Stator structure, rotor structure and electric machine

Abstract

The application relates to the technical field of motors, and particularly discloses a stator structure, a rotor structure and a motor. The stator structure comprises a base, stator poles and an excitation coil. The stator poles are uniformly distributed along the circumferential direction of the base. The excitation coil is sleeved on the stator poles. The upper end surface of the stator pole is a first inclined surface, which is adapted to the inclined bottom of the stirring kettle to reduce the physical air gap between the upper end surface of the stator pole and the rotor structure in the stirring kettle. In the above scheme, the upper end surface of the stator pole is designed as a first inclined surface to be adapted to the inclined bottom, which can reduce the physical air gap between the stator pole and the rotor structure in the stirring kettle, significantly reduce the magnetic resistance of the magnetic circuit, and further improve the utilization efficiency of the magnetic field energy. In the case of meeting the required electromagnetic force in the stirring working condition, the size of the stator structure and the rotor structure does not need to be increased to compensate for the electromagnetic force, the overall volume of the motor can be significantly reduced, and the motor can be designed to be small and efficient.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a stator structure, a rotor structure, and a motor. Background Technology

[0002] As the core driving component of stirred tanks, electric motors are widely used in chemical, biopharmaceutical, food processing, and new material preparation industries. Their performance directly determines the stirring efficiency, material mixing uniformity, and overall space utilization of the stirred tank. With the trend towards miniaturization, lightweighting, and high efficiency in industrial equipment, electric motors, with their advantages of non-contact suspension support, low friction loss, and high speed adaptability, are gradually replacing traditional mechanical bearing motors and becoming a core direction for industry upgrading.

[0003] Most existing motor stator structures adopt a conventional direct pole design, where the upper surface of the pole core is a horizontal plane, the stator is vertically arranged, and the rotor inside the mixing vessel is planar. This arrangement has two drawbacks: firstly, the motor occupies a large space, making it difficult to fit the installation requirements of miniaturized mixing vessels, limiting the utilization of the internal space and hindering compact design; secondly, the physical air gap between the pole core and rotor is large and prone to uneven distribution. Since the air gap is a major source of magnetic reluctance in the magnetic circuit, excessive or uneven air gaps directly lead to a surge in magnetic reluctance, a significant decrease in magnetic field utilization, and a significant reduction in electromagnetic force and stirring torque under the same excitation current, failing to meet the process requirements for efficient stirring. Summary of the Invention

[0004] This invention discloses a stator structure, a rotor structure, and a motor to solve or at least partially solve the aforementioned technical problems existing in related technologies.

[0005] To solve the above problems, the present invention adopts the following technical solution: In a first aspect, this application provides a stator structure for use in an electric motor, the stator structure comprising a base, stator poles, and excitation coils; wherein: The stator poles are evenly distributed along the circumferential direction of the base, and the excitation coil is sleeved on the stator poles; The upper end face of the stator pole is a first inclined surface, which is adapted to the inclined bottom of the stirred tank to reduce the physical air gap between the upper end face of the stator pole and the rotor structure inside the stirred tank.

[0006] Furthermore, the first inclined surface has the same inclination angle as the inclined bottom of the vessel.

[0007] Furthermore, the stator pole includes a first segment and a second segment, wherein the first segment is connected and fixed to the base, and the extension direction of the first segment is parallel to the axial direction of the stator structure, and the second segment extends obliquely relative to the first segment, with the first oblique surface formed on the end face of the second segment.

[0008] Furthermore, the included angle α between the first segment and the second segment is ≥120°.

[0009] Furthermore, it also includes a circuit board and a detection sensor, wherein the circuit board has an annular structure adapted to the plurality of stator poles, the detection sensor is electrically connected to the circuit board, and the detection sensor is used to detect the magnetic field position, magnetic field strength and polarity switching state of the rotor structure in the stirred tank.

