Design And Optimization Of Three Phase Squirrel Cage Induction Motor Used For General Purpose Application

Abstract

Interest in potential of optimization of electric powered motor design is excessive due to the truth of extended price of electrical power and pressures for its conservation, plus the accelerated competition in world markets. The goal of the optimization technique is normally to decrease the price of the machine or to maximize the efficiency of the machine. This thesis present an optimum design of three phase squirrel cage induction motor which is help for the producing of this machine in Ethiopia. First mathematical modelling used to be performed with the aid of calculating all the stationary and rotating phase of the motor. During the modelling the design parameters had been determine which is confined primarily based on the advantage and disadvantage of increasing and lowering of specific electric and magnetic loading. After the modelling was carried out with the aid of the assist of Rotational machine Expert (RMxprt) software from ANSYS cooperation was applied for simulation. The simulation result and manual design used to be in contrast which have very minimal deviation between the two results. By optimizing the dimension and shape of stator and rotor slots the efficient motor was designed. The result of simulation show that the starting torque, breakdown torque and efficiency of this design had been improved compared with the existing 11kW squirrel cage induction motor. According to International Electrician Commission (IEC) standard this existing motor operate with starting torque of 157.52Nm, break down torque of 214.8Nm and rating efficiency of 89.8%. The result of simulation indicated that the starting torque is increased to 161.281Nm, the break down torque additionally elevated to223.287Nm and the rating efficiency improved to 92.4%. Therefore due to enhancement of its efficiency the modelled motor have a long existence time and minimal operating cost when evaluate with the current one. Finally two dimensional (Maxwell 2D) used to be applied for evaluation of the magnetic field and flux density has been performed for the designed model.