I. Introduction
Induction motors are widely used in various industrial applications, such as: transportation, machine tools, servos, paper mill etc. This is due to induction motor inherent characteristics, which are: ruggedness, less maintenance requirements, simple construction, and lots more characteristics that are user friendly. It is the most used Ac drive in actuation industry, hence provide one of the major achievements in the fields of engineering since the invention of electricity [1]–[3]. However, induction motor is a constant speed drive, which make it impossible in variable speed applications, but with the development of several control techniques, like scalar control, vector field control, and other control techniques, induction motor can be use in a lots of industrial variable speed applications [4]–[6]. The finite element analysis FEA is based on the magnetic field analysis. It was first use for the computation of magnetic field in nonlinear electromagnetic device by Chari and Silvester in 1970 [7], [8]. This method can be use in analyzing: the magnetic circuit geometry, spatial distribution of stator windings and rotor bars, existing slots around air gap, and nonlinear behavior of ferromagnetic materials in a given machine. ANSYS Maxwell is a simulation software package that uses FEA method for the design and performance analysis of different type of Ac drive including an induction motor [2]. ANSYS Rotating Machinery Expert (RMxprt) and Maxwell are one of the packages in ANSYS, they are useful in the machine design and performance analysis at steady and dynamic state. ANSYS provides a complete virtual prototype laboratory for the design and development of machine tools. This software provides five tools for electrical machine design: RMxprt, Maxwell 2D/3D, Simplorer, Optimetrics and ANSYS mechanical/CFD [9]. In this paper RMxprt, Maxwell 2D are use in the design and analysis of the performance of 10hp three phase squirrel cage induction motor at different loading conditions. In order to provide motor performance calculations, RMxprt will automatically generates a complete transfer of the 2-D geometry of the motor, including all properties to Maxwell for detailed finite element analysis calculations. In this work, the behavior of the motor is analyzed and studied at rated load, intermittent, and at different percentages of the rated loads at a constant speed.