A Standstill Method to Measure Electromagnetically Induced Torque Ripple of Permanent Magnet Synchronous Machines

2020 ◽  
Vol 69 (10) ◽  
pp. 7627-7635 ◽  
Author(s):  
Alireza Pouramin ◽  
Rukmi Dutta ◽  
Mohammad Farshadnia ◽  
Muhammed F. Rahman
Keyword(s):  
Permanent Magnet ◽  
Torque Ripple ◽  
Synchronous Machines ◽  
Permanent Magnet Synchronous Machines

scholarly journals Predictive Trajectory Control with Online MTPA Calculation and Minimization of the Inner Torque Ripple for Permanent-Magnet Synchronous Machines

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5327
Author(s):  
Simon Decker ◽  
Matthias Brodatzki ◽  
Benjamin Bachowsky ◽  
Benedikt Schmitz-Rode ◽  
Andreas Liske ◽  
...  
Keyword(s):  
Permanent Magnet ◽  
Real Time ◽  
Control Period ◽  
Torque Ripple ◽  
Trajectory Control ◽  
Synchronous Machines ◽  
Permanent Magnet Synchronous Machines ◽  
Flux Linkage ◽  
Maximum Torque ◽  
Dynamic Operation

This paper presents an extended predictive trajectory control scheme combined with an inner torque ripple minimization considering the current-, flux-linkage-, and voltage-planes of permanent magnet synchronous machines. The extension of a fundamental machine model with flux-linkage harmonics allows the calculation of the inner torque ripple and enables its minimization. For this, the control is divided in two cases: (1) The dynamic operation or large signal behavior which uses the maximal torque gradient for the trajectory strategy during each control period for fastest dynamic operation, and (2) The stationary operation or small signal behavior, utilizing a real time capable polynomial approximation of the rotor position dependent torque hyperbolas (iso-torque curves) of permanent magnet synchronous machines for the ideal torque to current reference values. Since dynamic and steady-state operation is covered, torque to current look-up tables, such as maximum torque per ampere (MTPA)/maximum torque per volt/voltage (MTPV) look-up tables, are not required anymore. The introduced, new control approach is implemented in Matlab/Simulink based on finite element analysis and measured data. Furthermore, test-bench implementations based on measurement data are presented to show the real-time capability and precision.

scholarly journals Nonlinear Modelling, Flatness-Based Current Control, and Torque Ripple Compensation for Interior Permanent Magnet Synchronous Machines

Energies ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1590
Author(s):  
Felix Veeser ◽  
Tristan Braun ◽  
Lothar Kiltz ◽  
Johannes Reuter
Keyword(s):  
Permanent Magnet ◽  
Closed Loop ◽  
Torque Ripple ◽  
Current Control ◽  
Synchronous Machines ◽  
Permanent Magnet Synchronous Machines ◽  
Nonlinear Mathematical Model ◽  
Interior Permanent Magnet ◽  
Rotor Angle ◽  
Torque Ripples

A nonlinear mathematical model for the dynamics of permanent magnet synchronous machines with interior magnets is discussed. The model of the current dynamics captures saturation and dependency on the rotor angle. Based on the model, a flatness-based field-oriented closed-loop controller and a feed-forward compensation of torque ripples are derived. Effectiveness and robustness of the proposed algorithms are demonstrated by simulation results.

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