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A digital signal processing approach to real-time AC motor modeling

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3 Author(s)
Vainio, O. ; Signal Process. Lab., Tampere Univ. of Technol., Finland ; Ovaska, S.J. ; Pasanen, J.J.

Discrete-time computational models of squirrel-cage AC motors are derived and analyzed for the purpose of advanced motor control. The starting point is a continuous-time model defined by a pair of simultaneous complex-coefficient differential equations. Discrete-time models are derived using both the bilinear transformation and the forward-difference approximation. The exact dependence between stability and the minimum sampling rate in the forward-difference approach is shown. The responses of the two discretized models are compared using real-world motor parameters. Using the forward difference method, a more compact implementation is obtained (although a higher sampling rate is required) as compared to the bilinear transformed model of equivalent performance and 2.7 times higher computational complexity. A 16/24-b DSP-ASIC coprocessor prototype implementing the AC motor model is introduced

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Industrial Electronics, IEEE Transactions on  (Volume:39 ,  Issue: 1 )