Speed computation function for induction motor/blower systems control algorithm
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United States of America Patent
Stats
-
Mar 5, 2002
Grant Date -
N/A
app pub date -
Oct 18, 2000
filing date -
Oct 19, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method for controlling an induction motor having a variable frequency drive in a blower system so that the blower system provides a specific fluid flow. A start-up program causes the motor to ramp up to approximately a predetermined steady state speed. A required blower torque is calculated by operating on a table of blower constants, a selected flow rate and a motor speed. The motor speed is calculated by operating on a table of motor specific constants, a voltage-frequency index and a measured direct current bus current. A developed motor torque is calculated by operating on a table of motor specific constants, a voltage-frequency index and the calculated motor speed. The calculated required blower torque is repeatedly compared with the calculated developed motor torque. The voltage-frequency index to the variable frequency drive is modified to force the developed motor torque to converge with the required blower torque in a steady state.
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