Active current-limiting control for dc motor speed regulation
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United States of America Patent
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Apr 29, 2003
Grant Date -
Feb 27, 2003
app pub date -
Aug 23, 2001
filing date -
Aug 23, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A motor controller for regulating the speed and limiting the input current to a dc motor is disclosed. The motor controller includes an electronic control unit, a current sensor and a speed sensor. The motor controller provides control of the dc motor by applying a varying voltage to maintain a motor speed in the presence of a varying load. The motor controller also monitors the input current to the dc motor to predict an input current to the dc motor. The ECU compares the predicted input current to a input current limit range and switches to a current-limiting mode when it determines that an overcurrent condition is reached based on the comparison. The motor controller modifies the control signal by a first control decay factor when the predicted input current exceeds the input current limit range. The motor controller modifies the control signal by a second control decay factor when the predicted input current is within the input current limit range level. When the input current has stabilized less than the input current limit range, the motor controller modifies a target motor speed to returns to a speed-regulating mode.
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