Abstract: A electric motor control device comprising a converter section converting AC voltage to DC voltage, an inverter section converting DC voltage from the converter section to AC voltage and supplying said AC voltage to electric motor, an inverter control unit controlling said inverter section, a current detection unit detecting the current flowing in said electric motors and a power calculation unit estimating the temperature of said electric motors from said detected current, calculating the resistance of said electric motors from said estimated temperature, and calculating the copper loss from said calculated resistance.

Abstract: A circuit for calibration a motor position in a motor having multiple phases including first, second, and third phases is electrically connected to a first phase winding and a second phase winding of the motor. The circuit comprises a comparator having first and second inputs; and a plurality of resistors electrically connected between the motor and the comparator, the plurality of resistors comprising: first parallelly-connected resistors and second parallelly-connected resistors which are connected in series and are connected between the first input of the comparator and the first phase winding of the motor, third parallelly-connected resistors and two or more fourth parallelly-connected resistors which are connected in series and are connected between the second input of the comparator and the second phase winding of the motor, and fifth parallelly-connected resistors connected in series with the second parallelly-connected resistors and connected in series with the fourth parallelly-connected resistors.

Abstract: An induction machine with localized voltage unbalance compensation is disclosed. The use of an induction machine with a voltage unbalance correction compensator (VUC) may be used to maintain proper working conditions of the machine during intervals of voltage unbalance.

Abstract: A motor control system providing at least seventeen speed settings using industry standard control signals and an industry standard five pin speed connector. One speed monitoring pin transmits an output signal for monitoring the speed of the motor, and four speed setting pins receive input signals for setting the speed. One of the speed setting pins receives and decodes two binary states and two frequency states, thereby providing a total of thirty-two speed settings. A non-regulated isolated winding is added to an internal transformer to provide an internal isolated flyback power supply for the motor, thereby liberating a pin on the industry standard five pin speed connector to provide the fourth speed setting input pin. Transmission circuitry is associated with the speed monitoring pin, and the non-regulated isolated winding is used to provide a direct current bias to the transmission circuitry.

Abstract: The present disclosure provides a direct drive transmission system and a control method. The direct drive transmission system includes: a base plate, guide rails, a plurality of stators, a mover, a plurality of drivers, and a controller. The plurality of stators are configured to drive the mover to slide on the guide rails. A transmission line composed of the plurality of stators is configured to have at least one low-accuracy segment and at least one high-accuracy segment connected to each other. The direct drive transmission system further includes at least one first switching signal device and a plurality of second switching signal devices. The at least one first switching signal device aligns with a respective second switching signal device, and each second switching signal device is electrically connected to a respective driver or the plurality of second switching signal devices are all electrically connected to the controller.

Abstract: A stepless regulation fan includes a fan main body and a control circuit board. The fan main body is equipped with first motors and fan blades connected to the first motors. The control circuit board includes an MCU, a stepless regulation element and a first driving circuit. The stepless regulation element and the first driving circuit are electrically connected to the MCU. The stepless regulation element is used for user operation, and the first driving circuit is electrically connected to the first motors. When the stepless regulation element is operated, a stepless regulation signal within a preset regulation range is fed back to the MCU. Based on the stepless regulation signal, the MCU outputs a rotating speed control signal corresponding to the stepless regulation signal to the first driving circuit. The first driving circuit adjusts driving power output to the first motors based on the rotating speed control signal.

Abstract: The present directed to a cordless power tool system including a plurality of cordless power tools, a plurality of fixed voltage and multi-voltage battery packs and a plurality of battery pack chargers. The battery packs include circuitry to indicate various parameters about the battery pack and communicate this indication to the power tools in order to enable the power tools to alter their motor output schemes to improve performance. The indication may include whether the battery pack is a fixed voltage battery pack or a multi-voltage battery pack and when the multi-voltage battery pack is in a first configuration or a second configuration.

Abstract: A valve actuator includes a motor, an AC power source, a DC braking system, and a control system. The control system is configured to control the AC power source to apply an AC voltage to the motor to drive a valve toward a closed position. The control system is configured to disconnect the AC voltage from the motor before the valve reaches the closed position. The control system is configured to control the DC braking system to apply a DC voltage to the motor to stop motion of the valve.

Abstract: A network of an electric vehicle has an energy supply interface, an inverter, an energization interface and a soft starter. The inverter has a first inverter connection configured to connect the inverter to the energy supply interface and a second inverter connection configured to connect the inverter to the energization interface and the soft starter. The inverter is configured to convert a DC voltage applied to the first inverter connection to an AC voltage and to supply same at the second inverter connection. The soft starter is configured to reduce an input voltage applied to the first soft starter connection and to supply the operating voltage, which is reduced compared to the input voltage, at the second soft starter connection.

Abstract: Various embodiments of surgical robot control systems are disclosed. In one example embodiment, the surgical robot control system comprises a housing. A controller is located within the housing and is coupled to a socket. The socket receives a handheld surgical user interface therein to control a surgical instrument. The surgical instrument is connected to the surgical robot and comprises an end effector and a mechanical interface to manipulate the end effector. The mechanical interface is coupled to the controller. At least one sensor is coupled to the controller and the socket to convert movement of the handheld surgical user interface into electrical signals corresponding to the movement of the surgical instrument. At least one feedback device is coupled to the controller to provide feedback to a user. The feedback is associated with a predetermined function of the surgical instrument.

