Motor drive system for an electric mining shovel
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United States of America Patent
Stats
-
Apr 21, 1981
Grant Date -
N/A
app pub date -
Sep 29, 1978
filing date -
Sep 29, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A motor drive system for a mining shovel includes three a.c. motors which are driven by associated inverter circuits that receive power from a common d.c. bus. The d.c. bus connects to the a.c. power lines through a disconnect switch and a rectifier circuit and a chopper circuit is employed to dissipate power when the d.c. bus voltage rises due to motor regeneration. A power monitor and control circuit monitors the a.c. line voltage and the d.c. bus voltage and it controls the various system elements in such a manner as to maintain the d.c. bus voltage within an operating range. When the d.c. bus voltage cannot be maintained within the operating range, the disconnect switch is enabled to shut down the machine.
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