Renault S.a.s.

Nissan Motor Company Limited

Ampere S.a.s.

Edouard Negre

Abdelmalek Maloum

Ludovic Merienne

Mohamad Koteich

Thibaut Baumann

Bassel Assaad

Thanh Nguyen

Philippe Cotte

Thibault Baumann

A cooling system cools an electric machine including a casing, a rotor rotatably supported by the casing, and a stator fixed to the casing. The cooling system includes a flow circuit that brings a cooling liquid into contact with active parts of the electric machine. A main reservoir is provided in a lower portion of the casing. A pump injects the cooling liquid into the flow circuit. The level of cooling liquid in the casing interfaces with a lower portion of the rotor when the pump stops. A controller controls the pump to stop the pump when a temperature of the cooling liquid is below a given threshold, and start the pump as soon as the temperature of the liquid reaches the threshold such that the liquid is drawn by the main reservoir pump towards a secondary reservoir to lower the level of cooling liquid in the casing.

Cooling system for an electric machine

A control system for controlling power supply of an electric machine of an automobile and which contributes to movement thereof, wherein the control system is connected, at an input thereof, to a mechanism estimating a temperature of a rotor of the electric machine and to a temperature sensor measuring a temperature of a stator of the electric machine. The control system includes mappings of a set of values for allocating supply currents of the electric machine on the basis of torque and rotational speed request values received at the input of the control system, and includes a switching mechanism for selecting the mapping, the supply current signals of which are transmitted to the electric machine, on the basis of the signals from the mechanism estimating the temperature of the rotor and from the stator-temperature sensor.

System and method for controlling the power supply of an electric machine on the basis of the temperature thereof

The invention relates to a method for determining the angular offset between the rotor and the stator of an electrical machine for driving a motor vehicle, the rotor being supplied with a rotor-energizing current and voltage, the stator being supplied over three phases with stator-phase currents and voltages, wherein the method includes the following steps: verifying that the electrical machine is stopped; applying a rotor-energizing signal for an amount of time capable of causing the partial magnetization of the rotor; applying a rotor-de-energizing signal capable of causing an active and rapid demagnetization of the rotor, while measuring, during the magnetization, the stator-phase currents and maintaining zero voltage among the phases of the stator; determining the direct stator currents and quadrature stator currents corresponding to the stator-phase currents measured by applying Park and Clarke transforms and in accordance with a measurement of the electrical position of the rotor; determining the maximum values among the direct and quadrature stator currents; transmitting an angular offset fault signal if the absolute value of the maximum quadrature stator signal is greater than a threshold value; determining a correction of the angular offset in radians by calculating the tangent arc of the maximum quadrature stator current value divided by the maximum value of the direct stator current.

Method for determining the angular offset between the rotor and the stator of an electrical machine of a motor vehicle

A system for controlling an automotive vehicle three-phase electric machine supplied via chopped voltages, including: a mechanism determining settings of current of phases of the electric machine as a function of a torque request from a driver; a regulating mechanism to determine voltages of each phase as a function of corresponding settings of current; a mechanism correcting torque oscillations, which can determine powers of each phase, to determine whether speed of rotation of the magnetic field exceeds a threshold value, to carry out a bandpass filtering of the powers, and to determine attenuation currents relating to each phase as a function of the post-filtering powers; subtractors configured to subtract the attenuation currents relating to each phase from the settings of current of the corresponding phases, destined for the regulating mechanism.

Method and system for controlling an automotive vehicle three-phase electric machine supplied via chopped voltages

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Montigny le Bretonneux, France

Edouard Negre