Optimization of design parameters of a limited angle torque motor using analytical hierarchy process and axiomatic design theory

Abstract

The limited angle torque motor (LATM) has been widely used in systems that require limited motion, ranging from the simple ON–OFF servo valves to the accurate tracking of a reference signal. This paper presents the optimum design procedures of a LATM. According to a request from industry, a two-pole LATM with a toroidal armature winding was designed based on analysis of magnetic equivalent circuit of motor structure, and using selected ferromagnetic material and rare-earth permanent magnets. To select the best design solution, the decision-making tools called analytical hierarchy process (AHP) and axiomatic design (AD) methodologies are employed, respectively. Considering the industrial requirements, AD is proposed to minimise the effect of expert’s judgments and pursue the simple design procedure. Comparison of the AD and AHP methodologies shows that the AD has more confirmation with the industrial design ranges. It requires minimum experts’ interventions and reduces the design computation time.