Taguchi robust design for the multi-response with consideration for the manufacturing tolerance used in high speed air blower motor

In mass production, manufacturing tolerances are unavoidably generated in the rotor between the core and the permanent magnet. Because back electromotive force (EMF) and cogging torque are influenced by manufacturing tolerances, it is necessary to improve the tolerances by changing specific factors. In this paper, a Taguchi robust design is conducted on an air blower motor that is used to circulate the air in the fuel cell stack. Because the Taguchi robust design cannot achieve a multi-response, a multi-response signal-to-noise (MRSN) ratio based on the Taguchi robust design is employed to consider the back EMF and cogging torque. Finally, an optimum shape is determined to select the combination of control factors in the robust design, and the back EMF and the cogging torque are improved.