公开(公告)号：CA996183A

公开(公告)日：1976-08-31

申请号：CA187432

申请日：1973-12-05

Applicant: IBM

Inventor： HENDRICKSON KENNETH E ,  LOPOUR WARREN A ,  MATTSON LARRY F ,  KEIDL STEVEN D ,  SEGAR LAWRENCE P

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

Abstract: A control system for a stepping motor operating on the bang-bang principle in which opposing torque is exerted on the rotor of the motor as the rotor oscillates across its desired or home position. The degree of rotation of the rotor is indicated by a digital encoder, and associated circuitry or microprogramming provides a return torque on the rotor for a predetermined time, such as 120 microseconds, if the rotor oscillates across and beyond its desired position less than that amount required to produce an output pulse of the encoder. If the degree of oscillation is greater so that one but not two encoder pulses is produced, return torque is maintained until an encoder pulse is received after the rotor has reversed direction, and then no torque is applied on the rotor. If the oscillation is greater than that required to produce two encoder pulses but less than three encoder pulses, reverse torque is maintained on the rotor until the rotor returns to a rotative position corresponding to one encoder pulse. Then a torque is applied onto the rotor in the same direction as that in which the rotor initially rotated limited however to 120 microseconds duration. There is an overlap of torques between the two and one encoder pulse positions of the rotor as it returns to its home position. For oscillations of the rotor greater than those mentioned, similar applications of torque are made, so that the rotor is eventually brought to its home position.

公开(公告)号：CA1085507A

公开(公告)日：1980-09-09

申请号：CA261661

申请日：1976-09-21

Applicant: IBM

Inventor： HUFFINE COY L ,  MATTSON LARRY F ,  SHIDLER KARL A ,  SLINDEE NORMAN E

IPC: G11B23/033 ,  B29B9/00 ,  B30B11/20 ,  G11B23/50 ,  G11B5/016 ,  G11B23/04 ,  H05F3/00

Abstract: ANTI-STATIC MAGNETIC RECORD DISK ASSEMBLY 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：FR2326003A1

公开(公告)日：1977-04-22

申请号：FR7623748

申请日：1976-07-28

Applicant: IBM

Inventor： HUFFINE COY L ,  MATTSON LARRY F ,  SHIDLER KARL A ,  SLINDEE NORMAL E

IPC: G11B23/033 ,  B29B9/00 ,  B30B11/20 ,  G11B23/50 ,  G11B1/00 ,  G11B23/00

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.