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Guardian Technologies 5209 User Manual

Page 12

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section 3
DescRiption & coMponents

Figure 3-2. – The 2-Pole Rotor Assembly

STATOR ASSEMbLY

The stator can houses and retains (a) dual AC power

windings, (b) an excitation winding, and (c) two bat-

tery charge windings. A total of thirteen (13) stator

leads are brought out of the stator can as shown in

Figure 3-3.
The stator can is sandwiched between an engine

adapter and a rear bearing carrier. It is retained in that

position by four stator studs.

11

44

22

77A

55

77

6

2

66

66A

55A

44S

11S

Figure 3-3. – Stator Assembly Leads

bRUSH HOLdER ANd bRUSHES

The brush holder is retained to the rear bearing car-

rier by means of two Taptite screws. A positive (+) and

a negative (-) brush are retained in the brush holder,

with the positive (+) brush riding on the slip ring near-

est the rotor bearing.

Wire 4 connects to the positive (+) brush and Wire 0

to the negative (-) brush. Wire 0 connects to frame

ground. Rectified and regulated excitation current, as

well as current from a field boost circuit, are delivered

to the rotor windings via Wire 4, and the positive (+)

brush and slip ring. The excitation and field boost cur-

rent passes through the windings and to frame ground

via the negative (-) slip ring and brush, and Wire 0.

This current flow creates a magnetic field around the

rotor having a flux concentration that is proportional to

the amount of current flow.

4

0

Figure 3-4. – Brush Holder and Brushes

OTHER AC gENERATOR COMPONENTS

Some AC generator components are housed in the

generator control panel enclosure. These are (a) an

Excitation Circuit Breaker, (b) a Voltage Regulator,

and (c) a main line circuit breaker.

EXCITATION CIRCUIT BREAKER:
The Excitation Circuit Breaker (CB2) is housed in the

generator control panel enclosure and electrically

connected in series with the excitation (DPE) wind-

ing output to the Voltage Regulator. The breaker is

self-resetting, i.e.; its contacts will close again when

excitation current drops to a safe value.
If the circuit breaker has failed open, excitation current

flow to the Voltage Regulator and, subsequently, to

the rotor windings will be lost. Without excitation cur-

rent flow, AC voltage induced into the stator AC power

windings will drop to a value that is commensurate

with the rotor residual magnetism (see Figure 3-5).

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