[0010] Secondly, this application also provides a rotor structure for use in an electric motor, the rotor structure comprising rotor poles and permanent magnets; wherein: The rotor pole post is a ring-shaped component, and multiple permanent magnets are distributed along the circumference of the rotor pole post, with the polarities of adjacent permanent magnets alternating. The lower end face of the rotor pole is a second inclined surface to match the inclined bottom of the stirred tank, thereby reducing the physical air gap between the lower end face of the rotor pole and the outer stator structure of the stirred tank.

[0011] Furthermore, the inner and outer rings of the rotor pole post have a height difference in the axial direction, so that the lower end face of the rotor pole post forms the second inclined surface. The permanent magnet is disposed on the lower end face of the rotor pole post, and the shape of the permanent magnet is adapted to the shape of the rotor pole post.

[0012] Furthermore, the rotor structure also includes a support frame, which is connected to the rotor pole and / or permanent magnet. The support frame is provided with mounting holes for mounting the stirring paddle.

[0013] Thirdly, this application also provides an electric motor, which includes the aforementioned stator structure and rotor structure, wherein the stator structure is disposed outside the stirring vessel, and the rotor structure is disposed inside the stirring vessel, and the first inclined surface is opposite to the second inclined surface.

[0014] Furthermore, the first inclined surface is a plane, or the first inclined surface is an inclined arc surface adapted to the inclined bottom of the vessel, and the second inclined surface is an inclined arc surface adapted to the inclined bottom of the vessel.

[0015] The technical solution adopted in this invention can achieve the following beneficial effects: The stator structure, rotor structure, and motor of the present invention, by designing the upper end face of the stator pole as a first inclined surface to adapt to the inclined bottom of the vessel, can reduce the physical air gap between the stator pole and the rotor structure inside the stirring vessel, thereby significantly reducing the magnetic reluctance of the magnetic circuit and improving the utilization efficiency of magnetic field energy. While meeting the electromagnetic force required for stirring conditions, there is no need to compensate for the electromagnetic force by increasing the size of the stator and rotor structures, which can significantly reduce the overall volume of the motor and realize the miniaturization and high efficiency design of the motor. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the stator structure according to an embodiment of this application; Figure 2 This is a cross-sectional schematic diagram of the stator structure according to an embodiment of this application; Figure 3 This is a cross-sectional schematic diagram of the stator pole of an embodiment of this application; Figure 4 This is a schematic diagram of the rotor structure according to an embodiment of this application; Figure 5 This is a schematic diagram of the rotor pole of an embodiment of this application; Figure 6 This is a schematic diagram of the assembly of the motor and the stirring vessel according to an embodiment of this application; Figure 7 This is a cross-sectional schematic diagram of the motor according to an embodiment of this application; Figure 8 yes Figure 7 A magnified view of a portion of point A in the middle.

[0018] In the picture: 100. Stator structure; 110. Base; 120. Stator pole; 121. First section; 122. Second section; 1221. First inclined surface; 130. Excitation coil; 140. Circuit board; 150. Detection sensor; 160. Base core; 200. Rotor structure; 210. Rotor pole; 211. Second inclined surface; 220. Permanent magnet; 300. Stirring vessel; 310. Inclined vessel bottom. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0020] This application provides a motor, which is described below in conjunction with the accompanying drawings. Figures 1-8 The motor provided in this application will be described in detail through specific embodiments and application scenarios.

[0021] Please see Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 and Figure 8 This application discloses a stator structure 100, which can be applied to an electric motor. Specifically, it can be installed at the bottom of a mixing vessel 300. A rotor structure 200 is provided inside the mixing vessel 300. The stator structure 100 can drive the rotor structure 200 inside the mixing vessel 300 to rotate and stir the material inside the mixing vessel 300.

