Core Loss Variable Definitions

Alpha - A curve fitting parameter that depends on the material. For sinusoidal excitations, it can be used in the equation to predict losses.

Beta - See Alpha.

Core Material - Select a preset material or "custom" from the dropdown list. The preset materials contain values for alpha, beta, and k. The materials Magnetics K, Magnetics R, and Magnetics P contain values only for the specified temperature (80°C, 100°C, and 80°C respectively), and so the temperature field is greyed-out. For the Philips materials we compute k based on the temperature input and several constants defined for each material with the following equation:

The values of C_m, c_t, c_t1, and c_t2 for each material are included in the table of material constants below.

Choose custom to specify your own values of the parameters alpha, beta, and k. These constants can often be found on the material datasheet to estimate losses from sinusoidal excitation using the curve fit:

Preset Material Constants
Material	Frequency	α	β	k	Cm	ct	ct1	ct2
Magnetics K (80°C)	<500 kHz	1.60	3.15	0.053
	500 kHz - 1 MHz	2.19	3.10	0.00113
	≥1 MHz	4.13	2.98	1.77x10-9
Magnetics R (100°C)	<100 kHz	1.43	2.85	0.074
	100 kHz - 500 kHz	1.64	2.68	0.036
	≥500 kHz	1.84	2.28	0.014
Magnetics P (80°C)	<100 kHz	1.36	2.86	0.158
	100 kHz - 500 kHz	1.63	2.62	0.0434
	≥500 kHz	3.47	2.54	7.36x10-7
Philips 3C92	20 - 100 kHz	1.19	2.65		0.0265	3.75	0.0543	2.68x10-4
	100 - 200 kHz	1.59	2.67		3.49x10-4	2.55	0.0305	1.51x10-4
	200 - 400 kHz	2.24	2.66		1.19x10-7	3.29	0.0437	2.08x10-4
Philips 3C96	20 - 100 kHz	1.34	2.66		0.00512	6.56	0.11	5.48x10-4
	100 - 200 kHz	1.72	2.80		8.27x10-5	2.83	0.0366	1.83x10-4
	200 - 400 kHz	2.22	2.46		9.17x10-8	3.39	0.0472	2.33x10-4
Philips 3F3	100 - 300 kHz	1.63	2.45		2.5x10-4	1.26	0.0105	7.9x10-5
	300 - 500 kHz	1.80	2.50		2x10-5	1.28	0.0105	7.7x10-5
	500 - 1000 kHz	2.40	2.25		3.6x10-8	1.14	0.0081	6.7x10-5
Philips 3F35	400 - 1000 kHz	2.95	2.94		1.23x10-11	2.03	0.0241	1.38x10-4
Philips 3F4	500 - 1000 kHz	1.75	2.90		1.2x10-4	1.15	0.011	9.5x10-5
	1 - 3 MHz	2.80	2.40		1.1x10-11	0.67	1x10-4	3.4x10-5
Philips 3F4	3 - 10 MHz	1.35	2.25		0.009	2	0.03	2x10-4

k - See Alpha.

Operating frequency - The built-in material properties depend on the frequency range. Choose the range that fits the application. This selection is separate from the flux waveform definition. See piecewise linear flux waveform.

Operating temperature - Temperature is only needed when using the Philips built in materials. The constant k is a function of temperature:

Piecewise linear flux waveform - Define the excitation waveform. Enter a number for the number of data points in the piecewise linear function and the table will automatically update with the correct number of rows. Time points should be increasing, or an error message will be produced. The first and last flux density values should match (since the waveform is cycled and an instantaneous change in flux density is not possible). If they do not match, a result will still be computed, but with a warning message.