Abstract: A robot includes an actuator that changes an angle of a second member relative to a first member in accordance with a command value. In a first step of an angle calibration method, a measurement object distance is obtained by measuring a distance between wall surfaces of the two measurement object portions, the measurement being made while the actuator is given an arbitrary command value. In a second step, an angular difference is obtained by calculation, the angular difference corresponding to a difference in distance between two measurement object portions, the calculation being made based on a reference measurement object distance obtained in the past and the measurement object distance obtained in the first step, the reference measurement object distance having been obtained by measuring the measurement object distance while the actuator was given an arbitrary command value.

Abstract: A method for enhancing a vehicular driving assistance system includes obtaining in-vehicle test data representative of performance of the vehicular driving assistance system of a vehicle during operation of the vehicular driving assistance system and determining, using the in-vehicle test data, a second order transfer function that models operation of the vehicular driving assistance system. The second order transfer function matches a magnitude response of the in-vehicle test data. The method includes providing a simulation environment. The simulation environment simulates the vehicular driving assistance system using the second order transfer function. The method includes determining, using the simulation environment, a feedforward contribution and a feedback contribution of the vehicular driving assistance system, and enhancing the vehicular driving assistance system based on adjustment of the feedforward contribution and the feedback contribution of the vehicular driving assistance system.

Abstract: The invention relates to a method for predicting maintenance/replacement period for a component of a vehicle, the vehicle comprising a power-assisted steering system including a steering actuator (14) configured to assist in steering the vehicle at least as compensation for angular deviations of the road wheels (16) caused by road disturbances. The method comprises acquiring over time steering output data indicative of a magnitude and/or frequency of assisted steering as compensation for angular deviations of the road wheels (16) caused by road disturbances, comparing the acquired steering output data with stored component wear data, the stored component wear data being indicative of when maintenance/replacement of the component is due based on wear caused by road disturbances, and determining, based on the comparison of the acquired steering output data and the stored component wear data, whether or not maintenance/replacement of the component is due. The invention also relates to a system (10).

Abstract: A method for use an original robotic working tool and a replacement robotic working tool, the method comprising: connecting the original robotic working tool to the replacement robotic working tool; transferring operational data from the original robotic working tool to the replacement robotic working tool and enabling the replacement robotic working tool to operate as a replacement for the original robotic working tool.

Abstract: A control device calculates a position deviation between a position of a movable member designated by a position command and a measured position of the movable member by a position detector at each sampling period, adds a disturbance signal generated from a phase signal having a predetermined period to a drive signal generated from the position deviation to which an amount of correction is added, causes a motor for driving the movable member to operate based on the drive signal to which the disturbance signal is added, calculates the amount of correction by using a dynamic characteristic compensation filter in such a way as to reduce the position deviation, and changes a configuration of the dynamic characteristic compensation filter in such a way that an evaluation value related to magnitude of the position deviation satisfies a predetermined condition.

Abstract: A method and controller compensates control variables of a continuous process prior to the control variables being input to the controller/control matrix to at least partially mask the effect of a selected disturbance or a manipulated variable on that controlled variable to the controller. The controlled variable(s) has been chosen to be an inference of a desired underlying or related variable which is not directly measurable. The selected disturbance to be masked is one which does affect the (measured) controlled variable, but not the underlying desired variable. By at least partially masking the effect to all intents and purposes the controller is unaware of the effect of the selected disturbance on the controlled variable and therefore, for a fully masked disturbance, does not make any adjustment to a manipulated variable associated with the selected disturbance which would unnecessarily alter the underlying desired variable.

Abstract: An aircraft may include a control lever movable along a lever path and configured to control a system of the aircraft, and a selectively engageable detent feature configured to inhibit travel of the control lever and operable in a disengaged configuration in which the control lever is movable along the lever path without restriction by the selectively engageable detent feature, and an engaged configuration in which the selectively engageable detent feature inhibits travel of the control lever at a particular location along the lever path.

