Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1978-05-03
1980-07-29
Duggan, Donovan F.
Electrical generator or motor structure
Dynamoelectric
Linear
318135, H02K 3700
Patent
active
042152836
ABSTRACT:
A linear stepping motor comprising a stator having a central passageway extending therethrough and a secondary in the form of an elongated cylindrical member disposed within the passageway. The stator is formed of a plurality of coil groups, each group including at least one hollow coil disposed between a pair of magnetic stator plates. The coil groups are disposed co-axially, with immediately adjacent groups separated by respective hollow non-magnetic spacer. The secondary includes a plurality of annular rings of magnetic material disposed at equally spaced locations along the secondary. The coil groups are sequentially pulsed by electrical energy to effect the stepwise movement of the secondary along the passageway.
In one embodiment the secondary is a magnetic material rod having a plurality of peripheral grooves cut at equally spaced locations therealong, with the portions of the rod between the grooves forming the annular rings.
In another embodiment the secondary is in the form of a hollow tube having a fixed rod-like insert therein. The tube is formed of portions of magnetic and non-magnetic material, with the annular rings being formed of magnetic material. The insert is formed of magnetic and non-magnetic material sections, with the magnetic sections being disposed opposite to the coil groups of the stator.
Means are provided for locking the secondary at any predetermined output position.
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patent: 3433983 (1969-03-01), Keistman et al.
patent: 3548273 (1970-12-01), Parodi et al.
patent: 3566224 (1971-02-01), Vallauri et al.
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