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Pulse Operated Moving Coil Actuator

IP.com Disclosure Number: IPCOM000077092D
Original Publication Date: 1972-Jun-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Mendez, HA: AUTHOR [+2]

Abstract

The actuator employs a coil which is driven through a transformer, which constitutes an integral part of the system and which, therefore, allows the flexibility of impedance transformation. ABThe moving "coil" is divided in two sections and is made of N two-turn coils electrically isolated from each other. Each of the N coils has one turn in the first section (active coils) and one turn in the second section (secondary coils). In the figure, this means that coil No. 1 is made of turn No. 1 of the first section in series with turn No. 1 of the second section, and so on. The interconnection path is shown in the figure and may be achieved by using printed-circuit techniques on the bobbin.

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Pulse Operated Moving Coil Actuator

The actuator employs a coil which is driven through a transformer, which constitutes an integral part of the system and which, therefore, allows the flexibility of impedance transformation. ABThe moving "coil" is divided in two sections and is made of N two-turn coils electrically isolated from each other. Each of the N coils has one turn in the first section (active coils) and one turn in the second section (secondary coils). In the figure, this means that coil No. 1 is made of turn No. 1 of the first section in series with turn No. 1 of the second section, and so on. The interconnection path is shown in the figure and may be achieved by using printed-circuit techniques on the bobbin.

The current for the operation of the linear motor is obtained through a transformer. The primary of this transformer may be constituted by numerous turns of wire carrying a reasonably small current. The secondary is made up of those few turns of the second section of the moving coil that are directly opposite the primary winding.

A suitable soft-iron piece having a width approximately equal to that of the active gap of the motor, ensures that only the desired number of turns are energized. Since each of these turns is connected to corresponding turns in the first section of the moving coil, the net result is that only those turns of the active coil lying inside the gap are carrying current.

This type of motor combines a narrow gap capable of high...