[0022] Specifically, the stator structure 100 in this embodiment includes a base 110, stator poles 120, and an excitation coil 130. The base 110 is the basic component of the stator structure 100, providing a stable support for the stator poles 120. Specifically, multiple stator poles 120 are evenly distributed along the circumferential direction of the base 110, with equal spacing between adjacent stator poles 120, ensuring that the magnetic field generated by the stator poles 120 is evenly distributed along the circumferential direction, providing a stable electromagnetic driving force for the rotor structure 200. The excitation coil 130 is sleeved on the stator poles 120. For example, the stator poles 120 are made of a magnetic core material, possessing good magnetic permeability, which can effectively concentrate the magnetic field generated by the excitation coil 130 and improve the magnetic field utilization rate. The base 110 can be made of either a non-magnetic material or a magnetic core material, thereby optimizing the magnetic circuit layout of the stator structure 100 and improving the magnetic field converging and transmission efficiency.

[0023] In this embodiment, the upper end face of the stator pole 120 is set as a first inclined surface 1221. The inclination angle and inclination direction of the first inclined surface 1221 are adapted to the inclined bottom 310 of the mixing vessel 300. In this way, the distance between the upper end face of the stator pole 120 and the inclined bottom 310 can be reduced, thereby reducing the physical air gap between the stator pole 120 and the rotor structure 200 inside the mixing vessel 300. This solves the technical defects of uneven physical air gap and excessive magnetic resistance in the traditional vertically set stator pole 120 under the inclined bottom 310, which significantly reduces the magnetic resistance of the magnetic circuit and improves the utilization efficiency of magnetic field energy. While meeting the electromagnetic force required for stirring, there is no need to compensate for the electromagnetic force by increasing the size of the stator structure 100 and the rotor structure 200. The overall volume of the motor can be significantly reduced, realizing the miniaturization and high efficiency design of the motor.

[0024] In this embodiment, since the rotor structure 200 needs to rotate in the stirred tank 300, the bottom structure of the stirred tank 300 is typically conical to accommodate the rotation of the rotor structure 200. Based on this, in this embodiment, the first inclined surface 1221 has the same inclination angle as the inclined bottom 310, ensuring that when the stator structure 100 is installed on the inclined bottom 310 of the stirred tank 300, the first inclined surface 1221 maintains a small distance from the outer wall of the inclined bottom 310. When the first inclined surface 1221 at the upper end of the stator pole 120 is opposite to the rotor structure 200 inside the stirred tank 300, the physical air gap between the stator pole 120 and the rotor structure 200 can be significantly reduced.

[0025] It should be noted that in the embodiments of this application, the first inclined surface 1221 can be a plane or an arc surface. In the preferred embodiment, the first inclined surface 1221 can be an arc surface adapted to the inclined bottom 310. When the rotor structure 200 is adapted to the inner wall of the inclined bottom 310, the first inclined surface 1221 and the lower end face of the rotor structure 200 can be kept parallel and opposite, so that the physical air gap between the stator structure 100 and the rotor structure 200 is completely uniform.

[0026] In the embodiments of this application, please refer to Figure 2 and Figure 3The stator pole 120 includes a first segment 121 and a second segment 122. Exemplarily, the first segment 121 and the second segment 122 are integrally formed. The first segment 121 is connected and fixed to the base 110. Exemplarily, the first segment 121 can be connected and fixed to the base 110 by means of adhesive bonding, welding, or bolt fastening. The extending direction of the first segment 121 is parallel to the axial direction of the stator structure 100. As the basic support segment of the stator pole 120, its vertical extension design ensures the verticality of the stator pole 120 installation. It can also provide a stable magnetic path for magnetic field transmission, ensuring that the magnetic field is efficiently transmitted along the axis to the second segment 122. The second segment 122 extends at an angle relative to the first segment 121, and its angle of inclination is adapted to the angled bottom 310 of the stirred vessel 300. The first inclined surface 1221 is formed on the top end face of the second segment 122, and the first inclined surface 1221 can be perpendicular to the extension direction of the second segment 122. This design can maximize the effective magnetic field area of ​​the stator pole 120 and avoid magnetic field scattering caused by improper end face inclination angle.

