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In this paper a topology optimal design of a permanent magnet disc motor (PMDM) based on total motor weight minimisation is performed. In the design procedure performed on the PM disc motor, genetic algorithm, as an optimisation tool is used. The application of the permanent magnet disc motor is in electric vehicle and therefore it is essential the weight of the motor to be as minimal as possible. Comparative values of the improved motor parameters in relation to the basic model for both models are presented.