| Title |
A Study on the Torque Ripple of Dual Winding Motor According to Winding Arrangement at Fault Case |
| Authors |
Yongchul Kim ; Youngwoo Noh |
| DOI |
http://doi.org/10.5207/JIEIE.2024.38.1.074 |
| Keywords |
Dual-winding; EPS(Electrical power steering) motor; Mutual inductance; Winding arrangement |
| Abstract |
As automotive steering technology advances and becomes electrified, high-level safety designs such as fault-tolerant or fault-operation are required to maintain the primary function even when a failure occurs. For this purpose, a dual-winding electric motor was introduced in the steering system, making it possible to maintain the driver’s steering assistance function even in the event of breakdown cases. Dual-winding motors can take into account various winding arrangements depending on the pole-slot combination of machines, and accordingly, when driven with only one 3-phase winding, non-uniformity of the magnetic flux linkage to the phase windings may occur and eventually lead to different magnitudes of mutual inductance. This paper presents a mathematical model of dual-winding motors and studies how the imbalance of mutual inductance for each winding arrangement affects the characteristics of the electric machine. As a result, it was derived through the calculation results of the mathematical model that the electrical secondary torque ripple appears significantly in the winding method where the mutual inductance imbalance is significant, and the validity of the calculation results of the mathematical model was proven by comparing it with the finite element analysis results. |