Abstract: A reduced voltage soft starter (RVSS) includes a switching circuit configured to selectively couple an AC power source to a motor and a control circuit configured to sense a line voltage provided to the switching circuit to produce a first voltage signal, to sense a current of the motor to generate a current signal and to generate a second voltage signal representative of a voltage of the motor responsive to the first voltage signal and the current signal. The control circuit may be further configured to generate an estimate of a torque of the motor responsive to the second voltage signal and to control the torque of the motor responsive to the torque estimate.

Abstract: An elevator monitoring device that can compensate for system voltage when an unbalanced short circuit occurs. A control device for a power conversion device includes: a current command value generator configured to generate a provisional normal phase d-axis current command value, a provisional normal phase q-axis current command value, a provisional reversed phase d-axis current command value, and a provisional reversed phase q-axis current command value to compensate for an alternating current (AC)-side voltage of a power converter; a limiter configured to respectively set limit values of a provisional normal phase d-axis current command value, a provisional normal phase q-axis current command value, a provisional reversed phase d-axis current command value, and a provisional reversed phase q-axis current command value so that the AC-side current value of the power converter does not exceed a preset value; and a controller configured to control the power converter within the limit values.

Abstract: Systems and methods are provided to evaluate moving objects undergoing periodic motion through the screening of a video recording of such objects in motion for frequency peaks in the spectral data, and to determine spatially where these frequencies occur in the scene depicted in the video recording, wherein a frequency spectrum is created for a subset of pixels or virtual pixels and a composite frequency spectrum table or graph is constructed of frequencies that are selected from among the larger group of frequencies represented by the frequency peaks of the spectral data.

Abstract: Systems and methods for sensorless trapezoidal control of brushless DC motors provide effective high-torque startup and low speed operation without the use of Hall effect sensors or encoders during motor operation. The systems and methods also provide the ability to boost signal-to-noise ratio for motor startup and low speed operation via an augmenting supply voltage. Sampling architectures and current-dependent inductance modeling architectures for the control systems are also described.

Abstract: A motion control system includes a top mount, a bottom mount, a rigid housing, an air spring, and a linear actuator. The air spring transfers force of a first load path between the top mount and the bottom mount. The air spring includes a pressurized cavity containing pressurized gas that transfers the force of the first load path. The linear actuator transfers force of a second load path between the top mount and the bottom mount in parallel to the first load path. The rigid housing defines at least part of the pressurized cavity and transfers the force of the second load path.

Abstract: Provided is a method of estimating a rotor operational parameter of an electrical machine including multiple winding sets wound to have a phase-shift between winding sets, the rotor operational parameter including rotor position and/or rotor speed, the method including: deriving, for each winding set, a preliminary rotor operational parameter based on a current and a voltage of the respective winding set; calculating for at least two winding sets and for at least one predefined harmonic, a rotor operational parameter harmonic correction term based on the preliminary rotor operational parameter of at least two winding sets; calculating for at least one winding set, a corrected rotor operational parameter based on the preliminary operational parameter of this winding set and the rotor operational parameter harmonic correction term of this winding set, wherein in particular the corrected rotor operational parameter has at least one predefined harmonic removed or at least attenuated.

Abstract: A motor controller estimates an initial position of a magnetic pole of a rotor of a brushless DC motor in an inductive sensing scheme. The motor controller controls a drive circuit to apply an AC voltage to a stator winding at a first energization angle, and subsequently to apply an AC voltage to the stator winding at a second energization angle before a residual current flowing through the stator winding returns to zero. At each energization angle, the motor controller corrects a peak value of a current in the stator winding based on the residual current detected immediately before a voltage is applied to the stator winding or at a time when voltage application to the stator winding is started. Based on the corrected peak value, the control circuit estimates the initial position of the magnetic pole of the rotor.

Abstract: There is provided an electric-power conversion system controller in which even when the temperatures of a switching device and a diode included in the driving circuit for a converter become high, the performances of the devices are prevented from being deteriorated and the lifetimes thereof are prevented from being shortened.

