Stator design method for integrated general fluid machine and general fluid module

Abstract

The present application belongs to the technical field of stator manufacturing, and particularly relates to a stator design method for integrated general fluid machinery and a general fluid module. The stator design method for integrated general fluid machinery comprises the following steps: 1) determination of an electric drive diameter; 2) determination of an effective electric drive length; and 3) determination of a pole pitch. Through the above operation process, the operation efficiency and stability of the general fluid module applying the stator can be effectively ensured or even improved. Another object of the present application is to provide a general fluid module applying the stator design method, so that through integrated design, the intermediate connecting frame and the number of vulnerable components and friction loss are reduced, thereby further improving the overall efficiency of the unit.

Description

Technical Field

[0001] This invention belongs to the field of stator manufacturing technology, specifically relating to a stator design method and a general fluid module for integrated general fluid machinery. Background Technology

[0002] General-purpose fluid machinery refers to machinery that uses fluids (liquids or gases) as working media for energy conversion. Based on the form of energy conversion, it can be divided into prime movers (water turbines, steam turbines, etc.) and driven machines (pumps, compressors, etc.). The former converts the energy of the fluid into mechanical energy; the latter converts mechanical energy into the energy of the fluid, pressurizing the fluid and achieving industrial purposes such as transportation. It is characterized by its wide variety and large quantity, and is widely distributed in fields such as petrochemicals, steel metallurgy, flood control and drainage municipal engineering, shipbuilding, and military engineering. Its safe and reliable operation is closely related to people's lives. Generally speaking, the structure of general-purpose fluid machinery consists of a motor, intermediate connecting frames (brackets, bearing housings, etc.), and fluid machinery functional components (volute and blades for pumps, screw / vortex blades and housing for compressors, and blades and volute for water turbines). Due to interdisciplinary influence, the motor, intermediate connecting frames, and fluid machinery functional components are manufactured and installed separately, and then finally connected together. That is to say, the motor belongs to the field of electrical engineering and is manufactured and processed separately; the fluid machinery functional components belong to the field of fluid machinery and are also manufactured and processed separately. To connect the motor to the functional components of fluid machinery and enable them to perform their functions, an intermediate connecting frame is required. This increases the overall size of the general-purpose fluid machinery and raises carbon emissions during manufacturing. Furthermore, the presence of the connecting frame increases friction losses in components such as bearings and seals, leading to increased energy consumption during operation. It also increases the number of vulnerable parts, significantly reducing the service life of the general-purpose fluid machinery. Particularly in the field of hydraulic machinery, the limited lifespan of mechanical seals necessitates annual maintenance, increasing maintenance costs throughout the operation. Summary of the Invention

[0003] One objective of this invention is to provide a stator design method for integrated general-purpose fluid machinery, thereby effectively ensuring or even improving the operating efficiency and stability of general-purpose fluid modules using this stator. Another objective of this invention is to provide a general-purpose fluid module applying the aforementioned stator design method, thereby further improving the overall efficiency of the unit through integrated design, reducing intermediate connecting frames, the number of vulnerable parts, and friction losses.

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

[0005] A stator design method for integrated general-purpose fluid machinery, characterized by comprising the following steps:

[0006] 1) Electric drive diameter Da Determination:

[0007] Electric drive diameter D a Determined according to the following formula:

[0008] D a =int(D′) a )+1

[0009] in:

[0010] A′ is the estimated electrical load; B′ δ The estimated value of air gap magnetic density; n N Rated speed; α i To calculate the polar arc coefficient, λ represents the ratio of the polar arc width to the polar distance; λ is the estimated aspect ratio; power P N For the rated power of the general fluid module, U N and I N Rated voltage and rated current;

[0011] 2) Effective electric drive length L a Determination:

[0012] L a =int(L′ a )+1

[0013] in:

[0014] L′ a =λD a ;

[0015] 3) Determination of polar moment τ:

[0016]

[0017] In the formula, p is the series logarithm.

[0018] Preferably, the value of λ ranges from 0.6 to 1.5.

[0019] Preferably, the general fluid module using the stator design method for integrated general fluid machinery is characterized in that: the general fluid module includes a stator and a rotor coaxially sleeved outside the stator, with blades or gear teeth integrally fixed on the outer wall of the rotor; winding slots are provided on the stator for installing electric drive windings; on the cross-section of the stator, an auxiliary slot is recessed on the outer wall of the stator between two adjacent sets of winding slots, and the auxiliary slot is arranged through the stator along the axial direction; the ratio of the depth of the auxiliary slot to the width of the auxiliary slot is in the range of 0.65 to 1.5; the ratio of the depth of the auxiliary slot to the depth of the winding slot is in the range of 0.15 to 0.25.

