An electronic speed control system and method is disclosed to control motors that power a load. The electronic speed control system is configured to monitor the motors, accept user commands for the motors, to process these inputs along with various motor parameters and/or models, and to generate motor commands to send to the motors. A field oriented control method continuously monitors voltages and currents from each motor phase; accesses the motor parameters; uses a model of the motor to calculate motor rotor flux, angle and speed based on the stator voltages and currents and the motor parameters; and generates motor commands for controlling the motor based on the user commands and the calculated values. The electronic speed control system can also control external accessories, and/or communicate with external applications which can include a motor identification system that can provide the motor parameters and model for the motor.

An electronic speed control system and method is disclosed to control motors that power a load. The electronic speed control system is configured to monitor the motors, accept user commands for the motors, to process these inputs along with various motor parameters and/or models, and to generate motor commands to send to the motors. A field oriented control method continuously monitors voltages and currents from each motor phase; accesses the motor parameters; uses a model of the motor to calculate motor rotor flux, angle and speed based on the stator voltages and currents and the motor parameters; and generates motor commands for controlling the motor based on the user commands and the calculated values. The electronic speed control system can also control external accessories, and/or communicate with external applications which can include a motor identification system that can provide the motor parameters and model for the motor.

A power system may include a first motor, a second motor connected in parallel to the first motor, a driver configured to supply a driving current to the first motor and the second motor and a controller configured to control the driver based on the driving current and a rotating speed of the first motor, and when the rotating speed of the first motor is different from a rotating speed of the second motor, the controller may control the driver so that the rotating speed of the first motor is equal to the rotating speed of the second motor. The power system may drive two and more motors at the same speed by applying the driving voltage based on the rotating speed and the driving current of one of two or more motors, using a single driving apparatus.

A power system may include a first motor, a second motor connected in parallel to the first motor, a driver configured to supply a driving current to the first motor and the second motor and a controller configured to control the driver based on the driving current and a rotating speed of the first motor, and when the rotating speed of the first motor is different from a rotating speed of the second motor, the controller may control the driver so that the rotating speed of the first motor is equal to the rotating speed of the second motor. The power system may drive two and more motors at the same speed by applying the driving voltage based on the rotating speed and the driving current of one of two or more motors, using a single driving apparatus.

A motor device includes motors, detector in the respective motors to detect motor rotational speeds, and an output controller configured or programmed to output a single output rotational speed based on the motor rotational speeds input from the detectors. The output controller multiplies at least one of the input motor rotational speeds by a coefficient derived based on target rotational speeds of the motors to calculate a conversion value, and determines the output rotational speed.

A motor device includes motors, detector in the respective motors to detect motor rotational speeds, and an output controller configured or programmed to output a single output rotational speed based on the motor rotational speeds input from the detectors. The output controller multiplies at least one of the input motor rotational speeds by a coefficient derived based on target rotational speeds of the motors to calculate a conversion value, and determines the output rotational speed.

A control method for a semi-centralized open winding multi-motor drive system includes: first, measuring current, voltage and position signal, computing system thrust by a velocity loop; then, distributing the thrust to each motor, converting the thrust into q axis current, computing dq axis voltages required for each motor by a current loop, and transforming the voltage demand to abc coordinate system through coordinate transformation; subsequently, modulating the voltage of each motor into a duty ratio instruction to judge whether the motor is in an over-modulated operating area, and performing over-modulation processing on the voltage in the over-modulated area; and finally, distributing the duty ratio instructions to independent and shared inverters. The control method of the present disclosure can reduce the hardware cost and improve the safety and reliability of the system.

A control method for a semi-centralized open winding multi-motor drive system includes: first, measuring current, voltage and position signal, computing system thrust by a velocity loop; then, distributing the thrust to each motor, converting the thrust into q axis current, computing dq axis voltages required for each motor by a current loop, and transforming the voltage demand to abc coordinate system through coordinate transformation; subsequently, modulating the voltage of each motor into a duty ratio instruction to judge whether the motor is in an over-modulated operating area, and performing over-modulation processing on the voltage in the over-modulated area; and finally, distributing the duty ratio instructions to independent and shared inverters. The control method of the present disclosure can reduce the hardware cost and improve the safety and reliability of the system.

A motor system includes an electrical appliance including a motor, a drive circuit to drive the motor based on a rewritable drive control parameter, and a detector to detect drive information of the motor, and an analyzer including a calculator. The drive information detected by the detector is output to an outside of the electrical appliance and transmitted to the calculator, the calculator performs adjustment of the drive control parameter based on the drive information transmitted, and the drive control parameter after the adjustment is transmitted to and set in the drive circuit.

A power tool is provided including a brushless direct-current (BLDC) electric motor having a stator and a rotor. The power tool includes power switches including high-side switches and low-side switches disposed on a direct-current (DC) bus line between a power supply and the electric motor, and a controller configured to electronically brake the motor by simultaneously closing the high-side switches or the low-side switches to electrically short the stator windings. In an embodiment, the controller is configured to monitor a voltage of the DC bus line, and if the voltage of the DC bus line is lower than a voltage threshold, execute electronic braking by toggling between closing the high-side switches and closing the low-side switches over braking cycles, and if the voltage of the DC bus line is greater than the voltage threshold, execute braking by closing only the high-side switches or the low-side switches over the braking cycles.