Induction motor overheat monitoring method, induction motor monitoring device, and induction motor control system

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United States of America

PATENT NO 11303236
APP PUB NO 20210152111A1
SERIAL NO

17048633

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Abstract

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An induction motor overheat monitoring method and device detects overheating of an induction motor from a detection value of a current sensor. A resistance calculation relationship data indicating a relationship between a resistance and a feature amount at the time of starting of the induction motor and a determination reference value for determining overheating are stored in advance. At each starting, a current of the induction motor is detected, a signal regarding a phase angle difference is calculated, and a feature amount of the motor is calculated from the signal regarding the phase angle difference. Further, a resistance of the induction motor is calculated by using the feature amount of the motor and the resistance calculation reference data stored in advance. Then, a temperature of the induction motor is calculated from the resistance of the induction motor, and it is determined if the motor is overheated.

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Patent Owner(s)

Patent OwnerAddress
HITACHI INDUSTRIAL EQUIPMENT SYSTEMS CO LTD1-5-1 SOTOKANDA CHIYODA-KU TOKYO 1010021 ?1010021

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Iwaji, Yoshitaka Tokyo, JP 77 946
Kaneko, Satoru Tokyo, JP 126 2165
Tobari, Kazuaki Tokyo, JP 53 447
Zhou, Guangbin Tokyo, JP 21 120

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