Time-Optimal Transition Method for Six-Step Operation of PMSM via Geometric Prediction of Flux Trajectory

This article analyzes the time-optimal trajectory of the stator flux vector in a permanent-magnet synchronous motor (PMSM) under the six-step operation. In the rotor reference frame (RRF), the time-optimal trajectory of the flux vector takes the form of a detour to the target locus, which poses chal...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2024-07, Vol.71 (7), p.6764-6774
Main Authors: Cho, Hyung-June, Kwon, Yong-Cheol, Sul, Seung-Ki
Format: Article
Language:English
Subjects:
Closed loops
Control systems design
Flux control
Optimal control
Permanent magnet motors
Permanent magnets
permanent-magnet synchronous motor (PMSM)
Rotors
six-step operation
Stators
Steady-state
Switches
Synchronous motors
time-optimal control
Torque
Trajectory
Trajectory analysis
Trajectory control
Trajectory optimization
Voltage control
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Summary:This article analyzes the time-optimal trajectory of the stator flux vector in a permanent-magnet synchronous motor (PMSM) under the six-step operation. In the rotor reference frame (RRF), the time-optimal trajectory of the flux vector takes the form of a detour to the target locus, which poses challenges for implementing the time-optimal trajectory with a conventional controller designed in RRF; an open-loop structure is required. On the other hand, in the stationary reference frame (SRF), the time-optimal trajectory appears as a shortcut when the flux angle increases and a detour when the flux angle decreases. Based on the analysis in SRF, this article proposes a closed-loop time-optimal transition method for the six-step operation of a PMSM. The proposed method applies a voltage vector so that the flux vector follows the time-optimal trajectory via prediction. The performance of the proposed method is verified through simulations and experiments with a 30 kW-PMSM for HEV applications.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2023.3310078