A motor flux weakening control method with data map creation is provided. The method estimates a phase angle between a dq electric current vector and a d-axis based on a speed of the motor; estimates an input direct current; repeats the estimating of the phase angle and the direct current while decreasing a magnitude of the dq electric current vector based on a difference between the estimated direct current and a preset direct current limitation value; and interrupts the repeating of the estimating of the phase angle and the estimating of the direct current when the direct current and the preset direct current limitation value are equal, and stores a relationship between the speed of the motor, the direct current voltage, the phase angle, and the magnitude of the dq electric current vector, when the estimated direct current and the preset direct current limitation value are equal.

Given a first intersection point of the surface of a rotor and a straight line that joins a central point of a permanent magnet on a stator side and a tooth tip section closest to the central point of the permanent magnet on the stator side, a flange is formed outward of an arc having, as the radius thereof, a distance from a second intersection point of the inner peripheral face of the stator and a straight line that joins the rotation axis of the rotor and the first intersection point, up to the tooth tip section.

Described is a method of controlling operation of a synchronous motor. The method comprises, during constant power/speed motor operation, determining a value of a stator voltage (v.sub.s.sup.2) for an orthogonal rotating reference frame of the motor. Comparing the value of the determined stator voltage (v.sub.s.sup.2) to a threshold voltage (v.sub.s.sup.2.sub._max1), said threshold voltage (v.sub.s.sup.2.sub._max1) having a value between that of a maximum stator voltage (v.sub.s.sup.2.sub._max0) for a basic speed mode of operation of the motor and that of a maximum stator voltage (v.sub.s.sup.2.sub._max2) of the motor closed loop controller. If the determined value of the stator voltage (v.sub.s.sup.2) is greater than or equal to the value of the threshold voltage (v.sub.s.sup.2.sub._max1), then controlling operation of the motor in a flux weakening mode of operation until a value of a current component (i.sub.d−Δi.sub.d) in a d-axis reaches a maximum negative value (−i.sub.dmax), or until the value of the stator voltage (v.sub.s.sup.2) is less than the value of the threshold voltage (v.sub.s.sup.2.sub._max1).

An electrical converter is interconnected via a filter with an electrical load or an electrical power source. A method for controlling the converter comprises the steps of: receiving a reference flux (ψ*.sub.i) for the electrical converter; determining output signals (y) comprising currents and/or voltages measured in the filter; determining an estimated flux (ψ.sub.i) from the output signals (y); determining a corrective flux (ψ.sub.i,damp) from the output signals (y) based on a mathematical model of the filter and a quadratic cost function; determining control input signals (u) for the electrical converter based on a sum of the estimated flux (ψ.sub.i) and the corrective flux (ψ.sub.i,damp); controlling the converter with the control input signals (u); and algorithmic filtering of at least one of the output signals (y) by applying a signal filter to the at least one output signal, which is designed for amplifying the at least one output signal at a resonance frequency of the filter, whereby the corrective flux (ψ.sub.i,damp) is determined from the filtered output signals.

A method for starting and stopping an asynchronous motor by way of a soft starter. The method includes the following steps: determining ignition options of one or more thyristors of the soft starter that are possible at a future calculation time; predicting the motor behavior for the determined ignition options, if an ignition of one or more thyristors of the soft starter is carried out; based on the predicted motor behavior, deciding whether an ignition option is to be selected and which is to be selected; and generating one or more ignition signals for one or more thyristors, if the decision for an ignition option has been made.

This disclosure features an apparatus including a motor controller to generate control signals to control an electric motor. The motor controller includes a first saturation controller to generate a first saturation controller output based on feedback signals associated with the electric motor. The motor controller further includes a duty ratio modulator coupled to the first saturation controller. The duty ratio modulator is configured to determine activation times for a set of voltage vectors based on the first saturation controller output. The motor controller is configured to generate, at each switching cycle, a control signal based on the set of voltage vectors and the activation times for the set of voltage vectors, and provide the control signal for controlling the electric motor.

A method of driving a permanent magnet synchronous motor (PMSM) with Field Oriented Control (FOC) includes: generating, by a current controller, control signals for driving motor currents of the PMSM; measuring, by the current controller, current information of the PMSM, including a direct-axis motor current and a quadrature-axis motor current; generating, by a direct-axis current controller, a direct-axis error value based on a difference between a flux weakening reference current and the direct-axis motor current; regulating, by the direct-axis current controller, a direct-axis motor voltage, including generating the direct-axis motor voltage based on the direct-axis error value; and generating and dynamically adapting, by a flux weakening controller, the flux weakening reference current based on changes to the motor load.

A hybrid turbocharger includes a first power conversion unit to convert a direct-current power into alternating-current power to be output to a generator motor, a smoothing capacitor between direct-current buses, and a control unit that controls the first power conversion unit so as to cause actual generator motor speed to comply with an engine speed command of the generator motor input from an upstream controller during a motoring operation of the generator motor. The control unit changes the engine speed command to a value which is equal to or greater than the actual generator motor speed if the engine speed command of the generator motor is less than the actual generator motor speed and a direct-current bus voltage is equal to or greater than a predetermined first threshold value during the motoring operation. Accordingly, the direct-current bus voltage can be prevented from increasing during the motoring operation.

The rotation of the synchronous reluctance motor is controlled through energization of the winding with current of a phase having a ratio k between the total sum of radial-direction widths of the slits on the q-axis and a magnetic gap length, and having a lead angle β from the d-axis. Among the core layers, the radial-direction width, on the q-axis, of the core layer that lies at a position closest in the circumferential direction to a point P at which there intersect the outer periphery of the rotor and the straight line passing through the rotor center and drawn at an angle ψ=arctan(tan β/(1+0.2k)) from the d-axis, is larger than the radial-direction width of other core layers on the q-axis.

To estimate a magnet magnetic flux or a magnet temperature with higher accuracy during a three-phase short circuit operation, than in a case only a d-axis current is used. A control device includes a phase short circuit unit for short-circuiting three-phase terminals of a permanent-magnet-type synchronous machine having a permanent magnet. During three-phase short circuit operation in which the three-phase terminals are short-circuited by the phase short circuit unit and the permanent-magnet-type synchronous machine is operated, the control device estimates a magnet state of the permanent magnet on the basis of a d-axis current, a q-axis current and a magnetic characteristic.