Position-and-velocity sensorless control for starter generator electrical ...

United States Patent [19]

Rozman et al.

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US005495162A

[ii] Patent Number: 5,495,162 [45] Date of Patent: Feb. 27, 1996

[54] POSITION-AND-VELOCITY SENSORLESS CONTROL FOR STARTER GENERATOR ELECTRICAL SYSTEM USING GENERATOR BACK-EMF VOLTAGE

[75] Inventors: Gregory I. Rozman, Rockford; Albert L. Markunas, Roscoe; Michael J. Hanson, Loves Park; Leland E. Weber, Rockford, all of 111.

[73] Assignee: Sundstrand Corporation, Rockford, 111.

[21] Appl. No.: 61,363

[22] Filed: May 12, 1993

[51] Int. CI.6 F02N 11/04

[52] U.S. CI 322/10; 322/20; 290/39

[58] Field of Search 322/10; 290/31;

310/156; 318/254

[56] References Cited

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Primary Examiner—Steven L. Stephan

Assistant Examiner—Nicholas Ponomarenko

Attorney, Agent, or Firm—Marshall, O'Toole, Gerstein,

Murray & Bicknell

A detector for detecting rotor position of a brushless generator having a motive power shaft, a permanent magnet generator (PMG) having a set of armature phase windings and a main generator portion having a set of armature phase windings includes a circuit coupled to the armature phase windings of the main generator portion for deriving a number of interval pulses per revolution of the motive power shaft. A circuit measures time periods between adjacent interval pulses and the measured time periods are converted into an indication of the angular position of the motive power shaft in accordance with a parameter of power delivered to the main generator portion armature phase windings.

28 Claims, 8 Drawing Sheets

Page 2

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