High current and high frequency
Distribution
AC currents are also at low frequencies not everywhere in the conductor same.
Through my experience I quickly find the optimum conductor geometry.
Contacts
In high-frequency currents poorly designed contacts are a common reason for failure.
Design reliable contacts is one of my strengths.
Forces
The forces at high currents can be immense. Alternating currents additionally cause rapid force changes.
I’ll show you what a sturdy design looks like to resist the forces.
My offer
Eddy current
Capturing the current situation
Creating a model
(2D or 3D)
Simulation of eddy
current fields
Evaluate critical points
Create a report
Consulting
Circuit
Capturing the current situation
Create Spice model
Design components
Simulate current and
voltage behavior
Optimize circuit
Create recommendations
Consulting
Forces
Capturing the current situation
Creating a model
(2D and 3D)
Setting the material
parameters
Definition of magnetic forces as source
Analysis of the results
Optimization of the
design
Documentation of
variants
Consulting
Temperature
Capturing the current situation
Creating a model
(2D and 3D)
Setting the material
parameters
Definition of eddy
current losses as source
Analysis of the results
Optimization of the
design
Variant documentation
Consulting
Failure analysis HV transformer
In the charger for the pulse generators, the transformer is a key component. It must be high voltage resistant and operates at frequencies in the range of 20kHz. Eddy current effects are relevant here. This can lead to local overheating of the windings.
My contribution
Measuring important transformer parameters
Transformer failure analysis
Creating a 3D model and calculating parasite quantities
Modeling the temporal behaviour of voltage and current with Spice
Creating suggestions for improvement
Discussion the results
Heating pulse capacitors
The capacitors in pulse generators are loaded by high-frequency currents. This leads to a strong heating in a bad design, which damages the capacitor and ultimately destroys it.
The effect of these currents was analyzed experimentally and with simulations.
My contribution
Assessment of the current design and its limitation
Calculation of the internal key parameters with a 3D simulation
Design of the experimental test
Performing the test
Comparisons of the experimental results and the simulation results
Proposals for improving variants
Flexible power transmission junction
Busbars in energy transfer have to be flexibly connected to compensate for the thermal expansion. Commercially available flexible connecting elements are tightly tolerated and their assembly is complicated. The new flexible junction design had to be tested for thermal and mechanical compliance.
My contribution
Analysis of the specifications
Development of further specifications
Creating a 3D model
Calculation of the current distribution (eddy current)
Optimization of the design for the reduction of the losses
Coupled thermal simulation (electrical losses) < br> Simulation of deformation and mechanical stresses by the magnetic field
Discussion of suggestions for improvement and results
This is what others say about my work
“As a research partner we were able to develop a novel charger for capacitors with Reinhard Müller-Siebert as internal expert and project manager. Reinhard Müller-Siebert supported us technically with many simulations in the field of high-frequency currents. He was an excellent partner who efficiently advanced the project.”
