By Mukhtar Ahmad
This booklet provides a accomplished view of excessive functionality ac drives. it can be regarded as either a textual content e-book for graduate scholars and as an up to date monograph. it may well even be utilized by R & D execs interested by the development of functionality of drives within the industries. The publication may also be necessary to the researchers pursuing paintings on multiphase drives in addition to sensorless and direct torque keep an eye on of electrical drives on the grounds that up-to date references in those issues are supplied. it is going to additionally offer few examples of modeling, research and keep an eye on of electrical drives utilizing MATLAB/SIMULINK.
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Additional resources for High Performance AC Drives: Modelling Analysis and Control
G = 0. 60) As can be seen from this equation, in stationary frame the variables appear as sine waves in steady state with sinusoidal inputs. 57) models are used when the induction motor is controlled from the rotor side. 62) ωr = ωg Then the voltage equation can be written as : ⎡ r ⎤ ⎡ ⎤⎡ r ⎤ iqs vqs Lm p ωr L m Rs + Ls p ωr Ls ⎢ vr ⎥ ⎢ −ωr Ls Rs + Ls p −ωr Lm Lm p ⎥ ⎢ ir ⎥ ⎥ ⎥ ⎢ ds ⎢ ds ⎥ = ⎢ ⎦ ⎣ irqr ⎦ . 66) The model obtained in synchronous reference frame transforms the sinusoidal quantities in a-b-c frame to dc quantities in d-q-0 frame.
6. This angle will be varying with time as the rotor flux linkage space vector λr rotates and is referred as field angle. 34) These transformed currents are compared with the command current inputs i∗ds and i∗qs . The error signals obtained are amplified and used to control the flux and torque. These currents are transformed from field frame to stator frame using inverse transformation. Once the d-q components of current in stator frame are known, these can be converted into a-b-c components by 2/3 transformation.
The basic approach in obtaining simplified model involves the transformation of stator and rotor equations to a common reference frame represented by d-q axis. The reference frame can be revolving or stationary, can be attached to the stator or rotor. The possible choices for d-q axes frames in ac machines are, The d-q axis fixed to • the stator or stationary frame (stator reference frame) • the rotor and rotates at the speed of rotor (rotor reference frame) • rotor flux vector and rotates at the speed of rotor flux (rotor field reference frame) • a frame rotating at synchronous speed.