COMPRESSOR CONTROL SYSTEM FOR A PORTABLE VENTILATOR
2 Assignments
0 Petitions
Accused Products
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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Citations
69 Claims
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1-35. -35. (canceled)
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36. A portable ventilator apparatus comprising:
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a compressor disposed within the portable ventilator;
a brushless direct current (BLDC) motor, said compressor driven by said BLDC motor;
a plurality of sensors disposed within the portable ventilator that provide a plurality of analog signals, said plurality of analog signals representative of an angular position of said BLDC motor;
a computation circuit disposed within the portable ventilator and in communication within the plurality of sensors configured to compute said angular position of said BLDC motor from said plurality of analog signals; and
a speed control servo disposed within the portable ventilator and in communication with said BLDC motor for driving an angular speed of the BLDC motor to a command speed provided to said computation circuit. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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50. A portable ventilator apparatus comprising:
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a compressor disposed within the portable ventilator;
a brushless direct current (BLDC) motor, said compressor driven by said BLDC motor;
a plurality of sensors disposed within the portable ventilator that provide a plurality of analog signals, said plurality of analog signals representative of an angular position of said BLDC motor;
a computation circuit disposed within the portable ventilator and in communication with the plurality of sensors configured to compute an angular speed of said BLDC motor from said plurality of analog signals; and
a speed control servo disposed within the portable ventilator and in communication with said BLDC motor for driving said angular speed of the BLDC motor to a command speed provided to said computation circuit. - View Dependent Claims (51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62)
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63. A portable ventilator apparatus comprising:
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a compressor disposed within the portable ventilator;
a brushless direct current (BLDC) motor, said, compressor driven by said BLDC motor;
a plurality of sensors disposed within the portable ventilator that provide a plurality of analog signals, said plurality of analog signals representative of an angular position of said BLDC motor;
a computation circuit disposed within the portable ventilator and in communication with the plurality of sensors configured to compute an angular speed of said BLDC motor from said plurality of analog signals; and
a speed control servo disposed within the portable ventilator and in communication with said BLDC motor for driving said angular speed of the BLDC motor to a command speed provided in said computation circuit. - View Dependent Claims (64, 65, 66, 67, 68, 69)
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Specification