Motor having an external heat sink for a power tool
US11139722B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 21, 2019 |
| Grant date | Oct 5, 2021 |
| Priority date | — |
| Expiry date | Feb 21, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K21/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor assembly is provided with a stator including a lamination stack forming a stator core, stator teeth inwardly projecting from the stator core, and stator windings wound around the stator teeth in connected in phases. A rotor is rotatably disposed within the stator with a shaft, a rotor lamination stack mounted on the shaft, and at least one bearing mounted on the shaft. An external heat sink is provided including a main body defining a hollow opening form-fittingly receiving the stator therein in thermal communication with the stator. A bearing support structure is provided having a main body radially arranged and secured the main body of the external heat sink, the bearing support structure forming a central bearing pocket arranged to receive and support the bearing of the rotor therein to axially and radially support the rotor with respect to the heat sink.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.