Class 388/824 - By variable impedance (e.g., potentiometer)

Subclass of Class 388 - Electricity: motor control systems
Definition: Subject matter wherein the control circuit includes a variable
No. of patents: 28
Last issue date: 09/25/2007

Number	Title	Issue Date
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
7231139	Digital noise reduction for motors A system and method for reducing fan noise by controlling the drive current to the fan motor. In one embodiment the system approximates a linear drive using a number of transistors in parallel and sequentially deploying the transistors. In another embodiment, a sche...	06/12/2007
7174972	Electrical hand-held power tool with non-contacting electrical manual control switch An electrical hand-held power tool includes a non-contacting electrical manual control switch (3) having an operating element (4) and a sensor switch (5), a pivotable carrier (6) which carries a switching element (13) and which is ...	02/13/2007
7159789	Thermostat with mechanical user interface A thermostat having a thermostat housing and a rotatable selector disposed on the thermostat housing. The rotatable selector adapted to have a range of rotatable positions, where a desired parameter value is identified by the position of the rotatable selector along...	01/09/2007
7159790	Thermostat with offset drive A thermostat having a thermostat housing and a rotatable selector rotatably coupled to the thermostat housing via a support member. The rotatable selector is adapted to have a range of rotatable positions, wherein a desired parameter value is identified by the posit...	01/09/2007
7150339	Electrically powered bicycle An electrically powered bicycle is disclosed including a rear fork assembly having a pair of structures extending from a frame, a wheel attached between the structures of the rear fork assembly, an electric motor mounted adjacent to the wheel, and a drive mechanism ...	12/19/2006
7046917	Speed controlling device of a motorized cart for a person to ride on A device of a cart includes a control, a speed regulating potentiometer, a microprocessor, a digital-to-analogue converter, a motor controlling unit, and a switch; the control is angularly displaceable and near to handlebars of the cart; the potentiometer is connect...	05/16/2006
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
6762578	Motor controller for a motor with feedback potentiometer The invention concerns a motor controller for a motor with a feedback potentiometer, preferably for central air valve actuation. In the field of climate control, for example for utility vehicles and motor vehicles, the air ducts in heating, air conditioning and/or v...	07/13/2004
5867002	Electromechanical device with variable resistance circuit for controlling a load, particularly of an electric motor The invention concerns an electromechanical device with variable resistance circuit serving to control a load. The device comprises a connection (10) for a source of power (12), a connection (14) apt to be connected to a load (16) supplied by the source o...	02/02/1999
5528721	Direct current motor speed control apparatus A DC motor control system reduces power demands imposed upon a DC power source energizing a utilizing device by varying the time during which power application occurs, but not the magnitude of the power which remains constant. The DC motor control system ...	06/18/1996
5414793	Speed control mechanism for a power tool A speed control mechanism allowing a user to control the operating speed of a power tool. The speed control mechanism includes a drive motor and a handle connected to the power tool including a trigger, a speed governor and a cam assembly. The trigger is ...	05/09/1995
5201023	Variable speed latching motor control A solid state electronic motor power control circuit for portable paint pumps having a MOSFET power control device and an operational amplifier connected to the MOSFET to selectively operate as a switch driver in a first state and as a linear gain amplifi...	04/06/1993
5003628	Variable speed D.C. motor control A manually operated switch lever moves arm 105 along resistor 113 to generate a "raw" motor speed demand signal which is amplified and inverted by amplifiers 115 and 119 to form a "base line" demand signal. The "raw" demand signal and a motor load signal at th...	03/26/1991
4976552	Sewing machine of a sewing machine by wireless controller A sewing machine having a wireless controller is disclosed, wherein the sewing machine substantially comprising a drive motor for driving the sewing machine, a separate controller adjustably operated to produce a variable set voltage for controlling the r...	12/11/1990
4831312	Speed control device for d-c motors A speed control device for d-c motors includes an IC control circuit having such a construction that a reference voltage is generated across two of its terminals C and D. Additionally, a current proportional to the armature current of the d-c motor is kep...	05/16/1989
4680517	Motor drive control device A motor drive control device to control the speed of a motor includes a drive control section in series with the motor. Only, when a speed setting voltage exceeds a first predetermined value the, drive control section conducts to energize the motor, and w...	07/14/1987
4644236	Drive restart control for ring spinning or twisting machine A device for controlling the output speed of a motor of a ring spinning machine, a ring twisting machine and the like in case of replacing travelers of such machines includes a speed setter for the motor and a potentiometer which is operatively connected ...	02/17/1987
4578621	Stock advancing apparatus with dancer operated potentiometer speed control A stock reel having a variable speed electric reel drive motor and a speed control potentiometer operated by a stock loop control arm for producing a variable control voltage correlative with the angular position of the control arm. The control voltage fr...	03/25/1986
4479077	Sewing machine with a universal motor In a sewing machine with a universal motor, a speed control for the motor, a lamp, and a plug connection on the sewing machine housing for connecting the power supply and speed control lines to the motor and to the lamp, for equivalent replacement of the ...	10/23/1984
4430576	Remote load selector circuit and method A method and circuit for controlling the selection of remote electrical loads. An illustrated embodiment of the remote load selector circuit is depicted in conjunction with an electric ceiling fan and is utilized to select rotation direction, light operat...	02/07/1984
4426605	Method of operating a shunt-wound DC motor as well as controlling device for the execution and application thereof So as to permit operating a shunt-wound motor with the series characteristic without the use of electronic armature current adjusters, it is proposed to start the motor (1) with the connection of start-up resistances (R1 -R4) and to ...	01/17/1984
4395667	Non-linear control arrangement for printing machines A non-linearly operating control arrangement for driving units, such as those of damping devices of printing machines, includes a plurality of parallel resistance-diode bridges having two inputs and two outputs, a pair of resistors interposed between one ...	07/26/1983
4347468	Electronic variable speed automotive blower control system This is concerned with an electronic variable speed blower control system primarily used for automotive installations which provides light gauge wiring between a potentiometer on or in the dashboard and infinitely variable speeds are acquired in the blowe...	08/31/1982
4292571	Control device for controlling the rotational speed of a portable power tool A speed control device for portable power tools having particular applicability to electric drills. The speed control device is adapted to automatically adjust the speed of the motor in accordance with changes in the diameter of the tool bit used. The dev...	09/29/1981
4119898	Pulse controllers A controller for a series electric motor is described of the type comprising means for applying D.C. pulses to the motor and means for controlling the mark/space ratio of the pulses applied to the motor. The current through the motor is sensed and the max...	10/10/1978
4008426	Electronic speed control systems for miniature direct current motors A miniature DC motor is connected to a DC source through a PNP type driving transistor. The back electromotive force of the motor which is proportional to the speed is applied to the base electrode of an NPN type control transistor through a variable resi...	02/15/1977
3959703	Speed control for pump of filling machines A pump speed control for filling machines in which the rotational speed of the pump is varied between its intake stroke and the discharge stroke by selectively controlling the speed of the driving motor as a function of the rotational position of the outp...	05/25/1976

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Class 388/824 - By variable impedance (e.g., potentiometer)