Abstract: Provided are a method, apparatus, and storage medium for controlling a track seek servo in a disk drive. Thus, a transducer is moved to a target track using a transformed Proximate-Time Optimal Servo (PTOS) velocity trajectory in which an acceleration duration is symmetrical to a deceleration duration in a track seek mode.

Abstract: 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 controller reorganization conditions. Upon detecting available hot spot sensors, encoder failures and recoveries, and current sensor failures and recoveries, the reorganization switch control reorganizes itself via configuring at least one of the switches based on information in said decision matrix to operate without available sensors and using available sensors.

Abstract: A servo control system micro-electromechanical systems (MEMS)-based motion control system (and method therefor), includes a motion generator having an inherent stiffness component.

Abstract: Information indicative of the placement of spindle motor components may be obtained and used to provide a correction to one or more BEMF-derived attributes used to control the spindle speed. In some implementations, first and second signals indicative of BEMF of different stator windings may be used to determine a speed-related characteristic. The speed related characteristic may be used to determine an error amount, which may be used to determine a correction factor to control the speed of the spindle motor.

Abstract: In a position control device based on a current observer control for performing two degree of freedom control, calculation accuracy is improved using a fixed point processor. For a target position trajectory and position error, which are inputs of a two degree of freedom control system using an observer, relative values of which reference is the reference trajectory are used, so that the state variable of the observer can hold a relative distance from the reference position. Compared with the case of holding an absolute distance, a range where the value changes is smaller, and the number of effective digits of a decimal point can be increased, and calculation accuracy can be improved even if a fixed point method is used. As a consequence, control current becomes smooth and the generation of resonance and noise can be prevented in an acceleration period, and the generation of residual vibration can be prevented in a constant velocity period and deceleration period, and seek time can be decreased.

Abstract: An image forming apparatus including: (a) a feed mechanism including a motor and a feeder moved by the motor for feeding a medium; (b) a recording head for ejecting an ink toward the medium to form an image; (c) a feed controller for controlling the motor so as to move the feeder to a target operating position that causes the medium to be positioned in a desired position; and (d) an ink ejection controller for causing ink ejection portions of the recording head to eject the ink toward the medium. The feed controller includes: a target-operating-position changer for changing the target operating position as an original target operating position to a modified target operating position in which influence of a cyclic variation of an operation velocity of the feeder is smaller than in the original target operating position.

Abstract: The present invention discloses a method of servo controlling an electric motor during its start-up, comprising at least one step of measuring the speed after a determined duration counting from the commencement of start-up. During a first start-up, the servo control system determines the deviation between the value of the measured speed and a preset value. During a second start-up, the servo control system modifies at least one duration parameter of the commands applied to the motor as a function of the deviation determined during the first start-up, so as to reduce this deviation in the course of this second step. Advantageously, the start-up comprises three phases making it possible to start the motor while avoiding making it too noisy. The invention also relates to an apparatus implementing the method.

Abstract: A deflection amount Ps representing a difference between a position detection value Pl of a driven body and a position detection value Pm of a motor is detected. A position calculator proportional constant Kp, a time constant Tp of a first-order lag circuit that inputs a the deflection amount Ps, and a time constant Tv of a first-order lag circuit that inputs a difference between a speed detection value Vl of the driven body and a speed detection value Vm of the motor are changed based on the deflection amount Ps.

Abstract: An objective is to obtain a high robust position controller and a controlling method therefor, with respect to their technique in which control gain, in order to prevent an overshoot due to frictions, is most suitably adjusted. The position controller having a feedforward system includes: a friction-coefficient-estimated-value setting unit for setting arbitrary friction-coefficient-estimated-values; an overshoot-prevention-gain calculator for determining speed-integral-term feedforward gain, based on estimated friction-coefficient values set by the friction-coefficient-estimated-value setting unit; and a speed feedforward multiplying unit for calculating the product of the speed-integral-term feedforward gain multiplied by a feedforward command value that is based on a positional command; the multiplication product from the speed feedforward multiplying unit being used to reduce the feedforward term.