Abstract: A transport system includes a mover, a stator, and a control unit. The mover moves in a first direction. The stator includes a plurality of coils arranged in the first direction and applies force to transport the mover in the first direction while using the plurality of coils, to which current is applied, to levitate the mover in a second direction intersecting the first direction. The control unit controls the current applied to the plurality of coils to control operation of the mover. The control unit controls the current applied to the plurality of coils using machine difference information of the mover to control an attitude of the mover while the mover is being levitated.

Abstract: A garage door status monitoring and control system includes a motor operable to move a garage door to alternate garage door positions, an encoder associated with the motor and configured to generate a pulse stream comprising motor signal pulses indicative of movement of the motor, a door control module with a first microprocessor operatively coupled to the encoder via a first path and configured to receive the pulse stream, and a garage door operator having a door controller with a second microprocessor operatively coupled to the encoder via a second path and configured to receive the pulse stream from the encoder independent of the door control module. The first microprocessor is configured to generate a digital door status indicative of one of the alternate garage door positions in response to the pulse stream. The garage door operator provides supervisory control over movement of the motor based upon the pulse stream.

Abstract: A stand-alone motor unit for use with a piece of power equipment includes a housing and a flange coupled to the housing on a first side thereof. A plurality of apertures through the flange defines a first bolt pattern that matches an identical, second bolt pattern defined in the piece of power equipment. An electric motor has a power output of at least about 2760 W. The motor includes a stator having a nominal outer diameter of up to about 80 mm and a rotor supported for rotation within the stator. A power take-off shaft receives torque from the rotor and protrudes from one of the flange or a second side of the housing. A controller is positioned within the housing and electrically connected to the motor. A battery pack for powering the motor has battery cells having a nominal voltage of up to about 80 V.

Abstract: A computer-assisted device includes an articulated arm configured to support an end effector and a control unit. When coupled to the articulated arm and a table, the control unit is configured to detect movement of the articulated arm caused by movement of the table, determine a movement of the table based on motion data received from the table, and drive one or more first joints of the articulated arm based on the movement of the articulated arm and the determined movement of the table.

Abstract: A motor control device capable of improving damping effects of a motor. In a motor control device, a control switching determination unit determines whether or not a control region of a motor is in a voltage saturation region. A voltage command value generator generates a voltage command value of the motor based on a velocity command value and a velocity of the motor. When the control switching determination unit determines that the control region of the motor is in the voltage saturation region, the voltage command value generator determines a voltage vector angle of an output voltage applied to the motor from a total torque command value and a limit value of the maximum voltage capable of being output to the motor, and generates a voltage command value based on the voltage vector angle.

Abstract: A motor control system includes an inverter and a control calculation unit. The control calculation unit includes a voltage control calculation unit that calculates a voltage command value indicating a voltage to be applied to a motor from the inverter on the basis of a current deviation between the current command value and the actual current detection value, and a compensation calculation unit that compensates at least one of a k-th component and a 1/k-th component in the motor with respect to a signal value on at least one of an upstream side and a downstream side in a signal flow that passes through the voltage control calculation unit. The compensation calculation unit calculates a compensation value on the basis of an actual angular velocity value indicating an angular velocity at which the motor rotates and the target current command value, while also taking into account advance angle control.

Abstract: Disclosed is a displacement correction apparatus. The apparatus comprises: a reference circuit and a correction circuit; the reference circuit is configured to provide a reference signal; the correction circuit is configured to perform a logarithm operation on a nonlinear displacement signal to be corrected based on the reference signal, to obtain a corrected linear displacement signal. The displacement correction apparatus can solve the problem of poor detection accuracy resulting from a position signal output by an eddy current sensor being not in a linear relationship with a displacement signal of a shaft, thereby achieving the effect of improving detection accuracy. A magnetic levitation bearing system and a displacement correction method therefor which use the above displacement correction apparatus are also disclosed.

