Abstract: An air cooled resistor arrangement, comprising a resistor housing comprising an air inlet, an air outlet, a first side wall extending from the air inlet to the air outlet, and a second side wall extending from the air inlet to the air outlet on an opposite side to the first side wall, a plurality of elongated resistor elements arranged in the resistor housing, each one of the elongated resistor elements extending from the first side wall to the second side wall, wherein the plurality of elongated resistor elements is arranged in columns along a direction between the air inlet and the air outlet, wherein each one of the plurality of elongated resistor elements is arranged equidistantly to all its neighboring elongated resistor elements.

Abstract: A bootstrap drive circuit, a motor controller, a compressor, and a vehicle are provided. The bootstrap drive circuit includes a bootstrap unit, a negative voltage unit, a drive unit, and a voltage stabilization unit. The bootstrap unit is configured to provide the voltage stabilization unit with a bootstrap voltage. The voltage stabilization unit is configured to perform a voltage stabilization processing on the bootstrap voltage to output a stable drive voltage to the drive unit. The drive unit is configured to drive, in response to receiving a turn-on control signal and based on the stable drive voltage, a switch tube corresponding to the drive unit to be turned on, and to control, in response to receiving a turn-off control signal, the negative voltage unit to drive the switch tube to be turned off by generating a stable turn-off negative voltage based on the stable drive voltage.

Abstract: To satisfy a desired air flow-static pressure characteristic while satisfying constraints of a power supply capacity and without over-limiting the drive current. A motor drive control device includes: a control circuit unit configured to generate a drive control signal (Sd) for controlling an actual rotation speed of a motor based on a speed command signal indicating a target rotation speed of the motor; and a motor drive unit configured to drive the motor based on the drive control signal (Sd). The control circuit unit includes a power control unit configured to enable selection of one of: a speed feedback control mode to generate the drive control signal (Sd) so that the actual rotation speed of the motor matches the target rotation speed; and a current feedback control mode to generate the drive control signal (Sd) so that a drive current of the motor matches a target current.

Abstract: An air cooled resistor arrangement, comprising a resistor housing comprising an air inlet, an air outlet, a first inner wall extending in a direction from the air inlet to the air outlet, a second inner wall extending in direction from the air inlet to the air outlet, the first and second inner walls forming a primary air flow passage between the air inlet and the air outlet, a first outer wall extending in direction from the air inlet to the air outlet, and a first intermediate wall extending in direction from the air inlet to the air outlet, the first intermediate wall being arranged between the first inner wall and the first outer wall, and a plurality of elongated resistor elements arranged in the resistor housing, each of the plurality of elongated resistor elements comprises at its end portion an electrical connector element connectable to a source of electric power.

Abstract: A motor driver for setting duty cycles based on a temperature is provided. The motor driver senses a temperature of an environment around a motor. The motor driver sets a duty cycle modulation value according to the sensed temperature, and modulates a preset duty cycle to form a startup duty cycle according to the duty cycle modulation value. The motor driver sets or modulates duty cycles of one or more waveforms of a startup signal to be equal to the startup duty cycle. The motor driver outputs the startup signal to the motor.

Abstract: A motor control system determines an operating point for controlling an electric motor in an electric system that includes a battery and an electronic control unit. The motor control system includes a calibrator having an input for receiving a battery voltage of the battery, a motor speed, and a requested torque of the electric motor. The calibrator calculates a modified speed based on the received battery voltage, motor speed and requested torque. An operating point controller has an input for receiving a fixed battery voltage reference, the modified speed and the requested torque. The operating point controller determines the operating point for controlling the electric motor based on the received fixed battery voltage reference, the modified speed, and the requested torque.

