Question

Partial data for a Philips ER35/21/11 ferrite core half is illustrated in Figure 2. Two of these core halves are placed together to form a closed magnetic path, with a winding encircling the center leg of the core set. The (Philips 3C90) material permeability is 19000, and the allowed flux density BS is approximately 0.35 T. A. Create a magnetic circuit model for a winding on this core set, including the reluctances of the main magnetic paths. (You need not consider "leakage flux traveling through the air.) B. Please find the specific inductance, AL, of the core set. AL is the number of nano-Henries for a single-turn winding. C. How many ampere-turns can be applied in a winding on the core without exceeding the maximum allowed flux density? D. What is the maximum (saturation) current limit for a 12-turn winding on the core? E. A 250 mm gap is now inserted in the center leg of the core set (by grinding down the center leg of one of the core halves). Find the inductance and maximum (saturation) current for this new configuration with a 12-turn winding. How does the total energy storage capability compare to the ungapped case? Ferroxcube ER cores and accessories ER35/21/11 CORE SETS SYMBOL PARAMETER (V/A) core factor C1 V. reflective volume L effective length effective area A minimum area mass of core half VALUE UNIT 0.849 nm^3 9710 mm^3 90.8 mm 107 mm^2 100 mm^2 23 Fig. 1 ER35/21/11 core half Figure 2: Partial data for an ER ferrite core half from Philips components.

Partial data for a Philips ER35/21/11 ferrite core half is illustrated in Figure 2. Two of these core halves are placed together to form a closed magnetic path, with a winding encircling the center leg of the core set. The (Philips 3C90) material permeability is 19000, and the allowed flux density BS is approximately 0.35 T.

A. Create a magnetic circuit model for a winding on this core set, including the reluctances of the main magnetic paths. (You need not consider "leakage flux traveling through the air.)

B. Please find the specific inductance, AL, of the core set. AL is the number of nano-Henries for a single-turn winding.

C. How many ampere-turns can be applied in a winding on the core without exceeding the maximum allowed flux density?

D. What is the maximum (saturation) current limit for a 12-turn winding on the core?

E. A 250 mm gap is now inserted in the center leg of the core set (by grinding down the center leg of one of the core halves). Find the inductance and maximum (saturation) current for this new configuration with a 12-turn winding. How does the total energy storage capability compare to the ungapped case?

Ferroxcube ER cores and accessories ER35/21/11 CORE SETS SYMBOL PARAMETER (V/A) core factor C1 V. reflective volume L effective length effective area A minimum area mass of core half VALUE UNIT 0.849 nm^3 9710 mm^3 90.8 mm 107 mm^2 100 mm^2 23

Fig. 1 ER35/21/11 core half

Figure 2: Partial data for an ER ferrite core half from Philips components.

partial data for a philips er352111 ferrite core half is illustrated in figure 2 two of these core halves are placed together to form a closed magnetic path with a winding encircling the cen 27845

Added by Cristian G.

Question

Please give Ace some feedback