Optimum torque control of permanent-magnet AC Machines in the field-weakened region

This paper presents a novel current regulation algorithm for permanent-magnet ac (PMAC) machines that provides maximum torque-per-ampere capability in the entire field-weakened region. The algorithm provides robust current regulation with maximum efficiency and torque capability for PMAC machines de...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2005-07, Vol.41 (4), p.1020-1028
Main Authors: Gallegos-Lopez, G., Gunawan, F.S., Walters, J.E.
Format: Article
Language:English
Subjects:
AC machines
Algorithms
Batteries
Commands
Control
Current control
Dynamic response
Electric potential
Field-weakened operation
Industry Applications Society
Optimization
permanent-magnet ac (PMAC) machine control
Regulators
Temperature distribution
Torque
Torque control
vector control
Vehicle dynamics
Vehicles
Voltage
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Summary:This paper presents a novel current regulation algorithm for permanent-magnet ac (PMAC) machines that provides maximum torque-per-ampere capability in the entire field-weakened region. The algorithm provides robust current regulation with maximum efficiency and torque capability for PMAC machines despite significant changes in the voltage source and machine parameters. The algorithm identifies when the current regulator starts to saturate and determines the optimum d-axis current command for the machine. The q-axis current command is determined from the torque command and d-axis current feedback. When the voltage angle reaches the maximum angle, the current magnitude is decreased to provide maximum torque per ampere. Experimental results from a machine prototype show that the algorithm provides good overall dynamic response and smooth transitions into the field-weakened region with maximum torque-per-ampere capability in all four quadrants of operation.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2005.851588