Abstract: The invention provides a screw air compressor unit with energy storage, which mainly includes a power battery module, a frequency converter, a permanent magnet synchronous motor, and a screw air compressor respectively arranged therein. The frequency converter is connected to the power battery module and converts the electrical energy thereof into the voltage and frequency required by the permanent magnet synchronous motor. When the permanent magnet synchronous motor obtains electrical energy, and can correspondingly drive the screw air compressor to operate and store air. As mentioned above, by changing the power supply source, the power battery module is used to supply the power of the permanent magnet synchronous motor and the energy storage of the linked air compressor, which effectively achieves the functions and advantages of energy saving, noise reduction and equipment size.

Abstract: Disclosed are a motor control device capable of stably driving an AC motor even under influence of dead time, and an electric vehicle mounted with an AC motor controlled by the motor control device. The motor control device controls a power converter (2) to which an AC motor (2) is connected. The motor control device includes: a voltage vector calculation unit (18) that generates a voltage command of the power converter such that an AC amount of the AC motor matches a command value; and a damping ratio control unit (26) that calculates, on the basis of a vibration component of a dq-axis component of the AC amount, the vibration component of a d-axis component or the vibration component of a q-axis component at a time point when a phase of the AC amount advances, and generates a correction amount for correcting the voltage command on the basis of the calculated vibration component of the d-axis component or the calculated vibration component of the q-axis component.

Abstract: Devices, systems, and methods for positioning an end effector or remote center of a manipulator arm by floating a first set of joints within a null-perpendicular joint velocity sub-space and providing a desired state or movement of a proximal portion of a manipulator arm concurrent with end effector positioning by driving a second set of joints within a null-space orthogonal to the null-perpendicular space. Methods include floating a first set of joints within a null-perpendicular space to allow manual positioning of one or both of a remote center or end effector position within a work space and driving a second set of joints according to an auxiliary movement calculated within a null-space according to a desired state or movement of the manipulator arm during the floating of the joints. Various configurations for devices and systems utilizing such methods are provided herein.

Abstract: Systems and methods for an externally excited electric machine. The method for operation of the externally excited electric machine, in one example, includes operating the externally excited electric machine above a threshold speed in a first stator winding configuration of a stator and switching the stator from the first winding configuration to a second winding configuration while the externally excited electric machine is maintained above the threshold speed. In the system, the externally excited electric machine includes multiple rotor windings which are configured to be externally excited.

Abstract: A method for controlling a three-phase electric machine by a control unit operatively connected to a controller, to a sensor, and to an inverter includes: a first acquisition phase, wherein the control unit receives, from the controller, a first signal representative of a reference torque; a second acquisition phase, wherein the control unit receives, from the sensor, at least one further signal representative or one or more of the following quantities: an electric quantity of the inverter, an electric quantity of the three-phase electric machine, and a mechanical quantity of the three-phase electric machine; a control phase, wherein the control unit generates a control signal that it inputted to the inverter for generating an effective torque of the three-phase electric machine, wherein the control signal is determined on the basis of a reference stator voltage, wherein the reference stator voltage is determined by the control unit as a function of a reference amplitude value and a reference load angle value

Abstract: A voltage control device that controls an output voltage by turning on/off a switching element by a control pulse, the voltage control device including a modulation wave generation unit that generates a sinusoidal wave based on a driving voltage and a driving frequency as a modulation wave, an arithmetic unit that calculates, at any discrete time point [t], a moving average value of a voltage [v] output every time duration [?] smaller than a time cycle of the modulation wave in a time period [t?N? to t??] tracing back N (a positive integer) steps from the discrete time point [t] in accordance with Expression (1) below, and a control pulse generation unit that generates the control pulse in accordance with a result of a comparison between the moving average value and an instantaneous value of the modulation wave at the discrete time point [t].

Abstract: A method of parameter estimation for a PMSM (permanent magnet synchronous motor) includes: iteratively revising an estimate of an inductance parameter of the PMSM, until the estimate either converges to a predetermined accuracy level or diverges; and controlling a magnitude of phase currents injected into the PMSM during each iteration of revising the estimate of the inductance parameter. Additional methods of PMSM parameter estimation are described, including rotor flux linkage estimation.

