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US 2010/0163266 A1Published application
Electric power tools
AssigneeMakita Corporation
InventorsYutaka Matsunaga, Takuya Kusakawa, Motohiro Omura
Life of this patent
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Abstract
One aspect according to the present invention includes an electric power tool, in which a capacitor is positioned closer to a motor control circuit than a switch electrically connected to the motor control circuit.
Claims14
An electric power tool, comprising:
- a housing body part capable of housing a brushless DC motor as a driving source;
- a grip part formed to protrude from a lateral part of the housing body part;
- a switch part provided in such a position that allows a user to engage a finger of the user with the switch part while the user holds the grip part;
- a battery capable of supplying a power to the blushless DC motor;
- a three-phase bridge circuit configured to control the blushless DC motor and including switching devices;
- and
- a capacitor connected in parallel with the three-phase bridge circuit;
- wherein the three-phase bridge circuit is disposed proximal to the brushless DC motor within the housing body part, and the capacitor is disposed at a position proximal to the switch part.
5 more elements
An electric power tool, comprising:
- a housing body part capable of housing a brushless DC motor as a driving source;
- a grip part formed to protrude from a lateral part of the housing body part;
- a switch part provided in such a position that allows a user to engage a finger of the user with the switch part while the user holds the grip part;
- a battery capable of supplying a power to the blushless DC motor;
- a three-phase bridge circuit configured to control the blushless DC motor and including switching devices;
- and
- a capacitor connected in parallel with the three-phase bridge circuit;
- wherein the three-phase bridge circuit is disposed proximal to the brushless DC motor within the housing body part, and the capacitor is disposed at a position closer to the three-phase bridge circuit than the switch part.
5 more elements
An electric power tool, comprising:
- a DC motor;
- a control circuit capable of controlling the DC motor;
- a capacitor electrically connected to the control circuit;
- a switch electrically connected to the control circuit, so that the DC motor is driven under the control of the control circuit when the switch is operated;
- wherein the capacitor is positioned closer to the control circuit than the switch.
2 more elements
An electric power tool, comprising:
- a brushless DC motor as a driving source;
- a control circuit for controlling the brushless DC motor;
- and
- a capacitor connected in parallel with the control circuit;
- wherein the control circuit is positioned proximate to the brushless DC motor, and the capacitor is disposed at a position proximal to the control circuit.
2 more elements
Dependencies are inferred from the claim text.