CN112052533A - Energy-saving evaluation mode of small and medium-sized three-phase asynchronous motor based on numerical simulation - Google Patents
Energy-saving evaluation mode of small and medium-sized three-phase asynchronous motor based on numerical simulation Download PDFInfo
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- CN112052533A CN112052533A CN202010635290.2A CN202010635290A CN112052533A CN 112052533 A CN112052533 A CN 112052533A CN 202010635290 A CN202010635290 A CN 202010635290A CN 112052533 A CN112052533 A CN 112052533A
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- 238000011156 evaluation Methods 0.000 title claims abstract description 20
- 238000004088 simulation Methods 0.000 title claims abstract description 19
- 238000004364 calculation method Methods 0.000 claims abstract description 13
- 239000012530 fluid Substances 0.000 claims description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 239000007787 solid Substances 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000013077 scoring method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The invention discloses a small and medium-sized three-phase asynchronous motor energy-saving evaluation mode based on numerical simulation, which comprises the following steps of 1) establishing a physical model; 2) grid division; 3) setting a boundary condition; 4) selecting a calculation method; 5) and (5) analyzing a simulation result. The invention belongs to the technical field of motor energy-saving evaluation, and particularly provides a numerical simulation-based energy-saving evaluation mode for a small and medium-sized three-phase asynchronous motor, which is simple, feasible and fine in evaluation and can be used for scoring and evaluating the overall energy efficiency level of the three-phase asynchronous motor in actual operation.
Description
Technical Field
The invention belongs to the technical field of motor energy-saving evaluation, and particularly relates to a small and medium-sized three-phase asynchronous motor energy-saving evaluation mode based on numerical simulation.
Background
The motor can be used for various equipment such as a dragging fan, a pump, a compressor and the like, and is widely applied to various fields such as industry, commerce, agriculture, public facilities, household electric appliances and the like. The motor system comprises a motor, a dragged device, a transmission control system and a pipe network load, and the electricity consumption accounts for about two thirds of the total electricity consumption of the society. The improvement of the energy efficiency level of the motor system has important significance for building a resource-saving and environment-friendly society and promoting sustainable development.
At present, the energy utilization rate of a motor system in China is about 10 to 30 percent lower than the international advanced level, the operation efficiency is 10 to 20 percent lower than the foreign advanced level, and the energy-saving potential is huge. The loss of the motor mainly comprises stator copper loss, rotor copper loss, iron loss, mechanical loss, stray loss and the like, and the energy efficiency level of a motor system can be improved by adopting a high-efficiency motor or improving a process flow and an adjusting method, operating under the optimal parameters, and adjusting a system structure and an equipment combination mode. For example, the energy saving of the system can reach 2% -8% when a high-efficiency motor is adopted, the energy saving can reach 10% -50% when the speed-regulating driving motor is adopted for operation, the energy saving can reach 2% -10% when a high-efficiency mechanical transmission/speed reducer is adopted, and the energy saving can reach 1% -5% when the motor system is maintained by adopting the modes of lubrication, correction, adjustment and the like.
In summary, the existing national standards, patents and research documents already stipulate and study part of energy efficiency indexes and limits of the motor system, for example, energy efficiency limit values and energy efficiency grades GB18613-2012 of small and medium-sized three-phase asynchronous motors stipulate energy-saving evaluation values and energy efficiency limit values of three-phase asynchronous motors, but a comprehensive three-phase asynchronous motor energy efficiency scoring method is not proposed, and it is impossible to score and evaluate the overall energy efficiency level of a three-phase asynchronous motor in actual operation, and it is also impossible to finely evaluate the energy efficiency level of the motor system.
Disclosure of Invention
In order to solve the existing problems, the invention provides a small and medium-sized three-phase asynchronous motor energy-saving evaluation mode which is simple, feasible and fine in evaluation and based on numerical simulation, and is used for scoring and evaluating the overall energy efficiency level of a three-phase asynchronous motor in actual operation.
