The automotive industry in the research and development cost ratio accounted for high technology coefficient of specialization research and development budget. development and adoption of innovative technologies such as new materials technology, electronics technology, information and communications technology and new production systems is a source of competitive products. because permanent magnets without applying an external magnetic field in the BLDC motor drive system parts for EV can be supplied. it has been used in several areas. permanent magnet in the different kinds of motor parts materials is one of the key components. permanent magnet is a relatively fast rate of technological advances, changes in price is considered the fastest. in this paper, the BLDC motor parts produce by the core making method of casting method moulding analysis. moulding density was measured. As a result, the moulding density is measured 7.2~7.5g/cm2 results were excellent.