Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
2005-06-14
2005-06-14
Nappi, Robert (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S132000, C318S254100, C318S430000, C318S432000, C318S434000, C360S069000, C360S077020, C360S077030, C360S077040, C360S077050, C360S077060, C360S077070, C360S077080
Reexamination Certificate
active
06906485
ABSTRACT:
Method and apparatus for operating a motor. During a commutation state current is applied to a motor while field effect transistors (FETs) are held in an enable or disable state to effect current in phases of the motor. The phases have a high FET and a low FET. Control circuitry is employed to detect back electromotive force and zero crossing (Zc) signals that indicate transition timing for the commutation states. At a transition state the current is decreased in accordance with a noninstaneous decay function and applying a pulse width modulated signal to a switching element. Alternatively, the current is decreased by enabling either all low side FETs or all high side FETs to allow the current to decay. The next commutation state is applied after the current has been reduced, avoiding negative current to be source from ground and reducing current spikes in the motor.
REFERENCES:
patent: 4197489 (1980-04-01), Dunn et al.
patent: 5012166 (1991-04-01), Ushijima et al.
patent: 5115174 (1992-05-01), Masuda et al.
patent: 5397972 (1995-03-01), Maiocchi
patent: 5446359 (1995-08-01), Horst
patent: 5457365 (1995-10-01), Blangaila et al.
patent: 5461295 (1995-10-01), Horst
patent: 5466997 (1995-11-01), Utenick et al.
patent: 5589752 (1996-12-01), Iwasaki et al.
patent: 5767643 (1998-06-01), Pham et al.
patent: 5796545 (1998-08-01), Canclini
patent: 5808438 (1998-09-01), Jeffrey
patent: 5821715 (1998-10-01), Plutowski et al.
patent: 5859512 (1999-01-01), Buthker
patent: 5936365 (1999-08-01), Li et al.
patent: 5973462 (1999-10-01), Kalpathi et al.
patent: RE36568 (2000-02-01), Horst
patent: 6088185 (2000-07-01), Ratliff et al.
patent: 6104153 (2000-08-01), Codilian et al.
patent: 6198590 (2001-03-01), Codilian et al.
patent: 6236174 (2001-05-01), White
patent: 6285521 (2001-09-01), Hussein
patent: 6411057 (2002-06-01), Gotou
patent: 6493169 (2002-12-01), Ferris et al.
patent: 6498446 (2002-12-01), Menegoli et al.
patent: 6534936 (2003-03-01), Messanger et al.
patent: 6549361 (2003-04-01), Bennett et al.
patent: 6560056 (2003-05-01), Ryan
patent: 6566832 (2003-05-01), Ataee
Fellers , Snider, et al.
Nappi Robert
Seagate Technology LLC
Smith Tyrone
LandOfFree
Spindle motor control using a current profile to taper... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Spindle motor control using a current profile to taper..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spindle motor control using a current profile to taper... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3507663