Abstract: The disclosure relates to a communication technique that converges a 5G communication system for supporting a higher data rate after a 4G system with IoT technology, and a system thereof. The disclosure may be applied to intelligent services (e.g., smart homes, smart buildings, smart cities, smart or connected cars, healthcare, digital education, retail, security and safety related services, etc.) based on 5G communication technology and IoT-related technology. In addition, the disclosure relates to a method and apparatus for performing communication in a wireless communication system composed of multiple cells.

Abstract: Various embodiments of the present disclosure provide a method for random access. The method which may be performed by a terminal device comprises determining a frequency hopping configuration for uplink shared channel transmission to a network node in a two-step contention-free random access procedure. The method further comprises performing the uplink shared channel transmission to the network node in the two-step contention-free random access procedure, according to the determined frequency hopping configuration. According to various embodiments of the present disclosure, frequency hopping may be configured for the uplink shared channel transmission in a two-step contention-free random access procedure in a flexible and efficient way, so that the performance of the random access procedure can be improved.

Abstract: A method of network visualization that includes receiving key performance indicator (KPI) data inputs collected for nodes included in a Radio Access Network (RAN); filtering the KPI data to remove unreliable KPI data inputs; determining whether the KPI data inputs for a predetermined geographic area exceeds a threshold sample count; causing a graphical user interface (GUI) to be output by a user interface (UI), the GUI including a display of a shape, corresponding to the predetermined geographic area, layered over a map, where the shape represents an indication of network coverage quality, based on the filtered KPI data inputs, for a location corresponding to the shape corresponding to the predetermined geographic area.

Abstract: A wireless device may support a plurality of channel state information (CSI) processes. The wireless device may send an indication of a number of supported CSI processes to a first base station. The first base station may send to the wireless device a handover command, instructing the wireless device to handover to a second base station. The handover command may comprise configuration parameters for CSI processes associated with the second base station. The configuration parameters may be based on the number of CSI processes supported by the wireless device.

Abstract: Methods, apparatuses, systems, etc. directed to beam management for, and/or for use in connection with, multiple cells and/or multiple transmission/reception points are provided. Among the methods is a method that may include any of determining first and second reference signals sets (RS sets) associated with first and second sets of beams; receiving information for first and second beam failure recovery (BFR) sets corresponding to the first and second RS sets, wherein the information indicates an RS set associated with candidate beams (CB-RS set) and an uplink resource set for each of the first and second BFR sets; determining beam failures based on the first and second RS sets; selecting the CB-RS set and UL resource set from the first or second BFR set; determining an RS of the selected CB-RS set; and transmitting information indicating the beam failures using uplink resources of the selected uplink resource set.

Abstract: A robot system includes a motor, an inverter, a first control portion, and a second control portion. The motor includes stator windings for three phases. The inverter includes series-connection bodies of a high-side switch and a low-side switch for three phases. A connection point of the high-side switch and the low-side switch for each of the phases is connected with the corresponding stator winding. One of the high-side switch and the low-side switch for each of the phases works as a brake switch. The first control portion and the second control portion performs a driving control of the brake switches. Each of the first control portion and the second control portion has a function of monitoring the robot system, and turns on the brake switches for at least two phases when detecting that an abnormality occurs in the robot system.

Abstract: A pump jack controller is provided that can harness the waste energy generated during the operation of a pump jack when its electrical motor is in an over-speed condition, and convert that waste energy into electrical energy that can be supplied back onto an electrical power grid thus converting the pump jack into a micro electric power generator.

Abstract: If a fault occurs in a buffer unit from which a PWM signal is outputted, an abnormal PWM signal may be outputted from the buffer unit. When a fault occurs in a first buffer unit, a fault detection unit detects a fault in the PWM signal being inputted via a second buffer unit. When the fault in the PWM signal is detected, the fault detection unit outputs a PWM fault signal to an arithmetic unit and the second buffer unit. In response to the input of the PWM fault signal, the second buffer unit sets the output thereof to high impedance and drives the inverter circuit by a protection operation PWM signal to perform protection operation of a motor.

Abstract: The present disclosure provides a system and method to determine at least one parameter of a motor, such as an inductance. The inductance can be determined, such as based on one or more digitally sampled motor winding currents. A digital filter can be applied to the digital samples such as to determine a slope of the motor winding currents. The digital filter can include a least squares fit that can be applied to the digital samples, such as to determine a slope of the motor winding currents. The least squares fit can be determined based on a computation of central tendencies such as an average value of time, an average value of current, an average value of the square of time, and the average value of the product of time and current. The average values can be determined recursively to provide improved computational speed.

Abstract: A numerical controller first creates a shortest path which does not interfere with an interfering object and shortens a movement distance from a start point to a cutting start position, and then, creates one or more alternative paths having a smaller number of break points than the shortest path when determining a movement path of a tool from the start point to the cutting start position. Then, each of a movement time along the shortest path and a movement time along the alternative path is calculated, and the alternative path having the shorter movement time than the shortest path is determined as the movement path.

Abstract: Electric motors may include one or more sensors usable to determine rotor alignment and/or speed. A method and apparatus for rotor alignment and/or speed error detection and/or correction are proposed, such as using signals from one or more sensors. A method and apparatus for controlling stator tooth activation based, at least in part, on corrections and offsets is also disclosed.

