Performance analysis and operating limits of dual inverter open winding IPMSM drives
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Date
2018-12-30
Authors
Watthewaduge, Gayan Madusanka Amaradasa
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Abstract
Operating capabilities of a dual inverter Open Winding Interior Permanent Magnet Synchronous Motor drive are investigated and compared with those of a conventional single inverter drive in Maximum Torque per Ampere and Field Weakening regions. To predict the performance and operating limits of the drive systems with improved accuracy, the impact of saturation on inductances and Permanent Magnet flux linkage values are taken into account, and core, copper, friction and windage, and solid losses (due to skin and proximity effects and magnet losses) are considered in a wide speed range. It is shown how core saturation affects the d- and q-axis inductances and saliency ratio, and electromagnetic and mechanical losses significantly change in various operating points. It is revealed how the above effects may affect the operating capability of the machine in different drive configurations. Different active and reactive power sharing assumptions are made in the dual inverter drives, and it is shown how each of the related controllers is accordingly defined. It is demonstrated that in certain operating regions of the open
winding machine’s torque versus speed envelope, the original active and reactive power sharing principles and the defined controllers have to be modified, otherwise the machine may not be able to operate throughout its entire anticipated operating points. Performance prediction is conducted using machine’s electromagnetic parameters and losses that are obtained via Finite Element Analysis, coupled with an optimization algorithm to find optimal operating points in Maximum Torque Per Ampere and Field Weakening regions. The analytical findings are further validated against experimental results obtained from a 1-kW dual inverter Interior Permanent Magnet Synchronous motor drive.
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Keywords
Open winding PMSM drive, Field weakening, Maximum torque per ampere, Saturation, Losses
Citation
G. Watthewaduge, M. S. Toulabi and S. Filizadeh, "Performance Prediction of a Dual Inverter. Open Winding IPMSM Drive Considering Machine's Saturation and Losses," 2018 XIII International Conference on Electrical Machines (ICEM), Alexandroupoli, 2018, pp. 1643-1649
G. Watthewaduge, M. S. Toulabi and S. Filizadeh, "Analysis and Control Considerations of an Open Winding IPMSM Drive in MTPA and FW Regions," 2018 21st International Conference on Electrical Machines and Systems (ICEMS), Jeju, 2018, pp. 137-142.
G. Watthewaduge, M. S. Toulabi and S. Filizadeh, "Analysis and Control Considerations of an Open Winding IPMSM Drive in MTPA and FW Regions," 2018 21st International Conference on Electrical Machines and Systems (ICEMS), Jeju, 2018, pp. 137-142.