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Advanced Electric Drives: Analysis, Control, and Modeling by Ned Mohan

By Ned Mohan

Complex electrical Drives makes use of a physics-based method of clarify the elemental options of contemporary electrical force keep an eye on and its operation less than dynamic conditions.
• Gives readers a “physical” photograph of electrical machines and drives with no resorting to mathematical modifications for simple visualization
• Confirms the physics-based research of electrical drives mathematically
• Provides readers with an research of electrical machines in a manner that may be simply interfaced to universal strength digital converters and regulated utilizing any keep watch over scheme
• Makes the MATLAB/Simulink documents utilized in examples to be had to someone in an accompanying website
• Reinforces basics with quite a few dialogue questions, proposal quizzes, and homework difficulties

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Extra info for Advanced Electric Drives: Analysis, Control, and Modeling Using MATLAB / Simulink

Example text

3-10a,b with dλsq/dt, dλrd/dt, and dλrq/dt. 3-8 RELATIONSHIP BETWEEN THE dq WINDINGS AND THE PER-PHASE PHASOR-DOMAIN EQUIVALENT CIRCUIT IN BALANCED SINUSOIDAL STEADY STATE In this section, we will see that under a balanced sinusoidal steady-state condition, the dq-winding equations combine to result in the per-phase equivalent circuit of an induction machine that we have derived in the previous course [1]. It will be easiest to choose ωd = ωsyn (although any other choice of reference speed would lead to the same results; see Problem 3-8) so that the dq-winding quantities are dc and their time derivatives are zero under a balanced sinusoidal steady-state condition.

3-11, I A = −I ra′ . 3-9 COMPUTER SIMULATION In dq windings, the flux linkages and voltage equations are derived earlier. We will use λsd, λsq, λrd, and λrq as state variables, and express isd, isq, ird, and irq in terms of these state variables. The reason for choosing flux linkages as state variables has to do with the fact that these quantities change slowly compared with currents, which can change almost instantaneously. We can calculate dq-winding currents from the stator and the rotor flux linkages of the respective windings as follows: Referring to Fig.

2-2 Derive the expression for Lmutual in Eq. (2-8) by energy storage considerations. Hint: Assume that only the stator phases a and b are excited so that ib = −ia. To keep this derivation general, begin by assuming an arbitrary angle θ between the magnetic axes of the two windings. 2-3 Write the expressions for LkJ as functions of θm, where k ≡ a, b, c and J ≡ A, B, C. 2-4 Calculate Ls, Lr, and Lm for the “test” motor described in Chapter 1. 2-5 A motor with the following nameplate data is operating in a balanced sinusoidal steady state under its rated condition (with rated voltages applied to it and it is loaded to its rated torque).

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