Abstract: A servo control device includes a current supply unit for supplying a drive unit with a drive current for driving a target to be controlled; a first detector for detecting at least the drive current value; and a logical arithmetic section which introduces a current command determining the drive current for controlling the drive speed of the drive unit to move the target to be controlled to a predetermined position, and which introduces the drive current value fed back from the first detector. The logical arithmetic section outputs the current command to the current supply unit after correcting the current command by a digital logic process on the basis of the drive current value.

Abstract: A measuring instrument comprising a stylus displaced following a work, the instrument further comprises a corrector for correcting a displacement in the translation axis direction value according to a height detection axis direction value of the stylus position in a plane specified by the height detection axis and the translation axis, the corrector comprising a calibration measuring device that obtains the calibration measurement data including the displacement information of the translation axis direction value corresponding to the height detection axis direction value of the stylus by moving the stylus; a correction parameter setting device that determines a correction parameter best suited for correcting the measurement error due to the vertical movement error of the stylus based on the displacement information of the stylus; and a measurement data correcting device that corrects a measurement data by using the correction parameter.

Abstract: A positioning control device executes disturbance observer control having a disturbance suppression function, wherein changes of control characteristics are prevented even if the disturbance frequency is suppressed. When a control value of an actuator is computed using estimated gains of the actuator and estimated gains of disturbance according to an estimated position error by disturbance observer control including a model of the actuator and model of the disturbance, the disturbance frequency is estimated according to the estimated position error, and the estimated gains of the actuator and the estimated gains of the disturbance, corresponding to the disturbance frequency, are changed. Therefore appropriate observer control according to the disturbance frequency can be implemented.

Abstract: A controller for a servomotor capable of improving accuracy of positioning and quality of a machined surface by switching modes of correction of a position command or the like, and reducing a shock at the time of switching. A correction amount generating section obtains a correction amount based on a value of a correction factor such as machine temperature. When the external signal is in ON state, a position command or the like is corrected by the correction amount obtained by the correction amount generating section and sent via switches. A correction amount holding section holds the correction amount obtained by the correction amount generating section. When the external signal turns to OFF state, the connection of the switches is changed so that correction is performed by the correction amount held in the correction amount holding section. When the connection of the switches is changed, the correction amount does not change rapidly, so that the machine does not suffer a shock.

Abstract: A signal processing device processes a position information signal (A sin?, A cos?) output from a sensor in accordance with a driving position of a motor and detects a driving speed of the motor. The signal processing device includes a position information signal processor (410) that processes the position information signal and calculates driving speed information of the motor, and an internal position information generator (460) that reflects a latest driving speed information (?n) calculated by the position information signal processor (410) and generates a latest presumed position of the motor as internal position information. The position information signal processor (410) calculates driving speed information (?n) of the motor based on a difference between the position information signal (A sin?, A cos?) from the sensor and the internal position information (A sin?n, A cos?n) generated by the internal position information generator (460).

Abstract: A position of a motion control axis is monitored and an output device responsive to the position of the motion control axis is controlled. The controlling further includes latching an electronic cam element that controls the output device, and unlatching the cam element that controls the output device. The manner in which the latching is performed and the manner in which the unlatching is performed are configurable in a programming interface. The programming interface is capable of receiving a latch position for the cam element and an unlatch position for the cam element. The programming interface is further capable of receiving additional configuration information to configure the manner in which the latching is performed and different additional configuration information to separately configure the manner in which the unlatching is performed.

Abstract: The method is for interacting with a wearable interactive device. A pathway extends through an interactive device that is non-slidably attached to the pathway. The pathway has a first end and a second end. At least one end of the pathway is attached to a body of a user. The user accelerates the device in a first direction. A sensor senses the acceleration in the first direction. The sensor triggers a motor to move gears so that the device travels towards the first end of the pathway. The user accelerates the device in a second opposite direction. The sensor triggers the device to move towards the second end of the pathway.

Abstract: In a positioning control device based on control of an observer having a disturbance suppression function, a disturbance suppression function according to a head position is added without impairing the control characteristics of the observer. The position control device has an observer having a disturbance suppression function comprising a model of an actuator and a model of disturbance, and a table for storing an estimated gain of the observer according to a position of the head. And an estimated gain is acquired from the table according to the position of the head, and an estimated gain of the observer is changed so as to change the disturbance suppression frequency characteristic. The disturbance suppression characteristic can be optimized according to the position of the head in the radius direction or between disks, and vibration of the head can be prevented even if recording density is increased.

