Abstract: The invention relates to a control method for minimizing the electrical energy consumed during a process of filling or draining a tank (R), said process of filling or draining the tank being implemented using a pumping equipment item (EP) which comprises at least one pump, said filling or draining process being performed in the presence of a disturbing flow (Qc) draining the tank or respectively filling the tank, said method consisting in determining an optimum speed (?opt) of the pumping equipment item that minimizes the electrical energy consumed by the pumping equipment item during the process of filling or draining the tank (R).

Abstract: A method for connecting a second motor to a variable speed drive in parallel with at least one existing motor under load and controlled by the variable speed drive is provided. The method disconnects the existing motor from the variable speed drive and a state estimator calculates transient state of the existing motor including at least the speed of the existing motor based on a previously established load model. The method then connects the second motor to the variable speed drive and the second motor is operated using a suitable directive until the actual state of the second motor attains the calculated transient state of the existing motor at a given time. Upon attaining the calculated transient state, the existing motor is reconnected to the variable speed drive such that no current spike is generated in the aforementioned process.

Abstract: The invention relates to a method of control implemented in a variable speed drive for controlling the deceleration of an electric motor (M) in the case of electrical power outage. The method of control comprises: a step of determining the Joule-effect losses to be applied to the electric motor (M) and to the variable speed drive according to a deceleration ramp to be applied to the electric motor (M) during an electrical power outage, a step of determining the flux reference (?ref) as a function of the said Joule-effect losses to be applied to the electric motor (M) and to the variable speed drive.

Abstract: A control method to be implemented in a power converter, the power converter including an inverter module controlled by a control rule that makes it possible to determine a control voltage to be applied to an electrical load on the basis of a reference control voltage. The control method includes determining a correction value to be applied to the reference control voltage, the correction value being determined from a first filtered voltage obtained by filtering a voltage that is representative of the real measured voltage, and a second filtered voltage obtained by filtering a voltage that is representative of the reference control voltage.

Abstract: A control method implemented in a power converter including an inverter connected to a synchronous electric motor including permanent magnets, the electric motor being modeled in the power converter by a mathematical model of currents in the electric motor expressing a flux current and a torque current on the basis of magnetic-saturation parameters. The control method identifies magnetic-saturation parameters during a learning procedure including applying a static voltage signal and a high-frequency voltage signal along an axis of the flux and/or an axis of the torque of the motor to cause an oscillation of the current on the axis of the flux and/or on the axis of the torque.

Abstract: A control method implemented in a variable speed drive for controlling a lifting load, the load control being carried out according to a first control profile that includes the following: accelerating the load with a view to reaching a first speed, decelerating the load upon receiving a deceleration order, and stopping the load. When the load receives a deceleration order when it is at a current speed lower than the first speed, the method determines a second speed lower than the first speed and higher than the current speed, the second speed having an optimal value for minimizing the load running time until stopping.

Abstract: The invention relates to a method and a system for controlling a centrifugal pump (1) actuated by an electric motor (2). The control method comprises: a first step of selecting a speed and of controlling the variable speed drive (3) in order to apply said speed to the electric motor (2), a second step of controlling the solenoid valve (6) over the whole of its operating range at said selected speed, a third step of measuring the pressure and the flow rate of the fluid flowing in the pumping circuit and of measuring the electric power supplied to the motor for each operating point of the solenoid valve (6), a fourth step of determining, for said selected speed, the pressure curve as a function of the flow rate and the curve of the power supplied as a function of the flow rate.

Abstract: A method of controlling a multilevel inverter of NPC (Neutral Point Clamped) type. The method includes regulating the electrical potential of the mid-point when the inverter operates at full voltage, that is to say in overmodulation. In this case, the method firstly determines the position of the control voltage vector in one of the six identical triangles covering the hexagonal vector space and thereafter decomposes the control voltage vector in the triangle by taking account of control combinations, defined in this triangle, for the switching arms.

Abstract: The invention relates to a control method implemented in a variable speed drive for determining the inductances (Ld, Lq) of a permanent magnet synchronous machine comprising three phases (a, b, c), each oriented along a direction, a stator, and a rotor. For each phase, one after the other, said method includes steps of: applying, along the direction of the phase (a, b, c), a voltage vector (V1, V3, V5) in the positive direction and a voltage vector (V2, V4, V6) in the negative direction for a predetermined duration; measuring the current obtained in the phase after applying the voltage vectors in both directions; determining an angle (?r) for the position of the rotor in relation to the stator based on the measured current; and determining the flow (Ld) and torque (Lq) inductances of the machine based on the predetermined angle (?r).

Abstract: A method for connecting a second motor to a variable speed drive in parallel with at least one existing motor under load and controlled by the variable speed drive is provided. The method disconnects the existing motor from the variable speed drive and a state estimator calculates transient state of the existing motor including at least the speed of the existing motor based on a previously established load model. The method then connects the second motor to the variable speed drive and the second motor is operated using a suitable directive until the actual state of the second motor attains the calculated transient state of the existing motor at a given time. Upon attaining the calculated transient state, the existing motor is reconnected to the variable speed drive such that no current spike is generated in the aforementioned process.

Abstract: The invention relates to a method of control implemented in a variable speed drive for controlling the deceleration of an electric motor (M) in the case of electrical power outage. The method of control comprises: a step of determining the Joule-effect losses to be applied to the electric motor (M) and to the variable speed drive according to a deceleration ramp to be applied to the electric motor (M) during an electrical power outage, a step of determining the flux reference (?ref) as a function of the said Joule-effect losses to be applied to the electric motor (M) and to the variable speed drive.

