Abstract
The multiphase motor drive systems have become a focus in many application areas such as ship electric propulsion, urban mass transit, aerospace, and weapon equipment, as they are characterized by high power density, low torque pulsation as small torque ripple, large output power, strong fault tolerance, and high reliability. However, with the increase of the phase number of the motor, the current harmonic component increases correspondingly, which leads to the decrease of the control performance compared with the three-phase system. In order to overcome this challenge, implementation method of driving control technology for seven-phase permanent magnet synchronous motor (PMSM) based on SVPWM algorithm is discussed thoroughly in this paper. Simulink and experiments have been developed to check its practical feasibility. The results show that the near-six vector SVPWM algorithm (NSV-SVPWM) achieves better performance than other methods.
Highlights
Multiphase permanent magnet synchronous motor (PMSM) is widely used in special occasions such as high current and high voltage, and it works in the case of low voltage and high power drive without any restriction of current or voltage
Due to the increase of the phases of motors, the current harmonic contents of multiphase motor system are larger, which leads to the decrease of the control performance compared with the three-phase system [6, 7]. e inverter nonlinearity is the key source of current harmonics
It proves the feasibility of the NSV-SVPWM algorithm in the seven-phase PMSM drive control system. e experiment results are in agreement with the theoretical analysis and simulation results
Summary
Multiphase PMSM is widely used in special occasions such as high current and high voltage, and it works in the case of low voltage and high power drive without any restriction of current or voltage. The mathematical model of the static coordinate system of the seven-phase PMSM is analyzed in detail. A more complete framework of control technology of seven-phase PMSM for low-order current harmonics suppression is proposed. Before studying the driving control system of the seven-phase PMSM, the mathematical model of the motor is established at first. In the stationary coordinate system, the flux equation, the stator voltage equation, the electromagnetic torque equation, and the mechanical motion equation are important mathematical model of the seven-phase PMSM. According to equations (2)–(6) of electromagnetic torque equation, it can be seen that the straight axis and quadrature axis currents of stator of seven-phase PSMS are coupled with each other, which brings inconvenience to the subsequent research on vector control theory. Erefore, it is necessary to select appropriate spatial transformation and simplify the mathematical model of the seven-phase PMSM. 7 2 αΨiq, where iq is the component of stator current on the q axis
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