Abstract: The invention concerns a switching device system including at least one switching device, signal means and control means. Each switching device includes at least one mobile contact part, an electric motor and, coupling means. The coupling means is arranged to transfer motion from the electric motor to the mobile contact part. The control means is arranged to control the switching device. According to the invention the control means is at least partly remotely located from the switching device. The signal means transmit signals from the switching device to the remotely located control means and vice/versa. The signals represent real-time data and/or off-line data. The invention concerns also a switching device, control means and methods related to the invented system as well as computer program products for such system and electric power system being provided with such system.

Abstract: A controller including a learning control unit for determining learning data based on a positional deviation between a target-position command commanding superimposed-type motion including repetitive motion and a positional fed-back variable obtained from an output portion of an electric motor; and an operation control section for controlling the electric motor based on a corrected positional deviation. The learning control unit includes a first learning section for periodically determining, based on the positional deviation, and storing, first learning data according to a first learning period; a learning-data correcting section for correcting the first learning data to eliminate an influence of a local change included in the target-position command or the positional fed-back variable and periodically arising according to a period different from the first learning period; and a positional-deviation correcting section for correcting the positional deviation by using corrected learning data.

Abstract: A method is employed to eliminate undesired velocity reversal in a motion profile. A start speed, a start acceleration, a speed limit, an acceleration limit, a deceleration limit, an acceleration jerk limit, and a deceleration jerk limit are programmed for the motion profile. A critical jerk value needed to avoid velocity reversal associated with the motion profile is calculated. The critical jerk value is compared to the programmed deceleration jerk limit. The larger of the critical jerk value and the programmed deceleration jerk limit is set as a computed maximum deceleration jerk limit for use with the motion profile. In this manner, the computed maximum deceleration jerk limit will never be lower than the critical jerk and undesired velocity reversal is eliminated.

Abstract: A method of optimizing a servo controller power required in the operation of two-dimensional flexure (Microelectronic Memory Storage) MEMS devices. Furthermore, provided is an arrangement for optimizing servo controller power in a two-dimensional flexure MEMS storage device through a utilization of the inventive method.

Abstract: An apparatus and associated method for observing an analog position signal of a control object in relation to positional indicia, recalling a previously stored runout correction value associated with the positional indicia, and calculating a corrected position signal for the control object in relation to the position signal and the runout correction value.

Abstract: The present invention relates to a safety system for use in protection functions, which system prevents that an error in one control circuit do not result in a function failure by using supervising functions comprising at least two sensors connected to a monitoring unit which receives and processes information about a position of a machine from both sensors and compares the results with stored values and a number of input conditions for the monitoring unit, whereby said sensors comprise means for generating data with respect to a position of a machine movement and said monitoring unit comprises means, which with respect to the result of the comparison is arranged to stop a machine movement if conditions for a stop are fulfilled. The monitoring unit is arranged to compare values from said sensors and when detecting deviating value from either one of sensors detecting a functional error with the sensors.

Abstract: A positioning control device based on an observer control has a disturbance suppression function to which a disturbance suppression function is added without affecting the control characteristics of the observer. Models of an actuator and a disturbance model are separated, and for the disturbance model, state information is generated using an estimated gain determined from a disturbance model defined by a transfer function of which denominator is a numerator of a filter in which degrees of denominator and numerator for shaping a sensitivity function are the same, and the disturbance suppression value of the actuator is computed from the state information. The vibration of the head can be prevented adapting to a wide range of disturbance frequencies without affecting the control characteristics of the observer.

Abstract: A method of controlling, by an adaptive control method, an electric motor as a drive source of an operating apparatus that operates, based on a driving force produced by the electric motor, under an arbitrary one of a plurality of operating conditions, and exhibits different dynamic characteristics corresponding to the plurality of operating conditions.

Abstract: According to a preferred aspect of the instant invention, there is provided a system and method of moving a disc drive arm in the presence of nonlinear magnetic bias. Further, in another preferred embodiment the instant method will be adaptive and/or self-corrective and is especially useful when used with disc drive hardware other than the hardware that was used to model the control law.

