A driving system for electric vehicles. The driving system may have two or more electric motors, each with voltage inputs, which are connected to the axles and tires of the vehicle. A variable input control may provide a signal that indicates its current operation position to a vehicle control unit. The vehicle control unit takes the information from the variable input control and determines how much power to send to each of the electric motors' voltage inputs.

A power tool comprising a housing and a brushless direct-current (BLDC) motor disposed within the housing. The motor includes a stator and a rotor rotatable relative to the stator. The power tool is configured to generate a power output from the motor that is greater than 1200 continuous hot Watts out such that a quotient obtained by the power output measured in Watts (Wout), divided by an input measured in Volt-Amperes (Vain), and further divided by a volume of the power tool measured in cubic centimeters (cc), is greater than 600 Wout/Vain/cc.

There is provided herein an electrical motor and associated motor drive. The motor comprises an output shaft, and a speed sensor configured to measure the speed of the output shaft. The motor drive comprises a controller configured to output a current demand for the motor based on a speed error between a desired speed of the output shaft and the measured speed of the output shaft, and a feedback signal of the output current demand scaled by a first gain.

A device for controlling floating of a motor includes a speed calculator configured to determine whether a speed of the motor is equal to or higher than a set speed; and a detector configured to measure a back electromotive force by floating a phase voltage of the motor when the speed of the motor is equal to or higher than the set speed, and determine whether a zero-cross point of the back electromotive force and a zero-cross point of a phase current of the motor coincide with each other, in which the speed calculator is configured to release the floating of the phase voltage of the motor and drive the motor when the zero-cross point of the back electromotive force and the zero-cross point of the phase current of the motor coincide with each other. Therefore, there are scarcely torque ripples and noise is low.