Abstract: A system may include an inverter configured to convert a direct current (DC) voltage to an alternating current (AC) voltage. The system may also include a control system communicatively coupled to the inverter. The control system may receive a torque current feedback from a motor and may generate, based on the torque current feedback, a command torque current and a command flux current. The control system may generate, based on the command torque current and the command flux current, a command torque voltage and a command flux voltage and may generate, based on a slip frequency and a rotor frequency, a command frequency. The control system may determine one or more operating parameters for the inverter based on the command frequency, the command torque voltage, and the command flux voltage and may control the inverter based on the one or more operating parameters.

Abstract: Embodiments of the disclosure are directed at determining rotor deterioration in a dynamoelectric machine. Various current and voltage measurements are carried out upon an exciter assembly when the dynamoelectric machine is operated at various speeds and at various occasions over an extended period of time. More particularly, a set of current and voltage measurements that are carried out when the dynamoelectric machine is in a slow-roll mode of operation can be used for determining a resistance of a current path through which the exciter assembly provides electrical power to a rotor assembly. A time-domain-to-frequency-domain conversion can be carried out upon this set of resistance measurements in order to generate a spectral signature. The spectral signature can then be evaluated to detect an altered rotor resistance condition and/or a rotor resistance alteration trend.

Abstract: A motor drive includes a rectifier bridge for connection with mains, a converter bridge configured to connect with an elevator motor and an intermediate DC circuit in-between. A capacitor and/or battery is connected between positive and negative branches of the intermediate DC circuit. At the mains side of the rectifier bridge a controlled main relay with contacts are configured to connect or disconnect the rectifier bridge with the corresponding mains phase. The motor drive comprises a charging circuit which comprises a charging switch connected with a current limiting component. The motor drive comprises a voltage sensor between positive and negative branches of the intermediate DC circuit. The voltage sensor is connected to a circuit comprising a reference value and a comparator. The evaluation circuit is configured to compare the actual sensor signal of the voltage sensor to the reference value and to operate the main relay based on the comparison.

Abstract: A voltage detecting circuit includes a rectifying circuit, a voltage dividing circuit, and a comparing circuit. The rectifying circuit is configured to rectify a plurality of AC phase voltages to output a plurality of rectified voltages respectively. The voltage dividing circuit is configured to divide the plurality of rectified voltages respectively to output a plurality of sampling voltages. The comparing circuit is configured to compare the plurality of sampling voltages with a reference voltage respectively to provide a plurality of corresponding phase failure detecting voltages. On the condition that the AC phase voltages are unbalanced, the phase failure detecting voltage switches between a high level and a low level.

Abstract: A magnetic field communication system and method is devised for communicating a signal indicating an internal state of a bearing through a magnetic field and for converting the signal communicating through the magnetic field into power to analyze the internal state of the bearing. The system includes a sensor unit disposed inside a bearing and an adapter disposed outside the bearing. The sensor unit includes a sensor to detect a temperature of oil inside the bearing and to output a sensing signal indicative of the detected oil temperature, and an interface to convert the outputted sensing signal into a magnetic field signal and to transmit the magnetic field signal outside the bearing. The adapter receives the transmitted magnetic field signal from the sensor unit and analyzes the received magnetic field signal in order to determine a status of the oil temperature.

Abstract: In the field of multi-terminal electrical power network protection, a protection apparatus comprises a measurement apparatus to measure the respective terminal current (IL, IR1, IR2, IR3, IR4, IR5) flowing at each terminal (L, R1, R2, R3, R4, R5) in a multi-terminal network that includes a plurality of electrically interconnected terminals (L, R1, R2, R3, R4, R5). The protection apparatus also includes a control unit that is programmed to process the measured terminal currents (IL, IR1, IR2, IR3, IR4, IR5) to obtain first and second summed values (IPOS(n), INEG(n)).

Abstract: An information related to the position of an actuator coupled to a cable which is coupled to a motor is received. A filter is used to provide an input to a motor controller coupled to the motor, to adjust torque on the motor such that a strength curve is implemented relative to the position of the actuator.

Abstract: A network subscriber unit for an electrical energy supply network includes a control unit configured to control the power exchange of the network subscriber unit with the energy supply network, a device configured to determine a voltage zero crossing at a connection point of the network subscriber unit with the energy supply network and a receiving unit of the network subscriber unit configured to receive a signal of a reference time. The control unit is in this case configured to determine a time offset between a time of the voltage zero crossing determined by the device and the received reference time and to control the power exchange based on the time offset.

