(19)
(11)EP 3 035 508 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
03.08.2016 Bulletin 2016/31

(43)Date of publication A2:
22.06.2016 Bulletin 2016/25

(21)Application number: 15201262.1

(22)Date of filing:  18.12.2015
(51)International Patent Classification (IPC): 
H02K 29/08(2006.01)
H02K 1/27(2006.01)
H02M 7/00(2006.01)
H02K 7/08(2006.01)
H02K 1/18(2006.01)
H02K 11/215(2016.01)
B25F 5/02(2006.01)
H02K 9/06(2006.01)
H02K 11/33(2016.01)
H02K 1/28(2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
MA MD

(30)Priority: 18.12.2014 US 201462093785 P
18.12.2014 US 201462093803 P

(71)Applicant: Black & Decker Inc.
New Britain, CT 06053 (US)

(72)Inventors:
  • Crosby, Colin
    Baltimore, MD Maryland 21224 (US)
  • Smith, David J.
    Columbia, MD Maryland 21045 (US)
  • Tennison, Merritt, J
    Seattle, WA Washington 9810 (US)
  • Purohit, Madhur M.
    Towson, MD 21286 (US)
  • Fogle, John B
    White Hall, MD Maryland 21161 (US)

(74)Representative: Bell, Ian Stephen et al
Black & Decker Patent Department 210 Bath Road
Slough Berkshire SL1 3YD
Slough Berkshire SL1 3YD (GB)

  


(54)BRUSHLESS MOTOR ASSEMBLY FOR A FASTENING TOOL


(57) An electric brushless DC (BLDC) motor is provided including an outer rotor assembly having a substantially-cylindrical metallic rotor body having, rotor magnets mounted within an inner surface of the rotor body, and a molded structure formed within the rotor body. The molded structure includes a main body formed on an inner surface of the rotor body to securely cover and retain the rotor magnets on the inner surface of the rotor body, an axial fan formed at an end of the rotor body opposite the rotor magnets, and a sense magnet mount formed at approximately a radial center portion of the axial fan. Alternatively or additionally, the molded structure includes a radial member projecting inwardly from the main body towards a center of the outer rotor assembly, and a bearing support member having a substantially cylindrical shape in an axial direction of the outer rotor and supported by the at least one radial member.







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