Electric power tools
First Claim
Patent Images
1. 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.
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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.
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Citations
14 Claims
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1. An electric power tool, comprising:
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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. - View Dependent Claims (2, 3, 4, 5)
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6. An electric power tool, comprising:
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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. - View Dependent Claims (7, 8)
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9. An electric power tool, comprising:
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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.
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10. An electric power tool, comprising:
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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. - View Dependent Claims (11, 12, 13, 14)
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Specification