Abstract: Controls for chillers with variable speed and variable geometry compressors are disclosed. In exemplary embodiments, a centrifugal compressor equipped with a variable frequency drive and variable inlet guide vanes may be utilized. A controller is operable to determine a chiller capacity command, a speed command, and a vane position command. The speed command and vane position command may maintain system operation at or near a surge control boundary over one or more capacity ranges to enhance efficiency and deviate from the surge control boundary over certain capacity ranges to improve controllability or avoid control aberrations.

Abstract: A computer-implemented method for prognostic network management may include (1) monitoring a health indicator of a physical component of a device in a network, (2) using the health indicator to estimate a remaining useful life of the physical component, (3) detecting that the remaining useful life of the physical component has reached a predetermined threshold, and (4) reconfiguring the network in response to detecting that the remaining useful life of the physical component has reached the predetermined threshold so that failure of the physical component does not cause the network to become unavailable to any user of the network. Various other methods, systems, and computer-readable media are also disclosed.

Abstract: Apparatus and methods of identifying rock properties in real-time during drilling, are provided. An apparatus includes an acoustic sensor installed in a drilling fluid circulation system of a drilling rig, the acoustic sensor coupled to one of the following: (i) a bell nipple, (ii) a gooseneck, or (iii) a standpipe. Raw acoustic sensor data generated real-time as a result of rotational contact of the drill bit with rock during drilling is received, and a plurality of acoustic characteristics are derived from the raw acoustic sensor data. The lithology type of rock undergoing drilling may be determined from the acoustic characteristics. Petrophysical properties of the rock undergoing drilling may be determined using a petrophysical properties evaluation algorithm employable to predict the petrophysical properties of rock undergoing drilling from the raw acoustic sensor data.

Abstract: In a method and a corresponding device for detecting phase failures in a converter, current regulators of a positive phase sequence system and current regulators of a negative phase sequence system are provided for the current control of the converter, wherein the current regulators of the positive phase sequence system and the current regulators of the negative phase sequence system each have an integrator, resulting, in the case of a network fault, in coupling of the integrators. At least one measured or calculated value is checked by a monitoring unit for a course that is typical of the coupling of the integrators, wherein the monitoring unit generates a fault signal if such a typical course is detected.

Abstract: Described herein is a neural network-based vector control method for the induction motor. The disclosure includes an approach to implement optimal vector control for an induction motor by using an NN; a NN controller to substitute two decoupled proportional-integral (PI) controllers in current loop; and, a mechanism to train the NN controller by using a Levenberg-Marquardt (LM)+forward accumulation through time (FATT) algorithm.

Abstract: Provided is an electric machine health monitoring system that includes an electric machine, a data acquisition component, a local transmitter, a communications network, and a remote diagnostic unit that is configured to receive the time sequenced operational information, asset performance, and health status indicators from a local transmitter. The remote computational unit comprises software that is configured to perform diagnostic analysis of time sequenced operational information to determine the asset performance and health status of the electric machines.

Abstract: A motorized assist apparatus provides an assist force to user moved weight of a weight training or rehabilitation/therapy exercise machine or stand and includes an assist force delivery assembly with operably connected motor and reel, a flexible assist member on the reel to transmit force from the assembly to a primary load interface (PLI). A main digital controller controls operation of the assembly and a human-machine interface (HMI) accepts input of variable parameters for assist control. In some examples, the PLI is a harness to support a rehabbing person. In some examples, the motor can be a DC servo motor or an AC induction motor. In some examples, the assist assembly has two or more motors connected to drive the reel.

Abstract: In an embodiment, a data processing method comprises storing one or more generic machine operating definitions, wherein each of the generic machine operating definitions describes expected operational behavior of one or more types of machines during one or more operating states; analyzing operating data that describes past operation of a plurality of machines of a plurality of types; based at least in part on the operating data and the one or more generic machine operating definitions, generating and storing one or more machine operating models that describe expected operational behavior corresponding to a plurality of operating states of the plurality of machines; wherein the one or more machine operating models comprise a plurality of data patterns, wherein each of the data patterns is associated with a different set of one or more operating states of one or more machines; wherein the method is performed by one or more computing devices.

