An external rotor motor ( 1 ) has a stator ( 10 ), a rotor ( 20 ) and a cooling wheel ( 30 ) that rotates with the rotor ( 20 ) and the stator ( 10 ) to cool the stator ( 10 ). The stator ( 10 ) has an inner portion ( 11 ), enabling fluid flow, and a surrounding outer portion ( 12 ) enabling fluid flow. The flow is fluidically separate from the inner portion ( 11 ) in the radial direction (X). The cooling wheel ( 30 ) has a plurality of blades ( 33 ) to generate an overpressure and a negative pressure. The cooling wheel ( 30 ) generates a directed air flow (L) flowing from the outer diameter ( 32 ) of the cooling wheel ( 30 ) through the outer portion ( 12 ) and the inner portion ( 11 ) to the inner diameter ( 31 ) of the cooling wheel ( 30 ).
Patent
BriefPatent brief
Problem
How can vibration in electric motors and rotors be reduced?
Novelty
The stator ( 10 ) has an inner portion ( 11 ), enabling fluid flow, and a surrounding outer portion ( 12 ) enabling flui...
Uses
Patent review
Assignee
ebm-papst Mulfingen GmbH Co. KG
Published
Mar 10, 2026
Inventors
Jochen H fner
Domain
Electromechanical systems
Problem
How can vibration in electric motors and rotors be reduced?
Solution
external rotor motor ( 1 ) has a stator ( 10 ), a rotor ( 20 ) and a cooling wheel ( 30 ) that rotates with the rotor ( 20 ) and the stator ( 10 ) to cool the stator ( 10 ).
Key novelty
The stator ( 10 ) has an inner portion ( 11 ), enabling fluid flow, and a surrounding outer portion ( 12 ) enabling fluid flow.
Applications
Relevant search intents