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1、前言在日本,由于过多地抽吸地下水,部分地方产生了地基下沉、盐害等的环境破坏,但是,有效地利用宝贵的地下水资源的潜力仍然是很大的。地下水不仅用于自来水、工业和农业上,而且还可以利用地下水具有的恒温性用于大雪地区的融雪和热泵的热源。另外,就是在国外,例如在东南亚的农业、中近东的灌溉和自来水方面也被广泛地利用。荏原公司多年以来就制造抽吸地下水的深井泵,并不断地进行研究和试制。这样做的结果,使电动机
1. Introduction In Japan, the potential for effective use of valuable groundwater resources is still considerable due to the excessive suction of groundwater and the environmental damage caused by subsidence and salt damage in some areas. Groundwater can be used not only for running water, industry and agriculture, but also for the constant temperature of groundwater that is used to heat snowmelt and heat pumps in heavy snow areas. In addition, it is widely used in foreign countries, such as agriculture in Southeast Asia and irrigation and running water in the Middle Near East. Ebara Corporation has been manufacturing deep-well pumps for pumping groundwater for many years and has been conducting research and trial production. The result of this is to make the motor