Nanjing Chervon Industry Co., Ltd.

Wenkang Tong

Xiangqing Fu

Yufei Ren

A power tool includes: an electric motor including a rotor and multi-phase stator windings; multiple power switches arranged between a power supply and the electric motor and including multiple high-side switches and multiple low-side switches; a parameter detection device configured to detect an electrical parameter of the electric motor; and a controller configured to output a control signal to control the multiple power switches and at least configured to control the electric motor to brake. The controller is further configured to: determine, according to the electrical parameter, a brake timing for braking the electric motor and start controlling the electric motor to brake when the brake timing arrives.

Power tool

A controller of a power tool outputs a driving signal to a motor driving circuit and acquires a position of a rotor of a brushless motor. While acquiring the position of the rotor of the brushless motor, a phase voltage or a line voltage of a winding of the brushless motor is detected through the voltage detection circuit. Whether an upper bridge arm switching element, a lower bridge arm switching element, and/or the brushless motor is short-circuited is determined according to the phase voltage or the line voltage of the winding of the brushless motor.

Power-on self-test method for an electric power tool and an electric power tool

An electric glue gun includes a housing, a motor supported by the housing, a bracket which extends from the housing for supporting a glue cartridge, a pushing mechanism, supported by the housing and connected to the motor, comprising a drive rod wherein the pushing mechanism is driven by the motor to enable the drive rod to squeeze glue out of the glue cartridge, and a controller configured to control the motor to enable the drive rod to return by a preset distance after the motor stops driving the drive rod forward or after the drive rod reaches a limited position.

Growing community of inventors

Nanjing, China

Wenkang Tong