Improved connection of permanent magnets - FEA, CFD and Explicit Dynamics

Improved connection of permanent magnets

Electromagnetic – structural simulation of axial flux generators for wind turbines

All images: courtesy of DDIS

DDIS’s innovation lies in the development of axial
flow machines. Compared to conventional
generators with radial electromagnetic flux more
compact systems or systems with a much higher
power density are possible.
Permanent magnets are integrated in these systems
as central components. Due to the present
electromagnetic behavior, these elements are
exposed to high structural loads. With this analysis,
the electromagnetic force effect at different
operating conditions was to be determined and
evaluated. Different proposals of design changes
designs should be investigated as well in order to
improve the reliability of the electrical machine. ….

Solution 
The analysis of the electromagnetic fields within the axial
flux generator was set up in ANSYS Maxwell. Based on
the transient motion of the system, magnetic field
distributions arise as a function of the angle of rotation,
which are fundamental for the determination of the
electromagnetic forces.
To determine the structural mechanical stresses of the
rotor and stator components, a nonlinear FEM simulation
with ANSYS Mechanical was performed. The load
transfer from the electromagnetic analysis to the static
structural analysis took place via direct coupling of the
two analysis systems within ANSYS Workbench.

Various design variants and connection mechanisms
have been investigated during this project. Suggestions
for improving the reliability and fatigue life could be
worked out.

Read the article to hear about the significant benefits for the customer…. contact our engineers for more details.

Axial flux machine as generator integrated in a wind turbine

 

 

 

Insight into the conversion of mechanical power into electromagnetic power and vice versa by means of electromagnetic simulation

 

Transfer of the force densities from the electromagnetic analysis into the structural model for robust mechanical design of the magnets

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