A blockage detector for detecting a blocked state of an electrical machine has: a first power determiner and a second power determiner for determining a first power consumption and a second power consumption of the electrical machine while a first phase voltage and a second phase voltage for operating at a first rotating field speed and a second rotating field speed are applied to the electrical machine, a quotient former for producing a power quotient between the first power consumption and the second power consumption; and a comparator for comparing the power quotient with a threshold value for the power quotient. The invention also relates to an inverter controller, an inverter, a drive, ventilation or air-conditioning system and a vehicle having a blockage detector according to the invention. In addition, the invention relates to a corresponding method for detecting a blocked state of an electrical machine.

A control device that controls a control target including at least a motor in a steering mechanism including an input shaft to which a steering wheel is connected, an output shaft connected to the input shaft via a torsion bar, and the motor connected to the output shaft. The control device includes a reaction force controller to generate an input torque input to the control target based on a torsion bar torque generated in the torsion bar and to control a reaction force transmitted from the steering wheel to the steering person, and an assist controller to generate a correction torque to correct the input torque based on an output of the control target and a nominal model. The assist controller is configured or programmed such that a transfer function of the control target is constrained by a transfer function of the nominal model in a frequency band.

A system for controlling anti jerk of an xEV vehicle using power of a motor, includes a battery configured to supply driving power to the motor, a battery control unit (BCU) configured to manage and control charging and discharging of the battery, and a motor control unit (MCU) configured to control driving of the motor, wherein the motor control unit is configured to execute a command for performing a method of controlling anti jerk of an xEV vehicle.

A variable frequency motor drive comprises a converter including a rectifier having an input for connection to an AC power source and converting the AC power to DC power. A DC bus is connected to the rectifier circuit. At least one bus capacitor is across the DC bus. An inverter receives DC power from the DC bus and converts the DC power to AC power to drive a motor. A controller is operatively connected to the converter. The controller comprises a speed control controlling the inverter responsive to a speed command to maintain a desired motor speed. A speed foldback control measures DC bus ripple voltage and regulates the speed command responsive to the measured DC bus ripple voltage.

A method is provided for controlling a multi-phase electric machine, wherein a stator of the electric machine includes a first sub-system and a second sub-system having the same number of phases and separate star points. The method includes controlling an inverter device by way of space vector modulation in order to generate output voltages for each of the phases, and outputting the output voltages as pulse sequences, wherein each of the pulse sequences in the second sub-system is output inverted with respect to respective pulse sequence in the first sub-system.

A method is provided for controlling a multi-phase electric machine, wherein a stator of the electric machine includes a first sub-system and a second sub-system having the same number of phases and separate star points. The method includes controlling an inverter device by way of space vector modulation in order to generate output voltages for each of the phases, and outputting the output voltages as pulse sequences, wherein each of the pulse sequences in the second sub-system is output inverted with respect to respective pulse sequence in the first sub-system.

A voltage saturation prevention algorithm used as at least part of a method of controlling an electric vehicle, wherein the electric vehicle comprises an electric motor, a controller, and an inverter. The controller receives a control signal with an instruction to operate the electric motor, then sends a switching signal corresponding to the control signal to the inverter, wherein the inverter provides a plurality of output signals for operation of the electric motor. The method includes determining the expected amplitude of the plurality of output signals based on the instruction to operate the electric motor, calculating the amount of modification of the plurality of output signals required to prevent the expected amplitude from reaching a saturation value, and modifying, based on the calculation, the instruction to operate the electric motor to prevent the expected amplitude from reaching the saturation value. The method is implemented in software, without any additional hardware.

A voltage saturation prevention algorithm used as at least part of a method of controlling an electric vehicle, wherein the electric vehicle comprises an electric motor, a controller, and an inverter. The controller receives a control signal with an instruction to operate the electric motor, then sends a switching signal corresponding to the control signal to the inverter, wherein the inverter provides a plurality of output signals for operation of the electric motor. The method includes determining the expected amplitude of the plurality of output signals based on the instruction to operate the electric motor, calculating the amount of modification of the plurality of output signals required to prevent the expected amplitude from reaching a saturation value, and modifying, based on the calculation, the instruction to operate the electric motor to prevent the expected amplitude from reaching the saturation value. The method is implemented in software, without any additional hardware.

A method for simulating a field-oriented stator voltage of a stator of an asynchronous machine required in the steady state during operation using a model, wherein the asynchronous machine is operated without a rotary encoder, in a field-oriented manner and with a graduated voltage, includes providing a field-oriented detected stator voltage. The method further includes providing a field-oriented detected stator current. The method further includes simulating the field-oriented stator voltage required in the steady state during operation on the basis of the field-oriented detected stator voltage and the field-oriented detected stator current.

A method includes capturing a first sample data signal, the first sample data signal being associated with a first time domain and storing a first value associated with the first sample data signal in a first element position of a first memory buffer. The method also includes generating, in response to a completion of a sampling window and in response to a request from a data consumer, a snapshot of values stored in the first memory buffer and storing the snapshot of values in a data consumer memory. The method also includes extracting, by the data consumer in a second time domain, at least one value from the snapshot of values and calculating, by the data consumer, at least one of a motor position of a motor and a motor velocity of the motor using the at least one value from the snapshot of values.