[0020] Preferably, the number of auxiliary slots is 1 to 6.

[0021] Preferably, the auxiliary groove has a rectangular, triangular, semi-circular, or trapezoidal shape.

[0022] Preferably, the winding slot type is a plow-shaped slot, a rectangular slot, a semi-plow-shaped slot, or a sloping shoulder round bottom slot.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. The stator designed using the above scheme effectively meets actual working requirements and ensures or even improves the operating efficiency and stability of general-purpose fluid modules using this stator. Based on the above design, adding the auxiliary slots that meet the specific requirements further reduces the error between the motor's electromagnetic torque and the design requirements. Furthermore, from the perspective of motor operational stability, the motor with added auxiliary slots exhibits relatively smaller fluctuations in electromagnetic torque and runs more smoothly, demonstrating significant effectiveness.

[0025] 2. The integrated structure formed by the rotor and stator allows both the stator and rotor to be submerged within the fluid medium. This fluid medium effectively absorbs most of the vibration and noise, significantly reducing the overall vibration and noise of the unit. Furthermore, the integrated design of the rotor and stator eliminates the need for separate selection of the motor and fluid machinery, improving the compatibility between the electromechanical and fluid machinery components and enhancing the overall unit efficiency. This invention allows for a high degree of integration between the motor and fluid machinery functional components, with the load resting directly on the rotor, eliminating the need for additional intermediate connecting frames and reducing carbon emissions. The reduction of intermediate connecting frames also means the elimination of supporting bearings, seals, etc., resulting in lower friction losses, lower energy consumption, a more compact and rational structure, and further improved overall unit efficiency. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention;

[0027] Figure 2 This is a partial cross-sectional view of the stator structure of the present invention;

[0028] Figure 3 The simulation comparison diagram shows the stator with and without auxiliary slots.

[0029] The actual correspondence between the reference numerals and component names in this invention is as follows:

[0030] 10-Stator 11-Winding slot 12-Electric drive winding 13-Auxiliary slot

[0031] 20-Rotor 21-Blade Detailed Implementation

[0032] For ease of understanding, an axial flow pump will be used as an example here, combined with... Figures 1-3 The specific structure and operation of the present invention are further described below:

[0033] The specific structure of the present invention is as follows: Figure 1 As shown, its structure mainly includes an external rotor 20 and a stator 10 located inside the rotor 20; blades 21 are mounted on the rotor 20, and corresponding guide vanes and flow deflectors are arranged at both ends of the flow channel, ultimately forming one embodiment of the general fluid module of the present invention. Figure 1 As can be seen, since the blade 21 and the rotor 20 are integrated into a single structure, when the rotor 20 rotates, the fluid continuously enters the rotor 20 and the stator 10 and flows out through the gaps between the mating parts. This can greatly remove the heat generated by the rotor 20 and the stator 10 during operation, thereby improving the actual lifespan of the axial flow pump. Furthermore, by optimizing and modifying the stator 10 in conjunction with the stator design method described in this invention, the operating efficiency and stability of the axial flow pump can be further ensured and even improved.

[0034] More specifically, a stator design method for integrated general-purpose fluid machinery is characterized by the following steps:

[0035] 1) Electric drive diameter D a Determination:

[0036] Electric drive diameter D a Determined according to the following formula:

[0037] D a =int(D′) a )+1

[0038] in:

[0039] A′ is the estimated electrical load; B′ δ The estimated value of air gap magnetic density; n N Rated speed; α i To calculate the polar arc coefficient, we use the ratio of the polar arc width to the polar distance.

[0040] λ is the estimated length-to-diameter ratio, ranging from 0.6 to 1.5. In actual operation, it is related to the mechanical time constant. The smaller the mechanical time constant, the larger the value is, and one significant figure is retained.

[0041] power P N For the rated power of the general fluid module, U N and I N Rated voltage and rated current;

[0042] 2) Effective electric drive length L a Determination:

[0043] L a =int(L′ a )+1

[0044] in:

[0045] L′ a =λD a ;

[0046] 3) Determination of polar moment τ:

[0047]

[0048] In the formula, p is the series logarithm.

