Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1995-12-20
1998-06-16
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7806, G11B 555
Patent
active
057680450
ABSTRACT:
A self-contained disk drive actuator velocity controller for, independently of the disk drive microprocessor, placing the actuator into a velocity mode to slew the actuator to a pre-programmed velocity during parking, unparking, power interruption or microprocessor malfunction. The velocity controller may place the actuator into the velocity mode in response to a timeout signal that is generated in the event the microprocessor fails to update the current demand DAC within a predetermined timeout interval. The velocity controller may also place the actuator into the velocity mode in response to a supply power loss. In addition, the velocity controller may be triggered in response to a command from the microprocessor to park or unpark the actuator. The velocity controller monitors the BEMF generated by the actuator motor coil and adjusts the gain of the actuator motor driver accordingly until BEMF reaches a value that corresponds to the target velocity. The velocity controller measures the BEMF very accurately because it includes a nulling or calibration circuit that operates during tracking mode to nullify the effects of parasitic actuator coil resistance.
REFERENCES:
patent: 4755892 (1988-07-01), Carteau et al.
patent: 4786994 (1988-11-01), Carteau et al.
patent: 4864437 (1989-09-01), Couse et al.
patent: 4933785 (1990-06-01), Morehouse et al.
patent: 5231549 (1993-07-01), Morehouse et al.
patent: 5258695 (1993-11-01), Utenick et al.
patent: 5408374 (1995-04-01), Morehouse et al.
patent: 5495156 (1996-02-01), Wilson et al.
patent: 5566369 (1996-10-01), Carobolante
Patton, III Charles Royston
Stupeck Donald George
Habermehl James L.
Psitos Aristotelis M.
Shara Milad G.
Western Digital Corporation
Young Leo J.
LandOfFree
Hardware velocity limit control system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hardware velocity limit control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hardware velocity limit control system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1732617