By arranging the stator teeth in a tightly packed, circumferential pattern to form the rotor mounting center area, and connecting the outer surfaces of the magnetized components to form a circle, along with optimizing the overall core structure, the copper-to-iron loss ratio of the motor can be effectively increased. By adjusting the ratio of copper and iron losses, the motor efficiency within the operating range is effectively improved. Simultaneously, considering NVH (noise, vibration, and harshness) and the overall user experience, the cogging torque is optimized. By reducing the cogging torque, motor noise and torque pulsation are effectively reduced. Attached Figure Description
[0022] Figure 1 This is a structural diagram of the iron core used in the power sleeve of a hydrofoil surfboard according to one embodiment of the present invention;
[0023] Figure 2 for Figure 1 The diagram shows the structure of the stator core.
[0024] Figure 3 for Figure 1 The diagram shows the structure of the rotor assembly.
[0025] Figure 4 for Figure 1 The diagram shows the structure of the bread magnet.
[0026] Figure 5 This is a structural diagram of a motor according to one embodiment of the present invention. Detailed Implementation
[0027] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.
[0028] This application addresses the shortcomings of existing product technologies by redesigning the stator and rotor cores and magnets, thereby effectively improving motor efficiency and reducing temperature rise, and significantly enhancing the user experience.
[0029] Please see Figures 1-5 A core for a hydrofoil power kit includes a stator core 100 and a rotor assembly 200. It should be noted that the stator core is an internal rotor structure, so the rotor assembly is set inside the stator core. The rotor core of the rotor assembly is a surface-mount structure, which can be fixed by applying insulating glue inside the rotor core, thereby improving structural stability.
[0030] The stator core 100 includes a stator yoke 110 and multiple stator teeth 120. A central mounting cavity is formed on the stator yoke 110, and each stator tooth is installed within this central mounting cavity. The stator teeth 120 are arranged in a circumferential, tightly packed arrangement, forming a rotor mounting center area 130. It should be noted that the stator yoke 110 connects and fixes the stator teeth 120, while also providing mechanical strength and stability to the entire stator structure. During motor operation, it effectively transmits and disperses magnetic field forces, reduces local stress concentration, prevents structural deformation caused by mechanical vibration or magnetic field effects, and ensures long-term reliable operation of the motor. The design of the central mounting cavity is based on the distribution law of the motor's electromagnetic field and the optimization requirements of the mechanical structure. By rationally planning the cavity size and shape, the stator teeth 120 can form an optimal magnetic field loop after installation, improving the electromagnetic conversion efficiency of the motor. Meanwhile, this structure also facilitates motor heat dissipation, as the central mounting cavity provides space for the flow of cooling medium, accelerating heat dissipation and reducing motor temperature rise. The stator teeth 120 are key components for the generation and conduction of the motor's magnetic field. When the stator windings are energized, the stator teeth 120 generate a magnetic field under the influence of the current, which interacts with the magnetic field of the rotor assembly 200, thereby generating electromagnetic torque and driving the rotor to rotate. Furthermore, the close arrangement of the stator teeth 120 effectively suppresses magnetic field leakage, improves the motor's magnetic field utilization rate, and enhances the motor's output power and efficiency.
[0031] The rotor mounting center area 130 is used to mount the rotor assembly, and the rotor mounting center area 130 is circular. In this embodiment, the outer surfaces of each of the bread magnets are connected to form a circle, which is concentric with the rotor mounting center area of the stator core. The design of the tightly arranged circular arrangement is based on the symmetry and uniformity requirements of the motor's electromagnetic field. By setting the number, size, and spacing of the stator teeth 120, the magnetic field generated by the stator core 100 can be uniformly distributed within the rotor mounting center area 130, reducing magnetic field distortion and harmonic interference, and improving the smoothness and accuracy of motor operation. At the same time, this design also helps to reduce motor noise and vibration, and improve the overall performance of the motor. In addition, the circular structure of the rotor mounting center area 130 can also ensure that the air gap between the rotor assembly 200 and the stator core 100 is uniform, reducing the change in air gap magnetic resistance and improving the electromagnetic performance and efficiency of the motor. The circular structure can make the magnetic and mechanical forces experienced by the rotor assembly 200 during rotation uniformly distributed, reducing vibration and noise caused by structural asymmetry, thereby improving NVH performance. In addition, a uniform air gap can ensure stable magnetic field conduction, improving the motor's output torque and power factor.
[0032] The rotor assembly 200 is accommodated in the rotor installation central area. The rotor assembly 200 includes a rotor core 210 and multiple bread magnets 220. Multiple magnet slots are provided on the rotor core, and each of the bread magnets is correspondingly embedded in one of the magnet slots. It should be noted that a magnetic field conduction path can be provided for the bread magnets, enabling the magnetic field generated by the bread magnets to effectively interact with the magnetic field of the stator core 100, thereby generating an electromagnetic torque to drive the rotation of the rotor.
[0033] In this embodiment, please refer to Figure 2 , the stator core includes 18 stator teeth and 18 coil slots. The openings of the coil slots face the rotor core, and the stator yoke portion and each stator tooth of the stator core are of an integrally formed structure, and the stator core is integrally stamped by a mold. The outer diameter of the stator yoke portion is the stator outer diameter D1, and the rotor installation central area jointly formed by each stator tooth is the stator inner diameter D2. The stator outer diameter D1 and the stator inner diameter D2 satisfy: 63 < D1 < 64, 0.7 < D1 / D2 < 0.72. Preferably, the stator outer diameter D1 is 63.4 or 63.7; D1 / D2 is 0.71 or 0.715. Thus, by redesigning the electromagnetic scheme, the motor efficiency in the full frequency band is improved, the motor temperature rise is effectively reduced, the cogging torque and torque ripple are reduced at the same time, the endurance of the whole machine is effectively improved, the output power is increased, the NVH of the whole machine is improved, the user comfort and operability are enhanced, and the production cost is reduced.
