Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2008-12-22
2011-12-27
Ip, Paul (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S366000, C318S461000, C318S798000, C318S806000
Reexamination Certificate
active
08084984
ABSTRACT:
A system and method for measuring and controlling stator winding temperature in an AC motor while idling is disclosed. The system includes a circuit having an input connectable to an AC source and an output connectable to an input terminal of a multi-phase AC motor. The circuit further includes a plurality of switching devices to control current flow and terminal voltages in the multi-phase AC motor and a controller connected to the circuit. The controller is configured to activate the plurality of switching devices to create a DC signal in an output of the motor control device corresponding to an input to the multi-phase AC motor, determine or estimate a stator winding resistance of the multi-phase AC motor based on the DC signal, and estimate a stator temperature from the stator winding resistance. Temperature can then be controlled and regulated by DC injection into the stator windings.
REFERENCES:
patent: 3582712 (1971-06-01), Blair
patent: 3717804 (1973-02-01), Dikinis et al.
patent: 3774096 (1973-11-01), Hann
patent: 4083001 (1978-04-01), Paice
patent: 4135122 (1979-01-01), Holmquist et al.
patent: 4195324 (1980-03-01), Waltz
patent: 4355269 (1982-10-01), Burton et al.
patent: 5510687 (1996-04-01), Ursworth et al.
patent: 6163129 (2000-12-01), Younger et al.
patent: 6407529 (2002-06-01), Gritter et al.
patent: 6621291 (2003-09-01), Lee et al.
patent: 7193387 (2007-03-01), Lu et al.
patent: 7227326 (2007-06-01), Lu et al.
patent: 7298105 (2007-11-01), Lu et al.
patent: 7538507 (2009-05-01), Lu et al.
patent: 7570074 (2009-08-01), Gao et al.
patent: 2003/0034793 (2003-02-01), Lee et al.
patent: 2006/0250154 (2006-11-01), Gao et al.
patent: 2007/0216337 (2007-09-01), Lu et al.
patent: 2007/0247099 (2007-10-01), Lu et al.
patent: 2009/0051311 (2009-02-01), Lu et al.
Becker Scott K.
Habetler Thomas G.
Lu Bin
Luebke Charles John
Zhang Pinjia
Eaton Corporation
Ip Paul
Ziolkowski Patent Solutions Group, SC
LandOfFree
System and method for monitoring and controlling stator... 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 monitoring and controlling stator..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for monitoring and controlling stator... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4313442