Abstract: A control device as a noise estimation device is applied to a vehicle including an internal combustion engine as a power source and a transmission as a power transmission mechanism. The control device is provided with a storage device that stores mapping data, which is data that defines a mapping learned by machine learning, and a CPU as an execution unit. When variables on an output of the power source and variables indicating a state of the power transmission mechanism are input as input variables, the mapping outputs, as output variables, variables indicating a sensory level of noise caused when rattling sound generated by the operation of the power transmission mechanism is transmitted to a cabin of the vehicle. The CPU estimates the sensory level based on the values of the output variables output from the mapping by inputting the values of the input variables into the mapping.

Abstract: A pressure control device has at least two switching valves (10, 12), a feedback control unit (14), a sensor unit (20), and a voltage supply unit (24), and continuously adjusts hydraulic systems.

Abstract: A filter arrangement in connection with a power converter for transferring power between a multiphase AC voltage network and a DC voltage network. The filter arrangement comprises a differential mode coil coupled between each AC terminal of an inverter bridge and corresponding AC network phase terminal, and a common mode coil coupled between each inverter bridge DC terminal and corresponding DC network terminal. Both inductors are located in the same magnetic core structure such that each of the differential mode winding is wound around its own phase-specific core leg and all common mode windings are wound around their own single core leg. The winding direction of both AC- and DC-side inductor windings is such that a common-mode current which flows along both inductors in the same direction, induces in each magnetic core leg a flux which reinforces the total flux circulating in the magnetic core.

Abstract: A controller for a power conversion circuit includes a first limiter for limiting a compensating voltage component within a compensating voltage switching level. A delay time measurement section measures an ON-delay time and an OFF-delay time, based on a binarized digital value and a PWM command value. A multiplier calculates an error voltage component average value by multiplying an average value of the ON-delay time and the OFF-delay time by a value that is obtained by dividing a direct-current power supply voltage by a half cycle of a triangular wave carrier signal. A second limiter extracts a component of the error voltage component average value that is beyond the compensating voltage switching level in absolute value. An adder sets a combined compensating voltage component to a sum of a limited compensating voltage component outputted by the first limiter and a limited error voltage component outputted by the second limiter.

Abstract: A drive protection device for protecting a traction drive in a vehicle, in particular a rail vehicle, includes at least one switching unit having an activation position and a deactivation position that protects the drive. A control unit is provided to trigger a transfer into the deactivation position, in at least one first operating situation, when an operating variable of the drive is in a critical region. In order to provide a drive protection device of this type, which can be used with a high degree of safety in as-wide-as-possible a range of operating situations of the vehicle, while still being simple to construct and cost-effective to implement, the control unit maintains the activation position, in at least one second operating situation, when the operating variable is in the critical region.

Abstract: Provided are a motor control device and a method for controlling a motor control device. A switching frequency is varied with respect to a control sampling for controlling an inverter, whereby controlling is performed by securing a required control sampling according to a motor speed.

Abstract: A power conversion device includes: a first power conversion circuit that converts power inputted from outside and outputs the converted power to a second power conversion circuit connected to the first power conversion circuit via a DC link, which outputs the converted power to a load; smoothing capacitors provided in an output part of the first power conversion circuit and an input part of the second power conversion circuit; a first and second common mode current extraction circuits provided in an input part of the first power conversion and second power conversion circuits; and a virtual neutral potential line that connects the first and second common mode current extraction circuits; a DC link filter circuit that includes a Y-shaped capacitor connected between the DC link part and the virtual neutral potential line.

Abstract: A chiller system includes a compressor configured to circulate a refrigerant between an evaporator and a condenser in a closed refrigerant loop and a synchronous motor configured to drive the compressor. The motor includes a stator winding and a rotor. The chiller system includes a controller configured to estimate a flux linkage of the rotor and generate a control signal for the motor based on the estimated flux linkage. Estimating the flux linkage includes applying a voltage of the stator winding to a transfer function having an error correction variable, using a first value of the error correction variable in the transfer function to obtain convergence of the flux linkage over an initial motor starting interval, and using a second value of the error correction variable after the initial motor starting interval to reduce an error in estimating the flux linkage.

