Abstract: Electric drive devices having at least one power electronics module including at least one voltage circuit having power electronics components such as a converter, transformer, frequency inverter, power capacitor, circuit breaker and the like, and at least one fuse for interrupting the voltage circuit in the event of excess currents and/or voltages. The invention also relates to a wind turbine and similar large industrial electrical systems having such a drive device. The device can comprise at least one pyrotechnic fuse with a propellant charge for the irreversible interruption of the voltage circuit, wherein the pyrotechnic fuse is arranged in the voltage circuit of the power electronics module or immediately adjacent to at least one power electronics component such as a converter, frequency inverter, transformer, power capacitor or circuit breaker.

Abstract: A method for controlling an electric drive system and the electric drive system. The method includes: measuring an external variable; estimating a control variable for a current sampling step with a mathematical model; predicting a control variable for a future sampling step for each of a plurality of candidate voltage vectors selected for the future sampling step; and calculating a cost function, and identifying a primary voltage vector giving a minimum, where the cost function is defined as a deviation between the predicted stator flux and the reference stator flux. The method further includes: predefining a lookup table giving a correlation between a nonzero voltage vector and a voltage vector group including four candidate voltage vectors, where the plurality of candidate voltage vectors is selected referring the lookup table. The electric drive system includes motor, power converter, and controller, and configured to perform the method.

Abstract: An electric motor control system including an electric motor having a winding with a first and second end, a motor controller having a phase lead, the motor controller operable to direct a phase current to the phase lead. The electric motor control system also includes a first switching device that provides an electrical connection between the phase lead and the first end of the first winding when in a disabled state, and thereby flowing the phase current from the phase lead to the first end of the first winding, and a second switching device operably connected to the motor controller and providing an electrical connection between the second end of the first winding and a common point, when in an enabled state. The motor controller is operable to change the state of the first switching device to enabled, and the second switching device to disabled, under selected conditions.

Abstract: A torque ripple compensation apparatus including a torque measurement unit configured to output torque measured through a torque sensor of an MDPS system; a motor speed measurement unit configured to output motor speed measured through a position sensor of an MDPS motor; a control unit configured to separately output an offset signal and a torque ripple signal based on the motor speed information and the measured torque information; and a torque ripple compensation unit configured to synthesize a plurality of torque ripple signals outputted from the control unit, and output a torque ripple compensation signal as a motor control signal to the MDPS motor, the torque ripple compensation signal being used to compensate for the synthesized torque ripple signal.

Abstract: A system includes one or more processors configured to provide one or more control signals to cause supply of electric power from a power supply to one or more electric actuators. The one or more electric actuators are configured to adjust one or more components of a cable pressure control equipment (PCE) stack.

Abstract: A machine learning device includes: a state observer that observes, as a state variable, at least one of driving noise of a synchronous rotating machine and an error with respect to a preset position of a rotational position of the synchronous rotating machine determined by driving voltage; and a learner that determines a value of a parameter on a basis of the state variable observed by the state observer. The learner includes: a reward calculator that calculates a reward on a basis of the state variable; and a function updater that determines the value of the parameter on a basis of the reward that has been calculated. The reward calculator increases the reward when the driving noise is smaller than a target value of driving noise.

Abstract: An electric drive system for a vehicle includes a speed/position feedback device coupled to an electric machine and configured to provide an index pulse. The system further includes an inverter having a line voltage sensor. The system includes a controller programmed to, responsive to the electric machine rotating at a generally constant speed without commanding the inverter, generate a resolver offset from a time difference between a zero crossing of a line voltage and the index pulse and operate the inverter according to the resolver offset.

Abstract: A rotary electric machine control apparatus is provided which controls energization of a rotary electric machine having a plurality of winding sets. The apparatus includes an energization control circuit that is provided for each of the winding sets and has a switching element related to switching of energization to the winding set, a driver circuit that outputs a drive signal to the switching element through a signal line connected to the switching element, and a protection element that is connected to the signal line and in parallel with the switching element. When combinations of the winding sets and electronic components including the energization control circuit provided for each of the winding sets are regarded as systems, in at least one of the systems, performance of the protection element is differentiated from that in the other system to make noise resistance different from noise resistance in the other system.

Abstract: A motor control device includes: a first communication unit that transmits or receives data to or from a motor; a communication disconnection determination unit that determines that the motor and the motor control device are in a disconnection state based on a fact that there is no reply from the motor within a prescribed period, and that determines that the motor and the motor control device have been restored to a connection state based on a fact that a reply from the motor to the motor control device has been restarted; and a replacement determination unit that obtains identification information from an identification information storage of the motor via the first communication unit and determines that the motor has been replaced, when it is determined that the motor and the motor control device have been restored to the connection state.

Abstract: A power electronics arrangement includes an inverter to which an electric machine can be connected, and at least one half bridge to which at least two electric energy storage devices can be connected. One of the at least two electric energy storage devices at least temporarily supplies the electric machine, and one of the electric energy storage devices at least temporarily charges another energy storage device of the at least two electric energy storage devices by way of the electric machine and one of the half bridges. For this purpose, a control method for the power electronics arrangement operates according to the principle of space vector modulation.

Abstract: A system and a method for driving a motor with a frequency conversion mechanism are provided. The system includes a look-up table module, an oscillator circuit, a multi-frequency signal generator circuit, and a motor driver circuit. The look-up table module stores a preset driving signal. The oscillator circuit generates oscillating signals having different frequencies. The multi-frequency signal generator circuit outputs a multi-frequency signal according to the oscillating signals. One waveform segment of the multi-frequency signal in a modulation region has a first oscillating frequency. Another waveform segment of the multi-frequency signal outside the modulation region has a second oscillating frequency lower than the first oscillating frequency. When a back electromotive force or a phase current of the motor reaches zero within a time interval of the modulation region, the motor driver circuit drives the motor according to the preset driving signal and the multi-frequency signal.

