Stator Assembly

Section 3

DESCRIPTION & COMPONENTS

Figure 3-2. – The 2-Pole Rotor 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
11S
44S
55A
66A
77A
2
6
55
66
77

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).

Page 10

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