Compressor control system for a portable ventilator

a control system and portable technology, applied in the direction of electronic commutators, process and machine control, instruments, etc., can solve the problems of simple bldc motor controllers, low precision of speed control required in portable ventilator systems, and low accuracy of speed control loops, so as to achieve cost-effective and small packages
US20080092893A1Inactive Publication Date: 2008-04-24CAREFUSION 207 INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
CAREFUSION 207 INC
Publication Date
2008-04-24
Estimated Expiration
Not applicable · inactive patent

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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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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to and is a continuation of U.S. patent application Ser. No. 10 / 847,693, titled “Compressor Control System for a Portable Ventilator,” filed on May 18, 2004, which claims priority to U.S. Provisional Application No. 60 / 492,421, to Douglas F. DeVries, titled “Portable Ventilator,” filed on Aug. 4, 2003, the disclosures of which are hereby incorporated by reference in their entirety.BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] This invention relates to control systems for electric motors, more particularly to a control system for an electric motor used to drive a compressor in a portable ventilator.

[0004] 2. Background Art

[0005] For a variety of reasons, there are instances when individuals (patients) with acute and chronic respiratory distress cannot ventilate themselves (i.e. breathe). In those circumstances, such patients require breathing assistance to stay alive. One solution ...

Claims

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