Patent · US Active

Position sensing for rotor in hybrid stepper motor

US7911174B1 · kind B1 · utility

2Cited by

18References

11Claims

0Family size

Assignee

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventors

David E. Howard · Hazel Green, US
Dean C. Alhorn · Huntsville, US
Dennis A. Smith · Athens, US

Key dates

Filing date	Feb 28, 2008
Grant date	Mar 22, 2011
Priority date	—
Expiry date	Jan 25, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH02P8/34
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A method and system are provided for sensing the position of a rotor in a hybrid stepper motor. First and second Hall sensors are positioned in a spaced-apart relationship with the first and second armatures of the rotor such that the first and second Hall sensors generate electrical outputs that are 90° out of phase with one another as the rotor rotates. The electrical outputs are adjusted relative to a reference, and the amplitude of the electrical outputs is further adjusted to account for spacing differences between the rotor and each of the first and second Hall sensors.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.