Abstract: A computer-implemented method includes generating a joint-torque-limit model for the articulated arm based on allowable joint torque sets corresponding to a base pose of the base. The method also include receiving a first requested joint torque set for a first arm pose of the articulated arm and determining, using the joint-torque-limit model, an optimized joint torque set corresponding to the first requested joint torque set. The method also includes receiving a second requested joint torque set for a second arm pose of the articulated arm and generating an adjusted joint torque set by adjusting the second requested joint torque set based on the optimized joint torque set. The method also includes sending the adjusted joint torque set to the articulated arm.

Abstract: A motion control method is provided. The motion control method comprises: obtaining a sequence of motion parameters of a joint; interpolating the sequence of motion parameters to obtain an interpolation parameter sequence; and calculating driving parameters of a motion component based on the interpolation parameter sequence to drive the motion component to move. According to the motion control method, only a few of motion parameters need to be set by a user, and a lot of motion parameters can be obtained by interpolation, which make it possible for a motor or a robot to achieve smooth operation while a workload for the user is kept to be lower. A motion control device, system, and storage medium are also provided.

Abstract: Provided is a technique capable of suitably determining screw fastening failure. A screw fastening failure determination device (10) includes: a speed acquisition unit (13) which acquires an axial speed of a screw driver or a speed feature value relating to the speed; and a failure determination unit (14) which determines, in a temporary seating process, that a screw fastening has failed on the basis of the axial speed or the speed feature value at a prescribed timing.

Abstract: Disclosed herein is a motor driver circuit including a first output terminal to be connected to a first end of a to-be-driven motor via a sense resistor, a second output terminal to be connected to a second end of the motor, an error detector that generates an error signal, an A/D converter that obtains a digital signal, a compensator that generates a voltage command value, a D/A converter that converts the voltage command value to an analog control signal, a pulse width modulator that generates a first pulse and a second pulse, and an output stage that generates a first driving voltage and a second driving voltage. During a first mode, the compensator uses the error signal obtained by the A/D converter at a negative edge timing of the first pulse, for the error signal at a positive edge timing of the second pulse.

Abstract: A system and method for manufacturing a component is provided that includes a CNC machine tool, a correction module, and a system controller. The CMM module is controllable to determine a set of multi-axis coordinates surface points on the component. The correction module is in communication with the CMM module and stored reference inspection data. The system controller is in communication with the CNC machine tool, the correction module, and stored instructions. The instructions when executed cause the system controller to: a) control the CNC machine tool to modify a surface of the component; b) control the CMM module to determine multi-axis coordinates for surface points; c) determine surface position variances using the reference inspection data and the multi-axis coordinates; d) determine if surface position variances exceed a threshold; and e) create correction action instructions for controlling the CNC machine if surface position variances exceed the threshold.

Abstract: A joint unit that is reduced in size including a plurality of angle detection mechanisms. A joint unit including an input-side support member for a rotationally driven input shaft, a decelerator that decelerates the input shaft to provide a deceleration output shaft, an output rotating body coupled to the deceleration output shaft including a strain generating portion that generates strain due to rotation transmitted by the deceleration output shaft, and an associated rotating body that is coupled to a output-side portion of the strain generating portion of the output rotating body to rotate together with the output rotating body disposed in a space between the input-side support member and an input-side portion of the strain generating portion of the output rotating body.

Abstract: Disclosed is a method for control loop performance monitoring in a variable frequency drive. A set of data is inputted to one or more control loop performance monitoring algorithms comprised in the variable frequency drive, wherein the set of data comprises at least a measured value of a process variable, a target value for the process variable, a set of controller input parameters, and a controller output. An output from each of the one or more control loop performance monitoring algorithms is obtained based at least partly on the set of data. One or more key performance indicator values indicative of control loop performance are determined based at least partly on the output from each of the one or more control loop performance monitoring algorithms. The set of controller input parameters is adjusted based at least partly on the one or more key performance indicator values.

