SYSTEM AND METHOD FOR CONTROLLING PERMANENT MAGNET MOTOR, AND METHOD FOR CONTROLLING ELEVATOR

PROBLEM TO BE SOLVED: To provide speed control that suppresses demagnetization of a magnet in the short-circuit failure of a power converter in a permanent magnet synchronous motor control. SOLUTION: In a system in which an elevator or the like is driven by a permanent magnet motor 1, when the tempe...

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Bibliographic Details
Main Authors MITA FUMIAKI, HIRUTA KIYOHARU, ONUMA NAOTO, KISHIKAWA KOSEI, HOTATE HISAFUMI
Format Patent
LanguageEnglish
Published 08.01.2009
Subjects
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
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Summary:PROBLEM TO BE SOLVED: To provide speed control that suppresses demagnetization of a magnet in the short-circuit failure of a power converter in a permanent magnet synchronous motor control. SOLUTION: In a system in which an elevator or the like is driven by a permanent magnet motor 1, when the temperature of the magnet inside a motor is detected or estimated from the output of a current detector 41, and the switching element failure of the power converter is assumed under the detected or estimated temperature, the maximum speed is limited so that a short-circuit current value is put in a range of not larger than a current value of demagnetization resistance from the short-circuit current value of a motor winding to be calculated from the motor rotation speed. The demagnetization of the permanent magnet motor is prevented, and in the elevator, overrun caused by the demagnetization or sudden deceleration by a safety device at the terminal floor is avoided. COPYRIGHT: (C)2009,JPO&INPIT
Bibliography:Application Number: JP20070166446