Abstract: The invention relates to a method for determining the position of a rotor flux vector of an electric motor (M), comprising a step of injecting a first current vector into a first reference frame (x+, y+) rotating at a first frequency (?) relative to a reference frame (d, q) synchronous with the rotation of the motor, and a second current vector into a second injection reference frame (x?, y?) rotating at a second frequency opposite to the first frequency, a step of determining a first stator flux induced voltage delivered at the output of a first integrator module (12) synchronous with the first reference frame (x+, y+) and a second stator voltage delivered at the output of a second integrator module (13) synchronous with the second reference frame (x?, y?), a step of regulating the position of the rotor flux vector by minimizing the error (?) between a real position and an estimated position (?S) of the rotor flux vector, the error being determined based on the second induced voltage.

Abstract: The invention relates to a method of controlling a multilevel inverter of NPC (Neutral Point Clamped) type. The method consists in particular in regulating the electrical potential of the mid-point when the inverter operates at full voltage, that is to say in overmodulation. In this case, the method firstly consists in determining the position of the control voltage vector (U) in one of the six identical triangles covering the hexagonal vector space and thereafter in decomposing the control voltage vector (U) in the triangle by taking account of the control combinations, defined in this triangle, for the switching arms.

Abstract: A method implemented in a speed controller to detect a loss of one phase, two phases or three phases in a three-phase permanent-magnet synchronous motor, running or stopped at rest, said controller executing a control in closed loop operation, said method including: determining, with the speed controller, a reference flux current as a function of a reference torque current, said reference torque current being calculated from a reference speed applied to the motor and a measurement of the speed or the position carried out on the motor; applying, with the speed controller, the reference flux current and injecting currents over various phases of the motor; and measuring, with the speed controller, the currents over at least two phases and determining the loss of one phase, of two phases or of three phases from these measured currents.

Abstract: A control method implemented in a variable speed drive for controlling a lifting load, the load control being carried out according to a first control profile that includes the following: accelerating the load with a view to reaching a first speed, decelerating the load upon receiving a deceleration order, and stopping the load. When the load receives a deceleration order when it is at a current speed lower than the first speed, the method determines a second speed lower than the first speed and higher than the current speed, the second speed having an optimal value for minimizing the load running time until stopping.

Abstract: The invention relates to a control method implemented in a variable speed drive for determining the inductances (Ld, Lq) of a permanent magnet synchronous machine comprising three phases (a, b, c), each oriented along a direction, a stator, and a rotor. For each phase, one after the other, said method includes steps of: applying, along the direction of the phase (a, b, c), a voltage vector (V1, V3, V5) in the positive direction and a voltage vector (V2, V4, V6) in the negative direction for a predetermined duration; measuring the current obtained in the phase after applying the voltage vectors in both directions; determining an angle (?r) for the position of the rotor in relation to the stator based on the measured current; and determining the flow (Ld) and torque (Lq) inductances of the machine based on the predetermined angle (?r).

Abstract: A method and a system for controlling an asynchronous electric motor for detecting cabling errors between the electric motor and a motor starter. The electric motor including three windings distributed over three branches in a delta configuration and controlled by the motor starter, which includes power semiconductors directly connected in series within the three branches of the delta configuration of the three windings. In one embodiment, the method includes applying a voltage in a first branch of the delta, priming the semiconductor of the first branch after a priming delay, measuring an electrical current generated within the first branch during the priming, and determining the configuration of the cabling of the first branch according to the measured electrical current.

Abstract: The invention relates to a method for determining the position of a rotor flux vector of an electric motor (M), comprising a step of injecting a first current vector into a first reference frame (x+, y+) rotating at a first frequency (?) relative to a reference frame (d, q) synchronous with the rotation of the motor, and a second current vector into a second injection reference frame (x?, y?) rotating at a second frequency opposite to the first frequency, a step of determining a first stator flux induced voltage delivered at the output of a first integrator module (12) synchronous with the first reference frame (x+, y+) and a second stator voltage delivered at the output of a second integrator module (13) synchronous with the second reference frame (x?, y?), a step of regulating the position of the rotor flux vector by minimizing the error (?) between a real position and an estimated position (?S) of the rotor flux vector, the error being determined based on the second induced voltage.

Abstract: The invention relates to a method of adjusting motor parameters in a variable speed drive intended for controlling a synchronous electric motor with permanent magnets M. The method comprises a step of determining the deviations ?ID and ?IQ between references and measurements of the flux current and motor torque current, a step of calculating a correction value ?RS of the stator resistance, a correction value ?L of the inductance and a correction value ?KE of the flux constant of the motor, on the basis of the integral terms of the deviations ?ID and ?IQ, a step of adjusting the values of the parameters of the motor model on the basis of ?RS, ?L and ?KE, a step of formulating the control voltages UD and UQ to be applied to the motor M by using the said adjusted values of the motor parameters.

Abstract: The present invention relates to a method implemented in a speed controller (1) to detect a loss of one phase, two phases or three phases in a three-phase permanent-magnet synchronous motor (PMSM), running or stopped at rest, said controller executing a control in closed loop operation. The method consists in applying a reference flux current (Idref) in the control of the speed controller (1) and in determining the loss of one or more phases according to different criteria.