Abstract: A method for reducing a total operational load of a method of a model predictive control-by conducting simplifications based on specific observations, in order to drive alternating current motors by using the method of the MPC with a two-level voltage source inverter. The method includes the steps of determining at which one of the predefined sectors a resultant of stator currents is present, determining a motor mode, reducing seven estimation vectors to four estimation vectors and calculating a cost function or reducing seven estimation vectors to five estimation vectors and calculating the cost function.

Abstract: An outdoor power equipment includes multiple motors and a controller module. The motors include a first motor and a second motor. The first motor is structured to operate a first component of the outdoor power equipment and the second motor is structured to operate a second component of the outdoor power equipment. The controller module includes multiple motor controllers structured to communicate via a network communication bus with each other and operate the first motor and the second motor to operate the first component and the second component based on the communication via the network communication bus.

Abstract: A method and a circuit arrangement for damping stepper motor resonances during operation of a stepper motor, in particular in the medium and high speed range, is described, wherein the coils of the stepper motor are each connected into a bridge circuit comprising semiconductor switches, in order to impress into the coils a predetermined target coil current. The resonance damping is achieved by activating a passive FD-phase in the zero crossing of the target coil current, during which all semiconductor switches are opened or switched blocking, in order to thereby feed a coil current flowing in the related motor coil back into the supply voltage source either via inverse or body diodes and/or via diodes connected in parallel to the semiconductor switches in the reverse direction between the positive supply voltage and ground potential.

Abstract: A method for compensating parameter imbalance induced current harmonics in a synchronous motor drive includes receiving a command current signal corresponding to a generated command current. The method also includes receiving a position estimate signal indicating an estimated position of the synchronous motor drive and, in response to at least one current harmonic being induced by a parameter imbalance, determining a voltage adjustment value using the command current signal and the position estimate signal. The method also includes generating a voltage adjustment signal using, at least, the voltage adjustment value, the voltage adjustment signal being applied to the synchronous motor drive to compensate for the current harmonics induced by the parameter imbalance.

Abstract: Provided are a motor control method, a motor control device and a variable frequency drive. The method includes: performing an amplitude limiting on a command torque to obtain a target torque; calculating a target current based on the target torque; determining whether an amplitude of the target current is greater than a current limiting amplitude; performing an amplitude limiting on current components of the target current, when the amplitude of the target current is greater than the current limiting amplitude; and controlling a motor based on the current components of the target current after being performed the amplitude limiting. Thus, an amplitude limiting on current of a motor is achieved by performing amplitude limiting on torque and current.

Abstract: A technique for control loading employs a slotted motor having a higher power density than comparably-powerful slotless motors. The use of smaller slotted motors enables more efficient mounting hardware, smaller gear reduction mechanisms, and more efficiently mounted force transducers. The technique overcomes cogging and smooths torque response of the slotted motor by combining high-gain servo control with high-resolution motor sensing.

Abstract: A motor control actuator configured to drive a permanent magnet synchronous motor (PMSM) with sensorless Field Oriented Control (FOC) includes: a sampling circuit configured to measure a counter electro motive force (CEMF) or a back electro motive force (BEMF) of the PMSM, while the PMSM rotates, and generate a measurement signal based on the measured CEMF or the measured BEMF; a motor controller including a current controller configured to generate control signals for driving the PMSM, the current controller configured to receive the measurement signal and perform a catch spin sequence for restarting the PMSM while rotating based on the measurement signal; and a multi-phase inverter configured to supply multiple phase voltages to the PMSM based on the control signals. The motor controller is configured to match an output voltage of the multi-phase inverter to the measured CEMF or the measured BEMF during the catch spin sequence.

Abstract: Apparatus and method estimate a position of a movable stage. The apparatus comprises: a stator comprising 2D array of sensors arranged relative to one another to provide a plurality of stator-Y oriented sensor columns and a plurality of stator-X oriented sensor rows; a movable stage comprising a first Y-magnet array comprising a plurality of first magnetization segments generally linearly elongated in a stage-Y direction, each first magnetization segment having a stage-Y direction length, Lyy, and a magnetization direction generally orthogonal to the stage-Y direction, the magnetization directions of the plurality of first magnetization segments exhibiting a first magnetic spatial period ?x over a stage-X direction width, Wyx, of the first magnet array; and a controller connected to receive information based on an output from each of the sensors and configured to use the information to determine a stator-X direction position of the movable stage.

Abstract: A method for determining rotor characteristic of an alternating current (AC) electrical machine includes obtaining a reference voltage signal, one or more phase currents, and rotor data. The method includes determining orthogonal components of an extended back electromotive force (BEMF) model of the AC electrical machine based on the reference voltage signal, the one or more phase current characteristics, and the rotor data. The method includes determining a product of the orthogonal components of the extended BEMF model. The method includes determining a squared-magnitude of the orthogonal components of the extended BEMF mode. The method includes determining the rotor characteristic of the AC electrical machine based on the product of the orthogonal components and the squared-magnitude of the orthogonal components.

Abstract: An over-temperature protection system and method for a DC capacitor of an inverter are provided. In the over-temperature protection system, a capacitor generates a DC voltage on both terminals thereof. An inverter converts the DC voltage generated on the both terminals of the capacitor into an AC voltage and supplies the AC voltage to a motor. A controller induces a ripple current of the capacitor based on a driving point determined by a torque and a speed of rotation of the motor and determines whether the capacitor is in an over-temperature state based on a totalized value of the ripple current.

