专利内容由知识产权出版社提供
专利名称：Linear motor actuator发明人：HUGHES; GORDON F.申请号：US44272774申请日：19740214公开号：US38139A公开日：19750610
摘要：An improved linear magnetic actuator for use in a disk drive is described. Highperformance linear magnetic actuators are required in disk drive units to move read/writeheads quickly and accurately from one track on a disk file to another. A powerfulmagnetic field for use in a magnetic actuator can be produced at relatively low cost byusing flat slab magnets. An outer pole of square outside dimensions, and with a centralcircular bore, is used to transmit the magnetic lines of force from the flat magnets to thecircular coil winding. A single turn shorted copper sleeve is plated onto the bore surfaceof the outer pole to minimize coil winding inductance. Four stationary center poles arepositioned inside the movable coil assembly to provide a path for the magnetic lines offorce to the ends of the magnetic actuator, from there to the bottom, side and topplates of the magnetic actuator, and finally back to the magnets to complete themagnetic circuit. Each center pole has a gap positioned at its approximate center so thatunder high current conditions saturation will occur at the gap of the center pole and notelsewhere in the magnetic actuator, thus preventing a distortion of the permanentmagnetic field under high current conditions. The actuator is completely encased in flatsteel plates to prevent the generation of stray magnetic fields.
申请人：XEROX CORPORATION
更多信息请下载全文后查看