Abstract: The brushless motor control device according to the present invention includes a drive controller, current detection circuits, AD converter circuits, a clock generation circuit, a pulse output circuit, and an RC filter. The drive controller generates a driving signal for driving a brushless motor. The current detection circuits each detect a current of the brushless motor. The AD converter circuits are each connected to a different one of the current detection circuits. The clock generation circuit outputs a clock pulse. The pulse output circuit outputs a pulse signal according to the clock pulse. The RC filter receives the pulse signal. The RC filter is formed of a resistor and a capacitor connected in series. A pull-up resistor connecting to a predetermined power supply is connected to an intermediate connection point between the resistor and the capacitor. The intermediate connection point is connected to the AD converter circuits.

Abstract: A method for testing a component part of an aircraft comprises the steps of determining at least one first test value of the component part of the aircraft and/or at least one first test value of a comparable component part of a further aircraft for at least one test parameter, inputting the first test parameter and the first test value into a pattern recognition system, which produces an inner correlation between the first test parameter and the first test value. The method further comprises the steps of defining at least one second test parameter, inputting the second test parameter into the pattern recognition system in order to determine a second test value by means of the inner correlation, checking whether the second test value falls within the predefined value range, and determining a third test value of the component part of the aircraft for the second test parameter if the second test value falls within the predefined value range.

Abstract: Embodiments of the invention provide methods and apparatus for reducing steering effort in a vehicle. In one embodiment, a method for installing a steering-assist system onto a vehicle having an electrically powered steering system is provided. The method includes placing a controller between a torque sensor and an electronic control unit (ECU) disposed on the vehicle, coupling a primary signal line from the torque sensor to be in electrical communication with the controller, and coupling a secondary signal line to the controller to be in electrical communication with the ECU, wherein, when movement is detected by the torque sensor, the torque sensor provides a primary signal to the controller and the controller provides a secondary signal to the ECU, the secondary signal being different than the primary signal.

Abstract: A vibration control robot system of the present invention includes: a robot controller (101) transmitting an operation command value and receiving an output value of a pulse encoder of the servo motor, wherein the robot controller includes a controller-side communication unit (5) which transmits the operation command value and the output value of the pulse encoder to a robot vibration controller; and the robot vibration controller (11) including: an acceleration sensor interface (15); a corrected operation command value calculation unit (13) which calculates a corrected operation command value obtained so as to suppress vibration of the robot; and a vibration-controller-side communication unit (12) which transmits the corrected operation command value to the robot controller (101), wherein the robot vibration controller (11) is arranged independently of the robot controller (101).

Abstract: An embodiment of a motor controller includes a motor driver and a signal conditioner. The motor driver is configured to generate a motor-coil drive signal having a first component at a first frequency, and the signal conditioner is coupled to the motor driver and is configured to alter the first component. For example, if the first component of the motor-coil drive signal causes the motor to audibly vibrate (e.g., “whine”), then the signal conditioner may alter the amplitude or phase of the first component to reduce the vibration noise to below a threshold level.

Abstract: A method for activating a jamming protection function in an electrical closing system. The jamming protection function is designed to abort a movement of a closing part in a movement direction if it is detected that the movement of the closing part is obstructed by a jammed object by: —providing consecutively measured values of a motor variable of a motor that effect the movement of the closing part, wherein the motor variable gives an indication of a drive torque provided by the motor; —determining a gradient curve from the consecutively measured values of the motor variable, wherein the gradient curve is established using a derivative method that provides for a weighting of the individual consecutively measured values of the motor variable according to the measurement sequence thereof; —establishing a point in time for activating the jamming protection function according to the determined gradient curve.

Abstract: Provided herein are devices, systems, and methods for electrically-augmented damping of an actuator and associated devices. In particular, electrically-augmented damping derived from measurement of voltage across an actuator and current flowing through an actuator is provided.

Abstract: A vehicle damper including an electromagnetic damper configured to generate a damping force with respect to a motion of a sprung portion and an unsprung portion toward each other and a motion thereof away from each other and includes: an electromagnetic motor; a motion converting mechanism; and an external circuit which is disposed outside the electromagnetic motor and including a first connection passage and a second connection passage and which includes a battery-device connection circuit for connecting the motor and a battery device and a battery-device-connection-circuit-current adjuster configured to adjust an electric current that flows in the battery-device connection circuit, wherein the damper system further includes an external-circuit controller configured to control an electric current that flows in the electromagnetic motor by controlling the external circuit and configured to control a flow of an electric current between the battery device and the electromagnetic motor by controlling the battery

Abstract: Systems, methods, devices, and computer readable media for controlling a digging operation of an industrial machine. A method includes determining a hoist bail pull associated with the industrial machine, determining a crowd torque limit value for a crowd drive based on the determined hoist bail pull of the industrial machine, and setting a crowd torque limit of the crowd drive to the crowd torque limit value to limit a torque associated with a crowd motor to the crowd torque limit value.

