The power tool of claim 1, wherein the controller is further configured to switch between driving the motor using centerline commutation to PWM commutation based on the speed of the. A power tool comprising: a brushless direct current (“BLDC”) motor anda controller configured to drive the motor using pulse-width modulation (“PWM”) commutation,determine a speed of the motor,compare the speed of the motor to a first threshold value, anddrive the motor using centerline commutation when the speed of the motor is greater than the first threshold value. By switching between speed control using the high-side FETs and speed control using the low-side FETs, the heat generated by freewheeling currents can be approximately evenly distributed among the high-side and low-side FETs.ġ. When operating in the centerline commutation mode, the high-side field-effect transistors (“FETs”) and low-side FETs can each be used for motor speed control.
![transition from bldc tool transition from bldc tool](https://img.staticbg.com/images/oaupload/banggood/images/8D/01/ffa7aa9f-c3ce-4016-8123-9586074247b4.jpg)
When the motor is rotating at a speed greater than a threshold speed value, the operation of the motor is transitioned to the centerline commutation mode. When the motor is rotating slowly, the motor is operated using PWM commutation. A BLDC motor of a power tool is controlled in either a pulse-width modulation (“PWM”) commutation mode or a centerline commutation mode. When operating in the centerline commutation mode, the high-side field-effect transistors (“FETs”) and low-side FETs c.īrushless direct-current (“BLDC”) motor and control for a power tool. Brushless direct-current (“BLDC”) motor and control for a power tool.