Introduction of 3D Simulation Analysis Process of ANSYS10.0 Software in Loosely Coupled Transformer

Today's transformer field has developed into a very mature stage. Lightweight, high efficiency and high density are the development goals of today's transformers. In the development of transformer products, the finite element simulation software can be used to easily change the structural parameters of the transformer and observe the influence of these parameters on the transformer. ANSYS is the world's famous large-scale general finite element analysis software. It is also the most widely used and widely used finite element analysis software in China. It integrates structural, thermal, fluid, electromagnetic, acoustic and other professional analysis and can be widely used in machinery. Manufacturing, petrochemical, light industry, shipbuilding, aerospace, automotive transportation, electronics, civil engineering, water conservancy, railway and other industrial construction and scientific research.

introduction

As a controllable eccentric of the core component of the rotary guided intelligent drilling system, the principle is to use the motor pump to generate the power to push the rib telescopic. When the motor pump power is used, the energy of the motor pump is derived from the downhole turbine generator. Since the mechanical structure of the controllable eccentric determines that the motor pump is to be mounted on a non-rotating sleeve and the generator is to be mounted on a rotating spindle, this involves energy transfer problems between rotation and non-rotation. The contact slip ring energy transmission method has been used in the past. Due to the inconvenience of the installation of the slip ring, the wear and tear during rotation, the vulnerability to the drilling fluid, the corrosion of the water and the mud, there is an urgent need for a new type. Non-contact energy transmission mode - loosely coupled power transmission technology. As a core part of the loosely coupled power transmission technology - loosely coupled transformers, its research is particularly important.

For the limitations of downhole harsh environment and space, we have great difficulties in the study of loosely coupled transformers, and ANSYS's solid modeling capability can quickly and accurately simulate three-dimensional loosely coupled transformers. ANSYS 3D simulation has its own unique advantages in modeling, meshing and post-processing, especially in post-processing, it can observe the electromagnetic force, magnetic induction and magnetomotive force in all directions. The following is a three-dimensional simulation analysis process of ANSYS10.0 software in a loosely coupled transformer.

ANSYS 3D Simulation of Loosely Coupled Transformer

For the loosely coupled transformer, we used the magnetic vector bit method for simulation. The Magnetic Vector Bit Method (MVP) is one of two node-based analysis methods supported by ANSYS for 3D static, harmonic and transient analysis. The vector bit method has magnetic vector bits AX, AY, AZ in the X, Y, and Z directions, respectively. Three additional degrees of freedom are also introduced in the load or circuit coupling analysis: current (CURR), voltage drop (EMF) and voltage (VOLT). In the 3-D vector-bit equation, the INFIN111 far-field elements (AX, AY, AZ three degrees of freedom) are used to model the infinite boundary.

Cell type selection, real constants and material property settings

Field coupling can be used for 2D and 3D simulation. The circuit unit needs to be modeled with CIRCUI24 unit, and the established circuit model is coupled with the finite element solid model. The solid model can be selected from PLAN53 (2D), SOLID97 (3D) and SOLIDll7 (3D-20node) units. For the 3-D analysis of the nodal method, the optional unit is the 3D vector bit SOLID97 unit. Unlike the 2D unit, the degrees of freedom are: AX, AY, AZ, AX, AY, AZ, CUR, EMF; coil real constant setting and material The property settings are as shown in Table 1, Table 2.

Table 1: Coil real constants

Table 2: Material Properties

Solid modeling

The loosely coupled transformer material is Mn-Zn ferrite, and the structure is a top and bottom can magnetic ring. According to the actual size of the magnetic ring, a three-dimensional model can be established. The Emag module of ANSYS10.0 is used to simulate the three-dimensional field coupling of the transformer. The physical model of the transformer is shown in Figure 1. The analysis process is as follows:

Figure 1 Transformer physical map

According to the physical model of the transformer shown in Figure 1, the model is modeled by the command flow or GUI method. The three-dimensional model is shown in Figure 2.

Figure 2 ANSYS 3D model

Then meshing, you can also use GUI and command stream operations. There are many ways to divide meshes. Here, three-dimensional free meshing is mainly used.

Building a circuit model

Establish an independent voltage source with the voltage set to a sinusoidal voltage source. And set the amplitude, frequency, phase and other parameters of the voltage source.

Establish a circuit model of the twisted coil, and set parameters such as the actual constant and the unit type.

The circuit model is set for the internal resistance of the coil, and the size of the resistor is measured by a multimeter.

The secondary coil is loaded with load R3 to work. The complete model is built as shown in Figure 3.

Transient analysis

Coupling the CURR degrees of freedom of all nodes of the twisted coil, applying boundary conditions.

If the applied voltage is 15V, the frequency is 10kHz, the magnetic ring has an air gap of 1mm, the load is 100Ω, and 16 load steps are used in one sinusoidal period, the time interval of each load step is 6.25e-6s. Each load step is further divided into 5 substeps. Solve after applying 20 load steps in this paper.

Background processing, result observation

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