By Ned Mohan
Complex electrical Drives makes use of a physics-based method of clarify the basic strategies of contemporary electrical force keep watch over and its operation lower than dynamic conditions.
• Gives readers a “physical” photograph of electrical machines and drives with no resorting to mathematical variations for simple visualization
• Confirms the physics-based research of electrical drives mathematically
• Provides readers with an research of electrical machines in a fashion that may be simply interfaced to universal energy digital converters and regulated utilizing any regulate scheme
• Makes the MATLAB/Simulink records utilized in examples on hand to an individual in an accompanying website
• Reinforces basics with quite a few dialogue questions, inspiration quizzes, and homework difficulties
Read Online or Download Advanced Electric Drives: Analysis, Control, and Modeling Using MATLAB / Simulink PDF
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Additional info for Advanced Electric Drives: Analysis, Control, and Modeling Using MATLAB / Simulink
3-4) 2π 4π cosθda − cos θda − ia (t ) cos(θda ) isd (t ) 2 3 3 = ib (t ) , isq (t ) 2π 4π 3 − sin(θda ) − sin θda − − sin θda − ic (t ) 3 3 [Ts ]abc → dq (3-12) where [Ts]abc→dq is the transformation matrix to transform stator a-b-c phase winding currents to the corresponding dq winding currents. This transformation procedure is illustrated by the block diagram in Fig. 3-4a. The same transformation matrix relates the stator flux linkages and the stator voltages in phase windings to those in the equivalent stator dq windings.
3-40) into Eq. (3-41), 2 Td , rotor p µ 3 / 2 N s = π 0 r p 2 g isq + Lr irq ird. Lm (3-42) Rewriting Eq. (3-42) below, we can recognize Lm from Eq. (2-13) N p3 µ = π 0 r s p 2 2 g 2 Td ,rotor isq + Lr irq ird . Lm Lm Hence, Td , rotor = p p (Lm isq + Lr irq ) ird = λrq ird . 2 2 λ (3-43) rq 3-5-2 Torque on the Rotor q-Axis Winding On the rotor q-axis winding, the torque produced is due to the flux density produced by the d-axis windings in Fig.
2-7a result in the same mmf acting on the air gap (hence the same flux-density ( ) distribution) as that produced by isa = Iˆs e jθis , that is, by a current equal to its peak value Ȋs flowing through a hypothetical sinusoidally distributed winding shown in Fig. 2-7b, with its magnetic axis oriented at θis (= θFs ). This hypothetical winding has the same number of turns Ns sinusoidally-distributed as any of the phase windings. The earlier physical explanation not only permits the stator current space vector to be visualized, but it also simplifies the derivation of the electromagnetic torque, which can now be calculated on just this single hypothetic winding, rather than having to calculate torques separately on each of the phase windings and then summing them.