The optimal design for improving efficiency of the three phase induction motor

This paper presents the design of some factors of three phase induction motor to maximize the efficiency using the design of experiments (DOE). The fractional factorial designs are used for the screening six design factors and the response surface methodology (RSM) is applied to get the efficiency-maximized points from the screened four factors. The design is also performed to consider the flux density of the stator and rotor teeth. The simulation based on equivalent circuit of induction motor is used to obtain the responses for DOE. From simulation results, the efficiency of the initial model can be improved by 3.3% without increasing motor volume and electrical steel grade.

I. Introduction

The electric motors consume over half of all electricity and so, the need for energy conservation is accelerating the requirement for increased levels of electric motor efficiency [1]. Improving efficiency to higher level through the selection of an appropriate combination of the design factors can be effective way to reduce the consumption of electricity. In order to maximize efficiency, new technology has been developed such as copper die-casting motor and low core loss electrical steel. However, these methods bring cost-rise and need special manufacturing technology. In this paper, we study the efficiency-maximizing design of the effective factors such as slot height, width and coil diameter by using the design of experiments (DOE) without material and volume change.