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In recent years, driving mechanisms of industrial machinery is shifting to applying direct drive systems. To respond to these requests, market requires slow-speed high torque motor, which is called direct drive motor;gDDmotorhof built-in type with liquid cooled structure. So, we have begun to develop built-in type DDmotor with liquid cooled structure that targets machine tools market. To meet the requests, the developed motor has taken various technologies (Surface Permanent Magnet structure, optimum slot combination, concentrated winding, stator molding, etc). We achieved high-torque, low-cogging torque, low-torque ripple, high-efficiency, and 70deg or less of temperature rise at rated operation by the above-mentioned technologies. In this report, we describe the verified results of our DDmotor design and its prototypes.
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