TECHNICAL FEATURES
BRUSHLESS ALTERNATOR/STARTER
This scooter uses a combined alternator/starter. The alternator operates as a 3-phase AC generator. The alternator/starter
also functions as a starter motor by applying current to the stator coil from the ECM to turn the flywheel. This component
uses no brush, resulting in a compact, light and maintenance-free alternator.
An angle sensor is attached to the stator to detect crankshaft position. Signals from a magnet that is integrated in the outer
circumference of the flywheel boss are received by the sensor and sent to the ECM. The ECM adjusts current to the stator
coil to turn the flywheel when starting, and to increase charging current under 3,500 rpm to enhance charging capability.
ROTOR CORE MAGNET
CRANKSHAFT
FLYWHEEL
STATOR
SENSOR MAGNET
ANGLE SENSOR
The flywheel is designed with inner magnets integrated in the rotor core. See below for benefits of this design.
•
When functioning as a starter motor, the magnetic flux occurs from the magnet and from the rotor core due to the
strong motor drive current, multiplying the magnetic force and providing a high torque from the alternator/starter.
•
When functioning as an alternator, the magnetic flux from the magnet passes through the rotor core, reducing the mag-
netic force to allow low-friction spinning of the alternator/starter.
STARTER MOTOR:
ALTERNATOR/STARTER:
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ROTATION DIRECTION
H TORQUE
ROTATION DIRECTION
TORQUE
W
w
20-3
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