Abstract: An AC-AC power converter, such as a motor soft starter, includes an input connectable to an AC source with a disconnect switch, an output connectable to an AC load, and phase lines connecting the input and output to transmit power. In-line solid-state switching blocks are connected between line terminals and load terminals of the AC source and AC load, respectively, such that each phase line includes a solid-state switching block connected thereto. Free-wheeling solid-state switching blocks are connected to the load terminals at one end and together at a common connection at another end, such that each phase line includes a free-wheeling solid-state switching block connected thereto. Each of the in-line and free-wheeling solid-state switching blocks comprises a bi-directional switching block that selectively controls current and withstands voltage in both directions. The switching blocks also provide soft-starter functions, variable speed control, and integrated circuit breaker protection capability.

Abstract: A handheld power tool includes a tool holder for holding a tool, an electric motor, a shaft connecting the tool holder and the electric motor, and a protective device for stopping the tool holder in an uncontrolled situation. The protective device includes a sensor for detecting the uncontrolled situation, a switchable current source and a normally closing magnetic brake. The switchable current source outputs a first current not equal to zero in response to signals of the sensor if an uncontrolled situation is not detected; the current source does not output a current or outputs a second current different from the first current if an uncontrolled situation is detected. The normally closing magnetic brake engages on the shaft and does not apply a torque to the shaft when energized by the first current. The normally closing magnetic brake applies a torque counteracting the rotational movement of the shaft when not energized or when energized by the second current.

Abstract: Setting of parameters that determine filter characteristics is facilitated. Machine learning of optimizing the coefficients of a filter provided in a motor control device that controls rotation of a motor for a machine tool, a robot, or an industrial machine is performed on the basis of measurement information of an external measuring instrument provided outside the motor control device and a control command input to the motor control device.

Abstract: A first radial force value and a second radial force value is received by a radial magnetic bearing controller. Coefficients are computed for a first equation using the first and second radial force values. The first equation is solved to define first solution values. A second solution value paired with each first solution value is computed using the first radial force value and a respective first solution value to define second solution values. Control current sets are computed for each unique paired solution of the second solution values and the first solution values. Each control current set includes a control current value for each of three control currents. A control current value for each of the three control currents is selected from the control current sets. The control current value for each of the three control currents is output to a respective radial winding of a three-pole radial magnetic bearing.

Abstract: Low cost linear Hall Effect sensors are used for determining motor shaft positions and generating voltages proportional to the motor shaft positions. The voltages from the linear Hall Effect sensors are compared to a triangle waveform and PWM signals are generated therefrom. A constant current source and constant current sink are used in the triangle waveform generator. The voltages from the linear Hall Effect sensors are adjusted to change the PWM duty cycles used to startup and vary the speed of the motor. Comparators compare the voltages from the Hall Effect sensors and product the PWM signals having duty cycles proportional to the voltage drive requirements of the motor.

Abstract: An electric power steering apparatus including: a steering torque detector to detect a steering torque of a driver; a motor to assist a steering force of the driver; an estimated speed calculator to calculate an estimated speed, which is an estimated value of a rotation speed of the motor; an estimated speed corrector to correct the estimated speed based on the steering torque; an estimated angle calculator to calculate an estimated angle of the motor by integrating the estimated speed after the correction; and an electric power supply to supply electric power to the motor based on the estimated angle, wherein the estimated speed corrector corrects the estimated speed when a determination signal, which is based on a value obtained by removing a frequency component of steering of the driver from a derivative of the steering torque, the steering torque, and the estimated speed have the same signs.

Abstract: A walking support robot of the present disclosure is a walking support robot that moves in accordance with a handle force while supporting walking of a user. The walking support robot includes a body, a handle that is on the body and is held by the user, a sensor that senses a force applied to the handle, and a moving device that includes a rotating member and moves the walking support robot by controlling rotation of the rotating member in accordance with the force sensed by the sensor. The walking support robot estimates a leg position of the user on a basis of a change of the force sensed by the sensor, and sets a load to be applied to the user on a basis of the leg position.

Abstract: A drive control apparatus and method for a yaw motor of a wind turbine is provided. The drive control apparatus includes a frequency converter, a fault cut-out contactor, and a contactor. The frequency converter is configured to perform drive control on the yaw motor. The fault cut-out contactor is connected in series between the frequency converter and the yaw motor, and configured to be switched off in a case of a fault in the frequency converter, to isolate the failed frequency converter. The contactor is connected in parallel with the frequency converter and the fault cut-out contactor, connected to the yaw motor, and configured to continue to drive the yaw motor in a case that the fault cut-out contactor is switched off. The drive control apparatus and method can solve problem of low reliability of drive control of the yaw motor.

Abstract: To provide a controller for an AC rotary machine capable of performing on/off control of the switching device of the set which does not fail, by considering the state of the AC rotary machine related to the windings of the failed set. A controller for an AC rotary machine, about a set in which the switching device failed, stops dq-axis current control, and turns on, in the case of the short circuit failure, and turns off, in the case of the open circuit failure, at least the respective phase switching devices of the positive electrode side or the negative electrode side which is the same side as the failed switching device; and about a set which does not fail, continues dq-axis current control and changes the current component of the d-axis according to the state of the AC rotary machine related to the windings of the failed set.