by Yoshio MIYAKE, Yasutaka KONISHI, & Hiroshi UCHIDA
Two types of compact, brushless-DC canned motor pumps have been developed for use with various systems and equipment that are operated at flow rates of 3 L/min or less and under a total head of 10 m or below. Although there are many pumps in this class, namely positive displacement and turbo types, available in the market, there have been few that were compact and lightweight, and featuring high efficiency, long life, and low pulsation. Development of two pumps was carried out in parallel, that of a traditional centrifugal pump optimally configured to realize these concepts, and that of a gear pump for small flow rate application. These pumps are effective for use with compact systems and equipment which are operated long hours. Preparation is underway to release these pumps into the fuel cell, solar-energy-generation system, air conditioning and heat recovery system, and micro air-cooling system markets.
Keywords
Brushless-DC, Centrifugal pump, Gear pump, Permanent magnet rotor, Neodymium, Low pulsation, Friction loss, Canned motor, Impeller, Micro-pump