Shorted turn for moving coil motors

Electrical generator or motor structure – Dynamoelectric – Linear

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Details

310 27, 318135, H02K 4102

Patent

active

054204682

ABSTRACT:
A linear motor of the type used to control the radial position of a write/read transducer relative to a rotating data storage disk comprises an elongated tubular-shaped permanent magnet which concentrically surrounds and is spaced, by an air gap, from an elongated pole piece of highly permeable material (e.g. steel). A selectively energizable coil, concentrically arranged between the magnet and pole piece, is adapted to move axially in response to an applied current. According to the invention, the pole piece supports a plurality of "shorting rings" made of high conductivity, low permeability material. The shorting rings are embedded in the pole piece so as to be coextensive with the surface thereof. The spaced shorting rings function as a "shorted turn" which operates to reduce the rise time of current applied to the coil without significantly reducing the magnetic flux in the air gap through which the coil is linearly driven.

REFERENCES:
patent: 3505544 (1970-04-01), Helms
patent: 3521092 (1970-07-01), Kalthoff
patent: 3656015 (1972-04-01), Gillum
patent: 3723779 (1973-03-01), Gillum
patent: 3778652 (1973-12-01), Endress
patent: 4439699 (1984-03-01), Brende et al.
patent: 4603270 (1986-07-01), Van Davelaar
patent: 4685202 (1987-08-01), Booth et al.

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