Starts the engine quiet and jolt-free, scooter starts moving smoothly

In the “idling stop system”, it is important to have a quiet starting charging system that keeps the battery adequately charged to assure starter motor operations. Also, it is important to have a fuel supply system that ensures restarting of the engine even after the throttle has been opened. The key component for engine starting and battery charging is the newly developed ACG starter having a combination of alternator and starter functions.

Alternator/starter motor directly mounted on the end of the crankshaft
Crea Scoopy-i engine equipped with the ACG starter
 Crea Scoopy-i engine equipped with the ACG starter


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
 Cross sectional view of brush-less ACG starter
When the ACG functions as a starter motor
ECU that controls the ACG starter
 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
 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
 When working as an alternator


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