| Title |
PWM Variable Carrier Generating Method for OEW PMSM with Dual Inverter and Current Ripple Analysis according to Zero Vector Position |
| Authors |
Jae-Hoon Shim ; Hyeon-Gyu Choi ; Jung-Ik Ha |
| DOI |
10.6113/TKPE.2020.25.4.279 |
| Keywords |
OEW(Open-End Winding) PMSM; ZSC elimination; PWM patterns; Carrier; Current ripple |
| Abstract |
An open-end winding (OEW) permanent magnet synchronous motor with dual inverters can synthesize large voltages for a motor with the same DC link voltage. This ability has the advantage of reducing the use of DC/DC boost converters or high voltage batteries. However, zero-sequence voltage (ZSV), which is caused by the difference in the combined voltage between the primary and secondary inverters, can generate a zero-sequence current (ZSC) that increases system losses. Among the methods for eliminating this phenomenon, combining voltage vector eliminated ZSV cannot be accomplished by the conventional Pulse Width Modulation(PWM) method. In this study, a PWM carrier generation method using functionalization to generate a switching pattern to suppress ZSC is proposed and applied to analyze the control influence of the center-zero vector in the switching sequence about the current ripple. |