Power tool and method for controlling a power tool

Details Power tool and method for controlling a power tool Power tool and method for controlling a power tool

2007-09-25

2007-09-25

Ip, Paul (Department: 2837)

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Analog armature control

C388S937000, C388S809000, C318S245000, C173S217000

Reexamination Certificate

active

11432779

ABSTRACT:
A power tool is disclosed comprising a controller for controlling at least one operating parameter, a motor for driving a tool, at least three switching elements which are coupled to the controller, and a speed sensor for monitoring the speed of the motor to generate a speed signal, which is fed to the controller. The controller is configured so that, in dependence on the speed signal, with simultaneous activation of a first and at least one other of the switching elements, a control signal for changing the operating parameter is output, and that, in dependence on the speed signal, with activation of the first and at least one other switching element, a control signal for modified changing of the operating parameter is output (FIG.2).

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International Preliminary Report; Aug. 22, 2006; 7 pages.
International Search Report, Feb. 25, 2005, 3 pages.

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