## Electromagnetic Simulation |

EMS is a magnetic and electric field modeling and simulation software. It is a versatile electromagnetic design tool as it calculates the magnetic and electric field and flux, electric potential, voltage, current, magnetic force, electric force, torque, eddy current and losses, resistance, inductance, capacitance, skin effect, proximity effect, and electromagnetic induction. The applications include transformers, motion industries, electric motor, eddy current, sensors, NDT, NDE, electrical machines, insulator, high voltage, magnets, biomedical, and induction heating. It offers the state-of-the-art accuracy and power of the finite element method and meshing technology. Whether your preferred CAD is SOLIDWORKS®, Autodesk® Inventor®, or SpaceClaim, EMS is your indispensable electromagnetic companion. In addition, EMS is Gold Certified by SOLIDWORKS® Corporation. EMS solves the basic Maxwell’s equations directly. Consequently, it can readily be used as a transformer design software, an electric motor design software, a parasitic RLC extractor, a NDT simulation software, a high voltage and high-power simulation software, and more. This versatility is further explained below.

EMS can be used as a transformer design software. EMS can be used to virtually study critical transformer design parameters, including:

A transformer shall not store any energy but rather transfer instantaneously from input to output. Unfortunately, in real life transformers do store some undesired energy. EMS computes the leakage inductance which represents the stored energy between windings regions occupied by non-magnetic media. Similarly, EMS calculates the mutual inductance which indicates the amount of undesired stored energy in the magnetic core and small air gaps.

EMS can calculate the maximum “hot spot” temperature rise at the core surface inside the windings center. This calculation is helpful in determining the smallest core size that meets the required power supply efficiency without exceeding the maximum “hot spot” temperature. To calculate the said temperature rise, EMS takes into consideration all transformer losses including, eddy loss, hysteresis loss, core loss, winding loss, and heat loss as well as the surrounding liquid temperature and convection properties.

EMS calculates the magnetic flux density and saturation levels in the core which can help in selecting the proper core material, shape, and size for any frequency and desired power output. The transformer’s designer ultimately aims at choosing a shape easy to manufacture, as small of a core size as possible, and the least expensive core material while respecting the required power without saturating the core.

Open and short circuit tests of a transformer are critical but costly and time consuming. EMS enables the designer to virtually run these tests accurately and efficiently.

EMS calculates the dielectric breakdown which is instrumental in selecting the proper bushings, surge arrestors and other insulating infrastructure. This type of calculation helps the designer meet the various insulation coordination standards.

EMS calculates the magnetic force acting both on the windings and the core material as well as the stress and structural displacement due to these forces. This type of calculations is helpful in guaranteeing the structural integrity of the transformer.

EMS can be used as a motor design software and can be used to virtually study critical electric motor design parameters, including:

Winding inductance and resistance play significant role in control and state estimation of electrical motors. The example of this would be phase current control in a SRM motor or rotor position estimation in a sensor-less BLDC. EMS can determine these parameter values for a desired set of frequency and current conditions.

EMS is full 3D modeling platform. This enables simulation of some important topologies and effects which are otherwise impossible to analyze:

-Skewing of slots or rotor poles is a common technique for cogging force reduction. Its results can be estimated only if interaction between stator and rotor is captured in all 3 dimensions.

-Advanced machine topologies such as axial flux and transverse flux machines inherently operate with 3D flux distribution and should be treated as such.

-End windings have a significant effect on the winding resistance, as well as its leakage inductance.

EMS can compute transient and steady state torque profiles for various electrical machine topologies such as Permanent magnet AC machine, BLDC, Switched Reluctance, Induction etc. Torque results for different rotor RPMs and winding currents determine the optimal operating conditions. Furthermore, EMS helps minimize the cogging torque by comparing its magnitude for different air gap lengths or fractional slot pitches.

Successful machine design depends on accurate representation of nonlinear phenomenon in the core material such as flux saturation, eddy current and hysteresis losses. EMS comes with a library of predefined solid and laminated core materials. Designer can easily compare different materials in terms of the saturation, core losses and overall efficiency. Core and winding loss results can be coupled with EMS's thermal solver and determine temperature rise and cooling requirements.

Machine radius, length and number of poles will greatly determine its torque and power rating. However, finer geometrical features of the magnetic circuit have profound effect on the machine performance. For example, shape of squirrel cage bars in an Induction motor will affect how torque changes with the rotor slip. All these parameters can be readily varied inside EMS to evaluate their effect on the performance of the motor.

EMS can be used as a parasitic RLC extractor. That is, it accurately calculates the resistance, the inductance, and the capacitance for any arbitrary 3D electric and electronics structure. These calculations take into consideration the proximity effect, the skin effect, the dielectric and ohmic loss, and the frequency dependence. In other words, both DC and AC parasitic RLC are calculated. These parasitic values are instrumental in modeling various electric and electronics devices and circuits, including:

RLC models for high-speed electronic devices such as ICs, PCBs, packages, and on-chip passive components are crucial in studying crosstalk and distortion, interconnect delays and ringing, and ground bounce.

