CONNECTION OF CONTACTOR FOR ROTOR-RESISTANCE SHORT-CIRCUIT

PURPOSE:To render the wear of contacts of three poles uniform to lengthen the life of each contact by connecting junction bars, which link the contacts of the three poles, and electric wires so that the values of resistance of the junction bars and wires are almost equal. CONSTITUTION:In the selecti...

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Bibliographic Details
Main Authors FURUTA KATSUMI, KIMURA SHIGERU
Format Patent
LanguageEnglish
Published 25.06.1992
Subjects
BASIC ELECTRIC ELEMENTS
CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS
CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
ELECTRICITY
GENERATION
RESISTORS
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Summary:PURPOSE:To render the wear of contacts of three poles uniform to lengthen the life of each contact by connecting junction bars, which link the contacts of the three poles, and electric wires so that the values of resistance of the junction bars and wires are almost equal. CONSTITUTION:In the selection of the capacity of a contact 6 for short-circuiting a rotor resistance, a -connected contact is generally selected for the purpose of usually miniaturizing or economizing a size. This method has the merit of making it possible to use a comparatively small motor for the secondary line current of a motor 1 because the contactor 6 is -connected. Therefore, a wire 8 remains as it is used in a conventional system and combined with junction bars 7 so that a conductor resistance can be made variable, and the resistance is made to coincide with that of the wire 8 as much as possible so that a current of the value of 1/3<1/2> of the line current flows uniformly through each contact. Thus, the wear of each contact can be made uniform and its life can be made longer.
Bibliography:Application Number: JP19900302042