Abstract: A control apparatus of an inverter that controls the drive of a traction motor of a vehicle is described. At a time when the vehicle starts moving by the drive of the traction motor, the control apparatus executes control processing to set a carrier frequency of the inverter to a low frequency within an audible range, and at a time other than when the vehicle starts moving, the control apparatus executes control processing to set the carrier frequency to a high frequency higher than the low frequency.

Abstract: Disclosed herein is a motor driver circuit including a logic circuit that generates a second code which changes linearly with a slope “a” with respect to a first code based on a position command for a linear motor to be driven and that can switch the slope “a,” a D/A converter that converts the second code into an analog control signal, and a driver that drives the linear motor such that a current detection signal indicating a drive current of the linear motor approaches a target value that changes linearly with a slope “g” with respect to the control signal, the driver being configured to switch the slope “g.” The motor driver circuit is switchable between a first state in which g=g1 and a=a1 and a second state in which g=g2 (where |g2|>|g1|) and a=a2=a1×(g1/g2).

Abstract: A new method and circuit arrangement for operating an electric motor, such as a stepper motor, in a control loop for preventing motor stall, the electric motor comprising at least a first motor coil and a second motor coil, the method comprising: operating the electric motor at a velocity equal to the target velocity; receiving a load value associated with an electric motor load; and determining whether the load value is greater than a load value threshold. Based on a determination that the load value is greater than the load value threshold decreasing the velocity of the electric motor to a velocity less than the target velocity.

Abstract: Disclosed are a sensorless induction motor system including a controller configured to control operation of a motor by controlling a voltage applied to each phase of a stator, to set a stop waiting time expected to be required for the rotor to stop during stop control of the motor, to apply a pulse voltage to each phase of the stator a plurality of times after the stop waiting time, and to determine that the rotor is stopped when rotor position vectors having largest induced current deviations are observed as the same rotor position vector, and a control method thereof.

Abstract: Examples may include an apparatus including a circuit coupled between a supply line, a return line, and a terminal. The circuit may provide an oscillating signal to the terminal. The circuit may include a first switch to couple the supply line with the terminal. The circuit may also include a second switch to couple the return line with the terminal. The circuit may also include a first inductor coupled between the first switch and the terminal. The circuit may also include a second inductor coupled between the second switch and the terminal. The circuit may also include a first diode coupled between the return line and an internal node of the first switch and the first inductor. The circuit may also include a second diode coupled between the supply line and an internal node of the second switch and the second inductor. Related systems and methods are also disclosed.

Abstract: In accordance with at least one aspect of this disclosure, a system includes, a servo configured to control a position of a valve, a driver operatively connected to control movement of the servo, a control module operatively connected to control the driver, can configured to control the driver with pulse width modulated output to control a frequency of a generator through movement of the servo.

Abstract: A robotic device is described. The robotic device includes segments and arms connected to a platform. A machining or another processing tool can be coupled to the platform. The segments can have one end attached to the platform and the other end attached to an attachment device. The attachment device can include an attachment surface/mechanism that can attach to a workpiece.

Abstract: A static auto-tuning system and method for controlling operation of a motor in a system. A speed reference signal is generated resulting in a speed response of the motor. Closed-loop feedback magnifies the rotating friction effect to an observable level. Inertia and rotating friction coefficient values of the system are estimated based on the speed frequency response and a virtual damping coefficient. A fixed low frequency speed signal may result in a first frequency response function for determining virtual damping, and a variable frequency excitation signal may result in a second frequency response function for determining the inertia and rotating friction characteristics. Closed-loop gains are determined based on these characteristics. The excitation signal may be sampled and a peak value in each interval may be identified and stored to produce an envelope of peak values for determining the gain response. Operation of the motor is controlled using the determined gains.

Abstract: An electrical power conversion apparatus is provided in which a heat generation abnormality-state such as an abnormal state of a cooling device is determined earlier in its determination, so that it becomes possible to securely perform a protective operation even in the heat generation abnormality-state. A control device estimates a change rate of a temperature detection value on the basis of a switching-element loss calculation value of a semiconductor switching element(s) calculated at least based on an electric current detection value, and compares a temperature-detection change-rate calculation value calculated from a temperature detection value with a temperature-detection change-rate estimation value, so that a heat generation abnormality-state of the semiconductor switching element(s) is estimated.

Abstract: A method in a system is provided for handling failures in a process control system including a plurality of compute nodes. The process control system includes at least two instances of virtualized distributed control nodes, VDCNs, deployed in a respective compute node of a cluster of at least two compute nodes, wherein a first VDCN is a primary VDCN controlling an automated process and at least a second VDCN is a backup VDCN. The method includes detecting that the number of instances of the VDCNs is less than a set number and assigning the role of primary VDCN to the second VDCN. A device, computer program, computer program product and system are also disclosed.