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344 CHAPTER 10 Scalar and Vector Control of Induction Motor

FIGURE 10.9
Evolution using the scalar control for August 22, 2016.

FIGURE 10.10
Evolution using the vector control for December 6, 2016.

at its nominal value of 0.36 Wb. Moreover, these figures show that the rotor pul-
sation meets perfectly with its reference.
The useful power of the centrifugal pump is expressed by Eq. (10.28) [20]:
P u ðtÞ¼ hP l ¼ rgHqðtÞ (10.28)
3 2
where r is the density (kg/m ); g is the acceleration of gravity (m /s), H is the height
3
of rise (m), q(t) is the flow (m /s), P l is the absorptive power, which is obviously a
mechanical power on the shaft coupled to the pump and h is the pump efficiency.