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| Number | Title | Issue Date |
| 7427842 | Series motor and method of controlling the same A circuit for a series motor for a power tool is disclosed, wherein reliable switching is achieved by means of two electronic switches, without the use of a mechanically disconnecting switch. To this end, two electronic switches, preferably triacs, are preferably co... | 09/23/2008 |
| 7398834 | Hammer drill with selective lock-on A hammer drill comprising: a motor; a drive transmission capable of operating in at in at least a rotary mode and a reciprocating mode; a mode change mechanism; a switch which, when closed, provides power to the motor; and a mechanical lock-on mechanism which, when ... | 07/15/2008 |
| 7400106 | Method and apparatus for providing torque limit feedback in a power drill A battery-powered tool indicates to an operator that a torque limit has been reached. The tool comprises a driver circuit for generating motor interface driving signals, a motor interface circuit coupled to a motor to selectively couple power to the motor in accorda... | 07/15/2008 |
| 7372228 | Electric power tool with memory capability The invention relates to an electric power tool having a control and/or regulating device for an electric motor. It is provided that the control and/or regulating device (4) is assigned an electronic memory element (5) for at least one operating state ... | 05/13/2008 |
| 7359628 | Control device for an electric motor The invention relates to a drive device for an electric motor, in particular for a brushless DC motor in an electrical tool, which is powered by a rechargeable battery. The drive device has at least one power semiconductor, in particular for controllable application... | 04/15/2008 |
| 7330006 | Power tool A power tool includes a brushless motor, a cooling fan, and a driving unit in a housing. The brushless motor is provided in the housing and having a rotary shaft. The cooling fan is attached to the rotary shaft in the housing, and rotatable together with the rotary ... | 02/12/2008 |
| 7276878 | Amperage control for protection of battery over current in power tools Amperage control of a power tool motor is provided by pulse width modulation of current from a power supply. The pulse width modulation may be varied according to the determined motor current and measured power supply voltage. The power supply may include a battery ... | 10/02/2007 |
| 7274866 | Power tool and method for controlling a power tool 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 generat... | 09/25/2007 |
| 7211972 | Power tool with remote stop The present invention is directed to a power tool including a wireless remote stop for terminating the flow of electricity to an electric motor. The electric motor is configured for operating a working element assembly of a power tool, such as an arbor/circular saw ... | 05/01/2007 |
| 7177533 | Motor control system for a surgical handpiece A system and method for powered surgical handpiece capable of powering various micro-cutting instruments is described. The system is comprised of a controller adapted for controlling/interfacing with a powered surgical handpiece based upon user-defined procedural in... | 02/13/2007 |
| 7164252 | Electrically powered hand tool An electrically powered hand tool is described and which includes a three phase electrical motor having a plurality of poles; an electrical motor drive electrically coupled with the three phase electrical motor; and a source of electrical power which is converted to... | 01/16/2007 |
| 7137541 | Fastening tool with mode selector switch A fastening tool having a contact trip switch, a trigger switch, a driver, a motor assembly and a controller. The controller is configured to selectively operate the motor assembly in response to inputs received from the contact trip switch and the trigger switch. T... | 11/21/2006 |
| 7135791 | Electric tightening device A controller compares a minimum value of power source voltage which decreases in association with starting current generated upon start of a motor with a threshold value in a storing unit. When the minimum value is less than the threshold value, the controller notif... | 11/14/2006 |
| 7133601 | Amperage control for protection of battery over current in power tools Amperage control of a power tool motor is provided by pulse width modulation of current from a power supply. The pulse width modulation may be varied according to the determined motor current and measured power supply voltage. The power supply preferably includes a ... | 11/07/2006 |
| 7112934 | Electrical power tool having a motor control circuit for providing control over the torque output of the power tool A power tool such as an electric drill typically contains a gear train that couples the output spindle of the motor to the tool bit-receiving chuck. The control circuit for the power tool is operable in a ratcheting or pulse mode that causes the output spindle to ro... | 09/26/2006 |
| 7102303 | Generic motor control system and method A method for controlling the operation of a motor utilizing a universal motor control module. The method includes sampling at least one motor operating criterion during operation of the motor and executing a universal control algorithm at a predetermined periodic in... | 09/05/2006 |
| 7088066 | Automatic output power limiting electrical device An eletrical device derives power from an incoming power source to produce output plower to drive the device. The device includes circuitry that determines at lehst one characteristic of the incoming power source, and adjusts the output power used to drive the devic... | 08/08/2006 |
| 7075258 | Power control device of an electric tool, a method of power control of an electric tool and an electric tool provided with a power control device A power control device of an electric tool has a control or regulating device for adjusting a power output to an electric motor of the electric tool by means of a pulse width modulation, and a frequency transmitter that varies a frequency of the pulse width modulati... | 07/11/2006 |
| 7064502 | Power tool with remote stop The present invention is directed to a power tool including a wireless remote stop for terminating the flow of electricity to an electric motor. The electric motor is configured for operating a working element assembly of a power tool, such as an arbor/circular saw ... | 06/20/2006 |
| 7058291 | Brushless DC motor A system and method for reducing the cost of producing a brushless DC motor (58) is presented. The brushless DC motor (58) provides higher power density and efficiency with an increased tool run time. The brushless DC motor (58) includes a rotor... | 06/06/2006 |