Abstract: In a method for controlling a positioning device, the positioning device has a stator and mover, the mover being movable relative to the stator; a position sensor configured to generate a position signal indicative of a position of the mover relative to the stator; a controller configured to receive the position signal, compare it to a setpoint signal to obtain an error signal, and generate a mover control signal on the basis of a signal component of the position signal, the controller having a variable gain. The positioning device, including the position sensor and the controller, defines a control loop. For error signals having a magnitude in a predefined range, the gain is selectively set to a value higher than a value for error signals having a magnitude outside the range.

Abstract: An exemplary anti-vibration apparatus used in an image pickup system includes a first light-reflecting unit, a driving mechanism configured for driving the light-reflecting unit to rotate, a servo circuit, at least one sensor configured for detecting an angular velocity of the anti-vibration apparatus and sending such signal to the servo circuit, the servo circuit is configured for generating a controlling signal received from the sensor and controlling the driving mechanism based on the controlling signal. The anti-vibration apparatus can eliminate the image vibration caused by the vibration of image pickup system.

Abstract: A synchronized rear vision system for a vehicle includes a pair of external side rearview mirrors for attachment to the vehicle and an interior rearview mirror for attachment to the vehicle. The synchronized rear vision system also includes a system master controller for detecting an instantaneous position of one of the side rearview mirrors and calculating position output signals for at least another one of the side rearview mirrors and the interior rearview mirror to automatically position at least the another one of the side rearview mirrors and the interior rearview mirror based on the instantaneous position. The synchronized rear vision system may include a controller to readjust the position of the rearview mirrors based on a position of a driver seat of the vehicle.

Abstract: An object of the invention is to provide a servo control device capable of making zero the positional deviation the positional deviation at a constant speed as well as the positional deviation at a constant acceleration or at constant acceleration and jerk, thereby providing a high-precision follow-up response. In order to solve this problem, the servo control device according to the invention includes a position controller (3) for generating a speed command that matches the motor output with a target position, a feed-forward controller (4) for adding a signal obtained by multiplying the differential of a target command by a gain and a signal obtained by multiplying the second-order differentiation of the target command by a gain and generating a speed feed-forward signal, and a speed controller (2) for performing I-P or PI control of the motor (1).

Abstract: A fixed-position stop control apparatus (10) includes: a move-instruction generating means (22) for generating a move instruction for each control cycle; a position loop control means (25) for position controlling a rotation shaft (61) for each control cycle according to the move instruction generated by the move-instruction generating means; and a speed loop control means (35) for speed controlling the rotation shaft according to one of a speed instruction generated by a higher level control apparatus (45) and a predetermined speed instruction, thereby switching the speed control of the rotation shaft by the speed loop control means to the position control of the rotation shaft by the position loop control means. In this fixed-position stop control apparatus, the move instruction generated by the move-instruction generating means has acceleration smaller than the acceleration corresponding to the acceleration and deceleration ability of the rotation shaft.

Abstract: An adjustable lectern includes a base portion having a tubular upstanding base member and a tubular upstanding tower member that is mounted in a telescoping arrangement with respect to the base member. The base member and the tower member are each respectively formed as rigid tubes or channels by a single, unitary piece of material such as sheet metal. The lectern further includes a work platform that is positioned at an upper end of the tower portion. The work platform is both vertically and horizontally adjustable with respect to the base portion, so that both users who will be standing behind the lectern making a presentation and users who will be sitting behind the adjustable lectern in a wheelchair when making a presentation may be accommodated. Both the work platform and the base member include industry-standard rackmount structure for facilitating integration of electronic components.

Abstract: A control unit of a motor driver performs feedback control to supply current to a linear motor based on a detection value of a linear encoder. An anomaly detection unit monitors the supply current to the linear motor, and the anomaly detection unit detects anomaly of a linear motion apparatus based on a waveform of the supply current. In the case where the anomaly is detected, a user is notified of warning by means of a lamp, a buzzer, an e-mail, and the like. Therefore, the anomaly of the linear motion apparatus can be detected early and accurately.

Abstract: At least one exemplary embodiment is directed to a control method for controlling a stage apparatus including a base and a stage, the base including first and second coil phases, the stage including a plurality of magnets. The control method includes a first energization step of rotating the stage to a stable angle by contemporaneously energizing a plurality of coils comprising the first coil phase and a second energization step of rotating the stage to a stable angle by sequentially energizing coils comprising the second coil phase one by one.

