Browse Prior Art Database

High-Speed Commutator

IP.com Disclosure Number: IPCOM000098175D
Original Publication Date: 1960-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

French, WK: AUTHOR

Abstract

A commutator for handling large currents is provided which requires no moving parts except for individual contacts.

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High-Speed Commutator

A commutator for handling large currents is provided which requires no moving parts except for individual contacts.

Two coils 1 and 2 are arranged in a spaced relationship 90 degrees apart. A sine wave is applied to each of the coils with the wave applied to one coil displaced 90 degrees in phase relationship with the other. A rotating magnetic field is thus produced which rotates at a speed proportional to the applied sine wave.

A plurality of spring steel strips 3 is mounted around the periphery of the coils. One end of each of the strips is anchored to a terminal 4. The other end of each of the strips is free to move toward the terminals 5. The steel strips may be permanently magnetized or selectively polarized by coils 6.

Proper polarization of coils 6 causes the steel strips to be repelled away from the rotating magnetic field to complete an electrical path between the two terminals. All the contacts may be closed sequentially by either the south or north pole of the rotating field depending upon the direction of polarization. Selected contacts may be skipped by leaving them de-energized. Different sequences may be obtained by selectively polarizing some of the contacts to be repelled by the north pole of the field and some of the contacts to be repelled by the south pole.

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