Electro-magnetic drive unit comprising a pivotable armature

Details Electro-magnetic drive unit comprising a pivotable armature Electro-magnetic drive unit comprising a pivotable armature

1986-01-27

1988-03-15

Stephan, Steven L.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specific detail of storage medium support or motion production

G11B 310, G11B 700

Patent

active

047317787

ABSTRACT:
An electromagnetic drive unit comprises a stator (2) and an armature (4) which is pivotable about a pivotal axis (5) and which cooperates with the stator via an air gap. In order to minimize the volume and to obtain a maximum efficiency, the armature is arranged coaxially around the stator, the stator comprising at least two polepieces (6A) which are interconnected by a stator member (6B) carrying a coil (8). The armature comprises a plurality of radially magnetized poles (28A, 28B) which correspond in number to at least the number of polepieces, which poles are tangentially juxtaposed with alternately opposite polarities.

REFERENCES:
patent: 3912283 (1975-10-01), Hammond et al.
patent: 3970980 (1976-07-01), Nelson
patent: 4087095 (1978-05-01), Koda
patent: 4194743 (1980-03-01), Olsawa et al.
patent: 4403316 (1983-09-01), Van de Veerdonk
patent: 4620301 (1986-10-01), Koide

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