| Just as its name implies, the electro-machine is composed of electromagnetism and mechanism. For the hydro-generator designer, the most important point is how to get the best conjunction by taking into account the electromagnetism and mechanism. The hydro-generator is the key equipment of hydro-power plant, its cost is very high and has large optimization room. Based on the author's practical experience, this paper analyzed and investigated systemically the lower cost design methods of hydro-generator in the aspect of electromagnetism and mechanism, this paper also lists a lot of datum and design examples.First, this paper summarized the status of large hydro-generator design, introduced the fact issues about large hydro-generator design, especially how to balance the cost and performance.Secondly, this paper discussed how to choice economically the proper parameter by analyzing the character of the hydro-generator design, so as to ensure the whole design in line with the common norms on large hydro-generator, and summarized the ways how to decide the main dimensions.Then, the design concepts of important structure parts, such as stator, rotor, main shaft, bearing, bracket, etc. have been discussed, and presented the practical design method to lower the cost of these structures.Finally, the other factors which may influence the cost of large hydro-generator have been discussed, such as the material, ventilation, norm, transportation, industry, environment, test, etc.All these design methods are concise but completed, it is easy to understand and practicable, and especially applicable for the basic design of large hydro-generator, it is helpful for designer to grasp the key point rapidly and effectively in design stage.This paper summarized the methods how to design the large hydro-generator with lower cost by examples, the purpose of this paper is to be used for reference to control effectively the cost of large hydro-generator and balance the performance and cost.
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