System for measuring motor rotor position

Details System for measuring motor rotor position System for measuring motor rotor position

2005-02-15

2005-02-15

Duda, Rina (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Hysteresis or reluctance motor systems

C318S254100, C318S700000, C318S715000, C318S720000, C318S721000

Reexamination Certificate

active

06856114

ABSTRACT:
The present invention relates to a method for the sensorless electric measurement of the position of a rotor of a permanently excited synchronous machine that is fed by a converter, by means of measuring signals which are sent to an evaluation device that calculates the electric position of the rotor from the angular dependence of the current space vector at an impressed stator flux pattern, wherein the distribution of absolute values of the differential current space vector varies in approximation in sinusoidal manner with twice the value of the electric rotor position angle sought. The method of the invention which can be used in particular in stationary or blocked machines is characterized in that the distribution of absolute values is produced from respectively two successive measurements for an almost inversed magnetization, in such a way that the superposition of the impressed stator flux and permanently excited rotor flux enables, due to saturation, a distribution of absolute values of the current space vector with two different maximum values, from which the electric rotor position angle sought is determined directly and unambiguously over 360°.

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Bruguier C et al: ‘ID-Model control of a synchronous motor without position and speed sensor’ Applied Power Electronics Conference and Exposition, 1995. APE '95. Conference Proceedings 1995, Tenth Annual Dallas, TX, USA Mar. 5-9, 1995, New York, NY, USA IEEE, US, pp. 387-391, XP010147613 ISBN: 0-7803-2482-X, p. 387; illustration 1.

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