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Power tool

A technology for power tools and motors, applied in power tools, manufacturing tools, power components, etc., can solve problems such as reducing the dust resistance of power tools, increasing fan wind resistance loss, and reducing motor efficiency.

Inactive Publication Date: 2009-07-22
KOKI HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, ensuring a relatively large amount of blown air often easily causes dust such as iron powder and wood powder to enter the housing, thereby reducing the dust resistance of the power tool
Furthermore, the use of a larger fan size may increase the windage loss of the fan, thereby reducing the efficiency of the motor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] Embodiments of the present invention will be described below with reference to the drawings.

[0022] figure 1 A battery powered impact driver 1 according to a first embodiment of the invention is shown. see figure 1 , the impact driver 1 includes a brushless motor 3 , a cooling fan 13 driven by the brushless motor 3 , and a motor drive circuit 4 for driving the brushless motor 3 in the barrel portion 2A of the housing 2 . The impact driver 1 also includes a power transmission mechanism portion 5 for transmitting the rotational power of the brushless motor 3 in the housing 2 .

[0023] The brushless motor 3 receives power from a rechargeable battery 6 provided in the battery portion 2C of the housing 2 to rotate. The brushless motor 3 has a stator 7 fixed to the inner circumference of the housing 2 and a rotor 8 rotatably provided in the stator 7 . The brushless motor 3 has a rotating shaft 9 fixed to a rotor 8 . The rotation shaft 9 extends substantially in the ax...

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PUM

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Abstract

A power tool includes a brushless motor, a cooling fan, and a driving unit in a housing. The brushless motor is provided in the housing and having a rotary shaft. The cooling fan is attached to the rotary shaft in the housing, and rotatable together with the rotary shaft. The driving unit is provided in the housing for driving the motor. The driving unit includes an inverter circuit having a circuit board and a plurality of switching elements mounted on the circuit board. The circuit board is positioned on an opposite side to the motor with respect to the cooling fan. The plurality of switching elements is positioned around the cooling fan in a circumferential direction about the rotary shaft.

Description

technical field [0001] The invention relates to an electric tool with a brushless motor and a motor drive circuit for driving the brushless motor in a housing. Background technique [0002] A brushless motor with high efficiency is used as a drive source for electric tools. A motor drive circuit for driving the electric tool is provided in the housing separately from the drive motor. The motor drive circuit is constituted by an inverter circuit having a plurality of switching elements such as transistors and field effect transistors (hereinafter abbreviated as "FETs"). [0003] A high-intensity current flows through the conversion element, and the conversion operation is performed at high frequency in the inverter circuit, thereby increasing the heat generated by the conversion element. therefore. Forced cooling of the inverting circuit is required. For forced cooling of the inverter circuit, one example is to use a fan for cooling the conversion element. The path of co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K9/06B25B21/02
CPCH02K7/145H02K11/0073Y10S388/937B25F5/008H02K9/06H02K11/33
Inventor 岩田和隆坂本真一横田伴义吉田宪一郎西河智雅中川淳司
Owner KOKI HLDG CO LTD