Abstract: The purpose of the present invention is to provide a device monitoring technique having little restriction even on application to an already-existing device or facilitating monitoring even when a device to be monitored is in variable speed operation or under load variation. One of the representative device monitoring devices of the present invention monitors a device system using, as a power source, an AC electric motor driven by an inverter and is provided with a torque current estimation unit and a state estimation unit. The torque current estimation unit acquires information about AC currents of at least two phases and excitation current of the AC electric motor and calculates a torque current estimated value of the AC electric motor on the basis of the AC currents and the excitation current. The state estimation unit estimates the state of the device system from information including at least one of the feature amounts extracted from the torque current estimated value.

Abstract: Provided is a transmission device monitoring system including: a diagnostic frequency estimation unit that extracts a plurality of diagnostic frequency candidate groups from a frequency region separated by a specific frequency or more using at least current information on a motor, a gear ratio of a transmission device, and the number of stages of the transmission device, and estimates a frequency satisfying a specific relationship from frequencies obtained in the plurality of diagnostic frequency candidate groups as a diagnostic frequency; and an abnormality diagnosis unit that diagnoses abnormality of the transmission device using at least the one diagnostic frequency estimated by the diagnostic frequency estimation unit.

Abstract: An estimation management system stores a plurality of past estimations each including a proposed plan and a compared plan. The estimation management system accepts input of a trial calculation condition including a plurality of trial calculation condition items for a user to create a new estimation, and sets, as a value of an unentered item in the plurality of trial calculation condition items, a value of a trial calculation condition item of each of a plurality of estimations selected from the plurality of past estimations to make a trial calculation. The estimation management system generates a plurality of trial calculation results corresponding to the plurality of estimations, and evaluates the plurality of trial calculation results in terms of a total cost and a period required for superiority.

Abstract: A vertically alternating sequence of continuous insulating layers and continuous sacrificial material layers is formed over a substrate, and is patterned to form stepped surfaces. Memory stack structures are formed in a memory array region of the alternating stack. Support pillar structures are formed through the vertically alternating sequence within a staircase region. The support pillar structures are formed at lattice sites of a hexagonal lattice structure that includes unoccupied lattice sites. Portions of the continuous sacrificial material layers are replaced with electrically conductive layers. Contact via structures are formed on a respective one of the electrically conductive layers at the unoccupied lattice sites. Geometrical centers of the support pillar structures are arranged at vertices of a polygon having more than four vertices having a respective contact via structure located at a geometric center of the polygon in a plan view.

Abstract: A manufacturing system 10 is configured to include a driving device 4 configured to drive a manufacturing machine 5 in a step pertaining to product manufacture in a predetermined production management system, the driving device 4 driving the manufacturing machine 5 in the step in response to predetermined information obtained related to a state of the step.

Abstract: A vertically alternating sequence of continuous insulating layers and continuous sacrificial material layers is formed over a substrate, and is patterned to form stepped surfaces. Memory stack structures are formed in a memory array region of the alternating stack. Support pillar structures are formed through the vertically alternating sequence within a staircase region. The support pillar structures are formed at lattice sites of a hexagonal lattice structure that includes unoccupied lattice sites. Portions of the continuous sacrificial material layers are replaced with electrically conductive layers. Contact via structures are formed on a respective one of the electrically conductive layers at the unoccupied lattice sites. Geometrical centers of the support pillar structures are arranged at vertices of a polygon having more than four vertices having a respective contact via structure located at a geometric center of the polygon in a plan view.

Abstract: Memory openings and backside openings are formed through an alternating stack of insulating layers and sacrificial material layers with patterned stepped surfaces and an overlying retro-stepped dielectric material portion. The backside openings may be formed in rows with shape modifications in staircase regions to provide more lateral elongation in areas with lesser layers of the alternating stack. Non-circular horizontal cross-sectional shapes for the backside openings in the staircase regions allow formation of the backside opening with less shape distortion. Memory opening fill structures are formed in the memory openings, and the sacrificial material layers are replaced with electrically conductive layers using the backside openings as conduits for an etchant and for a deposition precursor material. The electrically conductive layers are isotropically recessed around each backside opening to form width-modulated cavities, which is filled with width-modulated insulating wall structures.