[0027] In a further technical solution, the included angle α between the first segment 121 and the second segment 122 is ≥120°. In a preferred embodiment, the included angle α is in the range of 120°≤α≤165°. This angle is limited to ensure that the first inclined surface 1221 of the second segment 122 can be fully adapted to the conical inclined bottom 310 of the stirring vessel 300 and achieve parallel and opposite to the rotor structure 200. This effectively avoids the situation where the first inclined surface 1221 cannot fully fit the outer wall of the inclined bottom 310 due to the tilt angle being too small. In this case, it is difficult to fully reduce the physical air gap between the stator structure 100 and the rotor structure 200, which would lead to an increase in magnetic circuit reluctance and magnetic field loss. It also avoids the defect that the effective magnetic conduction area is excessively reduced due to the tilt angle of the second segment 122 being too large, which would prevent the magnetic field generated by the excitation coil 130 from being efficiently conducted to the stator and rotor structure 200 through the stator pole 120, resulting in a significant reduction in magnetic field conduction efficiency and insufficient motor drive performance.

[0028] In this embodiment, the stator structure may further include a circuit board 140 and a detection sensor 150. The circuit board 140 has an annular structure adapted to the plurality of stator poles 120, and its size can be adapted to the inner circumferential space enclosed by the plurality of stator poles 120. For example, the circuit board 140 can be supported on the excitation coil 130 by an isolation pad. For example, the isolation pad can be made of polytetrafluoroethylene to isolate the magnetic field and block heat transfer. The plurality of detection sensors 150 are electrically connected to the circuit board 140 and are distributed along the circumference of the circuit board 140. For example, the detection sensor 150 can be a Hall sensor. The detection sensor 150 is used to detect the magnetic field position, magnetic field strength and polarity switching state of the rotor structure 200 in the stirring vessel 300.

[0029] In this embodiment of the application, the stator structure also includes a base core 160, which is fixedly disposed inside the base 110. The lower ends of multiple stator poles 120 are inserted through and fixed inside the base core 160. For example, the base core 160 can be made of laminated silicon steel sheets. The base core 160 can serve as a common magnetic conductive substrate on the stator side, so that each stator pole 120 forms a connected and continuous closed magnetic circuit.

[0030] Please see Figure 4 , Figure 5 , Figure 6 This application also discloses a rotor structure 200, which can be applied to an electric motor and can be installed inside a mixing vessel 300. A stator structure 100 is provided outside the mixing vessel 300, and the rotor structure 200 can be driven by the stator structure 100 to rotate, thereby stirring the material inside the mixing vessel 300.

[0031] In the embodiments of this application, please refer to Figure 4 and Figure 5 The rotor structure 200 includes a rotor pole post 210 and a permanent magnet 220. The rotor pole post 210 is an annular component, and the lower end face of the rotor pole post 210 forms a second inclined surface 211 to adapt to the inclined bottom 310 of the mixing vessel 300. For example, the second inclined surface 211 is a conical structure adapted to the inclined bottom 310, which can adapt to the rotation of the rotor structure 200 in the mixing vessel 300. The second inclined surface 211 of the rotor pole post 210 can also provide a stable mounting carrier and a good magnetic conduction path for the permanent magnet 220. Multiple permanent magnets 220 are evenly and equally spaced along the circumference of the rotor pole post 210, and the polarities of adjacent permanent magnets 220 are alternately arranged (i.e., N pole and S pole are arranged in a cyclical manner), so that a uniform and continuous magnetic field is formed in the circumference of the rotor pole post 210, ensuring that each permanent magnet 220 can generate a stable magnetic field coupling with the stator pole post 120 during the rotation of the rotor structure 200.

