W4920A
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ʻO waho rotor kaʻa-W4920A
ʻO ke ʻano o ke kahe axial, ka mīkini paʻa paʻa paʻa, ka mīkini commutation brushless. Hoʻokumu ʻia ia me kahi rotor o waho, kahi stator i loko, kahi magnet mau loa, kahi commutator uila a me nā ʻāpana ʻē aʻe, no ka mea he liʻiliʻi ka nui rotor waho, liʻiliʻi ka manawa o ka inertia, kiʻekiʻe ka wikiwiki, wikiwiki ka pane, no laila ʻoi aku ka nui o ka mana ma mua o 25% kiʻekiʻe ma mua o ka mīkini rotor i loko.
Hoʻohana ʻia nā motika rotor o waho i nā ʻano noi like ʻole, e komo pū ana akā ʻaʻole i kaupalena ʻia: nā kaʻa uila, nā drones, nā mea hana hale, nā mīkini ʻenehana, a me ka aerospace. ʻO kona kiʻekiʻe mana kiʻekiʻe a me ka hana kiʻekiʻe e hana i nā moto rotor waho i koho mua ma nā kahua he nui, e hāʻawi ana i ka mana mana a me ka hoʻemi ʻana i ka ikehu.