US Patent:
20090021090, Jan 22, 2009
Inventors:
Hung T. Du - Reisterstown MD, US
Earl M. Ortt - Bel Air MD, US
Brandon L. Verbrugge - Towson MD, US
Garrett P. McCormick - Manchester MD, US
Michael A. Zemlock - North Haven CT, US
Eric J. Samuelsen - Stewartstown PA, US
Kevin M. Hogan - Jarrettsville MD, US
Jiaqi Zhang - Baltimore MD, US
Ren Hong Wang - Timonium MD, US
Frank A. Mannarino - Baltimore MD, US
Allison A. Smith - Baltimore MD, US
Spencer G. Maid - Fallston MD, US
Therese M. Rakosky - Ellicott City MD, US
Kyle J. Wheaton - Abingdon MD, US
Antonios M. Nicolaidis - Baltimore MD, US
Shane Ashley Moll - Mechanicsburg PA, US
James C. Benton - Bel Air MD, US
Eric L. Bernstein - Baltimore MD, US
Assignee:
BLACK AND DECKER INC. - Newark DE
International Classification:
H02K 1/18
Abstract:
A power tool has a motor having a stator made by separately forming pole pieces, return path pieces and field coils. The field coils are placed over necks of the pole path pieces and the return path pieces are affixed to the pole pieces. An armature having an outside diameter of at least 0.625 the outside diameter of the stator is placed in the stator. The field coils may be formed so that they extend beyond pole tips of the pole pieces.