公开(公告)号：US20230011554A1

公开(公告)日：2023-01-12

申请号：US17852065

申请日：2022-06-28

Applicant: MAKITA CORPORATION

Inventor： Jie CHEN ,  Katsuhito FUJINAMI ,  Hong Jun PANG ,  Ya WANG ,  Fuchao LUAN ,  Akira NAITO

IPC: H02K9/22 ,  B25F5/00 ,  B24B23/02 ,  B24B47/12 ,  H02P27/02 ,  H02K11/33

Abstract: An electric work machine in one aspect of the present disclosure includes an electric power input terminal, a motor, a circuit board, a first heat dissipation plate, and a second heat dissipation plate. The circuit board includes a first surface and an electronic circuit on the first surface. The electronic circuit controls supply of AC power to the motor. The electronic circuit includes an electronic component that generates Joule heat. The first heat dissipation plate is spaced from the first surface by a first distance in parallel to the first surface. The second heat dissipation plate is spaced from the first surface by a second distance in parallel to the first surface. The second heat dissipation plate is thermally coupled with the first heat dissipation plate. The second distance is smaller than the first distance.