Patent ID: 11919135
Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 15:
16. A method for operating a power tool based on a load state of the power tool, the method comprising:
operating, using a controller and a power switching network of the power tool, a motor of the power tool at a no-load speed at startup;
detecting, using the controller, the load state of the power tool, the load state indicating whether the power tool is in a loaded state or an unloaded state;
determining, using the controller, a first indication of current on a current path between the battery pack interface and the motor and a second indication of current on the current path a first current and a second current;
determining, using the controller, a difference between the first indication of current and the second indication of current;
determining, using the controller, whether the difference between the first indication of current and the second indication of current exceeds a predetermined divergence threshold;
determining, using the controller, that the power tool is in the loaded state when the difference between the first indication of current and the second indication of current exceeds the predetermined divergence threshold;
incrementally ramping up, using the controller, a speed of the motor from the no-load speed to a selected speed when the power tool is in the loaded state; and
incrementally ramping down, using the controller, the speed of the motor from the selected speed to the no-load speed when the power tool is in the unloaded state.