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Title: Method and apparatus for sensorless operation of brushless permanent magnet motors

A sensorless method and apparatus for providing commutation timing signals for a brushless permanent magnet motor extracts the third harmonic back-emf of a three-phase stator winding and independently cyclically integrates the positive and negative half-cycles thereof and compares the results to a reference level associated with a desired commutation angle. 23 figs.
Authors:
Publication Date:
OSTI Identifier:
644392
Report Number(s):
US 5,739,652/A/
PAN: US patent application 8-770,862
DOE Contract Number:
AC36-83CH10093
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 14 Apr 1998
Research Org:
Midwest Research Institute
Sponsoring Org:
USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ELECTRIC MOTORS; PERMANENT MAGNETS; CONTROL THEORY; CONTROL SYSTEMS; SWITCHES; TIMING CIRCUITS