Abstract: A damping apparatus for an automobile is provided, capable of ensuring a high level of reliability while obtaining excellent damping effect with simple configuration. The damping apparatus for an automobile that reduces vibrations of an automobile body may include an actuator that is attached to the automobile body and drives an auxiliary mass; a current detector that detects a current flowing through an armature of the actuator; a section that detects a terminal voltage applied to the actuator; a calculation circuit that calculates an induced voltage of the actuator, and further calculates at least one of the relative velocity, relative displacement, and relative acceleration of the actuator, based on a current detected by the current detector and the terminal voltage; and a control circuit that drive-controls the actuator based on at least one of the relative velocity, relative displacement, and relative acceleration of the actuator calculated by the calculation circuit.

Abstract: Motor drives and switch driver power systems are presented in which high frequency AC current (IHF) is provided through one or more cables (202) magnetically coupled with local driver current transformers (240), and the transformer secondary currents are converted to provide DC power to switch drivers of an active power converter stage (110a, 110b) in the motor drive.

Abstract: Power conversion systems with active front end converters for example motor drives and power generation systems for distributed energy sources are presented with adaptive harmonic minimization for grid-tie converters for minimized or reduced total harmonic distortion in the line current spectrum including the source harmonic current and the grid-tie converter injected current spectrum referred to the line side.

Abstract: An active motor damping system and method for dampening oscillations of a driveline in a vehicle includes generating a commanded torque indicative of an actual torque which would counteract the oscillations if delivered by a motor to the driveline. The commanded torque is adjusted as a function of a phase lag between the commanded torque and an actual torque which the motor would deliver in response to the commanded torque such that in response to the adjusted commanded torque the motor delivers the actual torque which counteracts the oscillations.

Abstract: A drive system for a compressor of a chiller system includes a variable speed drive. The variable speed drive is arranged to receive an input AC voltage at a fixed AC input voltage and provide an output AC power at a variable voltage and variable frequency. The variable speed drive includes a converter connected to an AC power source providing the input AC voltage. The converter is arranged to convert the input AC voltage to a DC voltage. A DC link is connected to the converter. The DC link filters and stores the DC voltage from the converter. An inverter is connected to the DC link. A motor connectable to the compressor for powering the compressor. An active filter connected in parallel with the motor. The active filter is arranged to generate high frequency currents having a magnitude and opposite polarity, with respect to the output AC power of the variable speed drive. The high frequency currents generated by active filter substantially cancel out high frequency currents flowing into the motor.

Abstract: A power conversion device includes a main circuit that has switches connecting each phase of a three-phase AC power supply to each output phase, an LC filter having a reactor and a capacitor connected between the three-phase AC power supply and each bidirectional switch, and a current detector detecting an input current or a load current, and a four-step commutation device generating four steps on the basis of the polarity of the load current. The four-step commutation device sets times between the steps to a value more than zero so as to inhibit open circuit between output phases and short circuit between power supply phases, and sets the times between the steps in accordance with the polarity of the load current so as to cancel a distortion of an output voltage due to four-step commutation during a PWM cycle.

Abstract: To reduce, in a power converting apparatus for an electric locomotive, a sixth-order harmonic noise induced by a torque ripple component equivalent to a sixth-order frequency of an inverter frequency. When a motor is driven in a three-pulse mode to drive the electric locomotive, three pulses included within a ½ cycle of the inverter frequency in a PWM waveform, which is used for controlling a switching element of an inverter unit that drives the motor, are set to satisfy Tq?T/8, Tp?Tq/2, and Tr?Tq/2 where, assuming that the three pulses include a first pulse, a second pulse, and a third pulse from an order of generation, Tp is a pulse width of the first pulse, Tq is ½ of a pulse width (full width at half maximum of a pulse) of the second pulse, Tr is a pulse width of the third pulse, and T is a cycle of the inverter frequency.

Abstract: To reduce noise by limiting a current peak value to a predetermined value or less and by smoothing the waveforms of drive currents during the current limitation, switching control means (30) according to the present invention turns ON all of one-side drive transistors selected from the high-side drive transistors (21, 22 and 23) and the low-side drive transistors (25, 26 and 27) of power supply means (20) for a predetermined period, and turns OFF all of the other-side drive transistors for a predetermined period in response to a current control signal for the current peak value to a predetermined value or less.

