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传统的扬声器热流建模是用一个等效电路来表示的,它是由两个不同时间常数的RC电路串联,并假定集总元件的参数与信号幅值无关。对于强迫空气对流冷却方式,这一简单的模型却不适用,而当音圈速度(或磁间隙中的空气速度)很高时,强迫对流冷却却是行之有效的的散热机理。考虑到电-力与热学机理之间的非线性相互作用,提出了一个大信号热学模型。该模型及其参数可以在实例单元上进行实际测量加以验证,还对热流的主要路径加以确定,并讨论了提高扬声器单元功率承受能力的方法。
Traditional speaker heat flow modeling is represented by an equivalent circuit, which is connected in series by two RC circuits of different time constants and assumes that the parameters of the lumped element are independent of the signal amplitude. This simple model does not apply to forced air convection cooling, and forced convection cooling is an effective cooling mechanism when the voice coil speed (or air velocity in the magnetic gap) is high. Considering the nonlinear interaction between the electro-mechanical and thermal mechanisms, a large-signal thermal model is proposed. The model and its parameters can be verified by actual measurements on an instance cell. The main path of the heat flow is also determined and the method of increasing the power-handling capacity of the loudspeaker unit is discussed.