The technical scheme adopted by the invention is as follows: the invention relates to a small and medium-sized three-phase asynchronous motor energy-saving evaluation mode based on numerical simulation, which comprises the following steps:
1) establishing a physical model: basic assumption and simplification are carried out on a medium-small three-phase asynchronous motor to be evaluated, a three-dimensional model is established according to geometric parameters of the medium-small three-phase asynchronous motor to be evaluated, various losses generated when the medium-small three-phase asynchronous motor runs in a rated state are loaded on corresponding parts respectively, and a fluid domain of a physical model is divided into a fluid domain around a rotating part and a fluid domain around a static part according to the requirement of a multiple rotating coordinate system method;
2) grid division: adopting a Mesh module in a Workbench to perform Mesh division on a solution domain of a physical model, creating boundary layer meshes in a fluid region, performing local Mesh encryption on meshes with poor quality, and performing Mesh quality detection in the Mesh module after the Mesh division is completed, wherein the detection result shows that the quality of the meshes is basically above 0.45, the Mesh gradient is basically below 0.75, the Mesh quality of general engineering problems is guaranteed to be above 0.3, and the gradient is guaranteed to be below 0.9;
3) setting boundary conditions: setting an inlet as a pressure inlet boundary condition, setting a relative pressure as 0, setting an outlet as a pressure outlet boundary condition, setting the relative pressure as 0, setting the outer surface of a small and medium-sized three-phase asynchronous motor as a third boundary condition, setting a fluid-solid interface and a solid-solid interface as thermal coupling boundary conditions, setting a fluid domain at the outlet side as an adiabatic boundary in the axial direction, namely setting the heat flow q as 0, wherein the interface of a rotating fluid domain and a static fluid domain adopts an inter boundary, the interface of the fluid and the solid adopts a non-slip solid-wall boundary condition, and the outer surface of the small and medium;
4) selecting a calculation method: initializing data, selecting a simulated monitor, calculating by adopting a standard k-turbulence model, processing a near-wall surface region by adopting a standard wall function, finally selecting iteration times, starting iterative calculation, and stopping calculation after calculation convergence;
5) and (3) simulation result analysis: and calculating the efficiency of the medium and small three-phase asynchronous motor according to the simulation result, and performing energy-saving evaluation on the medium and small three-phase asynchronous motor according to the efficiency of the medium and small three-phase asynchronous motor.
Further, the various losses generated in step 1) include iron loss, copper loss, stray loss and mechanical loss, 70% of the iron loss is loaded on the stator core, 30% of the iron loss is loaded on the rotor core, 50% of the stray loss is loaded on the stator core, and the other 50% of the stray loss is loaded on the rotor core.
Further, the efficiency of the small and medium-sized three-phase asynchronous motor in the step 5) is calculated according to the formula A:
η ═ 1- Σ P/(P + Σp) ] × 100% of the formula a
Where P is the active power and Σ P is the total loss.
The invention with the structure has the following beneficial effects: according to the scheme, the physical model is established for the medium and small three-phase asynchronous motor to be evaluated based on the numerical simulation energy-saving evaluation mode of the medium and small three-phase asynchronous motor, so that the working parameters of the medium and small three-phase asynchronous motor can be simply and quickly obtained, the result is visual, and the medium and small three-phase asynchronous motor can be accurately evaluated in energy conservation.
Detailed Description
The technical solutions of the present invention will be described in further detail with reference to specific embodiments, and all the technical features and operation principles of the present invention that are not described in detail are the prior art.
The invention relates to a small and medium-sized three-phase asynchronous motor energy-saving evaluation mode based on numerical simulation, which comprises the following steps:
1) establishing a physical model: basic assumption and simplification are carried out on a medium-small three-phase asynchronous motor to be evaluated, a three-dimensional model is established according to geometric parameters of the medium-small three-phase asynchronous motor to be evaluated, various losses generated when the medium-small three-phase asynchronous motor runs in a rated state are loaded on corresponding parts respectively, and a fluid domain of a physical model is divided into a fluid domain around a rotating part and a fluid domain around a static part according to the requirement of a multiple rotating coordinate system method;
2) grid division: adopting a Mesh module in a Workbench to perform Mesh division on a solution domain of a physical model, creating boundary layer meshes in a fluid region, performing local Mesh encryption on meshes with poor quality, and performing Mesh quality detection in the Mesh module after the Mesh division is completed, wherein the detection result shows that the quality of the meshes is basically above 0.45, the Mesh gradient is basically below 0.75, the Mesh quality of general engineering problems is guaranteed to be above 0.3, and the gradient is guaranteed to be below 0.9;
3) setting boundary conditions: setting an inlet as a pressure inlet boundary condition, setting a relative pressure as 0, setting an outlet as a pressure outlet boundary condition, setting the relative pressure as 0, setting the outer surface of a small and medium-sized three-phase asynchronous motor as a third boundary condition, setting a fluid-solid interface and a solid-solid interface as thermal coupling boundary conditions, setting a fluid domain at the outlet side as an adiabatic boundary in the axial direction, namely setting the heat flow q as 0, wherein the interface of a rotating fluid domain and a static fluid domain adopts an inter boundary, the interface of the fluid and the solid adopts a non-slip solid-wall boundary condition, and the outer surface of the small and medium;
4) selecting a calculation method: initializing data, selecting a simulated monitor, calculating by adopting a standard k-turbulence model, processing a near-wall surface region by adopting a standard wall function, finally selecting iteration times, starting iterative calculation, and stopping calculation after calculation convergence;
5) and (3) simulation result analysis: and calculating the efficiency of the medium and small three-phase asynchronous motor according to the simulation result, and performing energy-saving evaluation on the medium and small three-phase asynchronous motor according to the efficiency of the medium and small three-phase asynchronous motor.
