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Title:
ELECTRIC TOOL, METHOD FOR CONTROLLING ELECTRIC TOOL, AND METHOD FOR SWITCHING ELECTRIC MOTOR CONTROL MODE
Document Type and Number:
WIPO Patent Application WO/2021/135720
Kind Code:
A1
Abstract:
An electric tool, a method for controlling an electric tool, and a method for switching an electric motor control mode. The electric tool comprises a functional element (11), an electric motor (38), a power supply module (31), a drive circuit (33), and a control module (30) electrically connected to the drive circuit (33) and used for outputting a control signal to the drive circuit (33), so as to control the drive circuit (33). The control module (30) is configured to control, when the electric tool is at a first operation stage, the drive circuit (33) in a first control mode, such that the voltage of the electric motor (38) changes in the form of a square wave along with the position of a rotor of the electric motor (38), and to control, when the electric tool is at a second operation stage, the drive circuit (33) in a second control mode, such that the voltage of the electric motor (38) changes in the form of a sine wave or a saddle wave along with the position of the rotor of the electric motor (38). The solution can improve the efficiency of the electric motor (38) and can effectively improve the performance.

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Inventors:
XU ZHEN (CN)
YANG DEZHONG (CN)
XU YANQING (CN)
Application Number:
PCT/CN2020/130794
Publication Date:
July 08, 2021
Filing Date:
November 23, 2020
Export Citation:
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Assignee:
NANJING CHERVON IND CO LTD (CN)
International Classes:
H02P6/08; H02P27/08
Domestic Patent References:
WO2019184975A12019-10-03
Foreign References:
CN110572089A2019-12-13
CN110171296A2019-08-27
CN106374787A2017-02-01
CN105391351A2016-03-09
CN1163506A1997-10-29
JP2002233183A2002-08-16
CN201911425767A2019-12-31
CN202010793310A2020-08-10
Attorney, Agent or Firm:
BEYOND ATTORNEYS AT LAW (CN)
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