The contra-rotating fan is an electromechanical device in which electromagnetic force and aerodynamic force coordinate\ntogether. Its operation process is affected by multiple factors and is also coupled with multiple variables. In order to further\nreveal its working mechanism, electromagnetic-fluid coupling model for contra-rotating fan was presented and relevant\nnumerical computations were performed by the combination of the motorsââ?¬â?¢ electromagnetic-field simulation and\nthe fanââ?¬â?¢s fluid-field simulation. Curves of electromagnetic torque and aerodynamic torque in time domain, respectively,\nfor two motors and two impellers of the fan were obtained, and then fast Fourier transform algorithm was used to analyze\ntheir harmonic components. Meanwhile, the resonance effect induced by the same-frequency components between\nthe harmonic electromagnetic and aerodynamic torques was investigated. Moreover, the impellerââ?¬â??motor interaction and\nmatching performance were explored so as to determine the optimal combination scheme of blade number in two-stage\nimpellers. The reasonableness of this scheme was validated experimentally. This heterogeneous physical-field simulation\nmethod targeted at electromagnetic-fluid coupling condition offers an important reference for optimizing the fan system.
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