Abstract: A power module is provided that is configured to supply power to a load. The power module includes a current generator, a current rail, and a magnetic sensor. The current generator is configured to generate a current. The current rail is configured to receive the current and output the current from the power module. The current rail includes a first opening formed therethrough, and the current, while flowing along the current rail in an output direction, produces a magnetic field. The magnetic sensor is disposed in the first opening of the current rail, and is configured to generate a differential sensor signal based on the magnetic field impinging thereon. The current generator is further configured to regulate the current based on the differential sensor signal.

Abstract: A multistep finite control set model predictive control method for linear induction machines is provided, and the method belongs to a control technology field for linear induction machines. The method specifically includes the following steps: collecting a primary phase current of a linear induction machine in a three-phase coordinate system; solving a multistep reference voltage vector sequence by iteration according to a current value; keeping only two non-zero voltage vectors and one zero voltage vector that are closest to a reference voltage vector in each predictive step; and further eliminating a voltage vector sequence having a large cost function value through dynamic online comparison with a cost function value.

Abstract: A motorized surgical instrument is disclosed. The surgical instrument includes a displacement member, a motor coupled to the displacement member, a control circuit coupled to the motor, a position sensor coupled to the control circuit, and a timer circuit coupled to the control circuit. The control circuit is configured to receive, from the position sensor, a position of the displacement member in a current zone defined by a set displacement interval, measure time at a set position of the displacement interval, wherein the measured time is defined as the time taken by the displacement member to traverse the displacement interval, and set a command velocity of the displacement member for a subsequent zone based on the measured time in the current predefined zone.

Abstract: Disclosed are a portable private power generation apparatus, and a module equipped with same, the portable private power generation apparatus being small in size, and capable of efficiently generating private power to charge a battery, and able to be linked and used with a variety of smart modules when customary power cannot be supplied in times of emergencies such as during military operations, in refugee camps, during disasters due to earthquakes and the like, emergency situations on ships, and outdoor activities. The present invention comprises: a rotatable fly-wheel member; first and second rotating members for rotating the fly-wheel member; first and second wires for rotating the first and second rotating members, respectively, by means of a pulling action; first and second spring members for carrying out winding actions of the respective first and second wires; and a power generation member for generating power from the rotation of the fly-wheel member.

Abstract: A compressor system for generating compressed air for a compressed air supply system in a vehicle. The compressor system includes a brushed direct current electric motor (BDC electric motor); a compressor configured to be driven by the BDC electric motor; and a control unit for controlling the BDC electric motor and allocated to the BDC electric motor so as to delimit an operating current of the electric motor. A free-running current path is allocated to the control unit, the free-running current path being configured to delimit the operating current of the electric motor in a variable manner. A switch controller is allocated to the control unit, the switch controller being configured to specify a switched-on time period (t_ON) and/or a switched-off time period (t_OFF) for the electric motor in a variable manner.

Abstract: A rotor dynamics adjustment system includes a rotor system with at least one compressor section and at least one turbine section operably coupled to a shaft. The rotor dynamics adjustment system also includes one or more rotor system sensors configured to collect a plurality of sensor data from the rotor system, an electric motor operably coupled to the rotor system, and a controller. The controller is operable to monitor the one or more rotor system sensors while the rotor system is rotating. A dynamic motion of the rotor system is characterized based on the sensor data from the one or more rotor system sensors. A damping correction torque is determined to diminish the dynamic motion of the rotor system. The electric motor is commanded to apply the damping correction torque to the rotor system.

Abstract: A motor control apparatus that controls a first motor and a second motor that are synchronized includes a first motor control unit configured to control a driving voltage of the first motor based on the torque current instruction value, which is output based on a torque current of the first motor for the first motor, and a second motor control unit configured to control a driving voltage of the second motor based on the torque current instruction value, which is output based on a torque current of the second motor for the second motor, wherein the first torque correction unit or the second torque correction unit corrects the torque current instruction value for the first motor or the toque current instruction value for the second motor based on the torque current of the first motor and the torque current of the second motor.

Abstract: A power tool is provided including a brushless motor having a stator defining a plurality of phases and a rotor. A power unit is provided including power switches and a control unit outputs a drive signal to the motor switches to drive the phases of the motor using a trapezoidal control scheme over a series of sectors. The control unit sets a conduction band within which each phase is commutated to a baseline value that is greater than 120 degrees, sets at least one commutation transition point as a function of the set conduction band, and within each sector, monitors an open-phase voltage of the motor to detect a back electromotive force (back-EMF) voltage of the motor and control commutation of at least one phase based on the open-phase voltage of the motor in relation to the at least one commutation transition point.

Abstract: A method for controlling an electric motor is described herein. The method includes setting a current limit, a speed limit and a torque limit. The method also includes sensing a DC link current, comparing the sensed DC link current with the current limit and adjusting the torque limit based on the comparison with the current limit to provide an adjusted torque limit. The method also includes sensing the speed of the electric motor, comparing the speed with the speed limit and further adjusting the adjusted torque limit based on the comparison with the speed limit.

Abstract: A soft starter includes a plurality of live phases, wherein a semiconductor switching element and an electromechanical switch parallel-connected thereto are arranged in each phase. In the soft starter, on a load-facing side of the semiconductor switching elements and of the electromechanical switches, the plurality of phases are connected in a circuit forming a star point. The star point circuit includes at least one passive component and is configured for detecting a reduced voltage drop in a defective state of a semiconductor switching element and/or of an electromechanical switch.