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: 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.

Abstract: The present invention relates to a method and a system for correcting references (xref), in the case of flux reduction, used in a speed variator for controlling an electric motor M having a three-phase supply, for example of the synchronous or asynchronous type. This method consists, in particular, of using a dynamic system (MM) representing a model of the motor to be controlled, provided with at least one integrator (Int) and having as input the difference between a limited value of a control voltage (u) to be applied to the motor (M) and the value of a calculated reference voltage (uref).

Abstract: The present invention relates to a method for limiting the current output by a speed controller (V) for three-phase asynchronous electric motor (M), said controller (V) operating according to a control law (LC) of pure U/F type. Said method is characterized in that it consists in calculating with the aid of a limitation function a correction value for the frequency of the stator (Wstat) then in applying thereto, so as to obtain, in the voltage control law (LC) of U/F type, a corrected frequency of the stator (Wstatc). According to the voltage control law of U/F type, the method thereafter consists on the basis of this corrected frequency of the stator (Wstatc) in obtaining the control voltage (Vqref) applied to the motor. The invention also relates to a system for limiting the current able to implement said method.

Abstract: The invention concerns a method for adjusting motor parameters in a variable speed drive intended to control an electric induction motor M. The method includes a step for determining differences ?ID and ?IQ between motor flux current and motor torque current references and measurements, a step for calculating a correction value ?RR of the rotor resistance and a correction value ?LR of the rotor inductance from the integral terms of the differences ?ID and ?IQ, a step for adjusting values of parameters of the motor model based on ?LR and ?RR, a step for generating control voltages UD and UQ to be applied to the motor M using said adjusted motor parameter values.

Abstract: The invention concerns a method for adjusting motor parameters in a variable speed drive intended to control an electric induction motor M. The method includes a step for determining differences ?ID and ?IQ between motor flux current and motor torque current references and measurements, a step for calculating a correction value ?RR of the rotor resistance and a correction value ?LR of the rotor inductance from the integral terms of the differences ?ID and ?IQ, a step for adjusting values of parameters of the motor model based on ?LR and ?RR, a step for generating control voltages UD and UQ to be applied to the motor M using said adjusted motor parameter values.

Abstract: The present invention relates to a method and a system for correcting references (xref), in the case of flux reduction, used in a speed variator for controlling an electric motor M having a three-phase supply, for example of the synchronous or asynchronous type. This method consists, in particular, of using a dynamic system (MM) representing a model of the motor to be controlled, provided with at least one integrator (Int) and having as input the difference between a limited value of a control voltage (u) to be applied to the motor (M) and the value of a calculated reference voltage (uref).

Abstract: The present invention relates to a method for limiting the current output by a speed controller (V) for three-phase asynchronous electric motor (M), said controller (V) operating according to a control law (LC) of pure U/F type. Said method is characterized in that it consists in calculating with the aid of a limitation function a correction value for the frequency of the stator (Wstat) then in applying thereto, so as to obtain, in the voltage control law (LC) of U/F type, a corrected frequency of the stator (Wstatc). According to the voltage control law of U/F type, the method thereafter consists on the basis of this corrected frequency of the stator (Wstatc) in obtaining the control voltage (Vqref) applied to the motor. The invention also relates to a system for limiting the current able to implement said method.