Wide Speed Range Operation of Non-Salient PM Machines

Non-salient permanent magnet machines are considered poor candidates for flux weakening operations due to their inherent low-inductance characteristics. In this paper, a two-pole 24-slot non-salient PM machine design is proposed that can utilize a winding switching technique to achieve wide speed ra...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2016-09, Vol.31 (3), p.1179-1191
Main Authors: Atiq, Shahid, Lipo, Thomas A., Byung-Il Kwon
Format: Article
Language:English
Subjects:
Atmospheric modeling
Current-regulated voltage source inverter
Design engineering
Flux
flux weakening
Inductance
internal power factor
Inverters
Mathematical analysis
Motors
Permanent magnets
Stator windings
Stators
Strategy
Switches
Switching
Winding
winding switching
winding switching transient
Windings
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Summary:Non-salient permanent magnet machines are considered poor candidates for flux weakening operations due to their inherent low-inductance characteristics. In this paper, a two-pole 24-slot non-salient PM machine design is proposed that can utilize a winding switching technique to achieve wide speed range operation. A very wide speed range operation (from 3 to 1 ratio to as much as 13 to 1) is demonstrated. This is accomplished by simply rearranging the winding coils on the stator periphery. Moreover, a control strategy is proposed that not only utilizes the flux weakening using winding switching, but also flux weakening using a negative d-axis current to maximize the speed range of the machine. The machine is operated with two inverters to control the current in the machine winding over the entire speed range. A dq model for the machine is also presented. Analytical, simulated, and experimental results are provided to validate the proposed machine drive system.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2016.2547421