Abstract: A controller is disclosed that can be used in controlling a drive device of a disk drive, or other systems, in the presence of sinusoidal disturbances. The controller includes a calibration module that generates a plurality of reference states for a reference region of a disk of the disk drive. An initialization state generation module generates a plurality of initialization states for at least one other region of the disk as a function of the plurality of reference states, a displacement between the other regions of the disk and the reference region of the disk, and a reference state transition matrix. A control module generates a control signal for the drive device based on the plurality of initialization states.

Abstract: A motor control circuit for reducing current consumption. A stepping motor control circuit includes an A/B phase current setting signal generation circuit for generating an A/B phase current signal setting signals provided to a stepping motor driver to supply a stepping motor with a predetermined amount of drive current. Based on a switch signal, first and second switches selectively output an A/B phase current setting signal and an A/B phase reference signal, for reducing the drive current of the stepping motor more than the A/B phase current setting signal. An intermittent drive control circuit generates the switch signal. The stepping motor control circuit provides the motor driver with the A/B phase reference signal in accordance with the switch signal.

Abstract: A scanner system includes a servo control unit. A rotation angle of a rotating shaft supporting a mirror is detected, and an error of the detected value with respect to a commanded value is integrated by an integral compensator so that the detected value is able to track the commanded value. A tracking error proportional compensator is disposed in parallel with the integral compensator so as to add a correction value proportional to the error to the integrated value of the error. A plurality of gains are prepared for each of the integral compensator, the tracking error proportional compensator, a detected value proportional compensator and a detected value differential compensator of the servo control unit. Each gain is changed in accordance with a travel angle of the commanded value. Thus, the mirror can be positioned quickly so that the machining speed can be improved.

Abstract: A method of optimizing a servo controller power required in the operation of two-dimensional flexure (Microelectronic Memory Storage) MEMS devices. Furthermore, provided is an arrangement for optimizing servo controller power in a two-dimensional flexure MEMS storage device through a utilization of the inventive method.

Abstract: Arrangements and methods for implementing a “spin-down policy” for HDD motors that is “smart”, flexible and admirably achieves an objective of ensuring prolonged motor life as just discussed. To this end, one specific implementation involves (among other things) the addition of a dedicated cache that acts as a buffer element of sorts for writing or obtaining data during a period when a motor may be spun down, especially (but not necessarily exclusively) in instances when a notebook needs to be running for a large portion of the day. Other analogous implementations are of course possible that would achieve similar ends.

Abstract: Some embodiments of the present invention provide an anti-collision device used for a sample-loading system. This device may include a code plate, an optical coupler, a location signal-detecting unit, a drive pulse counting unit and a drive pulse-sending unit. The optical coupler detects the code plate during the relative movement between the optical coupler and the code plate and outputs detection signals. The location signal detecting unit determines whether to output location signals to the drive pulse counting unit. The drive pulse counting unit judges whether collisions occur to the sample-loading system. Some embodiments of the present invention provide an anti-collision method and a sample-loading system comprising the anti-collision device.

Abstract: An active front steering system includes a motor controller configured to compute a position error from a commanded position value and an actual position value, and then enter one of two modes—a commutation enable mode and a commutation freeze mode—depending upon the value of this position error. The commutation freeze mode applies when the absolute value of the position error is less than a predetermined threshold, and involves sending a set of signals to the motor's phase inputs such that commutation of the motor is prevented and a substantially constant motor hold torque is produced. The commutation enable mode applies when the absolute value of the position error is greater than or equal to the predetermined threshold, and corresponds to normal commutating operating mode.

Abstract: Optical disc drives designed for reduced power consumption switch the supply voltage in three stages between first, second, and third power supplies. The reduction in power consumption that is possible in the focusing and tracking drive circuits with three stage switching control is limited. This drive apparatus enables further reductions in power consumption. A drive output tracking signal is generated according to the drive conditions of the focusing or tracking drive circuit. The drive output tracking signal is applied to the drive circuit power supply, and the power supply is controlled according to the drive output tracking signal. A power supply change detector detects sudden changes in the drive output tracking signal, and inputs the detection signal to the DSP controlling the entire system. The DSP determines whether to improve the power supply response by comparison with predetermined conditions, and returns the result to the power supply.

