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Section E-1 Section E-1
COMMANDER 300
Theory of Operation .............................................................................................................Section E
General Description ..............................................................................................................E-2
Battery, Engine, Rotor, Stator and Engine Protection ...........................................................E-2
Weld Windings, Rectifier, Power Modules and Feedback.....................................................E-3
Control Transformer and Control Board ...............................................................................E-4
Insulated Gate Bipolar Transistor (IGBT) Operation .............................................................E-5
Pulse Width Modulation.........................................................................................................E-6
Chopper Technology Fundamentals......................................................................................E-7
TABLE OF CONTENTS
-THEORY OF OPERATION SECTION-
ENGINE
CONTROL
BOARD
ROTOR
CONTROL
TRANSFORMER
STATOR
AUXILIARY WINDINGS
ENGINE
PROTECTION
BATTERY
W
E
L
D
W
I
N
D
I
N
G
CHOKE
IGBT
IGBT
SHUNT
TO
CONTROL
BOARD
MECHANICAL
ROTATION
STARTER
ALTERNATOR
ENGINE
SENSORS
SOL
SOL
S
H
U
T
D
O
W
N
I
D
L
E
R
ARC
CONTROL
OUTPUT
CONTROL
MODE
SELECTOR
POWER MODULES
THREE-PHASE
RECTIFIER
WORK
TERMINAL
ELECTRODE
TERMINAL
__
+
42VAC
30VAC
30VAC
1
1
5
V
A
C
115VAC
RECEPTACLE
230VAC
RECEPTACLE
SLIP
RINGS
(TWO)
TO
CONTROL
BOARD
FIGURE E.1 – Commander 300 BLOCK LOGIC DIAGRAM