Abstract: A method includes driving a selected motor winding to be in a tri-state during a time interval having a finite time length value of a time window, sensing a zero-crossing (ZC) of an oscillating back electromotive force induced in the motor winding during the time window in which the motor winding is in the tri-state, and producing a ZC sensing signal, which has a first edge at a first time instant at the sensed ZC and a second edge at a second time instant separated from the first time instant by a half oscillation of the oscillating back electromotive force, detecting a phase of a current flowing in the motor winding at a time instant time-shifted with respect to the second time instant of the second edge of the ZC sensing signal, and adjusting the finite time length value based on the detected phase of the current.

Abstract: An apparatus for transferring an optical instrument, includes: a transferring block, wherein the optical instrument is coupled to a front surface thereof; a fixed block disposed at a rear side of the transferring block and coupled to a granite surface plate; a wedge stage module disposed on the fixed block to move the transferring block in a vertical direction; a vertical guide disposed at a side end of the transferring block to guide the transferring block in the vertical direction; and a horizontal stage module connected between the wedge stage module and the transferring block to guide a movement in a horizontal direction.

Abstract: A manipulation device and a manipulation system of a simpler configuration. A manipulation device includes an input part configured to receive an input of an operational instruction by an operator in order to operate a manipulating target, and a speaker configured to receive a signal based on vibration detected at the manipulating target and generate vibration based on the received signal. The vibration generated by the speaker is transmitted to the operator through at least a part of the input part.

Abstract: The programmable rocking bed includes a mattress support box, a plurality of jacks, a base box frame, a mattress, a headboard, a footboard, a controller, a plurality of light strips, and one or more sound systems. The mattress support box may be position agile via the activation of the plurality of jacks. The plurality of jacks may be operable to create a static or dynamic repositioning of the mattress support box.

Abstract: A drive system (500) includes a power converter (510) with power modules (312) supplying power to one or more output phases (A, B, C), a central control system (512) in communication with the power converter (510) and controlling operation of the power modules (312), wherein the central control system (512) comprises an advanced protection module (APM 514) configured via executable instructions to receive input data from an electrical load (520) operably coupled to the one or more output phases (A, B, C) utilizing power converter feedback from the electrical load (520), determine one or more operating conditions of the electrical load (520) based on the input data; and output one or more protection parameters based on a determined operating condition of the electrical load (520) for protecting the electrical load (520).

Abstract: A current sensing circuit includes a filtering circuit, an amplifier, a first resistor, a first transistor and a second transistor. The filtering circuit is coupled to two terminals of a sensing resistor. The amplifier has a first input terminal, a second input terminal and an output terminal. The second input terminal is coupled to the filtering circuit. The first resistor is coupled between the filtering circuit and the first input terminal of amplifier. A control terminal of the first transistor is coupled to the output terminal of amplifier, and its first terminal is coupled to the first input terminal of amplifier and its second terminal is grounded through a second resistor. A control terminal of the second transistor is coupled to the output terminal of amplifier, and its first terminal is coupled to the second input terminal of amplifier and its second terminal is grounded through a third resistor.

Abstract: To provide a controller for AC rotary electric machine and an electric power steering apparatus which can superimposes a cancellation current for canceling the torque ripple component on the winding current in feedforward manner and cancel the torque ripple component. A controller for AC rotary electric machine calculates an oscillation voltage command value of q-axis which has the same frequency as the torque ripple component; calculates a reverse phase of the torque ripple component based on the current information and the magnetic pole position; calculates a correction phase corresponding to the phase delay of the actual current with respect to the oscillation voltage command value of q-axis; and sets a phase of the oscillation voltage command value of q-axis to a phase obtained by advancing the reverse phase of the torque ripple component by the correction phase.

