Electric motor for a power tool
US10476350B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2017 |
| Grant date | Nov 12, 2019 |
| Priority date | — |
| Expiry date | Jul 7, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K9/06
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric motor includes first and second balancing members coupled to an output shaft for rotation with a rotor. The first and second balancing members substantially balance a mass of the rotor about a longitudinal axis of the output shaft to reduce vibrations of the electric motor during use. The first balancing member includes a brass bushing supported on the output shaft adjacent a first face of the body of the rotor. The brass bushing includes a hole drilled into an outer circumference of the brass bushing providing a first balancing feature of the electric motor. The second balancing member includes a fan supported on the output shaft adjacent a second face of the body of the rotor. The fan includes a plurality of fins extending from a first face of the fan and a second balancing feature of material removed from a second face of the fan.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.