Electricity: motive power systems – Automatic and/or with time-delay means – Speed or rate-of-movement
Reexamination Certificate
2007-06-05
2007-06-05
Ro, Bentsu (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
Speed or rate-of-movement
C324S178000
Reexamination Certificate
active
11379887
ABSTRACT:
AC motor control systems and speed controllers are presented, including a transient-based speed estimation system that provides a rotor speed estimate based on a measured speed-related motor transient signal, and a transient excitation system which selectively modifies at least one switch control signal to excite the measured motor transient. The measured speed-related transient may include a phase error signal, a phase lag signal, a peak current signal, a voltage integral signal, a motor winding voltage signal, a switching device voltage, and a voltage zero crossing signal, and the switching signal modification can comprise removal of select pulse(s) from a switching control pulse stream or selective modification of spacings between pulses to re-excite the motor transient.
REFERENCES:
patent: 5270632 (1993-12-01), Hirota et al.
patent: 5548197 (1996-08-01), Unsworth et al.
patent: 5744723 (1998-04-01), Piety
patent: 5828199 (1998-10-01), Tajima et al.
patent: 6414463 (2002-07-01), Griepentrog et al.
patent: 6640196 (2003-10-01), Unsworth et al.
patent: 6713978 (2004-03-01), Parlos et al.
patent: 7084604 (2006-08-01), Salomaki
patent: 2006/0192520 (2006-08-01), Yin et al.
patent: 2006/0192522 (2006-08-01), Kerkman et al.
A. Ferrah, P.J. Hogben-Iing, K.J. Bradley, G.M. Asher, and M.S. Woolfson, “The Effect of Rotor Design on Sensorless Speed Estimation Using Rotor Slot Harmonics Identified by Adaptive Digital Filtering Using the Maximum Likelihood Approach,” in Conf. Rec. IEEE-IAS Annual Meeting, No. 32, New Orleans, USA, Oct. 1997, pp. 128-135.
Michael W. Degner, Associate Member, IEEE, and Robert D. Lorenz, Fellow, IEEE, “Position Estimation in Induction Machines Utilizing Rotor Bar Slot Harmonics and Carrier-Frequency Signal Injection”, IEEE Transactions on Industry Applications, vol. 36, No. 3, May/Jun. 2000.
Jimmie J. Cathey, Ralph K. Cavin, III, A.K. Ayoub, “Transient Load Model of an Induction Motor”, IEEE Trans. on Power Apparatus and Systems, vol. 92, pp. 1399-1406, Jul./Aug. 1973.
Paul C. Krause, Oleg Wasynczuk & Scott D. Sudhoff, “Analysis of Electric Machinery”, ISBN 0-7803-1101-9, IEEE Press, New York, N.Y. 1995, pp. 298-303, 312, and 313.
Lu Haihui
Messersmith David M.
Nondahl Thomas A.
Gerasimow Alexander M.
Haas, Esq. Steven M.
Ro Bentsu
Rockwell Automation Technologies Inc.
LandOfFree
System and method for transient-based motor speed estimation... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for transient-based motor speed estimation..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for transient-based motor speed estimation... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3814093