RLC models are useful in simulating power electronic equipment such as bus bars, cables, inverters and converters commonly found in power distribution applications, and hybrid and electric vehicles.

The modeling of touchscreens found in today’s smart phones and computers heavily depends on the accurate calculation of the capacitance of the screen wires.

Electromagnetic fields and waves are widely used in the nondestructive testing technologies. Because EMS accurately calculates the magnetic flux and eddy current, it covers a wide varies of electromagnetic NDT techniques including: eddy-current testing (ECT), magnetic flux leakage (MFL), remote field testing (RFT), magnetic particle inspection (MPI), pulses eddy current (PEC), and the alternating current field measurement (ACFM). NDT screening commonly involves the movement of the NDT probes. EMS is well-suited to model this type of motion since EMS couples to Solidworks Motion.

EMS seamless integration in the three main CAD platforms empowers you to simulate the most intricate electrical machine, motor, generator, sensor, transformer, high voltage apparatus, high power machine, electrical switch, valve, actuator, PCB, levitation machine, loud speaker, permanent magnet machine, NDT equipment, inverter, converter, bus bar, inductor, bushings, or biomedical equipment. You don't need to "reinvent the wheel", just acquire a CAD model from the mechanical drafting personnel and start your magnet or magnetic simulation instantly without any modification. If you wish to make a modification on the acquired CAD model, you won’t need to go back to the drafting personnel because commercial CAD packages such as Solidworks are parametric and hierarchical. Change it yourself "on the fly". If the drafting department or colleague use a different CAD package, most probably they can save it for you in Parasolid, ACIS, IGES, STEP, STL, CATIA, or ProE kernel. You then import it into SOLIDWORKS®, Autodesk® Inventor®, or Ansys SpaceClaim and continue your electromagnetic design.

EMS is a true multi-physics software and simulation package. It enables you to couple your magnet, magnetic, and electrical design to Thermal, Structural, and Motion analyses on the same model and mesh in a hassle-free integrated environment without any need to import, export any data. This integrated multi-physics environment means: no cluttering, no jumping around, no mishmashing, no chaos, no confusion, and no mess. It also means: efficiency, accuracy, and productivity.

Your design involves electro-thermal aspects? Easy and hands-free! Just check "Couple to thermal" steady-state or transient in the study properties. EMS automatically computes the joule, eddy, and core losses and feeds them into the thermal solver. You may readily add non-electromagnetic heat loadings by applying volume heat, heat flux, or simply fixed temperature. Taking into account the environment conditions such as convection and radiation, EMS thermal steady-state or transient computes the temperature, temperature gradient, and heat flux and saves them to "Thermal Results" folder.

By the same token, the electro-mechanical coupling is also easy and hands-free. The "Couple to structural" option invokes the EMS structural solver, after transferring the local force distribution in relevant parts in addition to the mechanical loads and constraints, and then computes the displacements. The stress and strain are deduced subsequently and added to the "Structural Results" folder as well. If the more general electro-thermo-mechanical coupling is desired, EMS transfers both the thermal and structural loads to the Thermal and Structural solvers. The Thermal solver, in turn, feeds the thermal loads to the Structural solver which computes the final displacements that reflect both the electromagnetic and the thermal loads while taking into account the magnetic, electrical, thermal, and structural environments.

Electrical machines and drives usually encompass moving parts and components. Generally speaking, the resulting motion is simply rotational such as motors or translational such as linear actuators. Nevertheless, some applications such MagLev and Eddy current braking may provoke all the motion six degrees of freedom. In such case, only EMS can handle such intricate machines and equipment. Why? Because EMS couples to the most versatile and powerful mechanical motion package, Solidworks Motion®. To find out more about this robust package, please visit: https://www.solidworks.com/sw/products/simulation/motion-analysis.htm The coupling to SolidWorks Motion® is again hassle-free. After creating a SolidWorks Motion® study, simply instruct EMS to couple to it. That is it and that is all.

In recent years a burgeoning number of free 3D CAD models -millions- have become available in CAD depositories such as grabcad.com, www.3dcontentcentral.com, and www.traceparts.com. Consequently, you can simply grab a CAD model from the depositories, make necessary changes, and start your finite element analysis instantly.

- Electric Force
- Electric Torque
- Magnetic Force
- Magnetic Torque
- Electromagnetic Force
- Electromagnetic Torque
- Magnetic Flux Density
- Magnetic Field
- Electric Field
- Electric Flux
- Current Flow
- Eddy Current
- Inductance
- Capacitance
- Resistance
- Hysterisis loss
- Eddy loss
- Speed
- Acceleration
- Stress

- Flux Linkage
- Core Loss
- Breakdown Voltage
- Lorentz Force
- Lorentz Torque
- Skin effect
- Proximity effect
- Magnetic Saturation
- Induced Voltage
- Force Density
- Power Loss
- Temperature
- Temperature Gradient
- Heat Flux
- Back EMF
- Electric flux density
- Impedance
- Ohmic loss
- Displacement
- Strain