Speed control device for DC motor
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专利名称：Speed control device for DC motor
发明人：Sakoh, Masahiko, c/o Makita Corporation 申请号：EP93304870.4
申请日：19930622
公开号：EP0576257B1
公开日：
19970212
专利内容由知识产权出版社提供
摘要：A speed control device for a DC motor controls the rotational speed of the DC motor through adjustment of a duty cycle of a semiconductor switching element. The rotational speed to be obtained is determined by an amount of operation of an operation member. A second contact switch is arranged to bypass the semiconductor switching element and is turned on to eliminate influence of the internal resistance of the semiconductor switching element. A power source contact switch is provided between a power source and the DC motor and is turned on and off through operation of the operation member. A switch-on forcing signal generation circuit and a switch-off forcing signal generation circuit are provided to forcibly switching on and off the second contact switch and the power source contact switch immediately before turning on and off thereof, respectively, so that the second contact switch may not be turned on and off when the semiconductor switching element is off and that the power source contact switch may not be turned off when the semiconductor switching element is on.
申请人：MAKITA CORP
地址：JP
国籍：JP
代理机构：Senior, Alan Murray 更多信息请下载全文后查看。