Page 99 - Offshore Electrical Engineering Manual

86 CHAPTER 6 DC Generators

(A)
+ –

series
interpoles field
armature

regulator
shunt
field

(B)
++ – – –
COMMUTATING POLE

MAIN POLE
S ++ – – –
S N
N N
–
+
N S

S S
S N
N

FIGURE 2.6.4
Interpoles. (A) A schematic and (B) series and commutating pole connections of a
compound-wound direct current generator configured to avoid magnetisation of the rotor
shaft (the shunt field winding is omitted). The series field is connected for clockwise
current flow, and the commutating poles for anticlockwise flow.