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Internal Transverse Cooling of Tubular Armature

IP.com Disclosure Number: IPCOM000074736D
Original Publication Date: 1971-Jun-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Fisher, GA: AUTHOR

Abstract

The low inertia printed circuit tubular armature 1 of permanent magnet direct current motor 2 is internally cooled by causing a large volume of air to flow axially into two 180 degrees spaced grooves 3 and 4, in magnetic flux return path member 5. These two grooves are restricted at the other end of the motor and the air is thus forced to flow in opposite directions transversely around the inside surface of the armature. After flowing approximately 90 degrees around the inside of the armature, the air encounters two other 180 degrees spaced grooves 7 and 8 which are restricted at the end of the motor seen in View A. The air flows into these grooves and out of the other end of the motor.

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Internal Transverse Cooling of Tubular Armature

The low inertia printed circuit tubular armature 1 of permanent magnet direct current motor 2 is internally cooled by causing a large volume of air to flow axially into two 180 degrees spaced grooves 3 and 4, in magnetic flux return path member 5. These two grooves are restricted at the other end of the motor and the air is thus forced to flow in opposite directions transversely around the inside surface of the armature. After flowing approximately 90 degrees around the inside of the armature, the air encounters two other 180 degrees spaced grooves 7 and 8 which are restricted at the end of the motor seen in View A. The air flows into these grooves and out of the other end of the motor.

The four grooves are spaced to coincide with the spaces between the four permanent magnets 9, thus these grooves also shape the magnetic flux field of the motor, causing the flux to be concentrated under each magnet. Four motor brushes, not shown, engage the outer surface armature conductors in the space between the magnets, on the opposite side of the armature from the four grooves. The winding conductors in this area carry very little electrical current and generate very little heat.

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