Thermoelectric power generation device and thermoelectric power generation method

Abstract

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.

Description

technical field [0001] This invention relates to the technical field of electric machines, and more particularly to the control of such machines. Background technique [0002] The principle of a synchronous machine, also known as a synchronous AC motor, is based on the interaction of two magnetic fields to generate a drive or resistive torque. One of these fields is called the rotor excitation field, since this field is associated with the rotor (the rotating part of the machine). The other field is called the stator field because this field is associated with the stator (the stationary part of the machine). Stator fields are caused by magnetic fluxes generated by phase-alternating currents flowing through the machine. The currents are controlled to produce a flux that is synchronous with respect to the rotor, ie rotates at the same speed as the rotor. Thus, the stator field is controlled in quadrature, ie controlled at a fixed 90° phase offset from the rotor field. Such...

AI Technical Summary

Problems solved by technology

If this determination is omitted or not performed correctly, the motor cannot produce any driving torque or may even produce a torque in the opposite direction from the desired direction, which may lead to undesirable and potentially dangerous effects

Images