公开(公告)号：SG91895A1

公开(公告)日：2002-10-15

申请号：SG200007702

申请日：2000-12-28

Applicant: IBM

Inventor： ALEX CHLIWNYJ ,  JOHN JAMES GNIEWEK

IPC: G11B5/584

公开(公告)号：SG96570A1

公开(公告)日：2003-06-16

申请号：SG200005496

申请日：2000-09-25

Applicant: IBM

Inventor： ALEX CHLIWNYJ ,  JOHN JAMES GNIEWEK ,  ROBERT ALLEN HUTCHINS ,  STEVEN CARTER WILLS

IPC: G11B5/584 ,  G11B5/55 ,  G11B5/58 ,  G11B21/08

公开(公告)号：SG87190A1

公开(公告)日：2002-03-19

申请号：SG200006108

申请日：2000-10-23

Applicant: IBM

Inventor： ALEX CHLIWNYJ

IPC: G11B33/12 ,  G03B1/04 ,  G11B15/00 ,  G11B15/54 ,  H01R39/46 ,  H02K15/00 ,  H02P7/06 ,  H02P7/29

Abstract: Commutators on a direct current motor run at low speed for an extended period of time get covered with a coating that makes the interface between the commutator and the brushes unreliable especially with the low speed, low current operation. This is especially true for drive motors in a data processing tape drive unit where speed control is critical. The brush to commutator interface can be cleaned by applying a very high electrical current to the motor and varying the polarity of the current with a variable duty cycle to obtain the maximum cleaning currents in a relatively short time without dismantling the motors.