A microcomputer includes a current command value setting unit configured to set a two-phase current command value in a two-phase rotating coordinate system for each of PWM cycles in a current control cycle, and an open-loop control unit configured to calculate a two-phase voltage command value for each of the PWM cycles, according to a motor voltage equation, based on the two-phase current command value for each of the PWM cycles that is set by the current command value setting unit and a rotation speed of an electric motor. The two-phase voltage command value is a command value of voltage that is to be applied to the electric motor.

An actual rotation speed of the asynchronous motor is detected according to the given rotation speed thereof. A given voltage of the asynchronous motor is obtained according to a vector control algorithm and a PI-IP control algorithm and is used as a reference output voltage of the BBMC. A duty cycle of a power switch tube in the BBMC is obtained according to a finite-time control algorithm by taking capacitor voltages and inductor currents in the BBMC as control variables of the speed regulation system. The conducting time of the power switch tube in the BBMC is controlled according to the duty cycle and an output control signal of a corresponding switching cycle, so that an output voltage consistent with its reference output voltage is obtained at an output end of the BBMC, so that the actual rotation speed of the asynchronous motor accurately tracks the given speed.

An apparatus for controlling an electric motor having a controller, a torque demand limit generator, and a drive stage. The controller may be arranged to receive as an input a torque demand signal indicative of the amount of torque demanded from the motor and to produce as an output a set of motor current demand signals. The drive stage may receive the motor current demand signals and is arranged to cause currents to flow in each phase of the motor as required to meet the demanded torque. The torque demand limit generator may be arranged to output a torque demand limit signal indicative of a torque demand limit above which the battery current would exceed one or more limits.

An actual rotation speed of the asynchronous motor is detected according to the given rotation speed thereof. A given voltage of the asynchronous motor is obtained according to a vector control algorithm and a PI-IP control algorithm and is used as a reference output voltage of the BBMC. A duty cycle of a power switch tube in the BBMC is obtained according to a finite-time control algorithm by taking capacitor voltages and inductor currents in the BBMC as control variables of the speed regulation system. The conducting time of the power switch tube in the BBMC is controlled according to the duty cycle and an output control signal of a corresponding switching cycle, so that an output voltage consistent with its reference output voltage is obtained at an output end of the BBMC, so that the actual rotation speed of the asynchronous motor accurately tracks the given speed.

A motor is stably driven under an extremely low temperature. A control unit controls an inverter to extract a pulse-like direct current from a battery, in case where a temperature Temp of the battery is below a predetermined value TH at which a power that can drive a motor is continuously extractable, by cyclically repeating an on-period to extract the direct current that can drive the motor from the battery and an off-period in which, after the on-period, the power is not extracted from the battery until the direct current that can drive the motor becomes extractable from the battery again. The inverter converts, to a phase current, the direct current extracted from the battery in the on-period.

A low-frequency torque controller 9 outputs a low-frequency torque controller output .sub.dc* based on a torque command value * and a torque detection value .sub.det, and a vibrational torque controller 11 outputs a vibrational torque command value .sub.pd* based on the torque command value *, the torque detection value .sub.det, and a rotational phase detection value . Meanwhile, in a high-frequency resonance suppression controller, an inverter torque command value .sub.inv* is outputted based on the torque detection value .sub.det and a corrected torque command value .sub.r* obtained by adding the low-frequency torque controller output .sub.dc* to the vibrational torque command value .sub.pd*. The invention thus provides shaft torque vibrational control of a motor drive system wherein engine vibrational torque command values including distortion components are tracked while entirely removing the influence of resonance, non-periodic disturbances, and periodic disturbances.

A motor control system includes a motor, a motor control apparatus that drives the motor and includes a first communication port and a second communication port, an upper-level control apparatus connected to the first communication port via a first communication path, an interface connected to the second communication port via a second communication path, and one or more detectors that detect information for controlling the motor and are connected to or including the interface. The motor control apparatus includes processing circuitry that obtains the information detected by the detector and exchanged between the upper-level control apparatus and the interface, and controls the motor based on the obtained information.

A method operates a steering device which comprises at least one electric motor that can be operated with an increased torque lying between a nominal torque of the electric motor and a maximum torque of the electric motor over an entire basic setting range. In at least one operating state, a threshold torque of the electric motor is at least temporarily limited to a reduced torque, in particular in comparison to the maximum torque, at least depending on at least one temperature characteristic variable.

A manual operating element for operating an electrically adjustable piece of furniture includes a handle body comprising a mounting body, a handle section connected to the mounting body and an elastic member operatively connected to the handle section. The mounting body is adapted to be attached to a component of the piece of furniture. The handle section is adapted for gripping by a user. A force sensor is operatively connected to the elastic member and serves to detect a directional force value corresponding to a force applied to the handle section. A touch sensor is used to detect a touch value as a function of the user touching the handle section. A communication unit is arranged to transmit the force value and the touch value or a signal derived from the force value and the touch value to a controller of the piece of furniture.

For predicting a load pattern, a method determines a torque error from a torque reference modified by a low pass filter function of the torque reference. The torque reference is one of measured from an induction machine energized by a flux current and a torque current and calculated in an induction machine controller. The method determines a torque increase pulse in response to a torque relative variation calculated from the torque error exceeding an increase threshold. In response to detecting the torque increase pulse, the method determines a change delay time from the torque relative variation and the torque increase pulse. The method further determines a change period from at least two torque increase pulses. The method increases the flux current before a change time that is predicted as a function of the change delay time and the change period.