Variable voltage switched current control
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United States of America Patent
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Nov 16, 1993
Grant Date -
N/A
app pub date -
Apr 13, 1992
filing date -
Apr 13, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Provision of a digital controller in which the controller controls the bearing coil current by means of a switching bridge that periodically reverses the applied voltage to the coil. The controller selects an applied voltage from a plurality of discrete voltage sources. When a rapid change in the load current is required, a relatively large magnitude of applied voltage is used. When a relatively constant magnitude of average load current is required, a relatively smaller value of voltage is applied.
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