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| Number | Title | Issue Date |
| 8159168 | Rotor position estimator for an electrical machine A method for estimating a rotor position in an electrical machine is provided. The method is applicable to electrical machines that have magnetic saliency. The method includes extracting the rotor position from a demodulated output signal generated in response to an... | 04/17/2012 |
| 8040087 | Control devices and methods A control device for driving a motor which includes a rotor and a stator is provided. The control device includes a Hall detector and driving circuit. The Hall detector detects magnetic flux variation when the rotor rotates and generates a first detection signal and... | 10/18/2011 |
| 7923956 | Control device for servo die cushion A control device, for a servo die cushion, capable of improving a response after overshoot generated by collision of a slide and a die cushion. The control device has a local maximum point judging part which judges a local maximum point based on the detected speed o... | 04/12/2011 |
| 7352436 | Lithographic apparatus, projection apparatus and device manufacturing method A control system to control a position of a substrate table for a lithographic apparatus, including: a first detection device to generate a position signal representative of the position of the projection system, a second detection device to generate a projection sy... | 04/01/2008 |
| 7342379 | Sensorless control systems and methods for permanent magnet rotating machines Systems and methods for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or hybrid switched reluctance motor, includes a stator having a plurality of phase windings and a rotor that rotates relative to the stator... | 03/11/2008 |
| 7288905 | Integrated circuit and method for trainable control and operation of DC motor A method and device for control of a low-cost DC motor such as that suitable for portable or battery-powered applications are disclosed such that an intended behavior for the motor may be programmed without reliance on external equipment or specific expertise. The i... | 10/30/2007 |
| 7250736 | Opening and closing member control system A motor drives a window glass of a door of a vehicle in an opening direction and a closing direction. A rotation sensing device outputs a pulse signal in response to rotation of the motor. A controller senses pinching of an object by the window glass based on the ro... | 07/31/2007 |
| 7250737 | Motor control apparatus A motor control apparatus includes a detection device for detecting a rotation speed of a motor, a storing section for successively storing the rotation speed detected by the detection device, a calculation device for calculating a variation amount of the rotation s... | 07/31/2007 |
| 7248012 | Teaching data preparing method for articulated robot Set the first temporary attitude of an end effector for a plurality of work points (step S3). Determine the attitude of an articulated robot at one-end first work point out of a plurality of work points (step S4). Determine the attitude of an articulat... | 07/24/2007 |
| 7245092 | Alignment stage apparatus, exposure apparatus, and semiconductor device manufacturing method An alignment stage apparatus including a vacuum chamber, a linear motor including a plurality of coils to drive a stage, a coil selector which selectively energizes the plurality of coils, and a storage box arranged to store the coil selector. The interior of the st... | 07/17/2007 |
| 7243058 | Method and circuit for operating a voice coil actuator of a mass data storage device A circuit (90) and method are presented to accurately determine a BEMF voltage of a VCM coil (20) after termination of a driving current in a first current direction in the coil (20). The circuit includes a circuit for activating selected VCM co... | 07/10/2007 |
| 7230401 | Apparatus and method for controlling an electric motor An apparatus for controlling an electric motor provided to drive a movable object such that a detected actual amount of motion of a movable portion of the electric motor or the movable object coincides with a target amount, comprising: ... | 06/12/2007 |
| 7208897 | Motion control system for barrier drive A system for operating a barrier system such as a garage door, gate or fence. A DC motor is connected to and operates a barrier drive. A power amplifier is configured to receive power signals from a power supply and to output modulated DC signals to the DC motor. A ... | 04/24/2007 |
| 7201064 | Panel bending machine A panel testing device, and a method of its use, for flexing and measuring mechanical properties of a panel are provided comprising a panel bending assembly operable to engage a panel and impart a bending force on the engaged panel, and a linear actuator having an o... | 04/10/2007 |
| 7199493 | Alignment stage apparatus An alignment stage apparatus includes a base structure and a movable stage which can move along a surface of the base structure so as not to be in contact with the base structure. The apparatus includes a plurality of power transmission coils buried under the surfac... | 04/03/2007 |
| 7193385 | Digital control of motor drives A digital controller is easily implemented for variable speed or torque control of an electric motor or generator by using a comparator to determine a choice of control state outputs. ... | 03/20/2007 |
| 7183738 | Motor control device A speed control means 7 for outputting a drive command signal for a motor 1 to make the speed of the motor 1 conform to the speed command signal based on a signal indicating the difference between the speed command signal and the detected speed ... | 02/27/2007 |
| 7181294 | Vibration control device A control device for controlling the motion of a movable part in a machine while suppressing vibration generated in the movable part. The control device includes a state-variable estimating section for estimating a state variable of a controlled system in the machin... | 02/20/2007 |
| 7145742 | Velocity controlled disk drive head retraction after power loss A control apparatus controls retraction of a device carried on a moveable member actuated by an electric motor after a sudden power loss. The control apparatus includes a measuring circuit for measuring a back electromotive force (back EMF) from the electric motor d... | 12/05/2006 |
| 7084534 | Alignment stage apparatus An alignment stage apparatus including a base structure and a movable stage, which can move along a surface of the base structure so as not to be in contact with the base structure. The apparatus includes a plurality of power transmission coils buried under the surf... | 08/01/2006 |