Abstract: An example system for controlling a grid-connected energy source using a neural network is described herein. The example system can include a grid-connected converter (“GCC”) operably coupled between an electrical grid and an energy source, a n-order grid filter (e.g., where n is an integer greater than or equal to 2) operably coupled between the electrical grid and the GCC, and a nested-loop controller. The nested-loop controller can have inner and outer control loops and can be operably coupled to the GCC. A d-axis loop can control real power, and a q-axis loop can control reactive power. Additionally, the inner control loop can include a neural network that is configured to optimize dq-control voltages for controlling the GCC. The neural network can account for circuit dynamics of the n-order grid filter while optimizing the dq-control voltages.

Abstract: Methods and systems for analysis of image data generated from various reference points. Particularly, the methods and systems provided are useful for real time analysis of image and sequence data generated during DNA sequencing methodologies.

Abstract: A machine learning device which learns a current command for a motor, the machine learning device including a state observation unit which observes a state variable including a motor rotation speed or a motor torque command of the motor and at least one of a motor torque, a motor current, and a motor voltage of the motor; and a learning unit which learns the current command for the motor based on the state variable.

Abstract: An exemplary system includes a compressor, a condenser, an expander, and an evaporator fluidly coupled to form a vapor-compression circuit, and an electric motor configured to drive the compressor. An inverter having a plurality of switching elements is configured to provide an output voltage to the electric motor through operation of the switching elements. A waste heat recovery circuit is configured to transfer waste heat from the inverter to a load. A controller is configured provide switching commands to the switching elements of the inverter. The controller is further configured to sense a condition of the system, determine a heat production requirement based at least in part upon the system condition, and to vary the number of switching commands per unit time based at least in part upon the heat production requirement.

Abstract: The control device of an induction motor includes a current command maximum value setting portion that sets an excitation current command maximum value and a torque current command maximum value. The current command maximum value setting portion changes, when the induction motor is accelerated/decelerated, the excitation current command maximum value based on which one of first and second excitation current command maximum values is lower, and changes the torque current command maximum value based on the excitation current command maximum value and an allowable maximum current value of a drive portion. The first excitation current command maximum value is based on the allowable maximum current value, and the second excitation current command maximum value is based on a power supply voltage of the drive portion, a current frequency of the drive current and an excitation inductance of the induction motor.

Abstract: The invention relates to a control device for an electric machine with a stator and a rotor, comprising a temperature detection device which is designed to detect the temperature of the stator and the temperature of the rotor, as well as a calculation device which is designed to adjust the operating point of said electric machine on the basis of a specified torque, the detected temperature of the stator, the detected temperature of the rotor, and a predefined thermal load distribution of said stator and rotor. The invention also relates to a vehicle and to a corresponding method for controlling an electric machine.

Abstract: The current embodiments provide a method for controlling an induction machine with a plurality of phases. Each phase may include a plurality of parallel windings and each phase may be associated with a half-bridge. The method may include determining a current in a winding of a first phase. The method may further include determining a phase current on the basis of the current in the winding, and controlling the half-bridge associated with the first phase based on the determined phase current.

Abstract: A method and an apparatus are disclosed to detect faults in a rotary machine having a rotor and at least two stator windings. The method comprises generating an input signal and applying the input signal to stator windings while the rotor is locked at a rotor position, measuring output signals from the stator windings and processing all the output signals by Fourier transform to obtain frequency responses of the stator windings, forming derived quantities from all the frequency responses so that the derived quantities are independent of the rotor position, comparing the derived quantities with corresponding reference quantities, determining that there is a fault in the rotary machine if a magnitude or phase difference between the derived quantities and the corresponding reference quantities exceeds a threshold number. The apparatus is designed to test a rotary machine using the inventive method.

Abstract: A method for controlling an asynchronous electrical motor, implemented in a processing unit associated with a power converter connected to the electrical motor, the method including an identification phase, which includes generating a speed trajectory in input of a control law of the motor in order to make the speed reference take several determined successive values, for each value taken by the speed reference, determining the voltage at the terminals of the electrical motor, for each value taken by the speed reference, determining and storing the flux value for which the voltage at the terminals of the electrical motor is equal to a determined threshold value.

