Fault-Tolerance Capability Comparison of Different Connection Types for Dual-Three Phase Motors

Dual three-phase motors (DTPM) are gaining increasing popularity in motor drive applications, especially requiring high reliability. For dual three-phase motors, there are different types of the stator winding connections. This paper analyzes the fault-tolerant capability of different stator winding connections of DTPM, gives a detailed comparison, and finally recommends the symmetrical 6-phase connection with single natural point as the best choice for fault-tolerant operation.