| 7079350 | Circuit and method for controlling the parking and unparking of a read-write head A control circuit controls a motor assembly having a coil and a movable arm. The control circuit includes a drive circuit that is coupled to the coil and that generates a drive signal in response to a control signal and a speed signal. The control circuit also inclu... | 07/18/2006 |
| 7061202 | Automobile servomotor controller An automobile servomotor controller includes a master control unit having a master control circuit for transmitting a designation signal and a slave unit having a motor and a control circuit which controls driving of a motor by outputting an operation signal to a dr... | 06/13/2006 |
| 7054710 | Electronic control for glass moulding machines Sections (22) of an I.S. glass forming machine (23) have a plurality of mechanisms which can be respectively driven by a first drive. Each first drive is allocated a controller which is connected to a first sequencer (60) via a first bus (59 | 05/30/2006 |
| 7038413 | Trapping detection device of opening/closing member A trapping detection device of an opening/closing member includes a motor, a motor speed detection device, a control device, a voltage detection device for detecting a drive voltage applied to the motor, an actual speed decision device for deciding the actual speed ... | 05/02/2006 |
| 7034492 | Methods and systems for reducing unintentional collisions A method for differentiating if a feedback signal is a result of an unintentional collisions in a servo system includes injecting a feed forward term in the servo system. ... | 04/25/2006 |
| 7030585 | Controller A controller capable of preventing response delay and generation of vibrations attributable thereto during position control of a movable part of a machine having low rigidity. A motor for driving a machine having low rigidity is subjected to position and velocity lo... | 04/18/2006 |
| 7019481 | Carriage driving apparatus and motor control method A carriage driving apparatus that drives a carriage of a printer or the like by a motor and a motor control method for controlling the motor can substantially eliminate variation in control accuracy among individual apparatuses. Each set of various parameters are de... | 03/28/2006 |
| 7015670 | Method of controlling a high-friction electro-mechanical servo-mechanism to minimize the power needed to hold a loaded output member The invention provides a method for controlling an electromechanical servomechanism (20) for moving an output member relative to a variable load (38). The servomechanism includes: a motor (37) having at least one coil (32A, 32B or ... | 03/21/2006 |
| 6998810 | Position controller of feed shaft A position controller for controlling a position of a feed shaft of a machine having a motor and the feed shaft driven by the motor is provided. A subtractor calculates a difference between a speed instruction and a speed detection value of a motor and outputs as a ... | 02/14/2006 |
| 6948079 | Method and apparatus for providing supply voltages for a processor For one embodiment of the present invention, a processor may include one or more integrated voltage regulators powered by an external voltage regulator and generating one or more local supply voltages for the processor. The one or more local supply voltages may be s... | 09/20/2005 |
| 6940248 | Motion controlling Motion controlling includes a combining network having an acceleration input for receiving an acceleration signal representative of acceleration of a movable element and a position input for receiving a position signal representative of position of the movable eleme... | 09/06/2005 |
| 6936990 | Method for controlling electric motor and apparatus for controlling the same An apparatus and method for controlling an electric motor is disclosed. The apparatus includes an instruction inputting section for transmitting an instruction for an electric motor or a control object coupled to said electric motor and a prefilter section for outpu... | 08/30/2005 |
| 6921248 | System for controlling the torsional stability of the drivetrain of a machine, in particular of a helicopter System for controlling the torsional stability of the drivetrain of a machine, in particular of a helicopter. The system (1) comprises a means (7) for acting on the speed of an engine (5) of the power train of the machine, a means (8 | 07/26/2005 |
| 6917486 | Direct detection of coil resistance Methods and computer program products for determining accurate estimates of coil resistance are provided. A voice coil voltage value and a corresponding voice coil current value are determined during a seek operation. Additionally, a velocity of the voice coil is de... | 07/12/2005 |
| 6911117 | Method and equipment for attenuation of oscillation in a paper machine or in a paper finishing device A method and apparatus for damping vibration in a paper machine. The apparatus having a dynamic damper which includes a weight suspended by a spring. The spring constant of the spring is changed by means of a control device in order to tune the natural frequency of ... | 06/28/2005 |
| 6903806 | Stage control apparatus, exposure apparatus, and device manufacturing method A stage control apparatus for controlling a motion of a stage. The apparatus includes a filter unit which eliminates a resonance frequency component contained in an input signal and outputs a control signal for controlling a motion of the stage, a generating unit wh... | 06/07/2005 |
| 6903529 | Method and apparatus for damping mechanical oscillations of a shaft in machine tools, manufacturing machines and robots Damping of mechanical oscillation in a shaft that is provided by feedback wherein the output signals of multiple feedback devices are negatively coupled and added to a desired speed signal of a motor speed controller of the driving motor is disclosed. At least one s... | 06/07/2005 |
| 6876168 | Disturbance attenuation in a precision servomechanism by a frequency-separated acceleration soft sensor In servomechanisms, like for example used in disk drives, disturbances, for example, friction, shock and vibration, prevent the system positioning accuracy from further improvement. These disturbances occur in a relatively low-frequency range compared to the electri... | 04/05/2005 |
| 6832127 | Motor controller A motor controller comprising a machine system (12) having a load machine (1), a transmission mechanism (2) for transmitting power, and a motor for driving the load machine through the transmission mechanism; a simulator unit (11) having ... | 12/14/2004 |
| 6831438 | Method and apparatus for controlling DC motor Controlling a direct current motor driving an object by determining, if the object does not reach a target position, a reference velocity corresponding to a point of time from a predetermined velocity trajectory, obtaining a position of the object, calculating a cur... | 12/14/2004 |