The invention and its embodiments have been described above, without this being limitative. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A small and medium-sized three-phase asynchronous motor energy-saving evaluation mode based on numerical simulation is characterized by comprising the following steps:
1) establishing a physical model: basic assumption and simplification are carried out on a medium-small three-phase asynchronous motor to be evaluated, a three-dimensional model is established according to geometric parameters of the medium-small three-phase asynchronous motor to be evaluated, various losses generated when the medium-small three-phase asynchronous motor runs in a rated state are loaded on corresponding parts respectively, and a fluid domain of a physical model is divided into a fluid domain around a rotating part and a fluid domain around a static part according to the requirement of a multiple rotating coordinate system method;
2) grid division: adopting a Mesh module in a Workbench to perform Mesh division on a solution domain of a physical model, creating boundary layer meshes in a fluid region, performing local Mesh encryption on meshes with poor quality, and performing Mesh quality detection in the Mesh module after the Mesh division is completed, wherein the detection result shows that the quality of the meshes is basically above 0.45, the Mesh gradient is basically below 0.75, the Mesh quality of general engineering problems is guaranteed to be above 0.3, and the gradient is guaranteed to be below 0.9;
3) setting boundary conditions: setting an inlet as a pressure inlet boundary condition, setting a relative pressure as 0, setting an outlet as a pressure outlet boundary condition, setting the relative pressure as 0, setting the outer surface of a small and medium-sized three-phase asynchronous motor as a third boundary condition, setting a fluid-solid interface and a solid-solid interface as thermal coupling boundary conditions, setting a fluid domain at the outlet side as an adiabatic boundary in the axial direction, namely setting the heat flow q as 0, wherein the interface of a rotating fluid domain and a static fluid domain adopts an inter boundary, the interface of the fluid and the solid adopts a non-slip solid-wall boundary condition, and the outer surface of the small and medium;
4) selecting a calculation method: initializing data, selecting a simulated monitor, calculating by adopting a standard k-turbulence model, processing a near-wall area by adopting a standard wall function, finally selecting iteration times, starting iterative calculation, and stopping calculation after calculation convergence;
5) and (3) simulation result analysis: and calculating the efficiency of the medium and small three-phase asynchronous motor according to the simulation result, and performing energy-saving evaluation on the medium and small three-phase asynchronous motor according to the efficiency of the medium and small three-phase asynchronous motor.
2. The energy-saving evaluation mode of the small and medium-sized three-phase asynchronous motor based on the numerical simulation as claimed in claim 1, wherein the various types of losses generated in step 1) include iron loss, copper loss, stray loss and mechanical loss, 70% of the iron loss is loaded on the stator core, 30% of the iron loss is loaded on the rotor core, 50% of the stray loss is loaded on the stator core, and the other 50% of the stray loss is loaded on the rotor core.
3. The energy-saving evaluation mode of the small and medium-sized three-phase asynchronous motor based on numerical simulation as claimed in claim 1, characterized in that the efficiency of the small and medium-sized three-phase asynchronous motor in step 5) is calculated according to formula a:
η ═ 1- Σ P/(P + Σp) ] × 100% of the formula a
Where P is the active power and Σ P is the total loss.
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| CN202010635290.2A CN112052533A (en) | 2020-07-03 | 2020-07-03 | Energy-saving evaluation mode of small and medium-sized three-phase asynchronous motor based on numerical simulation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112560313A (en) * | 2020-12-18 | 2021-03-26 | 南京维拓科技股份有限公司 | Intelligent design recommendation method and system oriented to high-tech electronic product simulation drive |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112560313A (en) * | 2020-12-18 | 2021-03-26 | 南京维拓科技股份有限公司 | Intelligent design recommendation method and system oriented to high-tech electronic product simulation drive |
| CN112560313B (en) * | 2020-12-18 | 2021-11-09 | 南京维拓科技股份有限公司 | Intelligent design recommendation method and system oriented to high-tech electronic product simulation drive |
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Application publication date: 20201208 |