| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent the over-heating due to the heat generation in electronic components for controlling the rotation, and further to prevent the increase of the size of an electric power tool. <P>SOLUTION: A space S1 is formed above a brushless motor as a first space by the difference from the total height of the electric power tool. A space S2 is formed in back of the brushless motor as a second space by the difference from the total length of the electric power tool. A power substrate 3 having electronic components for controlling the rotation of the brushless motor thereon is arranged in the first space S1, and a heat sink for cooling the power substrate 3 is arranged in the second space S2. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
