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BRUSHLESS ALTERNATOR WITH SELF-LIMITING SEPARATE EXCITER

IP.com Disclosure Number: IPCOM000005491D
Original Publication Date: 1983-Mar-01
Included in the Prior Art Database: 2001-Oct-09
Document File: 1 page(s) / 45K

Publishing Venue

Motorola

Related People

Mikhail Godkin: AUTHOR

Abstract

This brushless alternator utilizes a smaller alternator otthe Lundell type as the exciter for the main rotor in the brushless alternator. The smaller alternator or exciter is driven from the same rotating shaft as the main alternator. However, what would normally be considered the "rotor" 11 is bolted or other- wise affixed to the frame 12 of the alternator. The "stator" 13 of the Lundell type exciter is secured to the rotor 14 of the main alternator to freely rotate about the stationary rotor 11.

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@ MOTOROLA Technical Developments Volume 3 March 1983

BRUSHLESS ALTERNATOR WITH SELF-LIMITING SEPARATE EXCITER

By Mikhail Godkin

   This brushless alternator utilizes a smaller alternator otthe Lundell type as the exciter for the main rotor in the brushless alternator. The smaller alternator or exciter is driven from the same rotating shaft as the main alternator. However, what would normally be considered the "rotor" 11 is bolted or other- wise affixed to the frame 12 of the alternator. The "stator" 13 of the Lundell type exciter is secured to the rotor 14 of the main alternator to freely rotate about the stationary rotor 11.


:

   The advantage of this smaller Lundell type alternator exciter is that the output current of this type of exciter, which is the field current for the main alternator, will have a self-limiting characteristic at higher speeds. This prevents alternator winding burn-out at higher speeds in case of uncontrolled load or other alternator or regulator failures. By way of comparison, a conventional salient pole exciter has an output current that is directly proportional to the speed.

I' 1 Motorola, Inc. 1983 39

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