Abstract: System and methods for characterizing a response of a structure-under-test to applied excitation forces using a test fixture. The fixture is selectively coupleable to the structure-under-test and is configured to hold the structure-under-test at a known position and in a known orientation relative to the fixture. A plurality of excitation devices and response sensors are coupled to the fixture. Excitation forces applied to the fixture by the excitation devices are conveyed by the fixture to the structure-under-test and each response sensor measures a dynamic response indicative of a response of the structure-under-test and the fixture to the applied excitation force. A controller receives response sensor data and applies a mathematical coordinate transformation to project the forces and moments corresponding to the applied excitation and the measured dynamic responses to a target point of the structure-under-test and to calculate a system response function based at least in part on the projection.

Abstract: Control commands for a control device of a machine define a sequence of successive sections of ideal position target values for a position-controlled shaft of the machine. The ideal position target values either increase or decrease monotonically within the sections, but the direction of the monotony changes from section to section. A position controller determines actuating signals for an actuator from position target values resulting from ideal position target values, additional target values and position actual values. Within sections, the additional target values are positive (negative) when the ideal position target values increase (decrease) monotonically. The additional target values have a first component dependent exclusively on a position difference, with the magnitude of the first component increasing as the magnitude of the position difference increases, first strictly monotonically and then at least monotonically.

Abstract: A friction compensation device of the present disclosure includes a drive torque calculation unit that calculates output torque of a transmission mechanism from a motor's position, velocity, and acceleration, the transmission mechanism being connected to a motor via a shaft to transmit the driving force of the motor, and a friction estimate value calculation unit that calculates a friction estimate value that is an estimate value of a friction force on the shaft. The friction estimate value calculation unit includes a friction correction value calculation unit that calculates a friction correction value to correct the friction force on the shaft, in accordance with the output of the drive torque calculation unit.

Abstract: A cutting machine having a work surface, configured to accommodate at least one object to be cut, a working group, which is movable above the work surface including a receptacle device for accommodating a replaceable cutting tool, and a processing unit for controlling the cutting machine and storage capacity for providing a database, characterized by a first sensor unit, which is designed to detect individual items of identification information of the cutting tool and to provide detected items of identification information to the processing unit, wherein the processing unit is designed to recognize the cutting tool based on the items of identification information, to detect operating data of the cutting tool and store these data in the database, wherein the operating data comprise at least one operating time of the cutting tool, and to carry out operational monitoring of the cutting tool based on the operating data.

Abstract: A medical manipulator according to one or more embodiments may include: a first manipulator arm with multi-degree of freedom that holds a medical tool at a distal end portion thereof; a second manipulator arm with multi-degree of freedom that holds a medical tool at a distal end portion thereof; an arm base that holds base end portions of the first and second manipulator arms; a movement mechanism configured to move the base end portion of the first manipulator arm with respect to the arm base to change a distance between the base end portion of the first manipulator arm and the base end portion of the second manipulator arm; and a positioner configured to move the arm base and position the arm base in place.

Abstract: A metrology device with automated compensation and/or alert for orientation errors. The device may include a processor, a probe portion and at least one orientation sensor. The probe provides an output representative of a raw measurement of a characteristic of a device under test and the orientation sensor provides a sensor output representative of an orientation of the metrology device to the device under test. The processor applies a correction factor to the raw measurement in response to the sensor output to establish a compensated measurement to compensate for misalignment of the metrology device to the device under test. In addition, or alternatively, the processor provides an alert indicating the existence and/or extent of the misalignment.

Abstract: A parameter setting method includes a parameter value changing step of, when the magnitude of a deviation that is a difference between a command position and an actual position of a movable portion is greater than or equal to a prescribed value during operation of an active damper, selecting an unselected set of candidate values from among a plurality of sets of candidate values and changing the values of respective types of parameters of the active damper to the selected set of candidate values, and when the magnitude of the deviation is less than the prescribed value, not changing the values of the respective types of the parameters. After the parameter value changing step is finished, the parameter value changing step is repeated until the magnitude of the deviation becomes less than the prescribed value.

