Apparatus and method for reducing spindle power and acoustic noi

Electricity: motive power systems – Limitation of motor load – current – torque or force

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

318138, 318254, H02P 728, H02P 602

Patent

active

058864890

ABSTRACT:
An apparatus and method for reducing spindle power and acoustic noise in a self-commutating brushless d.c. motor for a disk drive adjusts the commutation angle of the motor until a point of optimum power consumption is reached. In a preferred approach implemented during disk drive operation, a direction in which to change the commutation angle is determined such that spindle power consumption is decreased. The commutation angle is the changed in the determined direction until a point of minimum spindle power consumption is identified. In order to determine the correct direction of commutation angle change, the commutation angle is varied in a first direction for so long as the spindle power consumption is decreasing. If varying the commutation angle of the motor in the first direction results in an increase in spindle power consumption, the commutation angle of the motor is varied in a second direction. During drive operation, the commutation angle may be varied back and forth in order to maintain the point of minimum spindle power consumption. The apparatus and method also minimizes torque ripple by determining a drive torque profile and storing that profile in memory as a table of torque constant values indexed to the rotational position of the disk. As the disk spins, its rotational position is sensed and the drive current is adjusted using a corresponding torque constant value. In this way, the drive current is varied inversely to the torque profile so as to produce a substantially uniform torque output, or a torque output that additionally compensates for structural resonance or other drive properties. Still further, a current offset value may be applied that is proportional to the difference between the torque profile and the average torque.

REFERENCES:
patent: 4197489 (1980-04-01), Dunn et al.
patent: 4525657 (1985-06-01), Nakase et al.
patent: 4651067 (1987-03-01), Ito et al.
patent: 4874993 (1989-10-01), Tanaka et al.
patent: 4879498 (1989-11-01), Shinohara et al.
patent: 4943760 (1990-07-01), Byrne et al.
patent: 5023924 (1991-06-01), Tajima et al.
patent: 5115174 (1992-05-01), Masuda et al.
patent: 5122719 (1992-06-01), Bessenyei et al.
patent: 5191269 (1993-03-01), Carbolante
patent: 5200675 (1993-04-01), Woo
patent: 5210474 (1993-05-01), Oswald
patent: 5223775 (1993-06-01), Mongeau
patent: 5245256 (1993-09-01), Cassat et al.
patent: 5274313 (1993-12-01), Amrhein
patent: 5285135 (1994-02-01), Carobolante et al.
patent: 5319289 (1994-06-01), Austin et al.
patent: 5323093 (1994-06-01), Kikuchi
patent: 5334917 (1994-08-01), Lind
patent: 5382889 (1995-01-01), Peters et al.
patent: 5428276 (1995-06-01), Carobolante et al.
patent: 5446353 (1995-08-01), Schowe
patent: 5469215 (1995-11-01), Nashiki
patent: 5486743 (1996-01-01), Nagai
patent: 5631787 (1997-05-01), Huang et al.
patent: 5677605 (1997-10-01), Cambier et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Apparatus and method for reducing spindle power and acoustic noi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for reducing spindle power and acoustic noi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for reducing spindle power and acoustic noi will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2129657

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.