Fault-Tolerant Control and Torque Ripple Reduction in a Modular Drive of a Non-Sinusoidal Three-Phase Permanent Magnet Synchronous Motor
Subject Areas : electrical and computer engineering
M. Jafari Sejzeh
1
,
A. Halvaei Niasar
2
1 - Dept. of Elec. and Comp. Eng., University of Kashan, Kashan, Iran
2 - Dept. of Elec. and Comp. Eng., University of Kashan, Kashan, Iran
Keywords: Torque ripple, open-end winding three-phase PMSM, reliability, H-bridge inverter, fault-tolerant control,
Abstract :
Permanent Magnet Synchronous Motors (PMSMs), due to their outstanding features such as high torque density and efficiency, as well as high reliability, have now secured a special position in many industrial applications and mass production applications. In order to further enhance the reliability of PMSM drives, an open-end winding structure is used for the motor, where each winding is supplied by a single-phase inverter. In some applications, to maximize reliability and achieve complete modularity of the drive, separate microcontrollers are employed to control each single-phase inverter. The use of this modular structure makes it impossible to utilize common modeling and control methods of three-phase PMSMs in two-axis reference frames. Therefore, in this research, a method of independent modeling and control of each motor phase in a stationary three-axis coordinate system is used. Moreover, under fault conditions and the loss of one phase, a fault-tolerant control method is employed to maximize torque production capability by the healthy phases while minimizing torque ripple caused by the second harmonic. The validity of the presented analyses and control method is proven through simulation in Simulink software. Additionally, to verify the presented theories and simulation results, the results of several experimental tests under fault conditions are provided.
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