| 6960894 | Cordless, powered surgical tool A powered tool for performing surgical procedures. The tool includes a handpiece in which a power generating unit is housed. A control member is mounted to the handpiece. The control member is mounted to the handpiece so that the orientation of the control member ca... | 11/01/2005 |
| 6954048 | Apparatus for monitoring electric motor screw driver system A driver monitor for a driver system. A driver monitor includes a driver monitoring unit for monitoring the fastening operation of the driver based on pre-determined fastening information. A rotation start signal and a rotation stop signal are used to determine whet... | 10/11/2005 |
| 6911793 | Operating procedure and cooling system mechanism for the motor of an electric powered tool An operating procedure for the motor (1) of an electric powered tool. The operating idle speed of the motor (1) is set to a value using regulator electronics (4), and the operating speed is the same as a chosen operating speed (n1). T... | 06/28/2005 |
| 6836614 | Electrical power tool having a motor control circuit for providing control over the torque output of the power tool A power tool such as an electric drill typically contains a gear train that couples the output spindle of the motor to the tool bit-receiving chuck. The control circuit for the power tool is operable in a ratcheting or pulse mode that causes the output spindle to ro... | 12/28/2004 |
| 6825630 | Machine tool, tool, and tool holder A longer life, low cost tool and tool holder enabling change of posture with respect to a spindle, having a high machining accuracy of a workpiece, and resistant to generation of vibration or heat, provided with a working tool for processing a workpiece, a motor hav... | 11/30/2004 |
| 6823134 | Automatic reverse motor controller A method and apparatus to automatically reverse the motor of a dispensing gun or similar tool. The invention includes a controller that automatically reverses the direction of plunger movement and removes the plunger from contact with the back wall of a cartridge. T... | 11/23/2004 |
| 6802637 | Hand-held mixer having a switching means configuration for switching to several lower speeds and for switching to a higher speed of mixing tools In a hand mixer (1) having two mains terminals (10, 11) and having interference suppression means (16) for a motor (27) and having a switching means configuration (130) which includes speed switching means (60) for switching... | 10/12/2004 |
| 6750622 | Motor controller system for battery-powered motors A motor controller system (15a) for dc power source motors (10) which includes a sensor device (16) that operates to measure and generate a voltage signal from the motor current and the rate of change of said current, and a programmable i... | 06/15/2004 |
| 6744155 | Momentum-decoupled direct drive A motor for driving a load, such as a tool or a workpiece, can be installed in a machine, for example an eccentric lathe. The motor has an output-drive section associated with the useful load, a reaction section which interacts with the drive section, and a base tha... | 06/01/2004 |
| 6741803 | Circuit and process for regulating the speed of universal electric motors A process and a circuit (2) for regulating the speed of an electric motor (1) having a high speed (N1) to at least one additional lower speed (N2, N3, N4), whereby, in a first prioritized step, depending on a preselected spe... | 05/25/2004 |
| 6741050 | Method of controlling and switching for braking an electronically commutated electrical motor A control method and a switching circuit for braking an electronically commutated electrical motor, wherein operation is in a phase period (T) of an inverter relative to at lest one winding, sequentially, both in a motoring mode and a generating operating mode using... | 05/25/2004 |
| 6741051 | Power tool trigger control A trigger controller for an electric power tool including a motor and a pull-trigger movable along a path having a foremost home position comprises a mechanical switch and a solid-state switch connected in series to the motor, wherein the mechanical switch includes ... | 05/25/2004 |
| 6700341 | Microcontroller for and a method of controlling operation of the safety clutch of a hand-held electric power tool A microcontroller for controlling operation of a safety clutch of a hand-held electrical power tool and which is arranged in a force transmitting chain of the tool, with the microcontroller including a unit (2,5,4;8) for processing at least one parameter ... | 03/02/2004 |
| 6680595 | Control method and apparatus of screw fastening apparatus It is an object of the present invention to overcome various drawbacks of a conventional oil pulse wrench by using an electric motor, to reduce a reaction force and to fasten a screw with high precision. To achieve the object, the invention provides a con... | 01/20/2004 |
| 6633149 | Method for digital control of a universal motor, in particular for electrical household appliances The invention concerns a method for digital control of a universal motor, in particular for electrical household appliance, comprising steps which consist on: measuring said engine (21) rotation speed; determining the difference between the measured speed... | 10/14/2003 |
| 6479958 | Anti-kickback and breakthrough torque control for power tool A rapid increase in motor current (di/dt above a predetermined threshold) causes the motor control system to enter pulse mode operation in-which the motor current is pulsed on and off rapidly to dislodge the workpiece obstruction or binding condition that... | 11/12/2002 |
| 6424799 | Electrical power tool having a motor control circuit for providing control over the torque output of the power tool A power tool such as an electric drill typically contains a gear train that couples the output spindle of the motor to the tool bit-receiving chuck and has associated therewith a degree of looseness which must be taken up before torque from the motor is a... | 07/23/2002 |
| 6424112 | Electric motor hand tool with digital input and control A speed control device particularly adapted for use with electrical motor-driven hand tools has digital operator input controls. A semiconductor switching device controls a percentage of ON time for the electric motor in the hand tool. Discrete and repeat... | 07/23/2002 |
| 6380702 | Commutator motor control system The invention relates to a control system for a commutator motor which is operated by phase-fired control. Allocation of a first and second control device in a single operating state without transition makes it possible to obtain constant jolting rotation... | 04/30/2002 |
| 6353705 | Speed control circuit of a direct current motor A speed control circuit of a direct current motor comprises a switching regulator IC 10. The switching regulator IC 10 is composed of a reference voltage generator 12 which generates a reference voltage of 5V, a first operational amplifier OP1, a second o... | 03/05/2002 |
