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Induction Machine Design Methodology for Self-Sensing: Balancing Saliencies and Power Conversion Properties

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2 Author(s)
Brown, I.P. ; A.O. Smith Corp. Technol. Center, Milwaukee, WI, USA ; Lorenz, R.D.

Zero-to-low-speed flux/rotor-position self-sensing techniques rely on the interaction of saliencies (asymmetries) with an injected signal or special switching pattern in the inverter to produce a response which contains information about the location of the saliency. In this paper, three types of deterministic spatial rotor position saliencies are introduced into an induction machine (IM). The saliencies were created by modulating the following: 1) the rotor bridge opening width; 2) the rotor bridge opening height; and 3) the rotor bridge opening fill. The influence of saliency geometric design variables on the self-sensing and power conversion properties is determined using a design of experiments and response surface methodology. An example IM design, which maximizes the self-sensing properties while preserving power conversion abilities, is presented. Modulation of the rotor bridge fill appears to be the least desirable saliency type. Both rotor bridge opening width and height modulations can be used successfully, but the rotor bridge opening width modulation requires extra simulations to characterize the self-sensing properties.

Published in:

Industry Applications, IEEE Transactions on  (Volume:47 ,  Issue: 1 )

Date of Publication:

Jan.-Feb. 2011

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