公开(公告)号：DE2328501A1

公开(公告)日：1973-12-20

申请号：DE2328501

申请日：1973-06-05

Applicant: IBM

Inventor： GORETZKI JEROME ARNOLD ,  HENDRICKSON KENNETH EARL ,  MATTSON GARY LEVERNE ,  MATTSON LARRY FREDERICK

IPC: H02P8/00 ,  H02P8/24 ,  H02P5/12

Abstract: Control apparatus for a stepper motor functional to provide a varying amount of retro-torque braking depending on the load and voltage applied to the motor. The control apparatus includes circuitry responsive to the velocity of the rotor of the motor and more particularly to the time required for the rotor to move through a certain rotation and means for varying the application of the braking effect according to variations of this time and also of voltage applied to the motor.

公开(公告)号：DE2634501A1

公开(公告)日：1977-03-31

申请号：DE2634501

申请日：1976-07-31

Applicant: IBM

Inventor： HUFFINE COY LEE ,  MATTSON LARRY FREDERICK ,  SLINDEE NORMAN EDWARD

IPC: G11B23/033 ,  B29B9/00 ,  B30B11/20 ,  G11B23/50 ,  G11B23/02 ,  G11B3/58 ,  H05F3/00

Abstract: A rotary magnetic record disk assembly comprising a magnetic disk which is rotatably disposed within a containing jacket of material of high electrically insulating characteristics. An electrically conductive layer is disposed on the inside surface of the jacket for draining away electrostatic charge on the jacket.

公开(公告)号：DE2364762A1

公开(公告)日：1974-07-04

申请号：DE2364762

申请日：1973-12-27

Applicant: IBM

Inventor： HENDRICKSON KENNETH EARL ,  KEIDL STEVEN DENNIS ,  LOPOUR WARREN ANTHONY ,  MATTSON LARRY FREDERICK ,  SEGAR LAWRENCE PETER

IPC: G05B19/39 ,  H02P8/32 ,  H02P5/00