Abstract: Memory openings and backside openings are formed through an alternating stack of insulating layers and sacrificial material layers with patterned stepped surfaces and an overlying retro-stepped dielectric material portion. The backside openings may be formed in rows with shape modifications in staircase regions to provide more lateral elongation in areas with lesser layers of the alternating stack. Non-circular horizontal cross-sectional shapes for the backside openings in the staircase regions allow formation of the backside opening with less shape distortion. Memory opening fill structures are formed in the memory openings, and the sacrificial material layers are replaced with electrically conductive layers using the backside openings as conduits for an etchant and for a deposition precursor material. The electrically conductive layers are isotropically recessed around each backside opening to form width-modulated cavities, which is filled with width-modulated insulating wall structures.

Abstract: A manufacturing system 10 is configured to include a driving device 4 configured to drive a manufacturing machine 5 in a step pertaining to product manufacture in a predetermined production management system, the driving device 4 driving the manufacturing machine 5 in the step in response to predetermined information obtained related to a state of the step.

Abstract: In a system for driving an electric motor by an engine generator, there is a possibility that oscillation and d-axis current are increased. In an engine generator system, a power converter (105) controls a generator (104) so that the phase of an oscillating component included in the d-axis current in the rotor magnetic flux direction of the generator (104) advances by 90 degrees or more with respect to the phase of an oscillating component of the identical frequency included in the rotating electric angular frequency of the generator (104), and further using q-axis voltage adjusting device (118) so that the phase of an oscillating component included in the q-axis current advances by 90 degrees or more with respect to the phase of an oscillating component of the identical frequency included in the rotating electric angular frequency of the generator (104).

Abstract: In a system for driving an electric motor by an engine generator, there is a possibility that the effects of harmonics and DC voltage fluctuations of a power converter cause shaft oscillation to increase due to a phenomenon in which current pulsations caused by voltage disturbances at a d-axis and a q-axis are strengthened each other and thus oscillation and d-axis current are increased under the effect of interference between the d-axis and the q-axis.

Abstract: In a power conversion device that includes a PWM converting means for generating a PWM pulse by comparing three-phase voltage commands with a triangular wave carrier signal, a power converter for converting between a DC voltage and a three-phase AC voltage by driving a switching element according to the PWM pulse, a current detecting means for detecting a pulsed current flowing through a DC bus conductor of a main circuit, and a voltage command correcting means for correcting three-phase voltage commands, which corrects the three-phase voltage commands so that a line voltage value between the maximum phase and an intermediate phase and a line voltage value between the intermediate phase and the minimum phase are each equal to or larger than a predetermined value, the maximum phase, intermediate phase, and minimum phase being determined in correspondence to momentary values of the three-phase voltage commands arranged in descending order, if the voltage command is outside an allowable upper limit or lower limi

Abstract: An electric motor drive system having current detecting sections for detecting the currents flowing into electric motors, speed variation calculating sections for calculating the speed variation estimating values for the electric motors in accordance with the motor currents detected by the current detecting sections and the current command values for the motors corresponding to the detected currents and a speed uniformizing voltage compensating section for delivering the values that serve to compensate the amplitudes of the voltages applied to the electric motors in such a manner that the speed variation estimating values calculated by the speed variation calculating sections become equal to a predetermined value.

