Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 8154226 | Operating apparatus An operating apparatus including a main body, a movable member, a drive unit having a drive source, and a control unit controlling the drive source to control the position of the movable member relative to the main body. The control unit including a position control... | 04/10/2012 |
| 8129928 | Power branching system and power branching method Provided is a power branching system for driving a plurality of motors by use of a single servo driver, the power branching system capable of protecting each of the motors. The power branching system of the present invention has power lines 15 branched... | 03/06/2012 |
| 8125166 | Method for the predictive closed-loop control of a linear drive or of a linear compressor and linear drive or linear compressor subject to predictive closed-loop control A method for closed-loop control of a linear drive including a stator, a rotor configured for reciprocating movement along a drive axis therein, and a drive coil through which coil current flows, in particular for a linear compressor including a piston housing and a... | 02/28/2012 |
| 8115425 | Driving apparatus, industrial instrument, exposure apparatus, and device manufacturing method A driving apparatus electrically drives first and second components built in an industrial instrument. The first component drives a first element, and the second component drives a second element at a velocity higher than that of the first component. The driving app... | 02/14/2012 |
| 8093842 | Position controlled drive mechanism A position controlled drive mechanism and a control method for positioning a drive mechanism are introduced. A sensor generates a displacement signal indicative of a displacement of a movable stop driven by an electric motor. A controller controls rotation of the el... | 01/10/2012 |
| 8084969 | Hall-effect based linear motor controller A linear motion control device for use in a linear control system is presented. The linear motion control device includes a coil driver to drive a coil that, when driven, effects a linear movement by a motion device having a magnet. The linear motion control device ... | 12/27/2011 |
| 8044615 | Method for controlling AC linear motors, device for driving AC linear motors, and system of AC linear motors Provided is a method for controlling a plurality of AC linear motors of identical specifications which are connected each other and operated synchronously so that they appear to operate as a single linear motor having desired power. The method for controlling... | 10/25/2011 |
| 8040082 | Linear actuator A linear actuator includes a spindle nut, where the spindle nut and the spindle between a first and a second point, indicating the length of stroke, can move axially in proportion to each other, depending on whether the spindle or the spindle nut is being driven aro... | 10/18/2011 |
| 8035323 | Control of a linear motor Disclosed is a linear electric motor having a fixed primary comprising a stator divided into a number of sections, including a translating secondary having an operative length longer than any two adjacent sections of the stator in the form of a reaction plate, and a... | 10/11/2011 |
| 8030862 | Methods and systems for operating direct current motors A method for applying power to an electronically commutated motor (ECM) is described. The method includes connecting an AC voltage source to an input of a rectification circuit, connecting a DC voltage source to an output of the rectification circuit, and electrical... | 10/04/2011 |
| 8013547 | Detection and delimitation of maximum stator currents A device for driving a magnetic levitation train has at least one controllable power supply unit that feeds at least one multi-phase power supply line, and a long stator with stator windings that extend in switching sections of the long stator. Each switching sectio... | 09/06/2011 |
| 7994742 | Position measurement using magnetic fields A position sensing system includes a member movable along a path, the member having an elongated magnet extending along the path, the magnetic field orientation of the elongated magnet being at an angle with respect to the path. A sensor determines a position of the... | 08/09/2011 |
| 7990084 | Linear stepping motor A linear motor includes a stator having teeth symmetrically formed on upper and lower surfaces thereof at regular pitch; a movable member including upper cores disposed above the stator, lower cores disposed below the stator in symmetrical with the upper cores, and ... | 08/02/2011 |
| 7982417 | Stage unit, exposure apparatus, and device manufacturing method A stage unit includes the following elements. A stator includes a first coil array in which first coils extending in the x direction are arranged in the y direction, a second coil array in which second coils extending in the x direction are arranged in the y directi... | 07/19/2011 |
| 7969103 | Block switching transient minimization for linear motors and inductive loads A block switch controller for a linear motor is disclosed, the block switch controller having a motor current threshold profile controlling the switching of a plurality of block switches in a linear motor. Also, a block switch controller for a linear motor comprisin... | 06/28/2011 |
| 7932684 | Absolute position sensing To determine the relative position of movable portions of an assembly, a first magnetic device is coupled to a first portion of the assembly. The first magnetic device has a sensing surface with a number of magnetic poles that provide a magnetization state transitio... | 04/26/2011 |
| 7888893 | Control apparatus and method for linear synchronous motor The start timing of the pole position inference process of the linear motor installed vertically is delayed by a predetermined time after instruction of brake release. For example, from (1) increasing of the thrust instruction value of an ASR control system up to a ... | 02/15/2011 |
| 7868566 | Method for adjusting a piston in a linear compressor A method for operating a linear compressor including a linear drive with a stator and a rotor configured for displacement by a magnetic field of the stator against a spring force, and a compression chamber which is delimited by a displaceable piston coupled to the r... | 01/11/2011 |
| 7852022 | Control apparatus for electric car A control apparatus for an electric car, including a power converter which feeds AC power of variable voltage and variable frequency to a primary side member of a linear electromagnetic actuator, voltage command means for giving a command of a voltage which is fed t... | 12/14/2010 |
| 7839101 | Linear induction machine control scheme, systems, and methods A method and system for a control scheme for linear induction machines. The control scheme includes a maximum energy conversion ratio and a maximum acceleration and deceleration for linear induction machines. ... | 11/23/2010 |