Abstract: A method for reducing audible motor noise in a motor drive, wherein the motor drive includes a motor controller driving a PWM space vector modulator providing gating pulses to an inverter providing phase currents to the phase windings of the motor, and wherein phase currents of the motor are determined by taking samples of the DC link current in a DC link powering the inverter. The method comprises determining the speed of the motor and comparing the speed to a preset threshold, the preset threshold defining a speed at which audible noise is generated by the motor due to a minimum pulse constraint being imposed on the motor phase currents in order to reliably sample the DC link current to measure the phase current. If the speed is below the threshold, the DC link current in the DC link is sampled using a reduced number of current samples for a PWM cycle of the PWM space vector modulator to reduce audible motor noise.

Abstract: A method for controlling fan speed is disclosed. Firstly, a number of temperature ranges are defined. Each temperature range is associated with a corresponding fan speed. Each two adjacent temperature ranges overlap. The temperature of an electronic system is measured and is compared with the defined temperature ranges to determine whether it enters into a new range. If the measured temperature exceeds any one of the limits of a temperature range associated with the current fan speed, it enters into a new temperature range. The fan speed is adjusted to which is associated with the new entered temperature range. The overlap of each two adjacent temperature ranges covers the fluctuation of the temperature of the electronic system caused solely by the adjustment of fan speed caused by the traversing of the measured temperature between the two adjacent temperature ranges.

Abstract: Suppression of vibration of a load machine without reducing the responsiveness of the load machine to an operation command is achieved by a method and an apparatus for controlling an inertial system intended to control an inertial system that has a motive power generator and a load machine that are coupled to each other via a torque transmission element. Acceleration command information that designates the acceleration of the load machine is multiplied by a predetermined gain to produce a vibration suppression control variable. The vibration suppression control variable is added to the position command to form a vibration suppression control command, and the inertial system is controlled according to the vibration suppression control command.

Abstract: A method for controlling a demand for engine power in a control for an engine in a hybrid electric vehicle with power-split characteristics. Following transitions from acceleration or deceleration operating modes to a steady-state operating mode, power demand excursions from road-load power are attenuated or avoided by filtering the power demand using a filter constant that changes within battery power constraints as a function of a normalized driver demand for power at traction wheels for the vehicle.

Abstract: A method and a control system for starting a motor (19), in particular a motor (19) for driving a compressor. The rotational speed (24) of the motor (19) is measured and compared to a minimum value. In the case that ?motor (24) is smaller than the minimum value after a predefined time interval has lapsed, the motor (19) is stopped, and the maximum current level to be supplied by the power source (18) is changed, preferably increased, before a new attempt to start the motor (19) is initiated. Preferably, the voltage (22) supplied to an electronic unit (21) is also measured, and in the case that it drops below a minimum voltage level, the motor (19) is stopped, and the maximum current level is changed, preferably decreased, before a new start attempt is initiated. It is possible to adjust the supplied current level in such a way that power is conserved while sufficient lubricated of the moving parts of the compressor is ensured.

Abstract: A motor drive system control provides global closed loop feedback to cooperatively operate system components to adaptively reduce noise and provide noise cancellation feedback. An active EMI filter reduces differential and common mode noise on an input and provides a noise level indication to a system controller. Power switches in both a power converter and power inverter are cooperatively controlled with dynamic dv/dt control to reduce switching noise according to a profile specified by the controller. The dv/dt control is provided as an analog signal to a high voltage IC and codified as a pulse width for a level shifting circuit supplying control signals to the high voltage gate drive. A noise extraction circuit and technique obtain fast noise sampling to permit noise cancellation and adaptive noise reduction.

Abstract: A system and method for extracting estimated input voltage and input current values of an AC motor based on sensed power inverter output voltage and output current when the AC motor is connected to a front-end EMI filter and the EMI filter is connected to a power inverter. Where the system includes a current estimator portion, and a voltage estimator portion. The estimated input values are used by a feedback controller in the power inverter to control the motor. A second system and method for extracting estimated an input current of an AC motor based on the actual motor input voltage, and the output voltage of the power inverter.

Abstract: A method and apparatus for managing power demand of a motor in a cyclic load system having a rotational mass is provided. Flat power draw is achieved through continuous manipulation of the motor torque as a function of feedback velocity while using the rotational mass of the cyclic load as a means to store/retrieve energy. Alternatively, reduced variation of power draw is accomplished through continuous manipulation of motor velocity as a function of feedback torque. The methods and apparatus are used in systems where zero or reduced power demand variation is either required or desired, such as in generator powered applications.

