发明名称 |
A handheld grinder with a brushless electric motor |
摘要 |
A handheld grinder (10) comprising a housing (12); a grinding disk (22); a motor (28); an output shaft connected to the grinding disk (22) and the motor (28) to impart rotary motion thereto; and a circuit board (40) residing in the housing (12) and having thereon a rectifier (44) that receives an alternating current and converts the alternating current to a direct current, a switching arrangement having a plurality of motor switches connected electrically between the rectifier (44) and the motor (28) and operates to deliver the direct current from the rectifier (44) to the motor (28), a capacitor (50) connected electrically between the rectifier (44) and the switching arrangement, wherein the capacitor (50) is coupled in parallel across the rectifier (44), a driver circuit interfaced with the motor switches and operable to control switching operation of the motor switches, and a power switch (32) connected electrically between the rectifier (44) and the driver circuit and operable to selectively energize the driver circuit and power on the grinder disk (22). |
申请公布号 |
EP2873494(A3) |
申请公布日期 |
2016.04.13 |
申请号 |
EP20140188197 |
申请日期 |
2014.10.08 |
申请人 |
BLACK & DECKER INC. |
发明人 |
VANKO, JOHN CHARLES;FORSTER, MICHAEL K.;VELDERMAN, MATTHEW;HOWSON, JOHN |
分类号 |
B25F5/00;B24B23/02;B24B47/12;H01L23/00 |
主分类号 |
B25F5/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|