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Detections of secondary current and torque of induction motors using amorphous microcore field sensors

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4 Author(s)
Mohri, K. ; Kyushu Institute of Technology, Kitakyushu, Japan ; Nakano, M. ; Mukai, Y. ; Yoshida, Y.

New secondary-current sensors for squirrel-cage induction motors are presented using a multivibrator with two group amorphous microcores. The 8-pair micro cores are set near the both endrings of a rotor for cancellation of the influence of unstable rotor motion on sensing of the secondary current. Electromagnetic torque was detected as an output voltage of a multiplier for the secondary current and the main flux. The main flux was detected using a multivibrator-type flux sensor utilizing two stator teeth as two cores. A possible new control system for variable speed induction motors with a torque feedback loop is discussed, which stably works independently of variations of motor parameters.

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Magnetics, IEEE Transactions on  (Volume:22 ,  Issue: 5 )