Title:
ELECTRIC TOOL
Document Type and Number:
WIPO Patent Application WO/2017/022362
Kind Code:
A1
Abstract:
The objective of the present invention is to provide an electric tool with which it is possible to limit power consumption and also to limit torque pulsations without demagnetizing a rotor permanent magnet. To this end, the electric tool is provided with: a brushless motor including a stator having a plurality of windings and a rotor which is capable of rotating relative to the stator; a converting means for converting an alternating current voltage supplied from an alternating-current power supply into a direct current varying voltage; a voltage detecting means for detecting the varying voltage; and an energization switching means which has output lines for applying the varying voltage to the plurality of windings, and which causes the rotor to rotate by switching the energized winding to which the varying voltage is to be applied, from among the plurality of windings; wherein the energization switching means varies the number of energized windings on the basis of the varying voltage.
Inventors:
IWATA KAZUTAKA (JP)
FUNABASHI KAZUHIKO (JP)
FUNABASHI KAZUHIKO (JP)
Application Number:
PCT/JP2016/068990
Publication Date:
February 09, 2017
Filing Date:
June 27, 2016
Export Citation:
Assignee:
HITACHI KOKI KK (JP)
International Classes:
H02P6/10; B25F5/00
Foreign References:
| JP2013143878A | 2013-07-22 | |||
| JP2012090460A | 2012-05-10 | |||
| JP2012196725A | 2012-10-18 |
Other References:
See also references of EP 3331150A4
Download PDF:
Previous Patent: ELECTRIC TOOL
Next Patent: INFORMATION PROCESSING DEVICE, INFORMATION PROCESSING METHOD, AND PROGRAM
Next Patent: INFORMATION PROCESSING DEVICE, INFORMATION PROCESSING METHOD, AND PROGRAM