In general, some mechanical speed reduction when the power reduction, the performance of the motor voltage drop when the current also drop (with constant impedance characteristics).In other words, in the first stage, the current decreases with the voltage and the load has a constant impedance characteristic.
Some mechanical speed is reduced when the power does not change, the performance of the motor voltage drop is increased current (with constant power characteristics).In the second stage, the current rises instead, indicating that the load has a constant power characteristic.Generally, the load has only one characteristic, and the mechanical characteristic changes at different speeds are also present.
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