Title:
電動工具
Document Type and Number:
Japanese Patent JP6753472
Kind Code:
B2
Abstract:
An electric tool capable of achieving inhibition of reaction due to braking in good balance with inhibition of voltage jumping due to regenerated energy is provided. A grinder (1) is provided with a motor (6), an inverter circuit (43) for supplying electric current to the motor (6), and a controller (50) for controlling the inverter circuit (43). When generating an electric braking force on a motor (6), the rotation speed of which exceeds a specified rotation speed, the controller (50) performs a first braking control of continuously turning on lower arm-side switching elements (Q4-Q6) of the inverter circuit (43), after which the controller performs a second braking control of repeatedly turning on and off the lower arm-side switching elements (Q4-Q6).
Inventors:
Yoshinari Takuya
Kazutaka Iwata
Kazutaka Iwata
Application Number:
JP2018553721A
Publication Date:
September 09, 2020
Filing Date:
October 27, 2017
Export Citation:
Assignee:
Koki Holdings Co., Ltd.
International Classes:
B25F5/00; B24B23/02; H02P3/18
Domestic Patent References:
| JP2012205362A | ||||
| JP2012016274A | ||||
| JP2012196143A | ||||
| JP2015211502A |
Foreign References:
| WO2016084553A1 | ||||
| WO2016098563A1 |
Attorney, Agent or Firm:
Takashi Murai
Hiromi Murai
Hiromi Murai