[0032] In the embodiments of this application, please refer to Figure 4 , Figure 7 and Figure 8The rotor pole post 210 can be a structure of uniform thickness, with its overall thickness remaining consistent along the circumference. This ensures both the structural rigidity and magnetic uniformity of the rotor pole post 210, preventing magnetic field conduction deviations caused by uneven thickness, and also reduces the processing difficulty of the rotor pole post 210. The inner and outer rings of the rotor pole post 210 have a preset height difference in the axial direction. Through the design of this height difference, the lower end face of the rotor pole post 210 naturally forms a second inclined surface 211 that matches the inclined bottom of the vessel 310. The permanent magnet 220 is attached to the second inclined surface 211, and its shape matches the annular contour of the rotor pole post 210. Specifically, it adopts an arc-shaped sheet structure. Multiple arc-shaped sheet permanent magnets 220 are arranged closely along the circumferential direction of the rotor pole post 210 and connected end to end to form an annular whole that perfectly matches the second inclined surface 211. The bottom surface of this annular whole matches the inclined bottom of the stirring vessel 300 and remains parallel to the second inclined surface 211 of the rotor pole post 210, ensuring that the permanent magnet 220 can spatially match the rotor pole post 210 and the inclined bottom of the vessel 310.

[0033] It is understandable that setting the permanent magnet 220 as an arc-shaped sheet-like annular structure that matches the shape of the lower end face of the rotor pole post 210 can maximize the relative effective area of ​​the permanent magnet 220 and the first inclined surface 1221, ensuring that the two achieve maximum magnetic field coupling in the inclined space, further improving the transmission efficiency and utilization rate of magnetic field energy, and reducing magnetic circuit reluctance and leakage magnetic loss.

[0034] In this embodiment, the rotor structure 200 may further include a bracket, which is firmly connected to the rotor pole post 210 and / or the permanent magnet 220, providing stable support and fixation for the rotor pole post 210 and the permanent magnet 220, and effectively protecting the rotor pole post 210 and / or the permanent magnet 220 from external interference. For example, the permanent magnet 220 may be fixedly connected to the rotor pole post 210 by adhesive bonding and is embedded and covered inside the bracket. This installation method can not only effectively prevent the permanent magnet 220 from shifting or falling off during high-speed rotation, but also reduce the wear and interference of external factors on the permanent magnet 220, further improving the stability and service life of the rotor structure.

[0035] In a further technical solution, the bracket is provided with a mounting hole. For example, the mounting hole can be located at the center of the bracket. The mounting hole is used to install the stirring paddle, ensuring that the stirring paddle can be stably assembled and rotate synchronously with the rotor, so as to achieve uniform stirring of the material in the mixing vessel 300.

[0036] This application also discloses an electric motor, specifically a stirring motor; please refer to [link / reference needed]. Figure 2 , Figure 4 , Figure 5 , Figure 7 and Figure 8The disclosed motor includes the aforementioned stator structure 100 and rotor structure 200. The stator structure 100 is located outside the stirring vessel 300, and the rotor structure 200 is located inside the stirring vessel 300. The first inclined surface 1221 of the stator structure 100 is opposite to the second inclined surface 211 of the rotor structure 200. The two are precisely adapted to the structural features of the conical inclined bottom 310 of the stirring vessel 300, so that the physical air gap between the stator pole 120 and the rotor pole 210 is always kept uniform and minimized. Compared with the air gap unevenness and magnetic reluctance soaring caused by the mismatch between the stator structure 100 and the rotor structure due to axial orientation and inclined bottom 310 in traditional motors, this solution can significantly reduce the total magnetic reluctance of the magnetic circuit, allowing the magnetic field generated by the excitation coil 130 to be efficiently coupled with the magnetic field of the permanent magnet 220, significantly improving the magnetic field energy utilization efficiency. Stable electromagnetic driving force can be output without increasing the excitation power or the overall size of the motor, which is conducive to the miniaturization and high efficiency development of motors.