Abstract: A power control apparatus includes the following elements. A measure measures a value of a current to be supplied from a power supply source to a load set. A switch is disposed on a power supply path from power supply source to a load set. A setter sets a first maximum current value in the case of a normal state in which the load set receives power from a main power supply source and sets a second maximum current value when the load set receives power from the sub power supply source. Control circuitry turns OFF the switch when the value of the measured current exceeds the first maximum current value in the case of the normal state and turns OFF the switch when the load set receives power from the sub power supply source and the value of the measured current exceeds the second maximum current value.

Abstract: An output driver circuit includes a control circuit and first and second transistor legs that are coupled to an output pad. Each of the first and second transistor legs includes a pull-up transistor and a pull-down transistor. The control circuit is coupled to the first and second transistor legs. The control circuit enables the first transistor leg to generate an output signal at the output pad and disables the second transistor leg during a first phase of a cycle. The control circuit enables the second transistor leg to generate the output signal at the output pad and disables the first transistor leg during a second phase of the cycle. The control circuit repeats the first and the second phases of the cycle.

Abstract: An electric motor system having substantially independent hardware-based and software-based pathways for detecting and initiating responses to fault conditions, such as over-current conditions, in an electric motor which is powered by a power inverter which is controlled by a power module and a microprocessor. Each pathway involves comparing a voltage, which is representative of an electric current flowing to the motor, to a predetermined maximum voltage, and if the former exceeds the latter using hardware or software to initiate shutting off the motor, such as by shutting off the power inverter. When one pathway detects a fault condition it may notify the other pathway, and the notified pathway may also initiate shutting off the motor.

Abstract: According to one embodiment, Switching units are configured to switch the intensity of X-rays to be generated by an anode. An X-ray controller controls the switching units to switch the intensity of the X-rays to be generated by the anode, and controls a rotor control power generator to rotate the anode. When a value approximately equal to an integer multiple of an X-ray intensity switching period designated by a user coincides with the rotor rotation period, the X-ray controller controls the rotor control power generator to shift the thermoelectron collision ranges of the anode in the first turn from thermoelectron collision ranges in the second turn.

Abstract: A method of monitoring a plurality of turbomachines is disclosed herein. In embodiments, the method includes a fleet data system receiving first event data from a first monitoring connection system and second event data from a second monitoring connection system. The method also includes the fleet data system determining from the first event data and the second event data whether an event has occurred. The method further includes the fleet data system issuing an alert when the fleet data system has determined that the event has occurred, the alert including an event name, an event status, and a timestamp related to when the event occurred.

Abstract: In a control apparatus, a target harmonic current obtainer obtains, according to a phase current flowing through at least one phase winding of a stator, a target harmonic current component flowing in a rotary machine. The target harmonic current component is included in a fundamental current component of the phase current. An inducing unit superimposes, on the phase information, a fluctuating signal that changes at an angular velocity identical to an angular velocity of the target harmonic current component, to induce a counteracting harmonic current component in the at least one phase winding. The counteracting harmonic current component counteracts the target harmonic current component.

Abstract: A circuit fault detection device includes: an interruption-signal generation unit that outputs an interruption signal for a drive circuit stopping driving of a drive target on a basis of the interruption signal; a pulse generation unit that includes an adjustment unit adjusting a time during which a pulse signal is in an OFF state and that generates the pulse signal; a signal synthesis unit that outputs a logical AND of the interruption signal and the pulse signal; a filter circuit that inputs, as an output, a signal obtained by delaying an output signal of the signal synthesis unit to the drive circuit; and a monitoring unit that determines whether a circuit fault has occurred on a basis of an output voltage of the filter circuit.

Abstract: A control apparatus for an AC motor includes a current sensor and an estimation section. The current sensor detects current flowing through one phase of the motor. The estimation section repeats an estimation process. In the estimation process, d-axis and q-axis current estimation values are calculated based on the presently detected current of the one phase and a previous current estimation value of another phase of the motor, and a present current estimation value of each phase is calculated based on smoothed values of the d-axis and q-axis current estimation values. The estimation section performs the estimation process based on a phase lag element. The phase lag element is a difference between the presently detected current and a previous current estimation value of the one phase or the previously detected current.

Abstract: Provided is an air conditioner including: a heater control section (54) for carrying out duty control on a positive temperature coefficient (PTC) heater (55); and a current detecting section (53) for detecting a current value of the PTC heater (55). The PTC heater (55) starts to be driven at a predetermined duty ratio. When the current value detected by the current detecting section (53) takes a peak (P), a duty ratio increasing process of increasing the duty ratio of the PTC heater (55) by a predetermined amount is repeated until the duty ratio reaches to 100%.

