Question

electric machines and drives

4.3 In the machine illustrated in Fig. 4.1, suppose each pole shoe has an arc length of 0.15 m and an axial length of 0.12 m. The air-gap length is 5 mm. (a) Ignoring the slotting of the rotor and assuming ideal iron, determine the flux per pole if each of the 2500-turn, series-connected field coils carries a field current of 1.2 A. (b) Suppose the width of the rotor teeth is equal to the width of the slots. If the magnetic field intensity in the iron can be considered zero up to a flux density of 1.4 T, at what value of flux per pole and field cur rent would the relationship between flux and field current be expected to depart from linearity? Section 4.1) B, T 0.4 0.3 0.2 -0.1 0 H, KA 100 200 300 Figure 4.26 Ferrite demagnetization characteristic for Problem 4.2.

Answer 1

PLongth.らrn m-o.oo 5 m ye luc lana s=-1 O.00 5 2500 x 112 冫 о . 22116 x 10 Maumum ur derni NL 니 955414 ǐち : o.IT