Browse Prior Art Database

Planetary Homopolar Generator

IP.com Disclosure Number: IPCOM000082371D
Original Publication Date: 1974-Nov-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Varadarajan, HD: AUTHOR

Abstract

Conventional homopolar generators use abrasive brushes which cause wear, noise, large ohmic drop and maintenance difficulties. The problem is particularly acute in high speed machines needed to generate a few volts at high current.

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Planetary Homopolar Generator

Conventional homopolar generators use abrasive brushes which cause wear, noise, large ohmic drop and maintenance difficulties. The problem is particularly acute in high speed machines needed to generate a few volts at high current.

The drawing, which is a cross-sectional view parallel to the axis of rotation, illustrates a novel homopolar generator which uses rolling contacts instead of brushes, the conductor executing a planetary motion which eliminates high velocity abrasive losses and high ohmic drops. The parts of the generator are as follows:- S stationary yoke F field coils A solid iron rotor C conductor insulated from rotor R conducting rings mounted on and insulated from stator I fibrous insulating material rigidly coupling shaft and rotor D dumbell type rolling ends on conductor G1 rotating gear G2 fixed gear.

The gears G1, G2 are not strictly necessary but assist in the rolling of the dumbell ends D of the conductor C. Both the conductor dumbell ends D and the contact rings R have an elastic periphery for large area contact.

Alternatively, a conducting belt may be used to conduct the current from conductor C to rings R. The gears G1, G2 are not then required but the conductor C must be separated from the rings R by a small spacing.

In either design, the diameter of the dumbell ends D should be equal to the diameter of the rings R.

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