I am working to optimize the performance of a single-phase induction motor. I performed the parametric optimization and efficiency increased from 45 percent to 71 percent and also other parameters improved but rated torque decrease from 0.75Nm to 0.56Nm. I wanna improve the torque as well. I have also tried different slots types of rotor. If torque improved that decrease the efficiency of the motor. How can I increase the rated torque?