| The rapid development in the modern manufacturing demands the design of motor to be more accurate and faster. And CAD techniques can satisfy this requirement. Now the CAD software, which features reliable and reasonable system structure and information database, can be developed rapidly by way of advanced computer hardware and programming techniques. The better design methods, of course, are required for good CAD software of an electric machine, but the more important thing is that an accurate design model of the electric machine is needed.The software package of computer-aided design and analysis for the large and medium induction motors, which is developed by Western House Cooperation of USA, was introduced into China early in the 90's. It not only has powerful functions and excellent stability, but also performs various computations and produces accurate results. Because of some existent differences between China and USA in computer hardware and software, engineering units and industry standards, the package didn't play its role well enough. And correspondingly, the advanced technique couldn't be transformed into productive forces.The paper deals with redevelopment of the package software of Western House Cooperation. Now the package has been redesigned and transplanted onto the computers that are widely used by technicians in China and used under the environment of Windows operating system. A program is developed to convert the British unit of original package into SI unit, and a new and friendly man-machine interface is designed to change the original data input and output that use paper cards and printer into a window-typed one.The new package remains the original advantages in computing accuracy and varieties. And considering the engineering practices of motor industry in China, it makes some improvements to adapt to the requirements of motor designing technicians. It will play an important role in the development of motor industry in China.
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