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Title:
ELECTRIC POWER TOOL AND CONTROL METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/184975
Kind Code:
A1
Abstract:
An electric power tool and a control method therefor, the electric power tool comprising: a functional element (12) used to realize a function of the electric power tool; a motor (13) operably connected to the functional element and used to output a power to drive the functional element to operate, the motor comprising a rotor, a stator and a stator winding; a drive circuit (22) electrically connected to the motor and used to drive the motor to output a power; and a controller (21) electrically connected to the drive circuit and used to output a control signal to control the drive circuit. the controller is configured to: output, according to a sampling current of the motor, a control signal that varies in response to changes of the position of the rotor to control the drive circuit such that the input voltage and/or current of the motor varies in an approximate sinusoidal wave. The electric power tool and the control method therefor enable the electric power tool to have a small torque ripple, a high heavy load efficiency and a good dynamic response.

Inventors:
XU, Yanqing (No.99, Tianyuan West Road Jiangning Economic And Technical Development Zon, Nanjing Jiangsu 6, 211106, CN)
WANG, Hongwei (No.99, Tianyuan West Road Jiangning Economic And Technical Development Zon, Nanjing Jiangsu 6, 211106, CN)
DING, Xiaogang (No.99, Tianyuan West Road Jiangning Economic And Technical Development Zon, Nanjing Jiangsu 6, 211106, CN)
YIN, Tiantian (No.99, Tianyuan West Road Jiangning Economic And Technical Development Zon, Nanjing Jiangsu 6, 211106, CN)
YANG, Dezhong (No.99, Tianyuan West Road Jiangning Economic And Technical Development Zon, Nanjing Jiangsu 6, 211106, CN)
DAI, Xiubo (No.99, Tianyuan West Road Jiangning Economic And Technical Development Zon, Nanjing Jiangsu 6, 211106, CN)
ZHEN, Wenqi (No.99, Tianyuan West Road Jiangning Economic And Technical Development Zon, Nanjing Jiangsu 6, 211106, CN)
Application Number:
CN2019/080085
Publication Date:
October 03, 2019
Filing Date:
March 28, 2019
Export Citation:
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Assignee:
NANJING CHERVON INDUSTRY CO., LTD. (No. 529, Jiangjun Road Jiangning Economic And Technical Development Zon, Nanjing Jiangsu 6, 211106, CN)
International Classes:
B25B21/00
Foreign References:
CN102271865A2011-12-07
CN105209222A2015-12-30
CN103348581A2013-10-09
US5195410A1993-03-23
Attorney, Agent or Firm:
BEYOND ATTORNEYS AT LAW (F6 Xijin Centre, 39 Lianhuachi East Rd. Haidian District, Beijing 6, 100036, CN)
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