| AS a new type of blushless compound machine, axial magnetic-field-modulated brushless double-rotor machine(axial MFM-BDRM for short)is basically applied in energy converter of HEV. This machine can be reliable in continuously variable transimission, which has a great practical significance and scientific values.Firstly, field analysis is taken separately for the permanent magnetic field and stator amature field of axial MFM-BDRM. The relationship of number of ferromagnetic blocks, pole pair number of magnetic field and pole pair number of amature field are given. The mathematical model of the speed and torque among three parts is established. The FEA model is bulit to evaluate the correctness of the field and torque analysis.Secondly, the distribution of winding is deduced. Fraction slot concentration winding model,distribution full-pitch winding model and distribution short-pitch winding model are picked for contrast analysis; Halbach matrix magnetic structure machine are compared with the aixal flux structure machine, to provide the reference for the structural selection of the axial MFM-BDRM.Thirdly, the seleting principle for the pole pair number of magnetic field, pole pair number of amature field and the number of ferromagntic block numbers is deduced. A conclusion is given that the performance of the machine will be affected if the pole pair number of mangetic field and the number of ferromagnetic blocks have the greatest common divisor. It lays the foundation of improving the electromagnetic performance of the axial MFM-BDRM. Diameter ratios of the models are researched on the influence of electromagnetic torque. Loss is evaluated after the diameter ratio is picken.Finally, the permanent magnet thickness, the pole-arc coefficent, the ferromagnetic block thickness, the span of mdulating ring has an influence on electromagnetic torque by the FEA analysis;when the axis of magnet rotor is not in z-axis, an uneven length of air-gap will have an influence on motor performance. |
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