Abstract
Synchronous reluctance motors are arousing lively interest as a possible alternative to the less efficient induction motors. An open issue is the effective tuning of the inner current loops because of the nonlinearity that cannot be overlooked. The present paper uses a relay feedback approach to perform autotuning without resorting to any parameter knowledge. The tuning is iterated at different working points, to get a uniform current control bandwidth everywhere. Unlike many solutions in the field, the algorithm is truly autonomous, in the sense that it also suggests a correct value for the bandwidth specification. The paper includes both simulation and experimental results, obtained on a laboratory prototype.
Highlights
In the mainstream of energy and environmental global paradigms, the electric drives technology is moving toward more efficient motors and more intelligent control systems, able to minimize the human intervention at any stage of the product life, while ensuring the best possible performance.Synchronous reluctance (SynR) motors conjugate the efficiency of synchronous machines with the low-cost structure and absence of the permanent magnet (PM) typical of induction motors
Performance achievement is directly linked to the correct tuning of the inner current control loop, which is fully responsible for torque dynamics
This paper aims at preserving the manifold benefits of the relay feedback approach, trying to extend its application to an SynR motor AC drive
Summary
In the mainstream of energy and environmental global paradigms, the electric drives technology is moving toward more efficient motors and more intelligent control systems, able to minimize the human intervention at any stage of the product life, while ensuring the best possible performance. Synchronous reluctance (SynR) motors conjugate the efficiency of synchronous machines with the low-cost structure and absence of the permanent magnet (PM) typical of induction motors. In the light of the above frame, they represent a promising alternative in many low cost, mid-performance applications. Performance achievement is directly linked to the correct tuning of the inner current control loop, which is fully responsible for torque dynamics. The complexity of the algorithm and the high number of parameters to be tuned somewhat clashes with the demand for cost-effectiveness and simplicity that characterise SynR motor drives
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