 |
 |
Alternator/starter motor directly mounted on the end of the
crankshaft |
|
 Crea Scoopy-i
engine equipped with the ACG starter
 ACG
starter |
In order to start the engine smoothly from
the state of idling stop, the brush-less ACG starter has
been developed. This is an integrated component mounted
directly on the end of the crankshaft serving as a starter
motor and an alternator. The new ACG starter technologies
permits smooth starting, directly cranks the engine. This
eliminates typical noise from the starter gear engagement
or meshing.
The brush-less ACG starter is an outer-rotor type having
magnets in the flywheel. The stator is a 3-phase winding.
The flywheel and the stator serve as a DC brush-less motor
when the power is applied through the FET in the ECU.
The sensor magnet located in the center part of the rotor,
and the Hall-IC-type angle sensor mounted on the stator,
detect the rotor position. |
|
| Cross
sectional view of brush-less ACG starter |
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|
When the ACG functions as a starter motor |
|
ECU that controls
the ACG starter |
The rotor core, which serves as an iron
core, is located between the magnets in the rotor. A coil
is wound around the stator core, which serves as an iron
core. By this construction, the single unit serves both
purposes as a starter motor and an alternator.
When working as a starter
motor
The magnetic flux from the custom-shaped magnet acts on
the stator core via the rotor core. When the power is
applied to the stator coils, strong magnetic flux occurs
in the stator cores, producing adequate torque required
to crank the engine. |
|
Cross
sectional view of brush-less ACG starter
|
| When working
as an ACG (alternator) |
If an ordinary starter motor is rotated
to a high revolution, an excessive charging current and
a large friction from the core loss occur, which does
not allow a starter motor to serve as an alternator. In
the newly developed ACG starter, laying a rotor core between
the magnets has solved the aforementioned problem.
The magnetic flux from the magnets acts on the rotor core
and toward the stator core. When a charging current occurs
in the coil, the magnetic flux in the reverse direction
occurs in the stator core, increasing the magnetic flux
toward the rotor core and reducing the magnetic flux toward
the stator core. Thus, the friction from the core loss
has been successfully reduced while attaining an adequate
level of power generation. |
|
| When working
as an alternator |
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