Invention Application
- Patent Title: POWER TOOL
- Patent Title (中): 电动工具
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Application No.: US15135979Application Date: 2016-04-22
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Publication No.: US20160336838A1Publication Date: 2016-11-17
- Inventor: Kei KOUDA , Akira NIWA
- Applicant: MAKITA CORPORATION
- Priority: JP2015098474 20150513; JP2015098475 20150513
- Main IPC: H02K11/215
- IPC: H02K11/215 ; H02K1/27 ; H02K3/18 ; B25B21/00 ; H02K3/46 ; H02K7/14 ; B25F5/00 ; H02K1/16 ; H02K3/28

Abstract:
A power tool, such as a hammer driver-drill (1), includes a brushless motor (8) having a stator (9) and a rotor (10). The stator (9) has slots (78) between teeth (63) that protrude inwardly. Coils (64) are respectively wound around each tooth (63) and the coils (64) of all phases are delta-connected in series. The rotor (10) includes permanent magnets (68) and is rotatably disposed in the interior of the stator (9). A sensor circuit board (65) is fixed to the stator (9) and includes magnetic sensors (66) that detect the rotational position of the rotor (10). The magnetic sensors (66) are provided at locations that correspond at least substantially to the centers of the slots (78) in the rotational direction of the rotor (10).
Public/Granted literature
- US10193422B2 Power tool Public/Granted day:2019-01-29
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