Abstract: A process for monitoring backlash in a gear of a joint of an industrial robot, wherein said joint includes a first joint body and a second joint body coupled together with the possibility of moving with respect to one other, a motor provided with an encoder, and a motion-transmission assembly designed to transmit the torque generated by said motor to said second joint body to bring about a movement of said second joint body with respect to said first joint body, said transmission assembly comprising said gear. The process is characterized in that the signal of the encoder of the motor for driving the joint is used without providing any additional sensor specifically dedicated to monitoring of the backlash.

Abstract: A milling machine may have a frame, ground engaging tracks that support the frame, and an actuator that adjusts a height of the frame relative to the track. The milling machine may have a control valve that selectively controls a flow of fluid into or out of the actuator based on the current supplied to the control valve. The milling machine may have a controller that determines the amount of current required to operate the actuator at a nominal actuator velocity and supplies that current to the control valve. The controller determines a measured actuator velocity based on a time required to extend or retract the actuator by a predetermined length, and adjusts the amount of current based on the measured and nominal actuator velocities. The controller also supplies the adjusted amount of current to the control valve to adjust the height of the frame relative to the track.

Abstract: A motor drive device includes: a position command generator which generates a position command; a damping filter unit which includes one or more stages of damping filters which reduce vibration of a device including a load and a motor, applies, to a position command, a damping filter determined based on a model parameter corresponding to a model of the device, and outputs a filtered position command to which the damping filter has been applied; a servo controller which gives a torque command to the motor based on the filtered position command; a low-pass filter unit; a parameter estimation unit which estimates the model parameter from the rotational speed and the torque command of the motor which have passed through the low-pass filter unit; and a vibration determination unit which determines presence or absence of vibration in the model.

Abstract: A method and an apparatus are described for monitoring the wear of a long stator linear motor system comprising at least one motor train with stators and at least one transport vehicle that is driven electromagnetically thereby. Due to the fact that a force exerted electromagnetically and/or mechanically upon said motor train by the transport vehicle transverse to the latter's direction of transport or a differential force exerted in such manner by the transport vehicle upon two oppositely disposed motor trains is measured using sensors, changes in the forces between the motor train and the vehicle caused by dimensional tolerances and/or wear can be detected in order to prevent a malfunction of the track switch.

Abstract: Provided is a substrate transferring method which is capable of accurately mounting a substrate at a desired rotation angle. In order to eliminate a misalignment of a wafer W in a rotational direction in a vacuum process chamber, which is caused by a variation in a transfer distance of the wafer W, the wafer W is mounted on a stage while being offset from the center of the stage in a load lock chamber and an angle of rotation of the wafer W with respect to a fork when a transfer arm receives the wafer W is changed.

Abstract: System for controlling at least one active magnetic bearing equipping a rotating machine comprising a rotor and a stator, at least one means for measuring the radial positions of the rotor as a function of the signal from at least one position sensor, and at least two control loops of the active magnetic bearing as a function of the radial positions of the rotor, each control loop of the magnetic bearing being provided with at least one synchronous filter as a function of the rotation speed, and an extended Kalman filter for determining the rotation speed of the rotor with respect to the stator receiving as input, from position sensors, measurements of radial position of the rotor and as a function of measurements of radial position of the rotor performed over a predetermined time at zero rotor rotation speed.

Abstract: A calibration method includes the steps of placing a structure to be measured at a first position, measuring a first distance from a laser interferometer to a reflector, and measuring first coordinates of a body to be measured, moving the structure to be measured to a second position, measuring a second distance from the laser interferometer to the reflector and measuring second coordinates of the structure to be measured with the coordinate measuring apparats, while the structure to be measured is at the second position, determining a scale error of the reference instrument, mounting the reference instrument, measuring the interval between objects to be measured, and calculating a calibration value of the interval between the objects to be measured.