Abstract: A sheet conveyance apparatus includes a connection member to connect or separate a motor to drive a conveyance roller, where a motor rotor has a rotation phase and a motor winding includes a driving current controlled by a controller. Per control by the controller, a value of a torque current component of a detected driving current becomes a target value of the torque current component and a value of an exciting current component of the detected driving current becomes a target value of the exciting current component. The controller can cause a deviation between a rotor target phase and a determined rotation phase to decrease, cause magnetic flux passing through the winding to be weaker than a magnetic flux of the rotor, and cause the magnetic flux to be stronger than that passing through the winding in a first period.

Abstract: Disclosed are an error elimination amplifier and a motor control circuit using the same. The error elimination amplifier includes an amplification circuit, a switching circuit, a comparison circuit, an output comparator and a calibration circuit. The comparison circuit includes a first comparator and a second comparator. The switching circuit and the first input end of the output comparator are electrically connected to a signal output end of the amplification circuit. A second input end of the output comparator is coupled to a reference voltage. The calibration circuit is electrically connected to the amplification circuit. An offset of the amplifier is eliminated through the amplification circuit, the switching circuit and the calibration circuit.

Abstract: A system and method for position sensorless control of an AC electric machine is disclosed. A drive system for driving an AC electric machine provides a primary current excitation to drive the AC electric machine, the primary current excitation comprising a current vector having a magnitude and angle. The drive system injects a carrier signal to the AC electric machine that is superimposed onto the current vector, with the carrier signal generating a carrier response signal responsive to the injected carrier signal. The drive system measures at least one magnetic alignment signature of the AC electric machine from the generated carrier response signal and controls an orientation of the current vector using the measured at least one magnetic alignment signature to operate the AC electric machine.

Abstract: A method is provided for determining an operational readiness state of an electric motor, a pump motor for pumping an operating fluid, for example, an aqueous urea solution, in a vehicle. The method includes applying an electric drive voltage to the electric motor according to a prescribed drive voltage curve in order to drive a rotor of the electric motor to rotate through a prescribed angle of rotation, detecting a response behavior of the electric motor, and determining the state of the electric motor based on the results determined in step b).

Abstract: Methods and systems are provided to damp oscillations in a synchronous alternating current (AC) grid. Current may be received from the synchronous AC grid through a phase of an n-phase supply line. The current received from the synchronous AC grid is supplied to a phase of the synchronous motor. A sub-harmonic oscillation may be detected in the current received from the synchronous AC grid. The sub-harmonic oscillation may be damped by: shunting a portion of the current away from the phase of the synchronous motor during a first time period in an upper-half of the sub-harmonic oscillation, and/or supplying compensation current from a partial power converter to the phase of the synchronous motor during a second time period in a lower-half of the sub-harmonic oscillation.

Abstract: The present invention relates to a motor drive device and a phase current detecting method for a three-phase brushless motor, and more particularly to a technique of detecting each phase current through A/D conversion that is carried out once per PWM carrier cycle, by use of a current sensor for detecting a DC bus current of an inverter. The control unit of the present invention calculates a phase current for one phase, an absolute phase current value of which becomes maximum at a detection timing that is set once per PWM control cycle, from an output of the current sensor, and estimates phase currents for the remaining two phases based on a peak value of a phase current detected at each detection timing, a motor angle, and a phase shift of an actual phase current waveform relative to the motor angle.

Abstract: A sheet conveying apparatus for conveying a sheet includes a conveyance roller, a motor, a phase determiner, and a controller. The phase determiner determines a rotor rotation phase of the motor that drives the conveyance roller to convey the sheet. The controller controls so that a value of a rotor torque current component becomes a target value of the torque current component and controls so that an excitation current component value becomes a target value of the excitation current component, and controls to reduce a deviation between a command phase and the determined rotation phase. The controller controls so that a magnetic flux penetrating through a winding is weaker than a magnetic flux of the rotor, and so that a magnetic flux penetrating through the winding in a second period is stronger than the magnetic flux penetrating through the winding in the first period.

Abstract: A control system (48) having a motor (28) is disclosed. The control system (48) may include a converter (32) operatively connected to a power source (36), an inverter (34) operatively connected to the motor (28), and a controller (50) operatively connected to the converter (32) or inverter (34). The controller (50) may be configured to receive control command signals, receive state feedback signals, and generate duty cycle signals for upper and lower arms of each phase (40) of the motor (28) based at least in part on the control command signals and state feedback signals. The duty cycle signals may minimize neutral point current in the converter (32) or inverter (34).

Abstract: A three-phase switched reluctance motor torque ripple three-level suppression method. A first set of torque thresholds (th1low, th1zero, th1up) is set in rotor position interval [0°, ?r/3]. A second set of torque thresholds (th2low, th2zero, th2up) is set in rotor position interval [?r/3, ?r/2]. Power is supplied to adjacent phase A and phase B for excitation. The power supplied for excitation to phase A leads the power supplied for excitation to phase B by ?r/3. At this moment, phase A is turned off, phase B is turned on and three-level suppression of torque ripple of three-phase switched reluctance motor is realized by dividing the commutation process from phase A to phase B into two sections.