Outer rotor brushless motor having an axial fan

US11973374B2 · kind B2 · utility

Assignee

• BLACK & DECKER INC. · US

Inventors

• John B. Fogle · White Hall, US
• Dustin Jeffries · Baltimore, US
• Michael R. Marjomaa · Mount Wolf, US
• Kevin L. Pulley · White Marsh, US
• Vincent W. Zou · Timonium, US
• Jarrett A. Dunston · Bel Air, US
• David J. Smith · Columbia, US
• Rene Thieme · Riesa, DE
• Tim Heimrich · Bad Camberg, DE
• Tobias Heep · Steinbach, DE
• Daniel Bernhart · Bad Camberg, DE
• Dieter Schmidtfrerick · Idstein, DE

Key dates

• Filing date: Apr 23, 2020
• Grant date: Apr 30, 2024
• Expiry date: Sep 1, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H02K2205/09
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A brushless direct-current motor is provided includes an inner stator and an outer rotor. The rotor includes a rotor core disposed around the stator, an inner annular member mounted on a rotor shaft, and a plurality of radial blades extending angularly from the rotor core to the inner annular member forming a fan. A first end cap is provided including a radial back plate proximate the fan and a center opening in the radial back plate through which the rotor shaft extends. A second end cap is provided including a main body disposed adjacent the stator opposite the fan. The radial back plate of the first end cap includes at least one sloped surface forming at least one air gap such that the airflow generated by the fan is centrifugally guided within the first end cap by the sloped surface and caused to exit through the air gap.