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Detection of secondary current and torque of squirrel-cage induction motor using amorphous magnetic sensor

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2 Author(s)
Inuzuka, K. ; Dept. of Electr. Eng., Nagoya Univ., Japan ; Mohri, K.

Reports experimental results on detecting the secondary current ( I2) and the electromagnetic torque (Tm ) using an amorphous-core magnetic-field sensor. The output of the sensor (Eout) was proportional to I2 . Eout had not only a voltage component of the exciting frequency f, but also components of a slip frequency ( s×f), fn-sf, and fn+ sf, where s is slip and fn is the drive frequency. The value of the component of fn-sf was proportional to Tm. The component of sf was due to magnetic field through the shaft. The components of fn±sf were due to a precession motion of the rotor. A torque calculated using Eout closely coincided with Tm and was detected without the influence of variation of temperature in an operating induction motor

Published in:

Magnetics, IEEE Transactions on  (Volume:28 ,  Issue: 5 )

Date of Publication:

Sep 1992

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