[0034] It should be noted that one surface of the bread magnet close to the stator tooth is an arc surface, and one surface close to the rotor core is a flat surface. The flat surface of the bread magnet is attached in the magnet slot.
[0035] Please refer to Figures 2-4 , the tooth width of the stator tooth is W1, and the width of the stator yoke portion is W2, which satisfies: 0.82 < W1 / W2 < 0.84. The tooth boot angle of the stator core is A1, and A1 satisfies: 159° < A1 < 163°; the tooth boot width of the stator tooth is W3, and the width of the bread magnet is W4, which satisfies: 1.28 < W3 / W4 < 1.33. Thus, by optimizing the dimensions and parameters of the stator tooth and the stator yoke portion, the proportion of copper and iron losses in the motor can be effectively adjusted. By adjusting the reasonable ratio of copper loss and iron loss, the motor efficiency in the working range is effectively improved. At the same time, considering the NVH and the experience of the whole machine operation, the cogging torque is optimized. By reducing the cogging torque, the motor noise and torque ripple are effectively reduced. At the same time, by optimizing the back electromotive force, the harmonic content of the back electromotive force is effectively reduced, the harmonic loss is reduced, and the drive compatibility is improved.
[0036] In this embodiment, the thickness of the bread magnet is T1, and T1 satisfies: 3.1 < T1 < 3.6; the outer diameter of the rotor core is D3, and D3 satisfies: 41 < D3 < 42.
[0037] In this embodiment, an insulating glue is coated on the end of the stator tooth and in the coil slot, and a coil is wound around the stator tooth. The number of turns on three consecutive stator teeth is 4 turns, 3 turns, and 4 turns respectively. The insulating glue can play a role in fixing, and can also reduce vibration and noise, and improve the mute performance.
[0038] Please refer to Figure 5 , the present utility model also provides a motor, including the iron core as described above.
[0039] Compared with the prior art, this solution can effectively reduce the cogging torque, lower the motor resistance, achieve efficiency improvement, and at the same time, the temperature rise at the rated point can be reduced by more than 10 °C. Thus, by redesigning the electromagnetic solution, the motor efficiency in the full frequency band is improved, the motor temperature rise is effectively reduced, while the cogging torque and torque ripple are reduced, the endurance of the whole machine is effectively improved, the output power is increased, the NVH of the whole machine is improved, the user comfort and operability are enhanced, and the production cost is reduced.
[0040] The above-described embodiments only represent several embodiments of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.
Claims
1. A core for use in the power sleeve of a hydrofoil surfboard, characterized in that, include: The stator core includes a stator yoke and multiple stator teeth. A central mounting cavity is provided on the stator yoke. Each stator tooth is installed in the central mounting cavity of the stator yoke, and the stator teeth are arranged in a circumferential row and closely together to form a rotor mounting center area. The rotor assembly is housed within the rotor mounting center area. The rotor assembly includes a rotor core and multiple bread magnets. Multiple magnetic slots are provided on the rotor core, and each bread magnet is embedded in one of the magnetic slots.
2. The iron core for the power sleeve of a hydrofoil surfboard according to claim 1, characterized in that, The rotor mounting center area is circular, and the outer surfaces of each of the bread magnets are connected to form a circle, which is concentric with the rotor mounting center area of the stator core.
3. The iron core for the power sleeve of a hydrofoil surfboard according to claim 2, characterized in that, The stator core includes 18 stator teeth and 18 coil slots, the openings of the coil slots facing the rotor core, and the stator yoke and each stator tooth of the stator core are integrally formed.
4. The iron core for the power sleeve of a hydrofoil surfboard according to any one of claims 1 to 3, characterized in that, The bread magnet has an arc-shaped surface on one side near the stator teeth and a flat surface on one side near the rotor core.
5. The iron core for the power sleeve of a hydrofoil surfboard according to claim 4, characterized in that, The outer diameter of the stator yoke is the stator outer diameter D1, and the stator teeth together form the rotor mounting center area, which is the stator inner diameter D2. The stator outer diameter D1 and the stator inner diameter D2 satisfy: 63 <D1<64,0.7<D1 / D2<0.72。 6. The iron core for the power sleeve of a hydrofoil surfboard according to claim 5, characterized in that, The stator tooth width is W1, and the stator yoke width is W2, which satisfy: 0.82 <W1 / W2<0.84。 7. The iron core for the power sleeve of a hydrofoil surfboard according to claim 6, characterized in that, The included angle of the stator core teeth is A1, and A1 satisfies: 159° <A1<163°; The width of the stator tooth shoe is W3, and the width of the bread magnet is W4, which satisfies: 1.28 <W3 / W4<1.33。 8. The iron core for the power sleeve of a hydrofoil surfboard according to claim 7, characterized in that, The thickness of the bread magnet is T1, and T1 satisfies: 3.1 <T1<3.6; The outer diameter of the rotor core is D3, and D3 satisfies: 41 <D3<42。 9. The iron core for the power sleeve of a hydrofoil surfboard according to claim 8, characterized in that, The ends of the stator teeth and the inside of the coil slots are coated with insulating glue, and coils are wound on the stator teeth. The number of turns on three consecutive stator teeth are 4 turns, 3 turns, and 4 turns, respectively.
10. An electric motor, characterized in that, Includes the iron core as described in any one of claims 1 to 9.