Abstract: A control apparatus includes an electric current estimation unit to improve a responsiveness of an AC motor. The electric current estimation unit performs, at predetermined intervals, a dq conversion, a correction process, and an inverted dq conversion. The dq conversion calculates d/q axis electric current estimate values based on a detection value of a sensor phase from a sensor, and on an electric current estimate values of two phases of the AC motor other than the sensor phase from a previous cycle. The correction process corrects, during the dq conversion, the d/q axis electric current estimate values in an orthogonal direction that is orthogonal to a sensor phase axis. The inverted dq conversion calculates the electric current estimate values of the two phases other than the sensor phase based on the d/q axis electric current estimate values corrected by the correction process and smoothed by a low-pass filter process.

Abstract: A heat dissipating method for a light emitting diode is provided. The heat dissipating method includes following steps. Firstly, a circuit board with a light emitting diode formed on one side and a heat dissipating fan formed on the other side is provided. The heat dissipating fan is configured to dissipate heat for the light emitting diode. Secondly, a power source is provided for supplying power for the light emitting diode. Finally, a speed of the heat dissipating fan is adjusted according to an input power of the power source. A lighting device using the heat dissipating method is also provided.

Abstract: An immersion pump assembly includes an electric drive motor and a control device (14) for controlling the drive motor, which are configured for dipping into a liquid (18) to be conveyed. An external display device (26) and/or an external communications device are/is configured for arrangement outside the liquid (18) to be conveyed and are/is connected to the control device (14) for signal transmission.

Abstract: A solid state relay for controlling a three-phase AC motor running direction is provided, a driver module, power components module, phase sequence detection module, phase lack detection module, and automatic phase correction and phase lack protection logic module. The input of the phase sequence detection module is connected to the three-phase power supply, and the output is connected to the automatic phase correction and phase lack protection logic module, to provide phase sequence detection and a phase sequence signal to the automatic phase correction and phase lack protection logic module. The input of the phase lack detection module is connected to the three-phase power supply, and the output is connected to the automatic phase correction and phase lack protection logic module, to detect a lack of phase and provide the lacking phase signal to the automatic phase correction and phase lack protection logic module.

Abstract: In a rotating electrical machine, a conductive foil or conductive rubber is applied to the surface of insulation layer of a conductor series connection area or to the surface of insulation layer of a turn conductor of coils of rotating electrical machine winding, waveforms of grounding voltages of the individual turn conductor portions are measured through the medium of an electrostatic capacitance of the insulation layer of coil conductor series connection area or through the medium of the insulation layer of coil turn conductor, and a partial discharge is measured while measuring a voltage developing in the coil or across a winding turn in the coil from a difference between the waveforms of grounding voltages.

Abstract: The invention relates to a method for the open-loop or closed-loop control of an asynchronous machine with or without speed feedback, the asynchronous motor being controlled by a control device (converter or servo converter). First of all, a voltage vector rotating at a rotary field frequency is specified and impressed, both the rotary field frequency and the voltage vector being determined by an open-loop or closed-loop control based on a voltage-frequency characteristic curve configured in any manner and the voltage vector being adapted by a cos ? closed-loop control. Desired values of cos ? are calculated using rating plate data and equivalent circuit diagram data for an optimum-loss or loss-optimized operation of the asynchronous machine for the calculation of cos ?desired value, which results in optimized-loss operation. A value for cos ?actual is then determined using the impressed voltage vector and a current vector or using the real power and apparent power.

Abstract: A motor controller is provided with integrated metering and data logger functions to measure, store and report information suitable to verify the controller's energy saving performance. The integrated functions in the controller can be used to establish an AC motor's baseline electrical power and energy profile and to monitor continuously the power and energy reduction performance of the controller without requiring a separate meter and logger.

Abstract: A method for operating an electric vehicle, the electric vehicle having an electric motor and a brake device, and the electric motor and the brake device being capable of being influenced by a control device. When the electric vehicle is at a standstill, when there is an error of the control device, the brake device is actuated so that the electric vehicle cannot move, or at least can move only to a very limited extent.