Method and circuit arrangement for detecting rotation angles, without sensors, in a synchronous machine which preferably has permanent-magnet excitation and is fed by a converter

Abstract

Abstract The invention relates to detection of rotation angles, without sensors, in a synchronous machine by means of measurement signals which are sudden voltage changes generated by a converter. According to the invention, the rotor position is determined, by means of known complex calculation methods, by subtraction of two current rise measurements in which the same voltage space vector is present in both measurement elements, and in which case the stator current space vectors which are present on average during the two measurement elements must be sufficiently different that the stator inductance in this case differs noticeably on the basis of the different stator currents. The measured difference between the two current space vector rates of change is then, in consequence, a complex vector, whose real and imaginary parts oscillate at the rotor speed of revolution, so that the argument of this complex vector is uniquely related to the electrical position of the rotor. The advantage of the invention is not only its high accuracy but also that ambiguities relating to the rotor position determination are completely precluded.

Inventors

• 👤 Manfred Schroedl
• 👤 Richard Ensbacher

Bibliographic Details