Abstract
There are different approaches to improve the efficiency of induction motors. In this paper, the considered approaches include, design of the rotor slot, rotor slot shape, and stator and rotor diameters which are applied on a 30-kW 3-phase, 4-poles, 48-stator slots, and 44-rotor squirrel cage induction motor. Comparison of analytical, simulation and experimental results confirm the proposed FEM-based model of set-up induction motor. The sensitivity analysis of efficiency considering the variations of rotor slot dimensions, stator outer diameter, and stator and rotor diameters have been applied on the case-study. The results of the GA-based optimal design of the rotor slot dimensions showed a 0.32% improvement in motor efficiency. On the other hand, changing the motor core diameters has more effects on motor efficiency so that, when the stator and rotor outer diameters were increased simultaneously, the efficiency was increased by 0.55%. However, if the stator outer diameter just increased, motor efficiency increased by 0.76%. Finally, the economic evaluation was accomplished to validate the optimal approach of motor design for three cases of electricity consumption per kWh.
Highlights
THE SQUIRREL cage induction motors are extensively used in many industrial fields and home applications because of their simple structure, reliability, low cost, robustness, less maintenance and ability to work in inimical https://orcid.org/0000-0002-1008-2180Manuscript received May 06, 2020; accepted January 05, 2021
The mathematical equations related to the motor efficiency and power factor are described in which they are proportional to the motor equivalent circuit [21]
The results show that the optimal motor efficiency in this approach increases by 0.32% in comparison with the conventional motor efficiency
Summary
THE SQUIRREL cage induction motors are extensively used in many industrial fields and home applications because of their simple structure, reliability, low cost, robustness, less maintenance and ability to work in inimical https://orcid.org/0000-0002-1008-2180Manuscript received May 06, 2020; accepted January 05, 2021. THE SQUIRREL cage induction motors are extensively used in many industrial fields and home applications because of their simple structure, reliability, low cost, robustness, less maintenance and ability to work in inimical https://orcid.org/0000-0002-1008-2180. One of the ways to increase the starting torque is adjusting the resistance and reactance of the rotor, especially the upper part of rotor slot resistance according to the skin effect in the motor startup. To reach this goal, it is necessary to design the rotor bars of the squirrel cage induction motor. The slot depth design is another procedure to improve the starting torque this design increases rotor slot leakage reactance and decreases motor efficiency [1,2,3]
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