Experimental Research On New-type Of Transverse-Flux Permanent Magnet Machine (TFPMM) For EV

Along with the rapid development of automobile industry, the problems of energy crisis and environmental pollution become increasingly serious. The industrialization of electric vehicle (EV) bring a new dawn for settling the two big problems. Transverse Flux Permanent Magnet Machine (TFPMM) is a new type of machines researched extensively in recent years. With high torque density which makes it suitable for the low speed and high torque application, TFPMM has broad prospects as in-wheel motors. Basing on a novel axially magnetized TFPMM and its theoretical expectation, the purpose of this thesis is to make a comprehensive experimental research.A comprehensive introduction to the principle, topologies, present research and disadvantages of TFPMM is performed first. The characteristic and electromagnetic relationship of a 3 kW TFPMM prototype are analyzed in detailed, and simulation is done to analyze the effect of imprecise position detection of the rotor.Sufficient experimental tests are operated on the prototype later. Firstly, no-load test and loss analysis are finished using two driving modes of BLDC and synchronous machines. Secondly, the comparative experiment using the driving mode of BLDC with and without position sensor is operated, and it indicates that precise positioning is difficult if using position sensor. Thirdly, load test using the driving mode of synchronous machines is operated, and it shows better quality than that of BLDC. At last, the relationship of terminal voltage and phase current is measured, and adjusting laws of power factor and efficiency are discussed.To research on the control strategy of the prototype, the knowledge of vector diagram is adopted. First, the self-controlled frequency conversion speed adjusting strategy with id=0 is analyzed, and the relationship of electromagnetic parameters is deduced. The results show that it is suitable to TFPMM very well. Then, the relationship of power factor and phase current angle is also analyzed to improve the performance of the machine. Last, flux-weakening control strategy is ameliorated to make the machine has broader speeding range of constant torque control and better speed adjusting effect.