What is a Hysteresis Curve of electromagnetic brake or clutch?

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What is a Hysteresis Curve of electromagnetic brake or clutch?

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The graph shown below represents a typical (BH) Torque vs. Current curve for an electromagnetic brake or clutch. The torque for a given amount of current is different when the current is increasing than when it is decreasing. This is due to the hysteresis phenomenon of magnetic material.

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