ALTERNATORS
20
AAT
Design
•
3-
phase 8-pole pairs synchronous
generator with integrated rectifier and
voltage regulator,
•
Double insulated (G2) copper wire
of temperature class over 200°C for
stator and rotor windings,
•
Bolt connections stator taps-rectifier
ensure high reliability of connection,
•
Rectifier with power press-fit
type Zener diodes with operating
temperature Tj=225°C max mounted
bellow rear bracket (2 diodes in parallel
per phase as standard),
AAT
Main technical data
Type
AAT
Rated Voltage (V)
14
28
Rated Current (A)
220 - 270
120 - 200
Stator Diameter (mm)
165,5
Cooling
Air cooling / External fan Bi-directional or CW
Weight
1
(
kg)
13 - 15
Max Permanent / Short time
Rotational Speed (RPM)
7.000 / 8.000
Voltage Regulator
Mono-function (14V, 28V), Battery-less (28V),
Multi-function (14V)
Power diodes Type
Press-fit Zener (50A, 80A (14V) / 50A (28V))
Over-voltage Protection
YES
Zener Voltage (V)
19-25 (14
V) / 34-40 (28V)
Electrical terminalsMono/
Multi-function regulator
(
B+, D+, W, B-) / (B+, L, W, B-, DFM)
Drive end bearing /
Rear bearing dimension
30
x72X19, 30x72x27 / 20x28x13
Protection of the Slip rings and
Brushes Compartment
IP 56
Operating (Storage) Temperatures
- 40
°C to + 110°C (+ 130°C)
EMC
Approved (Regulative ECE-R10 Rev.3: 2008-08)
Options
Insulated ground (return).
Marine versions available.
1
without pulley
Applications
AAT alternators were developed for
heavy-duty and special applications with
high electric load requirements, specially
at idle speeds:
•
Commercial vehicles as buses,
trucks, …,
•
Buses where required additional
power supply for A/C,
•
Top class agricultural and constru-
ction machinery (combines, …),
•
Other heavy –duty and special
applications, where required high
output power.
•
Mono-Function Regulator (14V, 28V):
•
Self-Excitation Supply (D+, diode trio),
•
Thick-Film Hybrid, Microelectronic,
•
Multi-Function Regulator (14V):
•
Direct Excitation Supply (B+),
•
Microelectronic,
•
Metal-graphite brushes of increased
length and special bronze (CuSn5)
slip rings,
•
Big shaft diameter 22,2 or 30 mm,
•
External Bi-directional fan or lower
noise CW fan,
•
Special roller type sealed bearings
for high pulley loads and needle rear
bearing.
Features
•
Heavy-duty design,
•
Dust-proof,
•
High specific output power and high
output at idle,
•
Over-voltage protection,
•
Long life bearings and brushes,
•
Long life operation,
•
Better protection of alternator sub-
assemblies in harsh environment,
•
Trash screens available,
•
Additional protection covers available
for additional tube mounting for
clean air intake,
•
Max efficiency >70%,
•
EMC approved and certified.