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AssigneeBlack & Decker Inc.
InventorsBrian E. Friedman, Peter Hague Wadeson, Eric Louis Kunz, BhanuPrakash Villuri, Tyler Petrus, Wing W. Lin
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An impact power tool includes a housing, a motor, a controller, an output member configured to be rotated when the motor is energized, and an impact mechanism configured to rotationally drive the output member. The impact mechanism is configured to selectively apply rotational impacts to the output member when a torque on the output member exceeds a torque threshold. The controller is configured to control the motor during a first phase of operation with open loop control and a baseline conduction band and advance angle setting when a sensed tool operation parameter is one of above or below a threshold value. The controller is configured to control the motor during a second phase of operation with closed speed loop control and an increased conduction band and advance angle setting when the sensed tool operation parameter is the other of above or below the threshold value.
A method for controlling power delivery to a brushless motor in an impact power tool with an impact mechanism that includes a hammer and an anvil, the impact mechanism configured to selectively apply rotational impacts to a tool holder, the method comprising:
A method for controlling power delivery to a brushless motor in an impact power tool with an impact mechanism that includes a hammer and an anvil, the impact mechanism configured to selectively apply rotational impacts to a tool holder, the method comprising:
A method for controlling power delivery to a brushless motor in an impact power tool with an impact mechanism that includes a hammer and an anvil, the impact mechanism configured to selectively apply rotational impacts to a tool holder, the method comprising:
Dependencies are inferred from the claim text.