Assertion: outrunner motor | /r/CapableOf | become popular
Facets:
value: due to high efficiency
type: CAUSE
value: due to their compact size
type: CAUSE
value: quickly
type: MANNER
Source sentences:
text: Outrunner motors have quickly become popular and are now available in many sizes.
text: They have also become popular in personal, electric transportation applications such as electric bikes and scooters due to their compact size and high efficiency.