Power tool with motor having a multi-piece stator
US8558420B2 · kind B2 · utility
7Cited by
213References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 22, 2012 |
| Grant date | Oct 15, 2013 |
| Priority date | — |
| Expiry date | May 22, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K15/022
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power tool has a motor having a stator made by separately forming pole pieces and field coils. The field coils are placed over necks of the pole path pieces. An armature has an outside diameter of at least 0.625 the outside diameter of the stator is placed in the stator. The housing has a girth of 200 mm or less with the motor wound to provide a maximum watts out to housing girth ratio of at least 5 maximum watts outs to 1 mm of housing girth. The field coils may be formed so that they extend beyond pole tips of the pole pieces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.