| 7808132 | Electric machine comprising a screened leakage-field-sensitive sensor The aim of the invention is to improve the precision of measuring leakage field sensitive sensors on electric machines. According to the invention, the electric machine comprises a sensor device (4) which is sensitive to magnetic leakage fields mounted on one... | 10/05/2010 |
| 7795824 | Linear motor automatic control circuit assembly for controlling the operation of a 3-phase linear motor-driven submersible oil pump of an artificial oil lift system Connected to a 3-phase linear motor of a submersible oil pump of a crude oil production system, a linear motor automatic control circuit assembly is disclosed to include a linear motor power supply circuit, a CPU, an insulated gate bipolar transistor driving circuit... | 09/14/2010 |
| 7786685 | Linear motor and method for operating a linear motor A linear motor includes a primary part arranged as a guideway stator and at least one secondary part that is movable with respect to the primary part, the at least one secondary part having device(s) for controlling the generation of a magnetic field, causing its mo... | 08/31/2010 |
| 7786684 | Electromechanical flight control system and method for rotorcraft Flight control systems and methods for rotorcraft are provided. The flight control system includes a user input device and a motor in operable communication with the user input device. The motor includes a plurality of winding sets and an armature coupled to the plu... | 08/31/2010 |
| 7781993 | Path module for a linear motor, modular linear motor system and method to control the same A path module for a linear motor system includes a controller coupled to one or more amplifiers that are operative to control associated windings in the module. The controller receives control information via a communications link. The controller controls the amplif... | 08/24/2010 |
| 7679299 | Techniques for redundancy and fault tolerance in high demand machine safety applications Self-sensing feedback functionality for electromechanical actuators/motors is provided for use in operation and/or as a redundant safety mechanism to attain safety certification without adding extra bulk or wiring to the motor. An actuator can be manufactured having... | 03/16/2010 |
| 7656108 | Linear motor and transducer arrangement therefor An improved linear motor which compensates for manufacturing or assembly errors in the positioning of the magnetic field detectors. The linear motor synthesizes a correction signal which can be simply combined (for example added) to the output of one of the magnetic... | 02/02/2010 |
| RE41036 | Linear actuator control structure A control system for a linear actuator having an electric motor drawing a variable current level during operation. The control system includes a current level sensor for determining an operational current level of the linear actuator and a controller for generating ... | 12/15/2009 |
| 7633246 | Portable linear actuator and a method of limiting the maximum force of a motor of such an actuator A linear portable actuator including a direct current electric motor (2) rotationally driving a screw with the aid of a reduction element, wherein the motor (2) is controlled by an electronic module (5) comprising means (12) for the acqui... | 12/15/2009 |
| 7626348 | Linear motor door actuator The present invention relates to an alternating current electrical motor having a first element with magnets of alternating polarities, and a second element with electrical conductor coils, the first and the second elements being mounted for relative motion to one a... | 12/01/2009 |
| 7622833 | Machine, in particular production machine, machine tool and/or robot A production machine includes an electrical positioning drive having a stator and a moveable member displaceable relative to the stator in at least one travel direction. The moveable member is mounted, in relation to the stator, in a contactless manner by a magnetic... | 11/24/2009 |
| 7619377 | Linear motor system A linear motor system that can extend the stroke of a linear motor, with power saving and at a low cost, is provided. In a linear motor system, constituted by a linear motor 100, a controller 7 for supplying a variable voltage, a winding switchi... | 11/17/2009 |
| 7592760 | Lithographic apparatus and device manufacturing method A positioning device configured to position a first and a second movable object in a substantially common operation area is presented. The positioning device includes a first coil assembly arranged next to the operation area, a second coil assembly arranged at an op... | 09/22/2009 |
| 7589482 | Hot spot sensoring control of linear motors A system implementing a controller for linear motors is disclosed having a plurality of switches, a reorganization switch control detecting available hot spot sensors, encoder failures, and current sensor failures, and a storage storing a decision matrix having cont... | 09/15/2009 |
| 7579793 | System and method for efficient wide dynamic range coil drive Methods and systems are provided for driving one or more force coils. A system for driving force coils is provided including a PWM drive coupled to a first coil and a linear drive coupled to a second coil. The PWM drive efficiently drives the first coil to apply a f... | 08/25/2009 |
| 7557525 | Dual swing gate control system A control system and method for ensuring proper closure of a dual swing gate. The control system employs position sensors for monitoring the position of each gate arm. A “differential position” is maintained between the arms during closing to ensure proper seque... | 07/07/2009 |
| 7554277 | Circuit device for increasing the useable motor voltage in a long stator drive and method for operating a magnetically levitated vehicle provided with said type of circuit device A circuit device is disclosed which is used to increase useable motor voltage in a long stator drive. Further, suitable methods for operating a magnetically levitated vehicle provided with the circuit device are also disclosed. In one embodiment of the present inven... | 06/30/2009 |
| 7535187 | Linear traversing carriage incorporating an air gap inductive motivator The present invention relates to a linear traversing carriage for use in the papermaking industry and the like, which incorporates an air gap inductive motivator and eliminates all mechanical devices between the electrical power supply and the traversing mechanism. ... | 05/19/2009 |
| 7528560 | Driving controlling apparatus of linear compressor and method thereof A driving controlling apparatus of a linear compressor and a method thereof are disclosed, in which a stroke is variably controlled at the time of a compression processing and a suction processing thus to prevent a consumption power decrease and a refrigerating capa... | 05/05/2009 |
| 7528561 | Linear drive apparatus A linear drive apparatus comprising: a guide having an internal body; a slider moved along the guide, a driving mechanism for generating a driving force by magnetic interaction of the slider with the guide so as to linearly drive the slider; and a magnetic measureme... | 05/05/2009 |
