Inverter
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United States of America Patent
Stats
-
Jan 6, 1987
Grant Date -
N/A
app pub date -
Nov 30, 1983
filing date -
Nov 30, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A software-based inverter has a logic portion which is preferably made of LSIs. The inverter is therefore low-cost, yet provides a more efficient, precise and sophisticated operation for the inverter-motor combination. The inverter permits independent frequency and voltage application within the maximum and minimum voltage/frequency envelopes for a substantially optimal inverter-motor performance under a given load condition. The higher harmonics associated with the signal modulation are limited to a range between 0.9 kHz to 1.5 kHz with the center frequency at 1.2 kHz so that the harmonics are substantially attenuated by motor windings compared to the signal having a frequency range of 10 Hz-120 Hz, thereby resulting in higher efficiency and lower noise and vibration levels for the inverter-motor combination.
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