Brushless motor for a power tool
US10931167B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 20, 2020 |
| Grant date | Feb 23, 2021 |
| Priority date | — |
| Expiry date | May 20, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/215
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power tool including a housing, a controller within the housing, and a brushless motor within the housing and controlled by the controller. The brushless motor includes a stator assembly, a rotor core, and a rotor enclosure. The stator assembly includes a stator core having stator laminations defining a stack length in an axial direction. The rotor enclosure includes a front end cap provided on a first side of the rotor core having a front bearing holder; and a rear end cap provided on a second side of the rotor core. The brushless motor further includes a fan, a front bearing, and a rear bearing. The front bearing holder and the fan define a bearing-to-fan length in the axial direction between axial ends of the front bearing holder and the fan, wherein a difference between the bearing-to-fan length and the stack length is less than 23.5 millimeters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.