Abstract: The invention relates to the field of material handling or logistic equipment in particular, relates to turntables, which can be used especially for automation of production line, assembly assistance, linefeeading and synchronous manufacturing. A high precision positioning powered turntable and its controlling method are disclosed herewithin, based on slewing ring bearing having an integral gear on the inner ring, and positively driven by a gear motor. A plurality of sensors and sensor flags are installed for monitoring position of the turntable top structure for controlling acceleration, deceleration and stopping. A controller, such as a programmable logic controller, is used for monitoring the position of the turntable top structure tlirough the plurality of sensors, and decides how it operates a motor drive, such as variable frequency drive, of the gearmotor for controlling the acceleration, deceleration and stopping of the turntable.

Abstract: An apparatus for detecting manufacturing parameters of a machine tool is provided, which comprises at least a sensing and transmitting module, and a receiving module. The sensing and transmitting module has a sensor and a wireless transmitting module. The sensor generates a sensing signal with respect to processing parameter of the machine tool. The wireless transmitting module converts the sensing signal into a wireless signal and transmits the wireless signal to the receiving module. Then the wireless signal is decoded and sent to a processing unit for compensating the machine tool. In the present invention, it is not necessary to consider wiring arrangement so that the sensors can be disposed at positions that are close to the mechanism whose operating status could affect the machining process and the compensation, generated according to the foregoing sensing data, for machine tool will be more effective to improve the machining accuracy.

Abstract: A controller for motor activation providing accurate and repeatable position changes by pressing and releasing a push button switch. Repeatable position changes are made in an advance direction by triggering a digital counter for a predetermined number of cycles of a reference clock signal. Backlash in retard motion of the motor is reduced by similarly asserting a retard motor input for an amount of time determined by another digital counter with a following advance correction made automatically after the retard signal is applied, by applying a predetermined retard-advance movement amount, as again counted by a digital counter. The advance binary amount, the retard binary amount and the retard-advance binary amount of set through binary switch inputs to respective counters to count the respective time periods (TG3, TG1, and TG2).

Abstract: A circuit is adapted to activate a writer head of a data storage media drive during both the boost periods as well as the steady state periods. The current supplied to the writer head during the boost periods exceeds the steady state current and flows between positive and negative voltage supplies so as to provide the required magnetic flux change in the inductor disposed in the write head. During the steady state periods, a switch circuit is turned on to provide a second current path across the writer head. During the steady state periods, the current flows between the positive voltage supply and the ground to reduce power consumption. The switch circuit is turned off during the boost periods.

Abstract: The invention relates to a method for the control of an electric machine (5), wherein a control unit (1) comprises a parameterisable speed control (26) and a parameterisable additional control (28). The electric machine (5) is provided in order to modify the position of a displaceable machine part (7,8). The position (29) of the displaceable machine part (7,8) is detected and at least one parameter (31) of the speed control (26) and/or at least one parameter (33) of the additional control (28) is modified according to the position (29) of the displaceable machine part (7,8).

Abstract: An actuating drive (60), that can be fed by a battery (6), for an actuator (5) comprises a drive unit (61) for operating the actuator (5), and a control unit (62), capable of communicating with an external station (70) in a wireless fashion, for controlling the drive unit (61). The control unit (62) can be fed via a voltage regulator (64) connected to the battery (6), while the drive unit (61) is directly connected to the output voltage (UB) of the battery (6). The energy consumption of the actuating drive (60) can be optimized in order to achieve a long service life for the battery.

Abstract: A servo control system micro-electromechanical systems (MEMS)-based motion control system (and method therefor), includes a motion generator having an inherent stiffness component.

Abstract: In the multi-shaft driving apparatus, position command pulse trains for servomotors are generated from a motor controller and supplied to motor drivers for the respective servomotors via a multichannel pulse train transmitting apparatus. The multichannel pulse train transmitting apparatus converts the position command pulse trains supplied from the motor controller 6 to serial signals in a transmission-side converter, combines the resulting serial signals as a stream signal, and supplies the signal to a reception-side converter via a serial signal transmission path composed of a pair of signal wires. In the reception-side converter, motor position command pulse trains in the form of a serial signal is returned to multichannel pulse trains in the form of a parallel signal which are supplied to the motor drivers. The number of wires between the motor controller and the motor drivers can be reduced.