Active Power Allocation Strategy for a Novel Wireless Open-Winding Motor System With Improved Antimisalignment Capability
Yu Chen, Chun Gan, Haochen Shi, Kai Ni, Ronghai Qu
Abstract
This article proposes a wireless open-winding motor (WOWM) system, where noncontact operation can be achieved with the magnetic coupler. Thus, the flexibility and reliability of the WOWM system can be improved. Two isolated dc voltage ports for the open-winding motor can be obtained with only one dc voltage source, which facilitates the application of the system. The zero-sequence current in the motor winding can be suppressed and the dc link voltage utilization rate can be maximized owing to the isolated dc link structure. Besides, the operation characteristics of the WOWM system are analyzed in detail. The decoupled dual-receivers are designed, which ensures that the ratio of dc link voltages is load-independent. Moreover, the influences of misalignment on the WOWM system, including the overmodulation and increased phase current ripple are presented. The dc link voltage regulation (DVR) and active power allocation (APA) strategy are further proposed. The dc link voltage reference is identified based on the operating state of the motor for high performance operation. The allocation coefficient, <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">k</i> is adjusted according to the extent of misalignment, which improves the antimisalignment capability. The feasibility of the WOWM system and the effectiveness of the DVR and APA strategy are verified by experiments.