Abstract: A method and device of determining a fault condition in a synchronous motor including a rotor provided with damper bars and an end ring to which the damper bars are mechanically connected thereby forming a damper cage, wherein the method includes: obtaining a first measurement of an end ring current from a first location along the end ring, processing the first measurement to thereby obtain a processing result, and determining whether a fault condition is present in the synchronous motor based on the processing result.

Abstract: According to one embodiment, a magnetic disk device includes a first disk, a second disk, a first head, a second head, a first actuator including the first head, a second actuator including the second head, a first arithmetic unit executing a first reordering process of a command stored in a first queue corresponding to the first actuator, and a second arithmetic unit executing a second reordering process of a command stored in a second queue corresponding to the second actuator, the first arithmetic unit executing the second reordering process, the second arithmetic unit executing the first reordering process.

Abstract: The disclosure is a rotation center measurement method of a multi-axis processing machine which relatively moves tables on which a work piece is placed and a tool for processing the work piece by control of rotation axes based on a processing program, and the rotation center measurement method is characterized to include: a processing program acquisition step in which the processing program is acquired; a processing program analysis step in which command angles of tool postures are read from the processing program and analyzed, and measurement angles are calculated based on the analysis results; and a geometric deviation measurement step in which a reference sphere is placed on the tables and the tables and the tool are relatively moved to measure a position of the reference sphere, and directions and positions of rotation centers of the rotation axes are calculated.

Abstract: A coupling device (16, 116, 216, 316) configured optimally to communicate between a first and a second admittance controller and actuator assembly, the first and the second admittance control and actuator assembly respectively having a first and a second admittance controller (12a, 12b) configured to drive a respective first and a second actuator and each of the first and the second actuator being respectively connected to a first body having a first mass and a second body having a second mass, wherein the coupling device (16, 116, 216, 316) comprises: an input port having a first input for receiving a first input force signal (f1) from the first admittance controller and actuator assembly (12a) and a second input for receiving a second input force signal (f2) from the second admittance controller and actuator assembly (12b), and a processor adapted to derive a first output force signal for output to the first admittance controller and actuator assembly based on a Lagrange multiplier dependent on a comparison

Abstract: The disclosure discloses a linear oscillatory machine control method based on an adaptive full-order displacement observer.

Abstract: An estimating device estimating a rotary axis position of a workpiece includes first and second position acquisition units acquiring tool positions in first and second directions, a load acquisition unit acquiring first and second directional loads of the tool in the first and second directions, a determination unit determining whether or not the first and second directional loads each are a threshold or less, a turning control unit performing a lathe turning on the workpiece until the first directional load becomes the threshold or less and thereafter performing a lathe turning thereon until the second directional load becomes the threshold or less, and an estimating unit estimating the rotary axis position based on a first directional position of the tool when the first directional load has become the threshold or less, and a second directional position thereof when the second directional load has become the threshold or less.

Abstract: A resolver system includes a rotatable primary winding, a secondary winding fixed relative to the primary winding, and an analog-to-digital converter electrically connected to the secondary winding. A control module is operatively connected to analog-to-digital converter and is responsive to instructions to apply an excitation voltage with an oscillating waveform to the primary winding, induce a secondary voltage using the secondary winding using the excitation voltage, and acquire a plurality of voltage measurements from the secondary winding separated by a time interval corresponding to ?/3 of the excitation voltage oscillating waveform.

Abstract: A method and system to prevent unexpected operation of a motor when the voltage level on a DC bus drops is disclosed. The voltage level on the DC bus is monitored during a run command. When a run is commanded, the processor executes a control routine to determine a desired amplitude and frequency for the output voltage required to control the motor connected to the motor drive. If the desired frequency of the output voltage exceeds a maximum frequency for the measured voltage on the DC bus, as established by parameters stored in the motor drive, the motor drive limits the output frequency to the maximum frequency for the corresponding measured voltage. The motor drive continually monitors the measured voltage present on the DC bus and further reduces the maximum output frequency allowed during the run if the present value of the measured voltage drops below a previously measured value.