Temperature field self-adaptive control method and system for neodymium iron boron vacuum sintering furnace

Abstract

The invention belongs to the technical field of temperature control, and particularly relates to a temperature field self-adaptive control method and system for a neodymium iron boron vacuum sintering furnace, and the method comprises the following steps: collecting the actually measured temperature of each thermocouple in an upper area and a lower area in the furnace according to a control period, and respectively averaging to obtain the upper area average temperature and the lower area average temperature; calculating the difference between the maximum value and the minimum value of the actually measured temperature of each thermocouple to obtain an instantaneous temperature difference; taking the maximum value of each instantaneous temperature difference in the preset time window as a temperature difference extreme value; multiplying the temperature difference polar value by a preset expansion coefficient to obtain a discourse domain upper limit, and scaling the fuzzy set boundary in equal proportion according to the discourse domain upper limit; and counting the activation frequency of each fuzzy rule in the preset window, and calculating the information entropy according to each activation frequency to obtain the rule activation entropy. According to the method, the problem of control misalignment caused by the dramatic change of the temperature difference magnitude in each sintering stage is effectively solved, and the residual magnetism consistency and the yield of products in the same batch are remarkably improved.

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