System and method for identifying operational parameters of a motor

Illllllllllllllllllllllllllllllllllllllllllllllllll

US007135830B2

(12) United States Patent

El-Ibiary

(io) Patent No.: (45) Date of Patent:

US 7,135,830 B2 Nov. 14, 2006

(54) SYSTEM AND METHOD FOR IDENTIFYING OPERATIONAL PARAMETERS OF A MOTOR

(75) Inventor: Yehia El-Ibiary, Simpsonville, SC (US)

(73) Assignee: Reliance Electric Technologies, LLC,

Mayfield Heights, OH (US)

( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 85 days.

(21) Appl. No.: 10/675,723

(22) Filed: Sep. 30, 2003

(65) Prior Publication Data

US 2005/0067991 Al Mar. 31, 2005

(51) Int. CI.

G0SB 13/00 (2006.01)

(52) U.S. CI 318/561; 318/560; 318/569

(58) Field of Classification Search 318/727,

318/798, 807, 700, 690, 715, 721, 801, 490, 318/565; 340/648,682; 324/551,772; 702/58, 702/145, 64, 115, 59, 60, 38, 34, 56, 44 See application file for complete search history.

(56) References Cited

U.S. PATENT DOCUMENTS

5,345,158 A 9/1994 Kliman et al 318/434

5,548,199 A * 8/1996 Bidaud et al 318/802

5,569,994 A * 10/1996 Taylor et al 318/700

5,680,025 A * 10/1997 Bowers et al 318/806

5,726,911 A * 3/1998 Canada et al 702/32

5,739,698 A * 4/1998 Bowers et al 324/772

5,834,918 A * 11/1998 Taylor et al 318/601

5,852,351 A * 12/1998 Canada et al 318/490

5,998,958 A * 12/1999 Lee 318/801

6,002,234 A * 12/1999 Ohm et al 318/729

6,042,265 A * 3/2000 Kliman et al 374/152

6,124,692 A * 9/2000 Canada et al 318/490

6,138,078 A * 10/2000 Canada et al 702/44

6,144,924 A * 11/2000 Dowling et al 702/60

6,199,018 Bl * 3/2001 Quist et al 702/34

6,236,947 Bl * 5/2001 Dowling et al 702/38

6,262,550 Bl* 7/2001 Kliman et al 318/565

6,281,659 Bl* 8/2001 Giuseppe 318/799

6,295,510 Bl* 9/2001 Discenzo 702/183

6,297,742 Bl * 10/2001 Canada et al 340/635

6,308,140 Bl * 10/2001 Dowling et al 702/60

6,346,810 Bl * 2/2002 Cho et al 324/244.1

6,356,044 Bl* 3/2002 Archer 318/538

6,373,211 Bl* 4/2002 Henry et al 318/432

6,393,373 Bl * 5/2002 Duyar et al 702/115

6,434,512 Bl* 8/2002 Discenzo 702/184

(Continued)
OTHER PUBLICATIONS

Fundamentals of Electric Drives, Mohamed A. El-Sharkawi, University of Washington, 2000.

Primary Examiner—Paul Ip

(74) Attorney, Agent, or Firm—Patrick S. Yoder; Alexander M. Gerasimow

A system and method for establishing estimated values of electrical parameters of a motor. The electrical parameters may be established from stator resistance data and motor data obtained at a single load on the motor. The electrical parameters also may be established without stator resistance data by using motor data at three load conditions of the motor. The electrical parameters also may be established from baseline motor data and motor data obtained at a desired operating load of the motor. Based on the estimated values, the system and method also may be used to estimate motor operating parameters, such as torque, efficiency, output power, output speed, and other performance criteria of the motor.

66 Claims, 9 Drawing Sheets