Abstract: A control apparatus and a semiconductor apparatus of AC motors capable of reducing torque ripple with a comparatively simple circuit corresponding to a high withstand voltage and capable of driving a motor at high efficiency even when the rotational speed or load has changed. The control apparatus detects first phase signals fixed in relative phase to induced voltages of the motor and current polarity signals, recognizes phase differences between them, generates second phase signals so as to make the phase differences approach zero to drive the motor at high efficiency, generates modulation wave signals having quasi-sinusoidal waveforms or trapezoidal waveforms on the basis of the second phase signals, compares the modulation wave signals with a carrier wave signal, and conducts PWM control on an inverter.

Abstract: A method for greatly reducing magnetic sound of an alternating current rotating machine compared with the past comprising superimposing an n?1-th order frequency in inverse turn on a multi-phase alternating current with reference to a basic frequency component of the multi-phase alternating current supplied to an armature of the alternating current rotating machine of multiple phases so as to reduce the n-th order harmonic components of the basic frequency component among radial direction magnetic vibrating forces generated in the radial direction in a core of the alternating current rotating machine.

Abstract: A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around first and second outer legs, respectively; and first and second common-mode coils are wound around the inner leg of the choke. The first and second differential coils smooth the DC current on a DC bus in the motor drive, and the first and second common-mode coils suppress common-mode voltages in the motor drive. Also disclosed is a method for suppressing common-mode voltages in a motor drive.

Abstract: A motor driver drives a motor composed of a rotor and plural-phase windings that generate a magnetic field for rotating the rotor, including: a plurality of transistors that operate as switches for supplying current to the windings; a position detector operable to detect a rotational position of the rotor, based on a terminal voltage of each winding; and a switching controller operable to have performed a switching method to turn the transistors to an ON state or to an OFF state for controlling the rotor at the predetermined speed by means of the position detector, wherein the switching controller further controls so as to force each of the transistors into the OFF state for a predetermined duration in a predetermined cycle, and the position detector detects only while the switching controller forcedly keeps the transistor in the OFF state.

Abstract: A motor drive system control provides global closed loop feedback to cooperatively operate system components to adaptively reduce noise and provide noise cancellation feedback. An active EMI filter reduces differential and common mode noise on an input and provides a noise level indication to a system controller. Power switches in both a power converter and power inverter are cooperatively controlled with dynamic dv/dt control to reduce switching noise according to a profile specified by the controller. The dv/dt control is provided as an analog signal to a high voltage IC and codified as a pulse width for a level shifting circuit supplying control signals to the high voltage gate drive. A noise extraction circuit and technique obtain fast noise sampling to permit noise cancellation and adaptive noise reduction.

Abstract: A method for greatly reducing magnetic sound of an alternating current rotating machine compared with the past comprising superimposing an n?1-th order frequency in inverse turn and an m+1-th order magnetic sound reduction use harmonic current in the same turn on a multi-phase alternating current with reference to a basic frequency component of the multi-phase alternating current supplied to an armature of the alternating current rotating machine of multiple phases so as to reduce the n-th order, m-th order, and n+m-th order harmonic components of the basic frequency component among radial direction magnetic vibrating forces generated in the radial direction in a core of the alternating current rotating machine.

Abstract: A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around first and second outer legs, respectively; and first and second common-mode coils are wound around the inner leg of the choke. The first and second differential coils smooth the DC current on a DC bus in the motor drive, and the first and second common-mode coils suppress common-mode voltages in the motor drive. Also disclosed is a method for suppressing common-mode voltages in a motor drive.

Abstract: A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around first and second outer legs, respectively; and first and second common-mode coils are wound around the inner leg of the choke. The first and second differential coils smooth the DC current on a DC bus in the motor drive, and the first and second common-mode coils suppress common-mode voltages in the motor drive. Also disclosed is a method for suppressing common-mode voltages in a motor drive.

Abstract: A moisture detection system includes an electrical conductor disposed on a surface of a substrate. The electrical conductor has a resonant frequency that varies as a function of an amount of moisture present adjacent the electrical conductor. An oscillator outputs an oscillator signal at a predetermined amplitude and a predetermined frequency. A resonator circuit is coupled to the electrical conductor and is responsive to the oscillator signal and the resonant frequency of the electrical conductor for outputting a resonator signal having an amplitude related to the resonant frequency of the electrical conductor. A filter circuit rectifies and filters the resonator signal and provides it to an analog-to-digital converter which outputs a digital signal related to the rectified and filtered resonator signal. A controller is responsive to the digital signal for causing a system associated with the substrate to operate in accordance with the digital signal.

