The Effect of Stator Outer Diameter and Length on the Performance of Three-Phase Induction Motor at Constant Volume

For induction motors covering the vast majority of the industry, the bulk package volume determines the amount of raw material used, i.e., its cost. In this study, the effect on motor performance is investigated by changing the stator outer diameter and motor length without changing the amount of steel sheet. While designing a low-power induction motor, other motor parameters except the motor stack length and stator outer diameter were calculated analytically, and the stator outer diameter and stack length were obtained using the surrogate optimization (SO) technique. The electric motor modeled with the obtained values was analyzed using Maxwell. In this context, the mechanical power of the designed motor was primarily determined as 1.1 kW. A three-phase induction motor is designed for the considered 1.1 kW of mechanical power. The stack package volume of this motor is calculated as 1340.89 cm3. This motor stack package volume also indicates the amount of steel sheet to be used. Therefore, the effect on motor performance is investigated by changing the stator outer diameter and length of the motor without changing the amount of steel sheet. The number of stator and rotor poles of the motor is 36 and 28, respectively. As a result of the analysis, an efficiency value of 80.30% is obtained for the case where the Kd value, which expresses the ratio of the motor stack length to the stator outer diameter, is 0.113. © 2025 Istanbul University. All rights reserved.