发明名称 |
WORK TOOL |
摘要 |
To provide a work tool capable of suppress temperature rise in a motor or a switching element. The work tool includes: a motor; a switching element switchable between an ON-state and an OFF-state, the switching element allowing a current to flow through the motor during the ON-state, the switching element prohibiting a current from flowing through the motor during the OFF-state; target rotation number setting means for setting a target rotation number of the motor; rotation number controlling means for controlling the motor such that the rotation number thereof is brought in coincidence with the target rotation number by changing an ON-duration, during which the switching element is in the ON-state, in one switching period of the switching element; and temperature detecting means for detecting at least one of a temperature of the motor and a temperature of the switching element. The rotation number controlling means is capable of setting an upper limit with respect to the ON-duration on the basis of the temperature detected by the temperature detecting means and changes the ON-duration within a range not more than the upper limit. |
申请公布号 |
EP3112088(A1) |
申请公布日期 |
2017.01.04 |
申请号 |
EP20150754952 |
申请日期 |
2015.01.23 |
申请人 |
Hitachi Koki Co., Ltd. |
发明人 |
TAKANO, Nobuhiro;KAWANO, Yoshikazu;KOIZUMI, Toshiaki;TANIMOTO, Hideyuki;IWATA, Kazutaka;USHIWATA, Shigeharu |
分类号 |
B25F5/00;B23D45/16;B23D47/12;B24B23/02;B27B9/00;H02P29/00 |
主分类号 |
B25F5/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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