International Business Machines Corporation

Globalfoundries Inc.

Reed Alan Hancock

Nhan Xuan Bui

Eiji Ogura

Kazuhiro Tsuruta

Daniel James Winarski

Allen Keith Bates

Randy Clark Inch

Kevin Bruce Judd

Wayne Isami Imaino

Armando Jesus Argumedo

Edwin Ralph Childers

Ernest Stewart Gale

James Mitchell Karp

Tomoko Taketomi

David Howard Flores Harper

Joseph Chase Ramirez

Giovanni Cherubini

Pamela Ruth Nylander-Hill

Scott Milton Fry

William Marvin Dyer

James Alfred Jackmond

Evangelos Stavros Eleftheriou

Robert Allan Hutchins

Robert Allen Hutchins

Paul Joseph Seger

Alan A Fennema

Shuhei Nadehara

Linda S Daanen, Legal Representative

Glen Alan Jaquette

Louie Arthur Dickens

Keisuke Tanaka

Jens Jelitto

Tara Lynn Astigarraga

Angeliki Pantazi

Raymond Yardy

Larry LeeRoy Tretter

Stephen Leonard Schwartz

Steven Ross Bentley

Michael E Starling

Diana Joyce Hellman

Eric Rolf Christensen

John Ray Blair

Roger Javier Justo

Lawrence D Tipton

Francisco Antonio Baca

Kevin Keith Kartchner

Perry E Abbott

David H Flores Harper

Louis P Russo

Haiyu Zhao

Armando Jesus Argumendo

In one general embodiment, a magnetic recording tape includes a plurality of servo tracks, each servo track comprising a series of magnetically defined bars, wherein an average stripe width of the bars is between about 1.0 micron and about 2.2 microns, where an average servo frame length of groups of the bars comprising a servo frame is between about 120 microns and about 180 microns. In another general embodiment, a system includes a head having at least one servo reader and an array of data transducers of a type selected from a group consisting of readers and writers; and a controller operative to selectively enable every other transducer of a particular type in the array in a first mode of operation, and operative to selectively enable every transducer of the particular type in the array in a second mode of operation.

Magnetic tape servo format allowing for increased linear tape density and systems thereof

Dynamic reconfiguration-switching of motor windings is optimized between winding-configurations. Acceleration is traded off in favor of higher velocity upon detecting an electric motor is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity.

Dynamic reconfiguration-switching of windings in an electric motor

Provided are a method, system, and program for adjusting tension in a tape media to counter tape dimensional stability (TDS) errors in a tape media. A determination is made of whether to adjust tension of the tape media based on a detected error rate of reading at least one of the tracks. The tension of the tape media is adjusted in response to determining to adjust the tension.

Adjusting tension in a tape media to counter tape dimensional stability (TDS) errors in a tape media

Dynamic reconfiguration-switching of motor windings in a disk drive is optimized between winding-configurations by selectively lowering resistance of a constantly used portion of one of the motor windings. Acceleration is traded off in favor of higher velocity upon detecting the electric motor in the electric vehicle is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity.

Selectively lowering resistance of a constantly used portion of motor windings in disk drive

A method according to one embodiment includes computing a radius value of a tape on an outgoing reel during unwinding of the tape from the outgoing reel, adjusting the computed radius with an offset calculated from a direct measurement of velocity from the tape position, and outputting the adjusted computed radius. A method according to another embodiment includes computing a radius value of a tape on an incoming reel during winding while the tape is being wound onto the incoming reel, adjusting the computed radius with an offset calculated from a direct measurement of velocity from the tape position, and outputting the adjusted computed radius.

Accurate radius and velocity measurement of tape transports

According to one embodiment, a method includes determining whether a primary velocity is valid and/or in a steady state; averaging a velocity error over a predetermined time period upon determining the primary velocity is valid and/or in a steady state; and calculating a new friction value based on the averaged velocity error.

Tape friction measurement

An apparatus for controlling an electric motor is provided. A plurality of switches is provided for controlling a direction of current through motor coils of the electric motor. A brushless motor control circuit is connected to each of the plurality of switches. Responsive to a request to adjust one of an angular velocity and an angular acceleration of the electric motor, the plurality of switches are activated to place the motor coils in a predetermined configuration to maximize torque or reduce a total back electromotive force (BEMF) from the motor coils.

Increasing tape velocity by dynamic switching

For an electric motor used as a generator in an electric vehicle for dynamic braking, employing a dynamic reconfiguration-switching of motor windings upon the generator exceeding one of a maximum usable constraint of a first rechargeable battery in order to reduce a voltage constant of the electric motor thereby limiting one of a produced voltage and a produced power.

Dynamic reconfiguration-switching of windings in an electric motor used as a generator in an electric vehicle

Dynamic reconfiguration-switching of motor windings in a motor is optimized between winding-configurations by selectively lowering resistance of a constantly used portion of one of the motor windings. Acceleration is traded off in favor of higher velocity upon detecting the electric motor in the electric vehicle is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity.

Selectively lowering resistance of a constantly used portion of motor windings in an electric motor

A calculation function, which optimizes a dynamic reconfiguration-switching of motor windings between winding-configurations, is dynamically configured. Acceleration is traded off in favor of higher velocity upon detecting the electric motor is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity.

Dynamic configuration of a calculation function that optimizes dynamic reconfiguration-switching of windings in an electric motor

Dynamic reconfiguration-switching of motor windings is optimized between winding-configurations. Acceleration is traded off in favor of higher velocity upon detecting a brushless DC motor is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity.

Dynamic reconfiguration-switching of windings in a brushless DC motor

Dynamic reconfiguration-switching of motor windings in an electric motor in an electric vehicle is optimized between winding-configurations. Acceleration is traded off in favor of higher velocity upon detecting the electric motor in the electric vehicle is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity.

Dynamic reconfiguration-switching of windings in an electric motor in an electric vehicle

Dynamic reconfiguration-switching of motor windings is optimized between winding-configurations. Acceleration is traded off in favor of higher velocity upon detecting a tape storage drive is at an optimal angular-velocity for switching to an optimal lower torque constant and voltage constant. The total back electromotive force (BEMF) is prohibited from inhibiting further acceleration to a higher angular-velocity.

Dynamic reconfiguration-switching of windings in a tape storage drive

Growing community of inventors

Tucson, AZ, United States of America

Reed Alan Hancock