what are eddy current losses?
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Explanation:
As these losses are eddy-current losses, they can be reduced by careful material selection and thoughtful design. In designing an “energy efficient” motor, there are obviously several options. While energy saving is always desirable, there are cases where other considerations require a compromise. Guaranteed maximum iron losses will be obtained from the steel producer’s curves for the selected grade and thickness of the lamination. These losses are then usually increased by a factor of around 1.15 to allow for the additional losses due to punching. Reviews of the different losses in asynchronous machines have been published by Chalmers (1988) and Nürnberg and Hanitsch (1987). Insulation between the lamination for small motors may be done by steam-bluing the steel surfaces. The larger laminations will employ a phenolic or synthetic resin insulation on one or both sides of the lamination. In the case of single-sided insulation, it is ensured that the laminations are always punched and stacked in one direction, thus avoiding contact between punching burrs. Laminations decrease the amount of magnetic material available to carry flux within a given cross-sectional area. To incorporate this fact in analysis, a stacking factor is defined as:
fst=cross−section occupied by magnetic materialtotal cross−section
This factor is important for the calculation of flux densities in laminated magnetic materials. Typical stacking factors range from 0.65 to 0.95. Today, it is also possible to use bonded soft magnetic material to reduce eddy-current loss to a minimum. The soft magnetic material particles are suspended in a nonconductive resin. The small size of the magnetic particles used and their electrical isolation from each other increases the resistivity of the material. The effective permeability of the material, however, is decreased to 500 or 800. In a number of applications employing a three-dimensional flux path, this novel soft magnetic material has demonstrated its benefits. Wire erosion is often the best approach to prepare the magnetic circuit
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