Abstract: In a power conversion device that includes a PWM converting means for generating a PWM pulse by comparing three-phase voltage commands with a triangular wave carrier signal, a power converter for converting between a DC voltage and a three-phase AC voltage by driving a switching element according to the PWM pulse, a current detecting means for detecting a pulsed current flowing through a DC bus conductor of a main circuit, and a voltage command correcting means for correcting three-phase voltage commands, which corrects the three-phase voltage commands so that a line voltage value between the maximum phase and an intermediate phase and a line voltage value between the intermediate phase and the minimum phase are each equal to or larger than a predetermined value, the maximum phase, intermediate phase, and minimum phase being determined in correspondence to momentary values of the three-phase voltage commands arranged in descending order, if the voltage command is outside an allowable upper limit or lower limi

Abstract: A slip frequency is estimated from a current instruction or detected currents in an induction motor. Acceleration impossibility in an induction motor drive unit is determined, when the slip frequency exceeds the maximum torque generating slip frequency for the predetermined interval or the time integrating result exceeds a predetermined value; when the q-axis magnetic flux exceeds the maximum torque generating q-axis magnetic flux or exceeds for a predetermined interval; when the estimated rotational speed is under a predetermined value; when the rotational speed variation rate is negative; and when the rotational speed instruction value or the estimated rotational speed is equal to or smaller than a predetermined value. An induction motor drive system and an elevating system including the induction motor drive unit are also disclosed.

Abstract: An electric power converter apparatus having a function of converting a power source voltage into an AC voltage having an arbitrary frequency and maintaining an output voltage constant even on the power source variation, in which the electric power converter apparatus decreases the output voltage when the output voltage drops to equal to or less than a predetermined value, afterward, increases the output voltage in response to a predetermined rate of change when the power source voltage rises.

Abstract: The present invention provides an induction motor controller which includes: a circuit for generating a d-axis current reference signal from a d-axis current command value and a periodically varying periodic signal; a d-axis current controller for controlling a d-axis motor current flowing through an induction motor to be controlled to match the d-axis current reference signal; parameter determining means for calculating and determining a motor parameter of the induction motor based on a deviation of the d-axis motor current from the d-axis current reference signal, and controlling a voltage applied to the induction motor using a compensation voltage calculated from the calculated and determined motor parameter, in which a control parameter for controlling the induction motor is set based on the calculated and determined motor parameter.

Abstract: An electric motor drive system having current detecting sections for detecting the currents flowing into electric motors, speed variation calculating sections for calculating the speed variation estimating values for the electric motors in accordance with the motor currents detected by the current detecting sections and the current command values for the motors corresponding to the detected currents and a speed uniformizing voltage compensating section for delivering the values that serve to compensate the amplitudes of the voltages applied to the electric motors in such a manner that the speed variation estimating values calculated by the speed variation calculating sections become equal to a predetermined value.

Abstract: An object of the present invention is to provide a driver for an induction motor which performs an operation at an acceleration suitable for the magnitude of a load and is excellent in efficiency, without an acceleration failure. The driver for an induction motor includes a slip frequency estimate value arithmetic operation section 15 for arithmetically operating a slip frequency ?s^ of an induction motor 12, and a maximum torque generation slip arithmetic operation section 16 for arithmetically operating a slip frequency ?smax at which a maximum torque is generated. When the slip frequency ?s^ exceeds a predetermined value ?smaxTH (=0.9 ?smax, etc.) corresponding to the slip frequency ?smax at which the maximum torque is generated, a speed change rate arithmetic operation section 17 and a speed change rate correcting section 18 reduce a rate of increase in a speed command ?r*.

Abstract: A slip frequency is estimated from a current instruction or detected currents in an induction motor. Acceleration impossibility in an induction motor drive unit is determined, when the slip frequency exceeds the maximum torque generating slip frequency for the predetermined interval or the time integrating result exceeds a predetermined value; when the q-axis magnetic flux exceeds the maximum torque generating q-axis magnetic flux or exceeds for a predetermined interval; when the estimated rotational speed is under a predetermined value; when the rotational speed variation rate is negative; and when the rotational speed instruction value or the estimated rotational speed is equal to or smaller than a predetermined value. An induction motor drive system and an elevating system including the induction motor drive unit are also disclosed.