Reduction of interference currents in a group of...

Details Reduction of interference currents in a group of... Reduction of interference currents in a group of...

2005-07-05

2005-07-05

Martin, David (Department: 2837)

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Synchronizing or phasing control

C318S629000

Reexamination Certificate

active

06914397

ABSTRACT:
The simultaneous generation of interference currents with the same polarity is prevented in all converters of connected drives, without adversely affecting the time slice synchronization or the uniformity of the dynamic characteristics. This is achieved by taking advantage of the symmetry of the modulation. The triangles of the sinusoidal/triangular modulation do not overlap as in conventional drives; instead, the triangles of one group, corresponding to approximately half the number of drives, are offset by 180°. With control processes operating with phasor modulation, the offset of 180° represents a shift of the switching sequence by interchanging the initial zero phasors and/or the modulation half intervals.

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