Method of determining the position and the speed of a rotor in a synchronous electric machine using state observers

摘要

The invention is a method of determining the position and the speed of the rotor in a synchronous electric machine using a state observer of the currents of the electric machine and the injection of signals. Thus, the invention provides position information which is accurate, notably at low speed, without using a position detector. The invention also is a control method and system for controlling a synchronous electric machine which accounts for the position determined for the rotor.

主权项

1. A method for determining a position of a rotor of a salient-pole synchronous electric machine, wherein currents and voltages of phases of the electric machine are measured, comprising:
a) providing a voltage to the phases of the electric machine, the imposed voltage having an amplitude greater than a control voltage of the electrical machine and frequency greater than a control frequency of the electric machine; b) constructing a state model of a total magnetic flux circulating in the electric machine which is a function of the position of a rotor of the machine; c) constructing a state observer of currents and of speed of the rotor by using a state model of the total magnetic flux and the measured currents and the measured voltages; and d) determining the position of the rotor by using the state observer of speed and of the voltage.