COMPRESSOR CONTROL SYSTEM FOR A PORTABLE VENTILATOR
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United States of America Patent
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N/A
Issued Date -
Apr 24, 2008
app pub date -
Oct 23, 2007
filing date -
Aug 4, 2003
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method and apparatus for controlling a brushless DC (BLDC) motor over a wide range of angular speeds is presented. Analog magnetic sensors provide continuous signal measurements related to the rotor angular position at a sample rate independent of rotor angular speed. In one embodiment, analog signal measurements are subsequently processed using an arctangent function to obtain the rotor angular position. The arctangent may be computed using arithmetic computation, a small angle approximation, a polynomial evaluation approach, a table lookup approach, or a combination of various methods. In one embodiment, the BLDC rotor is used to drive a Roots blower used as a compressor in a portable mechanical ventilator system.
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