POWER TOOL - HITACHI KOKI KK

Title:

POWER TOOL

Document Type and Number:

WIPO Patent Application WO/2014/192559

Kind Code:

A1

Abstract:

Provided is a power tool capable of maintaining the drive force for a motor and of preventing damage to a switching element, even for differing power supply voltages. An impact driver (1) has: a motor (3); a rectification circuit (23) that rectifies the input voltage from a commercial power supply (30); an inverter circuit (20) that supplies rectified voltage output from the rectification circuit (23), to the motor (3) as drive force; and a calculation unit (24) that, by changing the duty control of the motor (3) in accordance with the power supply voltage of the commercial power supply (30), suppresses the occurrence of overcurrent whereby the current value that flows to the motor (3) exceeds a prescribed current value.

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Inventors:

KOIZUMI TOSHIAKI (JP)
IWATA KAZUTAKA (JP)

Application Number:

PCT/JP2014/063074

Publication Date:

December 04, 2014

Filing Date:

May 16, 2014

Export Citation:

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Assignee:

HITACHI KOKI KK (JP)

International Classes:

B25F5/00

Foreign References:

JP2012196724A	2012-10-18
JP2010162672A	2010-07-29
JPH05317561A	1993-12-03

Other References: