公开(公告)号：US08686675B2

公开(公告)日：2014-04-01

申请号：US12690083

申请日：2010-01-19

申请人： Yoshikazu Kawano ,  Nobihiro Takano ,  Eiji Nakayama ,  Kenro Ishimaru ,  Kazumi Tanaka ,  Masahiro Isono

发明人： Yoshikazu Kawano ,  Nobihiro Takano ,  Eiji Nakayama ,  Kenro Ishimaru ,  Kazumi Tanaka ,  Masahiro Isono

IPC分类号： H02P1/04

CPC分类号： H02P7/295 ,  B25F5/00

摘要： According to an aspect of the present invention, there is provided a power tool including: a motor; a switching device that switches over, in response to a conduction angle thereof, an AC voltage to be applied to the motor; a rotation speed setting unit that sets a target rotation speed of the motor; a rotation speed detection unit that detects an actual rotation speed of the motor; and a controller that determines the conduction angle by comparing the actual rotation speed with the target rotation speed and that controls the switching device by use of the conduction angle based on a maximum conduction angle, the maximum conduction angle being set in accordance with the target rotation speed.

摘要翻译： 根据本发明的一个方面，提供了一种电动工具，包括：电动机; 开关装置，其响应于其导通角切换要施加到所述电动机的AC电压; 转速设定单元，其设定电动机的目标转速; 转速检测单元，其检测所述电动机的实际转速; 以及控制器，其通过将实际转速与目标转速进行比较来确定导通角，并且通过使用基于最大导通角的导通角来控制开关装置，所述最大导通角根据目标旋转设定 速度。