Method and device for the regulation of permanent-magnet excited synchronous machine having reduced power oscillations in the higher rotational speed range
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Abstract
The invention concerns a method and an apparatus for field-oriented control of a permanent-magnet-excited synchronous machine. Conversion of an ascertained longitudinal voltage component and an ascertained transverse voltage component into triggering pulses for the synchronous machine is accomplished in a low rotation speed range using a pulse-width-modulated inverter, and in a high rotation speed range using a block switching mechanism or a software program functionally corresponding to a block switching mechanism. The invention reduces output oscillations in the upper rotation speed range that occur in known systems as a result of angular inaccuracies with respect to the target voltage zero transition and the voltage zero transition that is actually implemented.
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Citations
32 Claims
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1-12. -12. (canceled)
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13. A method for field-oriented control of a permanent-magnet-excited synchronous machine, comprising:
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ascertaining a longitudinal voltage component (ud) and a transverse voltage component (uq) of a control voltage; and
converting the ascertained longitudinal voltage component and the ascertained transverse voltage component into triggering pulses for the synchronous machine, the conversion of the ascertained longitudinal voltage component and the ascertained transverse voltage component into triggering pulses for the synchronous machine being performed, in a low rotation speed range, using a pulse-width-modulated inverter (7) and being performed, in a high rotation speed range, using a block switching mechanism (21) or a software program functionally corresponding to a block switching mechanism, as a function of the target angle (ε
) between the rotor pole axis and the target stator voltage space vector. - View Dependent Claims (15, 17, 19, 21, 22, 23)
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24. An apparatus for field-oriented control of a permanent-magnet-excited synchronous machine, comprising:
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circuit means (17, 18, 19;
1-5, 10-12) for ascertaining a longitudinal voltage component (ud) and a transverse voltage component (uq) of a control voltage;
first means (6, 7) for converting the ascertained longitudinal voltage component (ud) and the ascertained transverse voltage component (uq) into triggering pulses for the synchronous machine, said first means including a pulse-width-modulated inverter (7);
second means (20, 21) for converting the ascertained longitudinal voltage component (ud) and the ascertained transverse voltage component (uq) into triggering pulses for the synchronous machine, said second means including a block switching mechanism (21) or a software program functionally corresponding to a block switching mechanism and being provided for conversion as a function of the target angle (ε
) between the rotor pole axis and the target stator voltage space vector; and
a switchover unit (23) that makes available at its output, as a function of rotation speed, triggering pulses generated either by the pulse-width-modulated inverter (7) or by the block switching mechanism (21) or by the software program. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32)
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Specification