Abstract: An electric power assisted steering system is disclosed in which a torque demand signal (8) is generated and applied to an electric motor (1) operatively connected to a steering mechanism (5) in order to assist a driver of the vehicle when steering the vehicle. The torque demand signal (8) includes a damping component that is dependent upon a measurement of torque T carried by the steering mechanism and a measurement of the angular velocity &ohgr; of the steering mechanism. The torque produced by the motor (1) is not obtrusive during “hands-on” maneuvers but provides enhanced damping in other maneuvers such as a steering flick.

Abstract: A method and apparatus for use with an induction machine system including a controller and d and q-axis current feedback loops, the controller receiving a frequency command signal and generating d and q-axis voltage command signals, the method for limiting load current to a level below a limit current at low operating frequencies, the method comprising the steps of identifying an operating frequency as a function of the d and q-axis feedback currents, where the operating frequency is below a low threshold value: comparing a feedback current to the limit current; and where the feedback current exceeds the limit current, reducing the q-axis voltage command value.

Abstract: A motor drive and a choke therefor are disclosed, wherein the choke comprises a magnetic core with an inner leg and two outer legs, and four coils, which may be connected in DC current paths in the motor drive. First and second differential coils are wound around first and second outer legs, respectively; and first and second common-mode coils are wound around the inner leg of the choke. The first and second differential coils smooth the DC current on a DC bus in the motor drive, and the first and second common-mode coils suppress common-mode voltages in the motor drive. Also disclosed is a method for suppressing common-mode voltages in a motor drive.

Abstract: A system and method for damping of resonant peaks in an electric motor which is operated using a converter with an intermediate voltage circuit, by means of a matched impedance to ground at the motor star point, and a corresponding electric motor is disclosed. In a converter system having an intermediate voltage circuit which operates with a mains system input inductor in the step-up converter mode or has other input-side inductances, there is a risk of natural system oscillations being formed via discharge capacitances in conjunction with motors. If the motor now has an amplitude/frequency response with a pronounced resonant frequency in the region of such natural system oscillations, then there is a risk of higher voltages occurring at the motor star point than in the motor phases.

Abstract: In a converter system having an intermediate voltage circuit which operates with a supply network-side input inductor in the step-converter mode or has other input-side inductances, there is a risk of natural system oscillations being formed via discharge capacitances in conjunction with motors. If the motor now has an amplitude/frequency response with a pronounced resonant frequency in the region of such natural system oscillations, then there is a risk of higher voltages occurring at the motor star point (S) than in the motor phases (I, V, W). This is prevented by the present invention by introducing an impedance (Z), in particular at the input to the motor, in order to damp capacitive discharge currents to ground potential, which are caused by system oscillations (fsys) (excited asymmetrically with respect to ground in the motor phases (U, V, W)) of the converter system (LK, UR, LT, M) in the winding sections.

Abstract: Methods and apparatus for minimizing electrical machine vibration are described. In an exemplary embodiment of the method, power is applied to the motor under microprocessor control such that a pulse modulated current profile is applied to the motor which in turn controls the amount of torque generated by the motor. By adjusting current profiles, torque generation is controlled, and vibration and noise are eliminated.

Abstract: The present invention is a control method and numerical control for the vibration-reduced acceleration of a movable machine element of a numerically controlled industrial processing machine, in which a path of movement of the machine or machine element is broken down into directly successive interpolatable movement sections In the interpolation, resultant acceleration profiles which lie in a range close to a critical natural frequency of the machine or machine element are carried out with a reduced acceleration. By this method, intervention is made only in critical ranges of the acceleration profile, uncritical ranges remain uninfluenced, as a result of which drastic time losses during positioning can be avoided.

Abstract: A multiphase induction motor system is disclosed. The system comprises a motor having at least five phases and comprising a stator and a rotor. For each phase, the motor receives a command current to power the motor, where the command current has a fundamental frequency. A processor determines, for each phase, at least one harmonic component of a signal indicative of the fundamental frequency, generates a command current from the harmonic component and the fundamental frequency, and supplies the command current to the stator. A method for operating a multiphase induction motor system is disclosed. A first command current is supplied to a motor having at least five phases, where the first command current powers the motor. The first command current has a fundamental frequency, and the motor comprises a stator and a rotor. For each phase, at least one harmonic component of a signal indicative of the fundamental frequency is determined.