Title:
ELECTRIC WORKING MACHINE
Document Type and Number:
Japanese Patent JP2018058143
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To properly perform PWM control at a set duty ratio, in an electric working machine which is constituted so as to perform the PWM control to the electricity-carrying of a motor by using complementary PWM.SOLUTION: An electric working machine 1 comprises a motor 25, a motor drive bridge circuit 31 and a control circuit 33. The bridge circuit 31 comprises a plurality of switching elements. The control circuit 33 PWM-controls the plurality of switching elements of the bridge circuit 31 following a set duty ratio. When the duty ratio is smaller than a threshold, the control circuit 33 performs complementary PWM as PWM control, and when the duty ratio is not smaller than the threshold, the control circuit performs non-complementary PWM as the PWM control.SELECTED DRAWING: Figure 1
Inventors:
TAKEDA KOICHI
Application Number:
JP2016196501A
Publication Date:
April 12, 2018
Filing Date:
October 04, 2016
Export Citation:
Assignee:
MAKITA CORP
International Classes:
B25F5/00; A01D34/78; H02M7/48
Domestic Patent References:
| JP2012130980A | 2012-07-12 | |||
| JP2016163452A | 2016-09-05 | |||
| JP2013021869A | 2013-01-31 | |||
| JP2007082303A | 2007-03-29 |
Foreign References:
| WO2010140212A1 | 2010-12-09 |
Attorney, Agent or Firm:
Nagoya International Patent Service Corporation