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Accurate detection of secondary current in shaft hole of induction motors for reliable controls

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4 Author(s)
Furuta, A. ; Dept. of Electr. Eng., Nagoya Univ., Japan ; Sompob, P. ; Mohri, K. ; Kaneshige, K.

Accurate controls for the speed and the torque of induction motors (IM) are realized using the detected secondary current (I2) signal with the inverter having a constant ratio of the primary voltage over the driving frequency (V1/f). A new method for detecting I2 is presented setting a MI sensor head inside a drilled hole through a shaft of an actuator type IM, in which an almost pure I 2 signal having the slip frequency is stably detected, An accurate and reliable control system for the IM is constructed using the I2 feedback loop with the inverter

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Magnetics, IEEE Transactions on  (Volume:35 ,  Issue: 5 )