Abstract: An aviation sidestick is a device that can be used to control various manned and unmanned equipment, including flying, ground, underwater, to control spacecraft in outer space and to control computer games. It consists of a housing, a handle with buttons and a scroll wheel, a bracket/arm, a compensating mechanism, a fixed base in the form of a spherical segment and a mechanism that simulates feedback located under the compensating mechanism, while the geometric centers of the sphere and the focus of the sphere segment do not coincide, but is positioned on the same axis.

Abstract: A motor control system includes a first STO circuit, a second STO circuit and a pulse control module. The first STO circuit includes a first filter circuit, a first STO switch, a first photocoupler circuit and a second photocoupler circuit. The first and second photocoupler circuits are connected in series. The first STO switch and the first filter circuit are connected with the first photocoupler circuit. The second STO circuit includes a second filter circuit, a second STO switch, a third photocoupler circuit and a fourth photocoupler circuit. The third and fourth photocoupler circuits are connected in series. The second STO switch and the second filter circuit are connected with the third photocoupler circuit. The pulse control module issues a pulse signal to the second and the fourth photocoupler circuits and detects whether the first or the second STO circuit is abnormal.

Abstract: Opening and closing mechanism which has a power supply (1), a rotation direction setter (2), a control unit (3), which is connected to the rotation direction setter (2), a valve actuator motor (5), which is connected to the control unit in which one of the connections is for sending a BREAK instruction from the control unit (3) to the motor (5), a signal which is sent when a shutdown occurs due to over-torque inferred from the motor rotation speed. This opening and closing mechanism is not limited by any wear of the plug, has no need to use measurement of the current drawn and establishes the torque level based on measurement of the motor rotation speed, the rotation speed corresponding to the nominal torque having been previously established.

Abstract: A surgical robotic system includes a control tower and a mobile cart. The control tower is configured to selectively output power and includes a frequency generator and a converter. The frequency generator is configured to generate an electrical frequency signal and the converter is configured to receive the electrical frequency signal and convert the electrical frequency signal to a first optical signal having a unique identifier frequency. The mobile cart is configured to receive the first optical signal from the control tower and includes an optical splice configured to loop the first optical signal back to the control tower as a second optical signal and deliver the first optical signal to a frequency monitor of the mobile cart.

Abstract: A method of reducing mechanical vibrations of a motor system including an electric motor, the method including: a) receiving a vibration-related signal based on measurements by one or more sensors mounted on the electric motor, b) generating a reactive torque reference based on the vibration-related signal, and c) controlling the electric motor based on the reactive torque reference and a main torque reference to counteract the mechanical vibrations.

Abstract: A servo control method for a multi-joint hydraulic manipulator based on adaptive sliding mode is provided. A motion trajectory of an end of the multi-joint hydraulic manipulator in a workspace is generated, and expected angular displacement, angular velocity and angular acceleration of individual joints are calculated. An actual angular displacement and an actual angular velocity of the individual joints under a current position-pose are calculated. Combined with a dynamic model of the manipulator, a driving force of individual joints is calculated. Based on the expected angular displacement, the actual angular displacement and the driving force, a sliding-mode surface is constructed. The adaptive law is updated to perform adaptive sliding-mode control for the manipulator. A system for implementing the servo control method is also provided.

Abstract: A power supply circuit in an inverter for driving an electrical machine includes a high-voltage branch with a high-voltage level, a low-voltage branch with a low-voltage level and a discharge branch with a discharge voltage level, wherein the high-voltage level is higher than the low-voltage level and the discharge voltage level. The high-voltage branch can be connected to the low-voltage branch via an operating DC/DC converter, and to the discharge branch via a discharge DC/DC converter. The discharge branch is different from the low-voltage branch. A low-voltage energy storage device is connected in the discharge branch. A method for using the power supply circuit includes, in a first operating mode, conducting current from the high-voltage branch via the operating DC/DC converter into the low-voltage branch, and in a second operating mode, conducting current from the high-voltage branch via the discharge DC/DC converter into the discharging branch.