| 主权项 |
1. An induction motor comprising:
a housing having an outer surface, a stator retained within said housing, said stator having a stator cavity extending along a longitudinal direction, a rotor rotatably arranged within said stator cavity of said stator and configured to rotate relative to said stator around an axis extending along said longitudinal direction, a plurality of circumferentially spaced cooling fins arranged on said outer surface of the housing, each cooling fin extending along said longitudinal direction and projecting outwardly from said outer surface between a base portion located on said outer surface and a free end located at a fin distance, said fin distance being measured as radial distance between said axis and said free end, said rotor comprises a plurality of inner air ducts, each inner air duct being configured to allow passage of an airflow therethrough, said induction motor comprises a plurality of outer air ducts in fluid communication with said plurality of inner air ducts to form an air-circulation circuit, each outer air duct is arranged adjacent to respective one or more cooling fins and is spaced apart and separated from said respective one or more cooling fins, each outer air duct extends along said longitudinal direction, parallel to the respective one or more cooling fins, between a first end portion and second end portion, and wherein each outer air duct is arranged outside said adjacent on or more cooling fins and exhibits a minimum duct distance measured as the minimum radial distance between said axis and said outer air duct, said minimum duct distance being greater than the maximum fin distance of the respective adjacent one or more cooling fins. |
