Case Study / TORODIAL CORE MACHINE /
In the development of electromagnetic machines, efforts are made to minimize ohmic losses in the conductor. In large transformers, the sheet metal layout is designed to ensure the winding is as circular as possible, i.e., toroidal. This approach corresponds to the optimal solution of the isoperimetric problem.
In electromagnets, however, when torque calculation is based on the principle of Lorentz force, a conductor runs perpendicular to both the field and motion directions. As a result, geometric optimization opportunities in the design, which would be possible with the use of ferromagnetic materials, are not exploited.
Reduced manufacturing effort
Decreased rotor losses
Short axial length
The Project
Even in rotating machines, the isoperimetric approach offers added value. Utilizing soft magnetic composite (SMC) materials allows for a toroidal cross-section of the stator.
This technological pattern involves a ring-wound radial flux machine, developed based on the isoperimetric principle.
The Solution
Only through the adoption of soft magnetic composite (SMC) materials has the ring-shaped geometry of the wound stator become feasible. SMC allows for the guidance of magnetic flux in three dimensions without the occurrence of significant eddy current losses.
The Success
Instead of an orthogonal winding, a toroidal winding is possible - with significantly reduced manufacturing effort and markedly decreased ohmic losses in the conductor. With the BOMATEC Snakeline technology, an additional reduction in eddy current losses in permanent magnets can be achieved.
BOMATEC Snakeline Technology + Ring Winding
- Magnetic flux in three dimensions without significant eddy current losses
- Field excitation curve equivalent to distributed winding
- Substantially reduced manufacturing effort
- Markedly decreased rotor losses
- Reduction of ohmic losses in the conductor
- Short axial length of the machine
- Excellent cooling
- Significant reduction of eddy current losses in the rotor
- Additional reduction of eddy current losses in the permanent magnet