[0049] 4) Auxiliary slot design:

[0050] The auxiliary slot 13 not only reduces the cogging torque of the permanent magnet motor, but also effectively suppresses electromagnetic torque fluctuations. Its main geometric structure is as follows: Figure 2 As shown. In actual design, auxiliary slots 13 can be set between the winding slots 11 of the stator 10, and the winding slots 11 are used to install the electric drive windings 12. The number of auxiliary slots 13 is 1 to 6, and their geometric structure can be rectangular, triangular, semi-circular, trapezoidal, etc. The depth of the auxiliary slot 13 is h. c With auxiliary slot 13, slot width b c The ratio is 0.65 to 1.5; the depth of auxiliary tank 13 is h. c Satisfy h c / h r =0.15~0.25, where h r The depth of winding slot 11 is specified. Of course, the slot shape of winding slot 11 can be plow-shaped slot, rectangular slot, semi-plow-shaped slot, sloping shoulder round bottom slot, etc.

[0051] Example 1

[0052] Following the design method described above, the parameters of a motor were obtained, as follows:

[0053] The motor is designed to have a power of 850W and an effective electric drive diameter D. a 45mm; Effective electric drive length L a Equal to 1.5D a That is, 68mm; 4 2p magnetic poles; 6 auxiliary slots; where h r The winding slot depth is 30mm, and the auxiliary slot depth is h. c Satisfy h c / h r =0.2, auxiliary groove depth h c The depth of the auxiliary groove is 6mm; c With auxiliary slot width b c The ratio hc / b c =1.2, auxiliary slot width b c It is 5mm.

[0054] To verify the accuracy of the above analytical model and the effectiveness of the present invention, the designed motor was subjected to finite element analysis and simulation, resulting in... Figure 3 The figures shown are simulation results comparing the results with and without the auxiliary slot.

[0055] in conclusion:

[0056] from Figure 3 As can be seen, the electromagnetic torque of the motor with the auxiliary slot is 5.45 Nm, approximately 856.02 W; while the electromagnetic torque of the motor without the auxiliary slot is 5.52 Nm, approximately 867.02 W. From these data, we can conclude that the stator design of this application ensures that the designed motor structure, i.e., the general fluid module, meets the design requirements regardless of whether the auxiliary slot is added. Of course, the electromagnetic torque of the motor with the auxiliary slot has a smaller error compared to the design requirement (850 W). Furthermore, in terms of motor operational stability, the electromagnetic torque fluctuation of the motor with the auxiliary slot is relatively smaller, resulting in more stable motor operation.

[0057] Of course, those skilled in the art will recognize that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0059] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A stator design method for integrated general-purpose fluid machinery, characterized in that... Includes the following steps: 1) Electric drive diameter D a Determination: Electric drive diameter D a Determined according to the following formula: D a =int(D′ a )+1 in: A′ is the estimated electrical load; B′ δ The estimated value of air gap magnetic density; n N Rated speed; α i To calculate the polar arc coefficient, λ represents the ratio of the polar arc width to the polar distance; λ is the estimated aspect ratio; power P N For the rated power of the general-purpose fluid module, U N and I N Rated voltage and rated current; 2) Effective electric drive length L a Determination: L a =you(L′ a )+1 in: L′ a =λD a ; 3) Determination of polar moment τ: In the formula, p is the series logarithm.

2. The stator design method for integrated general-purpose fluid machinery according to claim 1, characterized in that: The value of λ ranges from 0.6 to 1.

5.

3. A universal fluid module employing the stator design method for integrated universal fluid machinery as described in claim 1 or 2, characterized in that: The general fluid module includes a stator (10) and a rotor (20) coaxially sleeved outside the stator (10). The outer wall of the rotor (20) is integrally fixed with blades (21) or gear teeth. The stator (10) has winding slots (11) for installing electric drive windings (12). On the cross-section of the stator (10), an auxiliary slot (13) is recessed on the outer wall of the stator between two adjacent sets of winding slots (11), and the auxiliary slot (13) is arranged through the stator (10) axially. The ratio of the depth of the auxiliary slot (13) to the width of the auxiliary slot (13) is in the range of 0.65 to 1.

5. The ratio of the depth of the auxiliary slot (13) to the depth of the winding slot (11) is in the range of 0.15 to 0.

25.

4. The universal fluid module for the stator design method of integrated universal fluid machinery according to claim 3, characterized in that: The number of auxiliary slots (13) is 1 to 6.

5. The universal fluid module for the stator design method of integrated universal fluid machinery according to claim 3, characterized in that: The auxiliary groove (13) has a rectangular, triangular, semi-circular, or trapezoidal shape.

6. The universal fluid module for the stator design method of integrated universal fluid machinery according to claim 3, characterized in that: The winding slot (11) is a plow-shaped slot, a rectangular slot, a semi-plow-shaped slot, or a sloping shoulder round bottom slot.

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