Analysis and Speed Ripple Mitigation of a Space Vector Pulse Width Modulation-Based Permanent Magnet Synchronous Motor with a Particle Swarm Optimization Algorithm

Abstract

A method is proposed for reducing speed ripple of permanent magnet synchronous motors (PMSMs) controlled by space vector pulse width modulation (SVPWM). A flux graph and mathematics are used to analyze the speed ripple characteristics of the PMSM. Analysis indicates that the 6P (P refers to pole pairs of the PMSM) time harmonic of rotor mechanical speed is the main harmonic component in the SVPWM control PMSM system. To reduce PMSM speed ripple, harmonics are superposed on a SVPWM reference signal. A particle swarm optimization (PSO) algorithm is proposed to determine the optimal phase and multiplier coefficient of the superposed harmonics. The results of a Fourier decomposition and an optimized simulation model verified the accuracy of the analysis as well as the effectiveness of the speed ripple reduction methods, respectively.

Speed Control of Matrix Converter-Fed Five-Phase Permanent Magnet Synchronous Motors under Unbalanced Voltages

“…Figure 2 shows the diagram of a five-phase voltage source inverter which is called the classic method of direct torque control in this article. There are two major drawbacks to applying inverter: low-frequency voltage harmonics and high torque ripple [5][6][7]. To eliminate these problems, the direct torque control method with a three-phase to five-phase matrix converter ( Figure 3) is introduced [8][9][10].…”

Optimal Design of the Rotor Structure of a HSPMSM Based on Analytic Calculation of Eddy Current Losses

“…[1][2][3][4][5][6][7]. Compared with traditional motors, the losses per volume and the working temperature rise of HSPMSMs are significantly increased.…”

Proportional-Type Performance Recovery DC-Link Voltage Tracking Algorithm for Permanent Magnet Synchronous Generators

“…Eliminating the external rotor excitation removes the rotor losses, which improves the PMSM efficiency dramatically. Moreover, the absence of rotor winding eliminates not only the slip rings but also the brushes, which leads to a considerable reduction of the maintenance costs [1][2][3][4][5][6].…”

“…J dω(t) dt = −Bω(t) + T m (t) − T e (i d (t), i q (t)), (3) ∀t ≥ 0, where i d (t), i q (t), and ω r (t) := Pω(t) denote the d-q axis' current and electrical speed, respectively, and ω(t) and P represent the mechanical speed and the number of pole pairs, respectively. The PMSG parameters R s , L d , L q , λ PM , B, and J represent the stator resistance, d-q inductances, magnet flux, viscous friction, and rotor moment of inertia, respectively, and T m (t) is the input mechanical torque.…”