[0037] In this embodiment, the first inclined surface 1221 is a plane, or the first inclined surface 1221 is an inclined arc surface adapted to the inclined vessel bottom 310, and the second inclined surface 211 is an inclined arc surface adapted to the inclined vessel bottom 310. Preferably, both the first inclined surface 1221 and the second inclined surface 211 are inclined arc surfaces. This preferred design allows the first inclined surface 1221 and the second inclined surface 211 to form a triple precise fit with the conical inclined vessel bottom 310. Compared with the combination of plane and arc surface, the material between the stator structure 100 and the rotor structure 200 can be further reduced. The air gap is optimized and its circumferential distribution is made uniform. At the same time, the effective area of ​​magnetic field coupling between stator pole 120 and rotor pole 210 is greatly increased, which effectively reduces the scattering and leakage magnetic loss of magnetic field during the transmission of magnetic field in the air gap. This significantly improves the utilization efficiency of magnetic field energy in the magnetic circuit, enabling the excitation magnetic field generated by excitation coil 130 and the permanent magnet magnetic field of permanent magnet 220 to achieve more efficient coupling. Without increasing the excitation power or the amount of permanent magnet, it provides stronger electromagnetic driving force for rotor structure 200, thereby improving the driving efficiency and operating stability of the entire motor.

[0038] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0039] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A stator structure applied to an electric machine, characterized by, The stator structure (100) includes a base (110), a stator pole (120), and an excitation coil (130); wherein: The stator poles (120) are evenly distributed along the circumferential direction of the base (110), and the excitation coil (130) is sleeved on the stator poles (120). The upper end face of the stator pole (120) is a first inclined surface (1221) to be adapted to the inclined bottom (310) of the stirred tank (300) to reduce the physical air gap between the upper end face of the stator pole (120) and the rotor structure (200) in the stirred tank (300).

2. The stator structure of claim 1, wherein The first inclined surface (1221) has the same inclination angle as the inclined bottom of the vessel (310).

3. The stator structure of claim 1, wherein The stator pole (120) includes a first segment (121) and a second segment (122), wherein the first segment (121) is connected and fixed to the base (110), and the extension direction of the first segment (121) is parallel to the axial direction of the stator structure (100), the second segment (122) extends obliquely relative to the first segment (121), and the first oblique surface (1221) is formed on the end face of the second segment (122).

4. The stator structure of claim 3, wherein The included angle α between the first segment (121) and the second segment (122) is ≥120°.

5. The stator structure of claim 3, wherein It also includes a circuit board (140) and a detection sensor (150), wherein the circuit board (140) has an annular structure adapted to the plurality of stator poles (120), and the detection sensor (150) is electrically connected to the circuit board (140). The detection sensor (150) is used to detect the magnetic field position, magnetic field strength and polarity switching state of the rotor structure (200) in the stirred tank (300).

6. A rotor structure for use in an electric machine, characterized by It includes rotor pole posts (210) and permanent magnets (220); wherein: The rotor pole post (210) is a ring-shaped component, and a plurality of permanent magnets (220) are distributed circumferentially along the rotor pole post (210), and the polarities of two adjacent permanent magnets (220) are alternately arranged. The lower end face of the rotor pole (210) is a second inclined surface (211) to be adapted to the inclined bottom (310) of the stirred tank (300) to reduce the physical air gap between the lower end face of the rotor pole (210) and the outer stator structure (100) of the stirred tank (300).

7. The rotor structure of claim 6, wherein The inner and outer rings of the rotor pole post (210) have a height difference in the axial direction, so that the lower end face of the rotor pole post (210) forms the second inclined surface (211). The permanent magnet (220) is disposed on the lower end face of the rotor pole post (210), and the shape of the permanent magnet (220) is adapted to the shape of the rotor pole post (210).

8. The rotor structure according to claim 6, characterized in that, It also includes a bracket connected to the rotor pole (210) and / or permanent magnet (220), and the bracket is provided with mounting holes for mounting the stirring paddle.

9. An electric machine characterized by Includes a stator structure (100) as described in any one of claims 1 to 5 and a rotor structure (200) as described in any one of claims 6 to 8, wherein the stator structure (100) is disposed outside the stirred tank (300) and the rotor structure (200) is disposed inside the stirred tank (300), and the first inclined surface (1221) is opposite to the second inclined surface (211).

10. The electric machine of claim 9, wherein, The first inclined surface (1221) is a plane, or the first inclined surface (1221) is an inclined arc surface adapted to the inclined bottom of the vessel (310), and the second inclined surface (211) is an inclined arc surface adapted to the inclined bottom of the vessel (310).

Images