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Designing a low cost vector controlled induction motor drive.

Author(s)
Suhail A. Qureshi Electrical Engineering Department, UET, Lahore, Pakistan
Ch. Sohail Safdar Post Graduate Department, UET, Lahore, Pakistan
Abstract
The Vector Control or Field-Oriented Control (FOC) technique transforms the dynamic structure of an AC machine into that of a separately excited DC machine where the flux and torque producing components are decoupled and can be controlled independently due to separate excitation. The AC squirrel cage motor is the basic universal workhorse of industry converting some 70-80 percent of all electrical powers into mechanical energy [31. Several types of vector control are possible: rotor-oriented, rotor-flux-oriented, stator-flux-oriented and magnetizing flux-oriented [1]. Indirect vector control with rotor flux orientation tends to give true decoupled control [6]. In this paper a new control technique is presented. This is done by modifying the conventional vector control algorithm in such a way that generation of unit vector and time varying coordinate transformations are eliminated. Hence, under the light of this approach, heavy computations are greatly reduced. This enables the use of an 8-bit microcontroller. The main advantage gained from vector control is high controlled torque production and therefore fast response to load or demanded speed changes. The proposed vector control [5] is presented where the derivation of equations used in the microcontroller implementation are presented as well. As Space Vector Based Current Inverter plays an important role in constructing the proposed vector control and therefore this paper also concentrates on demonstrating the working principle and advantages of the proposed inverter [4],[5]. Derivation of a Lookup Table is also given where a new approach for finding proper time for zero-voltage vector is introduced afterwards. Also hardware components of the proposed vector control system are presented.
Publication Details
Page(s) 42-46
DOI DOI not available
Published Journal: UET Research Journal, Volume: 14, Issue: 1--2, Year: 2003

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