A Fast-Acting Current Limit for a DC Motor Drive
- 1 September 1986
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Industry Applications
- Vol. IA-22 (5) , 798-804
- https://doi.org/10.1109/tia.1986.4504796
Abstract
The two basic methods of providing current-limit protection for a variable-speed dc motor drive are examined. The most common method, the current regulator, is a two-loop scheme consisting of a current-regulating loop enclosed within a speed-control loop. The alternate method is the interventionist system, which normally operates in the speed-control mode, the current limiter taking control only after the armature current has exceeded a threshold value. The paper reviews the existing literature on the topic and goes on to describe a new interventionist-type system. The speed of response is extremely high: with a typical, fully controlled three-phase bridge rectifier the current is limited with high accuracy within one-sixth of a cycle. Experimental results for a 50-hp machine are given.Keywords
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