Motor driving apparatus including a modularized current control circuit and method of controlling the same
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United States of America Patent
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Feb 27, 2001
Grant Date -
N/A
app pub date -
Jan 24, 2000
filing date -
Jan 25, 1999
priority date (Note) -
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Abstract
In a controller, for use in an electric motor, which self-contains a current control system, a conducting portion of a feedback element from a current detector up to a summing point, and a conducting portion of a forward element from the summing point for the current control up to a gate terminal of each of switching devices are mounted in a power module to be hermetically encapsulated without being exposed to the external ambient atmosphere. The distributed processing is executed in the two portions, i.e., a current control loop, and a position control unit, a velocity control unit and an interface processing unit other than the current control loop. Therefore, the current control loop including the current feedback portion is constituted by another sub-microprocessor to be mounted together with the associated devices in a power module which is molded with resin such as epoxy resin.
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