Thermal Robustness Redesign of Electromagnet Under Multi-Physical Field Coupling

AbstractAiming at the durability problem of the proportional electromagnet used in the proportional valve of engineering machinery, in order to improve its thermal failure resistance under random load conditions, a parametric redesign model of the proportional electromagnet was proposed based on the multi-physics coupling theory and robust optimization theory. This article takes the proportional electromagnet with a basin-type suction structure as the research object. The parameter model was verified through steady-state proportional electromagnet tests and temperature distribution tests. On the premise of ensuring the accuracy of electromagnetic calculation force, the conductivity and heat transfer parameters with fuzzy magnitude in the system were calibrated. Taking the key structural parameters of the proportional electromagnet and coil as the control factors, and the enameled wire diameter of the coil caused by the uncertainty of the production process conditions as the noise factor, an orthogonal experiment was designed based on the Taguchi method, and the thermal robustness redesign evaluation function of the proportional electromagnet was defined. Multi-factor weighted form. The thermal load of the proportional electromagnet obtained from the excavator field test was used as the response to calculate the heat source. Under the constraint of allowable temperature rise that can not cause coil insulation failure, a redesign method for key structural parameters that minimizes changes in system response under noise interference is given. Studies have shown that coil length and number of turns are the main factors affecting the thermal robustness of proportional electromagnets. The window shape of the coil is determined by the winding process and determines the magnetic properties and heat transfer capabilities of the system. The thermal robustness redesign method of proportional electromagnets proposed in this article has engineering reference value for the customized design of electromechanical products under magnetothermal coupling conditions.