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公开(公告)号：FR2336760A1
公开(公告)日：1977-07-22
申请号：FR7634523
申请日：1976-11-08
Applicant: IBM
Inventor： LOUIS HELMUT , MATLA ARNO , SCHALLER KARL H , ZIMMERMANN VOLKER
Abstract: The surface of a magnetic disk (23) is divided into servo sectors (S1) and data sectors (S2). A selectively positionable magnetic head (24) effects, in predetermined time intervals controlled by clock signals of a clock sensor (26), the transfer of servo and data signals. The servo signals sensed in the servo sectors are used for the track following control of the magnetic head.
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公开(公告)号：FR2287132A1
公开(公告)日：1976-04-30
申请号：FR7525822
申请日：1975-08-11
Applicant: IBM
Inventor： ULLAND HARTMUT , ZIMMERMANN VOLKER , ZUEHLKE RAINER
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公开(公告)号：FR2278191A1
公开(公告)日：1976-02-06
申请号：FR7518142
申请日：1975-06-03
Applicant: IBM
Inventor： LUTZ HEINZ , ZIMMERMANN VOLKER , ZUEHLKE RAINER
Abstract: 1471272 Electric motors INTERNATIONAL BUSINESS MACHINES CORP 17 June 1975 [13 July 1974] 25692/75 Heading H2A An electric stepping motor comprises a rotor 1 having a conical portion co-operating with complementary stator pole faces, the cone angle being at least 15 degrees. The toothed conical rotor of the inductor type stepping motor shown is magnetized by a coil 7 and interacts with the toothed faces of four stator poles 3. The rotor may be hollow, Fig. 8 (not shown). In a modification, Fig. 9 (not shown), having a permanent magnet rotor comprising two conical portions placed base-to-base, the two conical surfaces are of opposite polarity and interact with respective groups of stator poles. Either the rotor teeth or the stator teeth of the two halves of the motor may be angularly staggered. An inductor type motor may also be designed to have two conical rotor portions.
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公开(公告)号：DE2303193A1
公开(公告)日：1974-07-25
申请号：DE2303193
申请日：1973-01-23
Applicant: IBM DEUTSCHLAND
Inventor： ZIMMERMANN VOLKER
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