System and method for velocity control of a D.C. Motor
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United States of America Patent
Stats
-
Sep 22, 1998
Issued Date -
N/A
app pub date -
Jun 7, 1995
filing date -
Mar 16, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A system and method is disclosed for feedback velocity control of a D.C. motor. The system includes a motor (30) which is represented by its circuit equivalent--a series combination of an inductance (32), a resistor (34) and a back EMF source (36). The drive to the motor (30), supplied by a controller, is periodically inhibited by timing logic (22) and AND gate (20). Once the inductive transient decays via clamping diode (38) such that the motor current is zero, switch (40) is closed and the internally generated motor voltage is sampled by a capacitor (42). A/D converter (44) transforms the sampled value to a digital value and sends it to the controller. The controller compares it to a predetermined desired value then makes the necessary adjustments to the drive signal.
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