Abstract: A controller of a power tool is configured to, based on a sampled current of a motor of the power tool, output control signals that change with a change of a position of a rotor of the motor to control a drive circuit of the power tool such that an input voltage and/or a current of the motor changes approximately in a sine wave.

Abstract: A controller of a power tool is configured to, based on a sampled current of a motor of the power tool, output control signals that change with a change of a position of a rotor of the motor to control a drive circuit of the power tool such that an input voltage and/or a current of the motor changes approximately in a sine wave.

Abstract: A circular saw includes a control unit having a signal processing unit. The signal processing unit is configured to collect a bus current and/or a phase current of the motor and output a second drive signal to the drive circuit after the bus current and/or the phase current of the motor is processed by the signal processing unit, so that the motor charges a battery pack with a charging current less than or equal to 50 A. A control method may independently adjust the current of the motor in the circular saw by optimizing the processing for the phase current and/or the bus current of the motor and feed back electric energy generated by the motor to the power supply to optimize the utilization efficiency of the power supply.

Abstract: A robot system and a simultaneous performance control method thereof, comprising a primary robot and at least one secondary robot. Both the primary robot and the secondary robot respectively comprise a control module (101), a storage module (102), a wireless communication module (103) and an operation execution module (104). The control module (101) is connected to the storage module (102), the wireless communication module (103) and the operation execution module (104), respectively. The robot system and the simultaneous performance control method thereof can implement automatic performance of multiple robots, reduce dependency on a user, and function as a learning tool to provide a lifelike language learning environment for a learner.

Abstract: A robot system and a simultaneous performance control method thereof, comprising a primary robot and at least one secondary robot. Both the primary robot and the secondary robot respectively comprise a control module (101), a storage module (102), a wireless communication module (103) and an operation execution module (104). The control module (101) is connected to the storage module (102), the wireless communication module (103) and the operation execution module (104), respectively. The robot system and the simultaneous performance control method thereof can implement automatic performance of multiple robots, reduce dependency on a user, and function as a learning tool to provide a lifelike language learning environment for a learner.