Page 70 - MESINARUSTERUS

Penyelesaia 3.9
Jumlah dayakilas terjana dalam angker (armature)

Series field winding
I in P = 8, Z=1044, Φ = 35mWb,
I a T a = 209Nm, V t = 500V, R tot = 3Ω

G dc source
armature

Formula Ta = x

= = = 4.49 A

Voltan balikan (back emf ), Eb
Eb = - - V brushes = 500 – 4.49(3) = 486.53V

Nilai kelajuan

Eb = n =

= = 3.33 pss = 199.7 psm

Contoh 3.10
Sebuah motor pirau arus terus 18kW, 200V berputar pada 1500psm pada keadaan
beban penuh. Sekiranya rintangan angker motor berkenaan berjumlah 0.3 Ω dan
kejatuhan voltan merintangi berus sebanyak 2V, kirakan:-
i. Arusangker (Ia) apabila Eb = 225V
ii. Dayakilas aci/ keluaran Tsh

Penyelesaia 3.10

18kW
200V Diberi,

Ra = 0.3Ω G N = 1500 psm, V berus =2V
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