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# Electrical power drivers et3026 wb lecture4-1

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### Electrical power drivers et3026 wb lecture4-1

1. 1. February 22, 2013 1 Elektrische Aandrijvingen WTB Lokatie/evenement P.BAUER
2. 2. February 22, 2013 2 Transformer • AC circuits • Isolate circuits • Voltage or current higher/lower
3. 3. Concept • The physics at work – electric transformer • Flux linkage between primary and secondary • Large air gap between primary secondary • Resonance to increase power transfer capability
4. 4. February 22, 2013 4 FIGURE 9-1 a. A voltage is induced in a coil when it links a variable flux . b. A sinusoidal flux induces a sinusoidal voltage. Voltage induced in coil FIGURE 9-2 a. The voltage E induced in a coil is equal to the applied voltage Eg. b. Phasor relationships among Eg, E, Im, and Φ. • E = 4.44 f N Φmax • Im = E/Xm • Eg = 4,44 f N Φ
5. 5. February 22, 2013 5 FIGURE 9-3 a. The flux in the coil remains constant so long as Eg is constant. b. Phasor relationships.
6. 6. February 22, 2013 6 FIGURE 9-4 Voltage induced in a secondary winding. Mutual flux is Φm1; leakage flux is Φf1. Elementary transformer
7. 7. February 22, 2013 7 FIGURE 9-7 a. Instantaneous polarities when the magnetizing current is increasing. b. Phasor relationship.
8. 8. February 22, 2013 8 FIGURE 9-8 a. The ideal transformer at no-load. Primary and secondary are linked by a mutual flux. b. Phasor relationships at no-load. Ideal Transformer • E 1= 4.44 f N1 Φmax • E 2= 4.44 f N2Φmax • E1/ E2 = N1/N2 • I1/ I2 = N2/N1
9. 9. February 22, 2013 9 FIGURE 9-10 a. See Example 9-4. b. Phasor relationships. • a = N1/N2= 1/25 • I1 = 25x2=50 A • 90 turns, 2250 turns, 200 V , 50 Hz , load 2A
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